1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/file.h> 25 #include <linux/slab.h> 26 #include <linux/sched/signal.h> 27 #include <linux/time.h> 28 #include <linux/pm_qos.h> 29 #include <linux/io.h> 30 #include <linux/dma-mapping.h> 31 #include <sound/core.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/pcm.h> 35 #include <sound/pcm_params.h> 36 #include <sound/timer.h> 37 #include <sound/minors.h> 38 #include <linux/uio.h> 39 #include <linux/delay.h> 40 41 #include "pcm_local.h" 42 43 #ifdef CONFIG_SND_DEBUG 44 #define CREATE_TRACE_POINTS 45 #include "pcm_param_trace.h" 46 #else 47 #define trace_hw_mask_param_enabled() 0 48 #define trace_hw_interval_param_enabled() 0 49 #define trace_hw_mask_param(substream, type, index, prev, curr) 50 #define trace_hw_interval_param(substream, type, index, prev, curr) 51 #endif 52 53 /* 54 * Compatibility 55 */ 56 57 struct snd_pcm_hw_params_old { 58 unsigned int flags; 59 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 60 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 61 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 62 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 63 unsigned int rmask; 64 unsigned int cmask; 65 unsigned int info; 66 unsigned int msbits; 67 unsigned int rate_num; 68 unsigned int rate_den; 69 snd_pcm_uframes_t fifo_size; 70 unsigned char reserved[64]; 71 }; 72 73 #ifdef CONFIG_SND_SUPPORT_OLD_API 74 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 75 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 76 77 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 78 struct snd_pcm_hw_params_old __user * _oparams); 79 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 80 struct snd_pcm_hw_params_old __user * _oparams); 81 #endif 82 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 83 84 /* 85 * 86 */ 87 88 static DECLARE_RWSEM(snd_pcm_link_rwsem); 89 90 void snd_pcm_group_init(struct snd_pcm_group *group) 91 { 92 spin_lock_init(&group->lock); 93 mutex_init(&group->mutex); 94 INIT_LIST_HEAD(&group->substreams); 95 refcount_set(&group->refs, 0); 96 } 97 98 /* define group lock helpers */ 99 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \ 100 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \ 101 { \ 102 if (nonatomic) \ 103 mutex_ ## mutex_action(&group->mutex); \ 104 else \ 105 spin_ ## action(&group->lock); \ 106 } 107 108 DEFINE_PCM_GROUP_LOCK(lock, lock); 109 DEFINE_PCM_GROUP_LOCK(unlock, unlock); 110 DEFINE_PCM_GROUP_LOCK(lock_irq, lock); 111 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock); 112 113 /** 114 * snd_pcm_stream_lock - Lock the PCM stream 115 * @substream: PCM substream 116 * 117 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 118 * flag of the given substream. This also takes the global link rw lock 119 * (or rw sem), too, for avoiding the race with linked streams. 120 */ 121 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 122 { 123 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic); 124 } 125 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 126 127 /** 128 * snd_pcm_stream_lock - Unlock the PCM stream 129 * @substream: PCM substream 130 * 131 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 132 */ 133 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 134 { 135 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic); 136 } 137 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 138 139 /** 140 * snd_pcm_stream_lock_irq - Lock the PCM stream 141 * @substream: PCM substream 142 * 143 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 144 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 145 * as snd_pcm_stream_lock(). 146 */ 147 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 148 { 149 snd_pcm_group_lock_irq(&substream->self_group, 150 substream->pcm->nonatomic); 151 } 152 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 153 154 /** 155 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 156 * @substream: PCM substream 157 * 158 * This is a counter-part of snd_pcm_stream_lock_irq(). 159 */ 160 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 161 { 162 snd_pcm_group_unlock_irq(&substream->self_group, 163 substream->pcm->nonatomic); 164 } 165 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 166 167 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 168 { 169 unsigned long flags = 0; 170 if (substream->pcm->nonatomic) 171 mutex_lock(&substream->self_group.mutex); 172 else 173 spin_lock_irqsave(&substream->self_group.lock, flags); 174 return flags; 175 } 176 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 177 178 /** 179 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 180 * @substream: PCM substream 181 * @flags: irq flags 182 * 183 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 184 */ 185 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 186 unsigned long flags) 187 { 188 if (substream->pcm->nonatomic) 189 mutex_unlock(&substream->self_group.mutex); 190 else 191 spin_unlock_irqrestore(&substream->self_group.lock, flags); 192 } 193 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 194 195 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 196 { 197 struct snd_pcm *pcm = substream->pcm; 198 struct snd_pcm_str *pstr = substream->pstr; 199 200 memset(info, 0, sizeof(*info)); 201 info->card = pcm->card->number; 202 info->device = pcm->device; 203 info->stream = substream->stream; 204 info->subdevice = substream->number; 205 strlcpy(info->id, pcm->id, sizeof(info->id)); 206 strlcpy(info->name, pcm->name, sizeof(info->name)); 207 info->dev_class = pcm->dev_class; 208 info->dev_subclass = pcm->dev_subclass; 209 info->subdevices_count = pstr->substream_count; 210 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 211 strlcpy(info->subname, substream->name, sizeof(info->subname)); 212 213 return 0; 214 } 215 216 int snd_pcm_info_user(struct snd_pcm_substream *substream, 217 struct snd_pcm_info __user * _info) 218 { 219 struct snd_pcm_info *info; 220 int err; 221 222 info = kmalloc(sizeof(*info), GFP_KERNEL); 223 if (! info) 224 return -ENOMEM; 225 err = snd_pcm_info(substream, info); 226 if (err >= 0) { 227 if (copy_to_user(_info, info, sizeof(*info))) 228 err = -EFAULT; 229 } 230 kfree(info); 231 return err; 232 } 233 234 static bool hw_support_mmap(struct snd_pcm_substream *substream) 235 { 236 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 237 return false; 238 /* architecture supports dma_mmap_coherent()? */ 239 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA) 240 if (!substream->ops->mmap && 241 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 242 return false; 243 #endif 244 return true; 245 } 246 247 static int constrain_mask_params(struct snd_pcm_substream *substream, 248 struct snd_pcm_hw_params *params) 249 { 250 struct snd_pcm_hw_constraints *constrs = 251 &substream->runtime->hw_constraints; 252 struct snd_mask *m; 253 unsigned int k; 254 struct snd_mask old_mask; 255 int changed; 256 257 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 258 m = hw_param_mask(params, k); 259 if (snd_mask_empty(m)) 260 return -EINVAL; 261 262 /* This parameter is not requested to change by a caller. */ 263 if (!(params->rmask & (1 << k))) 264 continue; 265 266 if (trace_hw_mask_param_enabled()) 267 old_mask = *m; 268 269 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 270 if (changed < 0) 271 return changed; 272 if (changed == 0) 273 continue; 274 275 /* Set corresponding flag so that the caller gets it. */ 276 trace_hw_mask_param(substream, k, 0, &old_mask, m); 277 params->cmask |= 1 << k; 278 } 279 280 return 0; 281 } 282 283 static int constrain_interval_params(struct snd_pcm_substream *substream, 284 struct snd_pcm_hw_params *params) 285 { 286 struct snd_pcm_hw_constraints *constrs = 287 &substream->runtime->hw_constraints; 288 struct snd_interval *i; 289 unsigned int k; 290 struct snd_interval old_interval; 291 int changed; 292 293 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 294 i = hw_param_interval(params, k); 295 if (snd_interval_empty(i)) 296 return -EINVAL; 297 298 /* This parameter is not requested to change by a caller. */ 299 if (!(params->rmask & (1 << k))) 300 continue; 301 302 if (trace_hw_interval_param_enabled()) 303 old_interval = *i; 304 305 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 306 if (changed < 0) 307 return changed; 308 if (changed == 0) 309 continue; 310 311 /* Set corresponding flag so that the caller gets it. */ 312 trace_hw_interval_param(substream, k, 0, &old_interval, i); 313 params->cmask |= 1 << k; 314 } 315 316 return 0; 317 } 318 319 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 320 struct snd_pcm_hw_params *params) 321 { 322 struct snd_pcm_hw_constraints *constrs = 323 &substream->runtime->hw_constraints; 324 unsigned int k; 325 unsigned int *rstamps; 326 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 327 unsigned int stamp; 328 struct snd_pcm_hw_rule *r; 329 unsigned int d; 330 struct snd_mask old_mask; 331 struct snd_interval old_interval; 332 bool again; 333 int changed, err = 0; 334 335 /* 336 * Each application of rule has own sequence number. 337 * 338 * Each member of 'rstamps' array represents the sequence number of 339 * recent application of corresponding rule. 340 */ 341 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 342 if (!rstamps) 343 return -ENOMEM; 344 345 /* 346 * Each member of 'vstamps' array represents the sequence number of 347 * recent application of rule in which corresponding parameters were 348 * changed. 349 * 350 * In initial state, elements corresponding to parameters requested by 351 * a caller is 1. For unrequested parameters, corresponding members 352 * have 0 so that the parameters are never changed anymore. 353 */ 354 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 355 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 356 357 /* Due to the above design, actual sequence number starts at 2. */ 358 stamp = 2; 359 retry: 360 /* Apply all rules in order. */ 361 again = false; 362 for (k = 0; k < constrs->rules_num; k++) { 363 r = &constrs->rules[k]; 364 365 /* 366 * Check condition bits of this rule. When the rule has 367 * some condition bits, parameter without the bits is 368 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 369 * is an example of the condition bits. 370 */ 371 if (r->cond && !(r->cond & params->flags)) 372 continue; 373 374 /* 375 * The 'deps' array includes maximum three dependencies 376 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 377 * member of this array is a sentinel and should be 378 * negative value. 379 * 380 * This rule should be processed in this time when dependent 381 * parameters were changed at former applications of the other 382 * rules. 383 */ 384 for (d = 0; r->deps[d] >= 0; d++) { 385 if (vstamps[r->deps[d]] > rstamps[k]) 386 break; 387 } 388 if (r->deps[d] < 0) 389 continue; 390 391 if (trace_hw_mask_param_enabled()) { 392 if (hw_is_mask(r->var)) 393 old_mask = *hw_param_mask(params, r->var); 394 } 395 if (trace_hw_interval_param_enabled()) { 396 if (hw_is_interval(r->var)) 397 old_interval = *hw_param_interval(params, r->var); 398 } 399 400 changed = r->func(params, r); 401 if (changed < 0) { 402 err = changed; 403 goto out; 404 } 405 406 /* 407 * When the parameter is changed, notify it to the caller 408 * by corresponding returned bit, then preparing for next 409 * iteration. 