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 /* architecture supports dma_mmap_coherent()? */ 224 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA) 225 if (!substream->ops->mmap && 226 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 227 return false; 228 #endif 229 return true; 230 } 231 232 static int constrain_mask_params(struct snd_pcm_substream *substream, 233 struct snd_pcm_hw_params *params) 234 { 235 struct snd_pcm_hw_constraints *constrs = 236 &substream->runtime->hw_constraints; 237 struct snd_mask *m; 238 unsigned int k; 239 struct snd_mask old_mask; 240 int changed; 241 242 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 243 m = hw_param_mask(params, k); 244 if (snd_mask_empty(m)) 245 return -EINVAL; 246 247 /* This parameter is not requested to change by a caller. */ 248 if (!(params->rmask & (1 << k))) 249 continue; 250 251 if (trace_hw_mask_param_enabled()) 252 old_mask = *m; 253 254 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 255 if (changed < 0) 256 return changed; 257 if (changed == 0) 258 continue; 259 260 /* Set corresponding flag so that the caller gets it. */ 261 trace_hw_mask_param(substream, k, 0, &old_mask, m); 262 params->cmask |= 1 << k; 263 } 264 265 return 0; 266 } 267 268 static int constrain_interval_params(struct snd_pcm_substream *substream, 269 struct snd_pcm_hw_params *params) 270 { 271 struct snd_pcm_hw_constraints *constrs = 272 &substream->runtime->hw_constraints; 273 struct snd_interval *i; 274 unsigned int k; 275 struct snd_interval old_interval; 276 int changed; 277 278 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 279 i = hw_param_interval(params, k); 280 if (snd_interval_empty(i)) 281 return -EINVAL; 282 283 /* This parameter is not requested to change by a caller. */ 284 if (!(params->rmask & (1 << k))) 285 continue; 286 287 if (trace_hw_interval_param_enabled()) 288 old_interval = *i; 289 290 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 291 if (changed < 0) 292 return changed; 293 if (changed == 0) 294 continue; 295 296 /* Set corresponding flag so that the caller gets it. */ 297 trace_hw_interval_param(substream, k, 0, &old_interval, i); 298 params->cmask |= 1 << k; 299 } 300 301 return 0; 302 } 303 304 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 305 struct snd_pcm_hw_params *params) 306 { 307 struct snd_pcm_hw_constraints *constrs = 308 &substream->runtime->hw_constraints; 309 unsigned int k; 310 unsigned int *rstamps; 311 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 312 unsigned int stamp; 313 struct snd_pcm_hw_rule *r; 314 unsigned int d; 315 struct snd_mask old_mask; 316 struct snd_interval old_interval; 317 bool again; 318 int changed, err = 0; 319 320 /* 321 * Each application of rule has own sequence number. 322 * 323 * Each member of 'rstamps' array represents the sequence number of 324 * recent application of corresponding rule. 325 */ 326 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 327 if (!rstamps) 328 return -ENOMEM; 329 330 /* 331 * Each member of 'vstamps' array represents the sequence number of 332 * recent application of rule in which corresponding parameters were 333 * changed. 334 * 335 * In initial state, elements corresponding to parameters requested by 336 * a caller is 1. For unrequested parameters, corresponding members 337 * have 0 so that the parameters are never changed anymore. 338 */ 339 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 340 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 341 342 /* Due to the above design, actual sequence number starts at 2. */ 343 stamp = 2; 344 retry: 345 /* Apply all rules in order. */ 346 again = false; 347 for (k = 0; k < constrs->rules_num; k++) { 348 r = &constrs->rules[k]; 349 350 /* 351 * Check condition bits of this rule. When the rule has 352 * some condition bits, parameter without the bits is 353 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 354 * is an example of the condition bits. 355 */ 356 if (r->cond && !(r->cond & params->flags)) 357 continue; 358 359 /* 360 * The 'deps' array includes maximum three dependencies 361 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 362 * member of this array is a sentinel and should be 363 * negative value. 364 * 365 * This rule should be processed in this time when dependent 366 * parameters were changed at former applications of the other 367 * rules. 368 */ 369 for (d = 0; r->deps[d] >= 0; d++) { 370 if (vstamps[r->deps[d]] > rstamps[k]) 371 break; 372 } 373 if (r->deps[d] < 0) 374 continue; 375 376 if (trace_hw_mask_param_enabled()) { 377 if (hw_is_mask(r->var)) 378 old_mask = *hw_param_mask(params, r->var); 379 } 380 if (trace_hw_interval_param_enabled()) { 381 if (hw_is_interval(r->var)) 382 old_interval = *hw_param_interval(params, r->var); 383 } 384 385 changed = r->func(params, r); 386 if (changed < 0) { 387 err = changed; 388 goto out; 389 } 390 391 /* 392 * When the parameter is changed, notify it to the caller 393 * by corresponding returned bit, then preparing for next 394 * iteration. 395 */ 396 if (changed && r->var >= 0) { 397 if (hw_is_mask(r->var)) { 398 trace_hw_mask_param(substream, r->var, 399 k + 1, &old_mask, 400 hw_param_mask(params, r->var)); 401 } 402 if (hw_is_interval(r->var)) { 403 trace_hw_interval_param(substream, r->var, 404 k + 1, &old_interval, 405 hw_param_interval(params, r->var)); 406 } 407 408 params->cmask |= (1 << r->var); 409 vstamps[r->var] = stamp; 410 again = true; 411 } 412 413 rstamps[k] = stamp++; 414 } 415 416 /* Iterate to evaluate all rules till no parameters are changed. */ 417 if (again) 418 goto retry; 419 420 out: 421 kfree(rstamps); 422 return err; 423 } 424 425 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 426 struct snd_pcm_hw_params *params) 427 { 428 const struct snd_interval *i; 429 const struct snd_mask *m; 430 int err; 431 432 if (!params->msbits) { 433 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 434 if (snd_interval_single(i)) 435 params->msbits = snd_interval_value(i); 436 } 437 438 if (!params->rate_den) { 439 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 440 if (snd_interval_single(i)) { 441 