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 set_current_state(TASK_INTERRUPTIBLE); 1877 add_wait_queue(&to_check->sleep, &wait); 1878 snd_pcm_stream_unlock_irq(substream); 1879 if (runtime->no_period_wakeup) 1880 tout = MAX_SCHEDULE_TIMEOUT; 1881 else { 1882 tout = 10; 1883 if (runtime->rate) { 1884 long t = runtime->period_size * 2 / runtime->rate; 1885 tout = max(t, tout); 1886 } 1887 tout = msecs_to_jiffies(tout * 1000); 1888 } 1889 tout = schedule_timeout(tout); 1890 1891 snd_pcm_stream_lock_irq(substream); 1892 group = snd_pcm_stream_group_ref(substream); 1893 snd_pcm_group_for_each_entry(s, substream) { 1894 if (s->runtime == to_check) { 1895 remove_wait_queue(&to_check->sleep, &wait); 1896 break; 1897 } 1898 } 1899 snd_pcm_group_unref(group, substream); 1900 1901 if (card->shutdown) { 1902 result = -ENODEV; 1903 break; 1904 } 1905 if (tout == 0) { 1906 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1907 result = -ESTRPIPE; 1908 else { 1909 dev_dbg(substream->pcm->card->dev, 1910 "playback drain error (DMA or IRQ trouble?)\n"); 1911 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1912 result = -EIO; 1913 } 1914 break; 1915 } 1916 } 1917 1918 unlock: 1919 snd_pcm_stream_unlock_irq(substream); 1920 1921 return result; 1922 } 1923 1924 /* 1925 * drop ioctl 1926 * 1927 * Immediately put all linked substreams into SETUP state. 1928 */ 1929 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1930 { 1931 struct snd_pcm_runtime *runtime; 1932 int result = 0; 1933 1934 if (PCM_RUNTIME_CHECK(substream)) 1935 return -ENXIO; 1936 runtime = substream->runtime; 1937 1938 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1939 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1940 return -EBADFD; 1941 1942 snd_pcm_stream_lock_irq(substream); 1943 /* resume pause */ 1944 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1945 snd_pcm_pause(substream, 0); 1946 1947 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1948 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1949 snd_pcm_stream_unlock_irq(substream); 1950 1951 return result; 1952 } 1953 1954 1955 static bool is_pcm_file(struct file *file) 1956 { 1957 struct inode *inode = file_inode(file); 1958 struct snd_pcm *pcm; 1959 unsigned int minor; 1960 1961 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1962 return false; 1963 minor = iminor(inode); 1964 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 1965 if (!pcm) 1966 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1967 if (!pcm) 1968 return false; 1969 snd_card_unref(pcm->card); 1970 return true; 1971 } 1972 1973 /* 1974 * PCM link handling 1975 */ 1976 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1977 { 1978 int res = 0; 1979 struct snd_pcm_file *pcm_file; 1980 struct snd_pcm_substream *substream1; 1981 struct snd_pcm_group *group, *target_group; 1982 bool nonatomic = substream->pcm->nonatomic; 1983 struct fd f = fdget(fd); 1984 1985 if (!f.file) 1986 return -EBADFD; 1987 if (!is_pcm_file(f.file)) { 1988 res = -EBADFD; 1989 goto _badf; 1990 } 1991 pcm_file = f.file->private_data; 1992 substream1 = pcm_file->substream; 1993 group = kzalloc(sizeof(*group), GFP_KERNEL); 1994 if (!group) { 1995 res = -ENOMEM; 1996 goto _nolock; 1997 } 1998 snd_pcm_group_init(group); 1999 2000 down_write(&snd_pcm_link_rwsem); 2001 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 2002 substream->runtime->status->state != substream1->runtime->status->state || 2003 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2004 res = -EBADFD; 2005 goto _end; 2006 } 2007 if (snd_pcm_stream_linked(substream1)) { 2008 res = -EALREADY; 2009 goto _end; 2010 } 2011 2012 snd_pcm_stream_lock_irq(substream); 2013 if (!snd_pcm_stream_linked(substream)) { 2014 snd_pcm_group_assign(substream, group); 2015 group = NULL; /* assigned, don't free this one below */ 2016 } 2017 target_group = substream->group; 2018 snd_pcm_stream_unlock_irq(substream); 2019 2020 snd_pcm_group_lock_irq(target_group, nonatomic); 2021 snd_pcm_stream_lock(substream1); 2022 snd_pcm_group_assign(substream1, target_group); 2023 refcount_inc(&target_group->refs); 2024 snd_pcm_stream_unlock(substream1); 2025 snd_pcm_group_unlock_irq(target_group, nonatomic); 2026 _end: 2027 up_write(&snd_pcm_link_rwsem); 2028 _nolock: 2029 kfree(group); 2030 _badf: 2031 fdput(f); 2032 return res; 2033 } 2034 2035 static void relink_to_local(struct snd_pcm_substream *substream) 2036 { 2037 snd_pcm_stream_lock(substream); 2038 snd_pcm_group_assign(substream, &substream->self_group); 2039 snd_pcm_stream_unlock(substream); 2040 } 2041 2042 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2043 { 2044 struct snd_pcm_group *group; 2045 bool nonatomic = substream->pcm->nonatomic; 2046 bool do_free = false; 2047 int res = 0; 2048 2049 down_write(&snd_pcm_link_rwsem); 2050 2051 if (!snd_pcm_stream_linked(substream)) { 2052 res = -EALREADY; 2053 goto _end; 2054 } 2055 2056 group = substream->group; 2057 snd_pcm_group_lock_irq(group, nonatomic); 2058 2059 relink_to_local(substream); 2060 refcount_dec(&group->refs); 2061 2062 /* detach the last stream, too */ 2063 if (list_is_singular(&group->substreams)) { 2064 relink_to_local(list_first_entry(&group->substreams, 2065 struct snd_pcm_substream, 2066 link_list)); 2067 do_free = refcount_dec_and_test(&group->refs); 2068 } 2069 2070 snd_pcm_group_unlock_irq(group, nonatomic); 2071 if (do_free) 2072 kfree(group); 2073 2074 _end: 2075 up_write(&snd_pcm_link_rwsem); 2076 return res; 2077 } 2078 2079 /* 2080 * hw configurator 2081 */ 2082 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2083 struct snd_pcm_hw_rule *rule) 2084 { 2085 struct snd_interval t; 2086 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2087 hw_param_interval_c(params, rule->deps[1]), &t); 2088 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2089 } 2090 2091 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2092 struct snd_pcm_hw_rule *rule) 2093 { 2094 struct snd_interval t; 2095 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2096 hw_param_interval_c(params, rule->deps[1]), &t); 2097 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2098 } 2099 2100 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2101 struct snd_pcm_hw_rule *rule) 2102 { 2103 struct snd_interval t; 2104 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2105 hw_param_interval_c(params, rule->deps[1]), 2106 (unsigned long) rule->private, &t); 2107 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2108 } 2109 2110 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2111 struct snd_pcm_hw_rule *rule) 2112 { 2113 struct snd_interval t; 2114 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2115 (unsigned long) rule->private, 2116 hw_param_interval_c(params, rule->deps[1]), &t); 2117 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2118 } 2119 2120 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2121 struct snd_pcm_hw_rule *rule) 2122 { 2123 unsigned int k; 2124 const struct