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 /* clear the buffer for avoiding possible kernel info leaks */ 743 if (runtime->dma_area && !substream->ops->copy_user) 744 memset(runtime->dma_area, 0, runtime->dma_bytes); 745 746 snd_pcm_timer_resolution_change(substream); 747 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 748 749 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 750 pm_qos_remove_request(&substream->latency_pm_qos_req); 751 if ((usecs = period_to_usecs(runtime)) >= 0) 752 pm_qos_add_request(&substream->latency_pm_qos_req, 753 PM_QOS_CPU_DMA_LATENCY, usecs); 754 return 0; 755 _error: 756 /* hardware might be unusable from this time, 757 so we force application to retry to set 758 the correct hardware parameter settings */ 759 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 760 if (substream->ops->hw_free != NULL) 761 substream->ops->hw_free(substream); 762 if (substream->managed_buffer_alloc) 763 snd_pcm_lib_free_pages(substream); 764 return err; 765 } 766 767 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 768 struct snd_pcm_hw_params __user * _params) 769 { 770 struct snd_pcm_hw_params *params; 771 int err; 772 773 params = memdup_user(_params, sizeof(*params)); 774 if (IS_ERR(params)) 775 return PTR_ERR(params); 776 777 err = snd_pcm_hw_params(substream, params); 778 if (err < 0) 779 goto end; 780 781 if (copy_to_user(_params, params, sizeof(*params))) 782 err = -EFAULT; 783 end: 784 kfree(params); 785 return err; 786 } 787 788 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 789 { 790 struct snd_pcm_runtime *runtime; 791 int result = 0; 792 793 if (PCM_RUNTIME_CHECK(substream)) 794 return -ENXIO; 795 runtime = substream->runtime; 796 snd_pcm_stream_lock_irq(substream); 797 switch (runtime->status->state) { 798 case SNDRV_PCM_STATE_SETUP: 799 case SNDRV_PCM_STATE_PREPARED: 800 break; 801 default: 802 snd_pcm_stream_unlock_irq(substream); 803 return -EBADFD; 804 } 805 snd_pcm_stream_unlock_irq(substream); 806 if (atomic_read(&substream->mmap_count)) 807 return -EBADFD; 808 snd_pcm_sync_stop(substream); 809 if (substream->ops->hw_free) 810 result = substream->ops->hw_free(substream); 811 if (substream->managed_buffer_alloc) 812 snd_pcm_lib_free_pages(substream); 813 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 814 pm_qos_remove_request(&substream->latency_pm_qos_req); 815 return result; 816 } 817 818 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 819 struct snd_pcm_sw_params *params) 820 { 821 struct snd_pcm_runtime *runtime; 822 int err; 823 824 if (PCM_RUNTIME_CHECK(substream)) 825 return -ENXIO; 826 runtime = substream->runtime; 827 snd_pcm_stream_lock_irq(substream); 828 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 829 snd_pcm_stream_unlock_irq(substream); 830 return -EBADFD; 831 } 832 snd_pcm_stream_unlock_irq(substream); 833 834 if (params->tstamp_mode < 0 || 835 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 836 return -EINVAL; 837 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 838 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 839 return -EINVAL; 840 if (params->avail_min == 0) 841 return -EINVAL; 842 if (params->silence_size >= runtime->boundary) { 843 if (params->silence_threshold != 0) 844 return -EINVAL; 845 } else { 846 if (params->silence_size > params->silence_threshold) 847 return -EINVAL; 848 if (params->silence_threshold > runtime->buffer_size) 849 return -EINVAL; 850 } 851 err = 0; 852 snd_pcm_stream_lock_irq(substream); 853 runtime->tstamp_mode = params->tstamp_mode; 854 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 855 runtime->tstamp_type = params->tstamp_type; 856 runtime->period_step = params->period_step; 857 runtime->control->avail_min = params->avail_min; 858 runtime->start_threshold = params->start_threshold; 859 runtime->stop_threshold = params->stop_threshold; 860 runtime->silence_threshold = params->silence_threshold; 861 runtime->silence_size = params->silence_size; 862 params->boundary = runtime->boundary; 863 if (snd_pcm_running(substream)) { 864 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 865 runtime->silence_size > 0) 866 snd_pcm_playback_silence(substream, ULONG_MAX); 867 err = snd_pcm_update_state(substream, runtime); 868 } 869 snd_pcm_stream_unlock_irq(substream); 870 return err; 871 } 872 873 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 874 struct snd_pcm_sw_params __user * _params) 875 { 876 struct snd_pcm_sw_params params; 877 int err; 878 if (copy_from_user(¶ms, _params, sizeof(params))) 879 return -EFAULT; 880 err = snd_pcm_sw_params(substream, ¶ms); 881 if (copy_to_user(_params, ¶ms, sizeof(params))) 882 return -EFAULT; 883 return err; 884 } 885 886 static inline snd_pcm_uframes_t 887 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 888 { 889 snd_pcm_uframes_t delay; 890 891 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 892 delay = snd_pcm_playback_hw_avail(substream->runtime); 893 else 894 delay = snd_pcm_capture_avail(substream->runtime); 895 return delay + substream->runtime->delay; 896 } 897 898 int snd_pcm_status(struct snd_pcm_substream *substream, 899 struct snd_pcm_status *status) 900 { 901 struct snd_pcm_runtime *runtime = substream->runtime; 902 903 snd_pcm_stream_lock_irq(substream); 904 905 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 906 &runtime->audio_tstamp_config); 907 908 /* backwards compatible behavior */ 909 if (runtime->audio_tstamp_config.type_requested == 910 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 911 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 912 runtime->audio_tstamp_config.type_requested = 913 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 914 else 915 runtime->audio_tstamp_config.type_requested = 916 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 917 runtime->audio_tstamp_report.valid = 0; 918 } else 919 runtime->audio_tstamp_report.valid = 1; 920 921 status->state = runtime->status->state; 922 status->suspended_state = runtime->status->suspended_state; 923 if (status->state == SNDRV_PCM_STATE_OPEN) 924 goto _end; 925 status->trigger_tstamp = runtime->trigger_tstamp; 926 if (snd_pcm_running(substream)) { 927 snd_pcm_update_hw_ptr(substream); 928 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 929 status->tstamp = runtime->status->tstamp; 930 status->driver_tstamp = runtime->driver_tstamp; 931 status->audio_tstamp = 932 runtime->status->audio_tstamp; 933 if (runtime->audio_tstamp_report.valid == 1) 934 /* backwards compatibility, no report provided in COMPAT mode */ 935 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 936 &status->audio_tstamp_accuracy, 937 &runtime->audio_tstamp_report); 938 939 goto _tstamp_end; 940 } 941 } else { 942 /* get tstamp only in fallback mode and only if enabled */ 943 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 944 snd_pcm_gettime(runtime, &status->tstamp); 945 } 946 _tstamp_end: 947 status->appl_ptr = runtime->control->appl_ptr; 948 status->hw_ptr = runtime->status->hw_ptr; 949 status->avail = snd_pcm_avail(substream); 950 status->delay = snd_pcm_running(substream) ? 951 snd_pcm_calc_delay(substream) : 0; 952 status->avail_max = runtime->avail_max; 953 status->overrange = runtime->overrange; 954 runtime->avail_max = 0; 955 runtime->overrange = 0; 956 _end: 957 snd_pcm_stream_unlock_irq(substream); 958 return 0; 959 } 960 961 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 962 struct snd_pcm_status __user * _status, 963 bool ext) 964 { 965 struct snd_pcm_status status; 966 int res; 967 968 memset(&status, 0, sizeof(status)); 969 /* 970 * with extension, parameters are read/write, 971 * get audio_tstamp_data from user, 972 * ignore rest of status structure 973 */ 974 if (ext && get_user(status.audio_tstamp_data, 975 (u32 __user *)(&_status->audio_tstamp_data))) 976 return -EFAULT; 977 res = snd_pcm_status(substream, &status); 978 if (res < 0) 979 return res; 980 if (copy_to_user(_status, &status, sizeof(status))) 981 return -EFAULT; 982 return 0; 983 } 984 985 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 986 struct snd_pcm_channel_info * info) 987 { 988 struct snd_pcm_runtime *runtime; 989 unsigned int channel; 990 991 channel = info->channel; 992 runtime = substream->runtime; 993 snd_pcm_stream_lock_irq(substream); 994 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 995 snd_pcm_stream_unlock_irq(substream); 996 return -EBADFD; 997 } 998 snd_pcm_stream_unlock_irq(substream); 999 if (channel >= runtime->channels) 1000 return -EINVAL; 1001 memset(info, 0, sizeof(*info)); 1002 info->channel = channel; 1003 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 1004 } 1005 1006 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 1007 struct snd_pcm_channel_info __user * _info) 1008 { 1009 struct snd_pcm_channel_info info; 1010 int res; 1011 1012 if (copy_from_user(&info, _info, sizeof(info))) 1013 return -EFAULT; 1014 res = snd_pcm_channel_info(substream, &info); 1015 if (res < 0) 1016 return res; 1017 if (copy_to_user(_info, &info, sizeof(info))) 1018 return -EFAULT; 1019 return 0; 1020 } 1021 1022 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 1023 { 1024 struct snd_pcm_runtime *runtime = substream->runtime; 1025 if (runtime->trigger_master == NULL) 1026 return; 1027 if (runtime->trigger_master == substream) { 1028 if (!runtime->trigger_tstamp_latched) 1029 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1030 } else { 1031 snd_pcm_trigger_tstamp(runtime->trigger_master); 1032 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1033 } 1034 runtime->trigger_master = NULL; 1035 } 1036 1037 struct action_ops { 1038 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1039 int (*do_action)(struct snd_pcm_substream *substream, int state); 1040 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1041 void (*post_action)(struct snd_pcm_substream *substream, int state); 1042 }; 1043 1044 /* 1045 * this functions is core for handling of linked stream 1046 * Note: the stream state might be changed also on failure 1047 * Note2: call with calling stream lock + link lock 1048 */ 1049 static int snd_pcm_action_group(const struct action_ops *ops, 1050 struct snd_pcm_substream *substream, 1051 int state, int do_lock) 1052 { 1053 struct snd_pcm_substream *s = NULL; 1054 struct snd_pcm_substream *s1; 1055 int res = 0, depth = 1; 1056 1057 snd_pcm_group_for_each_entry(s, substream) { 1058 if (do_lock && s != substream) { 1059 if (s->pcm->nonatomic) 1060 mutex_lock_nested(&s->self_group.mutex, depth); 1061 else 1062 spin_lock_nested(&s->self_group.lock, depth); 1063 depth++; 1064 } 1065 res = ops->pre_action(s, state); 1066 if (res < 0) 1067 goto _unlock; 1068 } 1069 snd_pcm_group_for_each_entry(s, substream) { 1070 res = ops->do_action(s, state); 1071 if (res < 0) { 1072 if (ops->undo_action) { 1073 snd_pcm_group_for_each_entry(s1, substream) { 1074 if (s1 == s) /* failed stream */ 1075 break; 1076 ops->undo_action(s1, state); 1077 } 1078 } 1079 s = NULL; /* unlock all */ 1080 goto _unlock; 1081 } 1082 } 1083 snd_pcm_group_for_each_entry(s, substream) { 1084 ops->post_action(s, state); 1085 } 1086 _unlock: 1087 if (do_lock) { 1088 /* unlock streams */ 1089 snd_pcm_group_for_each_entry(s1, substream) { 1090 if (s1 != substream) { 1091 if (s1->pcm->nonatomic) 1092 mutex_unlock(&s1->self_group.mutex); 1093 else 1094 spin_unlock(&s1->self_group.lock); 1095 } 1096 if (s1 == s) /* end */ 1097 break; 1098 } 1099 } 1100 return res; 1101 } 1102 1103 /* 1104 * Note: call with stream lock 1105 */ 1106 static