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 /* Run PCM ioctl ops */ 182 static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream, 183 unsigned cmd, void *arg) 184 { 185 if (substream->ops->ioctl) 186 return substream->ops->ioctl(substream, cmd, arg); 187 else 188 return snd_pcm_lib_ioctl(substream, cmd, arg); 189 } 190 191 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 192 { 193 struct snd_pcm *pcm = substream->pcm; 194 struct snd_pcm_str *pstr = substream->pstr; 195 196 memset(info, 0, sizeof(*info)); 197 info->card = pcm->card->number; 198 info->device = pcm->device; 199 info->stream = substream->stream; 200 info->subdevice = substream->number; 201 strlcpy(info->id, pcm->id, sizeof(info->id)); 202 strlcpy(info->name, pcm->name, sizeof(info->name)); 203 info->dev_class = pcm->dev_class; 204 info->dev_subclass = pcm->dev_subclass; 205 info->subdevices_count = pstr->substream_count; 206 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 207 strlcpy(info->subname, substream->name, sizeof(info->subname)); 208 209 return 0; 210 } 211 212 int snd_pcm_info_user(struct snd_pcm_substream *substream, 213 struct snd_pcm_info __user * _info) 214 { 215 struct snd_pcm_info *info; 216 int err; 217 218 info = kmalloc(sizeof(*info), GFP_KERNEL); 219 if (! info) 220 return -ENOMEM; 221 err = snd_pcm_info(substream, info); 222 if (err >= 0) { 223 if (copy_to_user(_info, info, sizeof(*info))) 224 err = -EFAULT; 225 } 226 kfree(info); 227 return err; 228 } 229 230 static bool hw_support_mmap(struct snd_pcm_substream *substream) 231 { 232 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 233 return false; 234 235 if (substream->ops->mmap || 236 (substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV && 237 substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV_UC)) 238 return true; 239 240 return dma_can_mmap(substream->dma_buffer.dev.dev); 241 } 242 243 static int constrain_mask_params(struct snd_pcm_substream *substream, 244 struct snd_pcm_hw_params *params) 245 { 246 struct snd_pcm_hw_constraints *constrs = 247 &substream->runtime->hw_constraints; 248 struct snd_mask *m; 249 unsigned int k; 250 struct snd_mask old_mask; 251 int changed; 252 253 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 254 m = hw_param_mask(params, k); 255 if (snd_mask_empty(m)) 256 return -EINVAL; 257 258 /* This parameter is not requested to change by a caller. */ 259 if (!(params->rmask & (1 << k))) 260 continue; 261 262 if (trace_hw_mask_param_enabled()) 263 old_mask = *m; 264 265 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 266 if (changed < 0) 267 return changed; 268 if (changed == 0) 269 continue; 270 271 /* Set corresponding flag so that the caller gets it. */ 272 trace_hw_mask_param(substream, k, 0, &old_mask, m); 273 params->cmask |= 1 << k; 274 } 275 276 return 0; 277 } 278 279 static int constrain_interval_params(struct snd_pcm_substream *substream, 280 struct snd_pcm_hw_params *params) 281 { 282 struct snd_pcm_hw_constraints *constrs = 283 &substream->runtime->hw_constraints; 284 struct snd_interval *i; 285 unsigned int k; 286 struct snd_interval old_interval; 287 int changed; 288 289 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 290 i = hw_param_interval(params, k); 291 if (snd_interval_empty(i)) 292 return -EINVAL; 293 294 /* This parameter is not requested to change by a caller. */ 295 if (!(params->rmask & (1 << k))) 296 continue; 297 298 if (trace_hw_interval_param_enabled()) 299 old_interval = *i; 300 301 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 302 if (changed < 0) 303 return changed; 304 if (changed == 0) 305 continue; 306 307 /* Set corresponding flag so that the caller gets it. */ 308 trace_hw_interval_param(substream, k, 0, &old_interval, i); 309 params->cmask |= 1 << k; 310 } 311 312 return 0; 313 } 314 315 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 316 struct snd_pcm_hw_params *params) 317 { 318 struct snd_pcm_hw_constraints *constrs = 319 &substream->runtime->hw_constraints; 320 unsigned int k; 321 unsigned int *rstamps; 322 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 323 unsigned int stamp; 324 struct snd_pcm_hw_rule *r; 325 unsigned int d; 326 struct snd_mask old_mask; 327 struct snd_interval old_interval; 328 bool again; 329 int changed, err = 0; 330 331 /* 332 * Each application of rule has own sequence number. 333 * 334 * Each member of 'rstamps' array represents the sequence number of 335 * recent application of corresponding rule. 336 */ 337 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 338 if (!rstamps) 339 return -ENOMEM; 340 341 /* 342 * Each member of 'vstamps' array represents the sequence number of 343 * recent application of rule in which corresponding parameters were 344 * changed. 345 * 346 * In initial state, elements corresponding to parameters requested by 347 * a caller is 1. For unrequested parameters, corresponding members 348 * have 0 so that the parameters are never changed anymore. 349 */ 350 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 351 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 352 353 /* Due to the above design, actual sequence number starts at 2. */ 354 stamp = 2; 355 retry: 356 /* Apply all rules in order. */ 357 again = false; 358 for (k = 0; k < constrs->rules_num; k++) { 359 r = &constrs->rules[k]; 360 361 /* 362 * Check condition bits of this rule. When the rule has 363 * some condition bits, parameter without the bits is 364 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 365 * is an example of the condition bits. 366 */ 367 if (r->cond && !(r->cond & params->flags)) 368 continue; 369 370 /* 371 * The 'deps' array includes maximum three dependencies 372 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 373 * member of this array is a sentinel and should be 374 * negative value. 375 * 376 * This rule should be processed in this time when dependent 377 * parameters were changed at former applications of the other 378 * rules. 379 */ 380 for (d = 0; r->deps[d] >= 0; d++) { 381 if (vstamps[r->deps[d]] > rstamps[k]) 382 break; 383 } 384 if (r->deps[d] < 0) 385 continue; 386 387 if (trace_hw_mask_param_enabled()) { 388 if (hw_is_mask(r->var)) 389 old_mask = *hw_param_mask(params, r->var); 390 } 391 if (trace_hw_interval_param_enabled()) { 392 if (hw_is_interval(r->var)) 393 old_interval = *hw_param_interval(params, r->var); 394 } 395 396 changed = r->func(params, r); 397 if (changed < 0) { 398 err = changed; 399 goto out; 400 } 401 402 /* 403 * When the parameter is changed, notify it to the caller 404 * by corresponding returned bit, then preparing for next 405 * iteration. 406 */ 407 if (changed && r->var >= 0) { 408 if (hw_is_mask(r->var)) { 409 trace_hw_mask_param(substream, r->var, 410 k + 1, &old_mask, 411 hw_param_mask(params, r->var)); 412 } 413 if (hw_is_interval(r->var)) { 414 trace_hw_interval_param(substream, r->var, 415 k + 1, &old_interval, 416 hw_param_interval(params, r->var)); 417 } 418 419 params->cmask |= (1 << r->var); 420 vstamps[r->var] = stamp; 421 again = true; 422 } 423 424 rstamps[k] = stamp++; 425 } 426 427 /* Iterate to evaluate all rules till no parameters are changed. */ 428 if (again) 429 goto retry; 430 431 out: 432 kfree(rstamps); 433 return err; 434 } 435 436 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 437 struct snd_pcm_hw_params *params) 438 { 439 const struct snd_interval *i; 440 const struct snd_mask *m; 441 int err; 442 443 if (!params->msbits) { 444 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 445 if (snd_interval_single(i)) 446 params->msbits = snd_interval_value(i); 447 } 448 449 if (!params->rate_den) { 450 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 451 if (snd_interval_single(i)) { 452 params->rate_num = snd_interval_value(i); 453 params->rate_den = 1; 454 } 455 } 456 457 if (!params->fifo_size) { 458 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 459 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 460 if (snd_mask_single(m) && snd_interval_single(i)) { 461 err = snd_pcm_ops_ioctl(substream, 462 SNDRV_PCM_IOCTL1_FIFO_SIZE, 463 params); 464 if (err < 0) 465 return err; 466 } 467 } 468 469 if (!params->info) { 470 params->info = substream->runtime->hw.info; 471 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 472 SNDRV_PCM_INFO_DRAIN_TRIGGER); 473 if (!hw_support_mmap(substream)) 474 params->info &= ~(SNDRV_PCM_INFO_MMAP | 475 SNDRV_PCM_INFO_MMAP_VALID); 476 } 477 478 return 0; 479 } 480 481 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 482 struct snd_pcm_hw_params *params) 483 { 484 int err; 485 486 params->info = 0; 487 params->fifo_size = 0; 488 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 489 params->msbits = 0; 490 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 491 params->rate_num = 0; 492 params->rate_den = 0; 493 } 494 495 err = constrain_mask_params(substream, params); 496 if (err < 0) 497 return err; 498 499 err = constrain_interval_params(substream, params); 500 if (err < 0) 501 return err; 502 503 err = constrain_params_by_rules(substream, params); 504 if (err < 0) 505 return err; 506 507 params->rmask = 0; 508 509 return 0; 510 } 511 EXPORT_SYMBOL(snd_pcm_hw_refine); 512 513 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 514 struct snd_pcm_hw_params __user * _params) 515 { 516 struct snd_pcm_hw_params *params; 517 int err; 518 519 params = memdup_user(_params, sizeof(*params)); 520 if (IS_ERR(params)) 521 return PTR_ERR(params); 522 523 err = snd_pcm_hw_refine(substream, params); 524 if (err < 0) 525 goto end; 526 527 err = fixup_unreferenced_params(substream, params); 528 if (err < 0) 529 goto end; 530 531 if (copy_to_user(_params, params, sizeof(*params))) 532 err = -EFAULT; 533 end: 534 kfree(params); 535 return err; 536 } 537 538 static int period_to_usecs(struct snd_pcm_runtime *runtime) 539 { 540 int usecs; 541 542 if (! runtime->rate) 543 return -1; /* invalid */ 544 545 /* take 75% of period time as the deadline */ 546 usecs = (750000 / runtime->rate) * runtime->period_size; 547 usecs += ((750000 % runtime->rate) * runtime->period_size) / 548 runtime->rate; 549 550 return usecs; 551 } 552 553 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 554 { 555 snd_pcm_stream_lock_irq(substream); 556 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 557 substream->runtime->status->state = state; 558 snd_pcm_stream_unlock_irq(substream); 559 } 560 561 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 562 int event) 563 { 564 #ifdef CONFIG_SND_PCM_TIMER 565 if (substream->timer) 566 snd_timer_notify(substream->timer, event, 567 &substream->runtime->trigger_tstamp); 568 #endif 569 } 570 571 static void snd_pcm_sync_stop(struct snd_pcm_substream *substream) 572 { 573 if (substream->runtime->stop_operating) { 574 substream->runtime->stop_operating = false; 575 if (substream->ops->sync_stop) 576 substream->ops->sync_stop(substream); 577 else if (substream->pcm->card->sync_irq > 0) 578 synchronize_irq(substream->pcm->card->sync_irq); 579 } 580 } 581 582 /** 583 * snd_pcm_hw_param_choose - choose a configuration defined by @params 584 * @pcm: PCM instance 585 * @params: the hw_params instance 586 * 587 * Choose one configuration from configuration space defined by @params. 588 * The configuration chosen is that obtained fixing in this order: 589 * first access, first format, first subformat, min channels, 590 * min rate, min period time, max buffer size, min tick time 591 * 592 * Return: Zero if successful, or a negative error code on failure. 