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 switch (runtime->status->state) { 1449 case SNDRV_PCM_STATE_SUSPENDED: 1450 return -EBUSY; 1451 /* unresumable PCM state; return -EBUSY for skipping suspend */ 1452 case SNDRV_PCM_STATE_OPEN: 1453 case SNDRV_PCM_STATE_SETUP: 1454 case SNDRV_PCM_STATE_DISCONNECTED: 1455 return -EBUSY; 1456 } 1457 runtime->trigger_master = substream; 1458 return 0; 1459 } 1460 1461 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1462 { 1463 struct snd_pcm_runtime *runtime = substream->runtime; 1464 if (runtime->trigger_master != substream) 1465 return 0; 1466 if (! snd_pcm_running(substream)) 1467 return 0; 1468 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1469 return 0; /* suspend unconditionally */ 1470 } 1471 1472 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1473 { 1474 struct snd_pcm_runtime *runtime = substream->runtime; 1475 snd_pcm_trigger_tstamp(substream); 1476 runtime->status->suspended_state = runtime->status->state; 1477 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1478 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1479 wake_up(&runtime->sleep); 1480 wake_up(&runtime->tsleep); 1481 } 1482 1483 static const struct action_ops snd_pcm_action_suspend = { 1484 .pre_action = snd_pcm_pre_suspend, 1485 .do_action = snd_pcm_do_suspend, 1486 .post_action = snd_pcm_post_suspend 1487 }; 1488 1489 /* 1490 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1491 * @substream: the PCM substream 1492 * 1493 * After this call, all streams are changed to SUSPENDED state. 1494 * 1495 * Return: Zero if successful, or a negative error code. 1496 */ 1497 static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1498 { 1499 int err; 1500 unsigned long flags; 1501 1502 snd_pcm_stream_lock_irqsave(substream, flags); 1503 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1504 snd_pcm_stream_unlock_irqrestore(substream, flags); 1505 return err; 1506 } 1507 1508 /** 1509 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1510 * @pcm: the PCM instance 1511 * 1512 * After this call, all streams are changed to SUSPENDED state. 1513 * 1514 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1515 */ 1516 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1517 { 1518 struct snd_pcm_substream *substream; 1519 int stream, err = 0; 1520 1521 if (! pcm) 1522 return 0; 1523 1524 for (stream = 0; stream < 2; stream++) { 1525 for (substream = pcm->streams[stream].substream; 1526 substream; substream = substream->next) { 1527 /* FIXME: the open/close code should lock this as well */ 1528 if (substream->runtime == NULL) 1529 continue; 1530 1531 /* 1532 * Skip BE dai link PCM's that are internal and may 1533 * not have their substream ops set. 1534 */ 1535 if (!substream->ops) 1536 continue; 1537 1538 err = snd_pcm_suspend(substream); 1539 if (err < 0 && err != -EBUSY) 1540 return err; 1541 } 1542 } 1543 return 0; 1544 } 1545 EXPORT_SYMBOL(snd_pcm_suspend_all); 1546 1547 /* resume */ 1548 1549 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1550 { 1551 struct snd_pcm_runtime *runtime = substream->runtime; 1552 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1553 return -ENOSYS; 1554 runtime->trigger_master = substream; 1555 return 0; 1556 } 1557 1558 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1559 { 1560 struct snd_pcm_runtime *runtime = substream->runtime; 1561 if (runtime->trigger_master != substream) 1562 return 0; 1563 /* DMA not running previously? */ 1564 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1565 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1566 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1567 return 0; 1568 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1569 } 1570 1571 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1572 { 1573 if (substream->runtime->trigger_master == substream && 1574 snd_pcm_running(substream)) 1575 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1576 } 1577 1578 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1579 { 1580 struct snd_pcm_runtime *runtime = substream->runtime; 1581 snd_pcm_trigger_tstamp(substream); 1582 runtime->status->state = runtime->status->suspended_state; 1583 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1584 } 1585 1586 static const struct action_ops snd_pcm_action_resume = { 1587 .pre_action = snd_pcm_pre_resume, 1588 .do_action = snd_pcm_do_resume, 1589 .undo_action = snd_pcm_undo_resume, 1590 .post_action = snd_pcm_post_resume 1591 }; 1592 1593 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1594 { 1595 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1596 } 1597 1598 #else 1599 1600 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1601 { 1602 return -ENOSYS; 1603 } 1604 1605 #endif /* CONFIG_PM */ 1606 1607 /* 1608 * xrun ioctl 1609 * 1610 * Change the RUNNING stream(s) to XRUN state. 1611 */ 1612 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1613 { 1614 struct snd_pcm_runtime *runtime = substream->runtime; 1615 int result; 1616 1617 snd_pcm_stream_lock_irq(substream); 1618 switch (runtime->status->state) { 1619 case SNDRV_PCM_STATE_XRUN: 1620 result = 0; /* already there */ 1621 break; 1622 case SNDRV_PCM_STATE_RUNNING: 1623 __snd_pcm_xrun(substream); 1624 result = 0; 1625 break; 1626 default: 1627 result = -EBADFD; 1628 } 1629 snd_pcm_stream_unlock_irq(substream); 1630 return result; 1631 } 1632 1633 /* 1634 * reset ioctl 1635 */ 1636 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1637 { 1638 struct snd_pcm_runtime *runtime = substream->runtime; 1639 switch (runtime->status->state) { 1640 case SNDRV_PCM_STATE_RUNNING: 1641 case SNDRV_PCM_STATE_PREPARED: 1642 case SNDRV_PCM_STATE_PAUSED: 1643 case SNDRV_PCM_STATE_SUSPENDED: 1644 return 0; 1645 default: 1646 return -EBADFD; 1647 } 1648 } 1649 1650 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1651 { 1652 struct snd_pcm_runtime *runtime = substream->runtime; 1653 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1654 if (err < 0) 1655 return err; 1656 runtime->hw_ptr_base = 0; 1657 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1658 runtime->status->hw_ptr % runtime->period_size; 1659 runtime->silence_start = runtime->status->hw_ptr; 1660 runtime->silence_filled = 0; 1661 return 0; 1662 } 1663 1664 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1665 { 1666 struct snd_pcm_runtime *runtime = substream->runtime; 1667 runtime->control->appl_ptr = runtime->status->hw_ptr; 1668 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1669 runtime->silence_size > 0) 1670 snd_pcm_playback_silence(substream, ULONG_MAX); 1671 } 1672 1673 static const struct action_ops snd_pcm_action_reset = { 1674 .pre_action = snd_pcm_pre_reset, 1675 .do_action = snd_pcm_do_reset, 1676 .post_action = snd_pcm_post_reset 1677 }; 1678 1679 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1680 { 1681 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1682 } 1683 1684 /* 1685 * prepare ioctl 1686 */ 1687 /* we use the second argument for updating f_flags */ 1688 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1689 int f_flags) 1690 { 1691 struct snd_pcm_runtime *runtime = substream->runtime; 1692 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1693 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1694 return -EBADFD; 1695 if (snd_pcm_running(substream)) 1696 return -EBUSY; 1697 substream->f_flags = f_flags; 1698 return 0; 1699 } 1700 1701 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1702 { 1703 int err; 1704 err = substream->ops->prepare(substream); 1705 if (err < 0) 1706 return err; 1707 return snd_pcm_do_reset(substream, 0); 1708 } 1709 1710 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1711 { 1712 struct snd_pcm_runtime *runtime = substream->runtime; 1713 runtime->control->appl_ptr = runtime->status->hw_ptr; 1714 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1715 } 1716 1717 static const struct action_ops snd_pcm_action_prepare = { 1718 .pre_action = snd_pcm_pre_prepare, 1719 .do_action = snd_pcm_do_prepare, 1720 .post_action = snd_pcm_post_prepare 1721 }; 1722 1723 /** 1724 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1725 * @substream: the PCM substream instance 1726 * @file: file to refer f_flags 1727 * 1728 * Return: Zero if successful, or a negative error code. 1729 */ 1730 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1731 struct file *file) 1732 { 1733 int f_flags; 1734 1735 if (file) 1736 f_flags = file->f_flags; 1737 else 1738 f_flags = substream->f_flags; 1739 1740 