1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/file.h> 25 #include <linux/slab.h> 26 #include <linux/sched/signal.h> 27 #include <linux/time.h> 28 #include <linux/pm_qos.h> 29 #include <linux/io.h> 30 #include <linux/dma-mapping.h> 31 #include <sound/core.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/pcm.h> 35 #include <sound/pcm_params.h> 36 #include <sound/timer.h> 37 #include <sound/minors.h> 38 #include <linux/uio.h> 39 #include <linux/delay.h> 40 41 #include "pcm_local.h" 42 43 #ifdef CONFIG_SND_DEBUG 44 #define CREATE_TRACE_POINTS 45 #include "pcm_param_trace.h" 46 #else 47 #define trace_hw_mask_param_enabled() 0 48 #define trace_hw_interval_param_enabled() 0 49 #define trace_hw_mask_param(substream, type, index, prev, curr) 50 #define trace_hw_interval_param(substream, type, index, prev, curr) 51 #endif 52 53 /* 54 * Compatibility 55 */ 56 57 struct snd_pcm_hw_params_old { 58 unsigned int flags; 59 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 60 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 61 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 62 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 63 unsigned int rmask; 64 unsigned int cmask; 65 unsigned int info; 66 unsigned int msbits; 67 unsigned int rate_num; 68 unsigned int rate_den; 69 snd_pcm_uframes_t fifo_size; 70 unsigned char reserved[64]; 71 }; 72 73 #ifdef CONFIG_SND_SUPPORT_OLD_API 74 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 75 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 76 77 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 78 struct snd_pcm_hw_params_old __user * _oparams); 79 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 80 struct snd_pcm_hw_params_old __user * _oparams); 81 #endif 82 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 83 84 /* 85 * 86 */ 87 88 static DECLARE_RWSEM(snd_pcm_link_rwsem); 89 90 void snd_pcm_group_init(struct snd_pcm_group *group) 91 { 92 spin_lock_init(&group->lock); 93 mutex_init(&group->mutex); 94 INIT_LIST_HEAD(&group->substreams); 95 refcount_set(&group->refs, 0); 96 } 97 98 /* define group lock helpers */ 99 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \ 100 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \ 101 { \ 102 if (nonatomic) \ 103 mutex_ ## mutex_action(&group->mutex); \ 104 else \ 105 spin_ ## action(&group->lock); \ 106 } 107 108 DEFINE_PCM_GROUP_LOCK(lock, lock); 109 DEFINE_PCM_GROUP_LOCK(unlock, unlock); 110 DEFINE_PCM_GROUP_LOCK(lock_irq, lock); 111 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock); 112 113 /** 114 * snd_pcm_stream_lock - Lock the PCM stream 115 * @substream: PCM substream 116 * 117 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 118 * flag of the given substream. This also takes the global link rw lock 119 * (or rw sem), too, for avoiding the race with linked streams. 120 */ 121 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 122 { 123 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic); 124 } 125 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 126 127 /** 128 * snd_pcm_stream_lock - Unlock the PCM stream 129 * @substream: PCM substream 130 * 131 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 132 */ 133 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 134 { 135 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic); 136 } 137 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 138 139 /** 140 * snd_pcm_stream_lock_irq - Lock the PCM stream 141 * @substream: PCM substream 142 * 143 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 144 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 145 * as snd_pcm_stream_lock(). 146 */ 147 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 148 { 149 snd_pcm_group_lock_irq(&substream->self_group, 150 substream->pcm->nonatomic); 151 } 152 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 153 154 /** 155 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 156 * @substream: PCM substream 157 * 158 * This is a counter-part of snd_pcm_stream_lock_irq(). 