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 <linux/vmalloc.h> 17 #include <sound/core.h> 18 #include <sound/control.h> 19 #include <sound/info.h> 20 #include <sound/pcm.h> 21 #include <sound/pcm_params.h> 22 #include <sound/timer.h> 23 #include <sound/minors.h> 24 #include <linux/uio.h> 25 #include <linux/delay.h> 26 27 #include "pcm_local.h" 28 29 #ifdef CONFIG_SND_DEBUG 30 #define CREATE_TRACE_POINTS 31 #include "pcm_param_trace.h" 32 #else 33 #define trace_hw_mask_param_enabled() 0 34 #define trace_hw_interval_param_enabled() 0 35 #define trace_hw_mask_param(substream, type, index, prev, curr) 36 #define trace_hw_interval_param(substream, type, index, prev, curr) 37 #endif 38 39 /* 40 * Compatibility 41 */ 42 43 struct snd_pcm_hw_params_old { 44 unsigned int flags; 45 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 46 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 47 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 48 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 49 unsigned int rmask; 50 unsigned int cmask; 51 unsigned int info; 52 unsigned int msbits; 53 unsigned int rate_num; 54 unsigned int rate_den; 55 snd_pcm_uframes_t fifo_size; 56 unsigned char reserved[64]; 57 }; 58 59 #ifdef CONFIG_SND_SUPPORT_OLD_API 60 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 61 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 62 63 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 64 struct snd_pcm_hw_params_old __user * _oparams); 65 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 66 struct snd_pcm_hw_params_old __user * _oparams); 67 #endif 68 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 69 70 /* 71 * 72 */ 73 74 static DECLARE_RWSEM(snd_pcm_link_rwsem); 75 76 void snd_pcm_group_init(struct snd_pcm_group *group) 77 { 78 spin_lock_init(&group->lock); 79 mutex_init(&group->mutex); 80 INIT_LIST_HEAD(&group->substreams); 81 refcount_set(&group->refs, 1); 82 } 83 84 /* define group lock helpers */ 85 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \ 86 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \ 87 { \ 88 if (nonatomic) \ 89 mutex_ ## mutex_action(&group->mutex); \ 90 else \ 91 spin_ ## action(&group->lock); \ 92 } 93 94 DEFINE_PCM_GROUP_LOCK(lock, lock); 95 DEFINE_PCM_GROUP_LOCK(unlock, unlock); 96 DEFINE_PCM_GROUP_LOCK(lock_irq, lock); 97 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock); 98 99 /** 100 * snd_pcm_stream_lock - Lock the PCM stream 101 * @substream: PCM substream 102 * 103 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 104 * flag of the given substream. This also takes the global link rw lock 105 * (or rw sem), too, for avoiding the race with linked streams. 106 */ 107 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 108 { 109 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic); 110 } 111 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 112 113 /** 114 * snd_pcm_stream_lock - Unlock the PCM stream 115 * @substream: PCM substream 116 * 117 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 118 */ 119 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 120 { 121 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic); 122 } 123 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 124 125 /** 126 * snd_pcm_stream_lock_irq - Lock the PCM stream 127 * @substream: PCM substream 128 * 129 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 130 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 131 * as snd_pcm_stream_lock(). 132 */ 133 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 134 { 135 snd_pcm_group_lock_irq(&substream->self_group, 136 substream->pcm->nonatomic); 137 } 138 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 139 140 /** 141 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 142 * @substream: PCM substream 143 * 144 * This is a counter-part of snd_pcm_stream_lock_irq(). 145 */ 146 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 147 { 148 snd_pcm_group_unlock_irq(&substream->self_group, 149 substream->pcm->nonatomic); 150 } 151 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 152 153 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 154 { 155 unsigned long flags = 0; 156 if (substream->pcm->nonatomic) 157 mutex_lock(&substream->self_group.mutex); 158 else 159 spin_lock_irqsave(&substream->self_group.lock, flags); 160 return flags; 161 } 162 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 163 164 /** 165 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 166 * @substream: PCM substream 167 * @flags: irq flags 168 * 169 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 170 */ 171 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 172 unsigned long flags) 173 { 174 if (substream->pcm->nonatomic) 175 mutex_unlock(&substream->self_group.mutex); 176 else 177 spin_unlock_irqrestore(&substream->self_group.lock, flags); 178 } 179 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 180 181 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 182 { 183 struct snd_pcm *pcm = substream->pcm; 184 struct snd_pcm_str *pstr = substream->pstr; 185 186 memset(info, 0, sizeof(*info)); 187 info->card = pcm->card->number; 188 info->device = pcm->device; 189 info->stream = substream->stream; 190 info->subdevice = substream->number; 191 strlcpy(info->id, pcm->id, sizeof(info->id)); 192 strlcpy(info->name, pcm->name, sizeof(info->name)); 193 info->dev_class = pcm->dev_class; 194 info->dev_subclass = pcm->dev_subclass; 195 info->subdevices_count = pstr->substream_count; 196 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 197 strlcpy(info->subname, substream->name, sizeof(info->subname)); 198 199 return 0; 200 } 201 202 int snd_pcm_info_user(struct snd_pcm_substream *substream, 203 struct snd_pcm_info __user * _info) 204 { 205 struct snd_pcm_info *info; 206 int err; 207 208 info = kmalloc(sizeof(*info), GFP_KERNEL); 209 if (! info) 210 return -ENOMEM; 211 err = snd_pcm_info(substream, info); 212 if (err >= 0) { 213 if (copy_to_user(_info, info, sizeof(*info))) 214 err = -EFAULT; 215 } 216 kfree(info); 217 return err; 218 } 219 220 static bool hw_support_mmap(struct snd_pcm_substream *substream) 221 { 222 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 223 return false; 224 225 if (substream->ops->mmap || 226 (substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV && 227 substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV_UC)) 228 return true; 229 230 return dma_can_mmap(substream->dma_buffer.dev.dev); 231 } 232 233 static int constrain_mask_params(struct snd_pcm_substream *substream, 234 struct snd_pcm_hw_params *params) 235 { 236 struct snd_pcm_hw_constraints *constrs = 237 &substream->runtime->hw_constraints; 238 struct snd_mask *m; 239 unsigned int k; 240 struct snd_mask old_mask; 241 int changed; 242 243 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 244 m = hw_param_mask(params, k); 245 if (snd_mask_empty(m)) 246 return -EINVAL; 247 248 /* This parameter is not requested to change by a caller. */ 249 if (!(params->rmask & (1 << k))) 250 continue; 251 252 if (trace_hw_mask_param_enabled()) 253 old_mask = *m; 254 255 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 256 if (changed < 0) 257 return changed; 258 if (changed == 0) 259 continue; 260 261 /* Set corresponding flag so that the caller gets it. */ 262 trace_hw_mask_param(substream, k, 0, &old_mask, m); 263 params->cmask |= 1 << k; 264 } 265 266 return 0; 267 } 268 269 static int constrain_interval_params(struct snd_pcm_substream *substream, 270 struct snd_pcm_hw_params *params) 271 { 272 struct snd_pcm_hw_constraints *constrs = 273 &substream->runtime->hw_constraints; 274 struct snd_interval *i; 275 unsigned int k; 276 struct snd_interval old_interval; 277 int changed; 278 279 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 280 i = hw_param_interval(params, k); 281 if (snd_interval_empty(i)) 282 return -EINVAL; 283 284 /* This parameter is not requested to change by a caller. */ 285 if (!(params->rmask & (1 << k))) 286 continue; 287 288 if (trace_hw_interval_param_enabled()) 289 old_interval = *i; 290 291 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 292 if (changed < 0) 293 return changed; 294 if (changed == 0) 295 continue; 296 297 /* Set corresponding flag so that the caller gets it. */ 298 trace_hw_interval_param(substream, k, 0, &old_interval, i); 299 params->cmask |= 1 << k; 300 } 301 302 return 0; 303 } 304 305 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 306 struct snd_pcm_hw_params *params) 307 { 308 struct snd_pcm_hw_constraints *constrs = 309 &substream->runtime->hw_constraints; 310 unsigned int k; 311 unsigned int *rstamps; 312 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 313 unsigned int stamp; 314 struct snd_pcm_hw_rule *r; 315 unsigned int d; 316 struct snd_mask old_mask; 317 struct snd_interval old_interval; 318 bool again; 319 int changed, err = 0; 320 321 /* 322 * Each application of rule has own sequence number. 323 * 324 * Each member of 'rstamps' array represents the sequence number of 325 * recent application of corresponding rule. 326 */ 327 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 328 if (!rstamps) 329 return -ENOMEM; 330 331 /* 332 * Each member of 'vstamps' array represents the sequence number of 333 * recent application of rule in which corresponding parameters were 334 * changed. 335 * 336 * In initial state, elements corresponding to parameters requested by 337 * a caller is 1. For unrequested parameters, corresponding members 338 * have 0 so that the parameters are never changed anymore. 339 */ 340 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 341 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 342 343 /* Due to the above design, actual sequence number starts at 2. */ 344 stamp = 2; 345 retry: 346 /* Apply all rules in order. */ 347 again = false; 348 for (k = 0; k < constrs->rules_num; k++) { 349 r = &constrs->rules[k]; 350 351 /* 352 * Check condition bits of this rule. When the rule has 353 * some condition bits, parameter without the bits is 354 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 355 * is an example of the condition bits. 356 */ 357 if (r->cond && !(r->cond & params->flags)) 358 continue; 359 360 /* 361 * The 'deps' array includes maximum three dependencies 362 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 363 * member of this array is a sentinel and should be 364 * negative value. 365 * 366 * This rule should be processed in this time when dependent 367 * parameters were changed at former applications of the other 368 * rules. 369 */ 370 for (d = 0; r->deps[d] >= 0; d++) { 371 if (vstamps[r->deps[d]] > rstamps[k]) 372 break; 373 } 374 if (r->deps[d] < 0) 375 continue; 376 377 if (trace_hw_mask_param_enabled()) { 378 if (hw_is_mask(r->var)) 379 old_mask = *hw_param_mask(params, r->var); 380 } 381 if (trace_hw_interval_param_enabled()) { 382 if (hw_is_interval(r->var)) 383 old_interval = *hw_param_interval(params, r->var); 384 } 385 386 changed = r->func(params, r); 387 if (changed < 0) { 388 err = changed; 389 goto out; 390 } 391 392 /* 393 * When the parameter is changed, notify it to the caller 394 * by corresponding returned bit, then preparing for next 395 * iteration. 