410 */ 411 if (changed && r->var >= 0) { 412 if (hw_is_mask(r->var)) { 413 trace_hw_mask_param(substream, r->var, 414 k + 1, &old_mask, 415 hw_param_mask(params, r->var)); 416 } 417 if (hw_is_interval(r->var)) { 418 trace_hw_interval_param(substream, r->var, 419 k + 1, &old_interval, 420 hw_param_interval(params, r->var)); 421 } 422 423 params->cmask |= (1 << r->var); 424 vstamps[r->var] = stamp; 425 again = true; 426 } 427 428 rstamps[k] = stamp++; 429 } 430 431 /* Iterate to evaluate all rules till no parameters are changed. */ 432 if (again) 433 goto retry; 434 435 out: 436 kfree(rstamps); 437 return err; 438 } 439 440 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 441 struct snd_pcm_hw_params *params) 442 { 443 const struct snd_interval *i; 444 const struct snd_mask *m; 445 int err; 446 447 if (!params->msbits) { 448 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 449 if (snd_interval_single(i)) 450 params->msbits = snd_interval_value(i); 451 } 452 453 if (!params->rate_den) { 454 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 455 if (snd_interval_single(i)) { 456 params->rate_num = snd_interval_value(i); 457 params->rate_den = 1; 458 } 459 } 460 461 if (!params->fifo_size) { 462 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 463 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 464 if (snd_mask_single(m) && snd_interval_single(i)) { 465 err = substream->ops->ioctl(substream, 466 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 467 if (err < 0) 468 return err; 469 } 470 } 471 472 if (!params->info) { 473 params->info = substream->runtime->hw.info; 474 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 475 SNDRV_PCM_INFO_DRAIN_TRIGGER); 476 if (!hw_support_mmap(substream)) 477 params->info &= ~(SNDRV_PCM_INFO_MMAP | 478 SNDRV_PCM_INFO_MMAP_VALID); 479 } 480 481 return 0; 482 } 483 484 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 485 struct snd_pcm_hw_params *params) 486 { 487 int err; 488 489 params->info = 0; 490 params->fifo_size = 0; 491 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 492 params->msbits = 0; 493 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 494 params->rate_num = 0; 495 params->rate_den = 0; 496 } 497 498 err = constrain_mask_params(substream, params); 499 if (err < 0) 500 return err; 501 502 err = constrain_interval_params(substream, params); 503 if (err < 0) 504 return err; 505 506 err = constrain_params_by_rules(substream, params); 507 if (err < 0) 508 return err; 509 510 params->rmask = 0; 511 512 return 0; 513 } 514 EXPORT_SYMBOL(snd_pcm_hw_refine); 515 516 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 517 struct snd_pcm_hw_params __user * _params) 518 { 519 struct snd_pcm_hw_params *params; 520 int err; 521 522 params = memdup_user(_params, sizeof(*params)); 523 if (IS_ERR(params)) 524 return PTR_ERR(params); 525 526 err = snd_pcm_hw_refine(substream, params); 527 if (err < 0) 528 goto end; 529 530 err = fixup_unreferenced_params(substream, params); 531 if (err < 0) 532 goto end; 533 534 if (copy_to_user(_params, params, sizeof(*params))) 535 err = -EFAULT; 536 end: 537 kfree(params); 538 return err; 539 } 540 541 static int period_to_usecs(struct snd_pcm_runtime *runtime) 542 { 543 int usecs; 544 545 if (! runtime->rate) 546 return -1; /* invalid */ 547 548 /* take 75% of period time as the deadline */ 549 usecs = (750000 / runtime->rate) * runtime->period_size; 550 usecs += ((750000 % runtime->rate) * runtime->period_size) / 551 runtime->rate; 552 553 return usecs; 554 } 555 556 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 557 { 558 snd_pcm_stream_lock_irq(substream); 559 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 560 substream->runtime->status->state = state; 561 snd_pcm_stream_unlock_irq(substream); 562 } 563 564 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 565 int event) 566 { 567 #ifdef CONFIG_SND_PCM_TIMER 568 if (substream->timer) 569 snd_timer_notify(substream->timer, event, 570 &substream->runtime->trigger_tstamp); 571 #endif 572 } 573 574 /** 575 * snd_pcm_hw_param_choose - choose a configuration defined by @params 576 * @pcm: PCM instance 577 * @params: the hw_params instance 578 * 579 * Choose one configuration from configuration space defined by @params. 580 * The configuration chosen is that obtained fixing in this order: 581 * first access, first format, first subformat, min channels, 582 * min rate, min period time, max buffer size, min tick time 583 * 584 * Return: Zero if successful, or a negative error code on failure. 585 */ 586 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 587 struct snd_pcm_hw_params *params) 588 { 589 static const int vars[] = { 590 SNDRV_PCM_HW_PARAM_ACCESS, 591 SNDRV_PCM_HW_PARAM_FORMAT, 592 SNDRV_PCM_HW_PARAM_SUBFORMAT, 593 SNDRV_PCM_HW_PARAM_CHANNELS, 594 SNDRV_PCM_HW_PARAM_RATE, 595 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 596 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 597 SNDRV_PCM_HW_PARAM_TICK_TIME, 598 -1 599 }; 600 const int *v; 601 struct snd_mask old_mask; 602 struct snd_interval old_interval; 603 int changed; 604 605 for (v = vars; *v != -1; v++) { 606 /* Keep old parameter to trace. */ 607 if (trace_hw_mask_param_enabled()) { 608 if (hw_is_mask(*v)) 609 old_mask = *hw_param_mask(params, *v); 610 } 611 if (trace_hw_interval_param_enabled()) { 612 if (hw_is_interval(*v)) 613 old_interval = *hw_param_interval(params, *v); 614 } 615 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 616 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 617 else 618 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 619 if (changed < 0) 620 return changed; 621 if (changed == 0) 622 continue; 623 624 /* Trace the changed parameter. */ 625 if (hw_is_mask(*v)) { 626 trace_hw_mask_param(pcm, *v, 0, &old_mask, 627 hw_param_mask(params, *v)); 628 } 629 if (hw_is_interval(*v)) { 630 trace_hw_interval_param(pcm, *v, 0, &old_interval, 631 hw_param_interval(params, *v)); 632 } 633 } 634 635 return 0; 636 } 637 638 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 639 struct snd_pcm_hw_params *params) 640 { 641 struct snd_pcm_runtime *runtime; 642 int err, usecs; 643 unsigned int bits; 644 snd_pcm_uframes_t frames; 645 646 if (PCM_RUNTIME_CHECK(substream)) 647 return -ENXIO; 648 runtime = substream->runtime; 649 snd_pcm_stream_lock_irq(substream); 650 switch (runtime->status->state) { 651 case SNDRV_PCM_STATE_OPEN: 652 case SNDRV_PCM_STATE_SETUP: 653 case SNDRV_PCM_STATE_PREPARED: 654 break; 655 default: 656 snd_pcm_stream_unlock_irq(substream); 657 return -EBADFD; 658 } 659 snd_pcm_stream_unlock_irq(substream); 660 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 661 if (!substream->oss.oss) 662 #endif 663 if (atomic_read(&substream->mmap_count)) 664 return -EBADFD; 665 666 params->rmask = ~0U; 667 err = snd_pcm_hw_refine(substream, params); 668 if (err < 0) 669 goto _error; 670 671 err = snd_pcm_hw_params_choose(substream, params); 672 if (err < 0) 673 goto _error; 674 675 err = fixup_unreferenced_params(substream, params); 676 if (err < 0) 677 goto _error; 678 679 if (substream->ops->hw_params != NULL) { 680 err = substream->ops->hw_params(substream, params); 681 if (err < 0) 682 goto _error; 683 } 684 685 runtime->access = params_access(params); 686 runtime->format = params_format(params); 687 runtime->subformat = params_subformat(params); 688 runtime->channels = params_channels(params); 689 runtime->rate = params_rate(params); 690 runtime->period_size = params_period_size(params); 691 runtime->periods = params_periods(params); 692 runtime->buffer_size = params_buffer_size(params); 693 runtime->info = params->info; 694 runtime->rate_num = params->rate_num; 695 runtime->rate_den = params->rate_den; 696 runtime->no_period_wakeup = 697 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 698 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 699 700 bits = snd_pcm_format_physical_width(runtime->format); 701 runtime->sample_bits = bits; 702 bits *= runtime->channels; 703 runtime->frame_bits = bits; 704 frames = 1; 705 while (bits % 8 != 0) { 706 bits *= 2; 707 frames *= 2; 708 } 709 runtime->byte_align = bits / 8; 710 runtime->min_align = frames; 711 712 /* Default sw params */ 713 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 714 runtime->period_step = 1; 715 runtime->control->avail_min = runtime->period_size; 716 runtime->start_threshold = 1; 717 runtime->stop_threshold = runtime->buffer_size; 718 runtime->silence_threshold = 0; 719 runtime->silence_size = 0; 720 runtime->boundary = runtime->buffer_size; 721 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 722 runtime->boundary *= 2; 723 724 snd_pcm_timer_resolution_change(substream); 725 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 726 727 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 728 pm_qos_remove_request(&substream->latency_pm_qos_req); 729 if ((usecs = period_to_usecs(runtime)) >= 0) 730 pm_qos_add_request(&substream->latency_pm_qos_req, 731 PM_QOS_CPU_DMA_LATENCY, usecs); 732 return 0; 733 _error: 734 /* hardware might be unusable from this time, 735 so we force application to retry to set 736 the correct hardware parameter settings */ 737 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 738 if (substream->ops->hw_free != NULL) 739 substream->ops->hw_free(substream); 740 return err; 741 } 742 743 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 744 struct snd_pcm_hw_params __user * _params) 745 { 746 struct snd_pcm_hw_params *params; 747 int err; 748 749 params = memdup_user(_params, sizeof(*params)); 750 if (IS_ERR(params)) 751 return PTR_ERR(params); 752 753 err = snd_pcm_hw_params(substream, params); 754 if (err < 0) 755 goto end; 756 757 if (copy_to_user(_params, params, sizeof(*params))) 758 err = -EFAULT; 759 end: 760 kfree(params); 761 return err; 762 } 763 764 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 765 { 766 struct snd_pcm_runtime *runtime; 767 int result = 0; 768 769 if (PCM_RUNTIME_CHECK(substream)) 770 return -ENXIO; 771 runtime = substream->runtime; 772 snd_pcm_stream_lock_irq(substream); 773 switch (runtime->status->state) { 774 case SNDRV_PCM_STATE_SETUP: 775 case SNDRV_PCM_STATE_PREPARED: 776 break; 777 default: 778 snd_pcm_stream_unlock_irq(substream); 779 return -EBADFD; 780 } 781 snd_pcm_stream_unlock_irq(substream); 782 if (atomic_read(&substream->mmap_count)) 783 return -EBADFD; 784 if (substream->ops->hw_free) 785 result = substream->ops->hw_free(substream); 786 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 787 pm_qos_remove_request(&substream->latency_pm_qos_req); 788 return result; 789 } 790 791 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 792 struct snd_pcm_sw_params *params) 793 { 794 struct snd_pcm_runtime *runtime; 795 int err; 796 797 if (PCM_RUNTIME_CHECK(substream)) 798 return -ENXIO; 799 runtime = substream->runtime; 800 snd_pcm_stream_lock_irq(substream); 801 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 802 snd_pcm_stream_unlock_irq(substream); 803 return -EBADFD; 804 } 805 snd_pcm_stream_unlock_irq(substream); 806 807 if (params->tstamp_mode < 0 || 808 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 809 return -EINVAL; 810 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 811 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 812 return -EINVAL; 813 if (params->avail_min == 0) 814 return -EINVAL; 815 if (params->silence_size >= runtime->boundary) { 816 if (params->silence_threshold != 0) 817 return -EINVAL; 818 } else { 819 if (params->silence_size > params->silence_threshold) 820 return -EINVAL; 821 if (params->silence_threshold > runtime->buffer_size) 822 return -EINVAL; 823 } 824 err = 0; 825 snd_pcm_stream_lock_irq(substream); 826 runtime->tstamp_mode = params->tstamp_mode; 827 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 828 runtime->tstamp_type = params->tstamp_type; 829 runtime->period_step = params->period_step; 830 runtime->control->avail_min = params->avail_min; 831 runtime->start_threshold = params->start_threshold; 832 runtime->stop_threshold = params->stop_threshold; 833 runtime->silence_threshold = params->silence_threshold; 834 runtime->silence_size = params->silence_size; 835 params->boundary = runtime->boundary; 836 if (snd_pcm_running(substream)) { 837 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 838 runtime->silence_size > 0) 839 snd_pcm_playback_silence(substream, ULONG_MAX); 840 err = snd_pcm_update_state(substream, runtime); 841 } 842 snd_pcm_stream_unlock_irq(substream); 843 return err; 844 } 845 846 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 847 struct snd_pcm_sw_params __user * _params) 848 { 849 struct snd_pcm_sw_params params; 850 int err; 851 if (copy_from_user(¶ms, _params, sizeof(params))) 852 return -EFAULT; 853 err = snd_pcm_sw_params(substream, ¶ms); 854 if (copy_to_user(_params, ¶ms, sizeof(params))) 855 return -EFAULT; 856 return err; 857 } 858 859 static inline snd_pcm_uframes_t 860 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 861 { 862 snd_pcm_uframes_t delay; 863 864 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 865 delay = snd_pcm_playback_hw_avail(substream->runtime); 866 else 867 delay = snd_pcm_capture_avail(substream->runtime); 868 return delay + substream->runtime->delay; 869 } 870 871 int snd_pcm_status(struct snd_pcm_substream *substream, 872 struct snd_pcm_status *status) 873 { 874 struct snd_pcm_runtime *runtime = substream->runtime; 875 876 snd_pcm_stream_lock_irq(substream); 877 878 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 879 &runtime->audio_tstamp_config); 880 881 /* backwards compatible behavior */ 882 if (runtime->audio_tstamp_config.type_requested == 883 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 884 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 885 runtime->audio_tstamp_config.type_requested = 886 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 887 else 888 runtime->audio_tstamp_config.type_requested = 889 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 890 runtime->audio_tstamp_report.valid = 0; 891 } else 892 runtime->audio_tstamp_report.valid = 1; 893 894 status->state = runtime->status->state; 895 status->suspended_state = runtime->status->suspended_state; 896 if (status->state == SNDRV_PCM_STATE_OPEN) 897 goto _end; 898 status->trigger_tstamp = runtime->trigger_tstamp; 899 if (snd_pcm_running(substream)) { 900 snd_pcm_update_hw_ptr(substream); 901 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 902 status->tstamp = runtime->status->tstamp; 903 status->driver_tstamp = runtime->driver_tstamp; 904 status->audio_tstamp = 905 runtime->status->audio_tstamp; 906 if (runtime->audio_tstamp_report.valid == 1) 907 /* backwards compatibility, no report provided in COMPAT mode */ 908 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 909 &status->audio_tstamp_accuracy, 910 &runtime->audio_tstamp_report); 911 912 goto _tstamp_end; 913 } 914 } else { 915 /* get tstamp only in fallback mode and only if enabled */ 916 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 917 snd_pcm_gettime(runtime, &status->tstamp); 918 } 919 _tstamp_end: 920 status->appl_ptr = runtime->control->appl_ptr; 921 status->hw_ptr = runtime->status->hw_ptr; 922 status->avail = snd_pcm_avail(substream); 923 status->delay = snd_pcm_running(substream) ? 