159 */ 160 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 161 { 162 snd_pcm_group_unlock_irq(&substream->self_group, 163 substream->pcm->nonatomic); 164 } 165 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 166 167 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 168 { 169 unsigned long flags = 0; 170 if (substream->pcm->nonatomic) 171 mutex_lock(&substream->self_group.mutex); 172 else 173 spin_lock_irqsave(&substream->self_group.lock, flags); 174 return flags; 175 } 176 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 177 178 /** 179 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 180 * @substream: PCM substream 181 * @flags: irq flags 182 * 183 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 184 */ 185 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 186 unsigned long flags) 187 { 188 if (substream->pcm->nonatomic) 189 mutex_unlock(&substream->self_group.mutex); 190 else 191 spin_unlock_irqrestore(&substream->self_group.lock, flags); 192 } 193 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 194 195 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 196 { 197 struct snd_pcm *pcm = substream->pcm; 198 struct snd_pcm_str *pstr = substream->pstr; 199 200 memset(info, 0, sizeof(*info)); 201 info->card = pcm->card->number; 202 info->device = pcm->device; 203 info->stream = substream->stream; 204 info->subdevice = substream->number; 205 strlcpy(info->id, pcm->id, sizeof(info->id)); 206 strlcpy(info->name, pcm->name, sizeof(info->name)); 207 info->dev_class = pcm->dev_class; 208 info->dev_subclass = pcm->dev_subclass; 209 info->subdevices_count = pstr->substream_count; 210 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 211 strlcpy(info->subname, substream->name, sizeof(info->subname)); 212 213 return 0; 214 } 215 216 int snd_pcm_info_user(struct snd_pcm_substream *substream, 217 struct snd_pcm_info __user * _info) 218 { 219 struct snd_pcm_info *info; 220 int err; 221 222 info = kmalloc(sizeof(*info), GFP_KERNEL); 223 if (! info) 224 return -ENOMEM; 225 err = snd_pcm_info(substream, info); 226 if (err >= 0) { 227 if (copy_to_user(_info, info, sizeof(*info))) 228 err = -EFAULT; 229 } 230 kfree(info); 231 return err; 232 } 233 234 static bool hw_support_mmap(struct snd_pcm_substream *substream) 235 { 236 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 237 return false; 238 /* architecture supports dma_mmap_coherent()? */ 239 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA) 240 if (!substream->ops->mmap && 241 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 242 return false; 243 #endif 244 return true; 245 } 246 247 static int constrain_mask_params(struct snd_pcm_substream *substream, 248 struct snd_pcm_hw_params *params) 249 { 250 struct snd_pcm_hw_constraints *constrs = 251 &substream->runtime->hw_constraints; 252 struct snd_mask *m; 253 unsigned int k; 254 struct snd_mask old_mask; 255 int changed; 256 257 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 258 m = hw_param_mask(params, k); 259 if (snd_mask_empty(m)) 260 return -EINVAL; 261 262 /* This parameter is not requested to change by a caller. */ 263 if (!(params->rmask & (1 << k))) 264 continue; 265 266 if (trace_hw_mask_param_enabled()) 267 old_mask = *m; 268 269 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 270 if (changed < 0) 271 return changed; 272 if (changed == 0) 273 continue; 274 275 /* Set corresponding flag so that the caller gets it. */ 276 trace_hw_mask_param(substream, k, 0, &old_mask, m); 277 params->cmask |= 1 << k; 278 } 279 280 return 0; 281 } 282 283 static int constrain_interval_params(struct snd_pcm_substream *substream, 284 struct snd_pcm_hw_params *params) 285 { 286 struct snd_pcm_hw_constraints *constrs = 287 &substream->runtime->hw_constraints; 288 struct snd_interval *i; 289 unsigned int k; 290 struct snd_interval old_interval; 291 int changed; 292 293 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 294 i = hw_param_interval(params, k); 295 if (snd_interval_empty(i)) 296 return -EINVAL; 297 298 /* This parameter is not requested to change by a caller. */ 299 if (!(params->rmask & (1 << k))) 300 continue; 301 302 if (trace_hw_interval_param_enabled()) 303 old_interval = *i; 304 305 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 306 if (changed < 0) 307 return changed; 308 if (changed == 0) 309 continue; 310 311 /* Set corresponding flag so that the caller gets it. */ 312 trace_hw_interval_param(substream, k, 0, &old_interval, i); 313 params->cmask |= 1 << k; 314 } 315 316 return 0; 317 } 318 319 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 320 struct snd_pcm_hw_params *params) 321 { 322 struct snd_pcm_hw_constraints *constrs = 323 &substream->runtime->hw_constraints; 324 unsigned int k; 325 unsigned int *rstamps; 326 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 327 unsigned int stamp; 328 struct snd_pcm_hw_rule *r; 329 unsigned int d; 330 struct snd_mask old_mask; 331 struct snd_interval old_interval; 332 bool again; 333 int changed, err = 0; 334 335 /* 336 * Each application of rule has own sequence number. 