int snd_pcm_action_single(const struct action_ops *ops, 1107 struct snd_pcm_substream *substream, 1108 int state) 1109 { 1110 int res; 1111 1112 res = ops->pre_action(substream, state); 1113 if (res < 0) 1114 return res; 1115 res = ops->do_action(substream, state); 1116 if (res == 0) 1117 ops->post_action(substream, state); 1118 else if (ops->undo_action) 1119 ops->undo_action(substream, state); 1120 return res; 1121 } 1122 1123 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1124 struct snd_pcm_group *new_group) 1125 { 1126 substream->group = new_group; 1127 list_move(&substream->link_list, &new_group->substreams); 1128 } 1129 1130 /* 1131 * Unref and unlock the group, but keep the stream lock; 1132 * when the group becomes empty and no longer referred, destroy itself 1133 */ 1134 static void snd_pcm_group_unref(struct snd_pcm_group *group, 1135 struct snd_pcm_substream *substream) 1136 { 1137 bool do_free; 1138 1139 if (!group) 1140 return; 1141 do_free = refcount_dec_and_test(&group->refs); 1142 snd_pcm_group_unlock(group, substream->pcm->nonatomic); 1143 if (do_free) 1144 kfree(group); 1145 } 1146 1147 /* 1148 * Lock the group inside a stream lock and reference it; 1149 * return the locked group object, or NULL if not linked 1150 */ 1151 static struct snd_pcm_group * 1152 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) 1153 { 1154 bool nonatomic = substream->pcm->nonatomic; 1155 struct snd_pcm_group *group; 1156 bool trylock; 1157 1158 for (;;) { 1159 if (!snd_pcm_stream_linked(substream)) 1160 return NULL; 1161 group = substream->group; 1162 /* block freeing the group object */ 1163 refcount_inc(&group->refs); 1164 1165 trylock = nonatomic ? mutex_trylock(&group->mutex) : 1166 spin_trylock(&group->lock); 1167 if (trylock) 1168 break; /* OK */ 1169 1170 /* re-lock for avoiding ABBA deadlock */ 1171 snd_pcm_stream_unlock(substream); 1172 snd_pcm_group_lock(group, nonatomic); 1173 snd_pcm_stream_lock(substream); 1174 1175 /* check the group again; the above opens a small race window */ 1176 if (substream->group == group) 1177 break; /* OK */ 1178 /* group changed, try again */ 1179 snd_pcm_group_unref(group, substream); 1180 } 1181 return group; 1182 } 1183 1184 /* 1185 * Note: call with stream lock 1186 */ 1187 static int snd_pcm_action(const struct action_ops *ops, 1188 struct snd_pcm_substream *substream, 1189 int state) 1190 { 1191 struct snd_pcm_group *group; 1192 int res; 1193 1194 group = snd_pcm_stream_group_ref(substream); 1195 if (group) 1196 res = snd_pcm_action_group(ops, substream, state, 1); 1197 else 1198 res = snd_pcm_action_single(ops, substream, state); 1199 snd_pcm_group_unref(group, substream); 1200 return res; 1201 } 1202 1203 /* 1204 * Note: don't use any locks before 1205 */ 1206 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1207 struct snd_pcm_substream *substream, 1208 int state) 1209 { 1210 int res; 1211 1212 snd_pcm_stream_lock_irq(substream); 1213 res = snd_pcm_action(ops, substream, state); 1214 snd_pcm_stream_unlock_irq(substream); 1215 return res; 1216 } 1217 1218 /* 1219 */ 1220 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1221 struct snd_pcm_substream *substream, 1222 int state) 1223 { 1224 int res; 1225 1226 /* Guarantee the group members won't change during non-atomic action */ 1227 down_read(&snd_pcm_link_rwsem); 1228 if (snd_pcm_stream_linked(substream)) 1229 res = snd_pcm_action_group(ops, substream, state, 0); 1230 else 1231 res = snd_pcm_action_single(ops, substream, state); 1232 up_read(&snd_pcm_link_rwsem); 1233 return res; 1234 } 1235 1236 /* 1237 * start callbacks 1238 */ 1239 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1240 { 1241 struct snd_pcm_runtime *runtime = substream->runtime; 1242 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1243 return -EBADFD; 1244 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1245 !snd_pcm_playback_data(substream)) 1246 return -EPIPE; 1247 runtime->trigger_tstamp_latched = false; 1248 runtime->trigger_master = substream; 1249 return 0; 1250 } 1251 1252 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1253 { 1254 if (substream->runtime->trigger_master != substream) 1255 return 0; 1256 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1257 } 1258 1259 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1260 { 1261 if (substream->runtime->trigger_master == substream) 1262 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1263 } 1264 1265 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1266 { 1267 struct snd_pcm_runtime *runtime = substream->runtime; 1268 snd_pcm_trigger_tstamp(substream); 1269 runtime->hw_ptr_jiffies = jiffies; 1270 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1271 runtime->rate; 1272 runtime->status->state = state; 1273 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1274 runtime->silence_size > 0) 1275 snd_pcm_playback_silence(substream, ULONG_MAX); 1276 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1277 } 1278 1279 static const struct action_ops snd_pcm_action_start = { 1280 .pre_action = snd_pcm_pre_start, 1281 .do_action = snd_pcm_do_start, 1282 .undo_action = snd_pcm_undo_start, 1283 .post_action = snd_pcm_post_start 1284 }; 1285 1286 /** 1287 * snd_pcm_start - start all linked streams 1288 * @substream: the PCM substream instance 1289 * 1290 * Return: Zero if successful, or a negative error code. 1291 * The stream lock must be acquired before calling this function. 1292 */ 1293 int snd_pcm_start(struct snd_pcm_substream *substream) 1294 { 1295 return snd_pcm_action(&snd_pcm_action_start, substream, 1296 SNDRV_PCM_STATE_RUNNING); 1297 } 1298 1299 /* take the stream lock and start the streams */ 1300 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1301 { 1302 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1303 SNDRV_PCM_STATE_RUNNING); 1304 } 1305 1306 /* 1307 * stop callbacks 1308 */ 1309 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1310 { 1311 struct snd_pcm_runtime *runtime = substream->runtime; 1312 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1313 return -EBADFD; 1314 runtime->trigger_master = substream; 1315 return 0; 1316 } 1317 1318 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1319 { 1320 if (substream->runtime->trigger_master == substream && 1321 snd_pcm_running(substream)) 1322 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1323 return 0; /* unconditonally stop all substreams */ 1324 } 1325 1326 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1327 { 1328 struct snd_pcm_runtime *runtime = substream->runtime; 1329 if (runtime->status->state != state) { 1330 snd_pcm_trigger_tstamp(substream); 1331 runtime->status->state = state; 1332 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1333 } 1334 runtime->stop_operating = true; 1335 wake_up(&runtime->sleep); 1336 wake_up(&runtime->tsleep); 1337 } 1338 1339 static const struct action_ops snd_pcm_action_stop = { 1340 .pre_action = snd_pcm_pre_stop, 1341 .do_action = snd_pcm_do_stop, 1342 .post_action = snd_pcm_post_stop 1343 }; 1344 1345 /** 1346 * snd_pcm_stop - try to stop all running streams in the substream group 1347 * @substream: the PCM substream instance 1348 * @state: PCM state after stopping the stream 1349 * 1350 * The state of each stream is then changed to the given state unconditionally. 1351 * 1352 * Return: Zero if successful, or a negative error code. 1353 */ 1354 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1355 { 1356 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1357 } 1358 EXPORT_SYMBOL(snd_pcm_stop); 1359 1360 /** 1361 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1362 * @substream: the PCM substream 1363 * 1364 * After stopping, the state is changed to SETUP. 1365 * Unlike snd_pcm_stop(), this affects only the given stream. 1366 * 1367 * Return: Zero if succesful, or a negative error code. 1368 */ 1369 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1370 { 1371 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1372 SNDRV_PCM_STATE_SETUP); 1373 } 1374 1375 /** 1376 * snd_pcm_stop_xrun - stop the running streams as XRUN 1377 * @substream: the PCM substream instance 1378 * 1379 * This stops the given running substream (and all linked substreams) as XRUN. 1380 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1381 * 1382 * Return: Zero if successful, or a negative error code. 1383 */ 1384 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1385 { 1386 unsigned long flags; 1387 1388 snd_pcm_stream_lock_irqsave(substream, flags); 1389 if (substream->runtime && snd_pcm_running(substream)) 1390 __snd_pcm_xrun(substream); 1391 snd_pcm_stream_unlock_irqrestore(substream, flags); 1392 return 0; 1393 } 1394 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1395 1396 /* 1397 * pause callbacks 1398 */ 1399 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1400 { 1401 struct snd_pcm_runtime *runtime = substream->runtime; 1402 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1403 return -ENOSYS; 1404 if (push) { 1405 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1406 return -EBADFD; 1407 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1408 return -EBADFD; 1409 runtime->trigger_master = substream; 1410 return 0; 1411 } 1412 1413 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1414 { 1415 if (substream->runtime->trigger_master != substream) 1416 return 0; 1417 /* some drivers might use hw_ptr to recover from the pause - 1418 update the hw_ptr now */ 1419 if (push) 1420 snd_pcm_update_hw_ptr(substream); 1421 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1422 * a delta between the current jiffies, this gives a large enough 1423 * delta, effectively to skip the check once. 1424 */ 1425 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1426 return substream->ops->trigger(substream, 1427 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1428 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1429 } 1430 1431 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1432 { 1433 if (substream->runtime->trigger_master == substream) 1434 substream->ops->trigger(substream, 1435 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1436 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1437 } 1438 1439 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1440 { 1441 struct snd_pcm_runtime *runtime = substream->runtime; 1442 snd_pcm_trigger_tstamp(substream); 1443 if (push) { 1444 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1445 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1446 wake_up(&runtime->sleep); 1447 wake_up(&runtime->tsleep); 1448 } else { 1449 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1450 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1451 } 1452 } 1453 1454 static const struct action_ops snd_pcm_action_pause = { 1455 .pre_action = snd_pcm_pre_pause, 1456 .do_action = snd_pcm_do_pause, 1457 .undo_action = snd_pcm_undo_pause, 1458 .post_action = snd_pcm_post_pause 1459 }; 1460 1461 /* 1462 * Push/release the pause for all linked streams. 