params->rate_num = snd_interval_value(i); 442 params->rate_den = 1; 443 } 444 } 445 446 if (!params->fifo_size) { 447 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 448 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 449 if (snd_mask_single(m) && snd_interval_single(i)) { 450 err = substream->ops->ioctl(substream, 451 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 452 if (err < 0) 453 return err; 454 } 455 } 456 457 if (!params->info) { 458 params->info = substream->runtime->hw.info; 459 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 460 SNDRV_PCM_INFO_DRAIN_TRIGGER); 461 if (!hw_support_mmap(substream)) 462 params->info &= ~(SNDRV_PCM_INFO_MMAP | 463 SNDRV_PCM_INFO_MMAP_VALID); 464 } 465 466 return 0; 467 } 468 469 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 470 struct snd_pcm_hw_params *params) 471 { 472 int err; 473 474 params->info = 0; 475 params->fifo_size = 0; 476 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 477 params->msbits = 0; 478 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 479 params->rate_num = 0; 480 params->rate_den = 0; 481 } 482 483 err = constrain_mask_params(substream, params); 484 if (err < 0) 485 return err; 486 487 err = constrain_interval_params(substream, params); 488 if (err < 0) 489 return err; 490 491 err = constrain_params_by_rules(substream, params); 492 if (err < 0) 493 return err; 494 495 params->rmask = 0; 496 497 return 0; 498 } 499 EXPORT_SYMBOL(snd_pcm_hw_refine); 500 501 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 502 struct snd_pcm_hw_params __user * _params) 503 { 504 struct snd_pcm_hw_params *params; 505 int err; 506 507 params = memdup_user(_params, sizeof(*params)); 508 if (IS_ERR(params)) 509 return PTR_ERR(params); 510 511 err = snd_pcm_hw_refine(substream, params); 512 if (err < 0) 513 goto end; 514 515 err = fixup_unreferenced_params(substream, params); 516 if (err < 0) 517 goto end; 518 519 if (copy_to_user(_params, params, sizeof(*params))) 520 err = -EFAULT; 521 end: 522 kfree(params); 523 return err; 524 } 525 526 static int period_to_usecs(struct snd_pcm_runtime *runtime) 527 { 528 int usecs; 529 530 if (! runtime->rate) 531 return -1; /* invalid */ 532 533 /* take 75% of period time as the deadline */ 534 usecs = (750000 / runtime->rate) * runtime->period_size; 535 usecs += ((750000 % runtime->rate) * runtime->period_size) / 536 runtime->rate; 537 538 return usecs; 539 } 540 541 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 542 { 543 snd_pcm_stream_lock_irq(substream); 544 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 545 substream->runtime->status->state = state; 546 snd_pcm_stream_unlock_irq(substream); 547 } 548 549 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 550 int event) 551 { 552 #ifdef CONFIG_SND_PCM_TIMER 553 if (substream->timer) 554 snd_timer_notify(substream->timer, event, 555 &substream->runtime->trigger_tstamp); 556 #endif 557 } 558 559 /** 560 * snd_pcm_hw_param_choose - choose a configuration defined by @params 561 * @pcm: PCM instance 562 * @params: the hw_params instance 563 * 564 * Choose one configuration from configuration space defined by @params. 565 * The configuration chosen is that obtained fixing in this order: 566 * first access, first format, first subformat, min channels, 567 * min rate, min period time, max buffer size, min tick time 568 * 569 * Return: Zero if successful, or a negative error code on failure. 570 */ 571 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 572 struct snd_pcm_hw_params *params) 573 { 574 static const int vars[] = { 575 SNDRV_PCM_HW_PARAM_ACCESS, 576 SNDRV_PCM_HW_PARAM_FORMAT, 577 SNDRV_PCM_HW_PARAM_SUBFORMAT, 578 SNDRV_PCM_HW_PARAM_CHANNELS, 579 SNDRV_PCM_HW_PARAM_RATE, 580 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 581 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 582 SNDRV_PCM_HW_PARAM_TICK_TIME, 583 -1 584 }; 585 const int *v; 586 struct snd_mask old_mask; 587 struct snd_interval old_interval; 588 int changed; 589 590 for (v = vars; *v != -1; v++) { 591 /* Keep old parameter to trace. */ 592 if (trace_hw_mask_param_enabled()) { 593 if (hw_is_mask(*v)) 594 old_mask = *hw_param_mask(params, *v); 595 } 596 if (trace_hw_interval_param_enabled()) { 597 if (hw_is_interval(*v)) 598 old_interval = *hw_param_interval(params, *v); 599 } 600 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 601 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 602 else 603 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 604 if (changed < 0) 605 return changed; 606 if (changed == 0) 607 continue; 608 609 /* Trace the changed parameter. */ 610 if (hw_is_mask(*v)) { 611 trace_hw_mask_param(pcm, *v, 0, &old_mask, 612 hw_param_mask(params, *v)); 613 } 614 if (hw_is_interval(*v)) { 615 trace_hw_interval_param(pcm, *v, 0, &old_interval, 616 hw_param_interval(params, *v)); 617 } 618 } 619 620 return 0; 621 } 622 623 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 624 struct snd_pcm_hw_params *params) 625 { 626 struct snd_pcm_runtime *runtime; 627 int err, usecs; 628 unsigned int bits; 629 snd_pcm_uframes_t frames; 630 631 if (PCM_RUNTIME_CHECK(substream)) 632 return -ENXIO; 633 runtime = substream->runtime; 634 snd_pcm_stream_lock_irq(substream); 635 switch (runtime->status->state) { 636 case SNDRV_PCM_STATE_OPEN: 637 case SNDRV_PCM_STATE_SETUP: 638 case SNDRV_PCM_STATE_PREPARED: 639 break; 640 default: 641 snd_pcm_stream_unlock_irq(substream); 642 return -EBADFD; 643 } 644 snd_pcm_stream_unlock_irq(substream); 645 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 646 if (!substream->oss.oss) 647 #endif 648 if (atomic_read(&substream->mmap_count)) 649 return -EBADFD; 650 651 params->rmask = ~0U; 652 err = snd_pcm_hw_refine(substream, params); 653 if (err < 0) 654 goto _error; 655 656 err = snd_pcm_hw_params_choose(substream, params); 657 if (err < 0) 658 goto _error; 659 660 err = fixup_unreferenced_params(substream, params); 661 if (err < 0) 662 goto _error; 663 664 if (substream->ops->hw_params != NULL) { 665 err = substream->ops->hw_params(substream, params); 666 if (err < 0) 667 goto _error; 668 } 669 670 runtime->access = params_access(params); 