396 */ 397 if (changed && r->var >= 0) { 398 if (hw_is_mask(r->var)) { 399 trace_hw_mask_param(substream, r->var, 400 k + 1, &old_mask, 401 hw_param_mask(params, r->var)); 402 } 403 if (hw_is_interval(r->var)) { 404 trace_hw_interval_param(substream, r->var, 405 k + 1, &old_interval, 406 hw_param_interval(params, r->var)); 407 } 408 409 params->cmask |= (1 << r->var); 410 vstamps[r->var] = stamp; 411 again = true; 412 } 413 414 rstamps[k] = stamp++; 415 } 416 417 /* Iterate to evaluate all rules till no parameters are changed. */ 418 if (again) 419 goto retry; 420 421 out: 422 kfree(rstamps); 423 return err; 424 } 425 426 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 427 struct snd_pcm_hw_params *params) 428 { 429 const struct snd_interval *i; 430 const struct snd_mask *m; 431 int err; 432 433 if (!params->msbits) { 434 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 435 if (snd_interval_single(i)) 436 params->msbits = snd_interval_value(i); 437 } 438 439 if (!params->rate_den) { 440 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 441 if (snd_interval_single(i)) { 442 params->rate_num = snd_interval_value(i); 443 params->rate_den = 1; 444 } 445 } 446 447 if (!params->fifo_size) { 448 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 449 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 450 if (snd_mask_single(m) && snd_interval_single(i)) { 451 err = substream->ops->ioctl(substream, 452 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 453 if (err < 0) 454 return err; 455 } 456 } 457 458 if (!params->info) { 459 params->info = substream->runtime->hw.info; 460 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 461 SNDRV_PCM_INFO_DRAIN_TRIGGER); 462 if (!hw_support_mmap(substream)) 463 params->info &= ~(SNDRV_PCM_INFO_MMAP | 464 SNDRV_PCM_INFO_MMAP_VALID); 465 } 466 467 return 0; 468 } 469 470 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 471 struct snd_pcm_hw_params *params) 472 { 473 int err; 474 475 params->info = 0; 476 params->fifo_size = 0; 477 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 478 params->msbits = 0; 479 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 480 params->rate_num = 0; 481 params->rate_den = 0; 482 } 483 484 err = constrain_mask_params(substream, params); 485 if (err < 0) 486 return err; 487 488 err = constrain_interval_params(substream, params); 489 if (err < 0) 490 return err; 491 492 err = constrain_params_by_rules(substream, params); 493 if (err < 0) 494 return err; 495 496 params->rmask = 0; 497 498 return 0; 499 } 500 EXPORT_SYMBOL(snd_pcm_hw_refine); 501 502 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 503 struct snd_pcm_hw_params __user * _params) 504 { 505 struct snd_pcm_hw_params *params; 506 int err; 507 508 params = memdup_user(_params, sizeof(*params)); 509 if (IS_ERR(params)) 510 return PTR_ERR(params); 511 512 err = snd_pcm_hw_refine(substream, params); 513 if (err < 0) 514 goto end; 515 516 err = fixup_unreferenced_params(substream, params); 517 if (err < 0) 518 goto end; 519 520 if (copy_to_user(_params, params, sizeof(*params))) 521 err = -EFAULT; 522 end: 523 kfree(params); 524 return err; 525 } 526 527 static int period_to_usecs(struct snd_pcm_runtime *runtime) 528 { 529 int usecs; 530 531 if (! runtime->rate) 532 return -1; /* invalid */ 533 534 /* take 75% of period time as the deadline */ 535 usecs = (750000 / runtime->rate) * runtime->period_size; 536 usecs += ((750000 % runtime->rate) * runtime->period_size) / 537 runtime->rate; 538 539 return usecs; 540 } 541 542 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 543 { 544 snd_pcm_stream_lock_irq(substream); 545 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 546 substream->runtime->status->state = state; 547 snd_pcm_stream_unlock_irq(substream); 548 } 549 550 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 551 int event) 552 { 553 #ifdef CONFIG_SND_PCM_TIMER 554 if (substream->timer) 555 snd_timer_notify(substream->timer, event, 556 &substream->runtime->trigger_tstamp); 557 #endif 558 } 559 560 /** 561 * snd_pcm_hw_param_choose - choose a configuration defined by @params 562 * @pcm: PCM instance 563 * @params: the hw_params instance 564 * 565 * Choose one configuration from configuration space defined by @params. 566 * The configuration chosen is that obtained fixing in this order: 567 * first access, first format, first subformat, min channels, 568 * min rate, min period time, max buffer size, min tick time 569 * 570 * Return: Zero if successful, or a negative error code on failure. 571 */ 572 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 573 struct snd_pcm_hw_params *params) 574 { 575 static const int vars[] = { 576 SNDRV_PCM_HW_PARAM_ACCESS, 577 SNDRV_PCM_HW_PARAM_FORMAT, 578 SNDRV_PCM_HW_PARAM_SUBFORMAT, 579 SNDRV_PCM_HW_PARAM_CHANNELS, 580 SNDRV_PCM_HW_PARAM_RATE, 581 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 582 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 583 SNDRV_PCM_HW_PARAM_TICK_TIME, 584 -1 585 }; 586 const int *v; 587 struct snd_mask old_mask; 588 struct snd_interval old_interval; 589 int changed; 590 591 for (v = vars; *v != -1; v++) { 592 /* Keep old parameter to trace. */ 593 if (trace_hw_mask_param_enabled()) { 594 if (hw_is_mask(*v)) 595 old_mask = *hw_param_mask(params, *v); 596 } 597 if (trace_hw_interval_param_enabled()) { 598 if (hw_is_interval(*v)) 599 old_interval = *hw_param_interval(params, *v); 600 } 601 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 602 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 603 else 604 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 605 if (changed < 0) 606 return changed; 607 if (changed == 0) 608 continue; 609 610 /* Trace the changed parameter. */ 611 if (hw_is_mask(*v)) { 612 trace_hw_mask_param(pcm, *v, 0, &old_mask, 613 hw_param_mask(params, *v)); 614 } 615 if (hw_is_interval(*v)) { 616 trace_hw_interval_param(pcm, *v, 0, &old_interval, 617 hw_param_interval(params, *v)); 618 } 619 } 620 621 return 0; 622 } 623 624 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 625 struct snd_pcm_hw_params *params) 626 { 627 struct snd_pcm_runtime *runtime; 628 int err, usecs; 629 unsigned int bits; 630 snd_pcm_uframes_t frames; 631 632 if (PCM_RUNTIME_CHECK(substream)) 633 return -ENXIO; 634 runtime = substream->runtime; 635 snd_pcm_stream_lock_irq(substream); 636 switch (runtime->status->state) { 637 case SNDRV_PCM_STATE_OPEN: 638 case SNDRV_PCM_STATE_SETUP: 639 case SNDRV_PCM_STATE_PREPARED: 640 break; 641 default: 642 snd_pcm_stream_unlock_irq(substream); 643 return -EBADFD; 644 } 645 snd_pcm_stream_unlock_irq(substream); 646 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 647 if (!substream->oss.oss) 648 #endif 649 if (atomic_read(&substream->mmap_count)) 650 return -EBADFD; 651 652 params->rmask = ~0U; 653 err = snd_pcm_hw_refine(substream, params); 654 if (err < 0) 655 goto _error; 656 657 err = snd_pcm_hw_params_choose(substream, params); 658 if (err < 0) 659 goto _error; 660 661 err = fixup_unreferenced_params(substream, params); 662 if (err < 0) 663 goto _error; 664 665 if (substream->ops->hw_params != NULL) { 666 err = substream->ops->hw_params(substream, params); 667 if (err < 0) 668 goto _error; 669 } 670 671 runtime->access = params_access(params); 672 runtime->format = params_format(params); 673 runtime->subformat = params_subformat(params); 674 runtime->channels = params_channels(params); 675 runtime->rate = params_rate(params); 676 runtime->period_size = params_period_size(params); 677 runtime->periods = params_periods(params); 678 runtime->buffer_size = params_buffer_size(params); 679 runtime->info = params->info; 680 runtime->rate_num = params->rate_num; 681 runtime->rate_den = params->rate_den; 682 runtime->no_period_wakeup = 683 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 684 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 685 686 bits = snd_pcm_format_physical_width(runtime->format); 687 runtime->sample_bits = bits; 688 bits *= runtime->channels; 689 runtime->frame_bits = bits; 690 frames = 1; 691 while (bits % 8 != 0) { 692 bits *= 2; 693 frames *= 2; 694 } 695 runtime->byte_align = bits / 8; 696 runtime->min_align = frames; 697 698 /* Default sw params */ 699 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 700 runtime->period_step = 1; 701 runtime->control->avail_min = runtime->period_size; 702 runtime->start_threshold = 1; 703 runtime->stop_threshold = runtime->buffer_size; 704 runtime->silence_threshold = 0; 705 runtime->silence_size = 0; 706 runtime->boundary = runtime->buffer_size; 707 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 708 runtime->boundary *= 2; 709 710 snd_pcm_timer_resolution_change(substream); 711 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 712 713 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 714 pm_qos_remove_request(&substream->latency_pm_qos_req); 715 if ((usecs = period_to_usecs(runtime)) >= 0) 716 pm_qos_add_request(&substream->latency_pm_qos_req, 717 PM_QOS_CPU_DMA_LATENCY, usecs); 718 return 0; 719 _error: 720 /* hardware might be unusable from this time, 721 so we force application to retry to set 722 the correct hardware parameter settings */ 723 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 724 if (substream->ops->hw_free != NULL) 725 substream->ops->hw_free(substream); 726 return err; 727 } 728 729 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 730 struct snd_pcm_hw_params __user * _params) 731 { 732 struct snd_pcm_hw_params *params; 733 int err; 734 735 params = memdup_user(_params, sizeof(*params)); 736 if (IS_ERR(params)) 737 return PTR_ERR(params); 738 739 err = snd_pcm_hw_params(substream, params); 740 if (err < 0) 741 goto end; 742 743 if (copy_to_user(_params, params, sizeof(*params))) 744 err = -EFAULT; 745 end: 746 kfree(params); 747 return err; 748 } 749 750 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 751 { 752 struct snd_pcm_runtime *runtime; 753 int result = 0; 754 755 if (PCM_RUNTIME_CHECK(substream)) 756 return -ENXIO; 757 runtime = substream->runtime; 758 snd_pcm_stream_lock_irq(substream); 759 switch (runtime->status->state) { 760 case SNDRV_PCM_STATE_SETUP: 761 case SNDRV_PCM_STATE_PREPARED: 762 break; 763 default: 764 snd_pcm_stream_unlock_irq(substream); 765 return -EBADFD; 766 } 767 snd_pcm_stream_unlock_irq(substream); 768 if (atomic_read(&substream->mmap_count)) 769 return -EBADFD; 770 if (substream->ops->hw_free) 771 result = substream->ops->hw_free(substream); 772 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 773 pm_qos_remove_request(&substream->latency_pm_qos_req); 774 return result; 775 } 776 777 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 778 struct snd_pcm_sw_params *params) 779 { 780 struct snd_pcm_runtime *runtime; 781 int err; 782 783 if (PCM_RUNTIME_CHECK(substream)) 784 return -ENXIO; 785 runtime = substream->runtime; 786 snd_pcm_stream_lock_irq(substream); 787 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 788 snd_pcm_stream_unlock_irq(substream); 789 return -EBADFD; 790 } 791 snd_pcm_stream_unlock_irq(substream); 792 793 if (params->tstamp_mode < 0 || 794 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 795 return -EINVAL; 796 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 797 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 798 return -EINVAL; 799 if (params->avail_min == 0) 800 return -EINVAL; 801 if (params->silence_size >= runtime->boundary) { 802 if (params->silence_threshold != 0) 803 return -EINVAL; 804 } else { 805 if (params->silence_size > params->silence_threshold) 806 return -EINVAL; 807 if (params->silence_threshold > runtime->buffer_size) 808 return -EINVAL; 809 } 810 err = 0; 811 snd_pcm_stream_lock_irq(substream); 812 runtime->tstamp_mode = params->tstamp_mode; 813 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 814 runtime->tstamp_type = params->tstamp_type; 815 runtime->period_step = params->period_step; 816 runtime->control->avail_min = params->avail_min; 817 runtime->start_threshold = params->start_threshold; 818 runtime->stop_threshold = params->stop_threshold; 819 runtime->silence_threshold = params->silence_threshold; 820 runtime->silence_size = params->silence_size; 821 params->boundary = runtime->boundary; 822 if (snd_pcm_running(substream)) { 823 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 824 runtime->silence_size > 0) 825 snd_pcm_playback_silence(substream, ULONG_MAX); 826 err = snd_pcm_update_state(substream, runtime); 827 } 828 snd_pcm_stream_unlock_irq(substream); 829 return err; 830 } 831 832 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 833 struct snd_pcm_sw_params __user * _params) 834 { 835 struct snd_pcm_sw_params params; 836 int err; 837 if (copy_from_user(¶ms, _params, sizeof(params))) 838 return -EFAULT; 839 err = snd_pcm_sw_params(substream, ¶ms); 840 if (copy_to_user(_params, ¶ms, sizeof(params))) 841 return -EFAULT; 842 return err; 843 } 844 845 static inline snd_pcm_uframes_t 846 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 847 { 848 snd_pcm_uframes_t delay; 849 850 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 851 delay = snd_pcm_playback_hw_avail(substream->runtime); 852 else 853 delay = snd_pcm_capture_avail(substream->runtime); 854 return delay + substream->runtime->delay; 855 } 856 857 int snd_pcm_status(struct snd_pcm_substream *substream, 858 struct snd_pcm_status *status) 859 { 860 struct snd_pcm_runtime *runtime = substream->runtime; 861 862 snd_pcm_stream_lock_irq(substream); 863 864 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 865 &runtime->audio_tstamp_config); 866 867 /* backwards compatible behavior */ 868 if (runtime->audio_tstamp_config.type_requested == 869 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 870 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 871 runtime->audio_tstamp_config.type_requested = 872 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 873 else 874 runtime->audio_tstamp_config.type_requested = 875 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 876 runtime->audio_tstamp_report.valid = 0; 877 } else 878 runtime->audio_tstamp_report.valid = 1; 879 880 status->state = runtime->status->state; 881 status->suspended_state = runtime->status->suspended_state; 882 if (status->state == SNDRV_PCM_STATE_OPEN) 883 goto _end; 884 status->trigger_tstamp = runtime->trigger_tstamp; 885 if (snd_pcm_running(substream)) { 886 snd_pcm_update_hw_ptr(substream); 887 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 888 status->tstamp = runtime->status->tstamp; 889 status->driver_tstamp = runtime->driver_tstamp; 890 status->audio_tstamp = 891 runtime->status->audio_tstamp; 892 if (runtime->audio_tstamp_report.valid == 1) 893 /* backwards compatibility, no report provided in COMPAT mode */ 894 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 895 &status->audio_tstamp_accuracy, 896 &runtime->audio_tstamp_report); 897 898 goto _tstamp_end; 899 } 900 } else { 901 /* get tstamp only in fallback mode and only if enabled */ 902 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 903 snd_pcm_gettime(runtime, &status->tstamp); 904 } 905 _tstamp_end: 906 status->appl_ptr = runtime->control->appl_ptr; 907 status->hw_ptr = runtime->status->hw_ptr; 908 status->avail = snd_pcm_avail(substream); 909 status->delay = snd_pcm_running(substream) ? 910 snd_pcm_calc_delay(substream) : 0; 911 status->avail_max = runtime->avail_max; 912 status->overrange = runtime->overrange; 913 runtime->avail_max = 0; 914 runtime->overrange = 0; 915 _end: 916 snd_pcm_stream_unlock_irq(substream); 917 return 0; 918 } 919 920 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 921 struct snd_pcm_status __user * _status, 922 bool ext) 923 { 924 struct snd_pcm_status status; 925 int res; 926 927 memset(&status, 0, sizeof(status)); 928 /* 929 * with extension, parameters are read/write, 930 * get audio_tstamp_data from user, 931 * ignore rest of status structure 932 */ 933 if (ext && get_user(status.audio_tstamp_data, 934 (u32 __user *)(&_status->audio_tstamp_data))) 935 return -EFAULT; 936 res = snd_pcm_status(substream, &status); 937 if (res < 0) 938 return res; 939 if (copy_to_user(_status, &status, sizeof(status))) 940 return -EFAULT; 941 return 0; 942 } 943 944 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 945 struct snd_pcm_channel_info * info) 946 { 947 struct snd_pcm_runtime *runtime; 948 unsigned int channel; 949 950 channel = info->channel; 951 runtime = substream->runtime; 952 snd_pcm_stream_lock_irq(substream); 953 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 954 snd_pcm_stream_unlock_irq(substream); 955 return -EBADFD; 956 } 957 snd_pcm_stream_unlock_irq(substream); 958 if (channel >= runtime->channels) 959 return -EINVAL; 960 memset(info, 0, sizeof(*info)); 961 info->channel = channel; 962 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 963 } 964 965 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 966 struct snd_pcm_channel_info __user * _info) 967 { 968 struct snd_pcm_channel_info info; 969 int res; 970 971 if (copy_from_user(&info, _info, sizeof(info))) 972 return -EFAULT; 973 res = snd_pcm_channel_info(substream, &info); 974 if (res < 0) 975 return res; 976 if (copy_to_user(_info, &info, sizeof(info))) 977 return -EFAULT; 978 return 0; 979 } 980 981 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 982 { 983 struct snd_pcm_runtime *runtime = substream->runtime; 984 if (runtime->trigger_master == NULL) 985 return; 986 if (runtime->trigger_master == substream) { 987 if (!runtime->trigger_tstamp_latched) 988 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 989 } else { 990 snd_pcm_trigger_tstamp(runtime->trigger_master); 991 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 992 } 993 runtime->trigger_master = NULL; 994 } 995 996 struct action_ops { 997 int (*pre_action)(struct snd_pcm_substream *substream, int state); 998 int (*do_action)(struct snd_pcm_substream *substream, int state); 999 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1000 void (*post_action)(struct snd_pcm_substream *substream, int state); 1001 }; 1002 1003 /* 1004 * this functions is core for handling of linked stream 1005 * Note: the stream state might be changed also on failure 1006 * Note2: call with calling stream lock + link lock 1007 */ 1008 static int snd_pcm_action_group(const struct action_ops *ops, 1009 struct snd_pcm_substream *substream, 1010 int state, int do_lock) 1011 { 1012 struct snd_pcm_substream *s = NULL; 1013 struct snd_pcm_substream *s1; 1014 int res = 0, depth = 1; 1015 1016 snd_pcm_group_for_each_entry(s, substream) { 1017 if (do_lock && s != substream) { 1018 if (s->pcm->nonatomic) 1019 mutex_lock_nested(&s->self_group.mutex, depth); 1020 else 1021 spin_lock_nested(&s->self_group.lock, depth); 1022 depth++; 1023 } 1024 res = ops->pre_action(s, state); 1025 if (res < 0) 1026 goto _unlock; 1027 } 1028 snd_pcm_group_for_each_entry(s, substream) { 1029 res = ops->do_action(s, state); 1030 if (res < 0) { 1031 if (ops->undo_action) { 1032 snd_pcm_group_for_each_entry(s1, substream) { 1033 if (s1 == s) /* failed stream */ 1034 break; 1035 ops->undo_action(s1, state); 1036 } 1037 } 1038 s = NULL; /* unlock all */ 1039 goto _unlock; 1040 } 1041 } 1042 snd_pcm_group_for_each_entry(s, substream) { 1043 ops->post_action(s, state); 1044 } 1045 _unlock: 1046 if (do_lock) { 1047 /* unlock streams */ 1048 snd_pcm_group_for_each_entry(s1, substream) { 1049 if (s1 != substream) { 1050 if (s1->pcm->nonatomic) 1051 mutex_unlock(&s1->self_group.mutex); 1052 else 1053 spin_unlock(&s1->self_group.lock); 1054 } 1055 if (s1 == s) /* end */ 1056 break; 1057 } 1058 } 1059 return res; 1060 } 1061 1062 /* 1063 * Note: call with stream lock 1064 */ 1065 static int snd_pcm_action_single(const struct action_ops *ops, 1066 struct snd_pcm_substream *substream, 1067 int state) 1068 { 1069 int res; 1070 1071 res = ops->pre_action(substream, state); 1072 if (res < 0) 1073 return res; 1074 res = ops->do_action(substream, state); 1075 if (res == 0) 1076 ops->post_action(substream, state); 1077 else if (ops->undo_action) 1078 ops->undo_action(substream, state); 1079 return res; 1080 } 1081 1082 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1083 struct snd_pcm_group *new_group) 1084 { 1085 substream->group = new_group; 1086 list_move(&substream->link_list, &new_group->substreams); 1087 } 1088 1089 /* 1090 * Unref and unlock the group, but keep the stream lock; 1091 * when the group becomes empty and no longer referred, destroy itself 1092 */ 1093 static void snd_pcm_group_unref(struct snd_pcm_group *group, 1094 struct snd_pcm_substream *substream) 1095 { 1096 bool do_free; 1097 1098 if (!group) 1099 return; 1100 do_free = refcount_dec_and_test(&group->refs); 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 set_current_state(TASK_INTERRUPTIBLE); 1878 add_wait_queue(&to_check->sleep, &wait); 1879 snd_pcm_stream_unlock_irq(substream); 1880 if (runtime->no_period_wakeup) 1881 tout = MAX_SCHEDULE_TIMEOUT; 1882 else { 1883 tout = 10; 1884 if (runtime->rate) { 1885 long t = runtime->period_size * 2 / runtime->rate; 1886 tout = max(t, tout); 1887 } 1888 tout = msecs_to_jiffies(tout * 1000); 1889 } 1890 tout = schedule_timeout(tout); 1891 1892 snd_pcm_stream_lock_irq(substream); 1893 group = snd_pcm_stream_group_ref(substream); 1894 snd_pcm_group_for_each_entry(s, substream) { 1895 if (s->runtime == to_check) { 1896 remove_wait_queue(&to_check->sleep, &wait); 1897 break; 1898 } 1899 } 1900 snd_pcm_group_unref(group, substream); 1901 1902 if (card->shutdown) { 1903 result = -ENODEV; 1904 break; 1905 } 1906 if (tout == 0) { 1907 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1908 result = -ESTRPIPE; 1909 else { 1910 dev_dbg(substream->pcm->card->dev, 1911 "playback drain error (DMA or IRQ trouble?)