1463 */ 1464 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1465 { 1466 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1467 } 1468 1469 #ifdef CONFIG_PM 1470 /* suspend */ 1471 1472 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1473 { 1474 struct snd_pcm_runtime *runtime = substream->runtime; 1475 switch (runtime->status->state) { 1476 case SNDRV_PCM_STATE_SUSPENDED: 1477 return -EBUSY; 1478 /* unresumable PCM state; return -EBUSY for skipping suspend */ 1479 case SNDRV_PCM_STATE_OPEN: 1480 case SNDRV_PCM_STATE_SETUP: 1481 case SNDRV_PCM_STATE_DISCONNECTED: 1482 return -EBUSY; 1483 } 1484 runtime->trigger_master = substream; 1485 return 0; 1486 } 1487 1488 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1489 { 1490 struct snd_pcm_runtime *runtime = substream->runtime; 1491 if (runtime->trigger_master != substream) 1492 return 0; 1493 if (! snd_pcm_running(substream)) 1494 return 0; 1495 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1496 return 0; /* suspend unconditionally */ 1497 } 1498 1499 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1500 { 1501 struct snd_pcm_runtime *runtime = substream->runtime; 1502 snd_pcm_trigger_tstamp(substream); 1503 runtime->status->suspended_state = runtime->status->state; 1504 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1505 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1506 wake_up(&runtime->sleep); 1507 wake_up(&runtime->tsleep); 1508 } 1509 1510 static const struct action_ops snd_pcm_action_suspend = { 1511 .pre_action = snd_pcm_pre_suspend, 1512 .do_action = snd_pcm_do_suspend, 1513 .post_action = snd_pcm_post_suspend 1514 }; 1515 1516 /* 1517 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1518 * @substream: the PCM substream 1519 * 1520 * After this call, all streams are changed to SUSPENDED state. 1521 * 1522 * Return: Zero if successful, or a negative error code. 1523 */ 1524 static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1525 { 1526 int err; 1527 unsigned long flags; 1528 1529 snd_pcm_stream_lock_irqsave(substream, flags); 1530 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1531 snd_pcm_stream_unlock_irqrestore(substream, flags); 1532 return err; 1533 } 1534 1535 /** 1536 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1537 * @pcm: the PCM instance 1538 * 1539 * After this call, all streams are changed to SUSPENDED state. 1540 * 1541 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1542 */ 1543 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1544 { 1545 struct snd_pcm_substream *substream; 1546 int stream, err = 0; 1547 1548 if (! pcm) 1549 return 0; 1550 1551 for (stream = 0; stream < 2; stream++) { 1552 for (substream = pcm->streams[stream].substream; 1553 substream; substream = substream->next) { 1554 /* FIXME: the open/close code should lock this as well */ 1555 if (substream->runtime == NULL) 1556 continue; 1557 1558 /* 1559 * Skip BE dai link PCM's that are internal and may 1560 * not have their substream ops set. 1561 */ 1562 if (!substream->ops) 1563 continue; 1564 1565 err = snd_pcm_suspend(substream); 1566 if (err < 0 && err != -EBUSY) 1567 return err; 1568 } 1569 } 1570 return 0; 1571 } 1572 EXPORT_SYMBOL(snd_pcm_suspend_all); 1573 1574 /* resume */ 1575 1576 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1577 { 1578 struct snd_pcm_runtime *runtime = substream->runtime; 1579 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1580 return -ENOSYS; 1581 runtime->trigger_master = substream; 1582 return 0; 1583 } 1584 1585 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1586 { 1587 struct snd_pcm_runtime *runtime = substream->runtime; 1588 if (runtime->trigger_master != substream) 1589 return 0; 1590 /* DMA not running previously? */ 1591 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1592 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1593 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1594 return 0; 1595 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1596 } 1597 1598 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1599 { 1600 if (substream->runtime->trigger_master == substream && 1601 snd_pcm_running(substream)) 1602 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1603 } 1604 1605 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1606 { 1607 struct snd_pcm_runtime *runtime = substream->runtime; 1608 snd_pcm_trigger_tstamp(substream); 1609 runtime->status->state = runtime->status->suspended_state; 1610 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1611 snd_pcm_sync_stop(substream); 1612 } 1613 1614 static const struct action_ops snd_pcm_action_resume = { 1615 .pre_action = snd_pcm_pre_resume, 1616 .do_action = snd_pcm_do_resume, 1617 .undo_action = snd_pcm_undo_resume, 1618 .post_action = snd_pcm_post_resume 1619 }; 1620 1621 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1622 { 1623 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1624 } 1625 1626 #else 1627 1628 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1629 { 1630 return -ENOSYS; 1631 } 1632 1633 #endif /* CONFIG_PM */ 1634 1635 /* 1636 * xrun ioctl 1637 * 1638 * Change the RUNNING stream(s) to XRUN state. 1639 */ 1640 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1641 { 1642 struct snd_pcm_runtime *runtime = substream->runtime; 1643 int result; 1644 1645 snd_pcm_stream_lock_irq(substream); 1646 switch (runtime->status->state) { 1647 case SNDRV_PCM_STATE_XRUN: 1648 result = 0; /* already there */ 1649 break; 1650 case SNDRV_PCM_STATE_RUNNING: 1651 __snd_pcm_xrun(substream); 1652 result = 0; 1653 break; 1654 default: 1655 result = -EBADFD; 1656 } 1657 snd_pcm_stream_unlock_irq(substream); 1658 return result; 1659 } 1660 1661 /* 1662 * reset ioctl 1663 */ 1664 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1665 { 1666 struct snd_pcm_runtime *runtime = substream->runtime; 1667 switch (runtime->status->state) { 1668 case SNDRV_PCM_STATE_RUNNING: 1669 case SNDRV_PCM_STATE_PREPARED: 1670 case SNDRV_PCM_STATE_PAUSED: 1671 case SNDRV_PCM_STATE_SUSPENDED: 1672 return 0; 1673 default: 1674 return -EBADFD; 1675 } 1676 } 1677 1678 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1679 { 1680 struct snd_pcm_runtime *runtime = substream->runtime; 1681 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1682 if (err < 0) 1683 return err; 1684 runtime->hw_ptr_base = 0; 1685 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1686 runtime->status->hw_ptr % runtime->period_size; 1687 runtime->silence_start = runtime->status->hw_ptr; 1688 runtime->silence_filled = 0; 1689 return 0; 1690 } 1691 1692 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1693 { 1694 struct snd_pcm_runtime *runtime = substream->runtime; 1695 runtime->control->appl_ptr = runtime->status->hw_ptr; 1696 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1697 runtime->silence_size > 0) 1698 snd_pcm_playback_silence(substream, ULONG_MAX); 1699 } 1700 1701 static const struct action_ops snd_pcm_action_reset = { 1702 .pre_action = snd_pcm_pre_reset, 1703 .do_action = snd_pcm_do_reset, 1704 .post_action = snd_pcm_post_reset 1705 }; 1706 1707 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1708 { 1709 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1710 } 1711 1712 /* 1713 * prepare ioctl 1714 */ 1715 /* we use the second argument for updating f_flags */ 1716 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1717 int f_flags) 1718 { 1719 struct snd_pcm_runtime *runtime = substream->runtime; 1720 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1721 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1722 return -EBADFD; 1723 if (snd_pcm_running(substream)) 1724 return -EBUSY; 1725 substream->f_flags = f_flags; 1726 return 0; 1727 } 1728 1729 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1730 { 1731 int err; 1732 snd_pcm_sync_stop(substream); 1733 err = substream->ops->prepare(substream); 1734 if (err < 0) 1735 return err; 1736 return snd_pcm_do_reset(substream, 0); 1737 } 1738 1739 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1740 { 1741 struct snd_pcm_runtime *runtime = substream->runtime; 1742 runtime->control->appl_ptr = runtime->status->hw_ptr; 1743 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1744 } 1745 1746 static const struct action_ops snd_pcm_action_prepare = { 1747 .pre_action = snd_pcm_pre_prepare, 1748 .do_action = snd_pcm_do_prepare, 1749 .post_action = snd_pcm_post_prepare 1750 }; 1751 1752 /** 1753 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1754 * @substream: the PCM substream instance 1755 * @file: file to refer f_flags 1756 * 1757 * Return: Zero if successful, or a negative error code. 1758 */ 1759 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1760 struct file *file) 1761 { 1762 int f_flags; 1763 1764 if (file) 1765 f_flags = file->f_flags; 1766 else 1767 f_flags = substream->f_flags; 1768 1769 snd_pcm_stream_lock_irq(substream); 1770 switch (substream->runtime->status->state) { 1771 case SNDRV_PCM_STATE_PAUSED: 1772 snd_pcm_pause(substream, 0); 1773 /* fallthru */ 1774 case SNDRV_PCM_STATE_SUSPENDED: 1775 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1776 break; 1777 } 1778 snd_pcm_stream_unlock_irq(substream); 1779 1780 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1781 substream, f_flags); 1782 } 1783 1784 /* 1785 * drain ioctl 1786 */ 1787 1788 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1789 { 1790 struct snd_pcm_runtime *runtime = substream->runtime; 1791 switch (runtime->status->state) { 1792 case SNDRV_PCM_STATE_OPEN: 1793 case SNDRV_PCM_STATE_DISCONNECTED: 1794 case SNDRV_PCM_STATE_SUSPENDED: 1795 return -EBADFD; 1796 } 1797 runtime->trigger_master = substream; 1798 return 0; 1799 } 1800 1801 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1802 { 1803 struct snd_pcm_runtime *runtime = substream->runtime; 1804 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1805 switch (runtime->status->state) { 1806 case SNDRV_PCM_STATE_PREPARED: 1807 /* start playback stream if possible */ 1808 if (! snd_pcm_playback_empty(substream)) { 1809 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1810 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1811 } else { 1812 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1813 } 1814 break; 1815 case SNDRV_PCM_STATE_RUNNING: 1816 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1817 break; 1818 case SNDRV_PCM_STATE_XRUN: 1819 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1820 break; 1821 default: 1822 break; 1823 } 1824 } else { 1825 /* stop running stream */ 1826 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1827 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1828 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1829 snd_pcm_do_stop(substream, new_state); 1830 snd_pcm_post_stop(substream, new_state); 1831 } 1832 } 1833 1834 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1835 runtime->trigger_master == substream && 1836 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1837 return substream->ops->trigger(substream, 1838 SNDRV_PCM_TRIGGER_DRAIN); 1839 1840 return 0; 1841 } 1842 1843 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1844 { 1845 } 1846 1847 static const struct action_ops snd_pcm_action_drain_init = { 1848 .pre_action = snd_pcm_pre_drain_init, 1849 .do_action = snd_pcm_do_drain_init, 1850 .post_action = snd_pcm_post_drain_init 1851 }; 1852 1853 /* 1854 * Drain the stream(s). 1855 * When the substream is linked, sync until the draining of all playback streams 1856 * is finished. 1857 * After this call, all streams are supposed to be either SETUP or DRAINING 1858 * (capture only) state. 