1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Digital Audio (PCM) abstract layer 4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 5 */ 6 7 #include <linux/mm.h> 8 #include <linux/module.h> 9 #include <linux/file.h> 10 #include <linux/slab.h> 11 #include <linux/sched/signal.h> 12 #include <linux/time.h> 13 #include <linux/pm_qos.h> 14 #include <linux/io.h> 15 #include <linux/dma-mapping.h> 16 #include <sound/core.h> 17 #include <sound/control.h> 18 #include <sound/info.h> 19 #include <sound/pcm.h> 20 #include <sound/pcm_params.h> 21 #include <sound/timer.h> 22 #include <sound/minors.h> 23 #include <linux/uio.h> 24 #include <linux/delay.h> 25 26 #include "pcm_local.h" 27 28 #ifdef CONFIG_SND_DEBUG 29 #define CREATE_TRACE_POINTS 30 #include "pcm_param_trace.h" 31 #else 32 #define trace_hw_mask_param_enabled() 0 33 #define trace_hw_interval_param_enabled() 0 34 #define trace_hw_mask_param(substream, type, index, prev, curr) 35 #define trace_hw_interval_param(substream, type, index, prev, curr) 36 #endif 37 38 /* 39 * Compatibility 40 */ 41 42 struct snd_pcm_hw_params_old { 43 unsigned int flags; 44 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 45 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 46 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 47 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 48 unsigned int rmask; 49 unsigned int cmask; 50 unsigned int info; 51 unsigned int msbits; 52 unsigned int rate_num; 53 unsigned int rate_den; 54 snd_pcm_uframes_t fifo_size; 55 unsigned char reserved[64]; 56 }; 57 58 #ifdef CONFIG_SND_SUPPORT_OLD_API 59 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 60 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 61 62 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 63 struct snd_pcm_hw_params_old __user * _oparams); 64 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 65 struct snd_pcm_hw_params_old __user * _oparams); 66 #endif 67 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 68 69 /* 70 * 71 */ 72 73 static DECLARE_RWSEM(snd_pcm_link_rwsem); 74 75 void snd_pcm_group_init(struct snd_pcm_group *group) 76 { 77 spin_lock_init(&group->lock); 78 mutex_init(&group->mutex); 79 INIT_LIST_HEAD(&group->substreams); 80 refcount_set(&group->refs, 1); 81 } 82 83 /* define group lock helpers */ 84 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \ 85 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \ 86 { \ 87 if (nonatomic) \ 88 mutex_ ## mutex_action(&group->mutex); \ 89 else \ 90 spin_ ## action(&group->lock); \ 91 } 92 93 DEFINE_PCM_GROUP_LOCK(lock, lock); 94 DEFINE_PCM_GROUP_LOCK(unlock, unlock); 95 DEFINE_PCM_GROUP_LOCK(lock_irq, lock); 96 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock); 97 98 /** 99 * snd_pcm_stream_lock - Lock the PCM stream 100 * @substream: PCM substream 101 * 102 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 103 * flag of the given substream. This also takes the global link rw lock 104 * (or rw sem), too, for avoiding the race with linked streams. 105 */ 106 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 107 { 108 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic); 109 } 110 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 111 112 /** 113 * snd_pcm_stream_lock - Unlock the PCM stream 114 * @substream: PCM substream 115 * 116 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 117 */ 118 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 119 { 120 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic); 121 } 122 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 123 124 /** 125 * snd_pcm_stream_lock_irq - Lock the PCM stream 126 * @substream: PCM substream 127 * 128 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 129 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 130 * as snd_pcm_stream_lock(). 131 */ 132 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 133 { 134 snd_pcm_group_lock_irq(&substream->self_group, 135 substream->pcm->nonatomic); 136 } 137 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 138 139 /** 140 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 141 * @substream: PCM substream 142 * 143 * This is a counter-part of snd_pcm_stream_lock_irq(). 144 */ 145 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 146 { 147 snd_pcm_group_unlock_irq(&substream->self_group, 148 substream->pcm->nonatomic); 149 } 150 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 151 152 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 153 { 154 unsigned long flags = 0; 155 if (substream->pcm->nonatomic) 156 mutex_lock(&substream->self_group.mutex); 157 else 158 spin_lock_irqsave(&substream->self_group.lock, flags); 159 return flags; 160 } 161 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 162 163 /** 164 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 165 * @substream: PCM substream 166 * @flags: irq flags 167 * 168 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 169 */ 170 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 171 unsigned long flags) 172 { 173 if (substream->pcm->nonatomic) 174 mutex_unlock(&substream->self_group.mutex); 175 else 176 spin_unlock_irqrestore(&substream->self_group.lock, flags); 177 } 178 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 179 180 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 181 { 182 struct snd_pcm *pcm = substream->pcm; 183 struct snd_pcm_str *pstr = substream->pstr; 184 185 memset(info, 0, sizeof(*info)); 186 info->card = pcm->card->number; 187 info->device = pcm->device; 188 info->stream = substream->stream; 189 info->subdevice = substream->number; 190 strlcpy(info->id, pcm->id, sizeof(info->id)); 191 strlcpy(info->name, pcm->name, sizeof(info->name)); 192 info->dev_class = pcm->dev_class; 193 info->dev_subclass = pcm->dev_subclass; 194 info->subdevices_count = pstr->substream_count; 195 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 196 strlcpy(info->subname, substream->name, sizeof(info->subname)); 197 198 return 0; 199 } 200 201 int snd_pcm_info_user(struct snd_pcm_substream *substream, 202 struct snd_pcm_info __user * _info) 203 { 204 struct snd_pcm_info *info; 205 int err; 206 207 info = kmalloc(sizeof(*info), GFP_KERNEL); 208 if (! info) 209 return -ENOMEM; 210 err = snd_pcm_info(substream, info); 211 if (err >= 0) { 212 if (copy_to_user(_info, info, sizeof(*info))) 213 err = -EFAULT; 214 } 215 kfree(info); 216 return err; 217 } 218 219 static bool hw_support_mmap(struct snd_pcm_substream *substream) 220 { 221 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 222 return false; 223 224 if (substream->ops->mmap || 225 substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV) 226 return true; 227 228 return dma_can_mmap(substream->dma_buffer.dev.dev); 229 } 230 231 static int constrain_mask_params(struct snd_pcm_substream *substream, 232 struct snd_pcm_hw_params *params) 233 { 234 struct snd_pcm_hw_constraints *constrs = 235 &substream->runtime->hw_constraints; 236 struct snd_mask *m; 237 unsigned int k; 238 struct snd_mask old_mask; 239 int changed; 240 241 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 242 m = hw_param_mask(params, k); 243 if (snd_mask_empty(m)) 244 return -EINVAL; 245 246 /* This parameter is not requested to change by a caller. */ 247 if (!(params->rmask & (1 << k))) 248 continue; 249 250 if (trace_hw_mask_param_enabled()) 251 old_mask = *m; 252 253 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 254 if (changed < 0) 255 return changed; 256 if (changed == 0) 257 continue; 258 259 /* Set corresponding flag so that the caller gets it. */ 260 trace_hw_mask_param(substream, k, 0, &old_mask, m); 261 params->cmask |= 1 << k; 262 } 263 264 return 0; 265 } 266 267 static int constrain_interval_params(struct snd_pcm_substream *substream, 268 struct snd_pcm_hw_params *params) 269 { 270 struct snd_pcm_hw_constraints *constrs = 271 &substream->runtime->hw_constraints; 272 struct snd_interval *i; 273 unsigned int k; 274 struct snd_interval old_interval; 275 int changed; 276 277 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 278 i = hw_param_interval(params, k); 279 if (snd_interval_empty(i)) 280 return -EINVAL; 281 282 /* This parameter is not requested to change by a caller. */ 283 if (!(params->rmask & (1 << k))) 284 continue; 285 286 if (trace_hw_interval_param_enabled()) 287 old_interval = *i; 288 289 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 290 if (changed < 0) 291 return changed; 292 if (changed == 0) 293 continue; 294 295 /* Set corresponding flag so that the caller gets it. */ 296 trace_hw_interval_param(substream, k, 0, &old_interval, i); 297 params->cmask |= 1 << k; 298 } 299 300 return 0; 301 } 302 303 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 304 struct snd_pcm_hw_params *params) 305 { 306 struct snd_pcm_hw_constraints *constrs = 307 &substream->runtime->hw_constraints; 308 unsigned int k; 309 unsigned int *rstamps; 310 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 311 unsigned int stamp; 312 struct snd_pcm_hw_rule *r; 313 unsigned int d; 314 struct snd_mask old_mask; 315 struct snd_interval old_interval; 316 bool again; 317 int changed, err = 0; 318 319 /* 320 * Each application of rule has own sequence number. 321 * 322 * Each member of 'rstamps' array represents the sequence number of 323 * recent application of corresponding rule. 324 */ 325 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 326 if (!rstamps) 327 return -ENOMEM; 328 329 /* 330 * Each member of 'vstamps' array represents the sequence number of 331 * recent application of rule in which corresponding parameters were 332 * changed. 333 * 334 * In initial state, elements corresponding to parameters requested by 335 * a caller is 1. For unrequested parameters, corresponding members 336 * have 0 so that the parameters are never changed anymore. 337 */ 338 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 339 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 340 341 /* Due to the above design, actual sequence number starts at 2. */ 342 stamp = 2; 343 retry: 344 /* Apply all rules in order. */ 345 again = false; 346 for (k = 0; k < constrs->rules_num; k++) { 347 r = &constrs->rules[k]; 348 349 /* 350 * Check condition bits of this rule. When the rule has 351 * some condition bits, parameter without the bits is 352 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 353 * is an example of the condition bits. 354 */ 355 if (r->cond && !(r->cond & params->flags)) 356 continue; 357 358 /* 359 * The 'deps' array includes maximum three dependencies 360 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 361 * member of this array is a sentinel and should be 362 * negative value. 363 * 364 * This rule should be processed in this time when dependent 365 * parameters were changed at former applications of the other 366 * rules. 367 */ 368 for (d = 0; r->deps[d] >= 0; d++) { 369 if (vstamps[r->deps[d]] > rstamps[k]) 370 break; 371 } 372 if (r->deps[d] < 0) 373 continue; 374 375 if (trace_hw_mask_param_enabled()) { 376 if (hw_is_mask(r->var)) 377 old_mask = *hw_param_mask(params, r->var); 378 } 379 if (trace_hw_interval_param_enabled()) { 380 if (hw_is_interval(r->var)) 381 old_interval = *hw_param_interval(params, r->var); 382 } 383 384 changed = r->func(params, r); 385 if (changed < 0) { 386 err = changed; 387 goto out; 388 } 389 390 /* 391 * When the parameter is changed, notify it to the caller 392 * by corresponding returned bit, then preparing for next 393 * iteration. 394 */ 395 if (changed && r->var >= 0) { 396 if (hw_is_mask(r->var)) { 397 trace_hw_mask_param(substream, r->var, 398 k + 1, &old_mask, 399 hw_param_mask(params, r->var)); 400 } 401 if (hw_is_interval(r->var)) { 402 trace_hw_interval_param(substream, r->var, 403 k + 1, &old_interval, 404 hw_param_interval(params, r->var)); 405 } 406 407 params->cmask |= (1 << r->var); 408 vstamps[r->var] = stamp; 409 again = true; 410 } 411 412 rstamps[k] = stamp++; 413 } 414 415 /* Iterate to evaluate all rules till no parameters are changed. */ 416 if (again) 417 goto retry; 418 419 out: 420 kfree(rstamps); 421 return err; 422 } 423 424 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 425 struct snd_pcm_hw_params *params) 426 { 427 const struct snd_interval *i; 428 const struct snd_mask *m; 429 int err; 430 431 if (!params->msbits) { 432 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 433 if (snd_interval_single(i)) 434 params->msbits = snd_interval_value(i); 435 } 436 437 if (!params->rate_den) { 438 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 439 if (snd_interval_single(i)) { 440 params->rate_num = snd_interval_value(i); 441 params->rate_den = 1; 442 } 443 } 444 445 if (!params->fifo_size) { 446 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 447 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 448 if (snd_mask_single(m) && snd_interval_single(i)) { 449 err = substream->ops->ioctl(substream, 450 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 451 if (err < 0) 452 return err; 453 } 454 } 455 456 if (!params->info) { 457 params->info = substream->runtime->hw.info; 458 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 459 SNDRV_PCM_INFO_DRAIN_TRIGGER); 460 if (!hw_support_mmap(substream)) 461 params->info &= ~(SNDRV_PCM_INFO_MMAP | 462 SNDRV_PCM_INFO_MMAP_VALID); 463 } 464 465 return 0; 466 } 467 468 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 469 struct snd_pcm_hw_params *params) 470 { 471 int err; 472 473 params->info = 0; 474 params->fifo_size = 0; 475 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 476 params->msbits = 0; 477 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 478 params->rate_num = 0; 479 params->rate_den = 0; 480 } 481 482 err = constrain_mask_params(substream, params); 483 if (err < 0) 484 return err; 485 486 err = constrain_interval_params(substream, params); 487 if (err < 0) 488 return err; 489 490 err = constrain_params_by_rules(substream, params); 491 if (err < 0) 492 return err; 493 494 params->rmask = 0; 495 496 return 0; 497 } 498 EXPORT_SYMBOL(snd_pcm_hw_refine); 499 500 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 501 struct snd_pcm_hw_params __user * _params) 502 { 503 struct snd_pcm_hw_params *params; 504 int err; 505 506 params = memdup_user(_params, sizeof(*params)); 507 if (IS_ERR(params)) 508 return PTR_ERR(params); 509 510 err = snd_pcm_hw_refine(substream, params); 511 if (err < 0) 512 goto end; 513 514 err = fixup_unreferenced_params(substream, params); 515 if (err < 0) 516 goto end; 517 518 if (copy_to_user(_params, params, sizeof(*params))) 519 err = -EFAULT; 520 end: 521 kfree(params); 522 return err; 523 } 524 525 static int period_to_usecs(struct snd_pcm_runtime *runtime) 526 { 527 int usecs; 528 529 if (! runtime->rate) 530 return -1; /* invalid */ 531 532 /* take 75% of period time as the deadline */ 533 usecs = (750000 / runtime->rate) * runtime->period_size; 534 usecs += ((750000 % runtime->rate) * runtime->period_size) / 535 runtime->rate; 536 537 return usecs; 538 } 539 540 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 541 { 542 snd_pcm_stream_lock_irq(substream); 543 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 544 substream->runtime->status->state = state; 545 snd_pcm_stream_unlock_irq(substream); 546 } 547 548 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 549 int event) 550 { 551 #ifdef CONFIG_SND_PCM_TIMER 552 if (substream->timer) 553 snd_timer_notify(substream->timer, event, 554 &substream->runtime->trigger_tstamp); 555 #endif 556 } 557 558 /** 559 * snd_pcm_hw_param_choose - choose a configuration defined by @params 560 * @pcm: PCM instance 561 * @params: the hw_params instance 562 * 563 * Choose one configuration from configuration space defined by @params. 