671 runtime->format = params_format(params); 672 runtime->subformat = params_subformat(params); 673 runtime->channels = params_channels(params); 674 runtime->rate = params_rate(params); 675 runtime->period_size = params_period_size(params); 676 runtime->periods = params_periods(params); 677 runtime->buffer_size = params_buffer_size(params); 678 runtime->info = params->info; 679 runtime->rate_num = params->rate_num; 680 runtime->rate_den = params->rate_den; 681 runtime->no_period_wakeup = 682 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 683 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 684 685 bits = snd_pcm_format_physical_width(runtime->format); 686 runtime->sample_bits = bits; 687 bits *= runtime->channels; 688 runtime->frame_bits = bits; 689 frames = 1; 690 while (bits % 8 != 0) { 691 bits *= 2; 692 frames *= 2; 693 } 694 runtime->byte_align = bits / 8; 695 runtime->min_align = frames; 696 697 /* Default sw params */ 698 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 699 runtime->period_step = 1; 700 runtime->control->avail_min = runtime->period_size; 701 runtime->start_threshold = 1; 702 runtime->stop_threshold = runtime->buffer_size; 703 runtime->silence_threshold = 0; 704 runtime->silence_size = 0; 705 runtime->boundary = runtime->buffer_size; 706 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 707 runtime->boundary *= 2; 708 709 snd_pcm_timer_resolution_change(substream); 710 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 711 712 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 713 pm_qos_remove_request(&substream->latency_pm_qos_req); 714 if ((usecs = period_to_usecs(runtime)) >= 0) 715 pm_qos_add_request(&substream->latency_pm_qos_req, 716 PM_QOS_CPU_DMA_LATENCY, usecs); 717 return 0; 718 _error: 719 /* hardware might be unusable from this time, 720 so we force application to retry to set 721 the correct hardware parameter settings */ 722 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 723 if (substream->ops->hw_free != NULL) 724 substream->ops->hw_free(substream); 725 return err; 726 } 727 728 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 729 struct snd_pcm_hw_params __user * _params) 730 { 731 struct snd_pcm_hw_params *params; 732 int err; 733 734 params = memdup_user(_params, sizeof(*params)); 735 if (IS_ERR(params)) 736 return PTR_ERR(params); 737 738 err = snd_pcm_hw_params(substream, params); 739 if (err < 0) 740 goto end; 741 742 if (copy_to_user(_params, params, sizeof(*params))) 743 err = -EFAULT; 744 end: 745 kfree(params); 746 return err; 747 } 748 749 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 750 { 751 struct snd_pcm_runtime *runtime; 752 int result = 0; 753 754 if (PCM_RUNTIME_CHECK(substream)) 755 return -ENXIO; 756 runtime = substream->runtime; 757 snd_pcm_stream_lock_irq(substream); 758 switch (runtime->status->state) { 759 case SNDRV_PCM_STATE_SETUP: 760 case SNDRV_PCM_STATE_PREPARED: 761 break; 762 default: 763 snd_pcm_stream_unlock_irq(substream); 764 return -EBADFD; 765 } 766 snd_pcm_stream_unlock_irq(substream); 767 if (atomic_read(&substream->mmap_count)) 768 return -EBADFD; 769 if (substream->ops->hw_free) 770 result = substream->ops->hw_free(substream); 771 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 772 pm_qos_remove_request(&substream->latency_pm_qos_req); 773 return result; 774 } 775 776 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 777 struct snd_pcm_sw_params *params) 778 { 779 struct snd_pcm_runtime *runtime; 780 int err; 781 782 if (PCM_RUNTIME_CHECK(substream)) 783 return -ENXIO; 784 runtime = substream->runtime; 785 snd_pcm_stream_lock_irq(substream); 786 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 787 snd_pcm_stream_unlock_irq(substream); 788 return -EBADFD; 789 } 790 snd_pcm_stream_unlock_irq(substream); 791 792 if (params->tstamp_mode < 0 || 793 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 794 return -EINVAL; 795 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 796 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 797 return -EINVAL; 798 if (params->avail_min == 0) 799 return -EINVAL; 800 if (params->silence_size >= runtime->boundary) { 801 if (params->silence_threshold != 0) 802 return -EINVAL; 803 } else { 804 if (params->silence_size > params->silence_threshold) 805 return -EINVAL; 806 if (params->silence_threshold > runtime->buffer_size) 807 return -EINVAL; 808 } 809 err = 0; 810 snd_pcm_stream_lock_irq(substream); 811 runtime->tstamp_mode = params->tstamp_mode; 812 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 813 runtime->tstamp_type = params->tstamp_type; 814 runtime->period_step = params->period_step; 815 runtime->control->avail_min = params->avail_min; 816 runtime->start_threshold = params->start_threshold; 817 runtime->stop_threshold = params->stop_threshold; 818 runtime->silence_threshold = params->silence_threshold; 819 runtime->silence_size = params->silence_size; 820 params->boundary = runtime->boundary; 821 if (snd_pcm_running(substream)) { 822 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 823 runtime->silence_size > 0) 824 snd_pcm_playback_silence(substream, ULONG_MAX); 825 err = snd_pcm_update_state(substream, runtime); 826 } 827 snd_pcm_stream_unlock_irq(substream); 828 return err; 829 } 830 831 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 832 struct snd_pcm_sw_params __user * _params) 833 { 834 struct snd_pcm_sw_params params; 835 int err; 836 if (copy_from_user(¶ms, _params, sizeof(params))) 837 return -EFAULT; 838 err = snd_pcm_sw_params(substream, ¶ms); 839 if (copy_to_user(_params, ¶ms, sizeof(params))) 840 return -EFAULT; 841 return err; 842 } 843 844 static inline snd_pcm_uframes_t 845 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 846 { 847 snd_pcm_uframes_t delay; 848 849 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 850 delay = snd_pcm_playback_hw_avail(substream->runtime); 851 else 852 delay = snd_pcm_capture_avail(substream->runtime); 853 return delay + substream->runtime->delay; 854 } 855 856 int snd_pcm_status(struct snd_pcm_substream *substream, 857 struct snd_pcm_status *status) 858 { 859 struct snd_pcm_runtime *runtime = substream->runtime; 860 861 snd_pcm_stream_lock_irq(substream); 862 863 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 864 &runtime->audio_tstamp_config); 865 866 /* backwards compatible behavior */ 867 if (runtime->audio_tstamp_config.type_requested == 868 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 869 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 870 runtime->audio_tstamp_config.type_requested = 871 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 872 else 873 runtime->audio_tstamp_config.type_requested = 874 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 875 runtime->audio_tstamp_report.valid = 0; 876 } else 877 runtime->audio_tstamp_report.valid = 1; 878 879 status->state = runtime->status->state; 880 status->suspended_state = runtime->status->suspended_state; 881 if (status->state == SNDRV_PCM_STATE_OPEN) 882 goto _end; 883 status->trigger_tstamp = runtime->trigger_tstamp; 884 if (snd_pcm_running(substream)) { 885 snd_pcm_update_hw_ptr(substream); 886 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 887 status->tstamp = runtime->status->tstamp; 888 status->driver_tstamp = runtime->driver_tstamp; 889 status->audio_tstamp = 890 runtime->status->audio_tstamp; 891 if (runtime->audio_tstamp_report.valid == 1) 892 /* backwards compatibility, no report provided in COMPAT mode */ 893 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 894 &status->audio_tstamp_accuracy, 895 &runtime->audio_tstamp_report); 896 897 goto _tstamp_end; 898 } 899 } else { 900 /* get tstamp only in fallback mode and only if enabled */ 901 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 902 snd_pcm_gettime(runtime, &status->tstamp); 903 } 904 _tstamp_end: 905 status->appl_ptr = runtime->control->appl_ptr; 906 status->hw_ptr = runtime->status->hw_ptr; 907 status->avail = snd_pcm_avail(substream); 908 status->delay = snd_pcm_running(substream) ? 909 snd_pcm_calc_delay(substream) : 0; 910 status->avail_max = runtime->avail_max; 911 status->overrange = runtime->overrange; 912 runtime->avail_max = 0; 913 runtime->overrange = 0; 914 _end: 915 snd_pcm_stream_unlock_irq(substream); 916 return 0; 917 } 918 919 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 920 struct snd_pcm_status __user * _status, 921 bool ext) 922 { 923 struct snd_pcm_status status; 924 int res; 925 926 memset(&status, 0, sizeof(status)); 927 /* 928 * with extension, parameters are read/write, 929 * get audio_tstamp_data from user, 930 * ignore rest of status structure 931 */ 932 if (ext && get_user(status.audio_tstamp_data, 933 (u32 __user *)(&_status->audio_tstamp_data))) 934 return -EFAULT; 935 res = snd_pcm_status(substream, &status); 936 if (res < 0) 937 return res; 938 if (copy_to_user(_status, &status, sizeof(status))) 939 return -EFAULT; 940 return 0; 941 } 942 943 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 944 struct snd_pcm_channel_info * info) 945 { 946 struct snd_pcm_runtime *runtime; 947 unsigned int channel; 948 949 channel = info->channel; 950 runtime = substream->runtime; 951 snd_pcm_stream_lock_irq(substream); 952 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 953 snd_pcm_stream_unlock_irq(substream); 954 return -EBADFD; 955 } 956 snd_pcm_stream_unlock_irq(substream); 957 if (channel >= runtime->channels) 958 return -EINVAL; 959 memset(info, 0, sizeof(*info)); 960 info->channel = channel; 961 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 962 } 963 964 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 965 struct snd_pcm_channel_info __user * _info) 966 { 967 struct snd_pcm_channel_info info; 968 int res; 969 970 if (copy_from_user(&info, _info, sizeof(info))) 971 return -EFAULT; 972 res = snd_pcm_channel_info(substream, &info); 973 if (res < 0) 974 return res; 975 if (copy_to_user(_info, &info, sizeof(info))) 976 return -EFAULT; 977 return 0; 978 } 979 980 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 981 { 982 struct snd_pcm_runtime *runtime = substream->runtime; 983 if (runtime->trigger_master == NULL) 984 return; 985 if (runtime->trigger_master == substream) { 986 if (!runtime->trigger_tstamp_latched) 987 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 988 } else { 989 snd_pcm_trigger_tstamp(runtime->trigger_master); 990 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 991 } 992 runtime->trigger_master = NULL; 993 } 994 995 struct action_ops { 996 int (*pre_action)(struct snd_pcm_substream *substream, int state); 997 int (*do_action)(struct snd_pcm_substream *substream, int state); 998 void (*undo_action)(struct snd_pcm_substream *substream, int state); 999 void (*post_action)(struct snd_pcm_substream *substream, int state); 1000 }; 1001 1002 /* 1003 * this functions is core for handling of linked stream 1004 * Note: the stream state might be changed also on failure 1005 * Note2: call with calling stream lock + link lock 1006 */ 1007 static int snd_pcm_action_group(const struct action_ops *ops, 1008 struct snd_pcm_substream *substream, 1009 int state, int do_lock) 1010 { 1011 struct snd_pcm_substream *s = NULL; 1012 struct snd_pcm_substream *s1; 1013 int res = 0, depth = 1; 1014 1015 snd_pcm_group_for_each_entry(s, substream) { 1016 if (do_lock && s != substream) { 1017 if (s->pcm->nonatomic) 1018 mutex_lock_nested(&s->self_group.mutex, depth); 1019 else 1020 spin_lock_nested(&s->self_group.lock, depth); 1021 depth++; 1022 } 1023 res = ops->pre_action(s, state); 1024 if (res < 0) 1025 goto _unlock; 1026 } 1027 snd_pcm_group_for_each_entry(s, substream) { 1028 res = ops->do_action(s, state); 1029 if (res < 0) { 1030 if (ops->undo_action) { 1031 snd_pcm_group_for_each_entry(s1, substream) { 1032 if (s1 == s) /* failed stream */ 1033 break; 1034 ops->undo_action(s1, state); 1035 } 1036 } 1037 s = NULL; /* unlock all */ 1038 goto _unlock; 1039 } 1040 } 1041 snd_pcm_group_for_each_entry(s, substream) { 1042 ops->post_action(s, state); 1043 } 1044 _unlock: 1045 if (do_lock) { 1046 /* unlock streams */ 1047 snd_pcm_group_for_each_entry(s1, substream) { 1048 if (s1 != substream) { 1049 if (s1->pcm->nonatomic) 1050 mutex_unlock(&s1->self_group.mutex); 1051 else 1052 spin_unlock(&s1->self_group.lock); 