593 */ 594 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 595 struct snd_pcm_hw_params *params) 596 { 597 static const int vars[] = { 598 SNDRV_PCM_HW_PARAM_ACCESS, 599 SNDRV_PCM_HW_PARAM_FORMAT, 600 SNDRV_PCM_HW_PARAM_SUBFORMAT, 601 SNDRV_PCM_HW_PARAM_CHANNELS, 602 SNDRV_PCM_HW_PARAM_RATE, 603 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 604 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 605 SNDRV_PCM_HW_PARAM_TICK_TIME, 606 -1 607 }; 608 const int *v; 609 struct snd_mask old_mask; 610 struct snd_interval old_interval; 611 int changed; 612 613 for (v = vars; *v != -1; v++) { 614 /* Keep old parameter to trace. */ 615 if (trace_hw_mask_param_enabled()) { 616 if (hw_is_mask(*v)) 617 old_mask = *hw_param_mask(params, *v); 618 } 619 if (trace_hw_interval_param_enabled()) { 620 if (hw_is_interval(*v)) 621 old_interval = *hw_param_interval(params, *v); 622 } 623 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 624 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 625 else 626 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 627 if (changed < 0) 628 return changed; 629 if (changed == 0) 630 continue; 631 632 /* Trace the changed parameter. */ 633 if (hw_is_mask(*v)) { 634 trace_hw_mask_param(pcm, *v, 0, &old_mask, 635 hw_param_mask(params, *v)); 636 } 637 if (hw_is_interval(*v)) { 638 trace_hw_interval_param(pcm, *v, 0, &old_interval, 639 hw_param_interval(params, *v)); 640 } 641 } 642 643 return 0; 644 } 645 646 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 647 struct snd_pcm_hw_params *params) 648 { 649 struct snd_pcm_runtime *runtime; 650 int err, usecs; 651 unsigned int bits; 652 snd_pcm_uframes_t frames; 653 654 if (PCM_RUNTIME_CHECK(substream)) 655 return -ENXIO; 656 runtime = substream->runtime; 657 snd_pcm_stream_lock_irq(substream); 658 switch (runtime->status->state) { 659 case SNDRV_PCM_STATE_OPEN: 660 case SNDRV_PCM_STATE_SETUP: 661 case SNDRV_PCM_STATE_PREPARED: 662 break; 663 default: 664 snd_pcm_stream_unlock_irq(substream); 665 return -EBADFD; 666 } 667 snd_pcm_stream_unlock_irq(substream); 668 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 669 if (!substream->oss.oss) 670 #endif 671 if (atomic_read(&substream->mmap_count)) 672 return -EBADFD; 673 674 snd_pcm_sync_stop(substream); 675 676 params->rmask = ~0U; 677 err = snd_pcm_hw_refine(substream, params); 678 if (err < 0) 679 goto _error; 680 681 err = snd_pcm_hw_params_choose(substream, params); 682 if (err < 0) 683 goto _error; 684 685 err = fixup_unreferenced_params(substream, params); 686 if (err < 0) 687 goto _error; 688 689 if (substream->managed_buffer_alloc) { 690 err = snd_pcm_lib_malloc_pages(substream, 691 params_buffer_bytes(params)); 692 if (err < 0) 693 goto _error; 694 runtime->buffer_changed = err > 0; 695 } 696 697 if (substream->ops->hw_params != NULL) { 698 err = substream->ops->hw_params(substream, params); 699 if (err < 0) 700 goto _error; 701 } 702 703 runtime->access = params_access(params); 704 runtime->format = params_format(params); 705 runtime->subformat = params_subformat(params); 706 runtime->channels = params_channels(params); 707 runtime->rate = params_rate(params); 708 runtime->period_size = params_period_size(params); 709 runtime->periods = params_periods(params); 710 runtime->buffer_size = params_buffer_size(params); 711 runtime->info = params->info; 712 runtime->rate_num = params->rate_num; 713 runtime->rate_den = params->rate_den; 714 runtime->no_period_wakeup = 715 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 716 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 717 718 bits = snd_pcm_format_physical_width(runtime->format); 719 runtime->sample_bits = bits; 720 bits *= runtime->channels; 721 runtime->frame_bits = bits; 722 frames = 1; 723 while (bits % 8 != 0) { 724 bits *= 2; 725 frames *= 2; 726 } 727 runtime->byte_align = bits / 8; 728 runtime->min_align = frames; 729 730 /* Default sw params */ 731 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 732 runtime->period_step = 1; 733 runtime->control->avail_min = runtime->period_size; 734 runtime->start_threshold = 1; 735 runtime->stop_threshold = runtime->buffer_size; 736 runtime->silence_threshold = 0; 737 runtime->silence_size = 0; 738 runtime->boundary = runtime->buffer_size; 739 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 740 runtime->boundary *= 2; 741 742 snd_pcm_timer_resolution_change(substream); 743 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 744 745 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 746 pm_qos_remove_request(&substream->latency_pm_qos_req); 747 if ((usecs = period_to_usecs(runtime)) >= 0) 748 pm_qos_add_request(&substream->latency_pm_qos_req, 749 PM_QOS_CPU_DMA_LATENCY, usecs); 750 return 0; 751 _error: 752 /* hardware might be unusable from this time, 753 so we force application to retry to set 754 the correct hardware parameter settings */ 755 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 756 if (substream->ops->hw_free != NULL) 757 substream->ops->hw_free(substream); 758 if (substream->managed_buffer_alloc) 759 snd_pcm_lib_free_pages(substream); 760 return err; 761 } 762 763 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 764 struct snd_pcm_hw_params __user * _params) 765 { 766 struct snd_pcm_hw_params *params; 767 int err; 768 769 params = memdup_user(_params, sizeof(*params)); 770 if (IS_ERR(params)) 771 return PTR_ERR(params); 772 773 err = snd_pcm_hw_params(substream, params); 774 if (err < 0) 775 goto end; 776 777 if (copy_to_user(_params, params, sizeof(*params))) 778 err = -EFAULT; 779 end: 780 kfree(params); 781 return err; 782 } 783 784 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 785 { 786 struct snd_pcm_runtime *runtime; 787 int result = 0; 788 789 if (PCM_RUNTIME_CHECK(substream)) 790 return -ENXIO; 791 runtime = substream->runtime; 792 snd_pcm_stream_lock_irq(substream); 793 switch (runtime->status->state) { 794 case SNDRV_PCM_STATE_SETUP: 795 case SNDRV_PCM_STATE_PREPARED: 796 break; 797 default: 798 snd_pcm_stream_unlock_irq(substream); 799 return -EBADFD; 800 } 801 snd_pcm_stream_unlock_irq(substream); 802 if (atomic_read(&substream->mmap_count)) 803 return -EBADFD; 804 snd_pcm_sync_stop(substream); 805 if (substream->ops->hw_free) 806 result = substream->ops->hw_free(substream); 807 if (substream->managed_buffer_alloc) 808 snd_pcm_lib_free_pages(substream); 809 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 810 pm_qos_remove_request(&substream->latency_pm_qos_req); 811 return result; 812 } 813 814 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 815 struct snd_pcm_sw_params *params) 816 { 817 struct snd_pcm_runtime *runtime; 818 int err; 819 820 if (PCM_RUNTIME_CHECK(substream)) 821 return -ENXIO; 822 runtime = substream->runtime; 823 snd_pcm_stream_lock_irq(substream); 824 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 825 snd_pcm_stream_unlock_irq(substream); 826 return -EBADFD; 827 } 828 snd_pcm_stream_unlock_irq(substream); 829 830 if (params->tstamp_mode < 0 || 831 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 832 return -EINVAL; 833 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 834 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 835 return -EINVAL; 836 if (params->avail_min == 0) 837 return -EINVAL; 838 if (params->silence_size >= runtime->boundary) { 839 if (params->silence_threshold != 0) 840 return -EINVAL; 841 } else { 842 if (params->silence_size > params->silence_threshold) 843 return -EINVAL; 844 if (params->silence_threshold > runtime->buffer_size) 845 return -EINVAL; 846 } 847 err = 0; 848 snd_pcm_stream_lock_irq(substream); 849 runtime->tstamp_mode = params->tstamp_mode; 850 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 851 runtime->tstamp_type = params->tstamp_type; 852 runtime->period_step = params->period_step; 853 runtime->control->avail_min = params->avail_min; 854 runtime->start_threshold = params->start_threshold; 855 runtime->stop_threshold = params->stop_threshold; 856 runtime->silence_threshold = params->silence_threshold; 857 runtime->silence_size = params->silence_size; 858 params->boundary = runtime->boundary; 859 if (snd_pcm_running(substream)) { 860 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 861 runtime->silence_size > 0) 862 snd_pcm_playback_silence(substream, ULONG_MAX); 863 err = snd_pcm_update_state(substream, runtime); 864 } 865 snd_pcm_stream_unlock_irq(substream); 866 return err; 867 } 868 869 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 870 struct snd_pcm_sw_params __user * _params) 871 { 872 struct snd_pcm_sw_params params; 873 int err; 874 if (copy_from_user(¶ms, _params, sizeof(params))) 875 return -EFAULT; 876 err = snd_pcm_sw_params(substream, ¶ms); 877 if (copy_to_user(_params, ¶ms, sizeof(params))) 878 return -EFAULT; 879 return err; 880 } 881 882 static inline snd_pcm_uframes_t 883 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 884 { 885 snd_pcm_uframes_t delay; 886 887 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 888 delay = snd_pcm_playback_hw_avail(substream->runtime); 889 else 890 delay = snd_pcm_capture_avail(substream->runtime); 891 return delay + substream->runtime->delay; 892 } 893 894 int snd_pcm_status(struct snd_pcm_substream *substream, 895 struct snd_pcm_status *status) 896 { 897 struct snd_pcm_runtime *runtime = substream->runtime; 898 899 snd_pcm_stream_lock_irq(substream); 900 901 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 902 &runtime->audio_tstamp_config); 903 904 /* backwards compatible behavior */ 905 if (runtime->audio_tstamp_config.type_requested == 906 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 907 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 908 runtime->audio_tstamp_config.type_requested = 909 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 910 else 911 runtime->audio_tstamp_config.type_requested = 912 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 913 runtime->audio_tstamp_report.valid = 0; 914 } else 915 runtime->audio_tstamp_report.valid = 1; 916 917 status->state = runtime->status->state; 918 status->suspended_state = runtime->status->suspended_state; 919 if (status->state == SNDRV_PCM_STATE_OPEN) 920 goto _end; 921 status->trigger_tstamp = runtime->trigger_tstamp; 922 if (snd_pcm_running(substream)) { 923 snd_pcm_update_hw_ptr(substream); 924 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 925 status->tstamp = runtime->status->tstamp; 926 status->driver_tstamp = runtime->driver_tstamp; 927 status->audio_tstamp = 928 runtime->status->audio_tstamp; 929 if (runtime->audio_tstamp_report.valid == 1) 930 /* backwards compatibility, no report provided in COMPAT mode */ 931 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 932 &status->audio_tstamp_accuracy, 933 &runtime->audio_tstamp_report); 934 935 goto _tstamp_end; 936 } 937 } else { 938 /* get tstamp only in fallback mode and only if enabled */ 939 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 940 snd_pcm_gettime(runtime, &status->tstamp); 941 } 942 _tstamp_end: 943 status->appl_ptr = runtime->control->appl_ptr; 944 status->hw_ptr = runtime->status->hw_ptr; 945 status->avail = snd_pcm_avail(substream); 946 status->delay = snd_pcm_running(substream) ? 947 snd_pcm_calc_delay(substream) : 0; 948 status->avail_max = runtime->avail_max; 949 status->overrange = runtime->overrange; 950 runtime->avail_max = 0; 951 runtime->overrange = 0; 952 _end: 953 snd_pcm_stream_unlock_irq(substream); 954 return 0; 955 } 956 957 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 958 struct snd_pcm_status __user * _status, 959 bool ext) 960 { 961 struct snd_pcm_status status; 962 int res; 963 964 memset(&status, 0, sizeof(status)); 965 /* 966 * with extension, parameters are read/write, 967 * get audio_tstamp_data from user, 968 * ignore rest of status structure 969 */ 970 if (ext && get_user(status.audio_tstamp_data, 971 (u32 __user *)(&_status->audio_tstamp_data))) 972 return -EFAULT; 973 res = snd_pcm_status(substream, &status); 974 if (res < 0) 975 return res; 976 if (copy_to_user(_status, &status, sizeof(status))) 977 return -EFAULT; 978 return 0; 979 } 980 981 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 982 struct snd_pcm_channel_info * info) 983 { 984 struct snd_pcm_runtime *runtime; 985 unsigned int channel; 986 987 channel = info->channel; 988 runtime = substream->runtime; 989 snd_pcm_stream_lock_irq(substream); 990 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 991 snd_pcm_stream_unlock_irq(substream); 992 return -EBADFD; 993 } 994 snd_pcm_stream_unlock_irq(substream); 995 if (channel >= runtime->channels) 996 return -EINVAL; 997 memset(info, 0, sizeof(*info)); 998 info->channel = channel; 999 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 1000 } 1001 1002 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 1003 struct snd_pcm_channel_info __user * _info) 1004 { 1005 struct snd_pcm_channel_info info; 1006 int res; 1007 1008 if (copy_from_user(&info, _info, sizeof(info))) 1009 return -EFAULT; 1010 res = snd_pcm_channel_info(substream, &info); 1011 if (res < 0) 1012 return res; 1013 if (copy_to_user(_info, &info, sizeof(info))) 1014 return -EFAULT; 1015 return 0; 1016 } 1017 1018 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 1019 { 1020 struct snd_pcm_runtime *runtime = substream->runtime; 1021 if (runtime->trigger_master == NULL) 1022 return; 1023 if (runtime->trigger_master == substream) { 1024 if (!runtime->trigger_tstamp_latched) 1025 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1026 } else { 1027 snd_pcm_trigger_tstamp(runtime->trigger_master); 1028 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1029 } 1030 runtime->trigger_master = NULL; 1031 } 1032 1033 struct action_ops { 1034 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1035 int (*do_action)(struct snd_pcm_substream *substream, int state); 1036 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1037 void (*post_action)(struct snd_pcm_substream *substream, int state); 1038 }; 1039 1040 /* 1041 * this functions is core for handling of linked stream 1042 * Note: the stream state might be changed also on failure 1043 * Note2: call with calling stream lock + link lock 1044 */ 1045 static int snd_pcm_action_group(const struct action_ops *ops, 1046 struct snd_pcm_substream *substream, 1047 int state, int do_lock) 1048 { 1049 struct snd_pcm_substream *s = NULL; 1050 struct snd_pcm_substream *s1; 1051 int res = 0, depth = 1; 1052 1053 snd_pcm_group_for_each_entry(s, substream) { 1054 if (do_lock && s != substream) { 1055 if (s->pcm->nonatomic) 1056 mutex_lock_nested(&s->self_group.mutex, depth); 1057 else 1058 spin_lock_nested(&s->self_group.lock, depth); 1059 depth++; 1060 } 1061 res = ops->pre_action(s, state); 1062 if (res < 0) 1063 goto _unlock; 1064 } 1065 snd_pcm_group_for_each_entry(s, substream) { 1066 res = ops->do_action(s, state); 1067 if (res < 0) { 1068 if (ops->undo_action) { 1069 snd_pcm_group_for_each_entry(s1, substream) { 1070 if (s1 == s) /* failed stream */ 1071 break; 1072 ops->undo_action(s1, state); 1073 } 1074 } 1075 s = NULL; /* unlock all */ 1076 goto _unlock; 1077 } 1078 } 1079 snd_pcm_group_for_each_entry(s, substream) { 1080 ops->post_action(s, state); 1081 } 1082 _unlock: 1083 if (do_lock) { 1084 /* unlock streams */ 1085 snd_pcm_group_for_each_entry(s1, substream) { 1086 if (s1 != substream) { 1087 if (s1->pcm->nonatomic) 1088 mutex_unlock(&s1->self_group.mutex); 