337 * 338 * Each member of 'rstamps' array represents the sequence number of 339 * recent application of corresponding rule. 340 */ 341 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 342 if (!rstamps) 343 return -ENOMEM; 344 345 /* 346 * Each member of 'vstamps' array represents the sequence number of 347 * recent application of rule in which corresponding parameters were 348 * changed. 349 * 350 * In initial state, elements corresponding to parameters requested by 351 * a caller is 1. For unrequested parameters, corresponding members 352 * have 0 so that the parameters are never changed anymore. 353 */ 354 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 355 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 356 357 /* Due to the above design, actual sequence number starts at 2. */ 358 stamp = 2; 359 retry: 360 /* Apply all rules in order. */ 361 again = false; 362 for (k = 0; k < constrs->rules_num; k++) { 363 r = &constrs->rules[k]; 364 365 /* 366 * Check condition bits of this rule. When the rule has 367 * some condition bits, parameter without the bits is 368 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 369 * is an example of the condition bits. 370 */ 371 if (r->cond && !(r->cond & params->flags)) 372 continue; 373 374 /* 375 * The 'deps' array includes maximum three dependencies 376 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 377 * member of this array is a sentinel and should be 378 * negative value. 379 * 380 * This rule should be processed in this time when dependent 381 * parameters were changed at former applications of the other 382 * rules. 383 */ 384 for (d = 0; r->deps[d] >= 0; d++) { 385 if (vstamps[r->deps[d]] > rstamps[k]) 386 break; 387 } 388 if (r->deps[d] < 0) 389 continue; 390 391 if (trace_hw_mask_param_enabled()) { 392 if (hw_is_mask(r->var)) 393 old_mask = *hw_param_mask(params, r->var); 394 } 395 if (trace_hw_interval_param_enabled()) { 396 if (hw_is_interval(r->var)) 397 old_interval = *hw_param_interval(params, r->var); 398 } 399 400 changed = r->func(params, r); 401 if (changed < 0) { 402 err = changed; 403 goto out; 404 } 405 406 /* 407 * When the parameter is changed, notify it to the caller 408 * by corresponding returned bit, then preparing for next 409 * iteration. 410 */ 411 if (changed && r->var >= 0) { 412 if (hw_is_mask(r->var)) { 413 trace_hw_mask_param(substream, r->var, 414 k + 1, &old_mask, 415 hw_param_mask(params, r->var)); 416 } 417 if (hw_is_interval(r->var)) { 418 trace_hw_interval_param(substream, r->var, 419 k + 1, &old_interval, 420 hw_param_interval(params, r->var)); 421 } 422 423 params->cmask |= (1 << r->var); 424 vstamps[r->var] = stamp; 425 again = true; 426 } 427 428 rstamps[k] = stamp++; 429 } 430 431 /* Iterate to evaluate all rules till no parameters are changed. */ 432 if (again) 433 goto retry; 434 435 out: 436 kfree(rstamps); 437 return err; 438 } 439 440 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 441 struct snd_pcm_hw_params *params) 442 { 443 const struct snd_interval *i; 444 const struct snd_mask *m; 445 int err; 446 447 if (!params->msbits) { 448 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 449 if (snd_interval_single(i)) 450 params->msbits = snd_interval_value(i); 451 } 452 453 if (!params->rate_den) { 454 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 455 if (snd_interval_single(i)) { 456 params->rate_num = snd_interval_value(i); 457 params->rate_den = 1; 458 } 459 } 460 461 if (!params->fifo_size) { 462 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 463 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 464 if (snd_mask_single(m) && snd_interval_single(i)) { 465 err = substream->ops->ioctl(substream, 466 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 467 if (err < 0) 468 return err; 469 } 470 } 471 472 if (!params->info) { 473 params->info = substream->runtime->hw.info; 474 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 475 SNDRV_PCM_INFO_DRAIN_TRIGGER); 476 if (!hw_support_mmap(substream)) 477 params->info &= ~(SNDRV_PCM_INFO_MMAP | 478 SNDRV_PCM_INFO_MMAP_VALID); 479 } 480 481 return 0; 482 } 483 484 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 485 struct snd_pcm_hw_params *params) 486 { 487 int err; 488 489 params->info = 0; 490 params->fifo_size = 0; 491 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 492 params->msbits = 0; 493 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 494 params->rate_num = 0; 495 params->rate_den = 0; 496 } 497 498 err = constrain_mask_params(substream, params); 499 if (err < 0) 500 return err; 501 502 err = constrain_interval_params(substream, params); 503 if (err < 0) 504 return err; 505 506 err = constrain_params_by_rules(substream, params); 507 if (err < 0) 508 return err; 509 510 params->rmask = 0; 511 512 return 0; 513 } 514 EXPORT_SYMBOL(snd_pcm_hw_refine); 515 