1053 } 1054 if (s1 == s) /* end */ 1055 break; 1056 } 1057 } 1058 return res; 1059 } 1060 1061 /* 1062 * Note: call with stream lock 1063 */ 1064 static int snd_pcm_action_single(const struct action_ops *ops, 1065 struct snd_pcm_substream *substream, 1066 int state) 1067 { 1068 int res; 1069 1070 res = ops->pre_action(substream, state); 1071 if (res < 0) 1072 return res; 1073 res = ops->do_action(substream, state); 1074 if (res == 0) 1075 ops->post_action(substream, state); 1076 else if (ops->undo_action) 1077 ops->undo_action(substream, state); 1078 return res; 1079 } 1080 1081 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1082 struct snd_pcm_group *new_group) 1083 { 1084 substream->group = new_group; 1085 list_move(&substream->link_list, &new_group->substreams); 1086 } 1087 1088 /* 1089 * Unref and unlock the group, but keep the stream lock; 1090 * when the group becomes empty and no longer referred, destroy itself 1091 */ 1092 static void snd_pcm_group_unref(struct snd_pcm_group *group, 1093 struct snd_pcm_substream *substream) 1094 { 1095 bool do_free; 1096 1097 if (!group) 1098 return; 1099 do_free = refcount_dec_and_test(&group->refs); 1100 snd_pcm_group_unlock(group, substream->pcm->nonatomic); 1101 if (do_free) 1102 kfree(group); 1103 } 1104 1105 /* 1106 * Lock the group inside a stream lock and reference it; 1107 * return the locked group object, or NULL if not linked 1108 */ 1109 static struct snd_pcm_group * 1110 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) 1111 { 1112 bool nonatomic = substream->pcm->nonatomic; 1113 struct snd_pcm_group *group; 1114 bool trylock; 1115 1116 for (;;) { 1117 if (!snd_pcm_stream_linked(substream)) 1118 return NULL; 1119 group = substream->group; 1120 /* block freeing the group object */ 1121 refcount_inc(&group->refs); 1122 1123 trylock = nonatomic ? mutex_trylock(&group->mutex) : 1124 spin_trylock(&group->lock); 1125 if (trylock) 1126 break; /* OK */ 1127 1128 /* re-lock for avoiding ABBA deadlock */ 1129 snd_pcm_stream_unlock(substream); 1130 snd_pcm_group_lock(group, nonatomic); 1131 snd_pcm_stream_lock(substream); 1132 1133 /* check the group again; the above opens a small race window */ 1134 if (substream->group == group) 1135 break; /* OK */ 1136 /* group changed, try again */ 1137 snd_pcm_group_unref(group, substream); 1138 } 1139 return group; 1140 } 1141 1142 /* 1143 * Note: call with stream lock 1144 */ 1145 static int snd_pcm_action(const struct action_ops *ops, 1146 struct snd_pcm_substream *substream, 1147 int state) 1148 { 1149 struct snd_pcm_group *group; 1150 int res; 1151 1152 group = snd_pcm_stream_group_ref(substream); 1153 if (group) 1154 res = snd_pcm_action_group(ops, substream, state, 1); 1155 else 1156 res = snd_pcm_action_single(ops, substream, state); 1157 snd_pcm_group_unref(group, substream); 1158 return res; 1159 } 1160 1161 /* 1162 * Note: don't use any locks before 1163 */ 1164 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1165 struct snd_pcm_substream *substream, 1166 int state) 1167 { 1168 int res; 1169 1170 snd_pcm_stream_lock_irq(substream); 1171 res = snd_pcm_action(ops, substream, state); 1172 snd_pcm_stream_unlock_irq(substream); 1173 return res; 1174 } 1175 1176 /* 1177 */ 1178 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1179 struct snd_pcm_substream *substream, 1180 int state) 1181 { 1182 int res; 1183 1184 /* Guarantee the group members won't change during non-atomic action */ 1185 down_read(&snd_pcm_link_rwsem); 1186 if (snd_pcm_stream_linked(substream)) 1187 res = snd_pcm_action_group(ops, substream, state, 0); 1188 else 1189 res = snd_pcm_action_single(ops, substream, state); 1190 up_read(&snd_pcm_link_rwsem); 1191 return res; 1192 } 1193 1194 /* 1195 * start callbacks 1196 */ 1197 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1198 { 1199 struct snd_pcm_runtime *runtime = substream->runtime; 1200 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1201 return -EBADFD; 1202 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1203 !snd_pcm_playback_data(substream)) 1204 return -EPIPE; 1205 runtime->trigger_tstamp_latched = false; 1206 runtime->trigger_master = substream; 1207 return 0; 1208 } 1209 1210 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1211 { 1212 if (substream->runtime->trigger_master != substream) 1213 return 0; 1214 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1215 } 1216 1217 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1218 { 1219 if (substream->runtime->trigger_master == substream) 1220 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1221 } 1222 1223 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1224 { 1225 struct snd_pcm_runtime *runtime = substream->runtime; 1226 snd_pcm_trigger_tstamp(substream); 1227 runtime->hw_ptr_jiffies = jiffies; 1228 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1229 runtime->rate; 1230 runtime->status->state = state; 1231 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1232 runtime->silence_size > 0) 1233 snd_pcm_playback_silence(substream, ULONG_MAX); 1234 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1235 } 1236 1237 static const struct action_ops snd_pcm_action_start = { 1238 .pre_action = snd_pcm_pre_start, 1239 .do_action = snd_pcm_do_start, 1240 .undo_action = snd_pcm_undo_start, 1241 .post_action = snd_pcm_post_start 1242 }; 1243 1244 /** 1245 * snd_pcm_start - start all linked streams 1246 * @substream: the PCM substream instance 1247 * 1248 * Return: Zero if successful, or a negative error code. 1249 * The stream lock must be acquired before calling this function. 