564 * The configuration chosen is that obtained fixing in this order: 565 * first access, first format, first subformat, min channels, 566 * min rate, min period time, max buffer size, min tick time 567 * 568 * Return: Zero if successful, or a negative error code on failure. 569 */ 570 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 571 struct snd_pcm_hw_params *params) 572 { 573 static const int vars[] = { 574 SNDRV_PCM_HW_PARAM_ACCESS, 575 SNDRV_PCM_HW_PARAM_FORMAT, 576 SNDRV_PCM_HW_PARAM_SUBFORMAT, 577 SNDRV_PCM_HW_PARAM_CHANNELS, 578 SNDRV_PCM_HW_PARAM_RATE, 579 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 580 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 581 SNDRV_PCM_HW_PARAM_TICK_TIME, 582 -1 583 }; 584 const int *v; 585 struct snd_mask old_mask; 586 struct snd_interval old_interval; 587 int changed; 588 589 for (v = vars; *v != -1; v++) { 590 /* Keep old parameter to trace. */ 591 if (trace_hw_mask_param_enabled()) { 592 if (hw_is_mask(*v)) 593 old_mask = *hw_param_mask(params, *v); 594 } 595 if (trace_hw_interval_param_enabled()) { 596 if (hw_is_interval(*v)) 597 old_interval = *hw_param_interval(params, *v); 598 } 599 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 600 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 601 else 602 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 603 if (changed < 0) 604 return changed; 605 if (changed == 0) 606 continue; 607 608 /* Trace the changed parameter. */ 609 if (hw_is_mask(*v)) { 610 trace_hw_mask_param(pcm, *v, 0, &old_mask, 611 hw_param_mask(params, *v)); 612 } 613 if (hw_is_interval(*v)) { 614 trace_hw_interval_param(pcm, *v, 0, &old_interval, 615 hw_param_interval(params, *v)); 616 } 617 } 618 619 return 0; 620 } 621 622 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 623 struct snd_pcm_hw_params *params) 624 { 625 struct snd_pcm_runtime *runtime; 626 int err, usecs; 627 unsigned int bits; 628 snd_pcm_uframes_t frames; 629 630 if (PCM_RUNTIME_CHECK(substream)) 631 return -ENXIO; 632 runtime = substream->runtime; 633 snd_pcm_stream_lock_irq(substream); 634 switch (runtime->status->state) { 635 case SNDRV_PCM_STATE_OPEN: 636 case SNDRV_PCM_STATE_SETUP: 637 case SNDRV_PCM_STATE_PREPARED: 638 break; 639 default: 640 snd_pcm_stream_unlock_irq(substream); 641 return -EBADFD; 642 } 643 snd_pcm_stream_unlock_irq(substream); 644 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 645 if (!substream->oss.oss) 646 #endif 647 if (atomic_read(&substream->mmap_count)) 648 return -EBADFD; 649 650 params->rmask = ~0U; 651 err = snd_pcm_hw_refine(substream, params); 652 if (err < 0) 653 goto _error; 654 655 err = snd_pcm_hw_params_choose(substream, params); 656 if (err < 0) 657 goto _error; 658 659 err = fixup_unreferenced_params(substream, params); 660 if (err < 0) 661 goto _error; 662 663 if (substream->ops->hw_params != NULL) { 664 err = substream->ops->hw_params(substream, params); 665 if (err < 0) 666 goto _error; 667 } 668 669 runtime->access = params_access(params); 670 runtime->format = params_format(params); 671 runtime->subformat = params_subformat(params); 672 runtime->channels = params_channels(params); 673 runtime->rate = params_rate(params); 674 runtime->period_size = params_period_size(params); 675 runtime->periods = params_periods(params); 676 runtime->buffer_size = params_buffer_size(params); 677 runtime->info = params->info; 678 runtime->rate_num = params->rate_num; 679 runtime->rate_den = params->rate_den; 680 runtime->no_period_wakeup = 681 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 682 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 683 684 bits = snd_pcm_format_physical_width(runtime->format); 685 runtime->sample_bits = bits; 686 bits *= runtime->channels; 687 runtime->frame_bits = bits; 688 frames = 1; 689 while (bits % 8 != 0) { 690 bits *= 2; 691 frames *= 2; 692 } 693 runtime->byte_align = bits / 8; 694 runtime->min_align = frames; 695 696 /* Default sw params */ 697 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 698 runtime->period_step = 1; 699 runtime->control->avail_min = runtime->period_size; 700 runtime->start_threshold = 1; 701 runtime->stop_threshold = runtime->buffer_size; 702 runtime->silence_threshold = 0; 703 runtime->silence_size = 0; 704 runtime->boundary = runtime->buffer_size; 705 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 706 runtime->boundary *= 2; 707 708 snd_pcm_timer_resolution_change(substream); 709 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 710 711 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 712 pm_qos_remove_request(&substream->latency_pm_qos_req); 713 if ((usecs = period_to_usecs(runtime)) >= 0) 714 pm_qos_add_request(&substream->latency_pm_qos_req, 715 PM_QOS_CPU_DMA_LATENCY, usecs); 716 return 0; 717 _error: 718 /* hardware might be unusable from this time, 719 so we force application to retry to set 720 the correct hardware parameter settings */ 721 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 722 if (substream->ops->hw_free != NULL) 723 substream->ops->hw_free(substream); 724 return err; 725 } 726 727 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 728 struct snd_pcm_hw_params __user * _params) 729 { 730 struct snd_pcm_hw_params *params; 731 int err; 732 733 params = memdup_user(_params, sizeof(*params)); 734 if (IS_ERR(params)) 735 return PTR_ERR(params); 736 737 err = snd_pcm_hw_params(substream, params); 738 if (err < 0) 739 goto end; 740 741 if (copy_to_user(_params, params, sizeof(*params))) 742 err = -EFAULT; 743 end: 744 kfree(params); 745 return err; 746 } 747 748 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 749 { 750 struct snd_pcm_runtime *runtime; 751 int result = 0; 752 753 if (PCM_RUNTIME_CHECK(substream)) 754 return -ENXIO; 755 runtime = substream->runtime; 756 snd_pcm_stream_lock_irq(substream); 757 switch (runtime->status->state) { 758 case SNDRV_PCM_STATE_SETUP: 759 case SNDRV_PCM_STATE_PREPARED: 760 break; 761 default: 762 snd_pcm_stream_unlock_irq(substream); 763 return -EBADFD; 764 } 765 snd_pcm_stream_unlock_irq(substream); 766 if (atomic_read(&substream->mmap_count)) 767 return -EBADFD; 768 if (substream->ops->hw_free) 769 result = substream->ops->hw_free(substream); 770 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 771 pm_qos_remove_request(&substream->latency_pm_qos_req); 772 return result; 773 } 774 775 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 776 struct snd_pcm_sw_params *params) 777 { 778 struct snd_pcm_runtime *runtime; 779 int err; 780 781 if (PCM_RUNTIME_CHECK(substream)) 782 return -ENXIO; 783 runtime = substream->runtime; 784 snd_pcm_stream_lock_irq(substream); 785 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 786 snd_pcm_stream_unlock_irq(substream); 787 return -EBADFD; 788 } 789 snd_pcm_stream_unlock_irq(substream); 790 791 if (params->tstamp_mode < 0 || 792 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 793 return -EINVAL; 794 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 795 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 796 return -EINVAL; 797 if (params->avail_min == 0) 798 return -EINVAL; 799 if (params->silence_size >= runtime->boundary) { 800 if (params->silence_threshold != 0) 801 return -EINVAL; 802 } else { 803 if (params->silence_size > params->silence_threshold) 804 return -EINVAL; 805 if (params->silence_threshold > runtime->buffer_size) 806 return -EINVAL; 807 } 808 err = 0; 809 snd_pcm_stream_lock_irq(substream); 810 runtime->tstamp_mode = params->tstamp_mode; 811 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 812 runtime->tstamp_type = params->tstamp_type; 813 runtime->period_step = params->period_step; 814 runtime->control->avail_min = params->avail_min; 815 runtime->start_threshold = params->start_threshold; 816 runtime->stop_threshold = params->stop_threshold; 817 runtime->silence_threshold = params->silence_threshold; 818 runtime->silence_size = params->silence_size; 819 params->boundary = runtime->boundary; 820 if (snd_pcm_running(substream)) { 821 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 822 runtime->silence_size > 0) 823 snd_pcm_playback_silence(substream, ULONG_MAX); 824 err = snd_pcm_update_state(substream, runtime); 825 } 826 snd_pcm_stream_unlock_irq(substream); 827 return err; 828 } 829 830 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 831 struct snd_pcm_sw_params __user * _params) 832 { 833 struct snd_pcm_sw_params params; 834 int err; 835 if (copy_from_user(¶ms, _params, sizeof(params))) 836 return -EFAULT; 837 err = snd_pcm_sw_params(substream, ¶ms); 838 if (copy_to_user(_params, ¶ms, sizeof(params))) 839 return -EFAULT; 840 return err; 841 } 842 843 static inline snd_pcm_uframes_t 844 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 845 { 846 snd_pcm_uframes_t delay; 847 848 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 849 delay = snd_pcm_playback_hw_avail(substream->runtime); 850 else 851 delay = snd_pcm_capture_avail(substream->runtime); 852 return delay + substream->runtime->delay; 853 } 854 855 int snd_pcm_status(struct snd_pcm_substream *substream, 856 struct snd_pcm_status *status) 857 { 858 struct snd_pcm_runtime *runtime = substream->runtime; 859 860 snd_pcm_stream_lock_irq(substream); 861 862 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 863 &runtime->audio_tstamp_config); 864 865 /* backwards compatible behavior */ 866 if (runtime->audio_tstamp_config.type_requested == 867 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 868 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 869 runtime->audio_tstamp_config.type_requested = 870 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 871 else 872 runtime->audio_tstamp_config.type_requested = 873 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 874 runtime->audio_tstamp_report.valid = 0; 875 } else 876 runtime->audio_tstamp_report.valid = 1; 877 878 status->state = runtime->status->state; 879 status->suspended_state = runtime->status->suspended_state; 880 if (status->state == SNDRV_PCM_STATE_OPEN) 881 goto _end; 882 status->trigger_tstamp = runtime->trigger_tstamp; 883 if (snd_pcm_running(substream)) { 884 snd_pcm_update_hw_ptr(substream); 885 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 886 status->tstamp = runtime->status->tstamp; 887 status->driver_tstamp = runtime->driver_tstamp; 888 status->audio_tstamp = 889 runtime->status->audio_tstamp; 890 if (runtime->audio_tstamp_report.valid == 1) 891 /* backwards compatibility, no report provided in COMPAT mode */ 892 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 893 &status->audio_tstamp_accuracy, 894 &runtime->audio_tstamp_report); 895 896 goto _tstamp_end; 897 } 898 } else { 899 /* get tstamp only in fallback mode and only if enabled */ 900 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 901 snd_pcm_gettime(runtime, &status->tstamp); 902 } 903 _tstamp_end: 904 status->appl_ptr = runtime->control->appl_ptr; 905 status->hw_ptr = runtime->status->hw_ptr; 906 status->avail = snd_pcm_avail(substream); 907 status->delay = snd_pcm_running(substream) ? 