snd_pcm_stream_lock_irq(substream); 1741 switch (substream->runtime->status->state) { 1742 case SNDRV_PCM_STATE_PAUSED: 1743 snd_pcm_pause(substream, 0); 1744 /* fallthru */ 1745 case SNDRV_PCM_STATE_SUSPENDED: 1746 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1747 break; 1748 } 1749 snd_pcm_stream_unlock_irq(substream); 1750 1751 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1752 substream, f_flags); 1753 } 1754 1755 /* 1756 * drain ioctl 1757 */ 1758 1759 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1760 { 1761 struct snd_pcm_runtime *runtime = substream->runtime; 1762 switch (runtime->status->state) { 1763 case SNDRV_PCM_STATE_OPEN: 1764 case SNDRV_PCM_STATE_DISCONNECTED: 1765 case SNDRV_PCM_STATE_SUSPENDED: 1766 return -EBADFD; 1767 } 1768 runtime->trigger_master = substream; 1769 return 0; 1770 } 1771 1772 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1773 { 1774 struct snd_pcm_runtime *runtime = substream->runtime; 1775 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1776 switch (runtime->status->state) { 1777 case SNDRV_PCM_STATE_PREPARED: 1778 /* start playback stream if possible */ 1779 if (! snd_pcm_playback_empty(substream)) { 1780 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1781 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1782 } else { 1783 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1784 } 1785 break; 1786 case SNDRV_PCM_STATE_RUNNING: 1787 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1788 break; 1789 case SNDRV_PCM_STATE_XRUN: 1790 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1791 break; 1792 default: 1793 break; 1794 } 1795 } else { 1796 /* stop running stream */ 1797 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1798 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1799 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1800 snd_pcm_do_stop(substream, new_state); 1801 snd_pcm_post_stop(substream, new_state); 1802 } 1803 } 1804 1805 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1806 runtime->trigger_master == substream && 1807 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1808 return substream->ops->trigger(substream, 1809 SNDRV_PCM_TRIGGER_DRAIN); 1810 1811 return 0; 1812 } 1813 1814 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1815 { 1816 } 1817 1818 static const struct action_ops snd_pcm_action_drain_init = { 1819 .pre_action = snd_pcm_pre_drain_init, 1820 .do_action = snd_pcm_do_drain_init, 1821 .post_action = snd_pcm_post_drain_init 1822 }; 1823 1824 /* 1825 * Drain the stream(s). 1826 * When the substream is linked, sync until the draining of all playback streams 1827 * is finished. 1828 * After this call, all streams are supposed to be either SETUP or DRAINING 1829 * (capture only) state. 1830 */ 1831 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1832 struct file *file) 1833 { 1834 struct snd_card *card; 1835 struct snd_pcm_runtime *runtime; 1836 struct snd_pcm_substream *s; 1837 struct snd_pcm_group *group; 1838 wait_queue_entry_t wait; 1839 int result = 0; 1840 int nonblock = 0; 1841 1842 card = substream->pcm->card; 1843 runtime = substream->runtime; 1844 1845 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1846 return -EBADFD; 1847 1848 if (file) { 1849 if (file->f_flags & O_NONBLOCK) 1850 nonblock = 1; 1851 } else if (substream->f_flags & O_NONBLOCK) 1852 nonblock = 1; 1853 1854 snd_pcm_stream_lock_irq(substream); 1855 /* resume pause */ 1856 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1857 snd_pcm_pause(substream, 0); 1858 1859 /* pre-start/stop - all running streams are changed to DRAINING state */ 1860 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1861 if (result < 0) 1862 goto unlock; 1863 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1864 if (nonblock) { 1865 result = -EAGAIN; 1866 goto unlock; 1867 } 1868 1869 for (;;) { 1870 long tout; 1871 struct snd_pcm_runtime *to_check; 1872 if (signal_pending(current)) { 1873 result = -ERESTARTSYS; 1874 break; 1875 } 1876 /* find a substream to drain */ 1877 to_check = NULL; 1878 group = snd_pcm_stream_group_ref(substream); 1879 snd_pcm_group_for_each_entry(s, substream) { 1880 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1881 continue; 1882 runtime = s->runtime; 1883 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1884 to_check = runtime; 1885 break; 1886 } 1887 } 1888 snd_pcm_group_unref(group, substream); 1889 if (!to_check) 1890 break; /* all drained */ 1891 init_waitqueue_entry(&wait, current); 1892 add_wait_queue(&to_check->sleep, &wait); 1893 snd_pcm_stream_unlock_irq(substream); 1894 if (runtime->no_period_wakeup) 1895 tout = MAX_SCHEDULE_TIMEOUT; 1896 else { 1897 tout = 10; 1898 if (runtime->rate) { 1899 long t = runtime->period_size * 2 / runtime->rate; 1900 tout = max(t, tout); 1901 } 1902 tout = msecs_to_jiffies(tout * 1000); 1903 } 1904 tout = schedule_timeout_interruptible(tout); 1905 1906 snd_pcm_stream_lock_irq(substream); 1907 group = snd_pcm_stream_group_ref(substream); 1908 snd_pcm_group_for_each_entry(s, substream) { 1909 if (s->runtime == to_check) { 1910 remove_wait_queue(&to_check->sleep, &wait); 1911 break; 1912 } 1913 } 1914 snd_pcm_group_unref(group, substream); 1915 1916 if (card->shutdown) { 1917 result = -ENODEV; 1918 break; 1919 } 1920 if (tout == 0) { 1921 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1922 result = -ESTRPIPE; 1923 else { 1924 dev_dbg(substream->pcm->card->dev, 1925 "playback drain error (DMA or IRQ trouble?)\n"); 1926 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1927 result = -EIO; 1928 } 1929 break; 1930 } 1931 } 1932 1933 unlock: 1934 snd_pcm_stream_unlock_irq(substream); 1935 1936 return result; 1937 } 1938 1939 /* 1940 * drop ioctl 1941 * 1942 * Immediately put all linked substreams into SETUP state. 1943 */ 1944 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1945 { 1946 struct snd_pcm_runtime *runtime; 1947 int result = 0; 1948 1949 if (PCM_RUNTIME_CHECK(substream)) 1950 return -ENXIO; 1951 runtime = substream->runtime; 1952 1953 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1954 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1955 return -EBADFD; 1956 1957 snd_pcm_stream_lock_irq(substream); 1958 /* resume pause */ 1959 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1960 snd_pcm_pause(substream, 0); 1961 1962 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1963 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1964 snd_pcm_stream_unlock_irq(substream); 1965 1966 return result; 1967 } 1968 1969 1970 static bool is_pcm_file(struct file *file) 1971 { 1972 struct inode *inode = file_inode(file); 1973 struct snd_pcm *pcm; 1974 unsigned int minor; 1975 1976 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1977 return false; 1978 minor = iminor(inode); 1979 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 1980 if (!pcm) 1981 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1982 if (!pcm) 1983 return false; 1984 snd_card_unref(pcm->card); 1985 return true; 1986 } 1987 1988 /* 1989 * PCM link handling 1990 */ 1991 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1992 { 1993 int res = 0; 1994 struct snd_pcm_file *pcm_file; 1995 struct snd_pcm_substream *substream1; 1996 struct snd_pcm_group *group, *target_group; 1997 bool nonatomic = substream->pcm->nonatomic; 1998 struct fd f = fdget(fd); 1999 2000 if (!f.file) 2001 return -EBADFD; 2002 if (!is_pcm_file(f.file)) { 2003 res = -EBADFD; 2004 goto _badf; 2005 } 2006 pcm_file = f.file->private_data; 2007 substream1 = pcm_file->substream; 2008 group = kzalloc(sizeof(*group), GFP_KERNEL); 2009 if (!group) { 2010 res = -ENOMEM; 2011 goto _nolock; 2012 } 2013 snd_pcm_group_init(group); 2014 2015 down_write(&snd_pcm_link_rwsem); 2016 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 2017 substream->runtime->status->state != substream1->runtime->status->state || 2018 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2019 res = -EBADFD; 2020 goto _end; 2021 } 2022 if (snd_pcm_stream_linked(substream1)) { 2023 res = -EALREADY; 2024 goto _end; 2025 } 2026 2027 snd_pcm_stream_lock_irq(substream); 2028 if (!snd_pcm_stream_linked(substream)) { 2029 snd_pcm_group_assign(substream, group); 2030 group = NULL; /* assigned, don't free this one below */ 2031 } 2032 target_group = substream->group; 2033 snd_pcm_stream_unlock_irq(substream); 2034 2035 snd_pcm_group_lock_irq(target_group, nonatomic); 2036 snd_pcm_stream_lock(substream1); 2037 snd_pcm_group_assign(substream1, target_group); 2038 snd_pcm_stream_unlock(substream1); 