1859 */ 1860 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1861 struct file *file) 1862 { 1863 struct snd_card *card; 1864 struct snd_pcm_runtime *runtime; 1865 struct snd_pcm_substream *s; 1866 struct snd_pcm_group *group; 1867 wait_queue_entry_t wait; 1868 int result = 0; 1869 int nonblock = 0; 1870 1871 card = substream->pcm->card; 1872 runtime = substream->runtime; 1873 1874 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1875 return -EBADFD; 1876 1877 if (file) { 1878 if (file->f_flags & O_NONBLOCK) 1879 nonblock = 1; 1880 } else if (substream->f_flags & O_NONBLOCK) 1881 nonblock = 1; 1882 1883 snd_pcm_stream_lock_irq(substream); 1884 /* resume pause */ 1885 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1886 snd_pcm_pause(substream, 0); 1887 1888 /* pre-start/stop - all running streams are changed to DRAINING state */ 1889 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1890 if (result < 0) 1891 goto unlock; 1892 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1893 if (nonblock) { 1894 result = -EAGAIN; 1895 goto unlock; 1896 } 1897 1898 for (;;) { 1899 long tout; 1900 struct snd_pcm_runtime *to_check; 1901 if (signal_pending(current)) { 1902 result = -ERESTARTSYS; 1903 break; 1904 } 1905 /* find a substream to drain */ 1906 to_check = NULL; 1907 group = snd_pcm_stream_group_ref(substream); 1908 snd_pcm_group_for_each_entry(s, substream) { 1909 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1910 continue; 1911 runtime = s->runtime; 1912 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1913 to_check = runtime; 1914 break; 1915 } 1916 } 1917 snd_pcm_group_unref(group, substream); 1918 if (!to_check) 1919 break; /* all drained */ 1920 init_waitqueue_entry(&wait, current); 1921 set_current_state(TASK_INTERRUPTIBLE); 1922 add_wait_queue(&to_check->sleep, &wait); 1923 snd_pcm_stream_unlock_irq(substream); 1924 if (runtime->no_period_wakeup) 1925 tout = MAX_SCHEDULE_TIMEOUT; 1926 else { 1927 tout = 10; 1928 if (runtime->rate) { 1929 long t = runtime->period_size * 2 / runtime->rate; 1930 tout = max(t, tout); 1931 } 1932 tout = msecs_to_jiffies(tout * 1000); 1933 } 1934 tout = schedule_timeout(tout); 1935 1936 snd_pcm_stream_lock_irq(substream); 1937 group = snd_pcm_stream_group_ref(substream); 1938 snd_pcm_group_for_each_entry(s, substream) { 1939 if (s->runtime == to_check) { 1940 remove_wait_queue(&to_check->sleep, &wait); 1941 break; 1942 } 1943 } 1944 snd_pcm_group_unref(group, substream); 1945 1946 if (card->shutdown) { 1947 result = -ENODEV; 1948 break; 1949 } 1950 if (tout == 0) { 1951 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1952 result = -ESTRPIPE; 1953 else { 1954 dev_dbg(substream->pcm->card->dev, 1955 "playback drain error (DMA or IRQ trouble?)\n"); 1956 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1957 result = -EIO; 1958 } 1959 break; 1960 } 1961 } 1962 1963 unlock: 1964 snd_pcm_stream_unlock_irq(substream); 1965 1966 return result; 1967 } 1968 1969 /* 1970 * drop ioctl 1971 * 1972 * Immediately put all linked substreams into SETUP state. 1973 */ 1974 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1975 { 1976 struct snd_pcm_runtime *runtime; 1977 int result = 0; 1978 1979 if (PCM_RUNTIME_CHECK(substream)) 1980 return -ENXIO; 1981 runtime = substream->runtime; 1982 1983 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1984 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1985 return -EBADFD; 1986 1987 snd_pcm_stream_lock_irq(substream); 1988 /* resume pause */ 1989 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1990 snd_pcm_pause(substream, 0); 1991 1992 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1993 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1994 snd_pcm_stream_unlock_irq(substream); 1995 1996 return result; 1997 } 1998 1999 2000 static bool is_pcm_file(struct file *file) 2001 { 2002 struct inode *inode = file_inode(file); 2003 struct snd_pcm *pcm; 2004 unsigned int minor; 2005 2006 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 2007 return false; 2008 minor = iminor(inode); 2009 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2010 if (!pcm) 2011 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2012 if (!pcm) 2013 return false; 2014 snd_card_unref(pcm->card); 2015 return true; 2016 } 2017 2018 /* 2019 * PCM link handling 2020 */ 2021 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 2022 { 2023 int res = 0; 2024 struct snd_pcm_file *pcm_file; 2025 struct snd_pcm_substream *substream1; 2026 struct snd_pcm_group *group, *target_group; 2027 bool nonatomic = substream->pcm->nonatomic; 2028 struct fd f = fdget(fd); 2029 2030 if (!f.file) 2031 return -EBADFD; 2032 if (!is_pcm_file(f.file)) { 2033 res = -EBADFD; 2034 goto _badf; 2035 } 2036 pcm_file = f.file->private_data; 2037 substream1 = pcm_file->substream; 2038 group = kzalloc(sizeof(*group), GFP_KERNEL); 2039 if (!group) { 2040 res = -ENOMEM; 2041 goto _nolock; 2042 } 2043 snd_pcm_group_init(group); 2044 2045 down_write(&snd_pcm_link_rwsem); 2046 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 2047 substream->runtime->status->state != substream1->runtime->status->state || 2048 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2049 res = -EBADFD; 2050 goto _end; 2051 } 2052 if (snd_pcm_stream_linked(substream1)) { 2053 res = -EALREADY; 2054 goto _end; 2055 } 2056 2057 snd_pcm_stream_lock_irq(substream); 2058 if (!snd_pcm_stream_linked(substream)) { 2059 snd_pcm_group_assign(substream, group); 2060 group = NULL; /* assigned, don't free this one below */ 2061 } 2062 target_group = substream->group; 2063 snd_pcm_stream_unlock_irq(substream); 2064 2065 snd_pcm_group_lock_irq(target_group, nonatomic); 2066 snd_pcm_stream_lock(substream1); 2067 snd_pcm_group_assign(substream1, target_group); 2068 refcount_inc(&target_group->refs); 2069 snd_pcm_stream_unlock(substream1); 2070 snd_pcm_group_unlock_irq(target_group, nonatomic); 2071 _end: 2072 up_write(&snd_pcm_link_rwsem); 2073 _nolock: 2074 kfree(group); 2075 _badf: 2076 fdput(f); 2077 return res; 2078 } 2079 2080 static void relink_to_local(struct snd_pcm_substream *substream) 2081 { 2082 snd_pcm_stream_lock(substream); 2083 snd_pcm_group_assign(substream, &substream->self_group); 2084 snd_pcm_stream_unlock(substream); 2085 } 2086 2087 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2088 { 2089 struct snd_pcm_group *group; 2090 bool nonatomic = substream->pcm->nonatomic; 2091 bool do_free = false; 2092 int res = 0; 2093 2094 down_write(&snd_pcm_link_rwsem); 2095 2096 if (!snd_pcm_stream_linked(substream)) { 2097 res = -EALREADY; 2098 goto _end; 2099 } 2100 2101 group = substream->group; 2102 snd_pcm_group_lock_irq(group, nonatomic); 2103 2104 relink_to_local(substream); 2105 refcount_dec(&group->refs); 2106 2107 /* detach the last stream, too */ 2108 if (list_is_singular(&group->substreams)) { 2109 relink_to_local(list_first_entry(&group->substreams, 2110 struct snd_pcm_substream, 2111 link_list)); 2112 do_free = refcount_dec_and_test(&group->refs); 2113 } 2114 2115 snd_pcm_group_unlock_irq(group, nonatomic); 2116 if (do_free) 2117 kfree(group); 2118 2119 _end: 2120 up_write(&snd_pcm_link_rwsem); 2121 return res; 2122 } 2123 2124 /* 2125 * hw configurator 2126 */ 2127 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2128 struct snd_pcm_hw_rule *rule) 2129 { 2130 struct snd_interval t; 2131 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2132 hw_param_interval_c(params, rule->deps[1]), &t); 2133 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2134 } 2135 2136 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2137 struct snd_pcm_hw_rule *rule) 2138 { 2139 struct snd_interval t; 2140 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2141 hw_param_interval_c(params, rule->deps[1]), &t); 2142 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2143 } 2144 2145 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2146 struct snd_pcm_hw_rule *rule) 2147 { 2148 struct snd_interval t; 2149 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2150 hw_param_interval_c(params, rule->deps[1]), 2151 (unsigned long) rule->private, &t); 2152 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2153 } 2154 2155 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2156 struct snd_pcm_hw_rule *rule) 2157 { 2158 struct snd_interval t; 2159 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2160 (unsigned long) rule->private, 2161 hw_param_interval_c(params, rule->deps[1]), &t); 2162 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2163 } 2164 2165 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2166 struct snd_pcm_hw_rule *rule) 2167 { 2168 unsigned int k; 2169 const struct snd_interval *i = 2170 hw_param_interval_c(params, rule->deps[0]); 2171 struct snd_mask m; 2172 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2173 snd_mask_any(&m); 2174 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2175 int bits; 2176 if (! snd_mask_test(mask, k)) 2177 continue; 2178 bits = snd_pcm_format_physical_width(k); 2179 if (bits <= 0) 2180 continue; /* ignore invalid formats */ 2181 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2182 snd_mask_reset(&m, k); 2183 } 2184 return snd_mask_refine(mask, &m); 2185 } 2186 2187 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2188 struct snd_pcm_hw_rule *rule) 2189 { 2190 struct snd_interval t; 2191 unsigned int k; 2192 t.min = UINT_MAX; 2193 t.max = 0; 2194 t.openmin = 0; 2195 t.openmax = 0; 2196 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2197 int bits; 2198 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2199 continue; 2200 bits = snd_pcm_format_physical_width(k); 2201 if (bits <= 0) 2202 continue; /* ignore invalid formats */ 2203 if (t.min > (unsigned)bits) 2204 t.min = bits; 2205 if (t.max < (unsigned)bits) 2206 t.max = bits; 2207 } 2208 t.integer = 1; 2209 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2210 } 2211 2212 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2213 #error "Change this table" 2214 #endif 2215 2216 static const unsigned int rates[] = { 2217 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2218 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000 2219 }; 2220 2221 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2222 .count = ARRAY_SIZE(rates), 2223 .list = rates, 2224 }; 2225 2226 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2227 struct snd_pcm_hw_rule *rule) 2228 { 2229 struct snd_pcm_hardware *hw = rule->private; 2230 return snd_interval_list(hw_param_interval(params, rule->var), 2231 snd_pcm_known_rates.count, 2232 snd_pcm_known_rates.list, hw->rates); 2233 } 2234 2235 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2236 struct snd_pcm_hw_rule *rule) 2237 { 2238 struct snd_interval t; 2239 struct snd_pcm_substream *substream = rule->private; 2240 t.min = 0; 2241 t.max = substream->buffer_bytes_max; 2242 t.openmin = 0; 2243 t.openmax = 0; 2244 t.integer = 1; 2245 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2246 } 2247 2248 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2249 { 2250 struct snd_pcm_runtime *runtime = substream->runtime; 2251 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2252 int k, err; 2253 2254 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2255 snd_mask_any(constrs_mask(constrs, k)); 2256 } 2257 2258 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2259 snd_interval_any(constrs_interval(constrs, k)); 2260 } 2261 2262 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2263 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2264 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2265 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2266 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2267 2268 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2269 snd_pcm_hw_rule_format, NULL, 2270 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2271 if (err < 0) 2272 return err; 