908 snd_pcm_calc_delay(substream) : 0; 909 status->avail_max = runtime->avail_max; 910 status->overrange = runtime->overrange; 911 runtime->avail_max = 0; 912 runtime->overrange = 0; 913 _end: 914 snd_pcm_stream_unlock_irq(substream); 915 return 0; 916 } 917 918 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 919 struct snd_pcm_status __user * _status, 920 bool ext) 921 { 922 struct snd_pcm_status status; 923 int res; 924 925 memset(&status, 0, sizeof(status)); 926 /* 927 * with extension, parameters are read/write, 928 * get audio_tstamp_data from user, 929 * ignore rest of status structure 930 */ 931 if (ext && get_user(status.audio_tstamp_data, 932 (u32 __user *)(&_status->audio_tstamp_data))) 933 return -EFAULT; 934 res = snd_pcm_status(substream, &status); 935 if (res < 0) 936 return res; 937 if (copy_to_user(_status, &status, sizeof(status))) 938 return -EFAULT; 939 return 0; 940 } 941 942 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 943 struct snd_pcm_channel_info * info) 944 { 945 struct snd_pcm_runtime *runtime; 946 unsigned int channel; 947 948 channel = info->channel; 949 runtime = substream->runtime; 950 snd_pcm_stream_lock_irq(substream); 951 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 952 snd_pcm_stream_unlock_irq(substream); 953 return -EBADFD; 954 } 955 snd_pcm_stream_unlock_irq(substream); 956 if (channel >= runtime->channels) 957 return -EINVAL; 958 memset(info, 0, sizeof(*info)); 959 info->channel = channel; 960 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 961 } 962 963 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 964 struct snd_pcm_channel_info __user * _info) 965 { 966 struct snd_pcm_channel_info info; 967 int res; 968 969 if (copy_from_user(&info, _info, sizeof(info))) 970 return -EFAULT; 971 res = snd_pcm_channel_info(substream, &info); 972 if (res < 0) 973 return res; 974 if (copy_to_user(_info, &info, sizeof(info))) 975 return -EFAULT; 976 return 0; 977 } 978 979 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 980 { 981 struct snd_pcm_runtime *runtime = substream->runtime; 982 if (runtime->trigger_master == NULL) 983 return; 984 if (runtime->trigger_master == substream) { 985 if (!runtime->trigger_tstamp_latched) 986 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 987 } else { 988 snd_pcm_trigger_tstamp(runtime->trigger_master); 989 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 990 } 991 runtime->trigger_master = NULL; 992 } 993 994 struct action_ops { 995 int (*pre_action)(struct snd_pcm_substream *substream, int state); 996 int (*do_action)(struct snd_pcm_substream *substream, int state); 997 void (*undo_action)(struct snd_pcm_substream *substream, int state); 998 void (*post_action)(struct snd_pcm_substream *substream, int state); 999 }; 1000 1001 /* 1002 * this functions is core for handling of linked stream 1003 * Note: the stream state might be changed also on failure 1004 * Note2: call with calling stream lock + link lock 1005 */ 1006 static int snd_pcm_action_group(const struct action_ops *ops, 1007 struct snd_pcm_substream *substream, 1008 int state, int do_lock) 1009 { 1010 struct snd_pcm_substream *s = NULL; 1011 struct snd_pcm_substream *s1; 1012 int res = 0, depth = 1; 1013 1014 snd_pcm_group_for_each_entry(s, substream) { 1015 if (do_lock && s != substream) { 1016 if (s->pcm->nonatomic) 1017 mutex_lock_nested(&s->self_group.mutex, depth); 1018 else 1019 spin_lock_nested(&s->self_group.lock, depth); 1020 depth++; 1021 } 1022 res = ops->pre_action(s, state); 1023 if (res < 0) 1024 goto _unlock; 1025 } 1026 snd_pcm_group_for_each_entry(s, substream) { 1027 res = ops->do_action(s, state); 1028 if (res < 0) { 1029 if (ops->undo_action) { 1030 snd_pcm_group_for_each_entry(s1, substream) { 1031 if (s1 == s) /* failed stream */ 1032 break; 1033 ops->undo_action(s1, state); 1034 } 1035 } 1036 s = NULL; /* unlock all */ 1037 goto _unlock; 1038 } 1039 } 1040 snd_pcm_group_for_each_entry(s, substream) { 1041 ops->post_action(s, state); 1042 } 1043 _unlock: 1044 if (do_lock) { 1045 /* unlock streams */ 1046 snd_pcm_group_for_each_entry(s1, substream) { 1047 if (s1 != substream) { 1048 if (s1->pcm->nonatomic) 1049 mutex_unlock(&s1->self_group.mutex); 1050 else 1051 spin_unlock(&s1->self_group.lock); 1052 } 1053 if (s1 == s) /* end */ 1054 break; 1055 } 1056 } 1057 return res; 1058 } 1059 1060 /* 1061 * Note: call with stream lock 1062 */ 1063 static int snd_pcm_action_single(const struct action_ops *ops, 1064 struct snd_pcm_substream *substream, 1065 int state) 1066 { 1067 int res; 1068 1069 res = ops->pre_action(substream, state); 1070 if (res < 0) 1071 return res; 1072 res = ops->do_action(substream, state); 1073 if (res == 0) 1074 ops->post_action(substream, state); 1075 else if (ops->undo_action) 1076 ops->undo_action(substream, state); 1077 return res; 1078 } 1079 1080 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1081 struct snd_pcm_group *new_group) 1082 { 1083 substream->group = new_group; 1084 list_move(&substream->link_list, &new_group->substreams); 1085 } 1086 1087 /* 1088 * Unref and unlock the group, but keep the stream lock; 1089 * when the group becomes empty and no longer referred, destroy itself 1090 */ 1091 static void snd_pcm_group_unref(struct snd_pcm_group *group, 1092 struct snd_pcm_substream *substream) 1093 { 1094 bool do_free; 1095 1096 if (!group) 1097 return; 1098 do_free = refcount_dec_and_test(&group->refs); 1099 snd_pcm_group_unlock(group, substream->pcm->nonatomic); 1100 if (do_free) 1101 kfree(group); 1102 } 1103 1104 /* 1105 * Lock the group inside a stream lock and reference it; 1106 * return the locked group object, or NULL if not linked 1107 */ 1108 static struct snd_pcm_group * 1109 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) 1110 { 1111 bool nonatomic = substream->pcm->nonatomic; 1112 struct snd_pcm_group *group; 1113 bool trylock; 1114 1115 for (;;) { 1116 if (!snd_pcm_stream_linked(substream)) 1117 return NULL; 1118 group = substream->group; 1119 /* block freeing the group object */ 1120 refcount_inc(&group->refs); 1121 1122 trylock = nonatomic ? mutex_trylock(&group->mutex) : 1123 spin_trylock(&group->lock); 1124 if (trylock) 1125 break; /* OK */ 1126 1127 /* re-lock for avoiding ABBA deadlock */ 1128 snd_pcm_stream_unlock(substream); 1129 snd_pcm_group_lock(group, nonatomic); 1130 snd_pcm_stream_lock(substream); 1131 1132 /* check the group again; the above opens a small race window */ 1133 if (substream->group == group) 1134 break; /* OK */ 1135 /* group changed, try again */ 1136 snd_pcm_group_unref(group, substream); 1137 } 1138 return group; 1139 } 1140 1141 /* 1142 * Note: call with stream lock 1143 */ 1144 static int snd_pcm_action(const struct action_ops *ops, 1145 struct snd_pcm_substream *substream, 1146 int state) 1147 { 1148 struct snd_pcm_group *group; 1149 int res; 1150 1151 group = snd_pcm_stream_group_ref(substream); 1152 if (group) 1153 res = snd_pcm_action_group(ops, substream, state, 1); 1154 else 1155 res = snd_pcm_action_single(ops, substream, state); 1156 snd_pcm_group_unref(group, substream); 1157 return res; 1158 } 1159 1160 /* 1161 * Note: don't use any locks before 1162 */ 1163 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1164 struct snd_pcm_substream *substream, 1165 int state) 1166 { 1167 int res; 1168 1169 snd_pcm_stream_lock_irq(substream); 1170 res = snd_pcm_action(ops, substream, state); 1171 snd_pcm_stream_unlock_irq(substream); 1172 return res; 1173 } 1174 1175 /* 1176 */ 1177 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1178 struct snd_pcm_substream *substream, 1179 int state) 1180 { 1181 int res; 1182 1183 /* Guarantee the group members won't change during non-atomic action */ 1184 down_read(&snd_pcm_link_rwsem); 1185 if (snd_pcm_stream_linked(substream)) 1186 res = snd_pcm_action_group(ops, substream, state, 0); 1187 else 1188 res = snd_pcm_action_single(ops, substream, state); 1189 up_read(&snd_pcm_link_rwsem); 1190 return res; 1191 } 1192 1193 /* 1194 * start callbacks 1195 */ 1196 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1197 { 1198 struct snd_pcm_runtime *runtime = substream->runtime; 1199 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1200 return -EBADFD; 1201 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1202 !snd_pcm_playback_data(substream)) 1203 return -EPIPE; 1204 runtime->trigger_tstamp_latched = false; 1205 runtime->trigger_master = substream; 1206 return 0; 1207 } 1208 1209 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1210 { 1211 if (substream->runtime->trigger_master != substream) 1212 return 0; 1213 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1214 } 1215 1216 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1217 { 1218 if (substream->runtime->trigger_master == substream) 1219 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1220 } 1221 1222 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1223 { 1224 struct snd_pcm_runtime *runtime = substream->runtime; 1225 snd_pcm_trigger_tstamp(substream); 1226 runtime->hw_ptr_jiffies = jiffies; 1227 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1228 runtime->rate; 1229 runtime->status->state = state; 1230 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1231 runtime->silence_size > 0) 1232 snd_pcm_playback_silence(substream, ULONG_MAX); 1233 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1234 } 1235 1236 static const struct action_ops snd_pcm_action_start = { 1237 .pre_action = snd_pcm_pre_start, 1238 .do_action = snd_pcm_do_start, 1239 .undo_action = snd_pcm_undo_start, 1240 .post_action = snd_pcm_post_start 1241 }; 1242 1243 /** 1244 * snd_pcm_start - start all linked streams 1245 * @substream: the PCM substream instance 1246 * 1247 * Return: Zero if successful, or a negative error code. 1248 * The stream lock must be acquired before calling this function. 1249 */ 1250 int snd_pcm_start(struct snd_pcm_substream *substream) 1251 { 1252 return snd_pcm_action(&snd_pcm_action_start, substream, 1253 SNDRV_PCM_STATE_RUNNING); 1254 } 1255 1256 /* take the stream lock and start the streams */ 1257 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1258 { 1259 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1260 SNDRV_PCM_STATE_RUNNING); 1261 } 1262 1263 /* 1264 * stop callbacks 1265 */ 1266 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1267 { 1268 struct snd_pcm_runtime *runtime = substream->runtime; 1269 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1270 return -EBADFD; 1271 runtime->trigger_master = substream; 1272 return 0; 1273 } 1274 1275 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1276 { 1277 if (substream->runtime->trigger_master == substream && 1278 snd_pcm_running(substream)) 1279 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1280 return 0; /* unconditonally stop all substreams */ 1281 } 1282 1283 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1284 { 1285 struct snd_pcm_runtime *runtime = substream->runtime; 1286 if (runtime->status->state != state) { 1287 snd_pcm_trigger_tstamp(substream); 1288 runtime->status->state = state; 1289 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1290 } 1291 wake_up(&runtime->sleep); 1292 wake_up(&runtime->tsleep); 1293 } 1294 1295 static const struct action_ops snd_pcm_action_stop = { 1296 .pre_action = snd_pcm_pre_stop, 1297 .do_action = snd_pcm_do_stop, 1298 .post_action = snd_pcm_post_stop 1299 }; 1300 1301 /** 1302 * snd_pcm_stop - try to stop all running streams in the substream group 1303 * @substream: the PCM substream instance 1304 * @state: PCM state after stopping the stream 1305 * 1306 * The state of each stream is then changed to the given state unconditionally. 1307 * 1308 * Return: Zero if successful, or a negative error code. 1309 */ 1310 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1311 { 1312 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1313 } 1314 EXPORT_SYMBOL(snd_pcm_stop); 1315 1316 /** 1317 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1318 * @substream: the PCM substream 1319 * 1320 * After stopping, the state is changed to SETUP. 1321 * Unlike snd_pcm_stop(), this affects only the given stream. 1322 * 1323 * Return: Zero if succesful, or a negative error code. 1324 */ 1325 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1326 { 1327 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1328 SNDRV_PCM_STATE_SETUP); 1329 } 1330 1331 /** 1332 * snd_pcm_stop_xrun - stop the running streams as XRUN 1333 * @substream: the PCM substream instance 1334 * 1335 * This stops the given running substream (and all linked substreams) as XRUN. 1336 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1337 * 1338 * Return: Zero if successful, or a negative error code. 1339 */ 1340 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1341 { 1342 unsigned long flags; 1343 1344 snd_pcm_stream_lock_irqsave(substream, flags); 1345 if (substream->runtime && snd_pcm_running(substream)) 1346 __snd_pcm_xrun(substream); 1347 snd_pcm_stream_unlock_irqrestore(substream, flags); 1348 return 0; 1349 } 1350 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1351 1352 /* 1353 * pause callbacks 1354 */ 1355 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1356 { 1357 struct snd_pcm_runtime *runtime = substream->runtime; 1358 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1359 return -ENOSYS; 1360 if (push) { 1361 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1362 return -EBADFD; 1363 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1364 return -EBADFD; 1365 runtime->trigger_master = substream; 1366 return 0; 1367 } 1368 1369 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1370 { 1371 if (substream->runtime->trigger_master != substream) 1372 return 0; 1373 /* some drivers might use hw_ptr to recover from the pause - 1374 update the hw_ptr now */ 1375 if (push) 1376 snd_pcm_update_hw_ptr(substream); 1377 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1378 * a delta between the current jiffies, this gives a large enough 1379 * delta, effectively to skip the check once. 1380 */ 1381 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1382 return substream->ops->trigger(substream, 1383 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1384 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1385 } 1386 1387 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1388 { 1389 if (substream->runtime->trigger_master == substream) 1390 substream->ops->trigger(substream, 1391 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1392 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1393 } 1394 1395 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1396 { 1397 struct snd_pcm_runtime *runtime = substream->runtime; 1398 snd_pcm_trigger_tstamp(substream); 1399 if (push) { 1400 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1401 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1402 wake_up(&runtime->sleep); 1403 wake_up(&runtime->tsleep); 1404 } else { 1405 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1406 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1407 } 1408 } 1409 1410 static const struct action_ops snd_pcm_action_pause = { 1411 .pre_action = snd_pcm_pre_pause, 1412 .do_action = snd_pcm_do_pause, 1413 .undo_action = snd_pcm_undo_pause, 1414 .post_action = snd_pcm_post_pause 1415 }; 1416 1417 /* 1418 * Push/release the pause for all linked streams. 