2039 snd_pcm_group_unlock_irq(target_group, nonatomic); 2040 _end: 2041 up_write(&snd_pcm_link_rwsem); 2042 _nolock: 2043 kfree(group); 2044 _badf: 2045 fdput(f); 2046 return res; 2047 } 2048 2049 static void relink_to_local(struct snd_pcm_substream *substream) 2050 { 2051 snd_pcm_stream_lock(substream); 2052 snd_pcm_group_assign(substream, &substream->self_group); 2053 snd_pcm_stream_unlock(substream); 2054 } 2055 2056 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2057 { 2058 struct snd_pcm_group *group; 2059 bool nonatomic = substream->pcm->nonatomic; 2060 bool do_free = false; 2061 int res = 0; 2062 2063 down_write(&snd_pcm_link_rwsem); 2064 2065 if (!snd_pcm_stream_linked(substream)) { 2066 res = -EALREADY; 2067 goto _end; 2068 } 2069 2070 group = substream->group; 2071 snd_pcm_group_lock_irq(group, nonatomic); 2072 2073 relink_to_local(substream); 2074 2075 /* detach the last stream, too */ 2076 if (list_is_singular(&group->substreams)) { 2077 relink_to_local(list_first_entry(&group->substreams, 2078 struct snd_pcm_substream, 2079 link_list)); 2080 do_free = !refcount_read(&group->refs); 2081 } 2082 2083 snd_pcm_group_unlock_irq(group, nonatomic); 2084 if (do_free) 2085 kfree(group); 2086 2087 _end: 2088 up_write(&snd_pcm_link_rwsem); 2089 return res; 2090 } 2091 2092 /* 2093 * hw configurator 2094 */ 2095 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2096 struct snd_pcm_hw_rule *rule) 2097 { 2098 struct snd_interval t; 2099 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2100 hw_param_interval_c(params, rule->deps[1]), &t); 2101 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2102 } 2103 2104 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2105 struct snd_pcm_hw_rule *rule) 2106 { 2107 struct snd_interval t; 2108 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2109 hw_param_interval_c(params, rule->deps[1]), &t); 2110 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2111 } 2112 2113 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2114 struct snd_pcm_hw_rule *rule) 2115 { 2116 struct snd_interval t; 2117 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2118 hw_param_interval_c(params, rule->deps[1]), 2119 (unsigned long) rule->private, &t); 2120 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2121 } 2122 2123 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2124 struct snd_pcm_hw_rule *rule) 2125 { 2126 struct snd_interval t; 2127 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2128 (unsigned long) rule->private, 2129 hw_param_interval_c(params, rule->deps[1]), &t); 2130 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2131 } 2132 2133 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2134 struct snd_pcm_hw_rule *rule) 2135 { 2136 unsigned int k; 2137 const struct snd_interval *i = 2138 hw_param_interval_c(params, rule->deps[0]); 2139 struct snd_mask m; 2140 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2141 snd_mask_any(&m); 2142 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2143 int bits; 2144 if (! snd_mask_test(mask, k)) 2145 continue; 2146 bits = snd_pcm_format_physical_width(k); 2147 if (bits <= 0) 2148 continue; /* ignore invalid formats */ 2149 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2150 snd_mask_reset(&m, k); 2151 } 2152 return snd_mask_refine(mask, &m); 2153 } 2154 2155 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2156 struct snd_pcm_hw_rule *rule) 2157 { 2158 struct snd_interval t; 2159 unsigned int k; 2160 t.min = UINT_MAX; 2161 t.max = 0; 2162 t.openmin = 0; 2163 t.openmax = 0; 2164 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2165 int bits; 2166 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2167 continue; 2168 bits = snd_pcm_format_physical_width(k); 2169 if (bits <= 0) 2170 continue; /* ignore invalid formats */ 2171 if (t.min > (unsigned)bits) 2172 t.min = bits; 2173 if (t.max < (unsigned)bits) 2174 t.max = bits; 2175 } 2176 t.integer = 1; 2177 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2178 } 2179 2180 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2181 #error "Change this table" 2182 #endif 2183 2184 static const unsigned int rates[] = { 2185 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2186 48000, 64000, 88200, 96000, 176400, 192000 2187 }; 2188 2189 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2190 .count = ARRAY_SIZE(rates), 2191 .list = rates, 2192 }; 2193 2194 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2195 struct snd_pcm_hw_rule *rule) 2196 { 2197 struct snd_pcm_hardware *hw = rule->private; 2198 return snd_interval_list(hw_param_interval(params, rule->var), 2199 snd_pcm_known_rates.count, 2200 snd_pcm_known_rates.list, hw->rates); 2201 } 2202 2203 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2204 struct snd_pcm_hw_rule *rule) 2205 { 2206 struct snd_interval t; 2207 struct snd_pcm_substream *substream = rule->private; 2208 t.min = 0; 2209 t.max = substream->buffer_bytes_max; 2210 t.openmin = 0; 2211 t.openmax = 0; 2212 t.integer = 1; 2213 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2214 } 2215 2216 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2217 { 2218 struct snd_pcm_runtime *runtime = substream->runtime; 2219 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2220 int k, err; 2221 2222 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2223 snd_mask_any(constrs_mask(constrs, k)); 2224 } 2225 2226 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2227 snd_interval_any(constrs_interval(constrs, k)); 2228 } 2229 2230 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2231 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2232 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2233 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2234 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2235 2236 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2237 snd_pcm_hw_rule_format, NULL, 2238 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2239 if (err < 0) 2240 return err; 2241 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2242 snd_pcm_hw_rule_sample_bits, NULL, 2243 SNDRV_PCM_HW_PARAM_FORMAT, 2244 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2245 if (err < 0) 2246 return err; 2247 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2248 snd_pcm_hw_rule_div, NULL, 2249 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2250 if (err < 0) 2251 return err; 2252 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2253 snd_pcm_hw_rule_mul, NULL, 2254 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2255 if (err < 0) 2256 return err; 2257 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2258 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2259 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2260 if (err < 0) 2261 return err; 2262 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2263 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2264 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2265 if (err < 0) 2266 return err; 2267 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2268 snd_pcm_hw_rule_div, NULL, 2269 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2270 if (err < 0) 2271 return err; 2272 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2273 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2274 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2275 if (err < 0) 2276 return err; 2277 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2278 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2279 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2280 if (err < 0) 2281 return err; 2282 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2283 snd_pcm_hw_rule_div, NULL, 2284 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2285 if (err < 0) 2286 return err; 2287 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2288 snd_pcm_hw_rule_div, NULL, 2289 SNDRV_PCM_HW_PARAM_BUFFER_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_PERIOD_SIZE, 2293 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2294 SNDRV_PCM_HW_PARAM_PERIOD_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_PERIOD_SIZE, 2298 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2299 SNDRV_PCM_HW_PARAM_PERIOD_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_BUFFER_SIZE, 2303 snd_pcm_hw_rule_mul, NULL, 2304 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2305 if (err < 0) 2306 return err; 2307 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2308 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2309 