924 snd_pcm_calc_delay(substream) : 0; 925 status->avail_max = runtime->avail_max; 926 status->overrange = runtime->overrange; 927 runtime->avail_max = 0; 928 runtime->overrange = 0; 929 _end: 930 snd_pcm_stream_unlock_irq(substream); 931 return 0; 932 } 933 934 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 935 struct snd_pcm_status __user * _status, 936 bool ext) 937 { 938 struct snd_pcm_status status; 939 int res; 940 941 memset(&status, 0, sizeof(status)); 942 /* 943 * with extension, parameters are read/write, 944 * get audio_tstamp_data from user, 945 * ignore rest of status structure 946 */ 947 if (ext && get_user(status.audio_tstamp_data, 948 (u32 __user *)(&_status->audio_tstamp_data))) 949 return -EFAULT; 950 res = snd_pcm_status(substream, &status); 951 if (res < 0) 952 return res; 953 if (copy_to_user(_status, &status, sizeof(status))) 954 return -EFAULT; 955 return 0; 956 } 957 958 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 959 struct snd_pcm_channel_info * info) 960 { 961 struct snd_pcm_runtime *runtime; 962 unsigned int channel; 963 964 channel = info->channel; 965 runtime = substream->runtime; 966 snd_pcm_stream_lock_irq(substream); 967 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 968 snd_pcm_stream_unlock_irq(substream); 969 return -EBADFD; 970 } 971 snd_pcm_stream_unlock_irq(substream); 972 if (channel >= runtime->channels) 973 return -EINVAL; 974 memset(info, 0, sizeof(*info)); 975 info->channel = channel; 976 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 977 } 978 979 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 980 struct snd_pcm_channel_info __user * _info) 981 { 982 struct snd_pcm_channel_info info; 983 int res; 984 985 if (copy_from_user(&info, _info, sizeof(info))) 986 return -EFAULT; 987 res = snd_pcm_channel_info(substream, &info); 988 if (res < 0) 989 return res; 990 if (copy_to_user(_info, &info, sizeof(info))) 991 return -EFAULT; 992 return 0; 993 } 994 995 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 996 { 997 struct snd_pcm_runtime *runtime = substream->runtime; 998 if (runtime->trigger_master == NULL) 999 return; 1000 if (runtime->trigger_master == substream) { 1001 if (!runtime->trigger_tstamp_latched) 1002 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1003 } else { 1004 snd_pcm_trigger_tstamp(runtime->trigger_master); 1005 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1006 } 1007 runtime->trigger_master = NULL; 1008 } 1009 1010 struct action_ops { 1011 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1012 int (*do_action)(struct snd_pcm_substream *substream, int state); 1013 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1014 void (*post_action)(struct snd_pcm_substream *substream, int state); 1015 }; 1016 1017 /* 1018 * this functions is core for handling of linked stream 1019 * Note: the stream state might be changed also on failure 1020 * Note2: call with calling stream lock + link lock 1021 */ 1022 static int snd_pcm_action_group(const struct action_ops *ops, 1023 struct snd_pcm_substream *substream, 1024 int state, int do_lock) 1025 { 1026 struct snd_pcm_substream *s = NULL; 1027 struct snd_pcm_substream *s1; 1028 int res = 0, depth = 1; 1029 1030 snd_pcm_group_for_each_entry(s, substream) { 1031 if (do_lock && s != substream) { 1032 if (s->pcm->nonatomic) 1033 mutex_lock_nested(&s->self_group.mutex, depth); 1034 else 1035 spin_lock_nested(&s->self_group.lock, depth); 1036 depth++; 1037 } 1038 res = ops->pre_action(s, state); 1039 if (res < 0) 1040 goto _unlock; 1041 } 1042 snd_pcm_group_for_each_entry(s, substream) { 1043 res = ops->do_action(s, state); 1044 if (res < 0) { 1045 if (ops->undo_action) { 1046 snd_pcm_group_for_each_entry(s1, substream) { 1047 if (s1 == s) /* failed stream */ 1048 break; 1049 ops->undo_action(s1, state); 1050 } 1051 } 1052 s = NULL; /* unlock all */ 1053 goto _unlock; 1054 } 1055 } 1056 snd_pcm_group_for_each_entry(s, substream) { 1057 ops->post_action(s, state); 1058 } 1059 _unlock: 1060 if (do_lock) { 1061 /* unlock streams */ 1062 snd_pcm_group_for_each_entry(s1, substream) { 1063 if (s1 != substream) { 1064 if (s1->pcm->nonatomic) 1065 mutex_unlock(&s1->self_group.mutex); 1066 else 1067 spin_unlock(&s1->self_group.lock); 1068 } 1069 if (s1 == s) /* end */ 1070 break; 1071 } 1072 } 1073 return res; 1074 } 1075 1076 /* 1077 * Note: call with stream lock 1078 */ 1079 static int snd_pcm_action_single(const struct action_ops *ops, 1080 struct snd_pcm_substream *substream, 1081 int state) 1082 { 1083 int res; 1084 1085 res = ops->pre_action(substream, state); 1086 if (res < 0) 1087 return res; 1088 res = ops->do_action(substream, state); 1089 if (res == 0) 1090 ops->post_action(substream, state); 1091 else if (ops->undo_action) 1092 ops->undo_action(substream, state); 1093 return res; 1094 } 1095 1096 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1097 struct snd_pcm_group *new_group) 1098 { 1099 substream->group = new_group; 1100 list_move(&substream->link_list, &new_group->substreams); 1101 } 1102 1103 /* 1104 * Unref and unlock the group, but keep the stream lock; 1105 * when the group becomes empty and no longer referred, destroy itself 1106 */ 1107 static void snd_pcm_group_unref(struct snd_pcm_group *group, 1108 struct snd_pcm_substream *substream) 1109 { 1110 bool do_free; 1111 1112 if (!group) 1113 return; 1114 do_free = refcount_dec_and_test(&group->refs) && 1115 list_empty(&group->substreams); 1116 snd_pcm_group_unlock(group, substream->pcm->nonatomic); 1117 if (do_free) 1118 kfree(group); 1119 } 1120 1121 /* 1122 * Lock the group inside a stream lock and reference it; 1123 * return the locked group object, or NULL if not linked 1124 */ 1125 static struct snd_pcm_group * 1126 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) 1127 { 1128 bool nonatomic = substream->pcm->nonatomic; 1129 struct snd_pcm_group *group; 1130 bool trylock; 1131 1132 for (;;) { 1133 if (!snd_pcm_stream_linked(substream)) 1134 return NULL; 1135 group = substream->group; 1136 /* block freeing the group object */ 1137 refcount_inc(&group->refs); 1138 1139 trylock = nonatomic ? mutex_trylock(&group->mutex) : 1140 spin_trylock(&group->lock); 1141 if (trylock) 1142 break; /* OK */ 1143 1144 /* re-lock for avoiding ABBA deadlock */ 1145 snd_pcm_stream_unlock(substream); 1146 snd_pcm_group_lock(group, nonatomic); 1147 snd_pcm_stream_lock(substream); 1148 1149 /* check the group again; the above opens a small race window */ 1150 if (substream->group == group) 1151 break; /* OK */ 1152 /* group changed, try again */ 1153 snd_pcm_group_unref(group, substream); 1154 } 1155 return group; 1156 } 1157 1158 /* 1159 * Note: call with stream lock 1160 */ 1161 static int snd_pcm_action(const struct action_ops *ops, 1162 struct snd_pcm_substream *substream, 1163 int state) 1164 { 1165 struct snd_pcm_group *group; 1166 int res; 1167 1168 group = snd_pcm_stream_group_ref(substream); 1169 if (group) 1170 res = snd_pcm_action_group(ops, substream, state, 1); 1171 else 1172 res = snd_pcm_action_single(ops, substream, state); 1173 snd_pcm_group_unref(group, substream); 1174 return res; 1175 } 1176 1177 /* 1178 * Note: don't use any locks before 1179 */ 1180 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1181 struct snd_pcm_substream *substream, 1182 int state) 1183 { 1184 int res; 1185 1186 snd_pcm_stream_lock_irq(substream); 1187 res = snd_pcm_action(ops, substream, state); 1188 snd_pcm_stream_unlock_irq(substream); 1189 return res; 1190 } 1191 1192 /* 1193 */ 1194 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1195 struct snd_pcm_substream *substream, 1196 int state) 1197 { 1198 int res; 1199 1200 /* Guarantee the group members won't change during non-atomic action */ 1201 down_read(&snd_pcm_link_rwsem); 1202 if (snd_pcm_stream_linked(substream)) 1203 res = snd_pcm_action_group(ops, substream, state, 0); 1204 else 1205 res = snd_pcm_action_single(ops, substream, state); 1206 up_read(&snd_pcm_link_rwsem); 1207 return res; 1208 } 1209 1210 /* 1211 * start callbacks 1212 */ 1213 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1214 { 1215 struct snd_pcm_runtime *runtime = substream->runtime; 1216 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1217 return -EBADFD; 1218 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1219 !snd_pcm_playback_data(substream)) 1220 return -EPIPE; 1221 runtime->trigger_tstamp_latched = false; 1222 runtime->trigger_master = substream; 1223 return 0; 1224 } 1225 1226 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1227 { 1228 if (substream->runtime->trigger_master != substream) 1229 return 0; 1230 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1231 } 1232 1233 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1234 { 1235 if (substream->runtime->trigger_master == substream) 1236 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1237 } 1238 1239 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1240 { 1241 struct snd_pcm_runtime *runtime = substream->runtime; 1242 snd_pcm_trigger_tstamp(substream); 1243 runtime->hw_ptr_jiffies = jiffies; 1244 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1245 runtime->rate; 1246 runtime->status->state = state; 1247 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1248 runtime->silence_size > 0) 1249 snd_pcm_playback_silence(substream, ULONG_MAX); 1250 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1251 } 1252 1253 static const struct action_ops snd_pcm_action_start = { 1254 .pre_action = snd_pcm_pre_start, 1255 .do_action = snd_pcm_do_start, 1256 .undo_action = snd_pcm_undo_start, 1257 .post_action = snd_pcm_post_start 1258 }; 1259 1260 /** 1261 * snd_pcm_start - start all linked streams 1262 * @substream: the PCM substream instance 1263 * 1264 * Return: Zero if successful, or a negative error code. 1265 * The stream lock must be acquired before calling this function. 1266 */ 1267 int snd_pcm_start(struct snd_pcm_substream *substream) 1268 { 1269 return snd_pcm_action(&snd_pcm_action_start, substream, 1270 SNDRV_PCM_STATE_RUNNING); 1271 } 1272 1273 /* take the stream lock and start the streams */ 1274 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1275 { 1276 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1277 SNDRV_PCM_STATE_RUNNING); 1278 } 1279 1280 /* 1281 * stop callbacks 1282 */ 1283 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1284 { 1285 struct snd_pcm_runtime *runtime = substream->runtime; 1286 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1287 return -EBADFD; 1288 runtime->trigger_master = substream; 1289 return 0; 1290 } 1291 1292 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1293 { 1294 if (substream->runtime->trigger_master == substream && 1295 snd_pcm_running(substream)) 1296 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1297 return 0; /* unconditonally stop all substreams */ 1298 } 1299 1300 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1301 { 1302 struct snd_pcm_runtime *runtime = substream->runtime; 1303 if (runtime->status->state != state) { 1304 snd_pcm_trigger_tstamp(substream); 1305 runtime->status->state = state; 1306 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1307 } 1308 wake_up(&runtime->sleep); 1309 wake_up(&runtime->tsleep); 1310 } 1311 1312 static const struct action_ops snd_pcm_action_stop = { 1313 .pre_action = snd_pcm_pre_stop, 1314 .do_action = snd_pcm_do_stop, 1315 .post_action = snd_pcm_post_stop 1316 }; 1317 1318 /** 1319 * snd_pcm_stop - try to stop all running streams in the substream group 1320 * @substream: the PCM substream instance 1321 * @state: PCM state after stopping the stream 1322 * 1323 * The state of each stream is then changed to the given state unconditionally. 1324 * 1325 * Return: Zero if successful, or a negative error code. 1326 */ 1327 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1328 { 1329 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1330 } 1331 EXPORT_SYMBOL(snd_pcm_stop); 1332 1333 /** 1334 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1335 * @substream: the PCM substream 1336 * 1337 * After stopping, the state is changed to SETUP. 1338 * Unlike snd_pcm_stop(), this affects only the given stream. 