snd_interval *i = 2125 hw_param_interval_c(params, rule->deps[0]); 2126 struct snd_mask m; 2127 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2128 snd_mask_any(&m); 2129 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2130 int bits; 2131 if (! snd_mask_test(mask, k)) 2132 continue; 2133 bits = snd_pcm_format_physical_width(k); 2134 if (bits <= 0) 2135 continue; /* ignore invalid formats */ 2136 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2137 snd_mask_reset(&m, k); 2138 } 2139 return snd_mask_refine(mask, &m); 2140 } 2141 2142 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2143 struct snd_pcm_hw_rule *rule) 2144 { 2145 struct snd_interval t; 2146 unsigned int k; 2147 t.min = UINT_MAX; 2148 t.max = 0; 2149 t.openmin = 0; 2150 t.openmax = 0; 2151 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2152 int bits; 2153 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2154 continue; 2155 bits = snd_pcm_format_physical_width(k); 2156 if (bits <= 0) 2157 continue; /* ignore invalid formats */ 2158 if (t.min > (unsigned)bits) 2159 t.min = bits; 2160 if (t.max < (unsigned)bits) 2161 t.max = bits; 2162 } 2163 t.integer = 1; 2164 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2165 } 2166 2167 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2168 #error "Change this table" 2169 #endif 2170 2171 static const unsigned int rates[] = { 2172 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2173 48000, 64000, 88200, 96000, 176400, 192000 2174 }; 2175 2176 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2177 .count = ARRAY_SIZE(rates), 2178 .list = rates, 2179 }; 2180 2181 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2182 struct snd_pcm_hw_rule *rule) 2183 { 2184 struct snd_pcm_hardware *hw = rule->private; 2185 return snd_interval_list(hw_param_interval(params, rule->var), 2186 snd_pcm_known_rates.count, 2187 snd_pcm_known_rates.list, hw->rates); 2188 } 2189 2190 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2191 struct snd_pcm_hw_rule *rule) 2192 { 2193 struct snd_interval t; 2194 struct snd_pcm_substream *substream = rule->private; 2195 t.min = 0; 2196 t.max = substream->buffer_bytes_max; 2197 t.openmin = 0; 2198 t.openmax = 0; 2199 t.integer = 1; 2200 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2201 } 2202 2203 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2204 { 2205 struct snd_pcm_runtime *runtime = substream->runtime; 2206 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2207 int k, err; 2208 2209 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2210 snd_mask_any(constrs_mask(constrs, k)); 2211 } 2212 2213 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2214 snd_interval_any(constrs_interval(constrs, k)); 2215 } 2216 2217 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2218 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2219 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2220 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2221 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2222 2223 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2224 snd_pcm_hw_rule_format, NULL, 2225 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2226 if (err < 0) 2227 return err; 2228 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2229 snd_pcm_hw_rule_sample_bits, NULL, 2230 SNDRV_PCM_HW_PARAM_FORMAT, 2231 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2232 if (err < 0) 2233 return err; 2234 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2235 snd_pcm_hw_rule_div, NULL, 2236 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2237 if (err < 0) 2238 return err; 2239 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2240 snd_pcm_hw_rule_mul, NULL, 2241 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2242 if (err < 0) 2243 return err; 2244 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2245 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2246 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2247 if (err < 0) 2248 return err; 2249 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2250 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2251 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2252 if (err < 0) 2253 return err; 2254 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2255 snd_pcm_hw_rule_div, NULL, 2256 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2257 if (err < 0) 2258 return err; 2259 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2260 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2261 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2262 if (err < 0) 2263 return err; 2264 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2265 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2266 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2267 if (err < 0) 2268 return err; 2269 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2270 snd_pcm_hw_rule_div, NULL, 2271 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2272 if (err < 0) 2273 return err; 2274 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2275 snd_pcm_hw_rule_div, NULL, 2276 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2277 if (err < 0) 2278 return err; 2279 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2280 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2281 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2282 if (err < 0) 2283 return err; 2284 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2285 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2286 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2287 if (err < 0) 2288 return err; 2289 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2290 snd_pcm_hw_rule_mul, NULL, 2291 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2292 if (err < 0) 2293 return err; 2294 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2295 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2296 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2297 if (err < 0) 2298 return err; 2299 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2300 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2301 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2302 if (err < 0) 2303 return err; 2304 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2305 snd_pcm_hw_rule_muldivk, (void*) 8, 2306 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2307 if (err < 0) 2308 return err; 2309 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2310 snd_pcm_hw_rule_muldivk, (void*) 8, 2311 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2312 if (err < 0) 2313 return err; 2314 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2315 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2316 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2317 if (err < 0) 2318 return err; 2319 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2320 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2321 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2322 if (err < 0) 2323 return err; 2324 return 0; 2325 } 2326 2327 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2328 { 2329 struct snd_pcm_runtime *runtime = substream->runtime; 2330 struct snd_pcm_hardware *hw = &runtime->hw; 2331 int err; 2332 unsigned int mask = 0; 2333 2334 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2335 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2336 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2337 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2338 if (hw_support_mmap(substream)) { 2339 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2340 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2341 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2342 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2343 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2344 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2345 } 2346 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2347 if (err < 0) 2348 return err; 2349 2350 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2351 if (err < 0) 2352 return err; 2353 2354 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2355 if (err < 0) 2356 return err; 2357 2358 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2359 hw->channels_min, hw->channels_max); 2360 if (err < 0) 2361 return err; 2362 2363 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2364 hw->rate_min, hw->rate_max); 2365 if (err < 0) 2366 return err; 2367 2368 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2369 hw->period_bytes_min, hw->period_bytes_max); 2370 if (err < 0) 2371 return err; 2372 2373 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2374 hw->periods_min, hw->periods_max); 2375 if (err < 0) 2376 return err; 2377 2378 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2379 hw->period_bytes_min, hw->buffer_bytes_max); 2380 if (err < 0) 2381 return err; 2382 2383 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2384 snd_pcm_hw_rule_buffer_bytes_max, substream, 2385 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2386 if (err < 0) 2387 return err; 2388 2389 /* FIXME: remove */ 2390 if (runtime->dma_bytes) { 2391 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2392 if (err < 0) 2393 return err; 2394 } 2395 2396 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2397 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2398 snd_pcm_hw_rule_rate, hw, 2399 SNDRV_PCM_HW_PARAM_RATE, -1); 2400 if (err < 0) 2401 return err; 2402 } 2403 2404 /* FIXME: this belong to lowlevel */ 2405 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2406 2407 return 0; 2408 } 2409 2410 static void pcm_release_private(struct snd_pcm_substream *substream) 2411 { 2412 if (snd_pcm_stream_linked(substream)) 2413 snd_pcm_unlink(substream); 2414 } 2415 2416 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2417 { 2418 substream->ref_count--; 2419 if (substream->ref_count > 0) 2420 return; 2421 2422 snd_pcm_drop(substream); 2423 if (substream->hw_opened) { 2424 if (substream->ops->hw_free && 2425 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2426 substream->ops->hw_free(substream); 2427 substream->ops->close(substream); 2428 substream->hw_opened = 0; 2429 } 2430 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2431 pm_qos_remove_request(&substream->latency_pm_qos_req); 2432 if (substream->pcm_release) { 2433 substream->pcm_release(substream); 2434 substream->pcm_release = NULL; 2435 } 2436 snd_pcm_detach_substream(substream); 2437 } 2438 EXPORT_SYMBOL(snd_pcm_release_substream); 2439 2440 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2441 struct file *file, 2442 struct snd_pcm_substream **rsubstream) 2443 { 2444 struct snd_pcm_substream *substream; 2445 int err; 2446 2447 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2448 if (err < 0) 2449 return err; 2450 if (substream->ref_count > 1) { 2451 *rsubstream = substream; 2452 return 0; 2453 } 2454 2455 err = snd_pcm_hw_constraints_init(substream); 2456 if (err < 0) { 2457 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2458 goto error; 2459 } 2460 2461 if ((err = substream->ops->open(substream)) < 0) 2462 goto error; 2463 2464 substream->hw_opened = 1; 2465 2466 err = snd_pcm_hw_constraints_complete(substream); 2467 if (err < 0) { 2468 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2469 goto error; 2470 } 2471 2472 *rsubstream = substream; 2473 return 0; 2474 2475 error: 2476 snd_pcm_release_substream(substream); 2477 return err; 2478 } 2479 EXPORT_SYMBOL(snd_pcm_open_substream); 2480 2481 static int snd_pcm_open_file(struct file *file, 2482 struct snd_pcm *pcm, 2483 int stream) 2484 { 2485 struct snd_pcm_file *pcm_file; 2486 struct snd_pcm_substream *substream; 2487 int err; 2488 2489 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2490 if (err < 0) 2491 return err; 2492 2493 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2494 if (pcm_file == NULL) { 2495 snd_pcm_release_substream(substream); 2496 return -ENOMEM; 2497 } 2498 pcm_file->substream = substream; 2499 if (substream->ref_count == 1) 2500 substream->pcm_release = pcm_release_private; 2501 file->private_data = pcm_file; 2502 2503 return 0; 2504 } 2505 2506 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2507 { 2508 struct snd_pcm *pcm; 2509 int err = nonseekable_open(inode, file); 2510 if (err < 0) 2511 return err; 2512 pcm = snd_lookup_minor_data(iminor(inode), 2513 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2514 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2515 if (pcm) 2516 snd_card_unref(pcm->card); 2517 return err; 2518 } 2519 2520 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2521 { 2522 struct snd_pcm *pcm; 2523 int err = nonseekable_open(inode, file); 2524 if (err < 0) 2525 return err; 2526 pcm = snd_lookup_minor_data(iminor(inode), 2527 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2528 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2529 if (pcm) 2530 snd_card_unref(pcm->card); 2531 return err; 2532 } 2533 2534 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2535 { 2536 int err; 2537 wait_queue_entry_t wait; 2538 2539 if (pcm == NULL) { 2540 err = -ENODEV; 2541 goto __error1; 2542 } 2543 err = snd_card_file_add(pcm->card, file); 2544 if (err < 0) 2545 goto __error1; 2546 if (!try_module_get(pcm->card->module)) { 2547 err = -EFAULT; 2548 goto __error2; 2549 } 2550 init_waitqueue_entry(&wait, current); 2551 add_wait_queue(&pcm->open_wait, &wait); 2552 mutex_lock(&pcm->open_mutex); 2553 while (1) { 2554 err = snd_pcm_open_file(file, pcm, stream); 2555 if (err >= 0) 2556 break; 2557 if (err == -EAGAIN) { 2558 if (file->f_flags & O_NONBLOCK) { 2559 err = -EBUSY; 2560 break; 2561 } 2562 } else 2563 break; 2564 set_current_state(TASK_INTERRUPTIBLE); 2565 mutex_unlock(&pcm->open_mutex); 2566 schedule(); 2567 mutex_lock(&pcm->open_mutex); 2568 if (pcm->card->shutdown) { 2569 err = -ENODEV; 2570 break; 2571 } 2572 if (signal_pending(current)) { 2573 err = -ERESTARTSYS; 