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 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_BUFFER_SIZE, 2313 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2314 SNDRV_PCM_HW_PARAM_BUFFER_TIME, 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_PERIOD_BYTES, 2318 snd_pcm_hw_rule_muldivk, (void*) 8, 2319 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2320 if (err < 0) 2321 return err; 2322 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2323 snd_pcm_hw_rule_muldivk, (void*) 8, 2324 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2325 if (err < 0) 2326 return err; 2327 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2328 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2329 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2330 if (err < 0) 2331 return err; 2332 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2333 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2334 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2335 if (err < 0) 2336 return err; 2337 return 0; 2338 } 2339 2340 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2341 { 2342 struct snd_pcm_runtime *runtime = substream->runtime; 2343 struct snd_pcm_hardware *hw = &runtime->hw; 2344 int err; 2345 unsigned int mask = 0; 2346 2347 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2348 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2349 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2350 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2351 if (hw_support_mmap(substream)) { 2352 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2353 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2354 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2355 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2356 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2357 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2358 } 2359 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2360 if (err < 0) 2361 return err; 2362 2363 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2364 if (err < 0) 2365 return err; 2366 2367 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2368 if (err < 0) 2369 return err; 2370 2371 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2372 hw->channels_min, hw->channels_max); 2373 if (err < 0) 2374 return err; 2375 2376 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2377 hw->rate_min, hw->rate_max); 2378 if (err < 0) 2379 return err; 2380 2381 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2382 hw->period_bytes_min, hw->period_bytes_max); 2383 if (err < 0) 2384 return err; 2385 2386 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2387 hw->periods_min, hw->periods_max); 2388 if (err < 0) 2389 return err; 2390 2391 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2392 hw->period_bytes_min, hw->buffer_bytes_max); 2393 if (err < 0) 2394 return err; 2395 2396 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2397 snd_pcm_hw_rule_buffer_bytes_max, substream, 2398 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2399 if (err < 0) 2400 return err; 2401 2402 /* FIXME: remove */ 2403 if (runtime->dma_bytes) { 2404 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2405 if (err < 0) 2406 return err; 2407 } 2408 2409 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2410 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2411 snd_pcm_hw_rule_rate, hw, 2412 SNDRV_PCM_HW_PARAM_RATE, -1); 2413 if (err < 0) 2414 return err; 2415 } 2416 2417 /* FIXME: this belong to lowlevel */ 2418 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2419 2420 return 0; 2421 } 2422 2423 static void pcm_release_private(struct snd_pcm_substream *substream) 2424 { 2425 if (snd_pcm_stream_linked(substream)) 2426 snd_pcm_unlink(substream); 2427 } 2428 2429 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2430 { 2431 substream->ref_count--; 2432 if (substream->ref_count > 0) 2433 return; 2434 2435 snd_pcm_drop(substream); 2436 if (substream->hw_opened) { 2437 if (substream->ops->hw_free && 2438 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2439 substream->ops->hw_free(substream); 2440 substream->ops->close(substream); 2441 substream->hw_opened = 0; 2442 } 2443 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2444 pm_qos_remove_request(&substream->latency_pm_qos_req); 2445 if (substream->pcm_release) { 2446 substream->pcm_release(substream); 2447 substream->pcm_release = NULL; 2448 } 2449 snd_pcm_detach_substream(substream); 2450 } 2451 EXPORT_SYMBOL(snd_pcm_release_substream); 2452 2453 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2454 struct file *file, 2455 struct snd_pcm_substream **rsubstream) 2456 { 2457 struct snd_pcm_substream *substream; 2458 int err; 2459 2460 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2461 if (err < 0) 2462 return err; 2463 if (substream->ref_count > 1) { 2464 *rsubstream = substream; 2465 return 0; 2466 } 2467 2468 err = snd_pcm_hw_constraints_init(substream); 2469 if (err < 0) { 2470 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2471 goto error; 2472 } 2473 2474 if ((err = substream->ops->open(substream)) < 0) 2475 goto error; 2476 2477 substream->hw_opened = 1; 2478 2479 err = snd_pcm_hw_constraints_complete(substream); 2480 if (err < 0) { 2481 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2482 goto error; 2483 } 2484 2485 *rsubstream = substream; 2486 return 0; 2487 2488 error: 2489 snd_pcm_release_substream(substream); 2490 return err; 2491 } 2492 EXPORT_SYMBOL(snd_pcm_open_substream); 2493 2494 static int snd_pcm_open_file(struct file *file, 2495 struct snd_pcm *pcm, 2496 int stream) 2497 { 2498 struct snd_pcm_file *pcm_file; 2499 struct snd_pcm_substream *substream; 2500 int err; 2501 2502 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2503 if (err < 0) 2504 return err; 2505 2506 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2507 if (pcm_file == NULL) { 2508 snd_pcm_release_substream(substream); 2509 return -ENOMEM; 2510 } 2511 pcm_file->substream = substream; 2512 if (substream->ref_count == 1) 2513 substream->pcm_release = pcm_release_private; 2514 file->private_data = pcm_file; 2515 2516 return 0; 2517 } 2518 2519 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2520 { 2521 struct snd_pcm *pcm; 2522 int err = nonseekable_open(inode, file); 2523 if (err < 0) 2524 return err; 2525 pcm = snd_lookup_minor_data(iminor(inode), 2526 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2527 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2528 if (pcm) 2529 snd_card_unref(pcm->card); 2530 return err; 2531 } 2532 2533 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2534 { 2535 struct snd_pcm *pcm; 2536 int err = nonseekable_open(inode, file); 2537 if (err < 0) 2538 return err; 2539 pcm = snd_lookup_minor_data(iminor(inode), 2540 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2541 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2542 if (pcm) 2543 snd_card_unref(pcm->card); 2544 return err; 2545 } 2546 2547 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2548 { 2549 int err; 2550 wait_queue_entry_t wait; 2551 2552 if (pcm == NULL) { 2553 err = -ENODEV; 2554 goto __error1; 2555 } 2556 err = snd_card_file_add(pcm->card, file); 2557 if (err < 0) 2558 goto __error1; 2559 if (!try_module_get(pcm->card->module)) { 2560 err = -EFAULT; 2561 goto __error2; 2562 } 2563 init_waitqueue_entry(&wait, current); 2564 add_wait_queue(&pcm->open_wait, &wait); 2565 mutex_lock(&pcm->open_mutex); 2566 while (1) { 2567 err = snd_pcm_open_file(file, pcm, stream); 2568 if (err >= 0) 2569 break; 2570 if (err == -EAGAIN) { 2571 if (file->f_flags & O_NONBLOCK) { 2572 err = -EBUSY; 2573 break; 2574 } 2575 } else 2576 break; 2577 set_current_state(TASK_INTERRUPTIBLE); 2578 mutex_unlock(&pcm->open_mutex); 2579 schedule(); 2580 mutex_lock(&pcm->open_mutex); 2581 if (pcm->card->shutdown) { 2582 err = -ENODEV; 2583 break; 2584 } 2585 if (signal_pending(current)) { 2586 err = -ERESTARTSYS; 2587 break; 2588 } 2589 } 2590 remove_wait_queue(&pcm->open_wait, &wait); 2591 mutex_unlock(&pcm->open_mutex); 2592 if (err < 0) 2593 goto __error; 2594 return err; 2595 2596 __error: 2597 module_put(pcm->card->module); 2598 __error2: 2599 snd_card_file_remove(pcm->card, file); 2600 __error1: 2601 return err; 2602 } 2603 2604 static int snd_pcm_release(struct inode *inode, struct file *file) 2605 { 2606 struct snd_pcm *pcm; 2607 struct snd_pcm_substream *substream; 2608 struct snd_pcm_file *pcm_file; 2609 2610 pcm_file = file->private_data; 2611 