\n"); 1912 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1913 result = -EIO; 1914 } 1915 break; 1916 } 1917 } 1918 1919 unlock: 1920 snd_pcm_stream_unlock_irq(substream); 1921 1922 return result; 1923 } 1924 1925 /* 1926 * drop ioctl 1927 * 1928 * Immediately put all linked substreams into SETUP state. 1929 */ 1930 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1931 { 1932 struct snd_pcm_runtime *runtime; 1933 int result = 0; 1934 1935 if (PCM_RUNTIME_CHECK(substream)) 1936 return -ENXIO; 1937 runtime = substream->runtime; 1938 1939 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1940 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1941 return -EBADFD; 1942 1943 snd_pcm_stream_lock_irq(substream); 1944 /* resume pause */ 1945 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1946 snd_pcm_pause(substream, 0); 1947 1948 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1949 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1950 snd_pcm_stream_unlock_irq(substream); 1951 1952 return result; 1953 } 1954 1955 1956 static bool is_pcm_file(struct file *file) 1957 { 1958 struct inode *inode = file_inode(file); 1959 struct snd_pcm *pcm; 1960 unsigned int minor; 1961 1962 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1963 return false; 1964 minor = iminor(inode); 1965 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 1966 if (!pcm) 1967 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1968 if (!pcm) 1969 return false; 1970 snd_card_unref(pcm->card); 1971 return true; 1972 } 1973 1974 /* 1975 * PCM link handling 1976 */ 1977 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1978 { 1979 int res = 0; 1980 struct snd_pcm_file *pcm_file; 1981 struct snd_pcm_substream *substream1; 1982 struct snd_pcm_group *group, *target_group; 1983 bool nonatomic = substream->pcm->nonatomic; 1984 struct fd f = fdget(fd); 1985 1986 if (!f.file) 1987 return -EBADFD; 1988 if (!is_pcm_file(f.file)) { 1989 res = -EBADFD; 1990 goto _badf; 1991 } 1992 pcm_file = f.file->private_data; 1993 substream1 = pcm_file->substream; 1994 group = kzalloc(sizeof(*group), GFP_KERNEL); 1995 if (!group) { 1996 res = -ENOMEM; 1997 goto _nolock; 1998 } 1999 snd_pcm_group_init(group); 2000 2001 down_write(&snd_pcm_link_rwsem); 2002 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 2003 substream->runtime->status->state != substream1->runtime->status->state || 2004 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2005 res = -EBADFD; 2006 goto _end; 2007 } 2008 if (snd_pcm_stream_linked(substream1)) { 2009 res = -EALREADY; 2010 goto _end; 2011 } 2012 2013 snd_pcm_stream_lock_irq(substream); 2014 if (!snd_pcm_stream_linked(substream)) { 2015 snd_pcm_group_assign(substream, group); 2016 group = NULL; /* assigned, don't free this one below */ 2017 } 2018 target_group = substream->group; 2019 snd_pcm_stream_unlock_irq(substream); 2020 2021 snd_pcm_group_lock_irq(target_group, nonatomic); 2022 snd_pcm_stream_lock(substream1); 2023 snd_pcm_group_assign(substream1, target_group); 2024 refcount_inc(&target_group->refs); 2025 snd_pcm_stream_unlock(substream1); 2026 snd_pcm_group_unlock_irq(target_group, nonatomic); 2027 _end: 2028 up_write(&snd_pcm_link_rwsem); 2029 _nolock: 2030 kfree(group); 2031 _badf: 2032 fdput(f); 2033 return res; 2034 } 2035 2036 static void relink_to_local(struct snd_pcm_substream *substream) 2037 { 2038 snd_pcm_stream_lock(substream); 2039 snd_pcm_group_assign(substream, &substream->self_group); 2040 snd_pcm_stream_unlock(substream); 2041 } 2042 2043 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2044 { 2045 struct snd_pcm_group *group; 2046 bool nonatomic = substream->pcm->nonatomic; 2047 bool do_free = false; 2048 int res = 0; 2049 2050 down_write(&snd_pcm_link_rwsem); 2051 2052 if (!snd_pcm_stream_linked(substream)) { 2053 res = -EALREADY; 2054 goto _end; 2055 } 2056 2057 group = substream->group; 2058 snd_pcm_group_lock_irq(group, nonatomic); 2059 2060 relink_to_local(substream); 2061 refcount_dec(&group->refs); 2062 2063 /* detach the last stream, too */ 2064 if (list_is_singular(&group->substreams)) { 2065 relink_to_local(list_first_entry(&group->substreams, 2066 struct snd_pcm_substream, 2067 link_list)); 2068 do_free = refcount_dec_and_test(&group->refs); 2069 } 2070 2071 snd_pcm_group_unlock_irq(group, nonatomic); 2072 if (do_free) 2073 kfree(group); 2074 2075 _end: 2076 up_write(&snd_pcm_link_rwsem); 2077 return res; 2078 } 2079 2080 /* 2081 * hw configurator 2082 */ 2083 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2084 struct snd_pcm_hw_rule *rule) 2085 { 2086 struct snd_interval t; 2087 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2088 hw_param_interval_c(params, rule->deps[1]), &t); 2089 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2090 } 2091 2092 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2093 struct snd_pcm_hw_rule *rule) 2094 { 2095 struct snd_interval t; 2096 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2097 hw_param_interval_c(params, rule->deps[1]), &t); 2098 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2099 } 2100 2101 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2102 struct snd_pcm_hw_rule *rule) 2103 { 2104 struct snd_interval t; 2105 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2106 hw_param_interval_c(params, rule->deps[1]), 2107 (unsigned long) rule->private, &t); 2108 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2109 } 2110 2111 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2112 struct snd_pcm_hw_rule *rule) 2113 { 2114 struct snd_interval t; 2115 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2116 (unsigned long) rule->private, 2117 hw_param_interval_c(params, rule->deps[1]), &t); 2118 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2119 } 2120 2121 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2122 struct snd_pcm_hw_rule *rule) 2123 { 2124 unsigned int k; 2125 const struct snd_interval *i = 2126 hw_param_interval_c(params, rule->deps[0]); 2127 struct snd_mask m; 2128 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2129 snd_mask_any(&m); 2130 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2131 int bits; 2132 if (! snd_mask_test(mask, k)) 2133 continue; 2134 bits = snd_pcm_format_physical_width(k); 2135 if (bits <= 0) 2136 continue; /* ignore invalid formats */ 2137 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2138 snd_mask_reset(&m, k); 2139 } 2140 return snd_mask_refine(mask, &m); 2141 } 2142 2143 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2144 struct snd_pcm_hw_rule *rule) 2145 { 2146 struct snd_interval t; 2147 unsigned int k; 2148 t.min = UINT_MAX; 2149 t.max = 0; 2150 t.openmin = 0; 2151 t.openmax = 0; 2152 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2153 int bits; 2154 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2155 continue; 2156 bits = snd_pcm_format_physical_width(k); 2157 if (bits <= 0) 2158 continue; /* ignore invalid formats */ 2159 if (t.min > (unsigned)bits) 2160 t.min = bits; 2161 if (t.max < (unsigned)bits) 2162 t.max = bits; 2163 } 2164 t.integer = 1; 2165 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2166 } 2167 2168 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2169 #error "Change this table" 2170 #endif 2171 2172 static const unsigned int rates[] = { 2173 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2174 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000 2175 }; 2176 2177 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2178 .count = ARRAY_SIZE(rates), 2179 .list = rates, 2180 }; 2181 2182 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2183 struct snd_pcm_hw_rule *rule) 2184 { 2185 struct snd_pcm_hardware *hw = rule->private; 2186 return snd_interval_list(hw_param_interval(params, rule->var), 2187 snd_pcm_known_rates.count, 2188 snd_pcm_known_rates.list, hw->rates); 2189 } 2190 2191 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2192 struct snd_pcm_hw_rule *rule) 2193 { 2194 struct snd_interval t; 2195 struct snd_pcm_substream *substream = rule->private; 2196 t.min = 0; 2197 t.max = substream->buffer_bytes_max; 2198 t.openmin = 0; 2199 t.openmax = 0; 2200 t.integer = 1; 2201 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2202 } 2203 2204 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2205 { 2206 struct snd_pcm_runtime *runtime = substream->runtime; 2207 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2208 int k, err; 2209 2210 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2211 snd_mask_any(constrs_mask(constrs, k)); 2212 } 2213 2214 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2215 snd_interval_any(constrs_interval(constrs, k)); 2216 } 2217 2218 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2219 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2220 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2221 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2222 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2223 2224 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2225 snd_pcm_hw_rule_format, NULL, 2226 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2227 if (err < 0) 2228 return err; 2229 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2230 snd_pcm_hw_rule_sample_bits, NULL, 2231 SNDRV_PCM_HW_PARAM_FORMAT, 2232 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2233 if (err < 0) 2234 return err; 2235 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2236 snd_pcm_hw_rule_div, NULL, 2237 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2238 if (err < 0) 2239 return err; 2240 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2241 snd_pcm_hw_rule_mul, NULL, 2242 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2243 if (err < 0) 2244 return err; 2245 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2246 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2247 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2248 if (err < 0) 2249 return err; 2250 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2251 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2252 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2253 if (err < 0) 2254 return err; 2255 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2256 snd_pcm_hw_rule_div, NULL, 2257 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2258 if (err < 0) 2259 return err; 2260 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2261 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2262 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2263 if (err < 0) 2264 return err; 2265 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2266 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2267 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2268 if (err < 0) 2269 return err; 2270 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2271 snd_pcm_hw_rule_div, NULL, 2272 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2273 if (err < 0) 2274 