2273 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2274 snd_pcm_hw_rule_sample_bits, NULL, 2275 SNDRV_PCM_HW_PARAM_FORMAT, 2276 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2277 if (err < 0) 2278 return err; 2279 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2280 snd_pcm_hw_rule_div, NULL, 2281 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2282 if (err < 0) 2283 return err; 2284 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2285 snd_pcm_hw_rule_mul, NULL, 2286 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2287 if (err < 0) 2288 return err; 2289 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2290 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2291 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2292 if (err < 0) 2293 return err; 2294 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2295 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2296 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2297 if (err < 0) 2298 return err; 2299 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2300 snd_pcm_hw_rule_div, NULL, 2301 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2302 if (err < 0) 2303 return err; 2304 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2305 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2306 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2307 if (err < 0) 2308 return err; 2309 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2310 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2311 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2312 if (err < 0) 2313 return err; 2314 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2315 snd_pcm_hw_rule_div, NULL, 2316 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2317 if (err < 0) 2318 return err; 2319 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2320 snd_pcm_hw_rule_div, NULL, 2321 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2322 if (err < 0) 2323 return err; 2324 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2325 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2326 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2327 if (err < 0) 2328 return err; 2329 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2330 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2331 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2332 if (err < 0) 2333 return err; 2334 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2335 snd_pcm_hw_rule_mul, NULL, 2336 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2337 if (err < 0) 2338 return err; 2339 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2340 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2341 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2342 if (err < 0) 2343 return err; 2344 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2345 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2346 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2347 if (err < 0) 2348 return err; 2349 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2350 snd_pcm_hw_rule_muldivk, (void*) 8, 2351 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2352 if (err < 0) 2353 return err; 2354 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2355 snd_pcm_hw_rule_muldivk, (void*) 8, 2356 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2357 if (err < 0) 2358 return err; 2359 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2360 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2361 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2362 if (err < 0) 2363 return err; 2364 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2365 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2366 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2367 if (err < 0) 2368 return err; 2369 return 0; 2370 } 2371 2372 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2373 { 2374 struct snd_pcm_runtime *runtime = substream->runtime; 2375 struct snd_pcm_hardware *hw = &runtime->hw; 2376 int err; 2377 unsigned int mask = 0; 2378 2379 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2380 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2381 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2382 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2383 if (hw_support_mmap(substream)) { 2384 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2385 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2386 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2387 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2388 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2389 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2390 } 2391 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2392 if (err < 0) 2393 return err; 2394 2395 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2396 if (err < 0) 2397 return err; 2398 2399 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2400 if (err < 0) 2401 return err; 2402 2403 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2404 hw->channels_min, hw->channels_max); 2405 if (err < 0) 2406 return err; 2407 2408 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2409 hw->rate_min, hw->rate_max); 2410 if (err < 0) 2411 return err; 2412 2413 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2414 hw->period_bytes_min, hw->period_bytes_max); 2415 if (err < 0) 2416 return err; 2417 2418 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2419 hw->periods_min, hw->periods_max); 2420 if (err < 0) 2421 return err; 2422 2423 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2424 hw->period_bytes_min, hw->buffer_bytes_max); 2425 if (err < 0) 2426 return err; 2427 2428 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2429 snd_pcm_hw_rule_buffer_bytes_max, substream, 2430 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2431 if (err < 0) 2432 return err; 2433 2434 /* FIXME: remove */ 2435 if (runtime->dma_bytes) { 2436 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2437 if (err < 0) 2438 return err; 2439 } 2440 2441 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2442 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2443 snd_pcm_hw_rule_rate, hw, 2444 SNDRV_PCM_HW_PARAM_RATE, -1); 2445 if (err < 0) 2446 return err; 2447 } 2448 2449 /* FIXME: this belong to lowlevel */ 2450 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2451 2452 return 0; 2453 } 2454 2455 static void pcm_release_private(struct snd_pcm_substream *substream) 2456 { 2457 if (snd_pcm_stream_linked(substream)) 2458 snd_pcm_unlink(substream); 2459 } 2460 2461 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2462 { 2463 substream->ref_count--; 2464 if (substream->ref_count > 0) 2465 return; 2466 2467 snd_pcm_drop(substream); 2468 if (substream->hw_opened) { 2469 if (substream->ops->hw_free && 2470 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2471 substream->ops->hw_free(substream); 2472 substream->ops->close(substream); 2473 substream->hw_opened = 0; 2474 } 2475 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2476 pm_qos_remove_request(&substream->latency_pm_qos_req); 2477 if (substream->pcm_release) { 2478 substream->pcm_release(substream); 2479 substream->pcm_release = NULL; 2480 } 2481 snd_pcm_detach_substream(substream); 2482 } 2483 EXPORT_SYMBOL(snd_pcm_release_substream); 2484 2485 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2486 struct file *file, 2487 struct snd_pcm_substream **rsubstream) 2488 { 2489 struct snd_pcm_substream *substream; 2490 int err; 2491 2492 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2493 if (err < 0) 2494 return err; 2495 if (substream->ref_count > 1) { 2496 *rsubstream = substream; 2497 return 0; 2498 } 2499 2500 err = snd_pcm_hw_constraints_init(substream); 2501 if (err < 0) { 2502 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2503 goto error; 2504 } 2505 2506 if ((err = substream->ops->open(substream)) < 0) 2507 goto error; 2508 2509 substream->hw_opened = 1; 2510 2511 err = snd_pcm_hw_constraints_complete(substream); 2512 if (err < 0) { 2513 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2514 goto error; 2515 } 2516 2517 *rsubstream = substream; 2518 return 0; 2519 2520 error: 2521 snd_pcm_release_substream(substream); 2522 return err; 2523 } 2524 EXPORT_SYMBOL(snd_pcm_open_substream); 2525 2526 static int snd_pcm_open_file(struct file *file, 2527 struct snd_pcm *pcm, 2528 int stream) 2529 { 2530 struct snd_pcm_file *pcm_file; 2531 struct snd_pcm_substream *substream; 2532 int err; 2533 2534 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2535 if (err < 0) 2536 return err; 2537 2538 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2539 if (pcm_file == NULL) { 2540 snd_pcm_release_substream(substream); 2541 return -ENOMEM; 2542 } 2543 pcm_file->substream = substream; 2544 if (substream->ref_count == 1) 2545 substream->pcm_release = pcm_release_private; 2546 file->private_data = pcm_file; 2547 2548 return 0; 2549 } 2550 2551 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2552 { 2553 struct snd_pcm *pcm; 2554 int err = nonseekable_open(inode, file); 2555 if (err < 0) 2556 return err; 2557 pcm = snd_lookup_minor_data(iminor(inode), 2558 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2559 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2560 if (pcm) 2561 snd_card_unref(pcm->card); 2562 return err; 2563 } 2564 2565 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2566 { 2567 struct snd_pcm *pcm; 2568 int err = nonseekable_open(inode, file); 2569 if (err < 0) 2570 return err; 2571 pcm = snd_lookup_minor_data(iminor(inode), 2572 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2573 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2574 if (pcm) 2575 snd_card_unref(pcm->card); 2576 return err; 2577 } 2578 2579 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2580 { 2581 int err; 2582 wait_queue_entry_t wait; 2583 2584 if (pcm == NULL) { 2585 err = -ENODEV; 2586 goto __error1; 2587 } 2588 err = snd_card_file_add(pcm->card, file); 2589 if (err < 0) 2590 goto __error1; 2591 if (!try_module_get(pcm->card->module)) { 2592 err = -EFAULT; 2593 goto __error2; 2594 } 2595 init_waitqueue_entry(&wait, current); 2596 add_wait_queue(&pcm->open_wait, &wait); 2597 mutex_lock(&pcm->open_mutex); 2598 while (1) { 2599 err = snd_pcm_open_file(file, pcm, stream); 2600 if (err >= 0) 2601 break; 2602 if (err == -EAGAIN) { 2603 if (file->f_flags & O_NONBLOCK) { 2604 err = -EBUSY; 2605 break; 2606 } 2607 } else 2608 break; 2609 set_current_state(TASK_INTERRUPTIBLE); 2610 mutex_unlock(&pcm->open_mutex); 2611 schedule(); 2612 mutex_lock(&pcm->open_mutex); 2613 if (pcm->card->shutdown) { 2614 err = -ENODEV; 2615 break; 2616 } 2617 if (signal_pending(current)) { 2618 err = -ERESTARTSYS; 2619 break; 2620 } 2621 } 2622 remove_wait_queue(&pcm->open_wait, &wait); 2623 mutex_unlock(&pcm->open_mutex); 2624 if (err < 0) 2625 goto __error; 2626 return err; 2627 2628 __error: 2629 module_put(pcm->card->module); 2630 __error2: 2631 snd_card_file_remove(pcm->card, file); 2632 __error1: 2633 return err; 2634 } 2635 2636 static int snd_pcm_release(struct inode *inode, struct file *file) 2637 { 2638 struct snd_pcm *pcm; 2639 struct snd_pcm_substream *substream; 2640 struct snd_pcm_file *pcm_file; 2641 2642 pcm_file = file->private_data; 2643 substream = pcm_file->substream; 2644 if (snd_BUG_ON(!substream)) 2645 return -ENXIO; 2646 pcm = substream->pcm; 2647 mutex_lock(&pcm->open_mutex); 2648 snd_pcm_release_substream(substream); 2649 kfree(pcm_file); 2650 