1339 * 1340 * Return: Zero if succesful, or a negative error code. 1341 */ 1342 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1343 { 1344 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1345 SNDRV_PCM_STATE_SETUP); 1346 } 1347 1348 /** 1349 * snd_pcm_stop_xrun - stop the running streams as XRUN 1350 * @substream: the PCM substream instance 1351 * 1352 * This stops the given running substream (and all linked substreams) as XRUN. 1353 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1354 * 1355 * Return: Zero if successful, or a negative error code. 1356 */ 1357 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1358 { 1359 unsigned long flags; 1360 1361 snd_pcm_stream_lock_irqsave(substream, flags); 1362 if (substream->runtime && snd_pcm_running(substream)) 1363 __snd_pcm_xrun(substream); 1364 snd_pcm_stream_unlock_irqrestore(substream, flags); 1365 return 0; 1366 } 1367 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1368 1369 /* 1370 * pause callbacks 1371 */ 1372 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1373 { 1374 struct snd_pcm_runtime *runtime = substream->runtime; 1375 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1376 return -ENOSYS; 1377 if (push) { 1378 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1379 return -EBADFD; 1380 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1381 return -EBADFD; 1382 runtime->trigger_master = substream; 1383 return 0; 1384 } 1385 1386 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1387 { 1388 if (substream->runtime->trigger_master != substream) 1389 return 0; 1390 /* some drivers might use hw_ptr to recover from the pause - 1391 update the hw_ptr now */ 1392 if (push) 1393 snd_pcm_update_hw_ptr(substream); 1394 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1395 * a delta between the current jiffies, this gives a large enough 1396 * delta, effectively to skip the check once. 1397 */ 1398 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1399 return substream->ops->trigger(substream, 1400 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1401 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1402 } 1403 1404 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1405 { 1406 if (substream->runtime->trigger_master == substream) 1407 substream->ops->trigger(substream, 1408 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1409 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1410 } 1411 1412 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1413 { 1414 struct snd_pcm_runtime *runtime = substream->runtime; 1415 snd_pcm_trigger_tstamp(substream); 1416 if (push) { 1417 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1418 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1419 wake_up(&runtime->sleep); 1420 wake_up(&runtime->tsleep); 1421 } else { 1422 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1423 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1424 } 1425 } 1426 1427 static const struct action_ops snd_pcm_action_pause = { 1428 .pre_action = snd_pcm_pre_pause, 1429 .do_action = snd_pcm_do_pause, 1430 .undo_action = snd_pcm_undo_pause, 1431 .post_action = snd_pcm_post_pause 1432 }; 1433 1434 /* 1435 * Push/release the pause for all linked streams. 1436 */ 1437 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1438 { 1439 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1440 } 1441 1442 #ifdef CONFIG_PM 1443 /* suspend */ 1444 1445 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1446 { 1447 struct snd_pcm_runtime *runtime = substream->runtime; 1448 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1449 return -EBUSY; 1450 runtime->trigger_master = substream; 1451 return 0; 1452 } 1453 1454 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1455 { 1456 struct snd_pcm_runtime *runtime = substream->runtime; 1457 if (runtime->trigger_master != substream) 1458 return 0; 1459 if (! snd_pcm_running(substream)) 1460 return 0; 1461 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1462 return 0; /* suspend unconditionally */ 1463 } 1464 1465 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1466 { 1467 struct snd_pcm_runtime *runtime = substream->runtime; 1468 snd_pcm_trigger_tstamp(substream); 1469 runtime->status->suspended_state = runtime->status->state; 1470 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1471 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1472 wake_up(&runtime->sleep); 1473 wake_up(&runtime->tsleep); 1474 } 1475 1476 static const struct action_ops snd_pcm_action_suspend = { 1477 .pre_action = snd_pcm_pre_suspend, 1478 .do_action = snd_pcm_do_suspend, 1479 .post_action = snd_pcm_post_suspend 1480 }; 1481 1482 /* 1483 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1484 * @substream: the PCM substream 1485 * 1486 * After this call, all streams are changed to SUSPENDED state. 1487 * 1488 * Return: Zero if successful, or a negative error code. 1489 */ 1490 static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1491 { 1492 int err; 1493 unsigned long flags; 1494 1495 snd_pcm_stream_lock_irqsave(substream, flags); 1496 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1497 snd_pcm_stream_unlock_irqrestore(substream, flags); 1498 return err; 1499 } 1500 1501 /** 1502 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1503 * @pcm: the PCM instance 1504 * 1505 * After this call, all streams are changed to SUSPENDED state. 1506 * 1507 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1508 */ 1509 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1510 { 1511 struct snd_pcm_substream *substream; 1512 int stream, err = 0; 1513 1514 if (! pcm) 1515 return 0; 1516 1517 for (stream = 0; stream < 2; stream++) { 1518 for (substream = pcm->streams[stream].substream; 1519 substream; substream = substream->next) { 1520 /* FIXME: the open/close code should lock this as well */ 1521 if (substream->runtime == NULL) 1522 continue; 1523 err = snd_pcm_suspend(substream); 1524 if (err < 0 && err != -EBUSY) 1525 return err; 1526 } 1527 } 1528 return 0; 1529 } 1530 EXPORT_SYMBOL(snd_pcm_suspend_all); 1531 1532 /* resume */ 1533 1534 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1535 { 1536 struct snd_pcm_runtime *runtime = substream->runtime; 1537 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1538 return -ENOSYS; 1539 runtime->trigger_master = substream; 1540 return 0; 1541 } 1542 1543 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1544 { 1545 struct snd_pcm_runtime *runtime = substream->runtime; 1546 if (runtime->trigger_master != substream) 1547 return 0; 1548 /* DMA not running previously? */ 1549 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1550 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1551 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1552 return 0; 1553 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1554 } 1555 1556 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1557 { 1558 if (substream->runtime->trigger_master == substream && 1559 snd_pcm_running(substream)) 1560 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1561 } 1562 1563 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1564 { 1565 struct snd_pcm_runtime *runtime = substream->runtime; 1566 snd_pcm_trigger_tstamp(substream); 1567 runtime->status->state = runtime->status->suspended_state; 1568 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1569 } 1570 1571 static const struct action_ops snd_pcm_action_resume = { 1572 .pre_action = snd_pcm_pre_resume, 1573 .do_action = snd_pcm_do_resume, 1574 .undo_action = snd_pcm_undo_resume, 1575 .post_action = snd_pcm_post_resume 1576 }; 1577 1578 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1579 { 1580 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1581 } 1582 1583 #else 1584 1585 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1586 { 1587 return -ENOSYS; 1588 } 1589 1590 #endif /* CONFIG_PM */ 1591 1592 /* 1593 * xrun ioctl 1594 * 1595 * Change the RUNNING stream(s) to XRUN state. 1596 */ 1597 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1598 { 1599 struct snd_pcm_runtime *runtime = substream->runtime; 1600 int result; 1601 1602 snd_pcm_stream_lock_irq(substream); 1603 switch (runtime->status->state) { 1604 case SNDRV_PCM_STATE_XRUN: 1605 result = 0; /* already there */ 1606 break; 1607 case SNDRV_PCM_STATE_RUNNING: 1608 __snd_pcm_xrun(substream); 1609 result = 0; 1610 break; 1611 default: 1612 result = -EBADFD; 1613 } 1614 snd_pcm_stream_unlock_irq(substream); 1615 return result; 1616 } 1617 1618 /* 1619 * reset ioctl 1620 */ 1621 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1622 { 1623 struct snd_pcm_runtime *runtime = substream->runtime; 1624 switch (runtime->status->state) { 1625 case SNDRV_PCM_STATE_RUNNING: 1626 case SNDRV_PCM_STATE_PREPARED: 1627 case SNDRV_PCM_STATE_PAUSED: 1628 case SNDRV_PCM_STATE_SUSPENDED: 1629 return 0; 1630 default: 1631 return -EBADFD; 1632 } 1633 } 1634 1635 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1636 { 1637 struct snd_pcm_runtime *runtime = substream->runtime; 1638 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1639 if (err < 0) 1640 return err; 1641 runtime->hw_ptr_base = 0; 1642 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1643 runtime->status->hw_ptr % runtime->period_size; 1644 runtime->silence_start = runtime->status->hw_ptr; 1645 runtime->silence_filled = 0; 1646 return 0; 1647 } 1648 1649 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1650 { 1651 struct snd_pcm_runtime *runtime = substream->runtime; 1652 runtime->control->appl_ptr = runtime->status->hw_ptr; 1653 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1654 runtime->silence_size > 0) 1655 snd_pcm_playback_silence(substream, ULONG_MAX); 1656 } 1657 1658 static const struct action_ops snd_pcm_action_reset = { 1659 .pre_action = snd_pcm_pre_reset, 1660 .do_action = snd_pcm_do_reset, 1661 .post_action = snd_pcm_post_reset 1662 }; 1663 1664 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1665 { 1666 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1667 } 1668 1669 /* 1670 * prepare ioctl 1671 */ 1672 /* we use the second argument for updating f_flags */ 1673 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1674 int f_flags) 1675 { 1676 struct snd_pcm_runtime *runtime = substream->runtime; 1677 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1678 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1679 return -EBADFD; 1680 if (snd_pcm_running(substream)) 1681 return -EBUSY; 1682 substream->f_flags = f_flags; 1683 return 0; 1684 } 1685 1686 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1687 { 1688 int err; 1689 err = substream->ops->prepare(substream); 1690 if (err < 0) 1691 return err; 1692 return snd_pcm_do_reset(substream, 0); 1693 } 1694 1695 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1696 { 1697 struct snd_pcm_runtime *runtime = substream->runtime; 1698 runtime->control->appl_ptr = runtime->status->hw_ptr; 1699 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1700 } 1701 1702 static const struct action_ops snd_pcm_action_prepare = { 1703 .pre_action = snd_pcm_pre_prepare, 1704 .do_action = snd_pcm_do_prepare, 1705 .post_action = snd_pcm_post_prepare 1706 }; 1707 1708 /** 1709 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1710 * @substream: the PCM substream instance 1711 * @file: file to refer f_flags 1712 * 1713 * Return: Zero if successful, or a negative error code. 1714 */ 1715 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1716 struct file *file) 1717 { 1718 int f_flags; 1719 1720 if (file) 1721 f_flags = file->f_flags; 1722 else 1723 f_flags = substream->f_flags; 1724 1725 snd_pcm_stream_lock_irq(substream); 1726 switch (substream->runtime->status->state) { 1727 case SNDRV_PCM_STATE_PAUSED: 1728 snd_pcm_pause(substream, 0); 1729 /* fallthru */ 1730 case SNDRV_PCM_STATE_SUSPENDED: 1731 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1732 break; 1733 } 1734 snd_pcm_stream_unlock_irq(substream); 1735 1736 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1737 substream, f_flags); 1738 } 1739 1740 /* 1741 * drain ioctl 1742 */ 1743 1744 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1745 { 1746 struct snd_pcm_runtime *runtime = substream->runtime; 1747 switch (runtime->status->state) { 1748 case SNDRV_PCM_STATE_OPEN: 1749 case SNDRV_PCM_STATE_DISCONNECTED: 1750 case SNDRV_PCM_STATE_SUSPENDED: 1751 return -EBADFD; 1752 } 1753 runtime->trigger_master = substream; 1754 return 0; 1755 } 1756 1757 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1758 { 1759 struct snd_pcm_runtime *runtime = substream->runtime; 1760 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1761 switch (runtime->status->state) { 1762 case SNDRV_PCM_STATE_PREPARED: 1763 /* start playback stream if possible */ 1764 if (! snd_pcm_playback_empty(substream)) { 1765 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1766 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1767 } else { 1768 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1769 } 1770 break; 1771 case SNDRV_PCM_STATE_RUNNING: 1772 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1773 break; 1774 case SNDRV_PCM_STATE_XRUN: 1775 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1776 break; 1777 default: 1778 break; 1779 } 1780 } else { 1781 /* stop running stream */ 1782 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1783 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1784 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1785 snd_pcm_do_stop(substream, new_state); 1786 snd_pcm_post_stop(substream, new_state); 1787 } 1788 } 1789 1790 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1791 runtime->trigger_master == substream && 1792 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1793 return substream->ops->trigger(substream, 1794 SNDRV_PCM_TRIGGER_DRAIN); 1795 1796 return 0; 1797 } 1798 1799 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1800 { 1801 } 1802 1803 static const struct action_ops snd_pcm_action_drain_init = { 1804 .pre_action = snd_pcm_pre_drain_init, 1805 .do_action = snd_pcm_do_drain_init, 1806 .post_action = snd_pcm_post_drain_init 1807 }; 1808 1809 /* 1810 * Drain the stream(s). 1811 * When the substream is linked, sync until the draining of all playback streams 1812 * is finished. 1813 * After this call, all streams are supposed to be either SETUP or DRAINING 1814 * (capture only) state. 