2574 break; 2575 } 2576 } 2577 remove_wait_queue(&pcm->open_wait, &wait); 2578 mutex_unlock(&pcm->open_mutex); 2579 if (err < 0) 2580 goto __error; 2581 return err; 2582 2583 __error: 2584 module_put(pcm->card->module); 2585 __error2: 2586 snd_card_file_remove(pcm->card, file); 2587 __error1: 2588 return err; 2589 } 2590 2591 static int snd_pcm_release(struct inode *inode, struct file *file) 2592 { 2593 struct snd_pcm *pcm; 2594 struct snd_pcm_substream *substream; 2595 struct snd_pcm_file *pcm_file; 2596 2597 pcm_file = file->private_data; 2598 substream = pcm_file->substream; 2599 if (snd_BUG_ON(!substream)) 2600 return -ENXIO; 2601 pcm = substream->pcm; 2602 mutex_lock(&pcm->open_mutex); 2603 snd_pcm_release_substream(substream); 2604 kfree(pcm_file); 2605 mutex_unlock(&pcm->open_mutex); 2606 wake_up(&pcm->open_wait); 2607 module_put(pcm->card->module); 2608 snd_card_file_remove(pcm->card, file); 2609 return 0; 2610 } 2611 2612 /* check and update PCM state; return 0 or a negative error 2613 * call this inside PCM lock 2614 */ 2615 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2616 { 2617 switch (substream->runtime->status->state) { 2618 case SNDRV_PCM_STATE_DRAINING: 2619 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2620 return -EBADFD; 2621 /* Fall through */ 2622 case SNDRV_PCM_STATE_RUNNING: 2623 return snd_pcm_update_hw_ptr(substream); 2624 case SNDRV_PCM_STATE_PREPARED: 2625 case SNDRV_PCM_STATE_PAUSED: 2626 return 0; 2627 case SNDRV_PCM_STATE_SUSPENDED: 2628 return -ESTRPIPE; 2629 case SNDRV_PCM_STATE_XRUN: 2630 return -EPIPE; 2631 default: 2632 return -EBADFD; 2633 } 2634 } 2635 2636 /* increase the appl_ptr; returns the processed frames or a negative error */ 2637 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2638 snd_pcm_uframes_t frames, 2639 snd_pcm_sframes_t avail) 2640 { 2641 struct snd_pcm_runtime *runtime = substream->runtime; 2642 snd_pcm_sframes_t appl_ptr; 2643 int ret; 2644 2645 if (avail <= 0) 2646 return 0; 2647 if (frames > (snd_pcm_uframes_t)avail) 2648 frames = avail; 2649 appl_ptr = runtime->control->appl_ptr + frames; 2650 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2651 appl_ptr -= runtime->boundary; 2652 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2653 return ret < 0 ? ret : frames; 2654 } 2655 2656 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2657 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2658 snd_pcm_uframes_t frames, 2659 snd_pcm_sframes_t avail) 2660 { 2661 struct snd_pcm_runtime *runtime = substream->runtime; 2662 snd_pcm_sframes_t appl_ptr; 2663 int ret; 2664 2665 if (avail <= 0) 2666 return 0; 2667 if (frames > (snd_pcm_uframes_t)avail) 2668 frames = avail; 2669 appl_ptr = runtime->control->appl_ptr - frames; 2670 if (appl_ptr < 0) 2671 appl_ptr += runtime->boundary; 2672 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2673 /* NOTE: we return zero for errors because PulseAudio gets depressed 2674 * upon receiving an error from rewind ioctl and stops processing 2675 * any longer. Returning zero means that no rewind is done, so 2676 * it's not absolutely wrong to answer like that. 2677 */ 2678 return ret < 0 ? 0 : frames; 2679 } 2680 2681 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2682 snd_pcm_uframes_t frames) 2683 { 2684 snd_pcm_sframes_t ret; 2685 2686 if (frames == 0) 2687 return 0; 2688 2689 snd_pcm_stream_lock_irq(substream); 2690 ret = do_pcm_hwsync(substream); 2691 if (!ret) 2692 ret = rewind_appl_ptr(substream, frames, 2693 snd_pcm_hw_avail(substream)); 2694 snd_pcm_stream_unlock_irq(substream); 2695 return ret; 2696 } 2697 2698 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2699 snd_pcm_uframes_t frames) 2700 { 2701 snd_pcm_sframes_t ret; 2702 2703 if (frames == 0) 2704 return 0; 2705 2706 snd_pcm_stream_lock_irq(substream); 2707 ret = do_pcm_hwsync(substream); 2708 if (!ret) 2709 ret = forward_appl_ptr(substream, frames, 2710 snd_pcm_avail(substream)); 2711 snd_pcm_stream_unlock_irq(substream); 2712 return ret; 2713 } 2714 2715 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2716 { 2717 int err; 2718 2719 snd_pcm_stream_lock_irq(substream); 2720 err = do_pcm_hwsync(substream); 2721 snd_pcm_stream_unlock_irq(substream); 2722 return err; 2723 } 2724 2725 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2726 snd_pcm_sframes_t *delay) 2727 { 2728 int err; 2729 snd_pcm_sframes_t n = 0; 2730 2731 snd_pcm_stream_lock_irq(substream); 2732 err = do_pcm_hwsync(substream); 2733 if (!err) 2734 n = snd_pcm_calc_delay(substream); 2735 snd_pcm_stream_unlock_irq(substream); 2736 if (!err) 2737 *delay = n; 2738 return err; 2739 } 2740 2741 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2742 struct snd_pcm_sync_ptr __user *_sync_ptr) 2743 { 2744 struct snd_pcm_runtime *runtime = substream->runtime; 2745 struct snd_pcm_sync_ptr sync_ptr; 2746 volatile struct snd_pcm_mmap_status *status; 2747 volatile struct snd_pcm_mmap_control *control; 2748 int err; 2749 2750 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2751 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2752 return -EFAULT; 2753 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2754 return -EFAULT; 2755 status = runtime->status; 2756 control = runtime->control; 2757 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2758 err = snd_pcm_hwsync(substream); 2759 if (err < 0) 2760 return err; 2761 } 2762 snd_pcm_stream_lock_irq(substream); 2763 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2764 err = pcm_lib_apply_appl_ptr(substream, 2765 sync_ptr.c.control.appl_ptr); 2766 if (err < 0) { 2767 snd_pcm_stream_unlock_irq(substream); 2768 return err; 2769 } 2770 } else { 2771 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2772 } 2773 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2774 control->avail_min = sync_ptr.c.control.avail_min; 2775 else 2776 sync_ptr.c.control.avail_min = control->avail_min; 2777 sync_ptr.s.status.state = status->state; 2778 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2779 sync_ptr.s.status.tstamp = status->tstamp; 2780 sync_ptr.s.status.suspended_state = status->suspended_state; 2781 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2782 snd_pcm_stream_unlock_irq(substream); 2783 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2784 return -EFAULT; 2785 return 0; 2786 } 2787 2788 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2789 { 2790 struct snd_pcm_runtime *runtime = substream->runtime; 2791 int arg; 2792 2793 if (get_user(arg, _arg)) 2794 return -EFAULT; 2795 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2796 return -EINVAL; 2797 runtime->tstamp_type = arg; 2798 return 0; 2799 } 2800 2801 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2802 struct snd_xferi __user *_xferi) 2803 { 2804 struct snd_xferi xferi; 2805 struct snd_pcm_runtime *runtime = substream->runtime; 2806 snd_pcm_sframes_t result; 2807 2808 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2809 return -EBADFD; 2810 if (put_user(0, &_xferi->result)) 2811 return -EFAULT; 2812 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2813 return -EFAULT; 2814 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2815 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2816 else 2817 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2818 __put_user(result, &_xferi->result); 2819 return result < 0 ? result : 0; 2820 } 2821 2822 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2823 struct snd_xfern __user *_xfern) 2824 { 2825 struct snd_xfern xfern; 2826 struct snd_pcm_runtime *runtime = substream->runtime; 2827 void *bufs; 2828 snd_pcm_sframes_t result; 2829 2830 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2831 return -EBADFD; 2832 if (runtime->channels > 128) 2833 return -EINVAL; 2834 if (put_user(0, &_xfern->result)) 2835 return -EFAULT; 2836 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2837 return -EFAULT; 2838 2839 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2840 if (IS_ERR(bufs)) 2841 return PTR_ERR(bufs); 2842 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2843 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2844 else 2845 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2846 kfree(bufs); 2847 __put_user(result, &_xfern->result); 2848 return result < 0 ? result : 0; 2849 } 2850 2851 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2852 snd_pcm_uframes_t __user *_frames) 2853 { 2854 snd_pcm_uframes_t frames; 2855 snd_pcm_sframes_t result; 2856 2857 if (get_user(frames, _frames)) 2858 return -EFAULT; 2859 if (put_user(0, _frames)) 2860 return -EFAULT; 2861 result = snd_pcm_rewind(substream, frames); 2862 __put_user(result, _frames); 2863 return result < 0 ? result : 0; 2864 } 2865 2866 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2867 snd_pcm_uframes_t __user *_frames) 2868 { 2869 snd_pcm_uframes_t frames; 2870 snd_pcm_sframes_t result; 2871 2872 if (get_user(frames, _frames)) 2873 return -EFAULT; 2874 if (put_user(0, _frames)) 2875 return -EFAULT; 2876 result = snd_pcm_forward(substream, frames); 2877 __put_user(result, _frames); 2878 return result < 0 ? result : 0; 2879 } 2880 2881 static int snd_pcm_common_ioctl(struct file *file, 2882 struct snd_pcm_substream *substream, 2883 unsigned int cmd, void __user *arg) 2884 { 2885 struct snd_pcm_file *pcm_file = file->private_data; 2886 int res; 2887 2888 if (PCM_RUNTIME_CHECK(substream)) 2889 return -ENXIO; 2890 2891 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2892 if (res < 0) 2893 return res; 2894 2895 switch (cmd) { 2896 case SNDRV_PCM_IOCTL_PVERSION: 2897 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2898 case SNDRV_PCM_IOCTL_INFO: 2899 return snd_pcm_info_user(substream, arg); 2900 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2901 return 0; 2902 case SNDRV_PCM_IOCTL_TTSTAMP: 2903 return snd_pcm_tstamp(substream, arg); 2904 case SNDRV_PCM_IOCTL_USER_PVERSION: 2905 if (get_user(pcm_file->user_pversion, 2906 (unsigned int __user *)arg)) 2907 return -EFAULT; 2908 return 0; 2909 case SNDRV_PCM_IOCTL_HW_REFINE: 2910 return snd_pcm_hw_refine_user(substream, arg); 2911 case SNDRV_PCM_IOCTL_HW_PARAMS: 2912 return snd_pcm_hw_params_user(substream, arg); 2913 case SNDRV_PCM_IOCTL_HW_FREE: 2914 return snd_pcm_hw_free(substream); 2915 case SNDRV_PCM_IOCTL_SW_PARAMS: 2916 return snd_pcm_sw_params_user(substream, arg); 2917 case SNDRV_PCM_IOCTL_STATUS: 2918 return snd_pcm_status_user(substream, arg, false); 2919 case SNDRV_PCM_IOCTL_STATUS_EXT: 2920 return snd_pcm_status_user(substream, arg, true); 2921 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2922 return snd_pcm_channel_info_user(substream, arg); 2923 case SNDRV_PCM_IOCTL_PREPARE: 2924 return snd_pcm_prepare(substream, file); 2925 case SNDRV_PCM_IOCTL_RESET: 2926 return snd_pcm_reset(substream); 2927 case SNDRV_PCM_IOCTL_START: 2928 return snd_pcm_start_lock_irq(substream); 2929 case SNDRV_PCM_IOCTL_LINK: 2930 return snd_pcm_link(substream, (int)(unsigned long) arg); 2931 case SNDRV_PCM_IOCTL_UNLINK: 2932 return snd_pcm_unlink(substream); 2933 case SNDRV_PCM_IOCTL_RESUME: 2934 return snd_pcm_resume(substream); 2935 case SNDRV_PCM_IOCTL_XRUN: 2936 return snd_pcm_xrun(substream); 2937 case SNDRV_PCM_IOCTL_HWSYNC: 2938 return snd_pcm_hwsync(substream); 2939 case SNDRV_PCM_IOCTL_DELAY: 2940 { 2941 snd_pcm_sframes_t delay; 2942 snd_pcm_sframes_t __user *res = arg; 2943 int err; 2944 2945 err = snd_pcm_delay(substream, &delay); 2946 if (err) 2947 return err; 2948 if (put_user(delay, res)) 2949 return -EFAULT; 2950 return 0; 2951 } 2952 case SNDRV_PCM_IOCTL_SYNC_PTR: 2953 return snd_pcm_sync_ptr(substream, arg); 2954 #ifdef CONFIG_SND_SUPPORT_OLD_API 2955 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2956 return snd_pcm_hw_refine_old_user(substream, arg); 2957 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2958 return snd_pcm_hw_params_old_user(substream, arg); 2959 #endif 2960 case SNDRV_PCM_IOCTL_DRAIN: 2961 return snd_pcm_drain(substream, file); 2962 case SNDRV_PCM_IOCTL_DROP: 2963 return snd_pcm_drop(substream); 2964 case SNDRV_PCM_IOCTL_PAUSE: 2965 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2966 substream, 2967 (int)(unsigned long)arg); 2968 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2969 case SNDRV_PCM_IOCTL_READI_FRAMES: 2970 return snd_pcm_xferi_frames_ioctl(substream, arg); 2971 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2972 case SNDRV_PCM_IOCTL_READN_FRAMES: 2973 return snd_pcm_xfern_frames_ioctl(substream, arg); 2974 case SNDRV_PCM_IOCTL_REWIND: 2975 return snd_pcm_rewind_ioctl(substream, arg); 2976 case SNDRV_PCM_IOCTL_FORWARD: 2977 return snd_pcm_forward_ioctl(substream, arg); 2978 } 2979 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2980 return -ENOTTY; 2981 } 2982 2983 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 2984 unsigned long arg) 2985 { 2986 struct snd_pcm_file *pcm_file; 2987 2988 pcm_file = file->private_data; 2989 2990 if (((cmd >> 8) & 0xff) != 'A') 2991 return -ENOTTY; 2992 2993 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 2994 (void __user *)arg); 2995 } 2996 2997 /** 2998 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 2999 * @substream: PCM substream 3000 * @cmd: IOCTL cmd 3001 * @arg: IOCTL argument 3002 * 3003 * The function is provided primarily for OSS layer and USB gadget drivers, 3004 * and it allows only the limited set of ioctls (hw_params, sw_params, 3005 * prepare, start, drain, drop, forward). 