1419 */ 1420 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1421 { 1422 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1423 } 1424 1425 #ifdef CONFIG_PM 1426 /* suspend */ 1427 1428 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1429 { 1430 struct snd_pcm_runtime *runtime = substream->runtime; 1431 switch (runtime->status->state) { 1432 case SNDRV_PCM_STATE_SUSPENDED: 1433 return -EBUSY; 1434 /* unresumable PCM state; return -EBUSY for skipping suspend */ 1435 case SNDRV_PCM_STATE_OPEN: 1436 case SNDRV_PCM_STATE_SETUP: 1437 case SNDRV_PCM_STATE_DISCONNECTED: 1438 return -EBUSY; 1439 } 1440 runtime->trigger_master = substream; 1441 return 0; 1442 } 1443 1444 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1445 { 1446 struct snd_pcm_runtime *runtime = substream->runtime; 1447 if (runtime->trigger_master != substream) 1448 return 0; 1449 if (! snd_pcm_running(substream)) 1450 return 0; 1451 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1452 return 0; /* suspend unconditionally */ 1453 } 1454 1455 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1456 { 1457 struct snd_pcm_runtime *runtime = substream->runtime; 1458 snd_pcm_trigger_tstamp(substream); 1459 runtime->status->suspended_state = runtime->status->state; 1460 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1461 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1462 wake_up(&runtime->sleep); 1463 wake_up(&runtime->tsleep); 1464 } 1465 1466 static const struct action_ops snd_pcm_action_suspend = { 1467 .pre_action = snd_pcm_pre_suspend, 1468 .do_action = snd_pcm_do_suspend, 1469 .post_action = snd_pcm_post_suspend 1470 }; 1471 1472 /* 1473 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1474 * @substream: the PCM substream 1475 * 1476 * After this call, all streams are changed to SUSPENDED state. 1477 * 1478 * Return: Zero if successful, or a negative error code. 1479 */ 1480 static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1481 { 1482 int err; 1483 unsigned long flags; 1484 1485 snd_pcm_stream_lock_irqsave(substream, flags); 1486 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1487 snd_pcm_stream_unlock_irqrestore(substream, flags); 1488 return err; 1489 } 1490 1491 /** 1492 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1493 * @pcm: the PCM instance 1494 * 1495 * After this call, all streams are changed to SUSPENDED state. 1496 * 1497 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1498 */ 1499 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1500 { 1501 struct snd_pcm_substream *substream; 1502 int stream, err = 0; 1503 1504 if (! pcm) 1505 return 0; 1506 1507 for (stream = 0; stream < 2; stream++) { 1508 for (substream = pcm->streams[stream].substream; 1509 substream; substream = substream->next) { 1510 /* FIXME: the open/close code should lock this as well */ 1511 if (substream->runtime == NULL) 1512 continue; 1513 1514 /* 1515 * Skip BE dai link PCM's that are internal and may 1516 * not have their substream ops set. 1517 */ 1518 if (!substream->ops) 1519 continue; 1520 1521 err = snd_pcm_suspend(substream); 1522 if (err < 0 && err != -EBUSY) 1523 return err; 1524 } 1525 } 1526 return 0; 1527 } 1528 EXPORT_SYMBOL(snd_pcm_suspend_all); 1529 1530 /* resume */ 1531 1532 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1533 { 1534 struct snd_pcm_runtime *runtime = substream->runtime; 1535 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1536 return -ENOSYS; 1537 runtime->trigger_master = substream; 1538 return 0; 1539 } 1540 1541 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1542 { 1543 struct snd_pcm_runtime *runtime = substream->runtime; 1544 if (runtime->trigger_master != substream) 1545 return 0; 1546 /* DMA not running previously? */ 1547 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1548 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1549 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1550 return 0; 1551 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1552 } 1553 1554 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1555 { 1556 if (substream->runtime->trigger_master == substream && 1557 snd_pcm_running(substream)) 1558 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1559 } 1560 1561 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1562 { 1563 struct snd_pcm_runtime *runtime = substream->runtime; 1564 snd_pcm_trigger_tstamp(substream); 1565 runtime->status->state = runtime->status->suspended_state; 1566 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1567 } 1568 1569 static const struct action_ops snd_pcm_action_resume = { 1570 .pre_action = snd_pcm_pre_resume, 1571 .do_action = snd_pcm_do_resume, 1572 .undo_action = snd_pcm_undo_resume, 1573 .post_action = snd_pcm_post_resume 1574 }; 1575 1576 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1577 { 1578 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1579 } 1580 1581 #else 1582 1583 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1584 { 1585 return -ENOSYS; 1586 } 1587 1588 #endif /* CONFIG_PM */ 1589 1590 /* 1591 * xrun ioctl 1592 * 1593 * Change the RUNNING stream(s) to XRUN state. 1594 */ 1595 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1596 { 1597 struct snd_pcm_runtime *runtime = substream->runtime; 1598 int result; 1599 1600 snd_pcm_stream_lock_irq(substream); 1601 switch (runtime->status->state) { 1602 case SNDRV_PCM_STATE_XRUN: 1603 result = 0; /* already there */ 1604 break; 1605 case SNDRV_PCM_STATE_RUNNING: 1606 __snd_pcm_xrun(substream); 1607 result = 0; 1608 break; 1609 default: 1610 result = -EBADFD; 1611 } 1612 snd_pcm_stream_unlock_irq(substream); 1613 return result; 1614 } 1615 1616 /* 1617 * reset ioctl 1618 */ 1619 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1620 { 1621 struct snd_pcm_runtime *runtime = substream->runtime; 1622 switch (runtime->status->state) { 1623 case SNDRV_PCM_STATE_RUNNING: 1624 case SNDRV_PCM_STATE_PREPARED: 1625 case SNDRV_PCM_STATE_PAUSED: 1626 case SNDRV_PCM_STATE_SUSPENDED: 1627 return 0; 1628 default: 1629 return -EBADFD; 1630 } 1631 } 1632 1633 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1634 { 1635 struct snd_pcm_runtime *runtime = substream->runtime; 1636 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1637 if (err < 0) 1638 return err; 1639 runtime->hw_ptr_base = 0; 1640 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1641 runtime->status->hw_ptr % runtime->period_size; 1642 runtime->silence_start = runtime->status->hw_ptr; 1643 runtime->silence_filled = 0; 1644 return 0; 1645 } 1646 1647 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1648 { 1649 struct snd_pcm_runtime *runtime = substream->runtime; 1650 runtime->control->appl_ptr = runtime->status->hw_ptr; 1651 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1652 runtime->silence_size > 0) 1653 snd_pcm_playback_silence(substream, ULONG_MAX); 1654 } 1655 1656 static const struct action_ops snd_pcm_action_reset = { 1657 .pre_action = snd_pcm_pre_reset, 1658 .do_action = snd_pcm_do_reset, 1659 .post_action = snd_pcm_post_reset 1660 }; 1661 1662 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1663 { 1664 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1665 } 1666 1667 /* 1668 * prepare ioctl 1669 */ 1670 /* we use the second argument for updating f_flags */ 1671 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1672 int f_flags) 1673 { 1674 struct snd_pcm_runtime *runtime = substream->runtime; 1675 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1676 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1677 return -EBADFD; 1678 if (snd_pcm_running(substream)) 1679 return -EBUSY; 1680 substream->f_flags = f_flags; 1681 return 0; 1682 } 1683 1684 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1685 { 1686 int err; 1687 err = substream->ops->prepare(substream); 1688 if (err < 0) 1689 return err; 1690 return snd_pcm_do_reset(substream, 0); 1691 } 1692 1693 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1694 { 1695 struct snd_pcm_runtime *runtime = substream->runtime; 1696 runtime->control->appl_ptr = runtime->status->hw_ptr; 1697 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1698 } 1699 1700 static const struct action_ops snd_pcm_action_prepare = { 1701 .pre_action = snd_pcm_pre_prepare, 1702 .do_action = snd_pcm_do_prepare, 1703 .post_action = snd_pcm_post_prepare 1704 }; 1705 1706 /** 1707 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1708 * @substream: the PCM substream instance 1709 * @file: file to refer f_flags 1710 * 1711 * Return: Zero if successful, or a negative error code. 1712 */ 1713 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1714 struct file *file) 1715 { 1716 int f_flags; 1717 1718 if (file) 1719 f_flags = file->f_flags; 1720 else 1721 f_flags = substream->f_flags; 1722 1723 snd_pcm_stream_lock_irq(substream); 1724 switch (substream->runtime->status->state) { 1725 case SNDRV_PCM_STATE_PAUSED: 1726 snd_pcm_pause(substream, 0); 1727 /* fallthru */ 1728 case SNDRV_PCM_STATE_SUSPENDED: 1729 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1730 break; 1731 } 1732 snd_pcm_stream_unlock_irq(substream); 1733 1734 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1735 substream, f_flags); 1736 } 1737 1738 /* 1739 * drain ioctl 1740 */ 1741 1742 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1743 { 1744 struct snd_pcm_runtime *runtime = substream->runtime; 1745 switch (runtime->status->state) { 1746 case SNDRV_PCM_STATE_OPEN: 1747 case SNDRV_PCM_STATE_DISCONNECTED: 1748 case SNDRV_PCM_STATE_SUSPENDED: 1749 return -EBADFD; 1750 } 1751 runtime->trigger_master = substream; 1752 return 0; 1753 } 1754 1755 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1756 { 1757 struct snd_pcm_runtime *runtime = substream->runtime; 1758 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1759 switch (runtime->status->state) { 1760 case SNDRV_PCM_STATE_PREPARED: 1761 /* start playback stream if possible */ 1762 if (! snd_pcm_playback_empty(substream)) { 1763 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1764 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1765 } else { 1766 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1767 } 1768 break; 1769 case SNDRV_PCM_STATE_RUNNING: 1770 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1771 break; 1772 case SNDRV_PCM_STATE_XRUN: 1773 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1774 break; 1775 default: 1776 break; 1777 } 1778 } else { 1779 /* stop running stream */ 1780 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1781 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1782 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1783 snd_pcm_do_stop(substream, new_state); 1784 snd_pcm_post_stop(substream, new_state); 1785 } 1786 } 1787 1788 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1789 runtime->trigger_master == substream && 1790 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1791 return substream->ops->trigger(substream, 1792 SNDRV_PCM_TRIGGER_DRAIN); 1793 1794 return 0; 1795 } 1796 1797 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1798 { 1799 } 1800 1801 static const struct action_ops snd_pcm_action_drain_init = { 1802 .pre_action = snd_pcm_pre_drain_init, 1803 .do_action = snd_pcm_do_drain_init, 1804 .post_action = snd_pcm_post_drain_init 1805 }; 1806 1807 /* 1808 * Drain the stream(s). 1809 * When the substream is linked, sync until the draining of all playback streams 1810 * is finished. 1811 * After this call, all streams are supposed to be either SETUP or DRAINING 1812 * (capture only) state. 1813 */ 1814 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1815 struct file *file) 1816 { 1817 struct snd_card *card; 1818 struct snd_pcm_runtime *runtime; 1819 struct snd_pcm_substream *s; 1820 struct snd_pcm_group *group; 1821 wait_queue_entry_t wait; 1822 int result = 0; 1823 int nonblock = 0; 1824 1825 card = substream->pcm->card; 1826 runtime = substream->runtime; 1827 1828 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1829 return -EBADFD; 1830 1831 if (file) { 1832 if (file->f_flags & O_NONBLOCK) 1833 nonblock = 1; 1834 } else if (substream->f_flags & O_NONBLOCK) 1835 nonblock = 1; 1836 1837 snd_pcm_stream_lock_irq(substream); 1838 /* resume pause */ 1839 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1840 snd_pcm_pause(substream, 0); 1841 1842 /* pre-start/stop - all running streams are changed to DRAINING state */ 1843 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1844 if (result < 0) 1845 goto unlock; 1846 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1847 if (nonblock) { 1848 result = -EAGAIN; 1849 goto unlock; 1850 } 1851 1852 for (;;) { 1853 long tout; 1854 struct snd_pcm_runtime *to_check; 1855 if (signal_pending(current)) { 1856 result = -ERESTARTSYS; 1857 break; 1858 } 1859 /* find a substream to drain */ 1860 to_check = NULL; 1861 group = snd_pcm_stream_group_ref(substream); 1862 snd_pcm_group_for_each_entry(s, substream) { 1863 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1864 continue; 1865 runtime = s->runtime; 1866 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1867 to_check = runtime; 1868 break; 1869 } 1870 } 1871 snd_pcm_group_unref(group, substream); 1872 if (!to_check) 1873 break; /* all drained */ 1874 init_waitqueue_entry(&wait, current); 1875 set_current_state(TASK_INTERRUPTIBLE); 1876 add_wait_queue(&to_check->sleep, &wait); 1877 snd_pcm_stream_unlock_irq(substream); 1878 if (runtime->no_period_wakeup) 1879 tout = MAX_SCHEDULE_TIMEOUT; 1880 else { 1881 tout = 10; 1882 if (runtime->rate) { 1883 long t = runtime->period_size * 2 / runtime->rate; 1884 tout = max(t, tout); 1885 } 1886 tout = msecs_to_jiffies(tout * 1000); 1887 } 1888 tout = schedule_timeout(tout); 1889 1890 snd_pcm_stream_lock_irq(substream); 1891 group = snd_pcm_stream_group_ref(substream); 1892 snd_pcm_group_for_each_entry(s, substream) { 1893 if (s->runtime == to_check) { 1894 remove_wait_queue(&to_check->sleep, &wait); 1895 break; 1896 } 1897 } 1898 snd_pcm_group_unref(group, substream); 1899 1900 if (card->shutdown) { 1901 result = -ENODEV; 1902 break; 1903 } 1904 if (tout == 0) { 1905 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1906 result = -ESTRPIPE; 1907 else { 1908 dev_dbg(substream->pcm->card->dev, 1909 "playback drain error (DMA or IRQ trouble?)