1815 */ 1816 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1817 struct file *file) 1818 { 1819 struct snd_card *card; 1820 struct snd_pcm_runtime *runtime; 1821 struct snd_pcm_substream *s; 1822 struct snd_pcm_group *group; 1823 wait_queue_entry_t wait; 1824 int result = 0; 1825 int nonblock = 0; 1826 1827 card = substream->pcm->card; 1828 runtime = substream->runtime; 1829 1830 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1831 return -EBADFD; 1832 1833 if (file) { 1834 if (file->f_flags & O_NONBLOCK) 1835 nonblock = 1; 1836 } else if (substream->f_flags & O_NONBLOCK) 1837 nonblock = 1; 1838 1839 snd_pcm_stream_lock_irq(substream); 1840 /* resume pause */ 1841 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1842 snd_pcm_pause(substream, 0); 1843 1844 /* pre-start/stop - all running streams are changed to DRAINING state */ 1845 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1846 if (result < 0) 1847 goto unlock; 1848 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1849 if (nonblock) { 1850 result = -EAGAIN; 1851 goto unlock; 1852 } 1853 1854 for (;;) { 1855 long tout; 1856 struct snd_pcm_runtime *to_check; 1857 if (signal_pending(current)) { 1858 result = -ERESTARTSYS; 1859 break; 1860 } 1861 /* find a substream to drain */ 1862 to_check = NULL; 1863 group = snd_pcm_stream_group_ref(substream); 1864 snd_pcm_group_for_each_entry(s, substream) { 1865 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1866 continue; 1867 runtime = s->runtime; 1868 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1869 to_check = runtime; 1870 break; 1871 } 1872 } 1873 snd_pcm_group_unref(group, substream); 1874 if (!to_check) 1875 break; /* all drained */ 1876 init_waitqueue_entry(&wait, current); 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_interruptible(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 snd_pcm_stream_unlock(substream1); 2024 snd_pcm_group_unlock_irq(target_group, nonatomic); 2025 _end: 2026 up_write(&snd_pcm_link_rwsem); 2027 _nolock: 2028 kfree(group); 2029 _badf: 2030 fdput(f); 2031 return res; 2032 } 2033 2034 static void relink_to_local(struct snd_pcm_substream *substream) 2035 { 2036 snd_pcm_stream_lock(substream); 2037 snd_pcm_group_assign(substream, &substream->self_group); 2038 snd_pcm_stream_unlock(substream); 2039 } 2040 2041 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2042 { 2043 struct snd_pcm_group *group; 2044 bool nonatomic = substream->pcm->nonatomic; 2045 bool do_free = false; 2046 int res = 0; 2047 2048 down_write(&snd_pcm_link_rwsem); 2049 2050 if (!snd_pcm_stream_linked(substream)) { 2051 res = -EALREADY; 2052 goto _end; 2053 } 2054 2055 group = substream->group; 2056 snd_pcm_group_lock_irq(group, nonatomic); 2057 2058 relink_to_local(substream); 2059 2060 /* detach the last stream, too */ 2061 if (list_is_singular(&group->substreams)) { 2062 relink_to_local(list_first_entry(&group->substreams, 2063 struct snd_pcm_substream, 2064 link_list)); 2065 do_free = !refcount_read(&group->refs); 2066 } 2067 2068 snd_pcm_group_unlock_irq(group, nonatomic); 2069 if (do_free) 2070 kfree(group); 2071 2072 _end: 2073 up_write(&snd_pcm_link_rwsem); 2074 return res; 2075 } 2076 2077 /* 2078 * hw configurator 2079 */ 2080 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2081 struct snd_pcm_hw_rule *rule) 2082 { 2083 struct snd_interval t; 2084 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2085 hw_param_interval_c(params, rule->deps[1]), &t); 2086 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2087 } 2088 2089 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2090 struct snd_pcm_hw_rule *rule) 2091 { 2092 struct snd_interval t; 2093 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2094 hw_param_interval_c(params, rule->deps[1]), &t); 2095 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2096 } 2097 2098 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2099 struct snd_pcm_hw_rule *rule) 2100 { 2101 struct snd_interval t; 2102 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2103 hw_param_interval_c(params, rule->deps[1]), 2104 (unsigned long) rule->private, &t); 2105 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2106 } 2107 2108 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2109 struct snd_pcm_hw_rule *rule) 2110 { 2111 struct snd_interval t; 2112 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2113 (unsigned long) rule->private, 2114 hw_param_interval_c(params, rule->deps[1]), &t); 2115 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2116 } 2117 2118 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2119 struct snd_pcm_hw_rule *rule) 2120 { 2121 unsigned int k; 2122 const struct snd_interval *i = 2123 hw_param_interval_c(params, rule->deps[0]); 2124 struct snd_mask m; 2125 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2126 snd_mask_any(&m); 2127 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2128 int bits; 2129 if (! snd_mask_test(mask, k)) 2130 continue; 2131 bits = snd_pcm_format_physical_width(k); 2132 if (bits <= 0) 2133 continue; /* ignore invalid formats */ 2134 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2135 snd_mask_reset(&m, k); 2136 } 2137 return snd_mask_refine(mask, &m); 2138 } 2139 2140 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2141 struct snd_pcm_hw_rule *rule) 2142 { 2143 struct snd_interval t; 2144 unsigned int k; 2145 t.min = UINT_MAX; 2146 t.max = 0; 2147 t.openmin = 0; 2148 t.openmax = 0; 2149 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2150 int bits; 2151 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2152 continue; 2153 bits = snd_pcm_format_physical_width(k); 2154 if (bits <= 0) 2155 continue; /* ignore invalid formats */ 2156 if (t.min > (unsigned)bits) 2157 t.min = bits; 2158 if (t.max < (unsigned)bits) 2159 t.max = bits; 2160 } 2161 t.integer = 1; 2162 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2163 } 2164 2165 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2166 #error "Change this table" 2167 #endif 2168 2169 static const unsigned int rates[] = { 2170 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2171 48000, 64000, 88200, 96000, 176400, 192000 2172 }; 2173 2174 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2175 .count = ARRAY_SIZE(rates), 2176 .list = rates, 2177 }; 2178 2179 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2180 struct snd_pcm_hw_rule *rule) 2181 { 2182 struct snd_pcm_hardware *hw = rule->private; 2183 return snd_interval_list(hw_param_interval(params, rule->var), 2184 snd_pcm_known_rates.count, 2185 snd_pcm_known_rates.list, hw->rates); 2186 } 2187 2188 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2189 struct snd_pcm_hw_rule *rule) 2190 { 2191 struct snd_interval t; 2192 struct snd_pcm_substream *substream = rule->private; 2193 t.min = 0; 2194 t.max = substream->buffer_bytes_max; 2195 t.openmin = 0; 2196 t.openmax = 0; 2197 t.integer = 1; 2198 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2199 } 2200 2201 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2202 { 2203 struct snd_pcm_runtime *runtime = substream->runtime; 2204 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2205 int k, err; 2206 2207 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2208 snd_mask_any(constrs_mask(constrs, k)); 2209 } 2210 2211 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2212 snd_interval_any(constrs_interval(constrs, k)); 2213 } 2214 2215 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2216 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2217 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2218 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2219 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2220 2221 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2222 snd_pcm_hw_rule_format, NULL, 2223 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2224 if (err < 0) 2225 return err; 2226 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2227 snd_pcm_hw_rule_sample_bits, NULL, 2228 SNDRV_PCM_HW_PARAM_FORMAT, 2229 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2230 if (err < 0) 2231 return err; 2232 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2233 snd_pcm_hw_rule_div, NULL, 2234 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2235 if (err < 0) 2236 return err; 2237 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2238 snd_pcm_hw_rule_mul, NULL, 2239 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2240 if (err < 0) 2241 return err; 2242 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2243 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2244 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2245 if (err < 0) 2246 return err; 2247 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2248 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2249 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2250 if (err < 0) 2251 return err; 2252 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2253 snd_pcm_hw_rule_div, NULL, 2254 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2255 if (err < 0) 2256 return err; 2257 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2258 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2259 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2260 if (err < 0) 2261 return err; 2262 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2263 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2264 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2265 if (err < 0) 2266 return err; 2267 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2268 snd_pcm_hw_rule_div, NULL, 2269 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2270 if (err < 0) 2271 return err; 2272 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2273 snd_pcm_hw_rule_div, NULL, 2274 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2275 if (err < 0) 2276 return err; 2277 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2278 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2279 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2280 if (err < 0) 2281 return err; 2282 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2283 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2284 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2285 if (err < 0) 2286 return err; 2287 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2288 snd_pcm_hw_rule_mul, NULL, 2289 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2290 if (err < 0) 2291 return err; 2292 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2293 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2294 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2295 if (err < 0) 2296 return err; 2297 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2298 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2299 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2300 if (err < 0) 2301 return err; 2302 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2303 snd_pcm_hw_rule_muldivk, (void*) 8, 2304 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2305 if (err < 0) 2306 return err; 2307 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2308 snd_pcm_hw_rule_muldivk, (void*) 8, 2309 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2310 if (err < 0) 2311 return err; 2312 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2313 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2314 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2315 if (err < 0) 2316 return err; 2317 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2318 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2319 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2320 if (err < 0) 2321 return err; 2322 return 0; 2323 } 2324 2325 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2326 { 2327 struct snd_pcm_runtime *runtime = substream->runtime; 2328 struct snd_pcm_hardware *hw = &runtime->hw; 2329 int err; 2330 unsigned int mask = 0; 2331 2332 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2333 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2334 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2335 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2336 if (hw_support_mmap(substream)) { 2337 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2338 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2339 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2340 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2341 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2342 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2343 } 2344 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2345 if (err < 0) 2346 return err; 2347 2348 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2349 if (err < 0) 2350 return err; 2351 2352 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2353 if (err < 0) 2354 return err; 2355 2356 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2357 hw->channels_min, hw->channels_max); 2358 if (err < 0) 2359 return err; 2360 2361 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2362 hw->rate_min, hw->rate_max); 2363 if (err < 0) 2364 return err; 2365 2366 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2367 hw->period_bytes_min, hw->period_bytes_max); 2368 if (err < 0) 2369 return err; 2370 2371 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2372 hw->periods_min, hw->periods_max); 2373 if (err < 0) 2374 return err; 2375 2376 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2377 