substream = pcm_file->substream; 2612 if (snd_BUG_ON(!substream)) 2613 return -ENXIO; 2614 pcm = substream->pcm; 2615 mutex_lock(&pcm->open_mutex); 2616 snd_pcm_release_substream(substream); 2617 kfree(pcm_file); 2618 mutex_unlock(&pcm->open_mutex); 2619 wake_up(&pcm->open_wait); 2620 module_put(pcm->card->module); 2621 snd_card_file_remove(pcm->card, file); 2622 return 0; 2623 } 2624 2625 /* check and update PCM state; return 0 or a negative error 2626 * call this inside PCM lock 2627 */ 2628 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2629 { 2630 switch (substream->runtime->status->state) { 2631 case SNDRV_PCM_STATE_DRAINING: 2632 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2633 return -EBADFD; 2634 /* Fall through */ 2635 case SNDRV_PCM_STATE_RUNNING: 2636 return snd_pcm_update_hw_ptr(substream); 2637 case SNDRV_PCM_STATE_PREPARED: 2638 case SNDRV_PCM_STATE_PAUSED: 2639 return 0; 2640 case SNDRV_PCM_STATE_SUSPENDED: 2641 return -ESTRPIPE; 2642 case SNDRV_PCM_STATE_XRUN: 2643 return -EPIPE; 2644 default: 2645 return -EBADFD; 2646 } 2647 } 2648 2649 /* increase the appl_ptr; returns the processed frames or a negative error */ 2650 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2651 snd_pcm_uframes_t frames, 2652 snd_pcm_sframes_t avail) 2653 { 2654 struct snd_pcm_runtime *runtime = substream->runtime; 2655 snd_pcm_sframes_t appl_ptr; 2656 int ret; 2657 2658 if (avail <= 0) 2659 return 0; 2660 if (frames > (snd_pcm_uframes_t)avail) 2661 frames = avail; 2662 appl_ptr = runtime->control->appl_ptr + frames; 2663 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2664 appl_ptr -= runtime->boundary; 2665 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2666 return ret < 0 ? ret : frames; 2667 } 2668 2669 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2670 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2671 snd_pcm_uframes_t frames, 2672 snd_pcm_sframes_t avail) 2673 { 2674 struct snd_pcm_runtime *runtime = substream->runtime; 2675 snd_pcm_sframes_t appl_ptr; 2676 int ret; 2677 2678 if (avail <= 0) 2679 return 0; 2680 if (frames > (snd_pcm_uframes_t)avail) 2681 frames = avail; 2682 appl_ptr = runtime->control->appl_ptr - frames; 2683 if (appl_ptr < 0) 2684 appl_ptr += runtime->boundary; 2685 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2686 /* NOTE: we return zero for errors because PulseAudio gets depressed 2687 * upon receiving an error from rewind ioctl and stops processing 2688 * any longer. Returning zero means that no rewind is done, so 2689 * it's not absolutely wrong to answer like that. 2690 */ 2691 return ret < 0 ? 0 : frames; 2692 } 2693 2694 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2695 snd_pcm_uframes_t frames) 2696 { 2697 snd_pcm_sframes_t ret; 2698 2699 if (frames == 0) 2700 return 0; 2701 2702 snd_pcm_stream_lock_irq(substream); 2703 ret = do_pcm_hwsync(substream); 2704 if (!ret) 2705 ret = rewind_appl_ptr(substream, frames, 2706 snd_pcm_hw_avail(substream)); 2707 snd_pcm_stream_unlock_irq(substream); 2708 return ret; 2709 } 2710 2711 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2712 snd_pcm_uframes_t frames) 2713 { 2714 snd_pcm_sframes_t ret; 2715 2716 if (frames == 0) 2717 return 0; 2718 2719 snd_pcm_stream_lock_irq(substream); 2720 ret = do_pcm_hwsync(substream); 2721 if (!ret) 2722 ret = forward_appl_ptr(substream, frames, 2723 snd_pcm_avail(substream)); 2724 snd_pcm_stream_unlock_irq(substream); 2725 return ret; 2726 } 2727 2728 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2729 { 2730 int err; 2731 2732 snd_pcm_stream_lock_irq(substream); 2733 err = do_pcm_hwsync(substream); 2734 snd_pcm_stream_unlock_irq(substream); 2735 return err; 2736 } 2737 2738 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2739 snd_pcm_sframes_t *delay) 2740 { 2741 int err; 2742 snd_pcm_sframes_t n = 0; 2743 2744 snd_pcm_stream_lock_irq(substream); 2745 err = do_pcm_hwsync(substream); 2746 if (!err) 2747 n = snd_pcm_calc_delay(substream); 2748 snd_pcm_stream_unlock_irq(substream); 2749 if (!err) 2750 *delay = n; 2751 return err; 2752 } 2753 2754 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2755 struct snd_pcm_sync_ptr __user *_sync_ptr) 2756 { 2757 struct snd_pcm_runtime *runtime = substream->runtime; 2758 struct snd_pcm_sync_ptr sync_ptr; 2759 volatile struct snd_pcm_mmap_status *status; 2760 volatile struct snd_pcm_mmap_control *control; 2761 int err; 2762 2763 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2764 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2765 return -EFAULT; 2766 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2767 return -EFAULT; 2768 status = runtime->status; 2769 control = runtime->control; 2770 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2771 err = snd_pcm_hwsync(substream); 2772 if (err < 0) 2773 return err; 2774 } 2775 snd_pcm_stream_lock_irq(substream); 2776 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2777 err = pcm_lib_apply_appl_ptr(substream, 2778 sync_ptr.c.control.appl_ptr); 2779 if (err < 0) { 2780 snd_pcm_stream_unlock_irq(substream); 2781 return err; 2782 } 2783 } else { 2784 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2785 } 2786 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2787 control->avail_min = sync_ptr.c.control.avail_min; 2788 else 2789 sync_ptr.c.control.avail_min = control->avail_min; 2790 sync_ptr.s.status.state = status->state; 2791 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2792 sync_ptr.s.status.tstamp = status->tstamp; 2793 sync_ptr.s.status.suspended_state = status->suspended_state; 2794 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2795 snd_pcm_stream_unlock_irq(substream); 2796 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2797 return -EFAULT; 2798 return 0; 2799 } 2800 2801 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2802 { 2803 struct snd_pcm_runtime *runtime = substream->runtime; 2804 int arg; 2805 2806 if (get_user(arg, _arg)) 2807 return -EFAULT; 2808 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2809 return -EINVAL; 2810 runtime->tstamp_type = arg; 2811 return 0; 2812 } 2813 2814 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2815 struct snd_xferi __user *_xferi) 2816 { 2817 struct snd_xferi xferi; 2818 struct snd_pcm_runtime *runtime = substream->runtime; 2819 snd_pcm_sframes_t result; 2820 2821 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2822 return -EBADFD; 2823 if (put_user(0, &_xferi->result)) 2824 return -EFAULT; 2825 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2826 return -EFAULT; 2827 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2828 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2829 else 2830 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2831 __put_user(result, &_xferi->result); 2832 return result < 0 ? result : 0; 2833 } 2834 2835 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2836 struct snd_xfern __user *_xfern) 2837 { 2838 struct snd_xfern xfern; 2839 struct snd_pcm_runtime *runtime = substream->runtime; 2840 void *bufs; 2841 snd_pcm_sframes_t result; 2842 2843 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2844 return -EBADFD; 2845 if (runtime->channels > 128) 2846 return -EINVAL; 2847 if (put_user(0, &_xfern->result)) 2848 return -EFAULT; 2849 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2850 return -EFAULT; 2851 2852 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2853 if (IS_ERR(bufs)) 2854 return PTR_ERR(bufs); 2855 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2856 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2857 else 2858 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2859 kfree(bufs); 2860 __put_user(result, &_xfern->result); 2861 return result < 0 ? result : 0; 2862 } 2863 2864 static int snd_pcm_rewind_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_rewind(substream, frames); 2875 __put_user(result, _frames); 2876 return result < 0 ? result : 0; 2877 } 2878 2879 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2880 snd_pcm_uframes_t __user *_frames) 2881 { 2882 snd_pcm_uframes_t frames; 2883 snd_pcm_sframes_t result; 2884 2885 if (get_user(frames, _frames)) 2886 return -EFAULT; 2887 if (put_user(0, _frames)) 2888 return -EFAULT; 2889 result = snd_pcm_forward(substream, frames); 2890 __put_user(result, _frames); 2891 return result < 0 ? result : 0; 2892 } 2893 2894 static int snd_pcm_common_ioctl(struct file *file, 2895 struct snd_pcm_substream *substream, 2896 unsigned int cmd, void __user *arg) 2897 { 2898 struct snd_pcm_file *pcm_file = file->private_data; 2899 int res; 2900 2901 if (PCM_RUNTIME_CHECK(substream)) 2902 return -ENXIO; 2903 2904 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2905 if (res < 0) 2906 return res; 2907 2908 switch (cmd) { 2909 case SNDRV_PCM_IOCTL_PVERSION: 2910 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2911 case SNDRV_PCM_IOCTL_INFO: 2912 return snd_pcm_info_user(substream, arg); 2913 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2914 return 0; 2915 case SNDRV_PCM_IOCTL_TTSTAMP: 2916 return snd_pcm_tstamp(substream, arg); 2917 case SNDRV_PCM_IOCTL_USER_PVERSION: 2918 if (get_user(pcm_file->user_pversion, 2919 (unsigned int __user *)arg)) 2920 return -EFAULT; 2921 return 0; 2922 case SNDRV_PCM_IOCTL_HW_REFINE: 2923 return snd_pcm_hw_refine_user(substream, arg); 2924 case SNDRV_PCM_IOCTL_HW_PARAMS: 2925 return snd_pcm_hw_params_user(substream, arg); 2926 case SNDRV_PCM_IOCTL_HW_FREE: 2927 return snd_pcm_hw_free(substream); 2928 case SNDRV_PCM_IOCTL_SW_PARAMS: 2929 return snd_pcm_sw_params_user(substream, arg); 2930 case SNDRV_PCM_IOCTL_STATUS: 2931 return snd_pcm_status_user(substream, arg, false); 2932 case SNDRV_PCM_IOCTL_STATUS_EXT: 2933 return snd_pcm_status_user(substream, arg, true); 2934 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2935 return snd_pcm_channel_info_user(substream, arg); 2936 case SNDRV_PCM_IOCTL_PREPARE: 2937 return snd_pcm_prepare(substream, file); 2938 case SNDRV_PCM_IOCTL_RESET: 2939 return snd_pcm_reset(substream); 2940 case SNDRV_PCM_IOCTL_START: 2941 return snd_pcm_start_lock_irq(substream); 2942 case SNDRV_PCM_IOCTL_LINK: 2943 return snd_pcm_link(substream, (int)(unsigned long) arg); 2944 case SNDRV_PCM_IOCTL_UNLINK: 2945 return snd_pcm_unlink(substream); 2946 case SNDRV_PCM_IOCTL_RESUME: 2947 return snd_pcm_resume(substream); 2948 case SNDRV_PCM_IOCTL_XRUN: 2949 return snd_pcm_xrun(substream); 2950 case SNDRV_PCM_IOCTL_HWSYNC: 2951 return snd_pcm_hwsync(substream); 2952 case SNDRV_PCM_IOCTL_DELAY: 2953 { 2954 snd_pcm_sframes_t delay; 2955 snd_pcm_sframes_t __user *res = arg; 2956 int err; 2957 2958 err = snd_pcm_delay(substream, &delay); 2959 if (err) 2960 return err; 2961 if (put_user(delay, res)) 2962 return -EFAULT; 2963 return 0; 2964 } 2965 case SNDRV_PCM_IOCTL_SYNC_PTR: 2966 return snd_pcm_sync_ptr(substream, arg); 2967 #ifdef CONFIG_SND_SUPPORT_OLD_API 2968 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2969 return snd_pcm_hw_refine_old_user(substream, arg); 2970 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2971 return snd_pcm_hw_params_old_user(substream, arg); 2972 #endif 2973 case SNDRV_PCM_IOCTL_DRAIN: 2974 return snd_pcm_drain(substream, file); 2975 case SNDRV_PCM_IOCTL_DROP: 2976 return snd_pcm_drop(substream); 2977 case SNDRV_PCM_IOCTL_PAUSE: 2978 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2979 substream, 2980 (int)(unsigned long)arg); 2981 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2982 case SNDRV_PCM_IOCTL_READI_FRAMES: 2983 return snd_pcm_xferi_frames_ioctl(substream, arg); 2984 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2985 case SNDRV_PCM_IOCTL_READN_FRAMES: 2986 return snd_pcm_xfern_frames_ioctl(substream, arg); 2987 case SNDRV_PCM_IOCTL_REWIND: 2988 return snd_pcm_rewind_ioctl(substream, arg); 2989 case SNDRV_PCM_IOCTL_FORWARD: 2990 return snd_pcm_forward_ioctl(substream, arg); 2991 } 2992 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2993 return -ENOTTY; 2994 } 2995 2996 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 2997 unsigned long arg) 2998 { 2999 struct snd_pcm_file *pcm_file; 3000 3001 pcm_file = file->private_data; 3002 3003 if (((cmd >> 8) & 0xff) != 'A') 3004 return -ENOTTY; 3005 3006 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 3007 (void __user *)arg); 3008 } 3009 3010 /** 3011 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3012 * @substream: PCM substream 3013 * @cmd: IOCTL cmd 3014 * @arg: IOCTL argument 3015 * 3016 * The function is provided primarily for OSS layer and USB gadget drivers, 3017 * and it allows only the limited set of ioctls (hw_params, sw_params, 3018 * prepare, start, drain, drop, forward). 3019 */ 3020 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3021 unsigned int cmd, void *arg) 3022 { 3023 snd_pcm_uframes_t *frames = arg; 3024 snd_pcm_sframes_t result; 3025 3026 switch (cmd) { 3027 case SNDRV_PCM_IOCTL_FORWARD: 3028 { 3029 /* provided only for OSS; capture-only and no value returned */ 3030 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3031 return -EINVAL; 3032 result = snd_pcm_forward(substream, *frames); 3033 return result < 0 ? result : 0; 3034 } 3035 case SNDRV_PCM_IOCTL_HW_PARAMS: 3036 return snd_pcm_hw_params(substream, arg); 3037 case SNDRV_PCM_IOCTL_SW_PARAMS: 3038 return snd_pcm_sw_params(substream, arg); 3039 case SNDRV_PCM_IOCTL_PREPARE: 3040 return snd_pcm_prepare(substream, NULL); 3041 case SNDRV_PCM_IOCTL_START: 3042 return snd_pcm_start_lock_irq(substream); 3043 case SNDRV_PCM_IOCTL_DRAIN: 3044 return snd_pcm_drain(substream, NULL); 3045 case SNDRV_PCM_IOCTL_DROP: 3046 return snd_pcm_drop(substream); 3047 case SNDRV_PCM_IOCTL_DELAY: 3048 return snd_pcm_delay(substream, frames); 3049 default: 3050 return -EINVAL; 3051 } 3052 } 3053 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3054 3055 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3056 loff_t * offset) 3057 { 3058 struct snd_pcm_file *pcm_file; 3059 struct snd_pcm_substream *substream; 3060 struct snd_pcm_runtime *runtime; 3061 snd_pcm_sframes_t result; 3062 3063 pcm_file = file->private_data; 3064 substream = pcm_file->substream; 3065 if (PCM_RUNTIME_CHECK(substream)) 3066 return -ENXIO; 3067 runtime = substream->runtime; 3068 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3069 return -EBADFD; 3070 if (!frame_aligned(runtime, count)) 3071 return -EINVAL; 3072 count = bytes_to_frames(runtime, count); 3073 result = snd_pcm_lib_read(substream, buf, count); 3074 if (result > 0) 3075 result = frames_to_bytes(runtime, result); 3076 return result; 3077 } 3078 3079 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3080 size_t count, loff_t * offset) 3081 { 3082 struct snd_pcm_file *pcm_file; 3083 struct snd_pcm_substream *substream; 3084 struct snd_pcm_runtime *runtime; 3085 snd_pcm_sframes_t result; 3086 3087 pcm_file = file->private_data; 3088 substream = pcm_file->substream; 3089 if (PCM_RUNTIME_CHECK(substream)) 3090 return -ENXIO; 3091 runtime = substream->runtime; 3092 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3093 return -EBADFD; 3094 if (!frame_aligned(runtime, count)) 3095 return -EINVAL; 3096 count = bytes_to_frames(runtime, count); 3097 result = snd_pcm_lib_write(substream, buf, count); 3098 if (result > 0) 3099 result = frames_to_bytes(runtime, result); 3100 return result; 3101 } 3102 3103 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3104 { 3105 struct snd_pcm_file *pcm_file; 3106 struct snd_pcm_substream *substream; 3107 struct snd_pcm_runtime *runtime; 3108 snd_pcm_sframes_t result; 3109 unsigned long i; 3110 void __user **bufs; 3111 snd_pcm_uframes_t frames; 3112 3113 pcm_file = iocb->ki_filp->private_data; 3114 substream = pcm_file->substream; 3115 if (PCM_RUNTIME_CHECK(substream)) 3116 return -ENXIO; 3117 runtime = substream->runtime; 3118 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3119 return -EBADFD; 3120 if (!iter_is_iovec(to)) 3121 return -EINVAL; 3122 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3123 return -EINVAL; 3124 if (!frame_aligned(runtime, to->iov->iov_len)) 3125 return -EINVAL; 3126 frames = bytes_to_samples(runtime, to->iov->iov_len); 3127 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3128 if (bufs == NULL) 3129 return -ENOMEM; 3130 for (i = 0; i < to->nr_segs; ++i) 3131 bufs[i] = to->iov[i].iov_base; 3132 result = snd_pcm_lib_readv(substream, bufs, frames); 3133 if (result > 0) 3134 result = frames_to_bytes(runtime, result); 3135 kfree(bufs); 3136 return result; 3137 } 3138 3139 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3140 { 3141 struct snd_pcm_file *pcm_file; 3142 struct snd_pcm_substream *substream; 3143 struct snd_pcm_runtime *runtime; 3144 snd_pcm_sframes_t result; 3145 unsigned long i; 3146 void __user **bufs; 3147 snd_pcm_uframes_t frames; 3148 3149 pcm_file = iocb->ki_filp->private_data; 3150 substream = pcm_file->substream; 3151 if (PCM_RUNTIME_CHECK(substream)) 3152 return -ENXIO; 3153 runtime = substream->runtime; 3154 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3155 return -EBADFD; 3156 if (!iter_is_iovec(from)) 