\n"); 1910 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1911 result = -EIO; 1912 } 1913 break; 1914 } 1915 } 1916 1917 unlock: 1918 snd_pcm_stream_unlock_irq(substream); 1919 1920 return result; 1921 } 1922 1923 /* 1924 * drop ioctl 1925 * 1926 * Immediately put all linked substreams into SETUP state. 1927 */ 1928 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1929 { 1930 struct snd_pcm_runtime *runtime; 1931 int result = 0; 1932 1933 if (PCM_RUNTIME_CHECK(substream)) 1934 return -ENXIO; 1935 runtime = substream->runtime; 1936 1937 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1938 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1939 return -EBADFD; 1940 1941 snd_pcm_stream_lock_irq(substream); 1942 /* resume pause */ 1943 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1944 snd_pcm_pause(substream, 0); 1945 1946 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1947 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1948 snd_pcm_stream_unlock_irq(substream); 1949 1950 return result; 1951 } 1952 1953 1954 static bool is_pcm_file(struct file *file) 1955 { 1956 struct inode *inode = file_inode(file); 1957 struct snd_pcm *pcm; 1958 unsigned int minor; 1959 1960 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1961 return false; 1962 minor = iminor(inode); 1963 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 1964 if (!pcm) 1965 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1966 if (!pcm) 1967 return false; 1968 snd_card_unref(pcm->card); 1969 return true; 1970 } 1971 1972 /* 1973 * PCM link handling 1974 */ 1975 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1976 { 1977 int res = 0; 1978 struct snd_pcm_file *pcm_file; 1979 struct snd_pcm_substream *substream1; 1980 struct snd_pcm_group *group, *target_group; 1981 bool nonatomic = substream->pcm->nonatomic; 1982 struct fd f = fdget(fd); 1983 1984 if (!f.file) 1985 return -EBADFD; 1986 if (!is_pcm_file(f.file)) { 1987 res = -EBADFD; 1988 goto _badf; 1989 } 1990 pcm_file = f.file->private_data; 1991 substream1 = pcm_file->substream; 1992 group = kzalloc(sizeof(*group), GFP_KERNEL); 1993 if (!group) { 1994 res = -ENOMEM; 1995 goto _nolock; 1996 } 1997 snd_pcm_group_init(group); 1998 1999 down_write(&snd_pcm_link_rwsem); 2000 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 2001 substream->runtime->status->state != substream1->runtime->status->state || 2002 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2003 res = -EBADFD; 2004 goto _end; 2005 } 2006 if (snd_pcm_stream_linked(substream1)) { 2007 res = -EALREADY; 2008 goto _end; 2009 } 2010 2011 snd_pcm_stream_lock_irq(substream); 2012 if (!snd_pcm_stream_linked(substream)) { 2013 snd_pcm_group_assign(substream, group); 2014 group = NULL; /* assigned, don't free this one below */ 2015 } 2016 target_group = substream->group; 2017 snd_pcm_stream_unlock_irq(substream); 2018 2019 snd_pcm_group_lock_irq(target_group, nonatomic); 2020 snd_pcm_stream_lock(substream1); 2021 snd_pcm_group_assign(substream1, target_group); 2022 refcount_inc(&target_group->refs); 2023 snd_pcm_stream_unlock(substream1); 2024 snd_pcm_group_unlock_irq(target_group, nonatomic); 2025 _end: 2026 up_write(&snd_pcm_link_rwsem); 2027 _nolock: 2028 kfree(group); 2029 _badf: 2030 fdput(f); 2031 return res; 2032 } 2033 2034 static void relink_to_local(struct snd_pcm_substream *substream) 2035 { 2036 snd_pcm_stream_lock(substream); 2037 snd_pcm_group_assign(substream, &substream->self_group); 2038 snd_pcm_stream_unlock(substream); 2039 } 2040 2041 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2042 { 2043 struct snd_pcm_group *group; 2044 bool nonatomic = substream->pcm->nonatomic; 2045 bool do_free = false; 2046 int res = 0; 2047 2048 down_write(&snd_pcm_link_rwsem); 2049 2050 if (!snd_pcm_stream_linked(substream)) { 2051 res = -EALREADY; 2052 goto _end; 2053 } 2054 2055 group = substream->group; 2056 snd_pcm_group_lock_irq(group, nonatomic); 2057 2058 relink_to_local(substream); 2059 refcount_dec(&group->refs); 2060 2061 /* detach the last stream, too */ 2062 if (list_is_singular(&group->substreams)) { 2063 relink_to_local(list_first_entry(&group->substreams, 2064 struct snd_pcm_substream, 2065 link_list)); 2066 do_free = refcount_dec_and_test(&group->refs); 2067 } 2068 2069 snd_pcm_group_unlock_irq(group, nonatomic); 2070 if (do_free) 2071 kfree(group); 2072 2073 _end: 2074 up_write(&snd_pcm_link_rwsem); 2075 return res; 2076 } 2077 2078 /* 2079 * hw configurator 2080 */ 2081 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2082 struct snd_pcm_hw_rule *rule) 2083 { 2084 struct snd_interval t; 2085 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2086 hw_param_interval_c(params, rule->deps[1]), &t); 2087 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2088 } 2089 2090 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2091 struct snd_pcm_hw_rule *rule) 2092 { 2093 struct snd_interval t; 2094 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2095 hw_param_interval_c(params, rule->deps[1]), &t); 2096 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2097 } 2098 2099 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2100 struct snd_pcm_hw_rule *rule) 2101 { 2102 struct snd_interval t; 2103 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2104 hw_param_interval_c(params, rule->deps[1]), 2105 (unsigned long) rule->private, &t); 2106 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2107 } 2108 2109 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2110 struct snd_pcm_hw_rule *rule) 2111 { 2112 struct snd_interval t; 2113 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2114 (unsigned long) rule->private, 2115 hw_param_interval_c(params, rule->deps[1]), &t); 2116 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2117 } 2118 2119 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2120 struct snd_pcm_hw_rule *rule) 2121 { 2122 unsigned int k; 2123 const struct snd_interval *i = 2124 hw_param_interval_c(params, rule->deps[0]); 2125 struct snd_mask m; 2126 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2127 snd_mask_any(&m); 2128 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2129 int bits; 2130 if (! snd_mask_test(mask, k)) 2131 continue; 2132 bits = snd_pcm_format_physical_width(k); 2133 if (bits <= 0) 2134 continue; /* ignore invalid formats */ 2135 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2136 snd_mask_reset(&m, k); 2137 } 2138 return snd_mask_refine(mask, &m); 2139 } 2140 2141 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2142 struct snd_pcm_hw_rule *rule) 2143 { 2144 struct snd_interval t; 2145 unsigned int k; 2146 t.min = UINT_MAX; 2147 t.max = 0; 2148 t.openmin = 0; 2149 t.openmax = 0; 2150 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2151 int bits; 2152 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2153 continue; 2154 bits = snd_pcm_format_physical_width(k); 2155 if (bits <= 0) 2156 continue; /* ignore invalid formats */ 2157 if (t.min > (unsigned)bits) 2158 t.min = bits; 2159 if (t.max < (unsigned)bits) 2160 t.max = bits; 2161 } 2162 t.integer = 1; 2163 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2164 } 2165 2166 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2167 #error "Change this table" 2168 #endif 2169 2170 static const unsigned int rates[] = { 2171 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2172 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000 2173 }; 2174 2175 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2176 .count = ARRAY_SIZE(rates), 2177 .list = rates, 2178 }; 2179 2180 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2181 struct snd_pcm_hw_rule *rule) 2182 { 2183 struct snd_pcm_hardware *hw = rule->private; 2184 return snd_interval_list(hw_param_interval(params, rule->var), 2185 snd_pcm_known_rates.count, 2186 snd_pcm_known_rates.list, hw->rates); 2187 } 2188 2189 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2190 struct snd_pcm_hw_rule *rule) 2191 { 2192 struct snd_interval t; 2193 struct snd_pcm_substream *substream = rule->private; 2194 t.min = 0; 2195 t.max = substream->buffer_bytes_max; 2196 t.openmin = 0; 2197 t.openmax = 0; 2198 t.integer = 1; 2199 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2200 } 2201 2202 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2203 { 2204 struct snd_pcm_runtime *runtime = substream->runtime; 2205 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2206 int k, err; 2207 2208 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2209 snd_mask_any(constrs_mask(constrs, k)); 2210 } 2211 2212 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2213 snd_interval_any(constrs_interval(constrs, k)); 2214 } 2215 2216 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2217 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2218 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2219 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2220 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2221 2222 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2223 snd_pcm_hw_rule_format, NULL, 2224 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2225 if (err < 0) 2226 return err; 2227 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2228 snd_pcm_hw_rule_sample_bits, NULL, 2229 SNDRV_PCM_HW_PARAM_FORMAT, 2230 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2231 if (err < 0) 2232 return err; 2233 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2234 snd_pcm_hw_rule_div, NULL, 2235 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2236 if (err < 0) 2237 return err; 2238 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2239 snd_pcm_hw_rule_mul, NULL, 2240 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2241 if (err < 0) 2242 return err; 2243 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2244 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2245 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2246 if (err < 0) 2247 return err; 2248 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2249 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2250 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2251 if (err < 0) 2252 return err; 2253 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2254 snd_pcm_hw_rule_div, NULL, 2255 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2256 if (err < 0) 2257 return err; 2258 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2259 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2260 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2261 if (err < 0) 2262 return err; 2263 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2264 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2265 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2266 if (err < 0) 2267 return err; 2268 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2269 snd_pcm_hw_rule_div, NULL, 2270 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2271 if (err < 0) 2272 return err; 2273 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2274 snd_pcm_hw_rule_div, NULL, 2275 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2276 if (err < 0) 2277 return err; 2278 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2279 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2280 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2281 if (err < 0) 2282 return err; 2283 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2284 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2285 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2286 if (err < 0) 2287 return err; 2288 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2289 snd_pcm_hw_rule_mul, NULL, 2290 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2291 if (err < 0) 2292 return err; 2293 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2294 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2295 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2296 if (err < 0) 2297 return err; 2298 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2299 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2300 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2301 if (err < 0) 2302 return err; 2303 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2304 snd_pcm_hw_rule_muldivk, (void*) 8, 2305 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2306 if (err < 0) 2307 return err; 2308 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2309 snd_pcm_hw_rule_muldivk, (void*) 8, 2310 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2311 if (err < 0) 2312 return err; 2313 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2314 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2315 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2316 if (err < 0) 2317 return err; 2318 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2319 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2320 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2321 if (err < 0) 2322 return err; 2323 return 0; 2324 } 2325 2326 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2327 { 2328 struct snd_pcm_runtime *runtime = substream->runtime; 2329 struct snd_pcm_hardware *hw = &runtime->hw; 2330 int err; 2331 unsigned int mask = 0; 2332 2333 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2334 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2335 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2336 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2337 if (hw_support_mmap(substream)) { 2338 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2339 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2340 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2341 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2342 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2343 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2344 } 2345 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2346 if (err < 0) 2347 return err; 2348 2349 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2350 if (err < 0) 2351 return err; 2352 2353 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2354 if (err < 0) 2355 return err; 2356 2357 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2358 hw->channels_min, hw->channels_max); 2359 if (err < 0) 2360 return err; 2361 2362 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2363 hw->rate_min, hw->rate_max); 2364 if (err < 0) 2365 return err; 2366 2367 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2368 hw->period_bytes_min, hw->period_bytes_max); 2369 if (err < 0) 2370 return err; 2371 2372 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2373 hw->periods_min, hw->periods_max); 2374 if (err < 0) 2375 return err; 2376 2377 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2378 hw->period_bytes_min, hw->buffer_bytes_max); 2379 if (err < 0) 2380 return err; 2381 2382 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2383 snd_pcm_hw_rule_buffer_bytes_max, substream, 2384 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2385 if (err < 0) 2386 return err; 2387 2388 /* FIXME: remove */ 2389 if (runtime->dma_bytes) { 2390 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2391 if (err < 0) 2392 return err; 2393 } 2394 2395 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2396 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2397 snd_pcm_hw_rule_rate, hw, 2398 SNDRV_PCM_HW_PARAM_RATE, -1); 2399 if (err < 0) 2400 return err; 2401 } 2402 2403 /* FIXME: this belong to lowlevel */ 2404 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2405 2406 return 0; 2407 } 2408 2409 static void pcm_release_private(struct snd_pcm_substream *substream) 2410 { 2411 if (snd_pcm_stream_linked(substream)) 2412 snd_pcm_unlink(substream); 2413 } 2414 2415 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2416 { 2417 substream->ref_count--; 2418 if (substream->ref_count > 0) 2419 return; 2420 2421 snd_pcm_drop(substream); 2422 if (substream->hw_opened) { 2423 if (substream->ops->hw_free && 2424 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2425 substream->ops->hw_free(substream); 2426 substream->ops->close(substream); 2427 substream->hw_opened = 0; 2428 } 2429 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2430 pm_qos_remove_request(&substream->latency_pm_qos_req); 2431 if (substream->pcm_release) { 2432 substream->pcm_release(substream); 2433 substream->pcm_release = NULL; 2434 } 2435 snd_pcm_detach_substream(substream); 2436 } 2437 EXPORT_SYMBOL(snd_pcm_release_substream); 2438 2439 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2440 struct file *file, 2441 struct snd_pcm_substream **rsubstream) 2442 { 2443 struct snd_pcm_substream *substream; 2444 int err; 2445 2446 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2447 if (err < 0) 2448 return err; 2449 if (substream->ref_count > 1) { 2450 *rsubstream = substream; 2451 return 0; 2452 } 2453 2454 err = snd_pcm_hw_constraints_init(substream); 2455 if (err < 0) { 2456 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2457 goto error; 2458 } 2459 2460 if ((err = substream->ops->open(substream)) < 0) 2461 goto error; 2462 2463 substream->hw_opened = 1; 2464 2465 err = snd_pcm_hw_constraints_complete(substream); 2466 if (err < 0) { 2467 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2468 goto error; 2469 } 2470 2471 *rsubstream = substream; 2472 return 0; 2473 2474 error: 2475 snd_pcm_release_substream(substream); 2476 return err; 2477 } 2478 EXPORT_SYMBOL(snd_pcm_open_substream); 2479 2480 static int snd_pcm_open_file(struct file *file, 2481 struct snd_pcm *pcm, 2482 int stream) 2483 { 2484 struct snd_pcm_file *pcm_file; 2485 struct snd_pcm_substream *substream; 2486 int err; 2487 2488 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2489 if (err < 0) 2490 return err; 2491 2492 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2493 if (pcm_file == NULL) { 2494 snd_pcm_release_substream(substream); 2495 return -ENOMEM; 2496 } 2497 pcm_file->substream = substream; 2498 if (substream->ref_count == 1) 2499 substream->pcm_release = pcm_release_private; 2500 file->private_data = pcm_file; 2501 2502 return 0; 2503 } 2504 2505 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2506 { 2507 struct snd_pcm *pcm; 2508 int err = nonseekable_open(inode, file); 2509 if (err < 0) 2510 return err; 2511 pcm = snd_lookup_minor_data(iminor(inode), 2512 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2513 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2514 if (pcm) 2515 snd_card_unref(pcm->card); 2516 return err; 2517 } 2518 2519 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2520 { 2521 struct snd_pcm *pcm; 2522 int err = nonseekable_open(inode, file); 2523 if (err < 0) 2524 return err; 2525 pcm = snd_lookup_minor_data(iminor(inode), 2526 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2527 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2528 if (pcm) 2529 snd_card_unref(pcm->card); 2530 return err; 2531 } 2532 2533 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2534 { 2535 int err; 2536 wait_queue_entry_t wait; 2537 2538 if (pcm == NULL) { 2539 err = -ENODEV; 2540 goto __error1; 2541 } 2542 err = snd_card_file_add(pcm->card, file); 2543 if (err < 0) 2544 goto __error1; 2545 if (!try_module_get(pcm->card->module)) { 2546 err = -EFAULT; 2547 goto __error2; 2548 } 2549 init_waitqueue_entry(&wait, current); 2550 add_wait_queue(&pcm->open_wait, &wait); 2551 mutex_lock(&pcm->open_mutex); 2552 while (1) { 2553 err = snd_pcm_open_file(file, pcm, stream); 2554 if (err >= 0) 2555 break; 2556 if (err == -EAGAIN) { 2557 if (file->f_flags & O_NONBLOCK) { 2558 err = -EBUSY; 2559 break; 2560 } 2561 } else 2562 break; 2563 set_current_state(TASK_INTERRUPTIBLE); 2564 mutex_unlock(&pcm->open_mutex); 2565 schedule(); 2566 mutex_lock(&pcm->open_mutex); 2567 if (pcm->card->shutdown) { 2568 err = -ENODEV; 2569 break; 2570 } 2571 if (signal_pending(current)) { 2572 err = -ERESTARTSYS; 2573 break; 2574 } 2575 } 2576 remove_wait_queue(&pcm->open_wait, &wait); 2577 mutex_unlock(&pcm->open_mutex); 2578 if (err < 0) 2579 goto __error; 2580 return err; 2581 2582 __error: 2583 module_put(pcm->card->module); 2584 __error2: 2585 snd_card_file_remove(pcm->card, file); 2586 __error1: 2587 return err; 2588 } 2589 2590 static int snd_pcm_release(struct inode *inode, struct file *file) 2591 { 2592 struct snd_pcm *pcm; 2593 struct snd_pcm_substream *substream; 2594 struct snd_pcm_file *pcm_file; 2595 2596 pcm_file = file->private_data; 2597 substream = pcm_file->substream; 2598 if (snd_BUG_ON(!substream)) 2599 return -ENXIO; 2600 pcm = substream->pcm; 2601 mutex_lock(&pcm->open_mutex); 2602 snd_pcm_release_substream(substream); 2603 kfree(pcm_file); 2604 mutex_unlock(&pcm->open_mutex); 2605 wake_up(&pcm->open_wait); 2606 module_put(pcm->card->module); 2607 snd_card_file_remove(pcm->card, file); 2608 return 0; 2609 } 2610 2611 /* check and update PCM state; return 0 or a negative error 2612 * call this inside PCM lock 2613 */ 2614 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2615 { 2616 switch (substream->runtime->status->state) { 2617 case SNDRV_PCM_STATE_DRAINING: 2618 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2619 return -EBADFD; 2620 /* Fall through */ 2621 case SNDRV_PCM_STATE_RUNNING: 2622 return snd_pcm_update_hw_ptr(substream); 2623 case SNDRV_PCM_STATE_PREPARED: 2624 case SNDRV_PCM_STATE_PAUSED: 2625 return 0; 2626 case SNDRV_PCM_STATE_SUSPENDED: 2627 return -ESTRPIPE; 2628 case SNDRV_PCM_STATE_XRUN: 2629 return -EPIPE; 2630 default: 2631 return -EBADFD; 2632 } 2633 } 2634 2635 /* increase the appl_ptr; returns the processed frames or a negative error */ 2636 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2637 snd_pcm_uframes_t frames, 2638 snd_pcm_sframes_t avail) 2639 { 2640 struct snd_pcm_runtime *runtime = substream->runtime; 2641 snd_pcm_sframes_t appl_ptr; 2642 int ret; 2643 2644 if (avail <= 0) 2645 return 0; 2646 if (frames > (snd_pcm_uframes_t)avail) 2647 frames = avail; 2648 appl_ptr = runtime->control->appl_ptr + frames; 2649 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2650 appl_ptr -= runtime->boundary; 2651 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2652 return ret < 0 ? ret : frames; 2653 } 2654 2655 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2656 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2657 snd_pcm_uframes_t frames, 2658 snd_pcm_sframes_t avail) 2659 { 2660 struct snd_pcm_runtime *runtime = substream->runtime; 2661 snd_pcm_sframes_t appl_ptr; 2662 int ret; 2663 2664 if (avail <= 0) 2665 return 0; 2666 if (frames > (snd_pcm_uframes_t)avail) 2667 frames = avail; 2668 appl_ptr = runtime->control->appl_ptr - frames; 2669 if (appl_ptr < 0) 2670 appl_ptr += runtime->boundary; 2671 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2672 /* NOTE: we return zero for errors because PulseAudio gets depressed 2673 * upon receiving an error from rewind ioctl and stops processing 2674 * any longer. Returning zero means that no rewind is done, so 2675 * it's not absolutely wrong to answer like that. 2676 */ 2677 return ret < 0 ? 0 : frames; 2678 } 2679 2680 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2681 snd_pcm_uframes_t frames) 2682 { 2683 snd_pcm_sframes_t ret; 2684 2685 if (frames == 0) 2686 return 0; 2687 2688 snd_pcm_stream_lock_irq(substream); 2689 ret = do_pcm_hwsync(substream); 2690 if (!ret) 2691 ret = rewind_appl_ptr(substream, frames, 2692 snd_pcm_hw_avail(substream)); 2693 snd_pcm_stream_unlock_irq(substream); 2694 return ret; 2695 } 2696 2697 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2698 snd_pcm_uframes_t frames) 2699 { 2700 snd_pcm_sframes_t ret; 2701 2702 if (frames == 0) 2703 return 0; 2704 2705 snd_pcm_stream_lock_irq(substream); 2706 ret = do_pcm_hwsync(substream); 2707 if (!ret) 2708 ret = forward_appl_ptr(substream, frames, 2709 snd_pcm_avail(substream)); 2710 snd_pcm_stream_unlock_irq(substream); 2711 return ret; 2712 } 2713 2714 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2715 { 2716 int err; 2717 2718 snd_pcm_stream_lock_irq(substream); 2719 err = do_pcm_hwsync(substream); 2720 snd_pcm_stream_unlock_irq(substream); 2721 return err; 2722 } 2723 2724 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2725 snd_pcm_sframes_t *delay) 2726 { 2727 int err; 2728 snd_pcm_sframes_t n = 0; 2729 2730 snd_pcm_stream_lock_irq(substream); 2731 err = do_pcm_hwsync(substream); 2732 if (!err) 2733 n = snd_pcm_calc_delay(substream); 2734 snd_pcm_stream_unlock_irq(substream); 2735 if (!err) 2736 *delay = n; 2737 return err; 2738 } 2739 2740 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2741 struct snd_pcm_sync_ptr __user *_sync_ptr) 2742 { 2743 struct snd_pcm_runtime *runtime = substream->runtime; 2744 struct snd_pcm_sync_ptr sync_ptr; 2745 volatile struct snd_pcm_mmap_status *status; 2746 volatile struct snd_pcm_mmap_control *control; 2747 int err; 2748 2749 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2750 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2751 return -EFAULT; 2752 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2753 return -EFAULT; 2754 status = runtime->status; 2755 control = runtime->control; 2756 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2757 err = snd_pcm_hwsync(substream); 2758 if (err < 0) 2759 return err; 2760 } 2761 snd_pcm_stream_lock_irq(substream); 2762 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2763 err = pcm_lib_apply_appl_ptr(substream, 2764 sync_ptr.c.control.appl_ptr); 2765 if (err < 0) { 2766 snd_pcm_stream_unlock_irq(substream); 2767 return err; 2768 } 2769 } else { 2770 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2771 } 2772 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2773 control->avail_min = sync_ptr.c.control.avail_min; 2774 else 2775 sync_ptr.c.control.avail_min = control->avail_min; 2776 sync_ptr.s.status.state = status->state; 2777 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2778 sync_ptr.s.status.tstamp = status->tstamp; 2779 sync_ptr.s.status.suspended_state = status->suspended_state; 2780 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2781 snd_pcm_stream_unlock_irq(substream); 2782 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2783 return -EFAULT; 2784 return 0; 2785 } 2786 2787 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2788 { 2789 struct snd_pcm_runtime *runtime = substream->runtime; 2790 int arg; 2791 2792 if (get_user(arg, _arg)) 2793 return -EFAULT; 2794 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2795 return -EINVAL; 2796 runtime->tstamp_type = arg; 2797 return 0; 2798 } 2799 2800 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2801 struct snd_xferi __user *_xferi) 2802 { 2803 struct snd_xferi xferi; 2804 struct snd_pcm_runtime *runtime = substream->runtime; 2805 snd_pcm_sframes_t result; 2806 2807 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2808 return -EBADFD; 2809 if (put_user(0, &_xferi->result)) 2810 return -EFAULT; 2811 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2812 