3006 */ 3007 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3008 unsigned int cmd, void *arg) 3009 { 3010 snd_pcm_uframes_t *frames = arg; 3011 snd_pcm_sframes_t result; 3012 3013 switch (cmd) { 3014 case SNDRV_PCM_IOCTL_FORWARD: 3015 { 3016 /* provided only for OSS; capture-only and no value returned */ 3017 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3018 return -EINVAL; 3019 result = snd_pcm_forward(substream, *frames); 3020 return result < 0 ? result : 0; 3021 } 3022 case SNDRV_PCM_IOCTL_HW_PARAMS: 3023 return snd_pcm_hw_params(substream, arg); 3024 case SNDRV_PCM_IOCTL_SW_PARAMS: 3025 return snd_pcm_sw_params(substream, arg); 3026 case SNDRV_PCM_IOCTL_PREPARE: 3027 return snd_pcm_prepare(substream, NULL); 3028 case SNDRV_PCM_IOCTL_START: 3029 return snd_pcm_start_lock_irq(substream); 3030 case SNDRV_PCM_IOCTL_DRAIN: 3031 return snd_pcm_drain(substream, NULL); 3032 case SNDRV_PCM_IOCTL_DROP: 3033 return snd_pcm_drop(substream); 3034 case SNDRV_PCM_IOCTL_DELAY: 3035 return snd_pcm_delay(substream, frames); 3036 default: 3037 return -EINVAL; 3038 } 3039 } 3040 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3041 3042 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3043 loff_t * offset) 3044 { 3045 struct snd_pcm_file *pcm_file; 3046 struct snd_pcm_substream *substream; 3047 struct snd_pcm_runtime *runtime; 3048 snd_pcm_sframes_t result; 3049 3050 pcm_file = file->private_data; 3051 substream = pcm_file->substream; 3052 if (PCM_RUNTIME_CHECK(substream)) 3053 return -ENXIO; 3054 runtime = substream->runtime; 3055 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3056 return -EBADFD; 3057 if (!frame_aligned(runtime, count)) 3058 return -EINVAL; 3059 count = bytes_to_frames(runtime, count); 3060 result = snd_pcm_lib_read(substream, buf, count); 3061 if (result > 0) 3062 result = frames_to_bytes(runtime, result); 3063 return result; 3064 } 3065 3066 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3067 size_t count, loff_t * offset) 3068 { 3069 struct snd_pcm_file *pcm_file; 3070 struct snd_pcm_substream *substream; 3071 struct snd_pcm_runtime *runtime; 3072 snd_pcm_sframes_t result; 3073 3074 pcm_file = file->private_data; 3075 substream = pcm_file->substream; 3076 if (PCM_RUNTIME_CHECK(substream)) 3077 return -ENXIO; 3078 runtime = substream->runtime; 3079 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3080 return -EBADFD; 3081 if (!frame_aligned(runtime, count)) 3082 return -EINVAL; 3083 count = bytes_to_frames(runtime, count); 3084 result = snd_pcm_lib_write(substream, buf, count); 3085 if (result > 0) 3086 result = frames_to_bytes(runtime, result); 3087 return result; 3088 } 3089 3090 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3091 { 3092 struct snd_pcm_file *pcm_file; 3093 struct snd_pcm_substream *substream; 3094 struct snd_pcm_runtime *runtime; 3095 snd_pcm_sframes_t result; 3096 unsigned long i; 3097 void __user **bufs; 3098 snd_pcm_uframes_t frames; 3099 3100 pcm_file = iocb->ki_filp->private_data; 3101 substream = pcm_file->substream; 3102 if (PCM_RUNTIME_CHECK(substream)) 3103 return -ENXIO; 3104 runtime = substream->runtime; 3105 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3106 return -EBADFD; 3107 if (!iter_is_iovec(to)) 3108 return -EINVAL; 3109 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3110 return -EINVAL; 3111 if (!frame_aligned(runtime, to->iov->iov_len)) 3112 return -EINVAL; 3113 frames = bytes_to_samples(runtime, to->iov->iov_len); 3114 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3115 if (bufs == NULL) 3116 return -ENOMEM; 3117 for (i = 0; i < to->nr_segs; ++i) 3118 bufs[i] = to->iov[i].iov_base; 3119 result = snd_pcm_lib_readv(substream, bufs, frames); 3120 if (result > 0) 3121 result = frames_to_bytes(runtime, result); 3122 kfree(bufs); 3123 return result; 3124 } 3125 3126 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3127 { 3128 struct snd_pcm_file *pcm_file; 3129 struct snd_pcm_substream *substream; 3130 struct snd_pcm_runtime *runtime; 3131 snd_pcm_sframes_t result; 3132 unsigned long i; 3133 void __user **bufs; 3134 snd_pcm_uframes_t frames; 3135 3136 pcm_file = iocb->ki_filp->private_data; 3137 substream = pcm_file->substream; 3138 if (PCM_RUNTIME_CHECK(substream)) 3139 return -ENXIO; 3140 runtime = substream->runtime; 3141 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3142 return -EBADFD; 3143 if (!iter_is_iovec(from)) 3144 return -EINVAL; 3145 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3146 !frame_aligned(runtime, from->iov->iov_len)) 3147 return -EINVAL; 3148 frames = bytes_to_samples(runtime, from->iov->iov_len); 3149 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3150 if (bufs == NULL) 3151 return -ENOMEM; 3152 for (i = 0; i < from->nr_segs; ++i) 3153 bufs[i] = from->iov[i].iov_base; 3154 result = snd_pcm_lib_writev(substream, bufs, frames); 3155 if (result > 0) 3156 result = frames_to_bytes(runtime, result); 3157 kfree(bufs); 3158 return result; 3159 } 3160 3161 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3162 { 3163 struct snd_pcm_file *pcm_file; 3164 struct snd_pcm_substream *substream; 3165 struct snd_pcm_runtime *runtime; 3166 __poll_t mask, ok; 3167 snd_pcm_uframes_t avail; 3168 3169 pcm_file = file->private_data; 3170 3171 substream = pcm_file->substream; 3172 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3173 ok = EPOLLOUT | EPOLLWRNORM; 3174 else 3175 ok = EPOLLIN | EPOLLRDNORM; 3176 if (PCM_RUNTIME_CHECK(substream)) 3177 return ok | EPOLLERR; 3178 3179 runtime = substream->runtime; 3180 poll_wait(file, &runtime->sleep, wait); 3181 3182 mask = 0; 3183 snd_pcm_stream_lock_irq(substream); 3184 avail = snd_pcm_avail(substream); 3185 switch (runtime->status->state) { 3186 case SNDRV_PCM_STATE_RUNNING: 3187 case SNDRV_PCM_STATE_PREPARED: 3188 case SNDRV_PCM_STATE_PAUSED: 3189 if (avail >= runtime->control->avail_min) 3190 mask = ok; 3191 break; 3192 case SNDRV_PCM_STATE_DRAINING: 3193 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3194 mask = ok; 3195 if (!avail) 3196 mask |= EPOLLERR; 3197 } 3198 break; 3199 default: 3200 mask = ok | EPOLLERR; 3201 break; 3202 } 3203 snd_pcm_stream_unlock_irq(substream); 3204 return mask; 3205 } 3206 3207 /* 3208 * mmap support 3209 */ 3210 3211 /* 3212 * Only on coherent architectures, we can mmap the status and the control records 3213 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3214 */ 3215 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3216 /* 3217 * mmap status record 3218 */ 3219 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3220 { 3221 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3222 struct snd_pcm_runtime *runtime; 3223 3224 if (substream == NULL) 3225 return VM_FAULT_SIGBUS; 3226 runtime = substream->runtime; 3227 vmf->page = virt_to_page(runtime->status); 3228 get_page(vmf->page); 3229 return 0; 3230 } 3231 3232 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3233 { 3234 .fault = snd_pcm_mmap_status_fault, 3235 }; 3236 3237 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3238 struct vm_area_struct *area) 3239 { 3240 long size; 3241 if (!