516 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 517 struct snd_pcm_hw_params __user * _params) 518 { 519 struct snd_pcm_hw_params *params; 520 int err; 521 522 params = memdup_user(_params, sizeof(*params)); 523 if (IS_ERR(params)) 524 return PTR_ERR(params); 525 526 err = snd_pcm_hw_refine(substream, params); 527 if (err < 0) 528 goto end; 529 530 err = fixup_unreferenced_params(substream, params); 531 if (err < 0) 532 goto end; 533 534 if (copy_to_user(_params, params, sizeof(*params))) 535 err = -EFAULT; 536 end: 537 kfree(params); 538 return err; 539 } 540 541 static int period_to_usecs(struct snd_pcm_runtime *runtime) 542 { 543 int usecs; 544 545 if (! runtime->rate) 546 return -1; /* invalid */ 547 548 /* take 75% of period time as the deadline */ 549 usecs = (750000 / runtime->rate) * runtime->period_size; 550 usecs += ((750000 % runtime->rate) * runtime->period_size) / 551 runtime->rate; 552 553 return usecs; 554 } 555 556 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 557 { 558 snd_pcm_stream_lock_irq(substream); 559 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 560 substream->runtime->status->state = state; 561 snd_pcm_stream_unlock_irq(substream); 562 } 563 564 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 565 int event) 566 { 567 #ifdef CONFIG_SND_PCM_TIMER 568 if (substream->timer) 569 snd_timer_notify(substream->timer, event, 570 &substream->runtime->trigger_tstamp); 571 #endif 572 } 573 574 /** 575 * snd_pcm_hw_param_choose - choose a configuration defined by @params 576 * @pcm: PCM instance 577 * @params: the hw_params instance 578 * 579 * Choose one configuration from configuration space defined by @params. 580 * The configuration chosen is that obtained fixing in this order: 581 * first access, first format, first subformat, min channels, 582 * min rate, min period time, max buffer size, min tick time 583 * 584 * Return: Zero if successful, or a negative error code on failure. 585 */ 586 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 587 struct snd_pcm_hw_params *params) 588 { 589 static const int vars[] = { 590 SNDRV_PCM_HW_PARAM_ACCESS, 591 SNDRV_PCM_HW_PARAM_FORMAT, 592 SNDRV_PCM_HW_PARAM_SUBFORMAT, 593 SNDRV_PCM_HW_PARAM_CHANNELS, 594 SNDRV_PCM_HW_PARAM_RATE, 595 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 596 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 597 SNDRV_PCM_HW_PARAM_TICK_TIME, 598 -1 599 }; 600 const int *v; 601 struct snd_mask old_mask; 602 struct snd_interval old_interval; 603 int changed; 604 605 for (v = vars; *v != -1; v++) { 606 /* Keep old parameter to trace. */ 607 if (trace_hw_mask_param_enabled()) { 608 if (hw_is_mask(*v)) 609 old_mask = *hw_param_mask(params, *v); 610 } 611 if (trace_hw_interval_param_enabled()) { 612 if (hw_is_interval(*v)) 613 old_interval = *hw_param_interval(params, *v); 614 } 615 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 616 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 617 else 618 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 619 if (changed < 0) 620 return changed; 621 if (changed == 0) 622 continue; 623 624 /* Trace the changed parameter. */ 625 if (hw_is_mask(*v)) { 626 trace_hw_mask_param(pcm, *v, 0, &old_mask, 627 hw_param_mask(params, *v)); 628 } 629 if (hw_is_interval(*v)) { 630 trace_hw_interval_param(pcm, *v, 0, &old_interval, 631 hw_param_interval(params, *v)); 632 } 633 } 634 635 return 0; 636 } 637 638 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 639 struct snd_pcm_hw_params *params) 640 { 641 struct snd_pcm_runtime *runtime; 642 int err, usecs; 643 unsigned int bits; 644 snd_pcm_uframes_t frames; 645 646 if (PCM_RUNTIME_CHECK(substream)) 647 return -ENXIO; 648 runtime = substream->runtime; 649 snd_pcm_stream_lock_irq(substream); 650 switch (runtime->status->state) { 651 case SNDRV_PCM_STATE_OPEN: 652 case SNDRV_PCM_STATE_SETUP: 653 case SNDRV_PCM_STATE_PREPARED: 654 break; 655 default: 656 snd_pcm_stream_unlock_irq(substream); 657 return -EBADFD; 658 } 659 snd_pcm_stream_unlock_irq(substream); 660 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 661 if (!substream->oss.oss) 662 #endif 663 if (atomic_read(&substream->mmap_count)) 664 return -EBADFD; 665 666 params->rmask = ~0U; 667 err = snd_pcm_hw_refine(substream, params); 668 if (err < 0) 669 goto _error; 670 671 err = snd_pcm_hw_params_choose(substream, params); 672 if (err < 0) 673 goto _error; 674 675 err = fixup_unreferenced_params(substream, params); 676 if (err < 0) 677 goto _error; 678 679 if (substream->ops->hw_params != NULL) { 680 err = substream->ops->hw_params(substream, params); 681 if (err < 0) 682 goto _error; 683 } 684 685 runtime->access = params_access(params); 686 runtime->format = params_format(params); 687 runtime->subformat = params_subformat(params); 688 runtime->channels = params_channels(params); 689 runtime->rate = params_rate(params); 690 runtime->period_size = params_period_size(params); 691 runtime->periods = params_periods(params); 692 runtime->buffer_size = params_buffer_size(params); 693 runtime->info = params->info; 694 runtime->rate_num = params->rate_num; 695 runtime->rate_den = params->rate_den; 696 runtime->no_period_wakeup = 697 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 698 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 699 700 bits = snd_pcm_format_physical_width(runtime->format); 701 runtime->sample_bits = bits; 702 bits *= runtime->channels; 703 runtime->frame_bits = bits; 704 frames = 1; 705 while (bits % 8 != 0) { 706 bits *= 2; 707 frames *= 2; 708 } 709 runtime->byte_align = bits / 8; 710 runtime->min_align = frames; 711 712 /* Default sw params */ 713 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 714 runtime->period_step = 1; 715 runtime->control->avail_min = runtime->period_size; 716 runtime->start_threshold = 1; 717 runtime->stop_threshold = runtime->buffer_size; 718 runtime->silence_threshold = 0; 719 runtime->silence_size = 0; 720 runtime->boundary = runtime->buffer_size; 721 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 722 runtime->boundary *= 2; 723 724 snd_pcm_timer_resolution_change(substream); 725 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 726 727 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 728 pm_qos_remove_request(&substream->latency_pm_qos_req); 729 if ((usecs = period_to_usecs(runtime)) >= 0) 730 pm_qos_add_request(&substream->latency_pm_qos_req, 731 PM_QOS_CPU_DMA_LATENCY, usecs); 732 return 0; 733 _error: 734 /* hardware might be unusable from this time, 735 so we force application to retry to set 736 the correct hardware parameter settings */ 737 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 738 if (substream->ops->hw_free != NULL) 739 substream->ops->hw_free(substream); 740 return err; 741 } 742 743 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 744 struct snd_pcm_hw_params __user * _params) 745 { 746 struct snd_pcm_hw_params *params; 747 int err; 748 749 params = memdup_user(_params, sizeof(*params)); 750 if (IS_ERR(params)) 751 return PTR_ERR(params); 752 753 err = snd_pcm_hw_params(substream, params); 754 if (err < 0) 755 goto end; 756 757 if (copy_to_user(_params, params, sizeof(*params))) 758 err = -EFAULT; 759 end: 760 kfree(params); 761 return err; 762 } 763 764 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 765 { 766 struct snd_pcm_runtime *runtime; 767 int result = 0; 768 769 if (PCM_RUNTIME_CHECK(substream)) 770 return -ENXIO; 771 runtime = substream->runtime; 772 snd_pcm_stream_lock_irq(substream); 773 switch (runtime->status->state) { 774 case SNDRV_PCM_STATE_SETUP: 775 case SNDRV_PCM_STATE_PREPARED: 776 break; 777 default: 778 snd_pcm_stream_unlock_irq(substream); 779 return -EBADFD; 780 } 781 snd_pcm_stream_unlock_irq(substream); 782 if (atomic_read(&substream->mmap_count)) 783 return -EBADFD; 784 if (substream->ops->hw_free) 785 result = substream->ops->hw_free(substream); 786 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 787 pm_qos_remove_request(&substream->latency_pm_qos_req); 788 return result; 789 } 790 791 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 792 struct snd_pcm_sw_params *params) 793 { 794 struct snd_pcm_runtime *runtime; 795 int err; 796 797 if (PCM_RUNTIME_CHECK(substream)) 798 return -ENXIO; 799 runtime = substream->runtime; 800 snd_pcm_stream_lock_irq(substream); 801 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 802 snd_pcm_stream_unlock_irq(substream); 803 return -EBADFD; 804 } 805 snd_pcm_stream_unlock_irq(substream); 806 807 if (params->tstamp_mode < 0 || 808 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 809 return -EINVAL; 810 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 811 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 812 return -EINVAL; 813 if (params->avail_min == 0) 814 return -EINVAL; 815 if (params->silence_size >= runtime->boundary) { 816 if (params->silence_threshold != 0) 817 return -EINVAL; 818 } else { 819 if (params->silence_size > params->silence_threshold) 820 return -EINVAL; 821 if (params->silence_threshold > runtime->buffer_size) 822 return -EINVAL; 823 } 824 err = 0; 825 snd_pcm_stream_lock_irq(substream); 826 runtime->tstamp_mode = params->tstamp_mode; 827 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 828 runtime->tstamp_type = params->tstamp_type; 829 runtime->period_step = params->period_step; 830 runtime->control->avail_min = params->avail_min; 831 runtime->start_threshold = params->start_threshold; 832 runtime->stop_threshold = params->stop_threshold; 833 runtime->silence_threshold = params->silence_threshold; 834 runtime->silence_size = params->silence_size; 835 params->boundary = runtime->boundary; 836 if (snd_pcm_running(substream)) { 837 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 838 runtime->silence_size > 0) 839 snd_pcm_playback_silence(substream, ULONG_MAX); 840 err = snd_pcm_update_state(substream, runtime); 841 } 842 snd_pcm_stream_unlock_irq(substream); 843 return err; 844 } 845 846 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 847 struct snd_pcm_sw_params __user * _params) 848 { 849 struct snd_pcm_sw_params params; 850 int err; 851 if (copy_from_user(¶ms, _params, sizeof(params))) 852 return -EFAULT; 853 err = snd_pcm_sw_params(substream, ¶ms); 854 if (copy_to_user(_params, ¶ms, sizeof(params))) 855 return -EFAULT; 856 return err; 857 } 858 859 static inline snd_pcm_uframes_t 860 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 861 { 862 snd_pcm_uframes_t delay; 863 864 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 865 delay = snd_pcm_playback_hw_avail(substream->runtime); 866 else 867 delay = snd_pcm_capture_avail(substream->runtime); 868 return delay + substream->runtime->delay; 869 } 870 871 int snd_pcm_status(struct snd_pcm_substream *substream, 872 struct snd_pcm_status *status) 873 { 874 struct snd_pcm_runtime *runtime = substream->runtime; 875 876 snd_pcm_stream_lock_irq(substream); 877 878 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 879 &runtime->audio_tstamp_config); 880 881 /* backwards compatible behavior */ 882 if (runtime->audio_tstamp_config.type_requested == 883 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 884 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 885 runtime->audio_tstamp_config.type_requested = 886 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 887 else 888 runtime->audio_tstamp_config.type_requested = 889 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 890 runtime->audio_tstamp_report.valid = 0; 891 } else 892 runtime->audio_tstamp_report.valid = 1; 893 894 status->state = runtime->status->state; 895 status->suspended_state = runtime->status->suspended_state; 896 if (status->state == SNDRV_PCM_STATE_OPEN) 897 goto _end; 898 status->trigger_tstamp = runtime->trigger_tstamp; 899 if (snd_pcm_running(substream)) { 900 snd_pcm_update_hw_ptr(substream); 901 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 902 status->tstamp = runtime->status->tstamp; 903 status->driver_tstamp = runtime->driver_tstamp; 904 status->audio_tstamp = 905 runtime->status->audio_tstamp; 906 if (runtime->audio_tstamp_report.valid == 1) 907 /* backwards compatibility, no report provided in COMPAT mode */ 908 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 909 &status->audio_tstamp_accuracy, 910 &runtime->audio_tstamp_report); 911 912 goto _tstamp_end; 913 } 914 } else { 915 /* get tstamp only in fallback mode and only if enabled */ 916 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 917 snd_pcm_gettime(runtime, &status->tstamp); 918 } 919 _tstamp_end: 920 status->appl_ptr = runtime->control->appl_ptr; 921 status->hw_ptr = runtime->status->hw_ptr; 922 status->avail = snd_pcm_avail(substream); 923 status->delay = snd_pcm_running(substream) ? 924 snd_pcm_calc_delay(substream) : 0; 925 status->avail_max = runtime->avail_max; 926 status->overrange = runtime->overrange; 927 runtime->avail_max = 0; 928 runtime->overrange = 0; 929 _end: 930 snd_pcm_stream_unlock_irq(substream); 931 return 0; 932 } 933 934 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 935 struct snd_pcm_status __user * _status, 936 bool ext) 937 { 938 struct snd_pcm_status status; 939 int res; 940 941 memset(&status, 0, sizeof(status)); 942 /* 943 * with extension, parameters are read/write, 944 * get audio_tstamp_data from user, 945 * ignore rest of status structure 946 */ 947 if (ext && get_user(status.audio_tstamp_data, 948 (u32 __user *)(&_status->audio_tstamp_data))) 949 return -EFAULT; 950 res = snd_pcm_status(substream, &status); 951 if (res < 0) 952 return res; 953 if (copy_to_user(_status, &status, sizeof(status))) 954 return -EFAULT; 955 return 0; 956 } 957 958 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 959 struct snd_pcm_channel_info * info) 960 { 961 struct snd_pcm_runtime *runtime; 962 unsigned int channel; 963 964 channel = info->channel; 965 runtime = substream->runtime; 966 snd_pcm_stream_lock_irq(substream); 967 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 