return err; 2275 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2276 snd_pcm_hw_rule_div, NULL, 2277 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2278 if (err < 0) 2279 return err; 2280 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2281 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2282 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2283 if (err < 0) 2284 return err; 2285 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2286 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2287 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2288 if (err < 0) 2289 return err; 2290 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2291 snd_pcm_hw_rule_mul, NULL, 2292 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2293 if (err < 0) 2294 return err; 2295 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2296 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2297 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2298 if (err < 0) 2299 return err; 2300 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2301 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2302 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2303 if (err < 0) 2304 return err; 2305 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2306 snd_pcm_hw_rule_muldivk, (void*) 8, 2307 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2308 if (err < 0) 2309 return err; 2310 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2311 snd_pcm_hw_rule_muldivk, (void*) 8, 2312 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2313 if (err < 0) 2314 return err; 2315 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2316 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2317 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2318 if (err < 0) 2319 return err; 2320 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2321 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2322 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2323 if (err < 0) 2324 return err; 2325 return 0; 2326 } 2327 2328 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2329 { 2330 struct snd_pcm_runtime *runtime = substream->runtime; 2331 struct snd_pcm_hardware *hw = &runtime->hw; 2332 int err; 2333 unsigned int mask = 0; 2334 2335 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2336 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2337 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2338 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2339 if (hw_support_mmap(substream)) { 2340 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2341 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2342 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2343 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2344 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2345 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2346 } 2347 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2348 if (err < 0) 2349 return err; 2350 2351 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2352 if (err < 0) 2353 return err; 2354 2355 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2356 if (err < 0) 2357 return err; 2358 2359 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2360 hw->channels_min, hw->channels_max); 2361 if (err < 0) 2362 return err; 2363 2364 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2365 hw->rate_min, hw->rate_max); 2366 if (err < 0) 2367 return err; 2368 2369 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2370 hw->period_bytes_min, hw->period_bytes_max); 2371 if (err < 0) 2372 return err; 2373 2374 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2375 hw->periods_min, hw->periods_max); 2376 if (err < 0) 2377 return err; 2378 2379 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2380 hw->period_bytes_min, hw->buffer_bytes_max); 2381 if (err < 0) 2382 return err; 2383 2384 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2385 snd_pcm_hw_rule_buffer_bytes_max, substream, 2386 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2387 if (err < 0) 2388 return err; 2389 2390 /* FIXME: remove */ 2391 if (runtime->dma_bytes) { 2392 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2393 if (err < 0) 2394 return err; 2395 } 2396 2397 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2398 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2399 snd_pcm_hw_rule_rate, hw, 2400 SNDRV_PCM_HW_PARAM_RATE, -1); 2401 if (err < 0) 2402 return err; 2403 } 2404 2405 /* FIXME: this belong to lowlevel */ 2406 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2407 2408 return 0; 2409 } 2410 2411 static void pcm_release_private(struct snd_pcm_substream *substream) 2412 { 2413 if (snd_pcm_stream_linked(substream)) 2414 snd_pcm_unlink(substream); 2415 } 2416 2417 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2418 { 2419 substream->ref_count--; 2420 if (substream->ref_count > 0) 2421 return; 2422 2423 snd_pcm_drop(substream); 2424 if (substream->hw_opened) { 2425 if (substream->ops->hw_free && 2426 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2427 substream->ops->hw_free(substream); 2428 substream->ops->close(substream); 2429 substream->hw_opened = 0; 2430 } 2431 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2432 pm_qos_remove_request(&substream->latency_pm_qos_req); 2433 if (substream->pcm_release) { 2434 substream->pcm_release(substream); 2435 substream->pcm_release = NULL; 2436 } 2437 snd_pcm_detach_substream(substream); 2438 } 2439 EXPORT_SYMBOL(snd_pcm_release_substream); 2440 2441 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2442 struct file *file, 2443 struct snd_pcm_substream **rsubstream) 2444 { 2445 struct snd_pcm_substream *substream; 2446 int err; 2447 2448 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2449 if (err < 0) 2450 return err; 2451 if (substream->ref_count > 1) { 2452 *rsubstream = substream; 2453 return 0; 2454 } 2455 2456 err = snd_pcm_hw_constraints_init(substream); 2457 if (err < 0) { 2458 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2459 goto error; 2460 } 2461 2462 if ((err = substream->ops->open(substream)) < 0) 2463 goto error; 2464 2465 substream->hw_opened = 1; 2466 2467 err = snd_pcm_hw_constraints_complete(substream); 2468 if (err < 0) { 2469 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2470 goto error; 2471 } 2472 2473 *rsubstream = substream; 2474 return 0; 2475 2476 error: 2477 snd_pcm_release_substream(substream); 2478 return err; 2479 } 2480 EXPORT_SYMBOL(snd_pcm_open_substream); 2481 2482 static int snd_pcm_open_file(struct file *file, 2483 struct snd_pcm *pcm, 2484 int stream) 2485 { 2486 struct snd_pcm_file *pcm_file; 2487 struct snd_pcm_substream *substream; 2488 int err; 2489 2490 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2491 if (err < 0) 2492 return err; 2493 2494 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2495 if (pcm_file == NULL) { 2496 snd_pcm_release_substream(substream); 2497 return -ENOMEM; 2498 } 2499 pcm_file->substream = substream; 2500 if (substream->ref_count == 1) 2501 substream->pcm_release = pcm_release_private; 2502 file->private_data = pcm_file; 2503 2504 return 0; 2505 } 2506 2507 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2508 { 2509 struct snd_pcm *pcm; 2510 int err = nonseekable_open(inode, file); 2511 if (err < 0) 2512 return err; 2513 pcm = snd_lookup_minor_data(iminor(inode), 2514 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2515 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2516 if (pcm) 2517 snd_card_unref(pcm->card); 2518 return err; 2519 } 2520 2521 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2522 { 2523 struct snd_pcm *pcm; 2524 int err = nonseekable_open(inode, file); 2525 if (err < 0) 2526 return err; 2527 pcm = snd_lookup_minor_data(iminor(inode), 2528 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2529 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2530 if (pcm) 2531 snd_card_unref(pcm->card); 2532 return err; 2533 } 2534 2535 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2536 { 2537 int err; 2538 wait_queue_entry_t wait; 2539 2540 if (pcm == NULL) { 2541 err = -ENODEV; 2542 goto __error1; 2543 } 2544 err = snd_card_file_add(pcm->card, file); 2545 if (err < 0) 2546 goto __error1; 2547 if (!try_module_get(pcm->card->module)) { 2548 err = -EFAULT; 2549 goto __error2; 2550 } 2551 init_waitqueue_entry(&wait, current); 2552 add_wait_queue(&pcm->open_wait, &wait); 2553 mutex_lock(&pcm->open_mutex); 2554 while (1) { 2555 err = snd_pcm_open_file(file, pcm, stream); 2556 if (err >= 0) 2557 break; 2558 if (err == -EAGAIN) { 2559 if (file->f_flags & O_NONBLOCK) { 2560 err = -EBUSY; 2561 break; 2562 } 2563 } else 2564 break; 2565 set_current_state(TASK_INTERRUPTIBLE); 2566 mutex_unlock(&pcm->open_mutex); 2567 schedule(); 2568 mutex_lock(&pcm->open_mutex); 2569 if (pcm->card->shutdown) { 2570 err = -ENODEV; 2571 break; 2572 } 2573 if (signal_pending(current)) { 2574 err = -ERESTARTSYS; 2575 break; 2576 } 2577 } 2578 remove_wait_queue(&pcm->open_wait, &wait); 2579 mutex_unlock(&pcm->open_mutex); 2580 if (err < 0) 2581 goto __error; 2582 return err; 2583 2584 __error: 2585 module_put(pcm->card->module); 2586 __error2: 2587 snd_card_file_remove(pcm->card, file); 2588 __error1: 2589 return err; 2590 } 2591 2592 static int snd_pcm_release(struct inode *inode, struct file *file) 2593 { 2594 struct snd_pcm *pcm; 2595 struct snd_pcm_substream *substream; 2596 struct snd_pcm_file *pcm_file; 2597 2598 pcm_file = file->private_data; 2599 substream = pcm_file->substream; 2600 if (snd_BUG_ON(!substream)) 2601 return -ENXIO; 2602 pcm = substream->pcm; 2603 mutex_lock(&pcm->open_mutex); 2604 snd_pcm_release_substream(substream); 2605 kfree(pcm_file); 2606 mutex_unlock(&pcm->open_mutex); 2607 wake_up(&pcm->open_wait); 2608 module_put(pcm->card->module); 2609 snd_card_file_remove(pcm->card, file); 2610 return 0; 2611 } 2612 2613 /* check and update PCM state; return 0 or a negative error 2614 * call this inside PCM lock 2615 */ 2616 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2617 { 2618 switch (substream->runtime->status->state) { 2619 case SNDRV_PCM_STATE_DRAINING: 2620 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2621 return -EBADFD; 2622 /* Fall through */ 2623 case SNDRV_PCM_STATE_RUNNING: 2624 return snd_pcm_update_hw_ptr(substream); 2625 case SNDRV_PCM_STATE_PREPARED: 2626 case SNDRV_PCM_STATE_PAUSED: 2627 return 0; 2628 case SNDRV_PCM_STATE_SUSPENDED: 2629 return -ESTRPIPE; 2630 case SNDRV_PCM_STATE_XRUN: 2631 return -EPIPE; 2632 default: 2633 return -EBADFD; 2634 } 2635 } 2636 2637 /* increase the appl_ptr; returns the processed frames or a negative error */ 2638 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2639 snd_pcm_uframes_t frames, 2640 snd_pcm_sframes_t avail) 2641 { 2642 struct snd_pcm_runtime *runtime = substream->runtime; 2643 snd_pcm_sframes_t appl_ptr; 2644 int ret; 2645 2646 if (avail <= 0) 2647 return 0; 2648 if (frames > (snd_pcm_uframes_t)avail) 2649 frames = avail; 2650 appl_ptr = runtime->control->appl_ptr + frames; 2651 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2652 appl_ptr -= runtime->boundary; 2653 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2654 return ret < 0 ? ret : frames; 2655 } 2656 2657 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2658 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2659 snd_pcm_uframes_t frames, 2660 snd_pcm_sframes_t avail) 2661 { 2662 struct snd_pcm_runtime *runtime = substream->runtime; 2663 snd_pcm_sframes_t appl_ptr; 2664 int ret; 2665 2666 if (avail <= 0) 2667 return 0; 2668 if (frames > (snd_pcm_uframes_t)avail) 2669 frames = avail; 2670 appl_ptr = runtime->control->appl_ptr - frames; 2671 if (appl_ptr < 0) 2672 appl_ptr += runtime->boundary; 2673 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2674 /* NOTE: we return zero for errors because PulseAudio gets depressed 2675 * upon receiving an error from rewind ioctl and stops processing 2676 * any longer. Returning zero means that no rewind is done, so 2677 * it's not absolutely wrong to answer like that. 2678 */ 2679 return ret < 0 ? 