1089 else 1090 spin_unlock(&s1->self_group.lock); 1091 } 1092 if (s1 == s) /* end */ 1093 break; 1094 } 1095 } 1096 return res; 1097 } 1098 1099 /* 1100 * Note: call with stream lock 1101 */ 1102 static int snd_pcm_action_single(const struct action_ops *ops, 1103 struct snd_pcm_substream *substream, 1104 int state) 1105 { 1106 int res; 1107 1108 res = ops->pre_action(substream, state); 1109 if (res < 0) 1110 return res; 1111 res = ops->do_action(substream, state); 1112 if (res == 0) 1113 ops->post_action(substream, state); 1114 else if (ops->undo_action) 1115 ops->undo_action(substream, state); 1116 return res; 1117 } 1118 1119 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1120 struct snd_pcm_group *new_group) 1121 { 1122 substream->group = new_group; 1123 list_move(&substream->link_list, &new_group->substreams); 1124 } 1125 1126 /* 1127 * Unref and unlock the group, but keep the stream lock; 1128 * when the group becomes empty and no longer referred, destroy itself 1129 */ 1130 static void snd_pcm_group_unref(struct snd_pcm_group *group, 1131 struct snd_pcm_substream *substream) 1132 { 1133 bool do_free; 1134 1135 if (!group) 1136 return; 1137 do_free = refcount_dec_and_test(&group->refs); 1138 snd_pcm_group_unlock(group, substream->pcm->nonatomic); 1139 if (do_free) 1140 kfree(group); 1141 } 1142 1143 /* 1144 * Lock the group inside a stream lock and reference it; 1145 * return the locked group object, or NULL if not linked 1146 */ 1147 static struct snd_pcm_group * 1148 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) 1149 { 1150 bool nonatomic = substream->pcm->nonatomic; 1151 struct snd_pcm_group *group; 1152 bool trylock; 1153 1154 for (;;) { 1155 if (!snd_pcm_stream_linked(substream)) 1156 return NULL; 1157 group = substream->group; 1158 /* block freeing the group object */ 1159 refcount_inc(&group->refs); 1160 1161 trylock = nonatomic ? mutex_trylock(&group->mutex) : 1162 spin_trylock(&group->lock); 1163 if (trylock) 1164 break; /* OK */ 1165 1166 /* re-lock for avoiding ABBA deadlock */ 1167 snd_pcm_stream_unlock(substream); 1168 snd_pcm_group_lock(group, nonatomic); 1169 snd_pcm_stream_lock(substream); 1170 1171 /* check the group again; the above opens a small race window */ 1172 if (substream->group == group) 1173 break; /* OK */ 1174 /* group changed, try again */ 1175 snd_pcm_group_unref(group, substream); 1176 } 1177 return group; 1178 } 1179 1180 /* 1181 * Note: call with stream lock 1182 */ 1183 static int snd_pcm_action(const struct action_ops *ops, 1184 struct snd_pcm_substream *substream, 1185 int state) 1186 { 1187 struct snd_pcm_group *group; 1188 int res; 1189 1190 group = snd_pcm_stream_group_ref(substream); 1191 if (group) 1192 res = snd_pcm_action_group(ops, substream, state, 1); 1193 else 1194 res = snd_pcm_action_single(ops, substream, state); 1195 snd_pcm_group_unref(group, substream); 1196 return res; 1197 } 1198 1199 /* 1200 * Note: don't use any locks before 1201 */ 1202 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1203 struct snd_pcm_substream *substream, 1204 int state) 1205 { 1206 int res; 1207 1208 snd_pcm_stream_lock_irq(substream); 1209 res = snd_pcm_action(ops, substream, state); 1210 snd_pcm_stream_unlock_irq(substream); 1211 return res; 1212 } 1213 1214 /* 1215 */ 1216 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1217 struct snd_pcm_substream *substream, 1218 int state) 1219 { 1220 int res; 1221 1222 /* Guarantee the group members won't change during non-atomic action */ 1223 down_read(&snd_pcm_link_rwsem); 1224 if (snd_pcm_stream_linked(substream)) 1225 res = snd_pcm_action_group(ops, substream, state, 0); 1226 else 1227 res = snd_pcm_action_single(ops, substream, state); 1228 up_read(&snd_pcm_link_rwsem); 1229 return res; 1230 } 1231 1232 /* 1233 * start callbacks 1234 */ 1235 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1236 { 1237 struct snd_pcm_runtime *runtime = substream->runtime; 1238 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1239 return -EBADFD; 1240 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1241 !snd_pcm_playback_data(substream)) 1242 return -EPIPE; 1243 runtime->trigger_tstamp_latched = false; 1244 runtime->trigger_master = substream; 1245 return 0; 1246 } 1247 1248 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1249 { 1250 if (substream->runtime->trigger_master != substream) 1251 return 0; 1252 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1253 } 1254 1255 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1256 { 1257 if (substream->runtime->trigger_master == substream) 1258 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1259 } 1260 1261 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1262 { 1263 struct snd_pcm_runtime *runtime = substream->runtime; 1264 snd_pcm_trigger_tstamp(substream); 1265 runtime->hw_ptr_jiffies = jiffies; 1266 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1267 runtime->rate; 1268 runtime->status->state = state; 1269 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1270 runtime->silence_size > 0) 1271 snd_pcm_playback_silence(substream, ULONG_MAX); 1272 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1273 } 1274 1275 static const struct action_ops snd_pcm_action_start = { 1276 .pre_action = snd_pcm_pre_start, 1277 .do_action = snd_pcm_do_start, 1278 .undo_action = snd_pcm_undo_start, 1279 .post_action = snd_pcm_post_start 1280 }; 1281 1282 /** 1283 * snd_pcm_start - start all linked streams 1284 * @substream: the PCM substream instance 1285 * 1286 * Return: Zero if successful, or a negative error code. 1287 * The stream lock must be acquired before calling this function. 1288 */ 1289 int snd_pcm_start(struct snd_pcm_substream *substream) 1290 { 1291 return snd_pcm_action(&snd_pcm_action_start, substream, 1292 SNDRV_PCM_STATE_RUNNING); 1293 } 1294 1295 /* take the stream lock and start the streams */ 1296 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1297 { 1298 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1299 SNDRV_PCM_STATE_RUNNING); 1300 } 1301 1302 /* 1303 * stop callbacks 1304 */ 1305 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1306 { 1307 struct snd_pcm_runtime *runtime = substream->runtime; 1308 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1309 return -EBADFD; 1310 runtime->trigger_master = substream; 1311 return 0; 1312 } 1313 1314 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1315 { 1316 if (substream->runtime->trigger_master == substream && 1317 snd_pcm_running(substream)) 1318 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1319 return 0; /* unconditonally stop all substreams */ 1320 } 1321 1322 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1323 { 1324 struct snd_pcm_runtime *runtime = substream->runtime; 1325 if (runtime->status->state != state) { 1326 snd_pcm_trigger_tstamp(substream); 1327 runtime->status->state = state; 1328 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1329 } 1330 runtime->stop_operating = true; 1331 wake_up(&runtime->sleep); 1332 wake_up(&runtime->tsleep); 1333 } 1334 1335 static const struct action_ops snd_pcm_action_stop = { 1336 .pre_action = snd_pcm_pre_stop, 1337 .do_action = snd_pcm_do_stop, 1338 .post_action = snd_pcm_post_stop 1339 }; 1340 1341 /** 1342 * snd_pcm_stop - try to stop all running streams in the substream group 1343 * @substream: the PCM substream instance 1344 * @state: PCM state after stopping the stream 1345 * 1346 * The state of each stream is then changed to the given state unconditionally. 1347 * 1348 * Return: Zero if successful, or a negative error code. 1349 */ 1350 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1351 { 1352 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1353 } 1354 EXPORT_SYMBOL(snd_pcm_stop); 1355 1356 /** 1357 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1358 * @substream: the PCM substream 1359 * 1360 * After stopping, the state is changed to SETUP. 1361 * Unlike snd_pcm_stop(), this affects only the given stream. 1362 * 1363 * Return: Zero if succesful, or a negative error code. 1364 */ 1365 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1366 { 1367 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1368 SNDRV_PCM_STATE_SETUP); 1369 } 1370 1371 /** 1372 * snd_pcm_stop_xrun - stop the running streams as XRUN 1373 * @substream: the PCM substream instance 1374 * 1375 * This stops the given running substream (and all linked substreams) as XRUN. 1376 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1377 * 1378 * Return: Zero if successful, or a negative error code. 1379 */ 1380 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1381 { 1382 unsigned long flags; 1383 1384 snd_pcm_stream_lock_irqsave(substream, flags); 1385 if (substream->runtime && snd_pcm_running(substream)) 1386 __snd_pcm_xrun(substream); 1387 snd_pcm_stream_unlock_irqrestore(substream, flags); 1388 return 0; 1389 } 1390 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1391 1392 /* 1393 * pause callbacks 1394 */ 1395 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1396 { 1397 struct snd_pcm_runtime *runtime = substream->runtime; 1398 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1399 return -ENOSYS; 1400 if (push) { 1401 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1402 return -EBADFD; 1403 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1404 return -EBADFD; 1405 runtime->trigger_master = substream; 1406 return 0; 1407 } 1408 1409 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1410 { 1411 if (substream->runtime->trigger_master != substream) 1412 return 0; 1413 /* some drivers might use hw_ptr to recover from the pause - 1414 update the hw_ptr now */ 1415 if (push) 1416 snd_pcm_update_hw_ptr(substream); 1417 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1418 * a delta between the current jiffies, this gives a large enough 1419 * delta, effectively to skip the check once. 1420 */ 1421 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1422 return substream->ops->trigger(substream, 1423 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1424 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1425 } 1426 1427 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1428 { 1429 if (substream->runtime->trigger_master == substream) 1430 substream->ops->trigger(substream, 1431 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1432 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1433 } 1434 1435 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1436 { 1437 struct snd_pcm_runtime *runtime = substream->runtime; 1438 snd_pcm_trigger_tstamp(substream); 1439 if (push) { 1440 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1441 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1442 wake_up(&runtime->sleep); 1443 wake_up(&runtime->tsleep); 1444 } else { 1445 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1446 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1447 } 1448 } 1449 1450 static const struct action_ops snd_pcm_action_pause = { 1451 .pre_action = snd_pcm_pre_pause, 1452 .do_action = snd_pcm_do_pause, 1453 .undo_action = snd_pcm_undo_pause, 1454 .post_action = snd_pcm_post_pause 1455 }; 1456 1457 /* 1458 * Push/release the pause for all linked streams. 1459 */ 1460 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1461 { 1462 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1463 } 1464 1465 #ifdef CONFIG_PM 1466 /* suspend */ 1467 1468 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1469 { 1470 struct snd_pcm_runtime *runtime = substream->runtime; 1471 switch (runtime->status->state) { 1472 case SNDRV_PCM_STATE_SUSPENDED: 1473 return -EBUSY; 1474 /* unresumable PCM state; return -EBUSY for skipping suspend */ 1475 case SNDRV_PCM_STATE_OPEN: 1476 case SNDRV_PCM_STATE_SETUP: 1477 case SNDRV_PCM_STATE_DISCONNECTED: 1478 return -EBUSY; 1479 } 1480 runtime->trigger_master = substream; 1481 return 0; 1482 } 1483 1484 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1485 { 1486 struct snd_pcm_runtime *runtime = substream->runtime; 1487 if (runtime->trigger_master != substream) 1488 return 0; 1489 if (! snd_pcm_running(substream)) 1490 return 0; 1491 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1492 return 0; /* suspend unconditionally */ 1493 } 1494 1495 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1496 { 1497 struct snd_pcm_runtime *runtime = substream->runtime; 1498 snd_pcm_trigger_tstamp(substream); 1499 runtime->status->suspended_state = runtime->status->state; 1500 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1501 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1502 wake_up(&runtime->sleep); 1503 wake_up(&runtime->tsleep); 1504 } 1505 1506 static const struct action_ops snd_pcm_action_suspend = { 1507 .pre_action = snd_pcm_pre_suspend, 1508 .do_action = snd_pcm_do_suspend, 1509 .post_action = snd_pcm_post_suspend 1510 }; 1511 1512 /* 1513 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1514 * @substream: the PCM substream 1515 * 1516 * After this call, all streams are changed to SUSPENDED state. 1517 * 1518 * Return: Zero if successful, or a negative error code. 1519 */ 1520 static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1521 { 1522 int err; 1523 unsigned long flags; 1524 1525 snd_pcm_stream_lock_irqsave(substream, flags); 1526 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1527 snd_pcm_stream_unlock_irqrestore(substream, flags); 1528 return err; 1529 } 1530 1531 /** 1532 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1533 * @pcm: the PCM instance 1534 * 1535 * After this call, all streams are changed to SUSPENDED state. 