1250 */ 1251 int snd_pcm_start(struct snd_pcm_substream *substream) 1252 { 1253 return snd_pcm_action(&snd_pcm_action_start, substream, 1254 SNDRV_PCM_STATE_RUNNING); 1255 } 1256 1257 /* take the stream lock and start the streams */ 1258 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1259 { 1260 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1261 SNDRV_PCM_STATE_RUNNING); 1262 } 1263 1264 /* 1265 * stop callbacks 1266 */ 1267 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1268 { 1269 struct snd_pcm_runtime *runtime = substream->runtime; 1270 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1271 return -EBADFD; 1272 runtime->trigger_master = substream; 1273 return 0; 1274 } 1275 1276 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1277 { 1278 if (substream->runtime->trigger_master == substream && 1279 snd_pcm_running(substream)) 1280 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1281 return 0; /* unconditonally stop all substreams */ 1282 } 1283 1284 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1285 { 1286 struct snd_pcm_runtime *runtime = substream->runtime; 1287 if (runtime->status->state != state) { 1288 snd_pcm_trigger_tstamp(substream); 1289 runtime->status->state = state; 1290 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1291 } 1292 wake_up(&runtime->sleep); 1293 wake_up(&runtime->tsleep); 1294 } 1295 1296 static const struct action_ops snd_pcm_action_stop = { 1297 .pre_action = snd_pcm_pre_stop, 1298 .do_action = snd_pcm_do_stop, 1299 .post_action = snd_pcm_post_stop 1300 }; 1301 1302 /** 1303 * snd_pcm_stop - try to stop all running streams in the substream group 1304 * @substream: the PCM substream instance 1305 * @state: PCM state after stopping the stream 1306 * 1307 * The state of each stream is then changed to the given state unconditionally. 1308 * 1309 * Return: Zero if successful, or a negative error code. 1310 */ 1311 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1312 { 1313 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1314 } 1315 EXPORT_SYMBOL(snd_pcm_stop); 1316 1317 /** 1318 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1319 * @substream: the PCM substream 1320 * 1321 * After stopping, the state is changed to SETUP. 1322 * Unlike snd_pcm_stop(), this affects only the given stream. 1323 * 1324 * Return: Zero if succesful, or a negative error code. 1325 */ 1326 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1327 { 1328 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1329 SNDRV_PCM_STATE_SETUP); 1330 } 1331 1332 /** 1333 * snd_pcm_stop_xrun - stop the running streams as XRUN 1334 * @substream: the PCM substream instance 1335 * 1336 * This stops the given running substream (and all linked substreams) as XRUN. 1337 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1338 * 1339 * Return: Zero if successful, or a negative error code. 1340 */ 1341 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1342 { 1343 unsigned long flags; 1344 1345 snd_pcm_stream_lock_irqsave(substream, flags); 1346 if (substream->runtime && snd_pcm_running(substream)) 1347 __snd_pcm_xrun(substream); 1348 snd_pcm_stream_unlock_irqrestore(substream, flags); 1349 return 0; 1350 } 1351 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1352 1353 /* 1354 * pause callbacks 1355 */ 1356 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1357 { 1358 struct snd_pcm_runtime *runtime = substream->runtime; 1359 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1360 return -ENOSYS; 1361 if (push) { 1362 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1363 return -EBADFD; 1364 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1365 return -EBADFD; 1366 runtime->trigger_master = substream; 1367 return 0; 1368 } 1369 1370 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1371 { 1372 if (substream->runtime->trigger_master != substream) 1373 return 0; 1374 /* some drivers might use hw_ptr to recover from the pause - 1375 update the hw_ptr now */ 1376 if (push) 1377 snd_pcm_update_hw_ptr(substream); 1378 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1379 * a delta between the current jiffies, this gives a large enough 1380 * delta, effectively to skip the check once. 1381 */ 1382 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1383 return substream->ops->trigger(substream, 1384 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1385 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1386 } 1387 1388 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1389 { 1390 if (substream->runtime->trigger_master == substream) 1391 substream->ops->trigger(substream, 1392 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1393 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1394 } 1395 1396 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1397 { 1398 struct snd_pcm_runtime *runtime = substream->runtime; 1399 snd_pcm_trigger_tstamp(substream); 1400 if (push) { 1401 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1402 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1403 wake_up(&runtime->sleep); 1404 wake_up(&runtime->tsleep); 1405 } else { 1406 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1407 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1408 } 1409 } 1410 1411 static const struct action_ops snd_pcm_action_pause = { 1412 .pre_action = snd_pcm_pre_pause, 1413 .do_action = snd_pcm_do_pause, 1414 .undo_action = snd_pcm_undo_pause, 1415 .post_action = snd_pcm_post_pause 1416 }; 1417 1418 /* 1419 * Push/release the pause for all linked streams. 1420 */ 1421 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1422 { 1423 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1424 } 1425 1426 #ifdef CONFIG_PM 1427 /* suspend */ 1428 1429 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1430 { 1431 struct snd_pcm_runtime *runtime = substream->runtime; 1432 switch (runtime->status->state) { 1433 case SNDRV_PCM_STATE_SUSPENDED: 1434 return -EBUSY; 1435 /* unresumable PCM state; return -EBUSY for skipping suspend */ 1436 case SNDRV_PCM_STATE_OPEN: 1437 case SNDRV_PCM_STATE_SETUP: 1438 case SNDRV_PCM_STATE_DISCONNECTED: 1439 return -EBUSY; 1440 } 1441 runtime->trigger_master = substream; 1442 return 0; 1443 } 1444 1445 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1446 { 1447 struct snd_pcm_runtime *runtime = substream->runtime; 1448 if (runtime->trigger_master != substream) 1449 return 0; 1450 if (! snd_pcm_running(substream)) 1451 return 0; 1452 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1453 return 0; /* suspend unconditionally */ 1454 } 1455 1456 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1457 { 1458 struct snd_pcm_runtime *runtime = substream->runtime; 1459 snd_pcm_trigger_tstamp(substream); 1460 runtime->status->suspended_state = runtime->status->state; 1461 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1462 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1463 wake_up(&runtime->sleep); 1464 wake_up(&runtime->tsleep); 1465 } 1466 1467 static const struct action_ops snd_pcm_action_suspend = { 1468 .pre_action = snd_pcm_pre_suspend, 1469 .do_action = snd_pcm_do_suspend, 1470 .post_action = snd_pcm_post_suspend 1471 }; 1472 1473 /* 1474 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1475 * @substream: the PCM substream 1476 * 1477 * After this call, all streams are changed to SUSPENDED state. 