0 : frames; 2680 } 2681 2682 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2683 snd_pcm_uframes_t frames) 2684 { 2685 snd_pcm_sframes_t ret; 2686 2687 if (frames == 0) 2688 return 0; 2689 2690 snd_pcm_stream_lock_irq(substream); 2691 ret = do_pcm_hwsync(substream); 2692 if (!ret) 2693 ret = rewind_appl_ptr(substream, frames, 2694 snd_pcm_hw_avail(substream)); 2695 snd_pcm_stream_unlock_irq(substream); 2696 return ret; 2697 } 2698 2699 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2700 snd_pcm_uframes_t frames) 2701 { 2702 snd_pcm_sframes_t ret; 2703 2704 if (frames == 0) 2705 return 0; 2706 2707 snd_pcm_stream_lock_irq(substream); 2708 ret = do_pcm_hwsync(substream); 2709 if (!ret) 2710 ret = forward_appl_ptr(substream, frames, 2711 snd_pcm_avail(substream)); 2712 snd_pcm_stream_unlock_irq(substream); 2713 return ret; 2714 } 2715 2716 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2717 { 2718 int err; 2719 2720 snd_pcm_stream_lock_irq(substream); 2721 err = do_pcm_hwsync(substream); 2722 snd_pcm_stream_unlock_irq(substream); 2723 return err; 2724 } 2725 2726 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2727 snd_pcm_sframes_t *delay) 2728 { 2729 int err; 2730 snd_pcm_sframes_t n = 0; 2731 2732 snd_pcm_stream_lock_irq(substream); 2733 err = do_pcm_hwsync(substream); 2734 if (!err) 2735 n = snd_pcm_calc_delay(substream); 2736 snd_pcm_stream_unlock_irq(substream); 2737 if (!err) 2738 *delay = n; 2739 return err; 2740 } 2741 2742 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2743 struct snd_pcm_sync_ptr __user *_sync_ptr) 2744 { 2745 struct snd_pcm_runtime *runtime = substream->runtime; 2746 struct snd_pcm_sync_ptr sync_ptr; 2747 volatile struct snd_pcm_mmap_status *status; 2748 volatile struct snd_pcm_mmap_control *control; 2749 int err; 2750 2751 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2752 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2753 return -EFAULT; 2754 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2755 return -EFAULT; 2756 status = runtime->status; 2757 control = runtime->control; 2758 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2759 err = snd_pcm_hwsync(substream); 2760 if (err < 0) 2761 return err; 2762 } 2763 snd_pcm_stream_lock_irq(substream); 2764 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2765 err = pcm_lib_apply_appl_ptr(substream, 2766 sync_ptr.c.control.appl_ptr); 2767 if (err < 0) { 2768 snd_pcm_stream_unlock_irq(substream); 2769 return err; 2770 } 2771 } else { 2772 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2773 } 2774 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2775 control->avail_min = sync_ptr.c.control.avail_min; 2776 else 2777 sync_ptr.c.control.avail_min = control->avail_min; 2778 sync_ptr.s.status.state = status->state; 2779 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2780 sync_ptr.s.status.tstamp = status->tstamp; 2781 sync_ptr.s.status.suspended_state = status->suspended_state; 2782 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2783 snd_pcm_stream_unlock_irq(substream); 2784 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2785 return -EFAULT; 2786 return 0; 2787 } 2788 2789 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2790 { 2791 struct snd_pcm_runtime *runtime = substream->runtime; 2792 int arg; 2793 2794 if (get_user(arg, _arg)) 2795 return -EFAULT; 2796 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2797 return -EINVAL; 2798 runtime->tstamp_type = arg; 2799 return 0; 2800 } 2801 2802 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2803 struct snd_xferi __user *_xferi) 2804 { 2805 struct snd_xferi xferi; 2806 struct snd_pcm_runtime *runtime = substream->runtime; 2807 snd_pcm_sframes_t result; 2808 2809 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2810 return -EBADFD; 2811 if (put_user(0, &_xferi->result)) 2812 return -EFAULT; 2813 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2814 return -EFAULT; 2815 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2816 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2817 else 2818 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2819 __put_user(result, &_xferi->result); 2820 return result < 0 ? result : 0; 2821 } 2822 2823 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2824 struct snd_xfern __user *_xfern) 2825 { 2826 struct snd_xfern xfern; 2827 struct snd_pcm_runtime *runtime = substream->runtime; 2828 void *bufs; 2829 snd_pcm_sframes_t result; 2830 2831 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2832 return -EBADFD; 2833 if (runtime->channels > 128) 2834 return -EINVAL; 2835 if (put_user(0, &_xfern->result)) 2836 return -EFAULT; 2837 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2838 return -EFAULT; 2839 2840 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2841 if (IS_ERR(bufs)) 2842 return PTR_ERR(bufs); 2843 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2844 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2845 else 2846 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2847 kfree(bufs); 2848 __put_user(result, &_xfern->result); 2849 return result < 0 ? result : 0; 2850 } 2851 2852 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2853 snd_pcm_uframes_t __user *_frames) 2854 { 2855 snd_pcm_uframes_t frames; 2856 snd_pcm_sframes_t result; 2857 2858 if (get_user(frames, _frames)) 2859 return -EFAULT; 2860 if (put_user(0, _frames)) 2861 return -EFAULT; 2862 result = snd_pcm_rewind(substream, frames); 2863 __put_user(result, _frames); 2864 return result < 0 ? result : 0; 2865 } 2866 2867 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2868 snd_pcm_uframes_t __user *_frames) 2869 { 2870 snd_pcm_uframes_t frames; 2871 snd_pcm_sframes_t result; 2872 2873 if (get_user(frames, _frames)) 2874 return -EFAULT; 2875 if (put_user(0, _frames)) 2876 return -EFAULT; 2877 result = snd_pcm_forward(substream, frames); 2878 __put_user(result, _frames); 2879 return result < 0 ? result : 0; 2880 } 2881 2882 static int snd_pcm_common_ioctl(struct file *file, 2883 struct snd_pcm_substream *substream, 2884 unsigned int cmd, void __user *arg) 2885 { 2886 struct snd_pcm_file *pcm_file = file->private_data; 2887 int res; 2888 2889 if (PCM_RUNTIME_CHECK(substream)) 2890 return -ENXIO; 2891 2892 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2893 if (res < 0) 2894 return res; 2895 2896 switch (cmd) { 2897 case SNDRV_PCM_IOCTL_PVERSION: 2898 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2899 case SNDRV_PCM_IOCTL_INFO: 2900 return snd_pcm_info_user(substream, arg); 2901 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2902 return 0; 2903 case SNDRV_PCM_IOCTL_TTSTAMP: 2904 return snd_pcm_tstamp(substream, arg); 2905 case SNDRV_PCM_IOCTL_USER_PVERSION: 2906 if (get_user(pcm_file->user_pversion, 2907 (unsigned int __user *)arg)) 2908 return -EFAULT; 2909 return 0; 2910 case SNDRV_PCM_IOCTL_HW_REFINE: 2911 return snd_pcm_hw_refine_user(substream, arg); 2912 case SNDRV_PCM_IOCTL_HW_PARAMS: 2913 return snd_pcm_hw_params_user(substream, arg); 2914 case SNDRV_PCM_IOCTL_HW_FREE: 2915 return snd_pcm_hw_free(substream); 2916 case SNDRV_PCM_IOCTL_SW_PARAMS: 2917 return snd_pcm_sw_params_user(substream, arg); 2918 case SNDRV_PCM_IOCTL_STATUS: 2919 return snd_pcm_status_user(substream, arg, false); 2920 case SNDRV_PCM_IOCTL_STATUS_EXT: 2921 return snd_pcm_status_user(substream, arg, true); 2922 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2923 return snd_pcm_channel_info_user(substream, arg); 2924 case SNDRV_PCM_IOCTL_PREPARE: 2925 return snd_pcm_prepare(substream, file); 2926 case SNDRV_PCM_IOCTL_RESET: 2927 return snd_pcm_reset(substream); 2928 case SNDRV_PCM_IOCTL_START: 2929 return snd_pcm_start_lock_irq(substream); 2930 case SNDRV_PCM_IOCTL_LINK: 2931 return snd_pcm_link(substream, (int)(unsigned long) arg); 2932 case SNDRV_PCM_IOCTL_UNLINK: 2933 return snd_pcm_unlink(substream); 2934 case SNDRV_PCM_IOCTL_RESUME: 2935 return snd_pcm_resume(substream); 2936 case SNDRV_PCM_IOCTL_XRUN: 2937 return snd_pcm_xrun(substream); 2938 case SNDRV_PCM_IOCTL_HWSYNC: 2939 return snd_pcm_hwsync(substream); 2940 case SNDRV_PCM_IOCTL_DELAY: 2941 { 2942 snd_pcm_sframes_t delay; 2943 snd_pcm_sframes_t __user *res = arg; 2944 int err; 2945 2946 err = snd_pcm_delay(substream, &delay); 2947 if (err) 2948 return err; 2949 if (put_user(delay, res)) 2950 return -EFAULT; 2951 return 0; 2952 } 2953 case SNDRV_PCM_IOCTL_SYNC_PTR: 2954 return snd_pcm_sync_ptr(substream, arg); 2955 #ifdef CONFIG_SND_SUPPORT_OLD_API 2956 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2957 return snd_pcm_hw_refine_old_user(substream, arg); 2958 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2959 return snd_pcm_hw_params_old_user(substream, arg); 2960 #endif 2961 case SNDRV_PCM_IOCTL_DRAIN: 2962 return snd_pcm_drain(substream, file); 2963 case SNDRV_PCM_IOCTL_DROP: 2964 return snd_pcm_drop(substream); 2965 case SNDRV_PCM_IOCTL_PAUSE: 2966 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2967 substream, 2968 (int)(unsigned long)arg); 2969 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2970 case SNDRV_PCM_IOCTL_READI_FRAMES: 2971 return snd_pcm_xferi_frames_ioctl(substream, arg); 2972 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2973 case SNDRV_PCM_IOCTL_READN_FRAMES: 2974 return snd_pcm_xfern_frames_ioctl(substream, arg); 2975 case SNDRV_PCM_IOCTL_REWIND: 2976 return snd_pcm_rewind_ioctl(substream, arg); 2977 case SNDRV_PCM_IOCTL_FORWARD: 2978 return snd_pcm_forward_ioctl(substream, arg); 2979 } 2980 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2981 return -ENOTTY; 2982 } 2983 2984 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 2985 unsigned long arg) 2986 { 2987 struct snd_pcm_file *pcm_file; 2988 2989 pcm_file = file->private_data; 2990 2991 if (((cmd >> 8) & 0xff) != 'A') 2992 return -ENOTTY; 2993 2994 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 2995 (void __user *)arg); 2996 } 2997 2998 /** 2999 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3000 * @substream: PCM substream 3001 * @cmd: IOCTL cmd 3002 * @arg: IOCTL argument 3003 * 3004 * The function is provided primarily for OSS layer and USB gadget drivers, 3005 * and it allows only the limited set of ioctls (hw_params, sw_params, 3006 * prepare, start, drain, drop, forward). 