mutex_unlock(&pcm->open_mutex); 2651 wake_up(&pcm->open_wait); 2652 module_put(pcm->card->module); 2653 snd_card_file_remove(pcm->card, file); 2654 return 0; 2655 } 2656 2657 /* check and update PCM state; return 0 or a negative error 2658 * call this inside PCM lock 2659 */ 2660 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2661 { 2662 switch (substream->runtime->status->state) { 2663 case SNDRV_PCM_STATE_DRAINING: 2664 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2665 return -EBADFD; 2666 /* Fall through */ 2667 case SNDRV_PCM_STATE_RUNNING: 2668 return snd_pcm_update_hw_ptr(substream); 2669 case SNDRV_PCM_STATE_PREPARED: 2670 case SNDRV_PCM_STATE_PAUSED: 2671 return 0; 2672 case SNDRV_PCM_STATE_SUSPENDED: 2673 return -ESTRPIPE; 2674 case SNDRV_PCM_STATE_XRUN: 2675 return -EPIPE; 2676 default: 2677 return -EBADFD; 2678 } 2679 } 2680 2681 /* increase the appl_ptr; returns the processed frames or a negative error */ 2682 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2683 snd_pcm_uframes_t frames, 2684 snd_pcm_sframes_t avail) 2685 { 2686 struct snd_pcm_runtime *runtime = substream->runtime; 2687 snd_pcm_sframes_t appl_ptr; 2688 int ret; 2689 2690 if (avail <= 0) 2691 return 0; 2692 if (frames > (snd_pcm_uframes_t)avail) 2693 frames = avail; 2694 appl_ptr = runtime->control->appl_ptr + frames; 2695 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2696 appl_ptr -= runtime->boundary; 2697 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2698 return ret < 0 ? ret : frames; 2699 } 2700 2701 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2702 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2703 snd_pcm_uframes_t frames, 2704 snd_pcm_sframes_t avail) 2705 { 2706 struct snd_pcm_runtime *runtime = substream->runtime; 2707 snd_pcm_sframes_t appl_ptr; 2708 int ret; 2709 2710 if (avail <= 0) 2711 return 0; 2712 if (frames > (snd_pcm_uframes_t)avail) 2713 frames = avail; 2714 appl_ptr = runtime->control->appl_ptr - frames; 2715 if (appl_ptr < 0) 2716 appl_ptr += runtime->boundary; 2717 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2718 /* NOTE: we return zero for errors because PulseAudio gets depressed 2719 * upon receiving an error from rewind ioctl and stops processing 2720 * any longer. Returning zero means that no rewind is done, so 2721 * it's not absolutely wrong to answer like that. 2722 */ 2723 return ret < 0 ? 0 : frames; 2724 } 2725 2726 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2727 snd_pcm_uframes_t frames) 2728 { 2729 snd_pcm_sframes_t ret; 2730 2731 if (frames == 0) 2732 return 0; 2733 2734 snd_pcm_stream_lock_irq(substream); 2735 ret = do_pcm_hwsync(substream); 2736 if (!ret) 2737 ret = rewind_appl_ptr(substream, frames, 2738 snd_pcm_hw_avail(substream)); 2739 snd_pcm_stream_unlock_irq(substream); 2740 return ret; 2741 } 2742 2743 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2744 snd_pcm_uframes_t frames) 2745 { 2746 snd_pcm_sframes_t ret; 2747 2748 if (frames == 0) 2749 return 0; 2750 2751 snd_pcm_stream_lock_irq(substream); 2752 ret = do_pcm_hwsync(substream); 2753 if (!ret) 2754 ret = forward_appl_ptr(substream, frames, 2755 snd_pcm_avail(substream)); 2756 snd_pcm_stream_unlock_irq(substream); 2757 return ret; 2758 } 2759 2760 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2761 { 2762 int err; 2763 2764 snd_pcm_stream_lock_irq(substream); 2765 err = do_pcm_hwsync(substream); 2766 snd_pcm_stream_unlock_irq(substream); 2767 return err; 2768 } 2769 2770 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2771 snd_pcm_sframes_t *delay) 2772 { 2773 int err; 2774 snd_pcm_sframes_t n = 0; 2775 2776 snd_pcm_stream_lock_irq(substream); 2777 err = do_pcm_hwsync(substream); 2778 if (!err) 2779 n = snd_pcm_calc_delay(substream); 2780 snd_pcm_stream_unlock_irq(substream); 2781 if (!err) 2782 *delay = n; 2783 return err; 2784 } 2785 2786 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2787 struct snd_pcm_sync_ptr __user *_sync_ptr) 2788 { 2789 struct snd_pcm_runtime *runtime = substream->runtime; 2790 struct snd_pcm_sync_ptr sync_ptr; 2791 volatile struct snd_pcm_mmap_status *status; 2792 volatile struct snd_pcm_mmap_control *control; 2793 int err; 2794 2795 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2796 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2797 return -EFAULT; 2798 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2799 return -EFAULT; 2800 status = runtime->status; 2801 control = runtime->control; 2802 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2803 err = snd_pcm_hwsync(substream); 2804 if (err < 0) 2805 return err; 2806 } 2807 snd_pcm_stream_lock_irq(substream); 2808 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2809 err = pcm_lib_apply_appl_ptr(substream, 2810 sync_ptr.c.control.appl_ptr); 2811 if (err < 0) { 2812 snd_pcm_stream_unlock_irq(substream); 2813 return err; 2814 } 2815 } else { 2816 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2817 } 2818 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2819 control->avail_min = sync_ptr.c.control.avail_min; 2820 else 2821 sync_ptr.c.control.avail_min = control->avail_min; 2822 sync_ptr.s.status.state = status->state; 2823 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2824 sync_ptr.s.status.tstamp = status->tstamp; 2825 sync_ptr.s.status.suspended_state = status->suspended_state; 2826 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2827 snd_pcm_stream_unlock_irq(substream); 2828 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2829 return -EFAULT; 2830 return 0; 2831 } 2832 2833 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2834 { 2835 struct snd_pcm_runtime *runtime = substream->runtime; 2836 int arg; 2837 2838 if (get_user(arg, _arg)) 2839 return -EFAULT; 2840 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2841 return -EINVAL; 2842 runtime->tstamp_type = arg; 2843 return 0; 2844 } 2845 2846 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2847 struct snd_xferi __user *_xferi) 2848 { 2849 struct snd_xferi xferi; 2850 struct snd_pcm_runtime *runtime = substream->runtime; 2851 snd_pcm_sframes_t result; 2852 2853 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2854 return -EBADFD; 2855 if (put_user(0, &_xferi->result)) 2856 return -EFAULT; 2857 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2858 return -EFAULT; 2859 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2860 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2861 else 2862 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2863 __put_user(result, &_xferi->result); 2864 return result < 0 ? result : 0; 2865 } 2866 2867 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2868 struct snd_xfern __user *_xfern) 2869 { 2870 struct snd_xfern xfern; 2871 struct snd_pcm_runtime *runtime = substream->runtime; 2872 void *bufs; 2873 snd_pcm_sframes_t result; 2874 2875 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2876 return -EBADFD; 2877 if (runtime->channels > 128) 2878 return -EINVAL; 2879 if (put_user(0, &_xfern->result)) 2880 return -EFAULT; 2881 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2882 return -EFAULT; 2883 2884 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2885 if (IS_ERR(bufs)) 2886 return PTR_ERR(bufs); 2887 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2888 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2889 else 2890 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2891 kfree(bufs); 2892 __put_user(result, &_xfern->result); 2893 return result < 0 ? result : 0; 2894 } 2895 2896 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2897 snd_pcm_uframes_t __user *_frames) 2898 { 2899 snd_pcm_uframes_t frames; 2900 snd_pcm_sframes_t result; 2901 2902 if (get_user(frames, _frames)) 2903 return -EFAULT; 2904 if (put_user(0, _frames)) 2905 return -EFAULT; 2906 result = snd_pcm_rewind(substream, frames); 2907 __put_user(result, _frames); 2908 return result < 0 ? result : 0; 2909 } 2910 2911 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2912 snd_pcm_uframes_t __user *_frames) 2913 { 2914 snd_pcm_uframes_t frames; 2915 snd_pcm_sframes_t result; 2916 2917 if (get_user(frames, _frames)) 2918 return -EFAULT; 2919 if (put_user(0, _frames)) 2920 return -EFAULT; 2921 result = snd_pcm_forward(substream, frames); 2922 __put_user(result, _frames); 2923 return result < 0 ? result : 0; 2924 } 2925 2926 static int snd_pcm_common_ioctl(struct file *file, 2927 struct snd_pcm_substream *substream, 2928 unsigned int cmd, void __user *arg) 2929 { 2930 struct snd_pcm_file *pcm_file = file->private_data; 2931 int res; 2932 2933 if (PCM_RUNTIME_CHECK(substream)) 2934 return -ENXIO; 2935 2936 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2937 if (res < 0) 2938 return res; 2939 2940 switch (cmd) { 2941 case SNDRV_PCM_IOCTL_PVERSION: 2942 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2943 case SNDRV_PCM_IOCTL_INFO: 2944 return snd_pcm_info_user(substream, arg); 2945 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2946 return 0; 2947 case SNDRV_PCM_IOCTL_TTSTAMP: 2948 return snd_pcm_tstamp(substream, arg); 2949 case SNDRV_PCM_IOCTL_USER_PVERSION: 2950 if (get_user(pcm_file->user_pversion, 2951 (unsigned int __user *)arg)) 2952 return -EFAULT; 2953 return 0; 2954 case SNDRV_PCM_IOCTL_HW_REFINE: 2955 return snd_pcm_hw_refine_user(substream, arg); 2956 case SNDRV_PCM_IOCTL_HW_PARAMS: 2957 return snd_pcm_hw_params_user(substream, arg); 2958 case SNDRV_PCM_IOCTL_HW_FREE: 2959 return snd_pcm_hw_free(substream); 2960 case SNDRV_PCM_IOCTL_SW_PARAMS: 2961 return snd_pcm_sw_params_user(substream, arg); 2962 case SNDRV_PCM_IOCTL_STATUS: 2963 return snd_pcm_status_user(substream, arg, false); 2964 case SNDRV_PCM_IOCTL_STATUS_EXT: 2965 return snd_pcm_status_user(substream, arg, true); 2966 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2967 return snd_pcm_channel_info_user(substream, arg); 2968 case SNDRV_PCM_IOCTL_PREPARE: 2969 return snd_pcm_prepare(substream, file); 2970 case SNDRV_PCM_IOCTL_RESET: 2971 return snd_pcm_reset(substream); 2972 case SNDRV_PCM_IOCTL_START: 2973 return snd_pcm_start_lock_irq(substream); 2974 case SNDRV_PCM_IOCTL_LINK: 2975 return snd_pcm_link(substream, (int)(unsigned long) arg); 2976 case SNDRV_PCM_IOCTL_UNLINK: 2977 return snd_pcm_unlink(substream); 2978 case SNDRV_PCM_IOCTL_RESUME: 2979 return snd_pcm_resume(substream); 2980 case SNDRV_PCM_IOCTL_XRUN: 2981 return snd_pcm_xrun(substream); 2982 case SNDRV_PCM_IOCTL_HWSYNC: 2983 return snd_pcm_hwsync(substream); 2984 case SNDRV_PCM_IOCTL_DELAY: 2985 { 2986 snd_pcm_sframes_t delay; 2987 snd_pcm_sframes_t __user *res = arg; 2988 int err; 2989 2990 err = snd_pcm_delay(substream, &delay); 2991 if (err) 2992 return err; 2993 if (put_user(delay, res)) 2994 return -EFAULT; 2995 return 0; 2996 } 2997 case SNDRV_PCM_IOCTL_SYNC_PTR: 2998 return snd_pcm_sync_ptr(substream, arg); 2999 #ifdef CONFIG_SND_SUPPORT_OLD_API 3000 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 3001 return snd_pcm_hw_refine_old_user(substream, arg); 3002 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 3003 return snd_pcm_hw_params_old_user(substream, arg); 3004 #endif 3005 case SNDRV_PCM_IOCTL_DRAIN: 3006 return snd_pcm_drain(substream, file); 3007 case SNDRV_PCM_IOCTL_DROP: 3008 return snd_pcm_drop(substream); 3009 case SNDRV_PCM_IOCTL_PAUSE: 3010 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 3011 substream, 3012 (int)(unsigned long)arg); 3013 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 3014 case SNDRV_PCM_IOCTL_READI_FRAMES: 3015 return snd_pcm_xferi_frames_ioctl(substream, arg); 3016 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 3017 case SNDRV_PCM_IOCTL_READN_FRAMES: 3018 return snd_pcm_xfern_frames_ioctl(substream, arg); 3019 case SNDRV_PCM_IOCTL_REWIND: 3020 return snd_pcm_rewind_ioctl(substream, arg); 3021 case SNDRV_PCM_IOCTL_FORWARD: 3022 return snd_pcm_forward_ioctl(substream, arg); 3023 } 3024 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 3025 return -ENOTTY; 3026 } 3027 3028 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 3029 unsigned long arg) 3030 { 3031 struct snd_pcm_file *pcm_file; 3032 3033 pcm_file = file->private_data; 3034 3035 if (((cmd >> 8) & 0xff) != 'A') 3036 return -ENOTTY; 3037 3038 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 3039 (void __user *)arg); 3040 } 3041 3042 /** 3043 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3044 * @substream: PCM substream 3045 * @cmd: IOCTL cmd 3046 * @arg: IOCTL argument 3047 * 3048 * The function is provided primarily for OSS layer and USB gadget drivers, 3049 * and it allows only the limited set of ioctls (hw_params, sw_params, 3050 * prepare, start, drain, drop, forward). 