1478 * 1479 * Return: Zero if successful, or a negative error code. 1480 */ 1481 static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1482 { 1483 int err; 1484 unsigned long flags; 1485 1486 snd_pcm_stream_lock_irqsave(substream, flags); 1487 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1488 snd_pcm_stream_unlock_irqrestore(substream, flags); 1489 return err; 1490 } 1491 1492 /** 1493 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1494 * @pcm: the PCM instance 1495 * 1496 * After this call, all streams are changed to SUSPENDED state. 1497 * 1498 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1499 */ 1500 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1501 { 1502 struct snd_pcm_substream *substream; 1503 int stream, err = 0; 1504 1505 if (! pcm) 1506 return 0; 1507 1508 for (stream = 0; stream < 2; stream++) { 1509 for (substream = pcm->streams[stream].substream; 1510 substream; substream = substream->next) { 1511 /* FIXME: the open/close code should lock this as well */ 1512 if (substream->runtime == NULL) 1513 continue; 1514 1515 /* 1516 * Skip BE dai link PCM's that are internal and may 1517 * not have their substream ops set. 1518 */ 1519 if (!substream->ops) 1520 continue; 1521 1522 err = snd_pcm_suspend(substream); 1523 if (err < 0 && err != -EBUSY) 1524 return err; 1525 } 1526 } 1527 return 0; 1528 } 1529 EXPORT_SYMBOL(snd_pcm_suspend_all); 1530 1531 /* resume */ 1532 1533 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1534 { 1535 struct snd_pcm_runtime *runtime = substream->runtime; 1536 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1537 return -ENOSYS; 1538 runtime->trigger_master = substream; 1539 return 0; 1540 } 1541 1542 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1543 { 1544 struct snd_pcm_runtime *runtime = substream->runtime; 1545 if (runtime->trigger_master != substream) 1546 return 0; 1547 /* DMA not running previously? */ 1548 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1549 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1550 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1551 return 0; 1552 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1553 } 1554 1555 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1556 { 1557 if (substream->runtime->trigger_master == substream && 1558 snd_pcm_running(substream)) 1559 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1560 } 1561 1562 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1563 { 1564 struct snd_pcm_runtime *runtime = substream->runtime; 1565 snd_pcm_trigger_tstamp(substream); 1566 runtime->status->state = runtime->status->suspended_state; 1567 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1568 } 1569 1570 static const struct action_ops snd_pcm_action_resume = { 1571 .pre_action = snd_pcm_pre_resume, 1572 .do_action = snd_pcm_do_resume, 1573 .undo_action = snd_pcm_undo_resume, 1574 .post_action = snd_pcm_post_resume 1575 }; 1576 1577 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1578 { 1579 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1580 } 1581 1582 #else 1583 1584 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1585 { 1586 return -ENOSYS; 1587 } 1588 1589 #endif /* CONFIG_PM */ 1590 1591 /* 1592 * xrun ioctl 1593 * 1594 * Change the RUNNING stream(s) to XRUN state. 1595 */ 1596 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1597 { 1598 struct snd_pcm_runtime *runtime = substream->runtime; 1599 int result; 1600 1601 snd_pcm_stream_lock_irq(substream); 1602 switch (runtime->status->state) { 1603 case SNDRV_PCM_STATE_XRUN: 1604 result = 0; /* already there */ 1605 break; 1606 case SNDRV_PCM_STATE_RUNNING: 1607 __snd_pcm_xrun(substream); 1608 result = 0; 1609 break; 1610 default: 1611 result = -EBADFD; 1612 } 1613 snd_pcm_stream_unlock_irq(substream); 1614 return result; 1615 } 1616 1617 /* 1618 * reset ioctl 1619 */ 1620 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1621 { 1622 struct snd_pcm_runtime *runtime = substream->runtime; 1623 switch (runtime->status->state) { 1624 case SNDRV_PCM_STATE_RUNNING: 1625 case SNDRV_PCM_STATE_PREPARED: 1626 case SNDRV_PCM_STATE_PAUSED: 1627 case SNDRV_PCM_STATE_SUSPENDED: 1628 return 0; 1629 default: 1630 return -EBADFD; 1631 } 1632 } 1633 1634 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1635 { 1636 struct snd_pcm_runtime *runtime = substream->runtime; 1637 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1638 if (err < 0) 1639 return err; 1640 runtime->hw_ptr_base = 0; 1641 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1642 runtime->status->hw_ptr % runtime->period_size; 1643 runtime->silence_start = runtime->status->hw_ptr; 1644 runtime->silence_filled = 0; 1645 return 0; 1646 } 1647 1648 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1649 { 1650 struct snd_pcm_runtime *runtime = substream->runtime; 1651 runtime->control->appl_ptr = runtime->status->hw_ptr; 1652 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1653 runtime->silence_size > 0) 1654 snd_pcm_playback_silence(substream, ULONG_MAX); 1655 } 1656 1657 static const struct action_ops snd_pcm_action_reset = { 1658 .pre_action = snd_pcm_pre_reset, 1659 .do_action = snd_pcm_do_reset, 1660 .post_action = snd_pcm_post_reset 1661 }; 1662 1663 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1664 { 1665 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1666 } 1667 1668 /* 1669 * prepare ioctl 1670 */ 1671 /* we use the second argument for updating f_flags */ 1672 