1536 * 1537 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1538 */ 1539 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1540 { 1541 struct snd_pcm_substream *substream; 1542 int stream, err = 0; 1543 1544 if (! pcm) 1545 return 0; 1546 1547 for (stream = 0; stream < 2; stream++) { 1548 for (substream = pcm->streams[stream].substream; 1549 substream; substream = substream->next) { 1550 /* FIXME: the open/close code should lock this as well */ 1551 if (substream->runtime == NULL) 1552 continue; 1553 1554 /* 1555 * Skip BE dai link PCM's that are internal and may 1556 * not have their substream ops set. 1557 */ 1558 if (!substream->ops) 1559 continue; 1560 1561 err = snd_pcm_suspend(substream); 1562 if (err < 0 && err != -EBUSY) 1563 return err; 1564 } 1565 } 1566 return 0; 1567 } 1568 EXPORT_SYMBOL(snd_pcm_suspend_all); 1569 1570 /* resume */ 1571 1572 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1573 { 1574 struct snd_pcm_runtime *runtime = substream->runtime; 1575 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1576 return -ENOSYS; 1577 runtime->trigger_master = substream; 1578 return 0; 1579 } 1580 1581 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1582 { 1583 struct snd_pcm_runtime *runtime = substream->runtime; 1584 if (runtime->trigger_master != substream) 1585 return 0; 1586 /* DMA not running previously? */ 1587 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1588 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1589 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1590 return 0; 1591 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1592 } 1593 1594 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1595 { 1596 if (substream->runtime->trigger_master == substream && 1597 snd_pcm_running(substream)) 1598 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1599 } 1600 1601 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1602 { 1603 struct snd_pcm_runtime *runtime = substream->runtime; 1604 snd_pcm_trigger_tstamp(substream); 1605 runtime->status->state = runtime->status->suspended_state; 1606 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1607 snd_pcm_sync_stop(substream); 1608 } 1609 1610 static const struct action_ops snd_pcm_action_resume = { 1611 .pre_action = snd_pcm_pre_resume, 1612 .do_action = snd_pcm_do_resume, 1613 .undo_action = snd_pcm_undo_resume, 1614 .post_action = snd_pcm_post_resume 1615 }; 1616 1617 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1618 { 1619 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1620 } 1621 1622 #else 1623 1624 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1625 { 1626 return -ENOSYS; 1627 } 1628 1629 #endif /* CONFIG_PM */ 1630 1631 /* 1632 * xrun ioctl 1633 * 1634 * Change the RUNNING stream(s) to XRUN state. 1635 */ 1636 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1637 { 1638 struct snd_pcm_runtime *runtime = substream->runtime; 1639 int result; 1640 1641 snd_pcm_stream_lock_irq(substream); 1642 switch (runtime->status->state) { 1643 case SNDRV_PCM_STATE_XRUN: 1644 result = 0; /* already there */ 1645 break; 1646 case SNDRV_PCM_STATE_RUNNING: 1647 __snd_pcm_xrun(substream); 1648 result = 0; 1649 break; 1650 default: 1651 result = -EBADFD; 1652 } 1653 snd_pcm_stream_unlock_irq(substream); 1654 return result; 1655 } 1656 1657 /* 1658 * reset ioctl 1659 */ 1660 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1661 { 1662 struct snd_pcm_runtime *runtime = substream->runtime; 1663 switch (runtime->status->state) { 1664 case SNDRV_PCM_STATE_RUNNING: 1665 case SNDRV_PCM_STATE_PREPARED: 1666 case SNDRV_PCM_STATE_PAUSED: 1667 case SNDRV_PCM_STATE_SUSPENDED: 1668 return 0; 1669 default: 1670 return -EBADFD; 1671 } 1672 } 1673 1674 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1675 { 1676 struct snd_pcm_runtime *runtime = substream->runtime; 1677 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1678 if (err < 0) 1679 return err; 1680 runtime->hw_ptr_base = 0; 1681 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1682 runtime->status->hw_ptr % runtime->period_size; 1683 runtime->silence_start = runtime->status->hw_ptr; 1684 runtime->silence_filled = 0; 1685 return 0; 1686 } 1687 1688 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1689 { 1690 struct snd_pcm_runtime *runtime = substream->runtime; 1691 runtime->control->appl_ptr = runtime->status->hw_ptr; 1692 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1693 runtime->silence_size > 0) 1694 snd_pcm_playback_silence(substream, ULONG_MAX); 1695 } 1696 1697 static const struct action_ops snd_pcm_action_reset = { 1698 .pre_action = snd_pcm_pre_reset, 1699 .do_action = snd_pcm_do_reset, 1700 .post_action = snd_pcm_post_reset 1701 }; 1702 1703 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1704 { 1705 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1706 } 1707 1708 /* 1709 * prepare ioctl 1710 */ 1711 /* we use the second argument for updating f_flags */ 1712 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1713 int f_flags) 1714 { 1715 struct snd_pcm_runtime *runtime = substream->runtime; 1716 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1717 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1718 return -EBADFD; 1719 if (snd_pcm_running(substream)) 1720 return -EBUSY; 1721 substream->f_flags = f_flags; 1722 return 0; 1723 } 1724 1725 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1726 { 1727 int err; 1728 snd_pcm_sync_stop(substream); 1729 err = substream->ops->prepare(substream); 1730 if (err < 0) 1731 return err; 1732 return snd_pcm_do_reset(substream, 0); 1733 } 1734 1735 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1736 { 1737 struct snd_pcm_runtime *runtime = substream->runtime; 1738 runtime->control->appl_ptr = runtime->status->hw_ptr; 1739 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1740 } 1741 1742 static const struct action_ops snd_pcm_action_prepare = { 1743 .pre_action = snd_pcm_pre_prepare, 1744 .do_action = snd_pcm_do_prepare, 1745 .post_action = snd_pcm_post_prepare 1746 }; 1747 1748 /** 1749 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1750 * @substream: the PCM substream instance 1751 * @file: file to refer f_flags 1752 * 1753 * Return: Zero if successful, or a negative error code. 1754 */ 1755 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1756 struct file *file) 1757 { 1758 int f_flags; 1759 1760 if (file) 1761 f_flags = file->f_flags; 1762 else 1763 f_flags = substream->f_flags; 1764 1765 snd_pcm_stream_lock_irq(substream); 1766 switch (substream->runtime->status->state) { 1767 case SNDRV_PCM_STATE_PAUSED: 1768 snd_pcm_pause(substream, 0); 1769 /* fallthru */ 1770 case SNDRV_PCM_STATE_SUSPENDED: 1771 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1772 break; 1773 } 1774 snd_pcm_stream_unlock_irq(substream); 1775 1776 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1777 substream, f_flags); 1778 } 1779 1780 /* 1781 * drain ioctl 1782 */ 1783 1784 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1785 { 1786 struct snd_pcm_runtime *runtime = substream->runtime; 1787 switch (runtime->status->state) { 1788 case SNDRV_PCM_STATE_OPEN: 1789 case SNDRV_PCM_STATE_DISCONNECTED: 1790 case SNDRV_PCM_STATE_SUSPENDED: 1791 return -EBADFD; 1792 } 1793 runtime->trigger_master = substream; 1794 return 0; 1795 } 1796 1797 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1798 { 1799 struct snd_pcm_runtime *runtime = substream->runtime; 1800 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1801 switch (runtime->status->state) { 1802 case SNDRV_PCM_STATE_PREPARED: 1803 /* start playback stream if possible */ 1804 if (! snd_pcm_playback_empty(substream)) { 1805 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1806 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1807 } else { 1808 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1809 } 1810 break; 1811 case SNDRV_PCM_STATE_RUNNING: 1812 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1813 break; 1814 case SNDRV_PCM_STATE_XRUN: 1815 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1816 break; 1817 default: 1818 break; 1819 } 1820 } else { 1821 /* stop running stream */ 1822 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1823 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1824 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1825 snd_pcm_do_stop(substream, new_state); 1826 snd_pcm_post_stop(substream, new_state); 1827 } 1828 } 1829 1830 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1831 runtime->trigger_master == substream && 1832 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1833 return substream->ops->trigger(substream, 1834 SNDRV_PCM_TRIGGER_DRAIN); 1835 1836 return 0; 1837 } 1838 1839 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1840 { 1841 } 1842 1843 static const struct action_ops snd_pcm_action_drain_init = { 1844 .pre_action = snd_pcm_pre_drain_init, 1845 .do_action = snd_pcm_do_drain_init, 1846 .post_action = snd_pcm_post_drain_init 1847 }; 1848 1849 /* 1850 * Drain the stream(s). 1851 * When the substream is linked, sync until the draining of all playback streams 1852 * is finished. 1853 * After this call, all streams are supposed to be either SETUP or DRAINING 1854 * (capture only) state. 1855 */ 1856 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1857 struct file *file) 1858 { 1859 struct snd_card *card; 1860 struct snd_pcm_runtime *runtime; 1861 struct snd_pcm_substream *s; 1862 struct snd_pcm_group *group; 1863 wait_queue_entry_t wait; 1864 int result = 0; 1865 int nonblock = 0; 1866 1867 card = substream->pcm->card; 1868 runtime = substream->runtime; 1869 1870 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1871 return -EBADFD; 1872 1873 if (file) { 1874 if (file->f_flags & O_NONBLOCK) 1875 nonblock = 1; 1876 } else if (substream->f_flags & O_NONBLOCK) 1877 nonblock = 1; 1878 1879 snd_pcm_stream_lock_irq(substream); 1880 /* resume pause */ 1881 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1882 snd_pcm_pause(substream, 0); 1883 1884 /* pre-start/stop - all running streams are changed to DRAINING state */ 1885 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1886 if (result < 0) 1887 goto unlock; 1888 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1889 if (nonblock) { 1890 result = -EAGAIN; 1891 goto unlock; 1892 } 1893 1894 for (;;) { 1895 long tout; 1896 struct snd_pcm_runtime *to_check; 1897 if (signal_pending(current)) { 1898 result = -ERESTARTSYS; 1899 break; 1900 } 1901 /* find a substream to drain */ 1902 to_check = NULL; 1903 group = snd_pcm_stream_group_ref(substream); 1904 snd_pcm_group_for_each_entry(s, substream) { 1905 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1906 continue; 1907 runtime = s->runtime; 1908 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1909 to_check = runtime; 1910 break; 1911 } 1912 } 1913 snd_pcm_group_unref(group, substream); 1914 if (!to_check) 1915 break; /* all drained */ 1916 init_waitqueue_entry(&wait, current); 1917 set_current_state(TASK_INTERRUPTIBLE); 1918 add_wait_queue(&to_check->sleep, &wait); 1919 snd_pcm_stream_unlock_irq(substream); 1920 if (runtime->no_period_wakeup) 1921 tout = MAX_SCHEDULE_TIMEOUT; 1922 else { 1923 tout = 10; 1924 if (runtime->rate) { 1925 long t = runtime->period_size * 2 / runtime->rate; 1926 tout = max(t, tout); 1927 } 1928 tout = msecs_to_jiffies(tout * 1000); 1929 } 1930 tout = schedule_timeout(tout); 1931 1932 snd_pcm_stream_lock_irq(substream); 1933 group = snd_pcm_stream_group_ref(substream); 1934 snd_pcm_group_for_each_entry(s, substream) { 1935 if (s->runtime == to_check) { 1936 remove_wait_queue(&to_check->sleep, &wait); 1937 break; 1938 } 1939 } 1940 snd_pcm_group_unref(group, substream); 1941 1942 if (card->shutdown) { 1943 result = -ENODEV; 1944 break; 1945 } 1946 if (tout == 0) { 1947 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1948 result = -ESTRPIPE; 1949 else { 1950 dev_dbg(substream->pcm->card->dev, 1951 "playback drain error (DMA or IRQ trouble?)\n"); 1952 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1953 result = -EIO; 1954 } 1955 break; 1956 } 1957 } 1958 1959 unlock: 1960 snd_pcm_stream_unlock_irq(substream); 1961 1962 return result; 1963 } 1964 1965 /* 1966 * drop ioctl 1967 * 1968 * Immediately put all linked substreams into SETUP state. 