(area->vm_flags & VM_READ)) 3242 return -EINVAL; 3243 size = area->vm_end - area->vm_start; 3244 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3245 return -EINVAL; 3246 area->vm_ops = &snd_pcm_vm_ops_status; 3247 area->vm_private_data = substream; 3248 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3249 return 0; 3250 } 3251 3252 /* 3253 * mmap control record 3254 */ 3255 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3256 { 3257 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3258 struct snd_pcm_runtime *runtime; 3259 3260 if (substream == NULL) 3261 return VM_FAULT_SIGBUS; 3262 runtime = substream->runtime; 3263 vmf->page = virt_to_page(runtime->control); 3264 get_page(vmf->page); 3265 return 0; 3266 } 3267 3268 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3269 { 3270 .fault = snd_pcm_mmap_control_fault, 3271 }; 3272 3273 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3274 struct vm_area_struct *area) 3275 { 3276 long size; 3277 if (!(area->vm_flags & VM_READ)) 3278 return -EINVAL; 3279 size = area->vm_end - area->vm_start; 3280 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3281 return -EINVAL; 3282 area->vm_ops = &snd_pcm_vm_ops_control; 3283 area->vm_private_data = substream; 3284 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3285 return 0; 3286 } 3287 3288 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3289 { 3290 if (pcm_file->no_compat_mmap) 3291 return false; 3292 /* See pcm_control_mmap_allowed() below. 3293 * Since older alsa-lib requires both status and control mmaps to be 3294 * coupled, we have to disable the status mmap for old alsa-lib, too. 3295 */ 3296 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3297 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3298 return false; 3299 return true; 3300 } 3301 3302 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3303 { 3304 if (pcm_file->no_compat_mmap) 3305 return false; 3306 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3307 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3308 * thus it effectively assures the manual update of appl_ptr. 3309 */ 3310 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3311 return false; 3312 return true; 3313 } 3314 3315 #else /* ! coherent mmap */ 3316 /* 3317 * don't support mmap for status and control records. 3318 */ 3319 #define pcm_status_mmap_allowed(pcm_file) false 3320 #define pcm_control_mmap_allowed(pcm_file) false 3321 3322 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3323 struct vm_area_struct *area) 3324 { 3325 return -ENXIO; 3326 } 3327 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3328 struct vm_area_struct *area) 3329 { 3330 return -ENXIO; 3331 } 3332 #endif /* coherent mmap */ 3333 3334 static inline struct page * 3335 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3336 { 3337 void *vaddr = substream->runtime->dma_area + ofs; 3338 return virt_to_page(vaddr); 3339 } 3340 3341 /* 3342 * fault callback for mmapping a RAM page 3343 */ 3344 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3345 { 3346 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3347 struct snd_pcm_runtime *runtime; 3348 unsigned long offset; 3349 struct page * page; 3350 size_t dma_bytes; 3351 3352 if (substream == NULL) 3353 return VM_FAULT_SIGBUS; 3354 runtime = substream->runtime; 3355 offset = vmf->pgoff << PAGE_SHIFT; 3356 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3357 if (offset > dma_bytes - PAGE_SIZE) 3358 return VM_FAULT_SIGBUS; 3359 if (substream->ops->page) 3360 page = substream->ops->page(substream, offset); 3361 else 3362 page = snd_pcm_default_page_ops(substream, offset); 3363 if (!page) 3364 return VM_FAULT_SIGBUS; 3365 get_page(page); 3366 vmf->page = page; 3367 return 0; 3368 } 3369 3370 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3371 .open = snd_pcm_mmap_data_open, 3372 .close = snd_pcm_mmap_data_close, 3373 }; 3374 3375 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3376 .open = snd_pcm_mmap_data_open, 3377 .close = snd_pcm_mmap_data_close, 3378 .fault = snd_pcm_mmap_data_fault, 3379 }; 3380 3381 /* 3382 * mmap the DMA buffer on RAM 3383 */ 3384 3385 /** 3386 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3387 * @substream: PCM substream 3388 * @area: VMA 3389 * 3390 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3391 * this function is invoked implicitly. 3392 */ 3393 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3394 struct vm_area_struct *area) 3395 { 3396 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3397 #ifdef CONFIG_GENERIC_ALLOCATOR 3398 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3399 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3400 return remap_pfn_range(area, area->vm_start, 3401 substream->dma_buffer.addr >> PAGE_SHIFT, 3402 area->vm_end - area->vm_start, area->vm_page_prot); 3403 } 3404 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3405 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3406 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3407 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3408 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3409 area, 3410 substream->runtime->dma_area, 3411 substream->runtime->dma_addr, 3412 substream->runtime->dma_bytes); 3413 #endif /* CONFIG_X86 */ 3414 /* mmap with fault handler */ 3415 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3416 return 0; 3417 } 3418 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3419 3420 /* 3421 * mmap the DMA buffer on I/O memory area 3422 */ 3423 #if SNDRV_PCM_INFO_MMAP_IOMEM 3424 /** 3425 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3426 * @substream: PCM substream 3427 * @area: VMA 3428 * 3429 * When your hardware uses the iomapped pages as the hardware buffer and 3430 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3431 * is supposed to work only on limited architectures. 3432 */ 3433 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3434 struct vm_area_struct *area) 3435 { 3436 struct snd_pcm_runtime *runtime = substream->runtime; 3437 3438 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3439 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3440 } 3441 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3442 #endif /* SNDRV_PCM_INFO_MMAP */ 3443 3444 /* 3445 * mmap DMA buffer 3446 */ 3447 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3448 struct vm_area_struct *area) 3449 { 3450 struct snd_pcm_runtime *runtime; 3451 long size; 3452 unsigned long offset; 3453 size_t dma_bytes; 3454 int err; 3455 3456 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3457 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3458 return -EINVAL; 3459 } else { 3460 if (!