hw->period_bytes_min, hw->buffer_bytes_max); 2378 if (err < 0) 2379 return err; 2380 2381 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2382 snd_pcm_hw_rule_buffer_bytes_max, substream, 2383 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2384 if (err < 0) 2385 return err; 2386 2387 /* FIXME: remove */ 2388 if (runtime->dma_bytes) { 2389 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2390 if (err < 0) 2391 return err; 2392 } 2393 2394 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2395 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2396 snd_pcm_hw_rule_rate, hw, 2397 SNDRV_PCM_HW_PARAM_RATE, -1); 2398 if (err < 0) 2399 return err; 2400 } 2401 2402 /* FIXME: this belong to lowlevel */ 2403 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2404 2405 return 0; 2406 } 2407 2408 static void pcm_release_private(struct snd_pcm_substream *substream) 2409 { 2410 if (snd_pcm_stream_linked(substream)) 2411 snd_pcm_unlink(substream); 2412 } 2413 2414 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2415 { 2416 substream->ref_count--; 2417 if (substream->ref_count > 0) 2418 return; 2419 2420 snd_pcm_drop(substream); 2421 if (substream->hw_opened) { 2422 if (substream->ops->hw_free && 2423 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2424 substream->ops->hw_free(substream); 2425 substream->ops->close(substream); 2426 substream->hw_opened = 0; 2427 } 2428 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2429 pm_qos_remove_request(&substream->latency_pm_qos_req); 2430 if (substream->pcm_release) { 2431 substream->pcm_release(substream); 2432 substream->pcm_release = NULL; 2433 } 2434 snd_pcm_detach_substream(substream); 2435 } 2436 EXPORT_SYMBOL(snd_pcm_release_substream); 2437 2438 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2439 struct file *file, 2440 struct snd_pcm_substream **rsubstream) 2441 { 2442 struct snd_pcm_substream *substream; 2443 int err; 2444 2445 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2446 if (err < 0) 2447 return err; 2448 if (substream->ref_count > 1) { 2449 *rsubstream = substream; 2450 return 0; 2451 } 2452 2453 err = snd_pcm_hw_constraints_init(substream); 2454 if (err < 0) { 2455 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2456 goto error; 2457 } 2458 2459 if ((err = substream->ops->open(substream)) < 0) 2460 goto error; 2461 2462 substream->hw_opened = 1; 2463 2464 err = snd_pcm_hw_constraints_complete(substream); 2465 if (err < 0) { 2466 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2467 goto error; 2468 } 2469 2470 *rsubstream = substream; 2471 return 0; 2472 2473 error: 2474 snd_pcm_release_substream(substream); 2475 return err; 2476 } 2477 EXPORT_SYMBOL(snd_pcm_open_substream); 2478 2479 static int snd_pcm_open_file(struct file *file, 2480 struct snd_pcm *pcm, 2481 int stream) 2482 { 2483 struct snd_pcm_file *pcm_file; 2484 struct snd_pcm_substream *substream; 2485 int err; 2486 2487 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2488 if (err < 0) 2489 return err; 2490 2491 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2492 if (pcm_file == NULL) { 2493 snd_pcm_release_substream(substream); 2494 return -ENOMEM; 2495 } 2496 pcm_file->substream = substream; 2497 if (substream->ref_count == 1) 2498 substream->pcm_release = pcm_release_private; 2499 file->private_data = pcm_file; 2500 2501 return 0; 2502 } 2503 2504 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2505 { 2506 struct snd_pcm *pcm; 2507 int err = nonseekable_open(inode, file); 2508 if (err < 0) 2509 return err; 2510 pcm = snd_lookup_minor_data(iminor(inode), 2511 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2512 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2513 if (pcm) 2514 snd_card_unref(pcm->card); 2515 return err; 2516 } 2517 2518 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2519 { 2520 struct snd_pcm *pcm; 2521 int err = nonseekable_open(inode, file); 2522 if (err < 0) 2523 return err; 2524 pcm = snd_lookup_minor_data(iminor(inode), 2525 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2526 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2527 if (pcm) 2528 snd_card_unref(pcm->card); 2529 return err; 2530 } 2531 2532 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2533 { 2534 int err; 2535 wait_queue_entry_t wait; 2536 2537 if (pcm == NULL) { 2538 err = -ENODEV; 2539 goto __error1; 2540 } 2541 err = snd_card_file_add(pcm->card, file); 2542 if (err < 0) 2543 goto __error1; 2544 if (!try_module_get(pcm->card->module)) { 2545 err = -EFAULT; 2546 goto __error2; 2547 } 2548 init_waitqueue_entry(&wait, current); 2549 add_wait_queue(&pcm->open_wait, &wait); 2550 mutex_lock(&pcm->open_mutex); 2551 while (1) { 2552 err = snd_pcm_open_file(file, pcm, stream); 2553 if (err >= 0) 2554 break; 2555 if (err == -EAGAIN) { 2556 if (file->f_flags & O_NONBLOCK) { 2557 err = -EBUSY; 2558 break; 2559 } 2560 } else 2561 break; 2562 set_current_state(TASK_INTERRUPTIBLE); 2563 mutex_unlock(&pcm->open_mutex); 2564 schedule(); 2565 mutex_lock(&pcm->open_mutex); 2566 if (pcm->card->shutdown) { 2567 err = -ENODEV; 2568 break; 2569 } 2570 if (signal_pending(current)) { 2571 err = -ERESTARTSYS; 2572 break; 2573 } 2574 } 2575 remove_wait_queue(&pcm->open_wait, &wait); 2576 mutex_unlock(&pcm->open_mutex); 2577 if (err < 0) 2578 goto __error; 2579 return err; 2580 2581 __error: 2582 module_put(pcm->card->module); 2583 __error2: 2584 snd_card_file_remove(pcm->card, file); 2585 __error1: 2586 return err; 2587 } 2588 2589 static int snd_pcm_release(struct inode *inode, struct file *file) 2590 { 2591 struct snd_pcm *pcm; 2592 struct snd_pcm_substream *substream; 2593 struct snd_pcm_file *pcm_file; 2594 2595 pcm_file = file->private_data; 2596 substream = pcm_file->substream; 2597 if (snd_BUG_ON(!substream)) 2598 return -ENXIO; 2599 pcm = substream->pcm; 2600 mutex_lock(&pcm->open_mutex); 2601 snd_pcm_release_substream(substream); 2602 kfree(pcm_file); 2603 mutex_unlock(&pcm->open_mutex); 2604 wake_up(&pcm->open_wait); 2605 module_put(pcm->card->module); 2606 snd_card_file_remove(pcm->card, file); 2607 return 0; 2608 } 2609 2610 /* check and update PCM state; return 0 or a negative error 2611 * call this inside PCM lock 2612 */ 2613 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2614 { 2615 switch (substream->runtime->status->state) { 2616 case SNDRV_PCM_STATE_DRAINING: 2617 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2618 return -EBADFD; 2619 /* Fall through */ 2620 case SNDRV_PCM_STATE_RUNNING: 2621 return snd_pcm_update_hw_ptr(substream); 2622 case SNDRV_PCM_STATE_PREPARED: 2623 case SNDRV_PCM_STATE_PAUSED: 2624 return 0; 2625 case SNDRV_PCM_STATE_SUSPENDED: 2626 return -ESTRPIPE; 2627 case SNDRV_PCM_STATE_XRUN: 2628 return -EPIPE; 2629 default: 2630 return -EBADFD; 2631 } 2632 } 2633 2634 /* increase the appl_ptr; returns the processed frames or a negative error */ 2635 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2636 snd_pcm_uframes_t frames, 2637 snd_pcm_sframes_t avail) 2638 { 2639 struct snd_pcm_runtime *runtime = substream->runtime; 2640 snd_pcm_sframes_t appl_ptr; 2641 int ret; 2642 2643 if (avail <= 0) 2644 return 0; 2645 if (frames > (snd_pcm_uframes_t)avail) 2646 frames = avail; 2647 appl_ptr = runtime->control->appl_ptr + frames; 2648 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2649 appl_ptr -= runtime->boundary; 2650 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2651 return ret < 0 ? ret : frames; 2652 } 2653 2654 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2655 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2656 snd_pcm_uframes_t frames, 2657 snd_pcm_sframes_t avail) 2658 { 2659 struct snd_pcm_runtime *runtime = substream->runtime; 2660 snd_pcm_sframes_t appl_ptr; 2661 int ret; 2662 2663 if (avail <= 0) 2664 return 0; 2665 if (frames > (snd_pcm_uframes_t)avail) 2666 frames = avail; 2667 appl_ptr = runtime->control->appl_ptr - frames; 2668 if (appl_ptr < 0) 2669 appl_ptr += runtime->boundary; 2670 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2671 /* NOTE: we return zero for errors because PulseAudio gets depressed 2672 * upon receiving an error from rewind ioctl and stops processing 2673 * any longer. Returning zero means that no rewind is done, so 2674 * it's not absolutely wrong to answer like that. 2675 */ 2676 return ret < 0 ? 0 : frames; 2677 } 2678 2679 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2680 snd_pcm_uframes_t frames) 2681 { 2682 snd_pcm_sframes_t ret; 2683 2684 if (frames == 0) 2685 return 0; 2686 2687 snd_pcm_stream_lock_irq(substream); 2688 ret = do_pcm_hwsync(substream); 2689 if (!ret) 2690 ret = rewind_appl_ptr(substream, frames, 2691 snd_pcm_hw_avail(substream)); 2692 snd_pcm_stream_unlock_irq(substream); 2693 return ret; 2694 } 2695 2696 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2697 snd_pcm_uframes_t frames) 2698 { 2699 snd_pcm_sframes_t ret; 2700 2701 if (frames == 0) 2702 return 0; 2703 2704 snd_pcm_stream_lock_irq(substream); 2705 ret = do_pcm_hwsync(substream); 2706 if (!ret) 2707 ret = forward_appl_ptr(substream, frames, 2708 snd_pcm_avail(substream)); 2709 snd_pcm_stream_unlock_irq(substream); 2710 return ret; 2711 } 2712 2713 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2714 { 2715 int err; 2716 2717 snd_pcm_stream_lock_irq(substream); 2718 err = do_pcm_hwsync(substream); 2719 snd_pcm_stream_unlock_irq(substream); 2720 return err; 2721 } 2722 2723 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2724 snd_pcm_sframes_t *delay) 2725 { 2726 int err; 2727 snd_pcm_sframes_t n = 0; 2728 2729 snd_pcm_stream_lock_irq(substream); 2730 err = do_pcm_hwsync(substream); 2731 if (!err) 2732 n = snd_pcm_calc_delay(substream); 2733 snd_pcm_stream_unlock_irq(substream); 2734 if (!err) 2735 *delay = n; 2736 return err; 2737 } 2738 2739 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2740 struct snd_pcm_sync_ptr __user *_sync_ptr) 2741 { 2742 struct snd_pcm_runtime *runtime = substream->runtime; 2743 struct snd_pcm_sync_ptr sync_ptr; 2744 volatile struct snd_pcm_mmap_status *status; 2745 volatile struct snd_pcm_mmap_control *control; 2746 int err; 2747 2748 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2749 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2750 return -EFAULT; 2751 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2752 return -EFAULT; 2753 status = runtime->status; 2754 control = runtime->control; 2755 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2756 err = snd_pcm_hwsync(substream); 2757 if (err < 0) 2758 return err; 2759 } 2760 snd_pcm_stream_lock_irq(substream); 2761 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2762 err = pcm_lib_apply_appl_ptr(substream, 2763 sync_ptr.c.control.appl_ptr); 2764 if (err < 0) { 2765 snd_pcm_stream_unlock_irq(substream); 2766 return err; 2767 } 2768 } else { 2769 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2770 } 2771 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2772 control->avail_min = sync_ptr.c.control.avail_min; 2773 else 2774 sync_ptr.c.control.avail_min = control->avail_min; 2775 sync_ptr.s.status.state = status->state; 2776 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2777 sync_ptr.s.status.tstamp = status->tstamp; 2778 sync_ptr.s.status.suspended_state = status->suspended_state; 2779 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2780 snd_pcm_stream_unlock_irq(substream); 2781 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2782 return -EFAULT; 2783 return 0; 2784 } 2785 2786 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2787 { 2788 struct snd_pcm_runtime *runtime = substream->runtime; 2789 int arg; 2790 2791 if (get_user(arg, _arg)) 2792 return -EFAULT; 2793 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2794 return -EINVAL; 2795 runtime->tstamp_type = arg; 2796 return 0; 2797 } 2798 2799 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2800 struct snd_xferi __user *_xferi) 2801 { 2802 struct snd_xferi xferi; 2803 struct snd_pcm_runtime *runtime = substream->runtime; 2804 snd_pcm_sframes_t result; 2805 2806 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2807 return -EBADFD; 2808 if (put_user(0, &_xferi->result)) 2809 return -EFAULT; 2810 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2811 return -EFAULT; 2812 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2813 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2814 else 2815 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2816 __put_user(result, &_xferi->result); 2817 return result < 0 ? result : 0; 2818 } 2819 2820 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2821 struct snd_xfern __user *_xfern) 2822 { 2823 struct snd_xfern xfern; 2824 struct snd_pcm_runtime *runtime = substream->runtime; 2825 void *bufs; 2826 snd_pcm_sframes_t result; 2827 2828 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2829 return -EBADFD; 2830 if (runtime->channels > 128) 2831 return -EINVAL; 2832 if (put_user(0, &_xfern->result)) 2833 return -EFAULT; 2834 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2835 return -EFAULT; 2836 2837 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2838 if (IS_ERR(bufs)) 2839 return PTR_ERR(bufs); 2840 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2841 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2842 else 2843 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2844 