1969 */ 1970 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1971 { 1972 struct snd_pcm_runtime *runtime; 1973 int result = 0; 1974 1975 if (PCM_RUNTIME_CHECK(substream)) 1976 return -ENXIO; 1977 runtime = substream->runtime; 1978 1979 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1980 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1981 return -EBADFD; 1982 1983 snd_pcm_stream_lock_irq(substream); 1984 /* resume pause */ 1985 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1986 snd_pcm_pause(substream, 0); 1987 1988 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1989 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1990 snd_pcm_stream_unlock_irq(substream); 1991 1992 return result; 1993 } 1994 1995 1996 static bool is_pcm_file(struct file *file) 1997 { 1998 struct inode *inode = file_inode(file); 1999 struct snd_pcm *pcm; 2000 unsigned int minor; 2001 2002 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 2003 return false; 2004 minor = iminor(inode); 2005 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2006 if (!pcm) 2007 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2008 if (!pcm) 2009 return false; 2010 snd_card_unref(pcm->card); 2011 return true; 2012 } 2013 2014 /* 2015 * PCM link handling 2016 */ 2017 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 2018 { 2019 int res = 0; 2020 struct snd_pcm_file *pcm_file; 2021 struct snd_pcm_substream *substream1; 2022 struct snd_pcm_group *group, *target_group; 2023 bool nonatomic = substream->pcm->nonatomic; 2024 struct fd f = fdget(fd); 2025 2026 if (!f.file) 2027 return -EBADFD; 2028 if (!is_pcm_file(f.file)) { 2029 res = -EBADFD; 2030 goto _badf; 2031 } 2032 pcm_file = f.file->private_data; 2033 substream1 = pcm_file->substream; 2034 group = kzalloc(sizeof(*group), GFP_KERNEL); 2035 if (!group) { 2036 res = -ENOMEM; 2037 goto _nolock; 2038 } 2039 snd_pcm_group_init(group); 2040 2041 down_write(&snd_pcm_link_rwsem); 2042 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 2043 substream->runtime->status->state != substream1->runtime->status->state || 2044 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2045 res = -EBADFD; 2046 goto _end; 2047 } 2048 if (snd_pcm_stream_linked(substream1)) { 2049 res = -EALREADY; 2050 goto _end; 2051 } 2052 2053 snd_pcm_stream_lock_irq(substream); 2054 if (!snd_pcm_stream_linked(substream)) { 2055 snd_pcm_group_assign(substream, group); 2056 group = NULL; /* assigned, don't free this one below */ 2057 } 2058 target_group = substream->group; 2059 snd_pcm_stream_unlock_irq(substream); 2060 2061 snd_pcm_group_lock_irq(target_group, nonatomic); 2062 snd_pcm_stream_lock(substream1); 2063 snd_pcm_group_assign(substream1, target_group); 2064 refcount_inc(&target_group->refs); 2065 snd_pcm_stream_unlock(substream1); 2066 snd_pcm_group_unlock_irq(target_group, nonatomic); 2067 _end: 2068 up_write(&snd_pcm_link_rwsem); 2069 _nolock: 2070 kfree(group); 2071 _badf: 2072 fdput(f); 2073 return res; 2074 } 2075 2076 static void relink_to_local(struct snd_pcm_substream *substream) 2077 { 2078 snd_pcm_stream_lock(substream); 2079 snd_pcm_group_assign(substream, &substream->self_group); 2080 snd_pcm_stream_unlock(substream); 2081 } 2082 2083 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2084 { 2085 struct snd_pcm_group *group; 2086 bool nonatomic = substream->pcm->nonatomic; 2087 bool do_free = false; 2088 int res = 0; 2089 2090 down_write(&snd_pcm_link_rwsem); 2091 2092 if (!snd_pcm_stream_linked(substream)) { 2093 res = -EALREADY; 2094 goto _end; 2095 } 2096 2097 group = substream->group; 2098 snd_pcm_group_lock_irq(group, nonatomic); 2099 2100 relink_to_local(substream); 2101 refcount_dec(&group->refs); 2102 2103 /* detach the last stream, too */ 2104 if (list_is_singular(&group->substreams)) { 2105 relink_to_local(list_first_entry(&group->substreams, 2106 struct snd_pcm_substream, 2107 link_list)); 2108 do_free = refcount_dec_and_test(&group->refs); 2109 } 2110 2111 snd_pcm_group_unlock_irq(group, nonatomic); 2112 if (do_free) 2113 kfree(group); 2114 2115 _end: 2116 up_write(&snd_pcm_link_rwsem); 2117 return res; 2118 } 2119 2120 /* 2121 * hw configurator 2122 */ 2123 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2124 struct snd_pcm_hw_rule *rule) 2125 { 2126 struct snd_interval t; 2127 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2128 hw_param_interval_c(params, rule->deps[1]), &t); 2129 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2130 } 2131 2132 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2133 struct snd_pcm_hw_rule *rule) 2134 { 2135 struct snd_interval t; 2136 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2137 hw_param_interval_c(params, rule->deps[1]), &t); 2138 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2139 } 2140 2141 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2142 struct snd_pcm_hw_rule *rule) 2143 { 2144 struct snd_interval t; 2145 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2146 hw_param_interval_c(params, rule->deps[1]), 2147 (unsigned long) rule->private, &t); 2148 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2149 } 2150 2151 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2152 struct snd_pcm_hw_rule *rule) 2153 { 2154 struct snd_interval t; 2155 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2156 (unsigned long) rule->private, 2157 hw_param_interval_c(params, rule->deps[1]), &t); 2158 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2159 } 2160 2161 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2162 struct snd_pcm_hw_rule *rule) 2163 { 2164 unsigned int k; 2165 const struct snd_interval *i = 2166 hw_param_interval_c(params, rule->deps[0]); 2167 struct snd_mask m; 2168 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2169 snd_mask_any(&m); 2170 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2171 int bits; 2172 if (! snd_mask_test(mask, k)) 2173 continue; 2174 bits = snd_pcm_format_physical_width(k); 2175 if (bits <= 0) 2176 continue; /* ignore invalid formats */ 2177 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2178 snd_mask_reset(&m, k); 2179 } 2180 return snd_mask_refine(mask, &m); 2181 } 2182 2183 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2184 struct snd_pcm_hw_rule *rule) 2185 { 2186 struct snd_interval t; 2187 unsigned int k; 2188 t.min = UINT_MAX; 2189 t.max = 0; 2190 t.openmin = 0; 2191 t.openmax = 0; 2192 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2193 int bits; 2194 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2195 continue; 2196 bits = snd_pcm_format_physical_width(k); 2197 if (bits <= 0) 2198 continue; /* ignore invalid formats */ 2199 if (t.min > (unsigned)bits) 2200 t.min = bits; 2201 if (t.max < (unsigned)bits) 2202 t.max = bits; 2203 } 2204 t.integer = 1; 2205 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2206 } 2207 2208 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2209 #error "Change this table" 2210 #endif 2211 2212 static const unsigned int rates[] = { 2213 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2214 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000 2215 }; 2216 2217 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2218 .count = ARRAY_SIZE(rates), 2219 .list = rates, 2220 }; 2221 2222 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2223 struct snd_pcm_hw_rule *rule) 2224 { 2225 struct snd_pcm_hardware *hw = rule->private; 2226 return snd_interval_list(hw_param_interval(params, rule->var), 2227 snd_pcm_known_rates.count, 2228 snd_pcm_known_rates.list, hw->rates); 2229 } 2230 2231 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2232 struct snd_pcm_hw_rule *rule) 2233 { 2234 struct snd_interval t; 2235 struct snd_pcm_substream *substream = rule->private; 2236 t.min = 0; 2237 t.max = substream->buffer_bytes_max; 2238 t.openmin = 0; 2239 t.openmax = 0; 2240 t.integer = 1; 2241 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2242 } 2243 2244 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2245 { 2246 struct snd_pcm_runtime *runtime = substream->runtime; 2247 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2248 int k, err; 2249 2250 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2251 snd_mask_any(constrs_mask(constrs, k)); 2252 } 2253 2254 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2255 snd_interval_any(constrs_interval(constrs, k)); 2256 } 2257 2258 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2259 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2260 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2261 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2262 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2263 2264 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2265 snd_pcm_hw_rule_format, NULL, 2266 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2267 if (err < 0) 2268 return err; 2269 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2270 snd_pcm_hw_rule_sample_bits, NULL, 2271 SNDRV_PCM_HW_PARAM_FORMAT, 2272 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2273 if (err < 0) 2274 return err; 2275 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2276 snd_pcm_hw_rule_div, NULL, 2277 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2278 if (err < 0) 2279 return err; 2280 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2281 snd_pcm_hw_rule_mul, NULL, 2282 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2283 if (err < 0) 2284 return err; 2285 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2286 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2287 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2288 if (err < 0) 2289 return err; 2290 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2291 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2292 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2293 if (err < 0) 2294 return err; 2295 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2296 snd_pcm_hw_rule_div, NULL, 2297 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2298 if (err < 0) 2299 return err; 2300 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2301 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2302 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2303 if (err < 0) 2304 return err; 2305 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2306 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2307 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2308 if (err < 0) 2309 return err; 2310 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2311 snd_pcm_hw_rule_div, NULL, 2312 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2313 if (err < 0) 2314 return err; 2315 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2316 snd_pcm_hw_rule_div, NULL, 2317 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2318 if (err < 0) 2319 return err; 2320 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2321 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2322 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2323 if (err < 0) 2324 return err; 2325 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2326 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2327 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2328 if (err < 0) 2329 return err; 2330 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2331 snd_pcm_hw_rule_mul, NULL, 2332 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2333 if (err < 0) 2334 return err; 2335 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2336 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2337 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2338 if (err < 0) 2339 return err; 2340 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2341 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2342 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2343 if (err < 0) 2344 return err; 2345 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2346 snd_pcm_hw_rule_muldivk, (void*) 8, 2347 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2348 if (err < 0) 2349 return err; 2350 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2351 snd_pcm_hw_rule_muldivk, (void*) 8, 2352 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2353 if (err < 0) 2354 return err; 2355 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2356 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2357 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2358 if (err < 0) 2359 return err; 2360 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2361 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2362 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2363 if (err < 0) 2364 return err; 2365 return 0; 2366 } 2367 2368 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2369 { 2370 struct snd_pcm_runtime *runtime = substream->runtime; 2371 struct snd_pcm_hardware *hw = &runtime->hw; 2372 int err; 2373 unsigned int mask = 0; 2374 2375 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2376 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2377 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2378 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2379 if (hw_support_mmap(substream)) { 2380 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2381 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2382 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2383 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2384 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2385 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2386 } 2387 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2388 if (err < 0) 2389 return err; 2390 2391 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2392 if (err < 0) 2393 return err; 2394 2395 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2396 if (err < 0) 2397 return err; 2398 2399 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2400 hw->channels_min, hw->channels_max); 2401 if (err < 0) 2402 return err; 2403 2404 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2405 hw->rate_min, hw->rate_max); 2406 if (err < 0) 2407 return err; 2408 2409 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2410 hw->period_bytes_min, hw->period_bytes_max); 2411 if (err < 0) 2412 return err; 2413 2414 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2415 hw->periods_min, hw->periods_max); 2416 if (err < 0) 2417 return err; 2418 2419 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2420 hw->period_bytes_min, hw->buffer_bytes_max); 2421 if (err < 0) 2422 return