3007 */ 3008 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3009 unsigned int cmd, void *arg) 3010 { 3011 snd_pcm_uframes_t *frames = arg; 3012 snd_pcm_sframes_t result; 3013 3014 switch (cmd) { 3015 case SNDRV_PCM_IOCTL_FORWARD: 3016 { 3017 /* provided only for OSS; capture-only and no value returned */ 3018 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3019 return -EINVAL; 3020 result = snd_pcm_forward(substream, *frames); 3021 return result < 0 ? result : 0; 3022 } 3023 case SNDRV_PCM_IOCTL_HW_PARAMS: 3024 return snd_pcm_hw_params(substream, arg); 3025 case SNDRV_PCM_IOCTL_SW_PARAMS: 3026 return snd_pcm_sw_params(substream, arg); 3027 case SNDRV_PCM_IOCTL_PREPARE: 3028 return snd_pcm_prepare(substream, NULL); 3029 case SNDRV_PCM_IOCTL_START: 3030 return snd_pcm_start_lock_irq(substream); 3031 case SNDRV_PCM_IOCTL_DRAIN: 3032 return snd_pcm_drain(substream, NULL); 3033 case SNDRV_PCM_IOCTL_DROP: 3034 return snd_pcm_drop(substream); 3035 case SNDRV_PCM_IOCTL_DELAY: 3036 return snd_pcm_delay(substream, frames); 3037 default: 3038 return -EINVAL; 3039 } 3040 } 3041 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3042 3043 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3044 loff_t * offset) 3045 { 3046 struct snd_pcm_file *pcm_file; 3047 struct snd_pcm_substream *substream; 3048 struct snd_pcm_runtime *runtime; 3049 snd_pcm_sframes_t result; 3050 3051 pcm_file = file->private_data; 3052 substream = pcm_file->substream; 3053 if (PCM_RUNTIME_CHECK(substream)) 3054 return -ENXIO; 3055 runtime = substream->runtime; 3056 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3057 return -EBADFD; 3058 if (!frame_aligned(runtime, count)) 3059 return -EINVAL; 3060 count = bytes_to_frames(runtime, count); 3061 result = snd_pcm_lib_read(substream, buf, count); 3062 if (result > 0) 3063 result = frames_to_bytes(runtime, result); 3064 return result; 3065 } 3066 3067 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3068 size_t count, loff_t * offset) 3069 { 3070 struct snd_pcm_file *pcm_file; 3071 struct snd_pcm_substream *substream; 3072 struct snd_pcm_runtime *runtime; 3073 snd_pcm_sframes_t result; 3074 3075 pcm_file = file->private_data; 3076 substream = pcm_file->substream; 3077 if (PCM_RUNTIME_CHECK(substream)) 3078 return -ENXIO; 3079 runtime = substream->runtime; 3080 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3081 return -EBADFD; 3082 if (!frame_aligned(runtime, count)) 3083 return -EINVAL; 3084 count = bytes_to_frames(runtime, count); 3085 result = snd_pcm_lib_write(substream, buf, count); 3086 if (result > 0) 3087 result = frames_to_bytes(runtime, result); 3088 return result; 3089 } 3090 3091 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3092 { 3093 struct snd_pcm_file *pcm_file; 3094 struct snd_pcm_substream *substream; 3095 struct snd_pcm_runtime *runtime; 3096 snd_pcm_sframes_t result; 3097 unsigned long i; 3098 void __user **bufs; 3099 snd_pcm_uframes_t frames; 3100 3101 pcm_file = iocb->ki_filp->private_data; 3102 substream = pcm_file->substream; 3103 if (PCM_RUNTIME_CHECK(substream)) 3104 return -ENXIO; 3105 runtime = substream->runtime; 3106 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3107 return -EBADFD; 3108 if (!iter_is_iovec(to)) 3109 return -EINVAL; 3110 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3111 return -EINVAL; 3112 if (!frame_aligned(runtime, to->iov->iov_len)) 3113 return -EINVAL; 3114 frames = bytes_to_samples(runtime, to->iov->iov_len); 3115 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3116 if (bufs == NULL) 3117 return -ENOMEM; 3118 for (i = 0; i < to->nr_segs; ++i) 3119 bufs[i] = to->iov[i].iov_base; 3120 result = snd_pcm_lib_readv(substream, bufs, frames); 3121 if (result > 0) 3122 result = frames_to_bytes(runtime, result); 3123 kfree(bufs); 3124 return result; 3125 } 3126 3127 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3128 { 3129 struct snd_pcm_file *pcm_file; 3130 struct snd_pcm_substream *substream; 3131 struct snd_pcm_runtime *runtime; 3132 snd_pcm_sframes_t result; 3133 unsigned long i; 3134 void __user **bufs; 3135 snd_pcm_uframes_t frames; 3136 3137 pcm_file = iocb->ki_filp->private_data; 3138 substream = pcm_file->substream; 3139 if (PCM_RUNTIME_CHECK(substream)) 3140 return -ENXIO; 3141 runtime = substream->runtime; 3142 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3143 return -EBADFD; 3144 if (!iter_is_iovec(from)) 3145 return -EINVAL; 3146 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3147 !frame_aligned(runtime, from->iov->iov_len)) 3148 return -EINVAL; 3149 frames = bytes_to_samples(runtime, from->iov->iov_len); 3150 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3151 if (bufs == NULL) 3152 return -ENOMEM; 3153 for (i = 0; i < from->nr_segs; ++i) 3154 bufs[i] = from->iov[i].iov_base; 3155 result = snd_pcm_lib_writev(substream, bufs, frames); 3156 if (result > 0) 3157 result = frames_to_bytes(runtime, result); 3158 kfree(bufs); 3159 return result; 3160 } 3161 3162 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3163 { 3164 struct snd_pcm_file *pcm_file; 3165 struct snd_pcm_substream *substream; 3166 struct snd_pcm_runtime *runtime; 3167 __poll_t mask, ok; 3168 snd_pcm_uframes_t avail; 3169 3170 pcm_file = file->private_data; 3171 3172 substream = pcm_file->substream; 3173 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3174 ok = EPOLLOUT | EPOLLWRNORM; 3175 else 3176 ok = EPOLLIN | EPOLLRDNORM; 3177 if (PCM_RUNTIME_CHECK(substream)) 3178 return ok | EPOLLERR; 3179 3180 runtime = substream->runtime; 3181 poll_wait(file, &runtime->sleep, wait); 3182 3183 mask = 0; 3184 snd_pcm_stream_lock_irq(substream); 3185 avail = snd_pcm_avail(substream); 3186 switch (runtime->status->state) { 3187 case SNDRV_PCM_STATE_RUNNING: 3188 case SNDRV_PCM_STATE_PREPARED: 3189 case SNDRV_PCM_STATE_PAUSED: 3190 if (avail >= runtime->control->avail_min) 3191 mask = ok; 3192 break; 3193 case SNDRV_PCM_STATE_DRAINING: 3194 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3195 mask = ok; 3196 if (!avail) 3197 mask |= EPOLLERR; 3198 } 3199 break; 3200 default: 3201 mask = ok | EPOLLERR; 3202 break; 3203 } 3204 snd_pcm_stream_unlock_irq(substream); 3205 return mask; 3206 } 3207 3208 /* 3209 * mmap support 3210 */ 3211 3212 /* 3213 * Only on coherent architectures, we can mmap the status and the control records 3214 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3215 */ 3216 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3217 /* 3218 * mmap status record 3219 */ 3220 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3221 { 3222 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3223 struct snd_pcm_runtime *runtime; 3224 3225 if (substream == NULL) 3226 return VM_FAULT_SIGBUS; 3227 runtime = substream->runtime; 3228 vmf->page = virt_to_page(runtime->status); 3229 get_page(vmf->page); 3230 return 0; 3231 } 3232 3233 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3234 { 3235 .fault = snd_pcm_mmap_status_fault, 3236 }; 3237 3238 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3239 struct vm_area_struct *area) 3240 { 3241 long size; 3242 if (!(area->vm_flags & VM_READ)) 3243 return -EINVAL; 3244 size = area->vm_end - area->vm_start; 3245 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3246 return -EINVAL; 3247 area->vm_ops = &snd_pcm_vm_ops_status; 3248 area->vm_private_data = substream; 3249 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3250 return 0; 3251 } 3252 3253 /* 3254 * mmap control record 3255 */ 3256 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3257 { 3258 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3259 struct snd_pcm_runtime *runtime; 3260 3261 if (substream == NULL) 3262 return VM_FAULT_SIGBUS; 3263 runtime = substream->runtime; 3264 vmf->page = virt_to_page(runtime->control); 3265 get_page(vmf->page); 3266 return 0; 3267 } 3268 3269 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3270 { 3271 .fault = snd_pcm_mmap_control_fault, 3272 }; 3273 3274 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3275 struct vm_area_struct *area) 3276 { 3277 long size; 3278 if (!(area->vm_flags & VM_READ)) 3279 return -EINVAL; 3280 size = area->vm_end - area->vm_start; 3281 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3282 return -EINVAL; 3283 area->vm_ops = &snd_pcm_vm_ops_control; 3284 area->vm_private_data = substream; 3285 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3286 return 0; 3287 } 3288 3289 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3290 { 3291 if (pcm_file->no_compat_mmap) 3292 return false; 3293 /* See pcm_control_mmap_allowed() below. 3294 * Since older alsa-lib requires both status and control mmaps to be 3295 * coupled, we have to disable the status mmap for old alsa-lib, too. 3296 */ 3297 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3298 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3299 return false; 3300 return true; 3301 } 3302 3303 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3304 { 3305 if (pcm_file->no_compat_mmap) 3306 return false; 3307 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3308 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3309 * thus it effectively assures the manual update of appl_ptr. 3310 */ 3311 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3312 return false; 3313 return true; 3314 } 3315 3316 #else /* ! coherent mmap */ 3317 /* 3318 * don't support mmap for status and control records. 