3157 return -EINVAL; 3158 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3159 !frame_aligned(runtime, from->iov->iov_len)) 3160 return -EINVAL; 3161 frames = bytes_to_samples(runtime, from->iov->iov_len); 3162 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3163 if (bufs == NULL) 3164 return -ENOMEM; 3165 for (i = 0; i < from->nr_segs; ++i) 3166 bufs[i] = from->iov[i].iov_base; 3167 result = snd_pcm_lib_writev(substream, bufs, frames); 3168 if (result > 0) 3169 result = frames_to_bytes(runtime, result); 3170 kfree(bufs); 3171 return result; 3172 } 3173 3174 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3175 { 3176 struct snd_pcm_file *pcm_file; 3177 struct snd_pcm_substream *substream; 3178 struct snd_pcm_runtime *runtime; 3179 __poll_t mask, ok; 3180 snd_pcm_uframes_t avail; 3181 3182 pcm_file = file->private_data; 3183 3184 substream = pcm_file->substream; 3185 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3186 ok = EPOLLOUT | EPOLLWRNORM; 3187 else 3188 ok = EPOLLIN | EPOLLRDNORM; 3189 if (PCM_RUNTIME_CHECK(substream)) 3190 return ok | EPOLLERR; 3191 3192 runtime = substream->runtime; 3193 poll_wait(file, &runtime->sleep, wait); 3194 3195 mask = 0; 3196 snd_pcm_stream_lock_irq(substream); 3197 avail = snd_pcm_avail(substream); 3198 switch (runtime->status->state) { 3199 case SNDRV_PCM_STATE_RUNNING: 3200 case SNDRV_PCM_STATE_PREPARED: 3201 case SNDRV_PCM_STATE_PAUSED: 3202 if (avail >= runtime->control->avail_min) 3203 mask = ok; 3204 break; 3205 case SNDRV_PCM_STATE_DRAINING: 3206 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3207 mask = ok; 3208 if (!avail) 3209 mask |= EPOLLERR; 3210 } 3211 break; 3212 default: 3213 mask = ok | EPOLLERR; 3214 break; 3215 } 3216 snd_pcm_stream_unlock_irq(substream); 3217 return mask; 3218 } 3219 3220 /* 3221 * mmap support 3222 */ 3223 3224 /* 3225 * Only on coherent architectures, we can mmap the status and the control records 3226 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3227 */ 3228 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3229 /* 3230 * mmap status record 3231 */ 3232 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3233 { 3234 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3235 struct snd_pcm_runtime *runtime; 3236 3237 if (substream == NULL) 3238 return VM_FAULT_SIGBUS; 3239 runtime = substream->runtime; 3240 vmf->page = virt_to_page(runtime->status); 3241 get_page(vmf->page); 3242 return 0; 3243 } 3244 3245 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3246 { 3247 .fault = snd_pcm_mmap_status_fault, 3248 }; 3249 3250 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3251 struct vm_area_struct *area) 3252 { 3253 long size; 3254 if (!(area->vm_flags & VM_READ)) 3255 return -EINVAL; 3256 size = area->vm_end - area->vm_start; 3257 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3258 return -EINVAL; 3259 area->vm_ops = &snd_pcm_vm_ops_status; 3260 area->vm_private_data = substream; 3261 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3262 return 0; 3263 } 3264 3265 /* 3266 * mmap control record 3267 */ 3268 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3269 { 3270 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3271 struct snd_pcm_runtime *runtime; 3272 3273 if (substream == NULL) 3274 return VM_FAULT_SIGBUS; 3275 runtime = substream->runtime; 3276 vmf->page = virt_to_page(runtime->control); 3277 get_page(vmf->page); 3278 return 0; 3279 } 3280 3281 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3282 { 3283 .fault = snd_pcm_mmap_control_fault, 3284 }; 3285 3286 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3287 struct vm_area_struct *area) 3288 { 3289 long size; 3290 if (!(area->vm_flags & VM_READ)) 3291 return -EINVAL; 3292 size = area->vm_end - area->vm_start; 3293 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3294 return -EINVAL; 3295 area->vm_ops = &snd_pcm_vm_ops_control; 3296 area->vm_private_data = substream; 3297 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3298 return 0; 3299 } 3300 3301 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3302 { 3303 if (pcm_file->no_compat_mmap) 3304 return false; 3305 /* See pcm_control_mmap_allowed() below. 3306 * Since older alsa-lib requires both status and control mmaps to be 3307 * coupled, we have to disable the status mmap for old alsa-lib, too. 3308 */ 3309 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3310 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3311 return false; 3312 return true; 3313 } 3314 3315 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3316 { 3317 if (pcm_file->no_compat_mmap) 3318 return false; 3319 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3320 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3321 * thus it effectively assures the manual update of appl_ptr. 3322 */ 3323 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3324 return false; 3325 return true; 3326 } 3327 3328 #else /* ! coherent mmap */ 3329 /* 3330 * don't support mmap for status and control records. 3331 */ 3332 #define pcm_status_mmap_allowed(pcm_file) false 3333 #define pcm_control_mmap_allowed(pcm_file) false 3334 3335 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3336 struct vm_area_struct *area) 3337 { 3338 return -ENXIO; 3339 } 3340 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3341 struct vm_area_struct *area) 3342 { 3343 return -ENXIO; 3344 } 3345 #endif /* coherent mmap */ 3346 3347 static inline struct page * 3348 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3349 { 3350 void *vaddr = substream->runtime->dma_area + ofs; 3351 return virt_to_page(vaddr); 3352 } 3353 3354 /* 3355 * fault callback for mmapping a RAM page 3356 */ 3357 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3358 { 3359 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3360 struct snd_pcm_runtime *runtime; 3361 unsigned long offset; 3362 struct page * page; 3363 size_t dma_bytes; 3364 3365 if (substream == NULL) 3366 return VM_FAULT_SIGBUS; 3367 runtime = substream->runtime; 3368 offset = vmf->pgoff << PAGE_SHIFT; 3369 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3370 if (offset > dma_bytes - PAGE_SIZE) 3371 return VM_FAULT_SIGBUS; 3372 if (substream->ops->page) 3373 page = substream->ops->page(substream, offset); 3374 else 3375 page = snd_pcm_default_page_ops(substream, offset); 3376 if (!page) 3377 return VM_FAULT_SIGBUS; 3378 get_page(page); 3379 vmf->page = page; 3380 return 0; 3381 } 3382 3383 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3384 .open = snd_pcm_mmap_data_open, 3385 .close = snd_pcm_mmap_data_close, 3386 }; 3387 3388 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3389 .open = snd_pcm_mmap_data_open, 3390 .close = snd_pcm_mmap_data_close, 3391 .fault = snd_pcm_mmap_data_fault, 3392 }; 3393 3394 /* 3395 * mmap the DMA buffer on RAM 3396 */ 3397 3398 /** 3399 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3400 * @substream: PCM substream 3401 * @area: VMA 3402 * 3403 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3404 * this function is invoked implicitly. 3405 */ 3406 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3407 struct vm_area_struct *area) 3408 { 3409 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3410 #ifdef CONFIG_GENERIC_ALLOCATOR 3411 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3412 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3413 return remap_pfn_range(area, area->vm_start, 3414 substream->dma_buffer.addr >> PAGE_SHIFT, 3415 area->vm_end - area->vm_start, area->vm_page_prot); 3416 } 3417 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3418 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3419 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3420 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3421 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3422 area, 3423 substream->runtime->dma_area, 3424 substream->runtime->dma_addr, 3425 substream->runtime->dma_bytes); 3426 #endif /* CONFIG_X86 */ 3427 /* mmap with fault handler */ 3428 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3429 return 0; 3430 } 3431 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3432 3433 /* 3434 * mmap the DMA buffer on I/O memory area 3435 */ 3436 #if SNDRV_PCM_INFO_MMAP_IOMEM 3437 /** 3438 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3439 * @substream: PCM substream 3440 * @area: VMA 3441 * 3442 * When your hardware uses the iomapped pages as the hardware buffer and 3443 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3444 * is supposed to work only on limited architectures. 