3051 */ 3052 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3053 unsigned int cmd, void *arg) 3054 { 3055 snd_pcm_uframes_t *frames = arg; 3056 snd_pcm_sframes_t result; 3057 3058 switch (cmd) { 3059 case SNDRV_PCM_IOCTL_FORWARD: 3060 { 3061 /* provided only for OSS; capture-only and no value returned */ 3062 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3063 return -EINVAL; 3064 result = snd_pcm_forward(substream, *frames); 3065 return result < 0 ? result : 0; 3066 } 3067 case SNDRV_PCM_IOCTL_HW_PARAMS: 3068 return snd_pcm_hw_params(substream, arg); 3069 case SNDRV_PCM_IOCTL_SW_PARAMS: 3070 return snd_pcm_sw_params(substream, arg); 3071 case SNDRV_PCM_IOCTL_PREPARE: 3072 return snd_pcm_prepare(substream, NULL); 3073 case SNDRV_PCM_IOCTL_START: 3074 return snd_pcm_start_lock_irq(substream); 3075 case SNDRV_PCM_IOCTL_DRAIN: 3076 return snd_pcm_drain(substream, NULL); 3077 case SNDRV_PCM_IOCTL_DROP: 3078 return snd_pcm_drop(substream); 3079 case SNDRV_PCM_IOCTL_DELAY: 3080 return snd_pcm_delay(substream, frames); 3081 default: 3082 return -EINVAL; 3083 } 3084 } 3085 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3086 3087 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3088 loff_t * offset) 3089 { 3090 struct snd_pcm_file *pcm_file; 3091 struct snd_pcm_substream *substream; 3092 struct snd_pcm_runtime *runtime; 3093 snd_pcm_sframes_t result; 3094 3095 pcm_file = file->private_data; 3096 substream = pcm_file->substream; 3097 if (PCM_RUNTIME_CHECK(substream)) 3098 return -ENXIO; 3099 runtime = substream->runtime; 3100 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3101 return -EBADFD; 3102 if (!frame_aligned(runtime, count)) 3103 return -EINVAL; 3104 count = bytes_to_frames(runtime, count); 3105 result = snd_pcm_lib_read(substream, buf, count); 3106 if (result > 0) 3107 result = frames_to_bytes(runtime, result); 3108 return result; 3109 } 3110 3111 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3112 size_t count, loff_t * offset) 3113 { 3114 struct snd_pcm_file *pcm_file; 3115 struct snd_pcm_substream *substream; 3116 struct snd_pcm_runtime *runtime; 3117 snd_pcm_sframes_t result; 3118 3119 pcm_file = file->private_data; 3120 substream = pcm_file->substream; 3121 if (PCM_RUNTIME_CHECK(substream)) 3122 return -ENXIO; 3123 runtime = substream->runtime; 3124 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3125 return -EBADFD; 3126 if (!frame_aligned(runtime, count)) 3127 return -EINVAL; 3128 count = bytes_to_frames(runtime, count); 3129 result = snd_pcm_lib_write(substream, buf, count); 3130 if (result > 0) 3131 result = frames_to_bytes(runtime, result); 3132 return result; 3133 } 3134 3135 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3136 { 3137 struct snd_pcm_file *pcm_file; 3138 struct snd_pcm_substream *substream; 3139 struct snd_pcm_runtime *runtime; 3140 snd_pcm_sframes_t result; 3141 unsigned long i; 3142 void __user **bufs; 3143 snd_pcm_uframes_t frames; 3144 3145 pcm_file = iocb->ki_filp->private_data; 3146 substream = pcm_file->substream; 3147 if (PCM_RUNTIME_CHECK(substream)) 3148 return -ENXIO; 3149 runtime = substream->runtime; 3150 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3151 return -EBADFD; 3152 if (!iter_is_iovec(to)) 3153 return -EINVAL; 3154 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3155 return -EINVAL; 3156 if (!frame_aligned(runtime, to->iov->iov_len)) 3157 return -EINVAL; 3158 frames = bytes_to_samples(runtime, to->iov->iov_len); 3159 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3160 if (bufs == NULL) 3161 return -ENOMEM; 3162 for (i = 0; i < to->nr_segs; ++i) 3163 bufs[i] = to->iov[i].iov_base; 3164 result = snd_pcm_lib_readv(substream, bufs, frames); 3165 if (result > 0) 3166 result = frames_to_bytes(runtime, result); 3167 kfree(bufs); 3168 return result; 3169 } 3170 3171 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3172 { 3173 struct snd_pcm_file *pcm_file; 3174 struct snd_pcm_substream *substream; 3175 struct snd_pcm_runtime *runtime; 3176 snd_pcm_sframes_t result; 3177 unsigned long i; 3178 void __user **bufs; 3179 snd_pcm_uframes_t frames; 3180 3181 pcm_file = iocb->ki_filp->private_data; 3182 substream = pcm_file->substream; 3183 if (PCM_RUNTIME_CHECK(substream)) 3184 return -ENXIO; 3185 runtime = substream->runtime; 3186 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3187 return -EBADFD; 3188 if (!iter_is_iovec(from)) 3189 return -EINVAL; 3190 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3191 !frame_aligned(runtime, from->iov->iov_len)) 3192 return -EINVAL; 3193 frames = bytes_to_samples(runtime, from->iov->iov_len); 3194 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3195 if (bufs == NULL) 3196 return -ENOMEM; 3197 for (i = 0; i < from->nr_segs; ++i) 3198 bufs[i] = from->iov[i].iov_base; 3199 result = snd_pcm_lib_writev(substream, bufs, frames); 3200 if (result > 0) 3201 result = frames_to_bytes(runtime, result); 3202 kfree(bufs); 3203 return result; 3204 } 3205 3206 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3207 { 3208 struct snd_pcm_file *pcm_file; 3209 struct snd_pcm_substream *substream; 3210 struct snd_pcm_runtime *runtime; 3211 __poll_t mask, ok; 3212 snd_pcm_uframes_t avail; 3213 3214 pcm_file = file->private_data; 3215 3216 substream = pcm_file->substream; 3217 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3218 ok = EPOLLOUT | EPOLLWRNORM; 3219 else 3220 ok = EPOLLIN | EPOLLRDNORM; 3221 if (PCM_RUNTIME_CHECK(substream)) 3222 return ok | EPOLLERR; 3223 3224 runtime = substream->runtime; 3225 poll_wait(file, &runtime->sleep, wait); 3226 3227 mask = 0; 3228 snd_pcm_stream_lock_irq(substream); 3229 avail = snd_pcm_avail(substream); 3230 switch (runtime->status->state) { 3231 case SNDRV_PCM_STATE_RUNNING: 3232 case SNDRV_PCM_STATE_PREPARED: 3233 case SNDRV_PCM_STATE_PAUSED: 3234 if (avail >= runtime->control->avail_min) 3235 mask = ok; 3236 break; 3237 case SNDRV_PCM_STATE_DRAINING: 3238 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3239 mask = ok; 3240 if (!avail) 3241 mask |= EPOLLERR; 3242 } 3243 break; 3244 default: 3245 mask = ok | EPOLLERR; 3246 break; 3247 } 3248 snd_pcm_stream_unlock_irq(substream); 3249 return mask; 3250 } 3251 3252 /* 3253 * mmap support 3254 */ 3255 3256 /* 3257 * Only on coherent architectures, we can mmap the status and the control records 3258 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3259 */ 3260 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3261 /* 3262 * mmap status record 3263 */ 3264 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3265 { 3266 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3267 struct snd_pcm_runtime *runtime; 3268 3269 if (substream == NULL) 3270 return VM_FAULT_SIGBUS; 3271 runtime = substream->runtime; 3272 vmf->page = virt_to_page(runtime->status); 3273 get_page(vmf->page); 3274 return 0; 3275 } 3276 3277 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3278 { 3279 .fault = snd_pcm_mmap_status_fault, 3280 }; 3281 3282 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3283 struct vm_area_struct *area) 3284 { 3285 long size; 3286 if (!(area->vm_flags & VM_READ)) 3287 return -EINVAL; 3288 size = area->vm_end - area->vm_start; 3289 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3290 return -EINVAL; 3291 area->vm_ops = &snd_pcm_vm_ops_status; 3292 area->vm_private_data = substream; 3293 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3294 return 0; 3295 } 3296 3297 /* 3298 * mmap control record 3299 */ 3300 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3301 { 3302 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3303 struct snd_pcm_runtime *runtime; 3304 3305 if (substream == NULL) 3306 return VM_FAULT_SIGBUS; 3307 runtime = substream->runtime; 3308 vmf->page = virt_to_page(runtime->control); 3309 get_page(vmf->page); 3310 return 0; 3311 } 3312 3313 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3314 { 3315 .fault = snd_pcm_mmap_control_fault, 3316 }; 3317 3318 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3319 struct vm_area_struct *area) 3320 { 3321 long size; 3322 if (!(area->vm_flags & VM_READ)) 3323 return -EINVAL; 3324 size = area->vm_end - area->vm_start; 3325 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3326 return -EINVAL; 3327 area->vm_ops = &snd_pcm_vm_ops_control; 3328 area->vm_private_data = substream; 3329 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3330 return 0; 3331 } 3332 3333 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3334 { 3335 if (pcm_file->no_compat_mmap) 3336 return false; 3337 /* See pcm_control_mmap_allowed() below. 3338 * Since older alsa-lib requires both status and control mmaps to be 3339 * coupled, we have to disable the status mmap for old alsa-lib, too. 3340 */ 3341 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3342 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3343 return false; 3344 return true; 3345 } 3346 3347 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3348 { 3349 if (pcm_file->no_compat_mmap) 3350 return false; 3351 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3352 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3353 * thus it effectively assures the manual update of appl_ptr. 3354 */ 3355 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3356 return false; 3357 return true; 3358 } 3359 3360 #else /* ! coherent mmap */ 3361 /* 3362 * don't support mmap for status and control records. 