3319 */ 3320 #define pcm_status_mmap_allowed(pcm_file) false 3321 #define pcm_control_mmap_allowed(pcm_file) false 3322 3323 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3324 struct vm_area_struct *area) 3325 { 3326 return -ENXIO; 3327 } 3328 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3329 struct vm_area_struct *area) 3330 { 3331 return -ENXIO; 3332 } 3333 #endif /* coherent mmap */ 3334 3335 static inline struct page * 3336 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3337 { 3338 void *vaddr = substream->runtime->dma_area + ofs; 3339 3340 switch (substream->dma_buffer.dev.type) { 3341 #ifdef CONFIG_SND_DMA_SGBUF 3342 case SNDRV_DMA_TYPE_DEV_SG: 3343 case SNDRV_DMA_TYPE_DEV_UC_SG: 3344 return snd_pcm_sgbuf_ops_page(substream, ofs); 3345 #endif /* CONFIG_SND_DMA_SGBUF */ 3346 case SNDRV_DMA_TYPE_VMALLOC: 3347 return vmalloc_to_page(vaddr); 3348 default: 3349 return virt_to_page(vaddr); 3350 } 3351 } 3352 3353 /* 3354 * fault callback for mmapping a RAM page 3355 */ 3356 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3357 { 3358 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3359 struct snd_pcm_runtime *runtime; 3360 unsigned long offset; 3361 struct page * page; 3362 size_t dma_bytes; 3363 3364 if (substream == NULL) 3365 return VM_FAULT_SIGBUS; 3366 runtime = substream->runtime; 3367 offset = vmf->pgoff << PAGE_SHIFT; 3368 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3369 if (offset > dma_bytes - PAGE_SIZE) 3370 return VM_FAULT_SIGBUS; 3371 if (substream->ops->page) 3372 page = substream->ops->page(substream, offset); 3373 else 3374 page = snd_pcm_default_page_ops(substream, offset); 3375 if (!page) 3376 return VM_FAULT_SIGBUS; 3377 get_page(page); 3378 vmf->page = page; 3379 return 0; 3380 } 3381 3382 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3383 .open = snd_pcm_mmap_data_open, 3384 .close = snd_pcm_mmap_data_close, 3385 }; 3386 3387 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3388 .open = snd_pcm_mmap_data_open, 3389 .close = snd_pcm_mmap_data_close, 3390 .fault = snd_pcm_mmap_data_fault, 3391 }; 3392 3393 /* 3394 * mmap the DMA buffer on RAM 3395 */ 3396 3397 /** 3398 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3399 * @substream: PCM substream 3400 * @area: VMA 3401 * 3402 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3403 * this function is invoked implicitly. 3404 */ 3405 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3406 struct vm_area_struct *area) 3407 { 3408 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3409 #ifdef CONFIG_GENERIC_ALLOCATOR 3410 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3411 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3412 return remap_pfn_range(area, area->vm_start, 3413 substream->dma_buffer.addr >> PAGE_SHIFT, 3414 area->vm_end - area->vm_start, area->vm_page_prot); 3415 } 3416 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3417 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3418 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3419 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3420 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3421 area, 3422 substream->runtime->dma_area, 3423 substream->runtime->dma_addr, 3424 substream->runtime->dma_bytes); 3425 #endif /* CONFIG_X86 */ 3426 /* mmap with fault handler */ 3427 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3428 return 0; 3429 } 3430 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3431 3432 /* 3433 * mmap the DMA buffer on I/O memory area 3434 */ 3435 #if SNDRV_PCM_INFO_MMAP_IOMEM 3436 /** 3437 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3438 * @substream: PCM substream 3439 * @area: VMA 3440 * 3441 * When your hardware uses the iomapped pages as the hardware buffer and 3442 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3443 * is supposed to work only on limited architectures. 3444 */ 3445 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3446 struct vm_area_struct *area) 3447 { 3448 struct snd_pcm_runtime *runtime = substream->runtime; 3449 3450 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3451 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3452 } 3453 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3454 #endif /* SNDRV_PCM_INFO_MMAP */ 3455 3456 /* 3457 * mmap DMA buffer 3458 */ 3459 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3460 struct vm_area_struct *area) 3461 { 3462 struct snd_pcm_runtime *runtime; 3463 long size; 3464 unsigned long offset; 3465 size_t dma_bytes; 3466 int err; 3467 3468 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3469 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3470 return -EINVAL; 3471 } else { 3472 if (!(area->vm_flags & VM_READ)) 3473 return -EINVAL; 3474 } 3475 runtime = substream->runtime; 3476 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3477 return -EBADFD; 3478 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3479 return -ENXIO; 3480 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3481 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3482 return -EINVAL; 3483 size = area->vm_end - area->vm_start; 3484 offset = area->vm_pgoff << PAGE_SHIFT; 3485 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3486 if ((size_t)size > dma_bytes) 3487 return -EINVAL; 3488 if (offset > dma_bytes - size) 3489 return -EINVAL; 3490 3491 area->vm_ops = &snd_pcm_vm_ops_data; 3492 area->vm_private_data = substream; 3493 if (substream->ops->mmap) 3494 err = substream->ops->mmap(substream, area); 3495 else 3496 err = snd_pcm_lib_default_mmap(substream, area); 3497 if (!err) 3498 atomic_inc(&substream->mmap_count); 3499 return err; 3500 } 3501 EXPORT_SYMBOL(snd_pcm_mmap_data); 3502 3503 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3504 { 3505 struct snd_pcm_file * pcm_file; 3506 struct snd_pcm_substream *substream; 3507 unsigned long offset; 3508 3509 pcm_file = file->private_data; 3510 substream = pcm_file->substream; 3511 if (PCM_RUNTIME_CHECK(substream)) 3512 return -ENXIO; 3513 3514 offset = area->vm_pgoff << PAGE_SHIFT; 3515 switch (offset) { 3516 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3517 if (!pcm_status_mmap_allowed(pcm_file)) 3518 return -ENXIO; 3519 return snd_pcm_mmap_status(substream, file, area); 3520 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3521 if (!pcm_control_mmap_allowed(pcm_file)) 3522 return -ENXIO; 3523 return snd_pcm_mmap_control(substream, file, area); 3524 default: 3525 return snd_pcm_mmap_data(substream, file, area); 3526 } 3527 return 0; 3528 } 3529 3530 static int snd_pcm_fasync(int fd, struct file * file, int on) 3531 { 3532 struct snd_pcm_file * pcm_file; 3533 struct snd_pcm_substream *substream; 3534 struct snd_pcm_runtime *runtime; 3535 3536 pcm_file = file->private_data; 3537 substream = pcm_file->substream; 3538 if (PCM_RUNTIME_CHECK(substream)) 3539 return -ENXIO; 3540 runtime = substream->runtime; 3541 return fasync_helper(fd, file, on, &runtime->fasync); 3542 } 3543 3544 /* 3545 * ioctl32 compat 3546 */ 3547 #ifdef CONFIG_COMPAT 3548 #include "pcm_compat.c" 3549 #else 3550 #define snd_pcm_ioctl_compat NULL 3551 #endif 3552 3553 /* 3554 * To be removed helpers to keep binary compatibility 3555 */ 3556 3557 #ifdef CONFIG_SND_SUPPORT_OLD_API 3558 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3559 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3560 3561 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3562 struct snd_pcm_hw_params_old *oparams) 3563 { 3564 unsigned int i; 3565 3566 memset(params, 0, sizeof(*params)); 3567 params->flags = oparams->flags; 3568 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3569 params->masks[i].bits[0] = oparams->masks[i]; 3570 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3571 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3572 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3573 params->info = oparams->info; 3574 params->msbits = oparams->msbits; 3575 params->rate_num = oparams->rate_num; 3576 params->rate_den = oparams->rate_den; 3577 params->fifo_size = oparams->fifo_size; 3578 } 3579 3580 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3581 struct snd_pcm_hw_params *params) 3582 { 3583 unsigned int i; 3584 3585 memset(oparams, 0, sizeof(*oparams)); 3586 oparams->flags = params->flags; 3587 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3588 oparams->masks[i] = params->masks[i].bits[0]; 3589 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3590 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3591 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3592 oparams->info = params->info; 3593 oparams->msbits = params->msbits; 3594 oparams->rate_num = params->rate_num; 3595 oparams->rate_den = params->rate_den; 3596 oparams->fifo_size = params->fifo_size; 3597 } 3598 3599 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3600 struct snd_pcm_hw_params_old __user * _oparams) 3601 { 3602 struct snd_pcm_hw_params *params; 3603 struct snd_pcm_hw_params_old *oparams = NULL; 3604 int err; 3605 3606 params = kmalloc(sizeof(*params), GFP_KERNEL); 3607 if (!params) 3608 return -ENOMEM; 3609 3610 oparams = memdup_user(_oparams, sizeof(*oparams)); 3611 if (IS_ERR(oparams)) { 3612 err = PTR_ERR(oparams); 3613 goto out; 3614 } 3615 snd_pcm_hw_convert_from_old_params(params, oparams); 3616 err = snd_pcm_hw_refine(substream, params); 3617 if (err < 0) 3618 goto out_old; 3619 3620 err = fixup_unreferenced_params(substream, params); 3621 if (err < 0) 3622 goto out_old; 3623 3624 snd_pcm_hw_convert_to_old_params(oparams, params); 3625 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3626 err = -EFAULT; 3627 out_old: 3628 kfree(oparams); 3629 out: 3630 kfree(params); 3631 return err; 3632 } 3633 3634 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3635 struct snd_pcm_hw_params_old __user * _oparams) 3636 { 3637 struct snd_pcm_hw_params *params; 3638 struct snd_pcm_hw_params_old *oparams = NULL; 3639 int err; 3640 3641 params = kmalloc(sizeof(*params), GFP_KERNEL); 3642 if (!params) 3643 return -ENOMEM; 3644 3645 oparams = memdup_user(_oparams, sizeof(*oparams)); 3646 if (IS_ERR(oparams)) { 3647 err = PTR_ERR(oparams); 3648 goto out; 3649 } 3650 3651 snd_pcm_hw_convert_from_old_params(params, oparams); 3652 err = snd_pcm_hw_params(substream, params); 3653 if (err < 0) 3654 goto out_old; 3655 3656 snd_pcm_hw_convert_to_old_params(oparams, params); 3657 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3658 err = -EFAULT; 3659 out_old: 3660 kfree(oparams); 3661 out: 3662 kfree(params); 3663 return err; 3664 } 3665 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3666 3667 #ifndef CONFIG_MMU 3668 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3669 unsigned long addr, 3670 unsigned long len, 3671 unsigned long pgoff, 3672 unsigned long flags) 3673 { 3674 struct snd_pcm_file *pcm_file = file->private_data; 3675 struct snd_pcm_substream *substream = pcm_file->substream; 3676 struct snd_pcm_runtime *runtime = substream->runtime; 3677 unsigned long offset = pgoff << PAGE_SHIFT; 3678 3679 switch (offset) { 3680 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3681 return (unsigned long)runtime->status; 3682 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3683 return (unsigned long)runtime->control; 3684 default: 3685 return (unsigned long)runtime->dma_area + offset; 3686 } 3687 } 3688 #else 3689 # define snd_pcm_get_unmapped_area NULL 3690 #endif 3691 3692 /* 3693 * Register section 3694 */ 3695 3696 const struct file_operations snd_pcm_f_ops[2] = { 3697 { 3698 .owner = THIS_MODULE, 3699 .write = snd_pcm_write, 3700 .write_iter = snd_pcm_writev, 3701 .open = snd_pcm_playback_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 .owner = THIS_MODULE, 3713 .read = snd_pcm_read, 3714 .read_iter = snd_pcm_readv, 3715 .open = snd_pcm_capture_open, 3716 .release = snd_pcm_release, 3717 .llseek = no_llseek, 3718 .poll = snd_pcm_poll, 3719 .unlocked_ioctl = snd_pcm_ioctl, 3720 .compat_ioctl = snd_pcm_ioctl_compat, 3721 .mmap = snd_pcm_mmap, 3722 .fasync = snd_pcm_fasync, 3723 .get_unmapped_area = snd_pcm_get_unmapped_area, 3724 } 3725 }; 3726