err; 2423 2424 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2425 snd_pcm_hw_rule_buffer_bytes_max, substream, 2426 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2427 if (err < 0) 2428 return err; 2429 2430 /* FIXME: remove */ 2431 if (runtime->dma_bytes) { 2432 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2433 if (err < 0) 2434 return err; 2435 } 2436 2437 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2438 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2439 snd_pcm_hw_rule_rate, hw, 2440 SNDRV_PCM_HW_PARAM_RATE, -1); 2441 if (err < 0) 2442 return err; 2443 } 2444 2445 /* FIXME: this belong to lowlevel */ 2446 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2447 2448 return 0; 2449 } 2450 2451 static void pcm_release_private(struct snd_pcm_substream *substream) 2452 { 2453 if (snd_pcm_stream_linked(substream)) 2454 snd_pcm_unlink(substream); 2455 } 2456 2457 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2458 { 2459 substream->ref_count--; 2460 if (substream->ref_count > 0) 2461 return; 2462 2463 snd_pcm_drop(substream); 2464 if (substream->hw_opened) { 2465 if (substream->ops->hw_free && 2466 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2467 substream->ops->hw_free(substream); 2468 substream->ops->close(substream); 2469 substream->hw_opened = 0; 2470 } 2471 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2472 pm_qos_remove_request(&substream->latency_pm_qos_req); 2473 if (substream->pcm_release) { 2474 substream->pcm_release(substream); 2475 substream->pcm_release = NULL; 2476 } 2477 snd_pcm_detach_substream(substream); 2478 } 2479 EXPORT_SYMBOL(snd_pcm_release_substream); 2480 2481 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2482 struct file *file, 2483 struct snd_pcm_substream **rsubstream) 2484 { 2485 struct snd_pcm_substream *substream; 2486 int err; 2487 2488 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2489 if (err < 0) 2490 return err; 2491 if (substream->ref_count > 1) { 2492 *rsubstream = substream; 2493 return 0; 2494 } 2495 2496 err = snd_pcm_hw_constraints_init(substream); 2497 if (err < 0) { 2498 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2499 goto error; 2500 } 2501 2502 if ((err = substream->ops->open(substream)) < 0) 2503 goto error; 2504 2505 substream->hw_opened = 1; 2506 2507 err = snd_pcm_hw_constraints_complete(substream); 2508 if (err < 0) { 2509 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2510 goto error; 2511 } 2512 2513 *rsubstream = substream; 2514 return 0; 2515 2516 error: 2517 snd_pcm_release_substream(substream); 2518 return err; 2519 } 2520 EXPORT_SYMBOL(snd_pcm_open_substream); 2521 2522 static int snd_pcm_open_file(struct file *file, 2523 struct snd_pcm *pcm, 2524 int stream) 2525 { 2526 struct snd_pcm_file *pcm_file; 2527 struct snd_pcm_substream *substream; 2528 int err; 2529 2530 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2531 if (err < 0) 2532 return err; 2533 2534 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2535 if (pcm_file == NULL) { 2536 snd_pcm_release_substream(substream); 2537 return -ENOMEM; 2538 } 2539 pcm_file->substream = substream; 2540 if (substream->ref_count == 1) 2541 substream->pcm_release = pcm_release_private; 2542 file->private_data = pcm_file; 2543 2544 return 0; 2545 } 2546 2547 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2548 { 2549 struct snd_pcm *pcm; 2550 int err = nonseekable_open(inode, file); 2551 if (err < 0) 2552 return err; 2553 pcm = snd_lookup_minor_data(iminor(inode), 2554 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2555 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2556 if (pcm) 2557 snd_card_unref(pcm->card); 2558 return err; 2559 } 2560 2561 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2562 { 2563 struct snd_pcm *pcm; 2564 int err = nonseekable_open(inode, file); 2565 if (err < 0) 2566 return err; 2567 pcm = snd_lookup_minor_data(iminor(inode), 2568 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2569 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2570 if (pcm) 2571 snd_card_unref(pcm->card); 2572 return err; 2573 } 2574 2575 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2576 { 2577 int err; 2578 wait_queue_entry_t wait; 2579 2580 if (pcm == NULL) { 2581 err = -ENODEV; 2582 goto __error1; 2583 } 2584 err = snd_card_file_add(pcm->card, file); 2585 if (err < 0) 2586 goto __error1; 2587 if (!try_module_get(pcm->card->module)) { 2588 err = -EFAULT; 2589 goto __error2; 2590 } 2591 init_waitqueue_entry(&wait, current); 2592 add_wait_queue(&pcm->open_wait, &wait); 2593 mutex_lock(&pcm->open_mutex); 2594 while (1) { 2595 err = snd_pcm_open_file(file, pcm, stream); 2596 if (err >= 0) 2597 break; 2598 if (err == -EAGAIN) { 2599 if (file->f_flags & O_NONBLOCK) { 2600 err = -EBUSY; 2601 break; 2602 } 2603 } else 2604 break; 2605 set_current_state(TASK_INTERRUPTIBLE); 2606 mutex_unlock(&pcm->open_mutex); 2607 schedule(); 2608 mutex_lock(&pcm->open_mutex); 2609 if (pcm->card->shutdown) { 2610 err = -ENODEV; 2611 break; 2612 } 2613 if (signal_pending(current)) { 2614 err = -ERESTARTSYS; 2615 break; 2616 } 2617 } 2618 remove_wait_queue(&pcm->open_wait, &wait); 2619 mutex_unlock(&pcm->open_mutex); 2620 if (err < 0) 2621 goto __error; 2622 return err; 2623 2624 __error: 2625 module_put(pcm->card->module); 2626 __error2: 2627 snd_card_file_remove(pcm->card, file); 2628 __error1: 2629 return err; 2630 } 2631 2632 static int snd_pcm_release(struct inode *inode, struct file *file) 2633 { 2634 struct snd_pcm *pcm; 2635 struct snd_pcm_substream *substream; 2636 struct snd_pcm_file *pcm_file; 2637 2638 pcm_file = file->private_data; 2639 substream = pcm_file->substream; 2640 if (snd_BUG_ON(!substream)) 2641 return -ENXIO; 2642 pcm = substream->pcm; 2643 mutex_lock(&pcm->open_mutex); 2644 snd_pcm_release_substream(substream); 2645 kfree(pcm_file); 2646 mutex_unlock(&pcm->open_mutex); 2647 wake_up(&pcm->open_wait); 2648 module_put(pcm->card->module); 2649 snd_card_file_remove(pcm->card, file); 2650 return 0; 2651 } 2652 2653 /* check and update PCM state; return 0 or a negative error 2654 * call this inside PCM lock 2655 */ 2656 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2657 { 2658 switch (substream->runtime->status->state) { 2659 case SNDRV_PCM_STATE_DRAINING: 2660 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2661 return -EBADFD; 2662 /* Fall through */ 2663 case SNDRV_PCM_STATE_RUNNING: 2664 return snd_pcm_update_hw_ptr(substream); 2665 case SNDRV_PCM_STATE_PREPARED: 2666 case SNDRV_PCM_STATE_PAUSED: 2667 return 0; 2668 case SNDRV_PCM_STATE_SUSPENDED: 2669 return -ESTRPIPE; 2670 case SNDRV_PCM_STATE_XRUN: 2671 return -EPIPE; 2672 default: 2673 return -EBADFD; 2674 } 2675 } 2676 2677 /* increase the appl_ptr; returns the processed frames or a negative error */ 2678 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2679 snd_pcm_uframes_t frames, 2680 snd_pcm_sframes_t avail) 2681 { 2682 struct snd_pcm_runtime *runtime = substream->runtime; 2683 snd_pcm_sframes_t appl_ptr; 2684 int ret; 2685 2686 if (avail <= 0) 2687 return 0; 2688 if (frames > (snd_pcm_uframes_t)avail) 2689 frames = avail; 2690 appl_ptr = runtime->control->appl_ptr + frames; 2691 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2692 appl_ptr -= runtime->boundary; 2693 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2694 return ret < 0 ? ret : frames; 2695 } 2696 2697 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2698 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2699 snd_pcm_uframes_t frames, 2700 snd_pcm_sframes_t avail) 2701 { 2702 struct snd_pcm_runtime *runtime = substream->runtime; 2703 snd_pcm_sframes_t appl_ptr; 2704 int ret; 2705 2706 if (avail <= 0) 2707 return 0; 2708 if (frames > (snd_pcm_uframes_t)avail) 2709 frames = avail; 2710 appl_ptr = runtime->control->appl_ptr - frames; 2711 if (appl_ptr < 0) 2712 appl_ptr += runtime->boundary; 2713 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2714 /* NOTE: we return zero for errors because PulseAudio gets depressed 2715 * upon receiving an error from rewind ioctl and stops processing 2716 * any longer. Returning zero means that no rewind is done, so 2717 * it's not absolutely wrong to answer like that. 2718 */ 2719 return ret < 0 ? 0 : frames; 2720 } 2721 2722 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2723 snd_pcm_uframes_t frames) 2724 { 2725 snd_pcm_sframes_t ret; 2726 2727 if (frames == 0) 2728 return 0; 2729 2730 snd_pcm_stream_lock_irq(substream); 2731 ret = do_pcm_hwsync(substream); 2732 if (!ret) 2733 ret = rewind_appl_ptr(substream, frames, 2734 snd_pcm_hw_avail(substream)); 2735 snd_pcm_stream_unlock_irq(substream); 2736 return ret; 2737 } 2738 2739 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2740 snd_pcm_uframes_t frames) 2741 { 2742 snd_pcm_sframes_t ret; 2743 2744 if (frames == 0) 2745 return 0; 2746 2747 snd_pcm_stream_lock_irq(substream); 2748 ret = do_pcm_hwsync(substream); 2749 if (!ret) 2750 ret = forward_appl_ptr(substream, frames, 2751 snd_pcm_avail(substream)); 2752 snd_pcm_stream_unlock_irq(substream); 2753 return ret; 2754 } 2755 2756 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2757 { 2758 int err; 2759 2760 snd_pcm_stream_lock_irq(substream); 2761 err = do_pcm_hwsync(substream); 2762 snd_pcm_stream_unlock_irq(substream); 2763 return err; 2764 } 2765 2766 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2767 snd_pcm_sframes_t *delay) 2768 { 2769 int err; 2770 snd_pcm_sframes_t n = 0; 2771 2772 snd_pcm_stream_lock_irq(substream); 2773 err = do_pcm_hwsync(substream); 2774 if (!err) 2775 n = snd_pcm_calc_delay(substream); 2776 snd_pcm_stream_unlock_irq(substream); 2777 if (!err) 2778 *delay = n; 2779 return err; 2780 } 2781 2782 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2783 struct snd_pcm_sync_ptr __user *_sync_ptr) 2784 { 2785 struct snd_pcm_runtime *runtime = substream->runtime; 2786 struct snd_pcm_sync_ptr sync_ptr; 2787 volatile struct snd_pcm_mmap_status *status; 2788 volatile struct snd_pcm_mmap_control *control; 2789 int err; 2790 2791 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2792 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2793 return -EFAULT; 2794 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2795 return -EFAULT; 2796 status = runtime->status; 2797 control = runtime->control; 2798 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2799 err = snd_pcm_hwsync(substream); 2800 if (err < 0) 2801 return err; 2802 } 2803 snd_pcm_stream_lock_irq(substream); 2804 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2805 err = pcm_lib_apply_appl_ptr(substream, 2806 sync_ptr.c.control.appl_ptr); 2807 if (err < 0) { 2808 snd_pcm_stream_unlock_irq(substream); 2809 return err; 2810 } 2811 } else { 2812 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2813 } 2814 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2815 control->avail_min = sync_ptr.c.control.avail_min; 2816 else 2817 sync_ptr.c.control.avail_min = control->avail_min; 2818 sync_ptr.s.status.state = status->state; 2819 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2820 sync_ptr.s.status.tstamp = status->tstamp; 2821 sync_ptr.s.status.suspended_state = status->suspended_state; 2822 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2823 snd_pcm_stream_unlock_irq(substream); 2824 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2825 return -EFAULT; 2826 return 0; 2827 } 2828 2829 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2830 { 2831 struct snd_pcm_runtime *runtime = substream->runtime; 2832 int arg; 2833 2834 if (get_user(arg, _arg)) 2835 return -EFAULT; 2836 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2837 return -EINVAL; 2838 runtime->tstamp_type = arg; 2839 return 0; 2840 } 2841 2842 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2843 struct snd_xferi __user *_xferi) 2844 { 2845 struct snd_xferi xferi; 2846 struct snd_pcm_runtime *runtime = substream->runtime; 2847 snd_pcm_sframes_t result; 2848 2849 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2850 return -EBADFD; 2851 if (put_user(0, &_xferi->result)) 2852 return -EFAULT; 2853 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2854 return -EFAULT; 2855 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2856 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2857 else 2858 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2859 __put_user(result, &_xferi->result); 2860 return result < 0 ? result : 0; 2861 } 2862 2863 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2864 struct snd_xfern __user *_xfern) 2865 { 2866 struct snd_xfern xfern; 2867 struct snd_pcm_runtime *runtime = substream->runtime; 2868 void *bufs; 2869 snd_pcm_sframes_t result; 2870 2871 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2872 return -EBADFD; 2873 if (runtime->channels > 128) 2874 return -EINVAL; 2875 if (put_user(0, &_xfern->result)) 2876 return -EFAULT; 2877 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2878 return -EFAULT; 2879 2880 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2881 if (IS_ERR(bufs)) 2882 return PTR_ERR(bufs); 2883 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2884 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2885 else 2886 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2887 kfree(bufs); 2888 __put_user(result, &_xfern->result); 2889 return result < 0 ? result : 0; 2890 } 2891 2892 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2893 snd_pcm_uframes_t __user *_frames) 2894 { 2895 snd_pcm_uframes_t frames; 2896 snd_pcm_sframes_t result; 2897 2898 if (get_user(frames, _frames)) 2899 return -EFAULT; 2900 if (put_user(0, _frames)) 2901 return -EFAULT; 2902 result = snd_pcm_rewind(substream, frames); 2903 __put_user(result, _frames); 2904 return result < 0 ? result : 0; 2905 } 2906 2907 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2908 snd_pcm_uframes_t __user *_frames) 2909 { 2910 snd_pcm_uframes_t frames; 2911 snd_pcm_sframes_t result; 2912 2913 if (get_user(frames, _frames)) 2914 return -EFAULT; 2915 if (put_user(0, _frames)) 2916 return -EFAULT; 2917 result = snd_pcm_forward(substream, frames); 2918 __put_user(result, _frames); 2919 return result < 0 ? result : 0; 2920 } 2921 2922 static int snd_pcm_common_ioctl(struct file *file, 2923 struct snd_pcm_substream *substream, 2924 unsigned int cmd, void __user *arg) 2925 { 2926 struct snd_pcm_file *pcm_file = file->private_data; 2927 int res; 2928 2929 if (PCM_RUNTIME_CHECK(substream)) 2930 return -ENXIO; 2931 2932 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2933 if (res < 0) 2934 return res; 2935 2936 switch (cmd) { 2937 case SNDRV_PCM_IOCTL_PVERSION: 2938 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2939 case SNDRV_PCM_IOCTL_INFO: 2940 return snd_pcm_info_user(substream, arg); 2941 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2942 return 0; 2943 case SNDRV_PCM_IOCTL_TTSTAMP: 2944 return snd_pcm_tstamp(substream, arg); 2945 case SNDRV_PCM_IOCTL_USER_PVERSION: 2946 if (get_user(pcm_file->user_pversion, 2947 (unsigned int __user *)arg)) 2948 return -EFAULT; 2949 return 0; 2950 case SNDRV_PCM_IOCTL_HW_REFINE: 2951 return snd_pcm_hw_refine_user(substream, arg); 2952 case SNDRV_PCM_IOCTL_HW_PARAMS: 2953 return snd_pcm_hw_params_user(substream, arg); 2954 case SNDRV_PCM_IOCTL_HW_FREE: 2955 return snd_pcm_hw_free(substream); 2956 case SNDRV_PCM_IOCTL_SW_PARAMS: 2957 return snd_pcm_sw_params_user(substream, arg); 2958 case SNDRV_PCM_IOCTL_STATUS: 2959 return snd_pcm_status_user(substream, arg, false); 2960 case SNDRV_PCM_IOCTL_STATUS_EXT: 2961 return snd_pcm_status_user(substream, arg, true); 2962 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2963 return snd_pcm_channel_info_user(substream, arg); 2964 case SNDRV_PCM_IOCTL_PREPARE: 2965 return snd_pcm_prepare(substream, file); 2966 case SNDRV_PCM_IOCTL_RESET: 2967 return snd_pcm_reset(substream); 2968 case SNDRV_PCM_IOCTL_START: 2969 return snd_pcm_start_lock_irq(substream); 2970 case SNDRV_PCM_IOCTL_LINK: 2971 return snd_pcm_link(substream, (int)(unsigned long) arg); 2972 case SNDRV_PCM_IOCTL_UNLINK: 2973 return snd_pcm_unlink(substream); 2974 case SNDRV_PCM_IOCTL_RESUME: 2975 return snd_pcm_resume(substream); 2976 case SNDRV_PCM_IOCTL_XRUN: 2977 return snd_pcm_xrun(substream); 2978 case SNDRV_PCM_IOCTL_HWSYNC: 2979 return snd_pcm_hwsync(substream); 2980 case SNDRV_PCM_IOCTL_DELAY: 2981 { 2982 snd_pcm_sframes_t delay; 2983 snd_pcm_sframes_t __user *res = arg; 2984 int err; 2985 2986 err = snd_pcm_delay(substream, &delay); 2987 if (err) 2988 return err; 2989 if (put_user(delay, res)) 2990 return -EFAULT; 2991 return 0; 2992 } 2993 case SNDRV_PCM_IOCTL_SYNC_PTR: 2994 return snd_pcm_sync_ptr(substream, arg); 2995 #ifdef CONFIG_SND_SUPPORT_OLD_API 2996 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2997 return snd_pcm_hw_refine_old_user(substream, arg); 2998 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2999 return snd_pcm_hw_params_old_user(substream, arg); 3000 #endif 3001 case SNDRV_PCM_IOCTL_DRAIN: 3002 return snd_pcm_drain(substream, file); 3003 case SNDRV_PCM_IOCTL_DROP: 3004 return snd_pcm_drop(substream); 3005 case SNDRV_PCM_IOCTL_PAUSE: 3006 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 3007 substream, 3008 (int)(unsigned long)arg); 3009 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 3010 case SNDRV_PCM_IOCTL_READI_FRAMES: 3011 return snd_pcm_xferi_frames_ioctl(substream, arg); 3012 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 3013 case SNDRV_PCM_IOCTL_READN_FRAMES: 3014 return snd_pcm_xfern_frames_ioctl(substream, arg); 3015 case SNDRV_PCM_IOCTL_REWIND: 3016 return snd_pcm_rewind_ioctl(substream, arg); 3017 case SNDRV_PCM_IOCTL_FORWARD: 3018 return snd_pcm_forward_ioctl(substream, arg); 3019 } 3020 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 3021 return -ENOTTY; 3022 } 3023 3024 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 3025 unsigned long arg) 3026 { 3027 struct snd_pcm_file *pcm_file; 3028 3029 pcm_file = file->private_data; 3030 3031 if (((cmd >> 8) & 0xff) != 'A') 3032 return -ENOTTY; 3033 3034 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 3035 (void __user *)arg); 3036 } 3037 3038 /** 3039 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3040 * @substream: PCM substream 3041 * @cmd: IOCTL cmd 3042 * @arg: IOCTL argument 3043 * 3044 * The function is provided primarily for OSS layer and USB gadget drivers, 3045 * and it allows only the limited set of ioctls (hw_params, sw_params, 3046 * prepare, start, drain, drop, forward). 3047 */ 3048 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3049 unsigned int cmd, void *arg) 3050 { 3051 snd_pcm_uframes_t *frames = arg; 3052 snd_pcm_sframes_t result; 3053 3054 switch (cmd) { 3055 case SNDRV_PCM_IOCTL_FORWARD: 3056 { 3057 /* provided only for OSS; capture-only and no value returned */ 3058 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3059 return -EINVAL; 3060 result = snd_pcm_forward(substream, *frames); 3061 return result < 0 ? result : 0; 3062 } 3063 case SNDRV_PCM_IOCTL_HW_PARAMS: 3064 return snd_pcm_hw_params(substream, arg); 3065 case SNDRV_PCM_IOCTL_SW_PARAMS: 3066 return snd_pcm_sw_params(substream, arg); 3067 case SNDRV_PCM_IOCTL_PREPARE: 3068 return snd_pcm_prepare(substream, NULL); 3069 case SNDRV_PCM_IOCTL_START: 3070 return snd_pcm_start_lock_irq(substream); 3071 case SNDRV_PCM_IOCTL_DRAIN: 3072 return snd_pcm_drain(substream, NULL); 3073 case SNDRV_PCM_IOCTL_DROP: 3074 return snd_pcm_drop(substream); 3075 case SNDRV_PCM_IOCTL_DELAY: 3076 return snd_pcm_delay(substream, frames); 3077 default: 3078 return -EINVAL; 3079 } 3080 } 3081 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3082 3083 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3084 loff_t * offset) 3085 { 3086 struct snd_pcm_file *pcm_file; 3087 struct snd_pcm_substream *substream; 3088 struct snd_pcm_runtime *runtime; 3089 snd_pcm_sframes_t result; 3090 3091 pcm_file = file->private_data; 3092 substream = pcm_file->substream; 3093 if (PCM_RUNTIME_CHECK(substream)) 3094 return -ENXIO; 3095 runtime = substream->runtime; 3096 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3097 return -EBADFD; 3098 if (!frame_aligned(runtime, count)) 3099 return -EINVAL; 3100 count = bytes_to_frames(runtime, count); 3101 result = snd_pcm_lib_read(substream, buf, count); 3102 if (result > 0) 3103 result = frames_to_bytes(runtime, result); 3104 return result; 3105 } 3106 3107 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3108 size_t count, loff_t * offset) 3109 { 3110 struct snd_pcm_file *pcm_file; 3111 struct snd_pcm_substream *substream; 3112 struct snd_pcm_runtime *runtime; 3113 snd_pcm_sframes_t result; 3114 3115 pcm_file = file->private_data; 3116 substream = pcm_file->substream; 3117 if (PCM_RUNTIME_CHECK(substream)) 3118 return -ENXIO; 3119 runtime = substream->runtime; 3120 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3121 return -EBADFD; 3122 if (!frame_aligned(runtime, count)) 3123 return -EINVAL; 3124 count = bytes_to_frames(runtime, count); 3125 result = snd_pcm_lib_write(substream, buf, count); 3126 if (result > 0) 3127 result = frames_to_bytes(runtime, result); 3128 return result; 3129 } 3130 3131 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3132 { 3133 struct snd_pcm_file *pcm_file; 3134 struct snd_pcm_substream *substream; 3135 struct snd_pcm_runtime *runtime; 3136 snd_pcm_sframes_t result; 3137 unsigned long i; 3138 void __user **bufs; 3139 snd_pcm_uframes_t frames; 3140 3141 pcm_file = iocb->ki_filp->private_data; 3142 substream = pcm_file->substream; 3143 if (PCM_RUNTIME_CHECK(substream)) 3144 return -ENXIO; 3145 runtime = substream->runtime; 3146 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3147 return -EBADFD; 3148 if (!iter_is_iovec(to)) 3149 return -EINVAL; 3150 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3151 return -EINVAL; 3152 if (!frame_aligned(runtime, to->iov->iov_len)) 3153 return -EINVAL; 3154 frames = bytes_to_samples(runtime, to->iov->iov_len); 3155 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3156 if (bufs == NULL) 3157 return -ENOMEM; 3158 for (i = 0; i < to->nr_segs; ++i) 3159 bufs[i] = to->iov[i].iov_base; 3160 result = snd_pcm_lib_readv(substream, bufs, frames); 3161 if (result > 0) 3162 result = frames_to_bytes(runtime, result); 3163 kfree(bufs); 3164 return result; 3165 } 3166 3167 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3168 { 3169 struct snd_pcm_file *pcm_file; 3170 struct snd_pcm_substream *substream; 3171 struct snd_pcm_runtime *runtime; 3172 snd_pcm_sframes_t result; 3173 unsigned long i; 3174 void __user **bufs; 3175 snd_pcm_uframes_t frames; 3176 3177 pcm_file = iocb->ki_filp->private_data; 3178 substream = pcm_file->substream; 3179 if (PCM_RUNTIME_CHECK(substream)) 3180 return -ENXIO; 3181 runtime = substream->runtime; 3182 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3183 return -EBADFD; 3184 if (!iter_is_iovec(from)) 3185 return -EINVAL; 3186 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3187 !frame_aligned(runtime, from->iov->iov_len)) 3188 return -EINVAL; 3189 frames = bytes_to_samples(runtime, from->iov->iov_len); 3190 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3191 if (bufs == NULL) 3192 return -ENOMEM; 3193 for (i = 0; i < from->nr_segs; ++i) 3194 bufs[i] = from->iov[i].iov_base; 3195 result = snd_pcm_lib_writev(substream, bufs, frames); 3196 if (result > 0) 3197 result = frames_to_bytes(runtime, result); 3198 kfree(bufs); 3199 return result; 3200 } 3201 3202 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3203 { 3204 struct snd_pcm_file *pcm_file; 3205 struct snd_pcm_substream *substream; 3206 struct snd_pcm_runtime *runtime; 3207 __poll_t mask, ok; 3208 snd_pcm_uframes_t avail; 3209 3210 pcm_file = file->private_data; 3211 3212 substream = pcm_file->substream; 3213 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3214 ok = EPOLLOUT | EPOLLWRNORM; 3215 else 3216 ok = EPOLLIN | EPOLLRDNORM; 3217 if (PCM_RUNTIME_CHECK(substream)) 3218 return ok | EPOLLERR; 3219 3220 runtime = substream->runtime; 3221 poll_wait(file, &runtime->sleep, wait); 3222 3223 mask = 0; 3224 snd_pcm_stream_lock_irq(substream); 3225 avail = snd_pcm_avail(substream); 3226 switch (runtime->status->state) { 3227 case SNDRV_PCM_STATE_RUNNING: 3228 case SNDRV_PCM_STATE_PREPARED: 3229 case SNDRV_PCM_STATE_PAUSED: 3230 if (avail >= runtime->control->avail_min) 3231 mask = ok; 3232 break; 3233 case SNDRV_PCM_STATE_DRAINING: 3234 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3235 mask = ok; 3236 if (!avail) 3237 mask |= EPOLLERR; 3238 } 3239 break; 3240 default: 3241 mask = ok | EPOLLERR; 3242 break; 3243 } 3244 snd_pcm_stream_unlock_irq(substream); 3245 return mask; 3246 } 3247 3248 /* 3249 * mmap support 3250 */ 3251 3252 /* 3253 * Only on coherent architectures, we can mmap the status and the control records 3254 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3255 */ 3256 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3257 /* 3258 * mmap status record 3259 */ 3260 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3261 { 3262 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3263 struct snd_pcm_runtime *runtime; 3264 3265 if (substream == NULL) 3266 return VM_FAULT_SIGBUS; 3267 runtime = substream->runtime; 3268 vmf->page = virt_to_page(runtime->status); 3269 get_page(vmf->page); 3270 return 0; 3271 } 3272 3273 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3274 { 3275 .fault = snd_pcm_mmap_status_fault, 3276 }; 3277 3278 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3279 struct vm_area_struct *area) 3280 { 3281 long size; 3282 if (!(area->vm_flags & VM_READ)) 3283 return -EINVAL; 3284 size = area->vm_end - area->vm_start; 3285 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3286 return -EINVAL; 3287 area->vm_ops = &snd_pcm_vm_ops_status; 3288 area->vm_private_data = substream; 3289 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3290 return 0; 3291 } 3292 3293 /* 3294 * mmap control record 3295 */ 3296 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3297 { 3298 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3299 struct snd_pcm_runtime *runtime; 3300 3301 if (substream == NULL) 3302 return VM_FAULT_SIGBUS; 3303 runtime = substream->runtime; 3304 vmf->page = virt_to_page(runtime->control); 3305 get_page(vmf->page); 3306 return 0; 3307 } 3308 3309 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3310 { 3311 .fault = snd_pcm_mmap_control_fault, 3312 }; 3313 3314 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3315 struct vm_area_struct *area) 3316 { 3317 long size; 3318 if (!(area->vm_flags & VM_READ)) 3319 return -EINVAL; 3320 size = area->vm_end - area->vm_start; 3321 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3322 return -EINVAL; 3323 area->vm_ops = &snd_pcm_vm_ops_control; 3324 area->vm_private_data = substream; 3325 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3326 return 0; 3327 } 3328 3329 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3330 { 3331 if (pcm_file->no_compat_mmap) 3332 return false; 3333 /* See pcm_control_mmap_allowed() below. 