968 snd_pcm_stream_unlock_irq(substream); 969 return -EBADFD; 970 } 971 snd_pcm_stream_unlock_irq(substream); 972 if (channel >= runtime->channels) 973 return -EINVAL; 974 memset(info, 0, sizeof(*info)); 975 info->channel = channel; 976 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 977 } 978 979 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 980 struct snd_pcm_channel_info __user * _info) 981 { 982 struct snd_pcm_channel_info info; 983 int res; 984 985 if (copy_from_user(&info, _info, sizeof(info))) 986 return -EFAULT; 987 res = snd_pcm_channel_info(substream, &info); 988 if (res < 0) 989 return res; 990 if (copy_to_user(_info, &info, sizeof(info))) 991 return -EFAULT; 992 return 0; 993 } 994 995 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 996 { 997 struct snd_pcm_runtime *runtime = substream->runtime; 998 if (runtime->trigger_master == NULL) 999 return; 1000 if (runtime->trigger_master == substream) { 1001 if (!runtime->trigger_tstamp_latched) 1002 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1003 } else { 1004 snd_pcm_trigger_tstamp(runtime->trigger_master); 1005 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1006 } 1007 runtime->trigger_master = NULL; 1008 } 1009 1010 struct action_ops { 1011 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1012 int (*do_action)(struct snd_pcm_substream *substream, int state); 1013 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1014 void (*post_action)(struct snd_pcm_substream *substream, int state); 1015 }; 1016 1017 /* 1018 * this functions is core for handling of linked stream 1019 * Note: the stream state might be changed also on failure 1020 * Note2: call with calling stream lock + link lock 1021 */ 1022 static int snd_pcm_action_group(const struct action_ops *ops, 1023 struct snd_pcm_substream *substream, 1024 int state, int do_lock) 1025 { 1026 struct snd_pcm_substream *s = NULL; 1027 struct snd_pcm_substream *s1; 1028 int res = 0, depth = 1; 1029 1030 snd_pcm_group_for_each_entry(s, substream) { 1031 if (do_lock && s != substream) { 1032 if (s->pcm->nonatomic) 1033 mutex_lock_nested(&s->self_group.mutex, depth); 1034 else 1035 spin_lock_nested(&s->self_group.lock, depth); 1036 depth++; 1037 } 1038 res = ops->pre_action(s, state); 1039 if (res < 0) 1040 goto _unlock; 1041 } 1042 snd_pcm_group_for_each_entry(s, substream) { 1043 res = ops->do_action(s, state); 1044 if (res < 0) { 1045 if (ops->undo_action) { 1046 snd_pcm_group_for_each_entry(s1, substream) { 1047 if (s1 == s) /* failed stream */ 1048 break; 1049 ops->undo_action(s1, state); 1050 } 1051 } 1052 s = NULL; /* unlock all */ 1053 goto _unlock; 1054 } 1055 } 1056 snd_pcm_group_for_each_entry(s, substream) { 1057 ops->post_action(s, state); 1058 } 1059 _unlock: 1060 if (do_lock) { 1061 /* unlock streams */ 1062 snd_pcm_group_for_each_entry(s1, substream) { 1063 if (s1 != substream) { 1064 if (s1->pcm->nonatomic) 1065 mutex_unlock(&s1->self_group.mutex); 1066 else 1067 spin_unlock(&s1->self_group.lock); 1068 } 1069 if (s1 == s) /* end */ 1070 break; 1071 } 1072 } 1073 return res; 1074 } 1075 1076 /* 1077 * Note: call with stream lock 1078 */ 1079 static int snd_pcm_action_single(const struct action_ops *ops, 1080 struct snd_pcm_substream *substream, 1081 int state) 1082 { 1083 int res; 1084 1085 res = ops->pre_action(substream, state); 1086 if (res < 0) 1087 return res; 1088 res = ops->do_action(substream, state); 1089 if (res == 0) 1090 ops->post_action(substream, state); 1091 else if (ops->undo_action) 1092 ops->undo_action(substream, state); 1093 return res; 1094 } 1095 1096 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1097 struct snd_pcm_group *new_group) 1098 { 1099 substream->group = new_group; 1100 list_move(&substream->link_list, &new_group->substreams); 1101 } 1102 1103 /* 1104 * Unref and unlock the group, but keep the stream lock; 1105 * when the group becomes empty and no longer referred, destroy itself 1106 */ 1107 static void snd_pcm_group_unref(struct snd_pcm_group *group, 1108 struct snd_pcm_substream *substream) 1109 { 1110 bool do_free; 1111 1112 if (!group) 1113 return; 1114 do_free = refcount_dec_and_test(&group->refs) && 1115 list_empty(&group->substreams); 1116 snd_pcm_group_unlock(group, substream->pcm->nonatomic); 1117 if (do_free) 1118 kfree(group); 1119 } 1120 1121 /* 1122 * Lock the group inside a stream lock and reference it; 1123 * return the locked group object, or NULL if not linked 1124 */ 1125 static struct snd_pcm_group * 1126 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) 1127 { 1128 bool nonatomic = substream->pcm->nonatomic; 1129 struct snd_pcm_group *group; 1130 bool trylock; 