(area->vm_flags & VM_READ)) 3461 return -EINVAL; 3462 } 3463 runtime = substream->runtime; 3464 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3465 return -EBADFD; 3466 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3467 return -ENXIO; 3468 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3469 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3470 return -EINVAL; 3471 size = area->vm_end - area->vm_start; 3472 offset = area->vm_pgoff << PAGE_SHIFT; 3473 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3474 if ((size_t)size > dma_bytes) 3475 return -EINVAL; 3476 if (offset > dma_bytes - size) 3477 return -EINVAL; 3478 3479 area->vm_ops = &snd_pcm_vm_ops_data; 3480 area->vm_private_data = substream; 3481 if (substream->ops->mmap) 3482 err = substream->ops->mmap(substream, area); 3483 else 3484 err = snd_pcm_lib_default_mmap(substream, area); 3485 if (!err) 3486 atomic_inc(&substream->mmap_count); 3487 return err; 3488 } 3489 EXPORT_SYMBOL(snd_pcm_mmap_data); 3490 3491 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3492 { 3493 struct snd_pcm_file * pcm_file; 3494 struct snd_pcm_substream *substream; 3495 unsigned long offset; 3496 3497 pcm_file = file->private_data; 3498 substream = pcm_file->substream; 3499 if (PCM_RUNTIME_CHECK(substream)) 3500 return -ENXIO; 3501 3502 offset = area->vm_pgoff << PAGE_SHIFT; 3503 switch (offset) { 3504 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3505 if (!pcm_status_mmap_allowed(pcm_file)) 3506 return -ENXIO; 3507 return snd_pcm_mmap_status(substream, file, area); 3508 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3509 if (!pcm_control_mmap_allowed(pcm_file)) 3510 return -ENXIO; 3511 return snd_pcm_mmap_control(substream, file, area); 3512 default: 3513 return snd_pcm_mmap_data(substream, file, area); 3514 } 3515 return 0; 3516 } 3517 3518 static int snd_pcm_fasync(int fd, struct file * file, int on) 3519 { 3520 struct snd_pcm_file * pcm_file; 3521 struct snd_pcm_substream *substream; 3522 struct snd_pcm_runtime *runtime; 3523 3524 pcm_file = file->private_data; 3525 substream = pcm_file->substream; 3526 if (PCM_RUNTIME_CHECK(substream)) 3527 return -ENXIO; 3528 runtime = substream->runtime; 3529 return fasync_helper(fd, file, on, &runtime->fasync); 3530 } 3531 3532 /* 3533 * ioctl32 compat 3534 */ 3535 #ifdef CONFIG_COMPAT 3536 #include "pcm_compat.c" 3537 #else 3538 #define snd_pcm_ioctl_compat NULL 3539 #endif 3540 3541 /* 3542 * To be removed helpers to keep binary compatibility 3543 */ 3544 3545 #ifdef CONFIG_SND_SUPPORT_OLD_API 3546 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3547 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3548 3549 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3550 struct snd_pcm_hw_params_old *oparams) 3551 { 3552 unsigned int i; 3553 3554 memset(params, 0, sizeof(*params)); 3555 params->flags = oparams->flags; 3556 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3557 params->masks[i].bits[0] = oparams->masks[i]; 3558 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3559 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3560 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3561 params->info = oparams->info; 3562 params->msbits = oparams->msbits; 3563 params->rate_num = oparams->rate_num; 3564 params->rate_den = oparams->rate_den; 3565 params->fifo_size = oparams->fifo_size; 3566 } 3567 3568 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3569 struct snd_pcm_hw_params *params) 3570 { 3571 unsigned int i; 3572 3573 memset(oparams, 0, sizeof(*oparams)); 3574 oparams->flags = params->flags; 3575 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3576 oparams->masks[i] = params->masks[i].bits[0]; 3577 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3578 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3579 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3580 oparams->info = params->info; 3581 oparams->msbits = params->msbits; 3582 oparams->rate_num = params->rate_num; 3583 oparams->rate_den = params->rate_den; 3584 oparams->fifo_size = params->fifo_size; 3585 } 3586 3587 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3588 struct snd_pcm_hw_params_old __user * _oparams) 3589 { 3590 struct snd_pcm_hw_params *params; 3591 struct snd_pcm_hw_params_old *oparams = NULL; 3592 int err; 3593 3594 params = kmalloc(sizeof(*params), GFP_KERNEL); 3595 if (!params) 3596 return -ENOMEM; 3597 3598 oparams = memdup_user(_oparams, sizeof(*oparams)); 3599 if (IS_ERR(oparams)) { 3600 err = PTR_ERR(oparams); 3601 goto out; 3602 } 3603 snd_pcm_hw_convert_from_old_params(params, oparams); 3604 err = snd_pcm_hw_refine(substream, params); 3605 if (err < 0) 3606 goto out_old; 3607 3608 err = fixup_unreferenced_params(substream, params); 3609 if (err < 0) 3610 goto out_old; 3611 3612 snd_pcm_hw_convert_to_old_params(oparams, params); 3613 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3614 err = -EFAULT; 3615 out_old: 3616 kfree(oparams); 3617 out: 3618 kfree(params); 3619 return err; 3620 } 3621 3622 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3623 struct snd_pcm_hw_params_old __user * _oparams) 3624 { 3625 struct snd_pcm_hw_params *params; 3626 struct snd_pcm_hw_params_old *oparams = NULL; 3627 int err; 3628 3629 params = kmalloc(sizeof(*params), GFP_KERNEL); 3630 if (!params) 3631 return -ENOMEM; 3632 3633 oparams = memdup_user(_oparams, sizeof(*oparams)); 3634 if (IS_ERR(oparams)) { 3635 err = PTR_ERR(oparams); 3636 goto out; 3637 } 3638 3639 snd_pcm_hw_convert_from_old_params(params, oparams); 3640 err = snd_pcm_hw_params(substream, params); 3641 if (err < 0) 3642 goto out_old; 3643 3644 snd_pcm_hw_convert_to_old_params(oparams, params); 3645 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3646 err = -EFAULT; 3647 out_old: 3648 kfree(oparams); 3649 out: 3650 kfree(params); 3651 return err; 3652 } 3653 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3654 3655 #ifndef CONFIG_MMU 3656 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3657 unsigned long addr, 3658 unsigned long len, 3659 unsigned long pgoff, 3660 unsigned long flags) 3661 { 3662 struct snd_pcm_file *pcm_file = file->private_data; 3663 struct snd_pcm_substream *substream = pcm_file->substream; 3664 struct snd_pcm_runtime *runtime = substream->runtime; 3665 unsigned long offset = pgoff << PAGE_SHIFT; 3666 3667 switch (offset) { 3668 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3669 return (unsigned long)runtime->status; 3670 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3671 return (unsigned long)runtime->control; 3672 default: 3673 return (unsigned long)runtime->dma_area + offset; 3674 } 3675 } 3676 #else 3677 # define snd_pcm_get_unmapped_area NULL 3678 #endif 3679 3680 /* 3681 * Register section 3682 */ 3683 3684 const struct file_operations snd_pcm_f_ops[2] = { 3685 { 3686 .owner = THIS_MODULE, 3687 .write = snd_pcm_write, 3688 .write_iter = snd_pcm_writev, 3689 .open = snd_pcm_playback_open, 3690 .release = snd_pcm_release, 3691 .llseek = no_llseek, 3692 .poll = snd_pcm_poll, 3693 .unlocked_ioctl = snd_pcm_ioctl, 3694 .compat_ioctl = snd_pcm_ioctl_compat, 3695 .mmap = snd_pcm_mmap, 3696 .fasync = snd_pcm_fasync, 3697 .get_unmapped_area = snd_pcm_get_unmapped_area, 3698 }, 3699 { 3700 .owner = THIS_MODULE, 3701 .read = snd_pcm_read, 3702 .read_iter = snd_pcm_readv, 3703 .open = snd_pcm_capture_open, 3704 .release = snd_pcm_release, 3705 .llseek = no_llseek, 3706 .poll = snd_pcm_poll, 3707 .unlocked_ioctl = snd_pcm_ioctl, 3708 .compat_ioctl = snd_pcm_ioctl_compat, 3709 .mmap = snd_pcm_mmap, 3710 .fasync = snd_pcm_fasync, 3711 .get_unmapped_area = snd_pcm_get_unmapped_area, 3712 } 3713 }; 3714