3363 */ 3364 #define pcm_status_mmap_allowed(pcm_file) false 3365 #define pcm_control_mmap_allowed(pcm_file) false 3366 3367 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3368 struct vm_area_struct *area) 3369 { 3370 return -ENXIO; 3371 } 3372 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3373 struct vm_area_struct *area) 3374 { 3375 return -ENXIO; 3376 } 3377 #endif /* coherent mmap */ 3378 3379 static inline struct page * 3380 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3381 { 3382 void *vaddr = substream->runtime->dma_area + ofs; 3383 3384 switch (substream->dma_buffer.dev.type) { 3385 #ifdef CONFIG_SND_DMA_SGBUF 3386 case SNDRV_DMA_TYPE_DEV_SG: 3387 case SNDRV_DMA_TYPE_DEV_UC_SG: 3388 return snd_pcm_sgbuf_ops_page(substream, ofs); 3389 #endif /* CONFIG_SND_DMA_SGBUF */ 3390 case SNDRV_DMA_TYPE_VMALLOC: 3391 return vmalloc_to_page(vaddr); 3392 default: 3393 return virt_to_page(vaddr); 3394 } 3395 } 3396 3397 /* 3398 * fault callback for mmapping a RAM page 3399 */ 3400 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3401 { 3402 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3403 struct snd_pcm_runtime *runtime; 3404 unsigned long offset; 3405 struct page * page; 3406 size_t dma_bytes; 3407 3408 if (substream == NULL) 3409 return VM_FAULT_SIGBUS; 3410 runtime = substream->runtime; 3411 offset = vmf->pgoff << PAGE_SHIFT; 3412 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3413 if (offset > dma_bytes - PAGE_SIZE) 3414 return VM_FAULT_SIGBUS; 3415 if (substream->ops->page) 3416 page = substream->ops->page(substream, offset); 3417 else 3418 page = snd_pcm_default_page_ops(substream, offset); 3419 if (!page) 3420 return VM_FAULT_SIGBUS; 3421 get_page(page); 3422 vmf->page = page; 3423 return 0; 3424 } 3425 3426 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3427 .open = snd_pcm_mmap_data_open, 3428 .close = snd_pcm_mmap_data_close, 3429 }; 3430 3431 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3432 .open = snd_pcm_mmap_data_open, 3433 .close = snd_pcm_mmap_data_close, 3434 .fault = snd_pcm_mmap_data_fault, 3435 }; 3436 3437 /* 3438 * mmap the DMA buffer on RAM 3439 */ 3440 3441 /** 3442 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3443 * @substream: PCM substream 3444 * @area: VMA 3445 * 3446 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3447 * this function is invoked implicitly. 3448 */ 3449 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3450 struct vm_area_struct *area) 3451 { 3452 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3453 #ifdef CONFIG_GENERIC_ALLOCATOR 3454 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3455 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3456 return remap_pfn_range(area, area->vm_start, 3457 substream->dma_buffer.addr >> PAGE_SHIFT, 3458 area->vm_end - area->vm_start, area->vm_page_prot); 3459 } 3460 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3461 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3462 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3463 (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV || 3464 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_UC)) 3465 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3466 area, 3467 substream->runtime->dma_area, 3468 substream->runtime->dma_addr, 3469 substream->runtime->dma_bytes); 3470 #endif /* CONFIG_X86 */ 3471 /* mmap with fault handler */ 3472 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3473 return 0; 3474 } 3475 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3476 3477 /* 3478 * mmap the DMA buffer on I/O memory area 3479 */ 3480 #if SNDRV_PCM_INFO_MMAP_IOMEM 3481 /** 3482 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3483 * @substream: PCM substream 3484 * @area: VMA 3485 * 3486 * When your hardware uses the iomapped pages as the hardware buffer and 3487 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3488 * is supposed to work only on limited architectures. 3489 */ 3490 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3491 struct vm_area_struct *area) 3492 { 3493 struct snd_pcm_runtime *runtime = substream->runtime; 3494 3495 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3496 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3497 } 3498 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3499 #endif /* SNDRV_PCM_INFO_MMAP */ 3500 3501 /* 3502 * mmap DMA buffer 3503 */ 3504 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3505 struct vm_area_struct *area) 3506 { 3507 struct snd_pcm_runtime *runtime; 3508 long size; 3509 unsigned long offset; 3510 size_t dma_bytes; 3511 int err; 3512 3513 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3514 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3515 return -EINVAL; 3516 } else { 3517 if (!(area->vm_flags & VM_READ)) 3518 return -EINVAL; 3519 } 3520 runtime = substream->runtime; 3521 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3522 return -EBADFD; 3523 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3524 return -ENXIO; 3525 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3526 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3527 return -EINVAL; 3528 size = area->vm_end - area->vm_start; 3529 offset = area->vm_pgoff << PAGE_SHIFT; 3530 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3531 if ((size_t)size > dma_bytes) 3532 return -EINVAL; 3533 if (offset > dma_bytes - size) 3534 return -EINVAL; 3535 3536 area->vm_ops = &snd_pcm_vm_ops_data; 3537 area->vm_private_data = substream; 3538 if (substream->ops->mmap) 3539 err = substream->ops->mmap(substream, area); 3540 else 3541 err = snd_pcm_lib_default_mmap(substream, area); 3542 if (!err) 3543 atomic_inc(&substream->mmap_count); 3544 return err; 3545 } 3546 EXPORT_SYMBOL(snd_pcm_mmap_data); 3547 3548 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3549 { 3550 struct snd_pcm_file * pcm_file; 3551 struct snd_pcm_substream *substream; 3552 unsigned long offset; 3553 3554 pcm_file = file->private_data; 3555 substream = pcm_file->substream; 3556 if (PCM_RUNTIME_CHECK(substream)) 3557 return -ENXIO; 3558 3559 offset = area->vm_pgoff << PAGE_SHIFT; 3560 switch (offset) { 3561 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3562 if (!pcm_status_mmap_allowed(pcm_file)) 3563 return -ENXIO; 3564 return snd_pcm_mmap_status(substream, file, area); 3565 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3566 if (!pcm_control_mmap_allowed(pcm_file)) 3567 return -ENXIO; 3568 return snd_pcm_mmap_control(substream, file, area); 3569 default: 3570 return snd_pcm_mmap_data(substream, file, area); 3571 } 3572 return 0; 3573 } 3574 3575 static int snd_pcm_fasync(int fd, struct file * file, int on) 3576 { 3577 struct snd_pcm_file * pcm_file; 3578 struct snd_pcm_substream *substream; 3579 struct snd_pcm_runtime *runtime; 3580 3581 pcm_file = file->private_data; 3582 substream = pcm_file->substream; 3583 if (PCM_RUNTIME_CHECK(substream)) 3584 return -ENXIO; 3585 runtime = substream->runtime; 3586 return fasync_helper(fd, file, on, &runtime->fasync); 3587 } 3588 3589 /* 3590 * ioctl32 compat 3591 */ 3592 #ifdef CONFIG_COMPAT 3593 #include "pcm_compat.c" 3594 #else 3595 #define snd_pcm_ioctl_compat NULL 3596 #endif 3597 3598 /* 3599 * To be removed helpers to keep binary compatibility 3600 */ 3601 3602 #ifdef CONFIG_SND_SUPPORT_OLD_API 3603 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3604 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3605 3606 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3607 struct snd_pcm_hw_params_old *oparams) 3608 { 3609 unsigned int i; 3610 3611 memset(params, 0, sizeof(*params)); 3612 params->flags = oparams->flags; 3613 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3614 params->masks[i].bits[0] = oparams->masks[i]; 3615 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3616 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3617 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3618 params->info = oparams->info; 3619 params->msbits = oparams->msbits; 3620 params->rate_num = oparams->rate_num; 3621 params->rate_den = oparams->rate_den; 3622 params->fifo_size = oparams->fifo_size; 3623 } 3624 3625 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3626 struct snd_pcm_hw_params *params) 3627 { 3628 unsigned int i; 3629 3630 memset(oparams, 0, sizeof(*oparams)); 3631 oparams->flags = params->flags; 3632 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3633 oparams->masks[i] = params->masks[i].bits[0]; 3634 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3635 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3636 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3637 oparams->info = params->info; 3638 oparams->msbits = params->msbits; 3639 oparams->rate_num = params->rate_num; 3640 oparams->rate_den = params->rate_den; 3641 oparams->fifo_size = params->fifo_size; 3642 } 3643 3644 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3645 struct snd_pcm_hw_params_old __user * _oparams) 3646 { 3647 struct snd_pcm_hw_params *params; 3648 struct snd_pcm_hw_params_old *oparams = NULL; 3649 int err; 3650 3651 params = kmalloc(sizeof(*params), GFP_KERNEL); 3652 if (!params) 3653 return -ENOMEM; 3654 3655 oparams = memdup_user(_oparams, sizeof(*oparams)); 3656 if (IS_ERR(oparams)) { 3657 err = PTR_ERR(oparams); 3658 goto out; 3659 } 3660 snd_pcm_hw_convert_from_old_params(params, oparams); 3661 err = snd_pcm_hw_refine(substream, params); 3662 if (err < 0) 3663 goto out_old; 3664 3665 err = fixup_unreferenced_params(substream, params); 3666 if (err < 0) 3667 goto out_old; 3668 3669 snd_pcm_hw_convert_to_old_params(oparams, params); 3670 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3671 err = -EFAULT; 3672 out_old: 3673 kfree(oparams); 3674 out: 3675 kfree(params); 3676 return err; 3677 } 3678 3679 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3680 struct snd_pcm_hw_params_old __user * _oparams) 3681 { 3682 struct snd_pcm_hw_params *params; 3683 struct snd_pcm_hw_params_old *oparams = NULL; 3684 int err; 3685 3686 params = kmalloc(sizeof(*params), GFP_KERNEL); 3687 if (!params) 3688 return -ENOMEM; 3689 3690 oparams = memdup_user(_oparams, sizeof(*oparams)); 3691 if (IS_ERR(oparams)) { 3692 err = PTR_ERR(oparams); 3693 goto out; 3694 } 3695 3696 snd_pcm_hw_convert_from_old_params(params, oparams); 3697 err = snd_pcm_hw_params(substream, params); 3698 if (err < 0) 3699 goto out_old; 3700 3701 snd_pcm_hw_convert_to_old_params(oparams, params); 3702 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3703 err = -EFAULT; 3704 out_old: 3705 kfree(oparams); 3706 out: 3707 kfree(params); 3708 return err; 3709 } 3710 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3711 3712 #ifndef CONFIG_MMU 3713 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3714 unsigned long addr, 3715 unsigned long len, 3716 unsigned long pgoff, 3717 unsigned long flags) 3718 { 3719 struct snd_pcm_file *pcm_file = file->private_data; 3720 struct snd_pcm_substream *substream = pcm_file->substream; 3721 struct snd_pcm_runtime *runtime = substream->runtime; 3722 unsigned long offset = pgoff << PAGE_SHIFT; 3723 3724 switch (offset) { 3725 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3726 return (unsigned long)runtime->status; 3727 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3728 return (unsigned long)runtime->control; 3729 default: 3730 return (unsigned long)runtime->dma_area + offset; 3731 } 3732 } 3733 #else 3734 # define snd_pcm_get_unmapped_area NULL 3735 #endif 3736 3737 /* 3738 * Register section 3739 */ 3740 3741 const struct file_operations snd_pcm_f_ops[2] = { 3742 { 3743 .owner = THIS_MODULE, 3744 .write = snd_pcm_write, 3745 .write_iter = snd_pcm_writev, 3746 .open = snd_pcm_playback_open, 3747 .release = snd_pcm_release, 3748 .llseek = no_llseek, 3749 .poll = snd_pcm_poll, 3750 .unlocked_ioctl = snd_pcm_ioctl, 3751 .compat_ioctl = snd_pcm_ioctl_compat, 3752 .mmap = snd_pcm_mmap, 3753 .fasync = snd_pcm_fasync, 3754 .get_unmapped_area = snd_pcm_get_unmapped_area, 3755 }, 3756 { 3757 .owner = THIS_MODULE, 3758 .read = snd_pcm_read, 3759 .read_iter = snd_pcm_readv, 3760 .open = snd_pcm_capture_open, 3761 .release = snd_pcm_release, 3762 .llseek = no_llseek, 3763 .poll = snd_pcm_poll, 3764 .unlocked_ioctl = snd_pcm_ioctl, 3765 .compat_ioctl = snd_pcm_ioctl_compat, 3766 .mmap = snd_pcm_mmap, 3767 .fasync = snd_pcm_fasync, 3768 .get_unmapped_area = snd_pcm_get_unmapped_area, 3769 } 3770 }; 3771