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1673 int f_flags) 1674 { 1675 struct snd_pcm_runtime *runtime = substream->runtime; 1676 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1677 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1678 return -EBADFD; 1679 if (snd_pcm_running(substream)) 1680 return -EBUSY; 1681 substream->f_flags = f_flags; 1682 return 0; 1683 } 1684 1685 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1686 { 1687 int err; 1688 err = substream->ops->prepare(substream); 1689 if (err < 0) 1690 return err; 1691 return snd_pcm_do_reset(substream, 0); 1692 } 1693 1694 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1695 { 1696 struct snd_pcm_runtime *runtime = substream->runtime; 1697 runtime->control->appl_ptr = runtime->status->hw_ptr; 1698 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1699 } 1700 1701 static const struct action_ops snd_pcm_action_prepare = { 1702 .pre_action = snd_pcm_pre_prepare, 1703 .do_action = snd_pcm_do_prepare, 1704 .post_action = snd_pcm_post_prepare 1705 }; 1706 1707 /** 1708 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1709 * @substream: the PCM substream instance 1710 * @file: file to refer f_flags 1711 * 1712 * Return: Zero if successful, or a negative error code. 1713 */ 1714 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1715 struct file *file) 1716 { 1717 int f_flags; 1718 1719 if (file) 1720 f_flags = file->f_flags; 1721 else 1722 f_flags = substream->f_flags; 1723 1724 snd_pcm_stream_lock_irq(substream); 1725 switch (substream->runtime->status->state) { 1726 case SNDRV_PCM_STATE_PAUSED: 1727 snd_pcm_pause(substream, 0); 1728 /* fallthru */ 1729 case SNDRV_PCM_STATE_SUSPENDED: 1730 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1731 break; 1732 } 1733 snd_pcm_stream_unlock_irq(substream); 1734 1735 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1736 substream, f_flags); 1737 } 1738 1739 /* 1740 * drain ioctl 1741 */ 1742 1743 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1744 { 1745 struct snd_pcm_runtime *runtime = substream->runtime; 1746 switch (runtime->status->state) { 1747 case SNDRV_PCM_STATE_OPEN: 1748 case SNDRV_PCM_STATE_DISCONNECTED: 1749 case SNDRV_PCM_STATE_SUSPENDED: 1750 return -EBADFD; 1751 } 1752 runtime->trigger_master = substream; 1753 return 0; 1754 } 1755 1756 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1757 { 1758 struct snd_pcm_runtime *runtime = substream->runtime; 1759 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1760 switch (runtime->status->state) { 1761 case SNDRV_PCM_STATE_PREPARED: 1762 /* start playback stream if possible */ 1763 if (! snd_pcm_playback_empty(substream)) { 1764 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1765 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1766 } else { 1767 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1768 } 1769 break; 1770 case SNDRV_PCM_STATE_RUNNING: 1771 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1772 break; 1773 case SNDRV_PCM_STATE_XRUN: 1774 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1775 break; 1776 default: 1777 break; 1778 } 1779 } else { 1780 /* stop running stream */ 1781 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1782 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1783 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1784 snd_pcm_do_stop(substream, new_state); 1785 snd_pcm_post_stop(substream, new_state); 1786 } 1787 } 1788 1789 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1790 runtime->trigger_master == substream && 1791 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1792 return substream->ops->trigger(substream, 1793 SNDRV_PCM_TRIGGER_DRAIN); 1794 1795 return 0; 1796 } 1797 1798 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1799 { 1800 } 1801 1802 static const struct action_ops snd_pcm_action_drain_init = { 1803 .pre_action = snd_pcm_pre_drain_init, 1804 .do_action = snd_pcm_do_drain_init, 1805 .post_action = snd_pcm_post_drain_init 1806 }; 1807 1808 /* 1809 * Drain the stream(s). 1810 * When the substream is linked, sync until the draining of all playback streams 1811 * is finished. 1812 * After this call, all streams are supposed to be either SETUP or DRAINING 1813 * (capture only) state. 1814 */ 1815 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1816 struct file *file) 1817 { 1818 struct snd_card *card; 1819 struct snd_pcm_runtime *runtime; 1820 struct snd_pcm_substream *s; 1821 struct snd_pcm_group *group; 1822 wait_queue_entry_t wait; 1823 int result = 0; 1824 int nonblock = 0; 1825 1826 card = substream->pcm->card; 1827 runtime = substream->runtime; 1828 1829 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1830 return -EBADFD; 1831 1832 if (file) { 1833 if (file->f_flags & O_NONBLOCK) 1834 nonblock = 1; 1835 } else if (substream->f_flags & O_NONBLOCK) 1836 nonblock = 1; 1837 1838 snd_pcm_stream_lock_irq(substream); 1839 /* resume pause */ 1840 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1841 snd_pcm_pause(substream, 0); 1842 1843 /* pre-start/stop - all running streams are changed to DRAINING state */ 1844 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1845 if (result < 0) 1846 goto unlock; 1847 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1848 if (nonblock) { 1849 result = -EAGAIN; 1850 goto unlock; 1851 } 1852 1853 for (;;) { 1854 long tout; 1855 struct snd_pcm_runtime *to_check; 1856 if (signal_pending(current)) { 1857 result = -ERESTARTSYS; 1858 break; 1859 } 1860 /* find a substream to drain */ 1861 to_check = NULL; 1862 group = snd_pcm_stream_group_ref(substream); 1863 snd_pcm_group_for_each_entry(s, substream) { 1864 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1865 continue; 1866 runtime = s->runtime; 1867 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1868 to_check = runtime; 1869 break; 1870 } 1871 } 1872 snd_pcm_group_unref(group, substream); 1873 if (!to_check) 1874 break; /* all drained */ 1875 init_waitqueue_entry(&wait, current); 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_interruptible(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 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