kfree(bufs); 2845 __put_user(result, &_xfern->result); 2846 return result < 0 ? result : 0; 2847 } 2848 2849 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2850 snd_pcm_uframes_t __user *_frames) 2851 { 2852 snd_pcm_uframes_t frames; 2853 snd_pcm_sframes_t result; 2854 2855 if (get_user(frames, _frames)) 2856 return -EFAULT; 2857 if (put_user(0, _frames)) 2858 return -EFAULT; 2859 result = snd_pcm_rewind(substream, frames); 2860 __put_user(result, _frames); 2861 return result < 0 ? result : 0; 2862 } 2863 2864 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2865 snd_pcm_uframes_t __user *_frames) 2866 { 2867 snd_pcm_uframes_t frames; 2868 snd_pcm_sframes_t result; 2869 2870 if (get_user(frames, _frames)) 2871 return -EFAULT; 2872 if (put_user(0, _frames)) 2873 return -EFAULT; 2874 result = snd_pcm_forward(substream, frames); 2875 __put_user(result, _frames); 2876 return result < 0 ? result : 0; 2877 } 2878 2879 static int snd_pcm_common_ioctl(struct file *file, 2880 struct snd_pcm_substream *substream, 2881 unsigned int cmd, void __user *arg) 2882 { 2883 struct snd_pcm_file *pcm_file = file->private_data; 2884 int res; 2885 2886 if (PCM_RUNTIME_CHECK(substream)) 2887 return -ENXIO; 2888 2889 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2890 if (res < 0) 2891 return res; 2892 2893 switch (cmd) { 2894 case SNDRV_PCM_IOCTL_PVERSION: 2895 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2896 case SNDRV_PCM_IOCTL_INFO: 2897 return snd_pcm_info_user(substream, arg); 2898 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2899 return 0; 2900 case SNDRV_PCM_IOCTL_TTSTAMP: 2901 return snd_pcm_tstamp(substream, arg); 2902 case SNDRV_PCM_IOCTL_USER_PVERSION: 2903 if (get_user(pcm_file->user_pversion, 2904 (unsigned int __user *)arg)) 2905 return -EFAULT; 2906 return 0; 2907 case SNDRV_PCM_IOCTL_HW_REFINE: 2908 return snd_pcm_hw_refine_user(substream, arg); 2909 case SNDRV_PCM_IOCTL_HW_PARAMS: 2910 return snd_pcm_hw_params_user(substream, arg); 2911 case SNDRV_PCM_IOCTL_HW_FREE: 2912 return snd_pcm_hw_free(substream); 2913 case SNDRV_PCM_IOCTL_SW_PARAMS: 2914 return snd_pcm_sw_params_user(substream, arg); 2915 case SNDRV_PCM_IOCTL_STATUS: 2916 return snd_pcm_status_user(substream, arg, false); 2917 case SNDRV_PCM_IOCTL_STATUS_EXT: 2918 return snd_pcm_status_user(substream, arg, true); 2919 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2920 return snd_pcm_channel_info_user(substream, arg); 2921 case SNDRV_PCM_IOCTL_PREPARE: 2922 return snd_pcm_prepare(substream, file); 2923 case SNDRV_PCM_IOCTL_RESET: 2924 return snd_pcm_reset(substream); 2925 case SNDRV_PCM_IOCTL_START: 2926 return snd_pcm_start_lock_irq(substream); 2927 case SNDRV_PCM_IOCTL_LINK: 2928 return snd_pcm_link(substream, (int)(unsigned long) arg); 2929 case SNDRV_PCM_IOCTL_UNLINK: 2930 return snd_pcm_unlink(substream); 2931 case SNDRV_PCM_IOCTL_RESUME: 2932 return snd_pcm_resume(substream); 2933 case SNDRV_PCM_IOCTL_XRUN: 2934 return snd_pcm_xrun(substream); 2935 case SNDRV_PCM_IOCTL_HWSYNC: 2936 return snd_pcm_hwsync(substream); 2937 case SNDRV_PCM_IOCTL_DELAY: 2938 { 2939 snd_pcm_sframes_t delay; 2940 snd_pcm_sframes_t __user *res = arg; 2941 int err; 2942 2943 err = snd_pcm_delay(substream, &delay); 2944 if (err) 2945 return err; 2946 if (put_user(delay, res)) 2947 return -EFAULT; 2948 return 0; 2949 } 2950 case SNDRV_PCM_IOCTL_SYNC_PTR: 2951 return snd_pcm_sync_ptr(substream, arg); 2952 #ifdef CONFIG_SND_SUPPORT_OLD_API 2953 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2954 return snd_pcm_hw_refine_old_user(substream, arg); 2955 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2956 return snd_pcm_hw_params_old_user(substream, arg); 2957 #endif 2958 case SNDRV_PCM_IOCTL_DRAIN: 2959 return snd_pcm_drain(substream, file); 2960 case SNDRV_PCM_IOCTL_DROP: 2961 return snd_pcm_drop(substream); 2962 case SNDRV_PCM_IOCTL_PAUSE: 2963 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2964 substream, 2965 (int)(unsigned long)arg); 2966 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2967 case SNDRV_PCM_IOCTL_READI_FRAMES: 2968 return snd_pcm_xferi_frames_ioctl(substream, arg); 2969 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2970 case SNDRV_PCM_IOCTL_READN_FRAMES: 2971 return snd_pcm_xfern_frames_ioctl(substream, arg); 2972 case SNDRV_PCM_IOCTL_REWIND: 2973 return snd_pcm_rewind_ioctl(substream, arg); 2974 case SNDRV_PCM_IOCTL_FORWARD: 2975 return snd_pcm_forward_ioctl(substream, arg); 2976 } 2977 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2978 return -ENOTTY; 2979 } 2980 2981 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 2982 unsigned long arg) 2983 { 2984 struct snd_pcm_file *pcm_file; 2985 2986 pcm_file = file->private_data; 2987 2988 if (((cmd >> 8) & 0xff) != 'A') 2989 return -ENOTTY; 2990 2991 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 2992 (void __user *)arg); 2993 } 2994 2995 /** 2996 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 2997 * @substream: PCM substream 2998 * @cmd: IOCTL cmd 2999 * @arg: IOCTL argument 3000 * 3001 * The function is provided primarily for OSS layer and USB gadget drivers, 3002 * and it allows only the limited set of ioctls (hw_params, sw_params, 3003 * prepare, start, drain, drop, forward). 3004 */ 3005 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3006 unsigned int cmd, void *arg) 3007 { 3008 snd_pcm_uframes_t *frames = arg; 3009 snd_pcm_sframes_t result; 3010 3011 switch (cmd) { 3012 case SNDRV_PCM_IOCTL_FORWARD: 3013 { 3014 /* provided only for OSS; capture-only and no value returned */ 3015 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3016 return -EINVAL; 3017 result = snd_pcm_forward(substream, *frames); 3018 return result < 0 ? result : 0; 3019 } 3020 case SNDRV_PCM_IOCTL_HW_PARAMS: 3021 return snd_pcm_hw_params(substream, arg); 3022 case SNDRV_PCM_IOCTL_SW_PARAMS: 3023 return snd_pcm_sw_params(substream, arg); 3024 case SNDRV_PCM_IOCTL_PREPARE: 3025 return snd_pcm_prepare(substream, NULL); 3026 case SNDRV_PCM_IOCTL_START: 3027 return snd_pcm_start_lock_irq(substream); 3028 case SNDRV_PCM_IOCTL_DRAIN: 3029 return snd_pcm_drain(substream, NULL); 3030 case SNDRV_PCM_IOCTL_DROP: 3031 return snd_pcm_drop(substream); 3032 case SNDRV_PCM_IOCTL_DELAY: 3033 return snd_pcm_delay(substream, frames); 3034 default: 3035 return -EINVAL; 3036 } 3037 } 3038 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3039 3040 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3041 loff_t * offset) 3042 { 3043 struct snd_pcm_file *pcm_file; 3044 struct snd_pcm_substream *substream; 3045 struct snd_pcm_runtime *runtime; 3046 snd_pcm_sframes_t result; 3047 3048 pcm_file = file->private_data; 3049 substream = pcm_file->substream; 3050 if (PCM_RUNTIME_CHECK(substream)) 3051 return -ENXIO; 3052 runtime = substream->runtime; 3053 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3054 return -EBADFD; 3055 if (!frame_aligned(runtime, count)) 3056 return -EINVAL; 3057 count = bytes_to_frames(runtime, count); 3058 result = snd_pcm_lib_read(substream, buf, count); 3059 if (result > 0) 3060 result = frames_to_bytes(runtime, result); 3061 return result; 3062 } 3063 3064 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3065 size_t count, loff_t * offset) 3066 { 3067 struct snd_pcm_file *pcm_file; 3068 struct snd_pcm_substream *substream; 3069 struct snd_pcm_runtime *runtime; 3070 snd_pcm_sframes_t result; 3071 3072 pcm_file = file->private_data; 3073 substream = pcm_file->substream; 3074 if (PCM_RUNTIME_CHECK(substream)) 3075 return -ENXIO; 3076 runtime = substream->runtime; 3077 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3078 return -EBADFD; 3079 if (!frame_aligned(runtime, count)) 3080 return -EINVAL; 3081 count = bytes_to_frames(runtime, count); 3082 result = snd_pcm_lib_write(substream, buf, count); 3083 if (result > 0) 3084 result = frames_to_bytes(runtime, result); 3085 return result; 3086 } 3087 3088 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3089 { 3090 struct snd_pcm_file *pcm_file; 3091 struct snd_pcm_substream *substream; 3092 struct snd_pcm_runtime *runtime; 3093 snd_pcm_sframes_t result; 3094 unsigned long i; 3095 void __user **bufs; 3096 snd_pcm_uframes_t frames; 3097 3098 pcm_file = iocb->ki_filp->private_data; 3099 substream = pcm_file->substream; 3100 if (PCM_RUNTIME_CHECK(substream)) 3101 return -ENXIO; 3102 runtime = substream->runtime; 3103 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3104 return -EBADFD; 3105 if (!iter_is_iovec(to)) 3106 return -EINVAL; 3107 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3108 return -EINVAL; 3109 if (!frame_aligned(runtime, to->iov->iov_len)) 3110 return -EINVAL; 3111 frames = bytes_to_samples(runtime, to->iov->iov_len); 3112 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3113 if (bufs == NULL) 3114 return -ENOMEM; 3115 for (i = 0; i < to->nr_segs; ++i) 3116 bufs[i] = to->iov[i].iov_base; 3117 result = snd_pcm_lib_readv(substream, bufs, frames); 3118 if (result > 0) 3119 result = frames_to_bytes(runtime, result); 3120 kfree(bufs); 3121 return result; 3122 } 3123 3124 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3125 { 3126 struct snd_pcm_file *pcm_file; 3127 struct snd_pcm_substream *substream; 3128 struct snd_pcm_runtime *runtime; 3129 snd_pcm_sframes_t result; 3130 unsigned long i; 3131 void __user **bufs; 3132 snd_pcm_uframes_t frames; 3133 3134 pcm_file = iocb->ki_filp->private_data; 3135 substream = pcm_file->substream; 3136 if (PCM_RUNTIME_CHECK(substream)) 3137 return -ENXIO; 3138 runtime = substream->runtime; 3139 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3140 return -EBADFD; 3141 if (!iter_is_iovec(from)) 3142 return -EINVAL; 3143 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3144 !frame_aligned(runtime, from->iov->iov_len)) 3145 return -EINVAL; 3146 frames = bytes_to_samples(runtime, from->iov->iov_len); 3147 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3148 if (bufs == NULL) 3149 return -ENOMEM; 3150 for (i = 0; i < from->nr_segs; ++i) 3151 bufs[i] = from->iov[i].iov_base; 3152 result = snd_pcm_lib_writev(substream, bufs, frames); 3153 if (result > 0) 3154 result = frames_to_bytes(runtime, result); 3155 kfree(bufs); 3156 return result; 3157 } 3158 3159 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3160 { 3161 struct snd_pcm_file *pcm_file; 3162 struct snd_pcm_substream *substream; 3163 struct snd_pcm_runtime *runtime; 3164 __poll_t mask, ok; 3165 snd_pcm_uframes_t avail; 3166 3167 pcm_file = file->private_data; 3168 3169 substream = pcm_file->substream; 3170 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3171 ok = EPOLLOUT | EPOLLWRNORM; 3172 else 3173 ok = EPOLLIN | EPOLLRDNORM; 3174 if (PCM_RUNTIME_CHECK(substream)) 3175 return ok | EPOLLERR; 3176 3177 runtime = substream->runtime; 3178 poll_wait(file, &runtime->sleep, wait); 3179 3180 mask = 0; 3181 snd_pcm_stream_lock_irq(substream); 3182 avail = snd_pcm_avail(substream); 3183 switch (runtime->status->state) { 3184 case SNDRV_PCM_STATE_RUNNING: 3185 case SNDRV_PCM_STATE_PREPARED: 3186 case SNDRV_PCM_STATE_PAUSED: 3187 if (avail >= runtime->control->avail_min) 3188 mask = ok; 3189 break; 3190 case SNDRV_PCM_STATE_DRAINING: 3191 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3192 mask = ok; 3193 if (!avail) 3194 mask |= EPOLLERR; 3195 } 3196 break; 3197 default: 3198 mask = ok | EPOLLERR; 3199 break; 3200 } 3201 snd_pcm_stream_unlock_irq(substream); 3202 return mask; 3203 } 3204 3205 /* 3206 * mmap support 3207 */ 3208 3209 /* 3210 * Only on coherent architectures, we can mmap the status and the control records 3211 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3212 */ 3213 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3214 /* 3215 * mmap status record 3216 */ 3217 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3218 { 3219 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3220 struct snd_pcm_runtime *runtime; 3221 3222 if (substream == NULL) 3223 return VM_FAULT_SIGBUS; 3224 runtime = substream->runtime; 3225 vmf->page = virt_to_page(runtime->status); 3226 get_page(vmf->page); 3227 return 0; 3228 } 3229 3230 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3231 { 3232 .fault = snd_pcm_mmap_status_fault, 3233 }; 3234 3235 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3236 struct vm_area_struct *area) 3237 { 3238 long size; 3239 if (!(area->vm_flags & VM_READ)) 3240 return -EINVAL; 3241 size = area->vm_end - area->vm_start; 3242 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3243 return -EINVAL; 3244 area->vm_ops = &snd_pcm_vm_ops_status; 3245 area->vm_private_data = substream; 3246 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3247 return 0; 3248 } 3249 3250 /* 3251 * mmap control record 3252 */ 3253 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3254 { 3255 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3256 struct snd_pcm_runtime *runtime; 3257 3258 if (substream == NULL) 3259 return VM_FAULT_SIGBUS; 3260 runtime = substream->runtime; 3261 vmf->page = virt_to_page(runtime->control); 3262 get_page(vmf->page); 3263 return 0; 3264 } 3265 3266 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3267 { 3268 .fault = snd_pcm_mmap_control_fault, 3269 }; 3270 3271 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3272 struct vm_area_struct *area) 3273 { 3274 long size; 3275 if (!