return -EFAULT; 2813 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2814 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2815 else 2816 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2817 __put_user(result, &_xferi->result); 2818 return result < 0 ? result : 0; 2819 } 2820 2821 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2822 struct snd_xfern __user *_xfern) 2823 { 2824 struct snd_xfern xfern; 2825 struct snd_pcm_runtime *runtime = substream->runtime; 2826 void *bufs; 2827 snd_pcm_sframes_t result; 2828 2829 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2830 return -EBADFD; 2831 if (runtime->channels > 128) 2832 return -EINVAL; 2833 if (put_user(0, &_xfern->result)) 2834 return -EFAULT; 2835 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2836 return -EFAULT; 2837 2838 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2839 if (IS_ERR(bufs)) 2840 return PTR_ERR(bufs); 2841 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2842 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2843 else 2844 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2845 kfree(bufs); 2846 __put_user(result, &_xfern->result); 2847 return result < 0 ? result : 0; 2848 } 2849 2850 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2851 snd_pcm_uframes_t __user *_frames) 2852 { 2853 snd_pcm_uframes_t frames; 2854 snd_pcm_sframes_t result; 2855 2856 if (get_user(frames, _frames)) 2857 return -EFAULT; 2858 if (put_user(0, _frames)) 2859 return -EFAULT; 2860 result = snd_pcm_rewind(substream, frames); 2861 __put_user(result, _frames); 2862 return result < 0 ? result : 0; 2863 } 2864 2865 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2866 snd_pcm_uframes_t __user *_frames) 2867 { 2868 snd_pcm_uframes_t frames; 2869 snd_pcm_sframes_t result; 2870 2871 if (get_user(frames, _frames)) 2872 return -EFAULT; 2873 if (put_user(0, _frames)) 2874 return -EFAULT; 2875 result = snd_pcm_forward(substream, frames); 2876 __put_user(result, _frames); 2877 return result < 0 ? result : 0; 2878 } 2879 2880 static int snd_pcm_common_ioctl(struct file *file, 2881 struct snd_pcm_substream *substream, 2882 unsigned int cmd, void __user *arg) 2883 { 2884 struct snd_pcm_file *pcm_file = file->private_data; 2885 int res; 2886 2887 if (PCM_RUNTIME_CHECK(substream)) 2888 return -ENXIO; 2889 2890 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2891 if (res < 0) 2892 return res; 2893 2894 switch (cmd) { 2895 case SNDRV_PCM_IOCTL_PVERSION: 2896 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2897 case SNDRV_PCM_IOCTL_INFO: 2898 return snd_pcm_info_user(substream, arg); 2899 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2900 return 0; 2901 case SNDRV_PCM_IOCTL_TTSTAMP: 2902 return snd_pcm_tstamp(substream, arg); 2903 case SNDRV_PCM_IOCTL_USER_PVERSION: 2904 if (get_user(pcm_file->user_pversion, 2905 (unsigned int __user *)arg)) 2906 return -EFAULT; 2907 return 0; 2908 case SNDRV_PCM_IOCTL_HW_REFINE: 2909 return snd_pcm_hw_refine_user(substream, arg); 2910 case SNDRV_PCM_IOCTL_HW_PARAMS: 2911 return snd_pcm_hw_params_user(substream, arg); 2912 case SNDRV_PCM_IOCTL_HW_FREE: 2913 return snd_pcm_hw_free(substream); 2914 case SNDRV_PCM_IOCTL_SW_PARAMS: 2915 return snd_pcm_sw_params_user(substream, arg); 2916 case SNDRV_PCM_IOCTL_STATUS: 2917 return snd_pcm_status_user(substream, arg, false); 2918 case SNDRV_PCM_IOCTL_STATUS_EXT: 2919 return snd_pcm_status_user(substream, arg, true); 2920 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2921 return snd_pcm_channel_info_user(substream, arg); 2922 case SNDRV_PCM_IOCTL_PREPARE: 2923 return snd_pcm_prepare(substream, file); 2924 case SNDRV_PCM_IOCTL_RESET: 2925 return snd_pcm_reset(substream); 2926 case SNDRV_PCM_IOCTL_START: 2927 return snd_pcm_start_lock_irq(substream); 2928 case SNDRV_PCM_IOCTL_LINK: 2929 return snd_pcm_link(substream, (int)(unsigned long) arg); 2930 case SNDRV_PCM_IOCTL_UNLINK: 2931 return snd_pcm_unlink(substream); 2932 case SNDRV_PCM_IOCTL_RESUME: 2933 return snd_pcm_resume(substream); 2934 case SNDRV_PCM_IOCTL_XRUN: 2935 return snd_pcm_xrun(substream); 2936 case SNDRV_PCM_IOCTL_HWSYNC: 2937 return snd_pcm_hwsync(substream); 2938 case SNDRV_PCM_IOCTL_DELAY: 2939 { 2940 snd_pcm_sframes_t delay; 2941 snd_pcm_sframes_t __user *res = arg; 2942 int err; 2943 2944 err = snd_pcm_delay(substream, &delay); 2945 if (err) 2946 return err; 2947 if (put_user(delay, res)) 2948 return -EFAULT; 2949 return 0; 2950 } 2951 case SNDRV_PCM_IOCTL_SYNC_PTR: 2952 return snd_pcm_sync_ptr(substream, arg); 2953 #ifdef CONFIG_SND_SUPPORT_OLD_API 2954 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2955 return snd_pcm_hw_refine_old_user(substream, arg); 2956 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2957 return snd_pcm_hw_params_old_user(substream, arg); 2958 #endif 2959 case SNDRV_PCM_IOCTL_DRAIN: 2960 return snd_pcm_drain(substream, file); 2961 case SNDRV_PCM_IOCTL_DROP: 2962 return snd_pcm_drop(substream); 2963 case SNDRV_PCM_IOCTL_PAUSE: 2964 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2965 substream, 2966 (int)(unsigned long)arg); 2967 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2968 case SNDRV_PCM_IOCTL_READI_FRAMES: 2969 return snd_pcm_xferi_frames_ioctl(substream, arg); 2970 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2971 case SNDRV_PCM_IOCTL_READN_FRAMES: 2972 return snd_pcm_xfern_frames_ioctl(substream, arg); 2973 case SNDRV_PCM_IOCTL_REWIND: 2974 return snd_pcm_rewind_ioctl(substream, arg); 2975 case SNDRV_PCM_IOCTL_FORWARD: 2976 return snd_pcm_forward_ioctl(substream, arg); 2977 } 2978 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2979 return -ENOTTY; 2980 } 2981 2982 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 2983 unsigned long arg) 2984 { 2985 struct snd_pcm_file *pcm_file; 2986 2987 pcm_file = file->private_data; 2988 2989 if (((cmd >> 8) & 0xff) != 'A') 2990 return -ENOTTY; 2991 2992 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 2993 (void __user *)arg); 2994 } 2995 2996 /** 2997 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 2998 * @substream: PCM substream 2999 * @cmd: IOCTL cmd 3000 * @arg: IOCTL argument 3001 * 3002 * The function is provided primarily for OSS layer and USB gadget drivers, 3003 * and it allows only the limited set of ioctls (hw_params, sw_params, 3004 * prepare, start, drain, drop, forward). 3005 */ 3006 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3007 unsigned int cmd, void *arg) 3008 { 3009 snd_pcm_uframes_t *frames = arg; 3010 snd_pcm_sframes_t result; 3011 3012 switch (cmd) { 3013 case SNDRV_PCM_IOCTL_FORWARD: 3014 { 3015 /* provided only for OSS; capture-only and no value returned */ 3016 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3017 return -EINVAL; 3018 result = snd_pcm_forward(substream, *frames); 3019 return result < 0 ? result : 0; 3020 } 3021 case SNDRV_PCM_IOCTL_HW_PARAMS: 3022 return snd_pcm_hw_params(substream, arg); 3023 case SNDRV_PCM_IOCTL_SW_PARAMS: 3024 return snd_pcm_sw_params(substream, arg); 3025 case SNDRV_PCM_IOCTL_PREPARE: 3026 return snd_pcm_prepare(substream, NULL); 3027 case SNDRV_PCM_IOCTL_START: 3028 return snd_pcm_start_lock_irq(substream); 3029 case SNDRV_PCM_IOCTL_DRAIN: 3030 return snd_pcm_drain(substream, NULL); 3031 case SNDRV_PCM_IOCTL_DROP: 3032 return snd_pcm_drop(substream); 3033 case SNDRV_PCM_IOCTL_DELAY: 3034 return snd_pcm_delay(substream, frames); 3035 default: 3036 return -EINVAL; 3037 } 3038 } 3039 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3040 3041 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3042 loff_t * offset) 3043 { 3044 struct snd_pcm_file *pcm_file; 3045 struct snd_pcm_substream *substream; 3046 struct snd_pcm_runtime *runtime; 3047 snd_pcm_sframes_t result; 3048 3049 pcm_file = file->private_data; 3050 substream = pcm_file->substream; 3051 if (PCM_RUNTIME_CHECK(substream)) 3052 return -ENXIO; 3053 runtime = substream->runtime; 3054 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3055 return -EBADFD; 3056 if (!frame_aligned(runtime, count)) 3057 return -EINVAL; 3058 count = bytes_to_frames(runtime, count); 3059 result = snd_pcm_lib_read(substream, buf, count); 3060 if (result > 0) 3061 result = frames_to_bytes(runtime, result); 3062 return result; 3063 } 3064 3065 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3066 size_t count, loff_t * offset) 3067 { 3068 struct snd_pcm_file *pcm_file; 3069 struct snd_pcm_substream *substream; 3070 struct snd_pcm_runtime *runtime; 3071 snd_pcm_sframes_t result; 3072 3073 pcm_file = file->private_data; 3074 substream = pcm_file->substream; 3075 if (PCM_RUNTIME_CHECK(substream)) 3076 return -ENXIO; 3077 runtime = substream->runtime; 3078 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3079 return -EBADFD; 3080 if (!frame_aligned(runtime, count)) 3081 return -EINVAL; 3082 count = bytes_to_frames(runtime, count); 3083 result = snd_pcm_lib_write(substream, buf, count); 3084 if (result > 0) 3085 result = frames_to_bytes(runtime, result); 3086 return result; 3087 } 3088 3089 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3090 { 3091 struct snd_pcm_file *pcm_file; 3092 struct snd_pcm_substream *substream; 3093 struct snd_pcm_runtime *runtime; 3094 snd_pcm_sframes_t result; 3095 unsigned long i; 3096 void __user **bufs; 3097 snd_pcm_uframes_t frames; 3098 3099 pcm_file = iocb->ki_filp->private_data; 3100 substream = pcm_file->substream; 3101 if (PCM_RUNTIME_CHECK(substream)) 3102 return -ENXIO; 3103 runtime = substream->runtime; 3104 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3105 return -EBADFD; 3106 if (!iter_is_iovec(to)) 3107 return -EINVAL; 3108 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3109 return -EINVAL; 3110 if (!frame_aligned(runtime, to->iov->iov_len)) 3111 return -EINVAL; 3112 frames = bytes_to_samples(runtime, to->iov->iov_len); 3113 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3114 if (bufs == NULL) 3115 return -ENOMEM; 3116 for (i = 0; i < to->nr_segs; ++i) 3117 bufs[i] = to->iov[i].iov_base; 3118 result = snd_pcm_lib_readv(substream, bufs, frames); 3119 if (result > 0) 3120 result = frames_to_bytes(runtime, result); 3121 kfree(bufs); 3122 return result; 3123 } 3124 3125 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3126 { 3127 struct snd_pcm_file *pcm_file; 3128 struct snd_pcm_substream *substream; 3129 struct snd_pcm_runtime *runtime; 3130 snd_pcm_sframes_t result; 3131 unsigned long i; 3132 void __user **bufs; 3133 snd_pcm_uframes_t frames; 3134 3135 pcm_file = iocb->ki_filp->private_data; 3136 substream = pcm_file->substream; 3137 if (PCM_RUNTIME_CHECK(substream)) 3138 return -ENXIO; 3139 runtime = substream->runtime; 3140 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3141 return -EBADFD; 3142 if (!iter_is_iovec(from)) 3143 return -EINVAL; 3144 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3145 !frame_aligned(runtime, from->iov->iov_len)) 3146 return -EINVAL; 3147 frames = bytes_to_samples(runtime, from->iov->iov_len); 3148 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3149 if (bufs == NULL) 3150 return -ENOMEM; 3151 for (i = 0; i < from->nr_segs; ++i) 3152 bufs[i] = from->iov[i].iov_base; 3153 result = snd_pcm_lib_writev(substream, bufs, frames); 3154 if (result > 0) 3155 result = frames_to_bytes(runtime, result); 3156 kfree(bufs); 3157 return result; 3158 } 3159 3160 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3161 { 3162 struct snd_pcm_file *pcm_file; 3163 struct snd_pcm_substream *substream; 3164 struct snd_pcm_runtime *runtime; 3165 __poll_t mask, ok; 3166 snd_pcm_uframes_t avail; 3167 3168 pcm_file = file->private_data; 3169 3170 substream = pcm_file->substream; 3171 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3172 ok = EPOLLOUT | EPOLLWRNORM; 3173 else 3174 ok = EPOLLIN | EPOLLRDNORM; 3175 if (PCM_RUNTIME_CHECK(substream)) 3176 return ok | EPOLLERR; 3177 3178 runtime = substream->runtime; 3179 poll_wait(file, &runtime->sleep, wait); 3180 3181 mask = 0; 3182 snd_pcm_stream_lock_irq(substream); 3183 avail = snd_pcm_avail(substream); 3184 switch (runtime->status->state) { 3185 case SNDRV_PCM_STATE_RUNNING: 3186 case SNDRV_PCM_STATE_PREPARED: 3187 case SNDRV_PCM_STATE_PAUSED: 3188 if (avail >= runtime->control->avail_min) 3189 mask = ok; 3190 break; 3191 case SNDRV_PCM_STATE_DRAINING: 3192 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3193 mask = ok; 3194 if (!avail) 3195 mask |= EPOLLERR; 3196 } 3197 break; 3198 default: 3199 mask = ok | EPOLLERR; 3200 break; 3201 } 3202 snd_pcm_stream_unlock_irq(substream); 3203 return mask; 3204 } 3205 3206 /* 3207 * mmap support 3208 */ 3209 3210 /* 3211 * Only on coherent architectures, we can mmap the status and the control records 3212 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3213 */ 3214 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3215 /* 3216 * mmap status record 3217 */ 3218 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3219 { 3220 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3221 struct snd_pcm_runtime *runtime; 3222 3223 if (substream == NULL) 3224 return VM_FAULT_SIGBUS; 3225 runtime = substream->runtime; 3226 vmf->page = virt_to_page(runtime->status); 3227 get_page(vmf->page); 3228 return 0; 3229 } 3230 3231 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3232 { 3233 .fault = snd_pcm_mmap_status_fault, 3234 }; 3235 3236 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3237 struct vm_area_struct *area) 3238 { 3239 long size; 3240 if (!