3334 * Since older alsa-lib requires both status and control mmaps to be 3335 * coupled, we have to disable the status mmap for old alsa-lib, too. 3336 */ 3337 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3338 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3339 return false; 3340 return true; 3341 } 3342 3343 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3344 { 3345 if (pcm_file->no_compat_mmap) 3346 return false; 3347 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3348 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3349 * thus it effectively assures the manual update of appl_ptr. 3350 */ 3351 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3352 return false; 3353 return true; 3354 } 3355 3356 #else /* ! coherent mmap */ 3357 /* 3358 * don't support mmap for status and control records. 3359 */ 3360 #define pcm_status_mmap_allowed(pcm_file) false 3361 #define pcm_control_mmap_allowed(pcm_file) false 3362 3363 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3364 struct vm_area_struct *area) 3365 { 3366 return -ENXIO; 3367 } 3368 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3369 struct vm_area_struct *area) 3370 { 3371 return -ENXIO; 3372 } 3373 #endif /* coherent mmap */ 3374 3375 static inline struct page * 3376 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3377 { 3378 void *vaddr = substream->runtime->dma_area + ofs; 3379 3380 switch (substream->dma_buffer.dev.type) { 3381 #ifdef CONFIG_SND_DMA_SGBUF 3382 case SNDRV_DMA_TYPE_DEV_SG: 3383 case SNDRV_DMA_TYPE_DEV_UC_SG: 3384 return snd_pcm_sgbuf_ops_page(substream, ofs); 3385 #endif /* CONFIG_SND_DMA_SGBUF */ 3386 case SNDRV_DMA_TYPE_VMALLOC: 3387 return vmalloc_to_page(vaddr); 3388 default: 3389 return virt_to_page(vaddr); 3390 } 3391 } 3392 3393 /* 3394 * fault callback for mmapping a RAM page 3395 */ 3396 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3397 { 3398 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3399 struct snd_pcm_runtime *runtime; 3400 unsigned long offset; 3401 struct page * page; 3402 size_t dma_bytes; 3403 3404 if (substream == NULL) 3405 return VM_FAULT_SIGBUS; 3406 runtime = substream->runtime; 3407 offset = vmf->pgoff << PAGE_SHIFT; 3408 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3409 if (offset > dma_bytes - PAGE_SIZE) 3410 return VM_FAULT_SIGBUS; 3411 if (substream->ops->page) 3412 page = substream->ops->page(substream, offset); 3413 else 3414 page = snd_pcm_default_page_ops(substream, offset); 3415 if (!page) 3416 return VM_FAULT_SIGBUS; 3417 get_page(page); 3418 vmf->page = page; 3419 return 0; 3420 } 3421 3422 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3423 .open = snd_pcm_mmap_data_open, 3424 .close = snd_pcm_mmap_data_close, 3425 }; 3426 3427 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3428 .open = snd_pcm_mmap_data_open, 3429 .close = snd_pcm_mmap_data_close, 3430 .fault = snd_pcm_mmap_data_fault, 3431 }; 3432 3433 /* 3434 * mmap the DMA buffer on RAM 3435 */ 3436 3437 /** 3438 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3439 * @substream: PCM substream 3440 * @area: VMA 3441 * 3442 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3443 * this function is invoked implicitly. 3444 */ 3445 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3446 struct vm_area_struct *area) 3447 { 3448 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3449 #ifdef CONFIG_GENERIC_ALLOCATOR 3450 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3451 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3452 return remap_pfn_range(area, area->vm_start, 3453 substream->dma_buffer.addr >> PAGE_SHIFT, 3454 area->vm_end - area->vm_start, area->vm_page_prot); 3455 } 3456 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3457 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3458 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3459 (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV || 3460 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_UC)) 3461 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3462 area, 3463 substream->runtime->dma_area, 3464 substream->runtime->dma_addr, 3465 substream->runtime->dma_bytes); 3466 #endif /* CONFIG_X86 */ 3467 /* mmap with fault handler */ 3468 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3469 return 0; 3470 } 3471 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3472 3473 /* 3474 * mmap the DMA buffer on I/O memory area 3475 */ 3476 #if SNDRV_PCM_INFO_MMAP_IOMEM 3477 /** 3478 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3479 * @substream: PCM substream 3480 * @area: VMA 3481 * 3482 * When your hardware uses the iomapped pages as the hardware buffer and 3483 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3484 * is supposed to work only on limited architectures. 3485 */ 3486 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3487 struct vm_area_struct *area) 3488 { 3489 struct snd_pcm_runtime *runtime = substream->runtime; 3490 3491 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3492 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3493 } 3494 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3495 #endif /* SNDRV_PCM_INFO_MMAP */ 3496 3497 /* 3498 * mmap DMA buffer 3499 */ 3500 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3501 struct vm_area_struct *area) 3502 { 3503 struct snd_pcm_runtime *runtime; 3504 long size; 3505 unsigned long offset; 3506 size_t dma_bytes; 3507 int err; 3508 3509 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3510 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3511 return -EINVAL; 3512 } else { 3513 if (!(area->vm_flags & VM_READ)) 3514 return -EINVAL; 3515 } 3516 runtime = substream->runtime; 3517 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3518 return -EBADFD; 3519 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3520 return -ENXIO; 3521 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3522 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3523 return -EINVAL; 3524 size = area->vm_end - area->vm_start; 3525 offset = area->vm_pgoff << PAGE_SHIFT; 3526 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3527 if ((size_t)size > dma_bytes) 3528 return -EINVAL; 3529 if (offset > dma_bytes - size) 3530 return -EINVAL; 3531 3532 area->vm_ops = &snd_pcm_vm_ops_data; 3533 area->vm_private_data = substream; 3534 if (substream->ops->mmap) 3535 err = substream->ops->mmap(substream, area); 3536 else 3537 err = snd_pcm_lib_default_mmap(substream, area); 3538 if (!err) 3539 atomic_inc(&substream->mmap_count); 3540 return err; 3541 } 3542 EXPORT_SYMBOL(snd_pcm_mmap_data); 3543 3544 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3545 { 3546 struct snd_pcm_file * pcm_file; 3547 struct snd_pcm_substream *substream; 3548 unsigned long offset; 3549 3550 pcm_file = file->private_data; 3551 substream = pcm_file->substream; 3552 if (PCM_RUNTIME_CHECK(substream)) 3553 return -ENXIO; 3554 3555 offset = area->vm_pgoff << PAGE_SHIFT; 3556 switch (offset) { 3557 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3558 if (!pcm_status_mmap_allowed(pcm_file)) 3559 return -ENXIO; 3560 return snd_pcm_mmap_status(substream, file, area); 3561 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3562 if (!pcm_control_mmap_allowed(pcm_file)) 3563 return -ENXIO; 3564 return snd_pcm_mmap_control(substream, file, area); 3565 default: 3566 return snd_pcm_mmap_data(substream, file, area); 3567 } 3568 return 0; 3569 } 3570 3571 static int snd_pcm_fasync(int fd, struct file * file, int on) 3572 { 3573 struct snd_pcm_file * pcm_file; 3574 struct snd_pcm_substream *substream; 3575 struct snd_pcm_runtime *runtime; 3576 3577 pcm_file = file->private_data; 3578 substream = pcm_file->substream; 3579 if (PCM_RUNTIME_CHECK(substream)) 3580 return -ENXIO; 3581 runtime = substream->runtime; 3582 return fasync_helper(fd, file, on, &runtime->fasync); 3583 } 3584 3585 /* 3586 * ioctl32 compat 3587 */ 3588 #ifdef CONFIG_COMPAT 3589 #include "pcm_compat.c" 3590 #else 3591 #define snd_pcm_ioctl_compat NULL 3592 #endif 3593 3594 /* 3595 * To be removed helpers to keep binary compatibility 3596 */ 3597 3598 #ifdef CONFIG_SND_SUPPORT_OLD_API 3599 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3600 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3601 3602 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3603 struct snd_pcm_hw_params_old *oparams) 3604 { 3605 unsigned int i; 3606 3607 memset(params, 0, sizeof(*params)); 3608 params->flags = oparams->flags; 3609 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3610 params->masks[i].bits[0] = oparams->masks[i]; 3611 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3612 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3613 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3614 params->info = oparams->info; 3615 params->msbits = oparams->msbits; 3616 params->rate_num = oparams->rate_num; 3617 params->rate_den = oparams->rate_den; 3618 params->fifo_size = oparams->fifo_size; 3619 } 3620 3621 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3622 struct snd_pcm_hw_params *params) 3623 { 3624 unsigned int i; 3625 3626 memset(oparams, 0, sizeof(*oparams)); 3627 oparams->flags = params->flags; 3628 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3629 oparams->masks[i] = params->masks[i].bits[0]; 3630 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3631 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3632 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3633 oparams->info = params->info; 3634 oparams->msbits = params->msbits; 3635 oparams->rate_num = params->rate_num; 3636 oparams->rate_den = params->rate_den; 3637 oparams->fifo_size = params->fifo_size; 3638 } 3639 3640 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3641 struct snd_pcm_hw_params_old __user * _oparams) 3642 { 3643 struct snd_pcm_hw_params *params; 3644 struct snd_pcm_hw_params_old *oparams = NULL; 3645 int err; 3646 3647 params = kmalloc(sizeof(*params), GFP_KERNEL); 3648 if (!params) 3649 return -ENOMEM; 3650 3651 oparams = memdup_user(_oparams, sizeof(*oparams)); 3652 if (IS_ERR(oparams)) { 3653 err = PTR_ERR(oparams); 3654 goto out; 3655 } 3656 snd_pcm_hw_convert_from_old_params(params, oparams); 3657 err = snd_pcm_hw_refine(substream, params); 3658 if (err < 0) 3659 goto out_old; 3660 3661 err = fixup_unreferenced_params(substream, params); 3662 if (err < 0) 3663 goto out_old; 3664 3665 snd_pcm_hw_convert_to_old_params(oparams, params); 3666 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3667 err = -EFAULT; 3668 out_old: 3669 kfree(oparams); 3670 out: 3671 kfree(params); 3672 return err; 3673 } 3674 3675 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3676 struct snd_pcm_hw_params_old __user * _oparams) 3677 { 3678 struct snd_pcm_hw_params *params; 3679 struct snd_pcm_hw_params_old *oparams = NULL; 3680 int err; 3681 3682 params = kmalloc(sizeof(*params), GFP_KERNEL); 3683 if (!params) 3684 return -ENOMEM; 3685 3686 oparams = memdup_user(_oparams, sizeof(*oparams)); 3687 if (IS_ERR(oparams)) { 3688 err = PTR_ERR(oparams); 3689 goto out; 3690 } 3691 3692 snd_pcm_hw_convert_from_old_params(params, oparams); 3693 err = snd_pcm_hw_params(substream, params); 3694 if (err < 0) 3695 goto out_old; 3696 3697 snd_pcm_hw_convert_to_old_params(oparams, params); 3698 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3699 err = -EFAULT; 3700 out_old: 3701 kfree(oparams); 3702 out: 3703 kfree(params); 3704 return err; 3705 } 3706 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3707 3708 #ifndef CONFIG_MMU 3709 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3710 unsigned long addr, 3711 unsigned long len, 3712 unsigned long pgoff, 3713 unsigned long flags) 3714 { 3715 struct snd_pcm_file *pcm_file = file->private_data; 3716 struct snd_pcm_substream *substream = pcm_file->substream; 3717 struct snd_pcm_runtime *runtime = substream->runtime; 3718 unsigned long offset = pgoff << PAGE_SHIFT; 3719 3720 switch (offset) { 3721 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3722 return (unsigned long)runtime->status; 3723 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3724 return (unsigned long)runtime->control; 3725 default: 3726 return (unsigned long)runtime->dma_area + offset; 3727 } 3728 } 3729 #else 3730 # define snd_pcm_get_unmapped_area NULL 3731 #endif 3732 3733 /* 3734 * Register section 3735 */ 3736 3737 const struct file_operations snd_pcm_f_ops[2] = { 3738 { 3739 .owner = THIS_MODULE, 3740 .write = snd_pcm_write, 3741 .write_iter = snd_pcm_writev, 3742 .open = snd_pcm_playback_open, 3743 .release = snd_pcm_release, 3744 .llseek = no_llseek, 3745 .poll = snd_pcm_poll, 3746 .unlocked_ioctl = snd_pcm_ioctl, 3747 .compat_ioctl = snd_pcm_ioctl_compat, 3748 .mmap = snd_pcm_mmap, 3749 .fasync = snd_pcm_fasync, 3750 .get_unmapped_area = snd_pcm_get_unmapped_area, 3751 }, 3752 { 3753 .owner = THIS_MODULE, 3754 .read = snd_pcm_read, 3755 .read_iter = snd_pcm_readv, 3756 .open = snd_pcm_capture_open, 3757 .release = snd_pcm_release, 3758 .llseek = no_llseek, 3759 .poll = snd_pcm_poll, 3760 .unlocked_ioctl = snd_pcm_ioctl, 3761 .compat_ioctl = snd_pcm_ioctl_compat, 3762 .mmap = snd_pcm_mmap, 3763 .fasync = snd_pcm_fasync, 3764 .get_unmapped_area = snd_pcm_get_unmapped_area, 3765 } 3766 }; 3767