(area->vm_flags & VM_READ)) 3276 return -EINVAL; 3277 size = area->vm_end - area->vm_start; 3278 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3279 return -EINVAL; 3280 area->vm_ops = &snd_pcm_vm_ops_control; 3281 area->vm_private_data = substream; 3282 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3283 return 0; 3284 } 3285 3286 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3287 { 3288 if (pcm_file->no_compat_mmap) 3289 return false; 3290 /* See pcm_control_mmap_allowed() below. 3291 * Since older alsa-lib requires both status and control mmaps to be 3292 * coupled, we have to disable the status mmap for old alsa-lib, too. 3293 */ 3294 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3295 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3296 return false; 3297 return true; 3298 } 3299 3300 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3301 { 3302 if (pcm_file->no_compat_mmap) 3303 return false; 3304 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3305 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3306 * thus it effectively assures the manual update of appl_ptr. 3307 */ 3308 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3309 return false; 3310 return true; 3311 } 3312 3313 #else /* ! coherent mmap */ 3314 /* 3315 * don't support mmap for status and control records. 3316 */ 3317 #define pcm_status_mmap_allowed(pcm_file) false 3318 #define pcm_control_mmap_allowed(pcm_file) false 3319 3320 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3321 struct vm_area_struct *area) 3322 { 3323 return -ENXIO; 3324 } 3325 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3326 struct vm_area_struct *area) 3327 { 3328 return -ENXIO; 3329 } 3330 #endif /* coherent mmap */ 3331 3332 static inline struct page * 3333 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3334 { 3335 void *vaddr = substream->runtime->dma_area + ofs; 3336 return virt_to_page(vaddr); 3337 } 3338 3339 /* 3340 * fault callback for mmapping a RAM page 3341 */ 3342 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3343 { 3344 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3345 struct snd_pcm_runtime *runtime; 3346 unsigned long offset; 3347 struct page * page; 3348 size_t dma_bytes; 3349 3350 if (substream == NULL) 3351 return VM_FAULT_SIGBUS; 3352 runtime = substream->runtime; 3353 offset = vmf->pgoff << PAGE_SHIFT; 3354 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3355 if (offset > dma_bytes - PAGE_SIZE) 3356 return VM_FAULT_SIGBUS; 3357 if (substream->ops->page) 3358 page = substream->ops->page(substream, offset); 3359 else 3360 page = snd_pcm_default_page_ops(substream, offset); 3361 if (!page) 3362 return VM_FAULT_SIGBUS; 3363 get_page(page); 3364 vmf->page = page; 3365 return 0; 3366 } 3367 3368 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3369 .open = snd_pcm_mmap_data_open, 3370 .close = snd_pcm_mmap_data_close, 3371 }; 3372 3373 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3374 .open = snd_pcm_mmap_data_open, 3375 .close = snd_pcm_mmap_data_close, 3376 .fault = snd_pcm_mmap_data_fault, 3377 }; 3378 3379 /* 3380 * mmap the DMA buffer on RAM 3381 */ 3382 3383 /** 3384 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3385 * @substream: PCM substream 3386 * @area: VMA 3387 * 3388 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3389 * this function is invoked implicitly. 3390 */ 3391 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3392 struct vm_area_struct *area) 3393 { 3394 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3395 #ifdef CONFIG_GENERIC_ALLOCATOR 3396 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3397 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3398 return remap_pfn_range(area, area->vm_start, 3399 substream->dma_buffer.addr >> PAGE_SHIFT, 3400 area->vm_end - area->vm_start, area->vm_page_prot); 3401 } 3402 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3403 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3404 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3405 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3406 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3407 area, 3408 substream->runtime->dma_area, 3409 substream->runtime->dma_addr, 3410 substream->runtime->dma_bytes); 3411 #endif /* CONFIG_X86 */ 3412 /* mmap with fault handler */ 3413 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3414 return 0; 3415 } 3416 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3417 3418 /* 3419 * mmap the DMA buffer on I/O memory area 3420 */ 3421 #if SNDRV_PCM_INFO_MMAP_IOMEM 3422 /** 3423 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3424 * @substream: PCM substream 3425 * @area: VMA 3426 * 3427 * When your hardware uses the iomapped pages as the hardware buffer and 3428 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3429 * is supposed to work only on limited architectures. 3430 */ 3431 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3432 struct vm_area_struct *area) 3433 { 3434 struct snd_pcm_runtime *runtime = substream->runtime; 3435 3436 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3437 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3438 } 3439 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3440 #endif /* SNDRV_PCM_INFO_MMAP */ 3441 3442 /* 3443 * mmap DMA buffer 3444 */ 3445 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3446 struct vm_area_struct *area) 3447 { 3448 struct snd_pcm_runtime *runtime; 3449 long size; 3450 unsigned long offset; 3451 size_t dma_bytes; 3452 int err; 3453 3454 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3455 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3456 return -EINVAL; 3457 } else { 3458 if (!(area->vm_flags & VM_READ)) 3459 return -EINVAL; 3460 } 3461 runtime = substream->runtime; 3462 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3463 return -EBADFD; 3464 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3465 return -ENXIO; 3466 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3467 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3468 return -EINVAL; 3469 size = area->vm_end - area->vm_start; 3470 offset = area->vm_pgoff << PAGE_SHIFT; 3471 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3472 if ((size_t)size > dma_bytes) 3473 return -EINVAL; 3474 if (offset > dma_bytes - size) 3475 return -EINVAL; 3476 3477 area->vm_ops = &snd_pcm_vm_ops_data; 3478 area->vm_private_data = substream; 3479 if (substream->ops->mmap) 3480 err = substream->ops->mmap(substream, area); 3481 else 3482 err = snd_pcm_lib_default_mmap(substream, area); 3483 if (!err) 3484 atomic_inc(&substream->mmap_count); 3485 return err; 3486 } 3487 EXPORT_SYMBOL(snd_pcm_mmap_data); 3488 3489 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3490 { 3491 struct snd_pcm_file * pcm_file; 3492 struct snd_pcm_substream *substream; 3493 unsigned long offset; 3494 3495 pcm_file = file->private_data; 3496 substream = pcm_file->substream; 3497 if (PCM_RUNTIME_CHECK(substream)) 3498 return -ENXIO; 3499 3500 offset = area->vm_pgoff << PAGE_SHIFT; 3501 switch (offset) { 3502 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3503 if (!pcm_status_mmap_allowed(pcm_file)) 3504 return -ENXIO; 3505 return snd_pcm_mmap_status(substream, file, area); 3506 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3507 if (!pcm_control_mmap_allowed(pcm_file)) 3508 return -ENXIO; 3509 return snd_pcm_mmap_control(substream, file, area); 3510 default: 3511 return snd_pcm_mmap_data(substream, file, area); 3512 } 3513 return 0; 3514 } 3515 3516 static int snd_pcm_fasync(int fd, struct file * file, int on) 3517 { 3518 struct snd_pcm_file * pcm_file; 3519 struct snd_pcm_substream *substream; 3520 struct snd_pcm_runtime *runtime; 3521 3522 pcm_file = file->private_data; 3523 substream = pcm_file->substream; 3524 if (PCM_RUNTIME_CHECK(substream)) 3525 return -ENXIO; 3526 runtime = substream->runtime; 3527 return fasync_helper(fd, file, on, &runtime->fasync); 3528 } 3529 3530 /* 3531 * ioctl32 compat 3532 */ 3533 #ifdef CONFIG_COMPAT 3534 #include "pcm_compat.c" 3535 #else 3536 #define snd_pcm_ioctl_compat NULL 3537 #endif 3538 3539 /* 3540 * To be removed helpers to keep binary compatibility 3541 */ 3542 3543 #ifdef CONFIG_SND_SUPPORT_OLD_API 3544 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3545 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3546 3547 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3548 struct snd_pcm_hw_params_old *oparams) 3549 { 3550 unsigned int i; 3551 3552 memset(params, 0, sizeof(*params)); 3553 params->flags = oparams->flags; 3554 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3555 params->masks[i].bits[0] = oparams->masks[i]; 3556 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3557 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3558 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3559 params->info = oparams->info; 3560 params->msbits = oparams->msbits; 3561 params->rate_num = oparams->rate_num; 3562 params->rate_den = oparams->rate_den; 3563 params->fifo_size = oparams->fifo_size; 3564 } 3565 3566 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3567 struct snd_pcm_hw_params *params) 3568 { 3569 unsigned int i; 3570 3571 memset(oparams, 0, sizeof(*oparams)); 3572 oparams->flags = params->flags; 3573 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3574 oparams->masks[i] = params->masks[i].bits[0]; 3575 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3576 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3577 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3578 oparams->info = params->info; 3579 oparams->msbits = params->msbits; 3580 oparams->rate_num = params->rate_num; 3581 oparams->rate_den = params->rate_den; 3582 oparams->fifo_size = params->fifo_size; 3583 } 3584 3585 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3586 struct snd_pcm_hw_params_old __user * _oparams) 3587 { 3588 struct snd_pcm_hw_params *params; 3589 struct snd_pcm_hw_params_old *oparams = NULL; 3590 int err; 3591 3592 params = kmalloc(sizeof(*params), GFP_KERNEL); 3593 if (!params) 3594 return -ENOMEM; 3595 3596 oparams = memdup_user(_oparams, sizeof(*oparams)); 3597 if (IS_ERR(oparams)) { 3598 err = PTR_ERR(oparams); 3599 goto out; 3600 } 3601 snd_pcm_hw_convert_from_old_params(params, oparams); 3602 err = snd_pcm_hw_refine(substream, params); 3603 if (err < 0) 3604 goto out_old; 3605 3606 err = fixup_unreferenced_params(substream, params); 3607 if (err < 0) 3608 goto out_old; 3609 3610 snd_pcm_hw_convert_to_old_params(oparams, params); 3611 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3612 err = -EFAULT; 3613 out_old: 3614 kfree(oparams); 3615 out: 3616 kfree(params); 3617 return err; 3618 } 3619 3620 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3621 struct snd_pcm_hw_params_old __user * _oparams) 3622 { 3623 struct snd_pcm_hw_params *params; 3624 struct snd_pcm_hw_params_old *oparams = NULL; 3625 int err; 3626 3627 params = kmalloc(sizeof(*params), GFP_KERNEL); 3628 if (!params) 3629 return -ENOMEM; 3630 3631 oparams = memdup_user(_oparams, sizeof(*oparams)); 3632 if (IS_ERR(oparams)) { 3633 err = PTR_ERR(oparams); 3634 goto out; 3635 } 3636 3637 snd_pcm_hw_convert_from_old_params(params, oparams); 3638 err = snd_pcm_hw_params(substream, params); 3639 if (err < 0) 3640 goto out_old; 3641 3642 snd_pcm_hw_convert_to_old_params(oparams, params); 3643 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3644 err = -EFAULT; 3645 out_old: 3646 kfree(oparams); 3647 out: 3648 kfree(params); 3649 return err; 3650 } 3651 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3652 3653 #ifndef CONFIG_MMU 3654 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3655 unsigned long addr, 3656 unsigned long len, 3657 unsigned long pgoff, 3658 unsigned long flags) 3659 { 3660 struct snd_pcm_file *pcm_file = file->private_data; 3661 struct snd_pcm_substream *substream = pcm_file->substream; 3662 struct snd_pcm_runtime *runtime = substream->runtime; 3663 unsigned long offset = pgoff << PAGE_SHIFT; 3664 3665 switch (offset) { 3666 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3667 return (unsigned long)runtime->status; 3668 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3669 return (unsigned long)runtime->control; 3670 default: 3671 return (unsigned long)runtime->dma_area + offset; 3672 } 3673 } 3674 #else 3675 # define snd_pcm_get_unmapped_area NULL 3676 #endif 3677 3678 /* 3679 * Register section 3680 */ 3681 3682 const struct file_operations snd_pcm_f_ops[2] = { 3683 { 3684 .owner = THIS_MODULE, 3685 .write = snd_pcm_write, 3686 .write_iter = snd_pcm_writev, 3687 .open = snd_pcm_playback_open, 3688 .release = snd_pcm_release, 3689 .llseek = no_llseek, 3690 .poll = snd_pcm_poll, 3691 .unlocked_ioctl = snd_pcm_ioctl, 3692 .compat_ioctl = snd_pcm_ioctl_compat, 3693 .mmap = snd_pcm_mmap, 3694 .fasync = snd_pcm_fasync, 3695 .get_unmapped_area = snd_pcm_get_unmapped_area, 3696 }, 3697 { 3698 .owner = THIS_MODULE, 3699 .read = snd_pcm_read, 3700 .read_iter = snd_pcm_readv, 3701 .open = snd_pcm_capture_open, 3702 .release = snd_pcm_release, 3703 .llseek = no_llseek, 3704 .poll = snd_pcm_poll, 3705 .unlocked_ioctl = snd_pcm_ioctl, 3706 .compat_ioctl = snd_pcm_ioctl_compat, 3707 .mmap = snd_pcm_mmap, 3708 .fasync = snd_pcm_fasync, 3709 .get_unmapped_area = snd_pcm_get_unmapped_area, 3710 } 3711 }; 3712