3445 */ 3446 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3447 struct vm_area_struct *area) 3448 { 3449 struct snd_pcm_runtime *runtime = substream->runtime; 3450 3451 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3452 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3453 } 3454 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3455 #endif /* SNDRV_PCM_INFO_MMAP */ 3456 3457 /* 3458 * mmap DMA buffer 3459 */ 3460 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3461 struct vm_area_struct *area) 3462 { 3463 struct snd_pcm_runtime *runtime; 3464 long size; 3465 unsigned long offset; 3466 size_t dma_bytes; 3467 int err; 3468 3469 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3470 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3471 return -EINVAL; 3472 } else { 3473 if (!(area->vm_flags & VM_READ)) 3474 return -EINVAL; 3475 } 3476 runtime = substream->runtime; 3477 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3478 return -EBADFD; 3479 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3480 return -ENXIO; 3481 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3482 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3483 return -EINVAL; 3484 size = area->vm_end - area->vm_start; 3485 offset = area->vm_pgoff << PAGE_SHIFT; 3486 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3487 if ((size_t)size > dma_bytes) 3488 return -EINVAL; 3489 if (offset > dma_bytes - size) 3490 return -EINVAL; 3491 3492 area->vm_ops = &snd_pcm_vm_ops_data; 3493 area->vm_private_data = substream; 3494 if (substream->ops->mmap) 3495 err = substream->ops->mmap(substream, area); 3496 else 3497 err = snd_pcm_lib_default_mmap(substream, area); 3498 if (!err) 3499 atomic_inc(&substream->mmap_count); 3500 return err; 3501 } 3502 EXPORT_SYMBOL(snd_pcm_mmap_data); 3503 3504 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3505 { 3506 struct snd_pcm_file * pcm_file; 3507 struct snd_pcm_substream *substream; 3508 unsigned long offset; 3509 3510 pcm_file = file->private_data; 3511 substream = pcm_file->substream; 3512 if (PCM_RUNTIME_CHECK(substream)) 3513 return -ENXIO; 3514 3515 offset = area->vm_pgoff << PAGE_SHIFT; 3516 switch (offset) { 3517 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3518 if (!pcm_status_mmap_allowed(pcm_file)) 3519 return -ENXIO; 3520 return snd_pcm_mmap_status(substream, file, area); 3521 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3522 if (!pcm_control_mmap_allowed(pcm_file)) 3523 return -ENXIO; 3524 return snd_pcm_mmap_control(substream, file, area); 3525 default: 3526 return snd_pcm_mmap_data(substream, file, area); 3527 } 3528 return 0; 3529 } 3530 3531 static int snd_pcm_fasync(int fd, struct file * file, int on) 3532 { 3533 struct snd_pcm_file * pcm_file; 3534 struct snd_pcm_substream *substream; 3535 struct snd_pcm_runtime *runtime; 3536 3537 pcm_file = file->private_data; 3538 substream = pcm_file->substream; 3539 if (PCM_RUNTIME_CHECK(substream)) 3540 return -ENXIO; 3541 runtime = substream->runtime; 3542 return fasync_helper(fd, file, on, &runtime->fasync); 3543 } 3544 3545 /* 3546 * ioctl32 compat 3547 */ 3548 #ifdef CONFIG_COMPAT 3549 #include "pcm_compat.c" 3550 #else 3551 #define snd_pcm_ioctl_compat NULL 3552 #endif 3553 3554 /* 3555 * To be removed helpers to keep binary compatibility 3556 */ 3557 3558 #ifdef CONFIG_SND_SUPPORT_OLD_API 3559 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3560 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3561 3562 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3563 struct snd_pcm_hw_params_old *oparams) 3564 { 3565 unsigned int i; 3566 3567 memset(params, 0, sizeof(*params)); 3568 params->flags = oparams->flags; 3569 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3570 params->masks[i].bits[0] = oparams->masks[i]; 3571 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3572 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3573 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3574 params->info = oparams->info; 3575 params->msbits = oparams->msbits; 3576 params->rate_num = oparams->rate_num; 3577 params->rate_den = oparams->rate_den; 3578 params->fifo_size = oparams->fifo_size; 3579 } 3580 3581 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3582 struct snd_pcm_hw_params *params) 3583 { 3584 unsigned int i; 3585 3586 memset(oparams, 0, sizeof(*oparams)); 3587 oparams->flags = params->flags; 3588 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3589 oparams->masks[i] = params->masks[i].bits[0]; 3590 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3591 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3592 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3593 oparams->info = params->info; 3594 oparams->msbits = params->msbits; 3595 oparams->rate_num = params->rate_num; 3596 oparams->rate_den = params->rate_den; 3597 oparams->fifo_size = params->fifo_size; 3598 } 3599 3600 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3601 struct snd_pcm_hw_params_old __user * _oparams) 3602 { 3603 struct snd_pcm_hw_params *params; 3604 struct snd_pcm_hw_params_old *oparams = NULL; 3605 int err; 3606 3607 params = kmalloc(sizeof(*params), GFP_KERNEL); 3608 if (!params) 3609 return -ENOMEM; 3610 3611 oparams = memdup_user(_oparams, sizeof(*oparams)); 3612 if (IS_ERR(oparams)) { 3613 err = PTR_ERR(oparams); 3614 goto out; 3615 } 3616 snd_pcm_hw_convert_from_old_params(params, oparams); 3617 err = snd_pcm_hw_refine(substream, params); 3618 if (err < 0) 3619 goto out_old; 3620 3621 err = fixup_unreferenced_params(substream, params); 3622 if (err < 0) 3623 goto out_old; 3624 3625 snd_pcm_hw_convert_to_old_params(oparams, params); 3626 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3627 err = -EFAULT; 3628 out_old: 3629 kfree(oparams); 3630 out: 3631 kfree(params); 3632 return err; 3633 } 3634 3635 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3636 struct snd_pcm_hw_params_old __user * _oparams) 3637 { 3638 struct snd_pcm_hw_params *params; 3639 struct snd_pcm_hw_params_old *oparams = NULL; 3640 int err; 3641 3642 params = kmalloc(sizeof(*params), GFP_KERNEL); 3643 if (!params) 3644 return -ENOMEM; 3645 3646 oparams = memdup_user(_oparams, sizeof(*oparams)); 3647 if (IS_ERR(oparams)) { 3648 err = PTR_ERR(oparams); 3649 goto out; 3650 } 3651 3652 snd_pcm_hw_convert_from_old_params(params, oparams); 3653 err = snd_pcm_hw_params(substream, params); 3654 if (err < 0) 3655 goto out_old; 3656 3657 snd_pcm_hw_convert_to_old_params(oparams, params); 3658 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3659 err = -EFAULT; 3660 out_old: 3661 kfree(oparams); 3662 out: 3663 kfree(params); 3664 return err; 3665 } 3666 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3667 3668 #ifndef CONFIG_MMU 3669 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3670 unsigned long addr, 3671 unsigned long len, 3672 unsigned long pgoff, 3673 unsigned long flags) 3674 { 3675 struct snd_pcm_file *pcm_file = file->private_data; 3676 struct snd_pcm_substream *substream = pcm_file->substream; 3677 struct snd_pcm_runtime *runtime = substream->runtime; 3678 unsigned long offset = pgoff << PAGE_SHIFT; 3679 3680 switch (offset) { 3681 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3682 return (unsigned long)runtime->status; 3683 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3684 return (unsigned long)runtime->control; 3685 default: 3686 return (unsigned long)runtime->dma_area + offset; 3687 } 3688 } 3689 #else 3690 # define snd_pcm_get_unmapped_area NULL 3691 #endif 3692 3693 /* 3694 * Register section 3695 */ 3696 3697 const struct file_operations snd_pcm_f_ops[2] = { 3698 { 3699 .owner = THIS_MODULE, 3700 .write = snd_pcm_write, 3701 .write_iter = snd_pcm_writev, 3702 .open = snd_pcm_playback_open, 3703 .release = snd_pcm_release, 3704 .llseek = no_llseek, 3705 .poll = snd_pcm_poll, 3706 .unlocked_ioctl = snd_pcm_ioctl, 3707 .compat_ioctl = snd_pcm_ioctl_compat, 3708 .mmap = snd_pcm_mmap, 3709 .fasync = snd_pcm_fasync, 3710 .get_unmapped_area = snd_pcm_get_unmapped_area, 3711 }, 3712 { 3713 .owner = THIS_MODULE, 3714 .read = snd_pcm_read, 3715 .read_iter = snd_pcm_readv, 3716 .open = snd_pcm_capture_open, 3717 .release = snd_pcm_release, 3718 .llseek = no_llseek, 3719 .poll = snd_pcm_poll, 3720 .unlocked_ioctl = snd_pcm_ioctl, 3721 .compat_ioctl = snd_pcm_ioctl_compat, 3722 .mmap = snd_pcm_mmap, 3723 .fasync = snd_pcm_fasync, 3724 .get_unmapped_area = snd_pcm_get_unmapped_area, 3725 } 3726 }; 3727