(area->vm_flags & VM_READ)) 3241 return -EINVAL; 3242 size = area->vm_end - area->vm_start; 3243 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3244 return -EINVAL; 3245 area->vm_ops = &snd_pcm_vm_ops_status; 3246 area->vm_private_data = substream; 3247 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3248 return 0; 3249 } 3250 3251 /* 3252 * mmap control record 3253 */ 3254 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3255 { 3256 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3257 struct snd_pcm_runtime *runtime; 3258 3259 if (substream == NULL) 3260 return VM_FAULT_SIGBUS; 3261 runtime = substream->runtime; 3262 vmf->page = virt_to_page(runtime->control); 3263 get_page(vmf->page); 3264 return 0; 3265 } 3266 3267 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3268 { 3269 .fault = snd_pcm_mmap_control_fault, 3270 }; 3271 3272 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3273 struct vm_area_struct *area) 3274 { 3275 long size; 3276 if (!(area->vm_flags & VM_READ)) 3277 return -EINVAL; 3278 size = area->vm_end - area->vm_start; 3279 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3280 return -EINVAL; 3281 area->vm_ops = &snd_pcm_vm_ops_control; 3282 area->vm_private_data = substream; 3283 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3284 return 0; 3285 } 3286 3287 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3288 { 3289 if (pcm_file->no_compat_mmap) 3290 return false; 3291 /* See pcm_control_mmap_allowed() below. 3292 * Since older alsa-lib requires both status and control mmaps to be 3293 * coupled, we have to disable the status mmap for old alsa-lib, too. 3294 */ 3295 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3296 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3297 return false; 3298 return true; 3299 } 3300 3301 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3302 { 3303 if (pcm_file->no_compat_mmap) 3304 return false; 3305 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3306 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3307 * thus it effectively assures the manual update of appl_ptr. 3308 */ 3309 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3310 return false; 3311 return true; 3312 } 3313 3314 #else /* ! coherent mmap */ 3315 /* 3316 * don't support mmap for status and control records. 3317 */ 3318 #define pcm_status_mmap_allowed(pcm_file) false 3319 #define pcm_control_mmap_allowed(pcm_file) false 3320 3321 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3322 struct vm_area_struct *area) 3323 { 3324 return -ENXIO; 3325 } 3326 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3327 struct vm_area_struct *area) 3328 { 3329 return -ENXIO; 3330 } 3331 #endif /* coherent mmap */ 3332 3333 static inline struct page * 3334 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3335 { 3336 void *vaddr = substream->runtime->dma_area + ofs; 3337 return virt_to_page(vaddr); 3338 } 3339 3340 /* 3341 * fault callback for mmapping a RAM page 3342 */ 3343 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3344 { 3345 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3346 struct snd_pcm_runtime *runtime; 3347 unsigned long offset; 3348 struct page * page; 3349 size_t dma_bytes; 3350 3351 if (substream == NULL) 3352 return VM_FAULT_SIGBUS; 3353 runtime = substream->runtime; 3354 offset = vmf->pgoff << PAGE_SHIFT; 3355 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3356 if (offset > dma_bytes - PAGE_SIZE) 3357 return VM_FAULT_SIGBUS; 3358 if (substream->ops->page) 3359 page = substream->ops->page(substream, offset); 3360 else 3361 page = snd_pcm_default_page_ops(substream, offset); 3362 if (!page) 3363 return VM_FAULT_SIGBUS; 3364 get_page(page); 3365 vmf->page = page; 3366 return 0; 3367 } 3368 3369 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3370 .open = snd_pcm_mmap_data_open, 3371 .close = snd_pcm_mmap_data_close, 3372 }; 3373 3374 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3375 .open = snd_pcm_mmap_data_open, 3376 .close = snd_pcm_mmap_data_close, 3377 .fault = snd_pcm_mmap_data_fault, 3378 }; 3379 3380 /* 3381 * mmap the DMA buffer on RAM 3382 */ 3383 3384 /** 3385 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3386 * @substream: PCM substream 3387 * @area: VMA 3388 * 3389 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3390 * this function is invoked implicitly. 3391 */ 3392 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3393 struct vm_area_struct *area) 3394 { 3395 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3396 #ifdef CONFIG_GENERIC_ALLOCATOR 3397 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3398 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3399 return remap_pfn_range(area, area->vm_start, 3400 substream->dma_buffer.addr >> PAGE_SHIFT, 3401 area->vm_end - area->vm_start, area->vm_page_prot); 3402 } 3403 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3404 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3405 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3406 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3407 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3408 area, 3409 substream->runtime->dma_area, 3410 substream->runtime->dma_addr, 3411 substream->runtime->dma_bytes); 3412 #endif /* CONFIG_X86 */ 3413 /* mmap with fault handler */ 3414 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3415 return 0; 3416 } 3417 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3418 3419 /* 3420 * mmap the DMA buffer on I/O memory area 3421 */ 3422 #if SNDRV_PCM_INFO_MMAP_IOMEM 3423 /** 3424 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3425 * @substream: PCM substream 3426 * @area: VMA 3427 * 3428 * When your hardware uses the iomapped pages as the hardware buffer and 3429 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3430 * is supposed to work only on limited architectures. 3431 */ 3432 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3433 struct vm_area_struct *area) 3434 { 3435 struct snd_pcm_runtime *runtime = substream->runtime; 3436 3437 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3438 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3439 } 3440 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3441 #endif /* SNDRV_PCM_INFO_MMAP */ 3442 3443 /* 3444 * mmap DMA buffer 3445 */ 3446 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3447 struct vm_area_struct *area) 3448 { 3449 struct snd_pcm_runtime *runtime; 3450 long size; 3451 unsigned long offset; 3452 size_t dma_bytes; 3453 int err; 3454 3455 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3456 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3457 return -EINVAL; 3458 } else { 3459 if (!(area->vm_flags & VM_READ)) 3460 return -EINVAL; 3461 } 3462 runtime = substream->runtime; 3463 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3464 return -EBADFD; 3465 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3466 return -ENXIO; 3467 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3468 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3469 return -EINVAL; 3470 size = area->vm_end - area->vm_start; 3471 offset = area->vm_pgoff << PAGE_SHIFT; 3472 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3473 if ((size_t)size > dma_bytes) 3474 return -EINVAL; 3475 if (offset > dma_bytes - size) 3476 return -EINVAL; 3477 3478 area->vm_ops = &snd_pcm_vm_ops_data; 3479 area->vm_private_data = substream; 3480 if (substream->ops->mmap) 3481 err = substream->ops->mmap(substream, area); 3482 else 3483 err = snd_pcm_lib_default_mmap(substream, area); 3484 if (!err) 3485 atomic_inc(&substream->mmap_count); 3486 return err; 3487 } 3488 EXPORT_SYMBOL(snd_pcm_mmap_data); 3489 3490 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3491 { 3492 struct snd_pcm_file * pcm_file; 3493 struct snd_pcm_substream *substream; 3494 unsigned long offset; 3495 3496 pcm_file = file->private_data; 3497 substream = pcm_file->substream; 3498 if (PCM_RUNTIME_CHECK(substream)) 3499 return -ENXIO; 3500 3501 offset = area->vm_pgoff << PAGE_SHIFT; 3502 switch (offset) { 3503 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3504 if (!pcm_status_mmap_allowed(pcm_file)) 3505 return -ENXIO; 3506 return snd_pcm_mmap_status(substream, file, area); 3507 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3508 if (!pcm_control_mmap_allowed(pcm_file)) 3509 return -ENXIO; 3510 return snd_pcm_mmap_control(substream, file, area); 3511 default: 3512 return snd_pcm_mmap_data(substream, file, area); 3513 } 3514 return 0; 3515 } 3516 3517 static int snd_pcm_fasync(int fd, struct file * file, int on) 3518 { 3519 struct snd_pcm_file * pcm_file; 3520 struct snd_pcm_substream *substream; 3521 struct snd_pcm_runtime *runtime; 3522 3523 pcm_file = file->private_data; 3524 substream = pcm_file->substream; 3525 if (PCM_RUNTIME_CHECK(substream)) 3526 return -ENXIO; 3527 runtime = substream->runtime; 3528 return fasync_helper(fd, file, on, &runtime->fasync); 3529 } 3530 3531 /* 3532 * ioctl32 compat 3533 */ 3534 #ifdef CONFIG_COMPAT 3535 #include "pcm_compat.c" 3536 #else 3537 #define snd_pcm_ioctl_compat NULL 3538 #endif 3539 3540 /* 3541 * To be removed helpers to keep binary compatibility 3542 */ 3543 3544 #ifdef CONFIG_SND_SUPPORT_OLD_API 3545 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3546 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3547 3548 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3549 struct snd_pcm_hw_params_old *oparams) 3550 { 3551 unsigned int i; 3552 3553 memset(params, 0, sizeof(*params)); 3554 params->flags = oparams->flags; 3555 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3556 params->masks[i].bits[0] = oparams->masks[i]; 3557 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3558 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3559 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3560 params->info = oparams->info; 3561 params->msbits = oparams->msbits; 3562 params->rate_num = oparams->rate_num; 3563 params->rate_den = oparams->rate_den; 3564 params->fifo_size = oparams->fifo_size; 3565 } 3566 3567 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3568 struct snd_pcm_hw_params *params) 3569 { 3570 unsigned int i; 3571 3572 memset(oparams, 0, sizeof(*oparams)); 3573 oparams->flags = params->flags; 3574 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3575 oparams->masks[i] = params->masks[i].bits[0]; 3576 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3577 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3578 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3579 oparams->info = params->info; 3580 oparams->msbits = params->msbits; 3581 oparams->rate_num = params->rate_num; 3582 oparams->rate_den = params->rate_den; 3583 oparams->fifo_size = params->fifo_size; 3584 } 3585 3586 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3587 struct snd_pcm_hw_params_old __user * _oparams) 3588 { 3589 struct snd_pcm_hw_params *params; 3590 struct snd_pcm_hw_params_old *oparams = NULL; 3591 int err; 3592 3593 params = kmalloc(sizeof(*params), GFP_KERNEL); 3594 if (!params) 3595 return -ENOMEM; 3596 3597 oparams = memdup_user(_oparams, sizeof(*oparams)); 3598 if (IS_ERR(oparams)) { 3599 err = PTR_ERR(oparams); 3600 goto out; 3601 } 3602 snd_pcm_hw_convert_from_old_params(params, oparams); 3603 err = snd_pcm_hw_refine(substream, params); 3604 if (err < 0) 3605 goto out_old; 3606 3607 err = fixup_unreferenced_params(substream, params); 3608 if (err < 0) 3609 goto out_old; 3610 3611 snd_pcm_hw_convert_to_old_params(oparams, params); 3612 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3613 err = -EFAULT; 3614 out_old: 3615 kfree(oparams); 3616 out: 3617 kfree(params); 3618 return err; 3619 } 3620 3621 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3622 struct snd_pcm_hw_params_old __user * _oparams) 3623 { 3624 struct snd_pcm_hw_params *params; 3625 struct snd_pcm_hw_params_old *oparams = NULL; 3626 int err; 3627 3628 params = kmalloc(sizeof(*params), GFP_KERNEL); 3629 if (!params) 3630 return -ENOMEM; 3631 3632 oparams = memdup_user(_oparams, sizeof(*oparams)); 3633 if (IS_ERR(oparams)) { 3634 err = PTR_ERR(oparams); 3635 goto out; 3636 } 3637 3638 snd_pcm_hw_convert_from_old_params(params, oparams); 3639 err = snd_pcm_hw_params(substream, params); 3640 if (err < 0) 3641 goto out_old; 3642 3643 snd_pcm_hw_convert_to_old_params(oparams, params); 3644 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3645 err = -EFAULT; 3646 out_old: 3647 kfree(oparams); 3648 out: 3649 kfree(params); 3650 return err; 3651 } 3652 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3653 3654 #ifndef CONFIG_MMU 3655 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3656 unsigned long addr, 3657 unsigned long len, 3658 unsigned long pgoff, 3659 unsigned long flags) 3660 { 3661 struct snd_pcm_file *pcm_file = file->private_data; 3662 struct snd_pcm_substream *substream = pcm_file->substream; 3663 struct snd_pcm_runtime *runtime = substream->runtime; 3664 unsigned long offset = pgoff << PAGE_SHIFT; 3665 3666 switch (offset) { 3667 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3668 return (unsigned long)runtime->status; 3669 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3670 return (unsigned long)runtime->control; 3671 default: 3672 return (unsigned long)runtime->dma_area + offset; 3673 } 3674 } 3675 #else 3676 # define snd_pcm_get_unmapped_area NULL 3677 #endif 3678 3679 /* 3680 * Register section 3681 */ 3682 3683 const struct file_operations snd_pcm_f_ops[2] = { 3684 { 3685 .owner = THIS_MODULE, 3686 .write = snd_pcm_write, 3687 .write_iter = snd_pcm_writev, 3688 .open = snd_pcm_playback_open, 3689 .release = snd_pcm_release, 3690 .llseek = no_llseek, 3691 .poll = snd_pcm_poll, 3692 .unlocked_ioctl = snd_pcm_ioctl, 3693 .compat_ioctl = snd_pcm_ioctl_compat, 3694 .mmap = snd_pcm_mmap, 3695 .fasync = snd_pcm_fasync, 3696 .get_unmapped_area = snd_pcm_get_unmapped_area, 3697 }, 3698 { 3699 .owner = THIS_MODULE, 3700 .read = snd_pcm_read, 3701 .read_iter = snd_pcm_readv, 3702 .open = snd_pcm_capture_open, 3703 .release = snd_pcm_release, 3704 .llseek = no_llseek, 3705 .poll = snd_pcm_poll, 3706 .unlocked_ioctl = snd_pcm_ioctl, 3707 .compat_ioctl = snd_pcm_ioctl_compat, 3708 .mmap = snd_pcm_mmap, 3709 .fasync = snd_pcm_fasync, 3710 .get_unmapped_area = snd_pcm_get_unmapped_area, 3711 } 3712 }; 3713