1131 1132 for (;;) { 1133 if (!snd_pcm_stream_linked(substream)) 1134 return NULL; 1135 group = substream->group; 1136 /* block freeing the group object */ 1137 refcount_inc(&group->refs); 1138 1139 trylock = nonatomic ? mutex_trylock(&group->mutex) : 1140 spin_trylock(&group->lock); 1141 if (trylock) 1142 break; /* OK */ 1143 1144 /* re-lock for avoiding ABBA deadlock */ 1145 snd_pcm_stream_unlock(substream); 1146 snd_pcm_group_lock(group, nonatomic); 1147 snd_pcm_stream_lock(substream); 1148 1149 /* check the group again; the above opens a small race window */ 1150 if (substream->group == group) 1151 break; /* OK */ 1152 /* group changed, try again */ 1153 snd_pcm_group_unref(group, substream); 1154 } 1155 return group; 1156 } 1157 1158 /* 1159 * Note: call with stream lock 1160 */ 1161 static int snd_pcm_action(const struct action_ops *ops, 1162 struct snd_pcm_substream *substream, 1163 int state) 1164 { 1165 struct snd_pcm_group *group; 1166 int res; 1167 1168 group = snd_pcm_stream_group_ref(substream); 1169 if (group) 1170 res = snd_pcm_action_group(ops, substream, state, 1); 1171 else 1172 res = snd_pcm_action_single(ops, substream, state); 1173 snd_pcm_group_unref(group, substream); 1174 return res; 1175 } 1176 1177 /* 1178 * Note: don't use any locks before 1179 */ 1180 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1181 struct snd_pcm_substream *substream, 1182 int state) 1183 { 1184 int res; 1185 1186 snd_pcm_stream_lock_irq(substream); 1187 res = snd_pcm_action(ops, substream, state); 1188 snd_pcm_stream_unlock_irq(substream); 1189 return res; 1190 } 1191 1192 /* 1193 */ 1194 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1195 struct snd_pcm_substream *substream, 1196 int state) 1197 { 1198 int res; 1199 1200 /* Guarantee the group members won't change during non-atomic action */ 1201 down_read(&snd_pcm_link_rwsem); 1202 if (snd_pcm_stream_linked(substream)) 1203 res = snd_pcm_action_group(ops, substream, state, 0); 1204 else 1205 res = snd_pcm_action_single(ops, substream, state); 1206 up_read(&snd_pcm_link_rwsem); 1207 return res; 1208 } 1209 1210 /* 1211 * start callbacks 1212 */ 1213 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1214 { 1215 struct snd_pcm_runtime *runtime = substream->runtime; 1216 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1217 return -EBADFD; 1218 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1219 !snd_pcm_playback_data(substream)) 1220 return -EPIPE; 1221 runtime->trigger_tstamp_latched = false; 1222 runtime->trigger_master = substream; 1223 return 0; 1224 } 1225 1226 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1227 { 1228 if (substream->runtime->trigger_master != substream) 1229 return 0; 1230 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1231 } 1232 1233 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1234 { 1235 if (substream->runtime->trigger_master == substream) 1236 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1237 } 1238 1239 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1240 { 1241 struct snd_pcm_runtime *runtime = substream->runtime; 1242 snd_pcm_trigger_tstamp(substream); 1243 runtime->hw_ptr_jiffies = jiffies; 1244 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1245 runtime->rate; 1246 runtime->status->state = state; 1247 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1248 runtime->silence_size > 0) 1249 snd_pcm_playback_silence(substream, ULONG_MAX); 1250 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1251 } 1252 1253 static const struct action_ops snd_pcm_action_start = { 1254 .pre_action = snd_pcm_pre_start, 1255 .do_action = snd_pcm_do_start, 1256 .undo_action = snd_pcm_undo_start, 1257 .post_action = snd_pcm_post_start 1258 }; 1259 1260 /** 1261 * snd_pcm_start - start all linked streams 1262 * @substream: the PCM substream instance 1263 * 1264 * Return: Zero if successful, or a negative error code. 1265 * The stream lock must be acquired before calling this function. 1266 */ 1267 int snd_pcm_start(struct snd_pcm_substream *substream) 1268 { 1269 return snd_pcm_action(&snd_pcm_action_start, substream, 1270 SNDRV_PCM_STATE_RUNNING); 1271 } 1272 1273 /* take the stream lock and start the streams */ 1274 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1275 { 1276 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1277 SNDRV_PCM_STATE_RUNNING); 1278 } 1279 1280 /* 1281 * stop callbacks 1282 */ 1283 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1284 { 1285 struct snd_pcm_runtime *runtime = substream->runtime; 1286 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1287 return -EBADFD; 1288 runtime->trigger_master = substream; 1289 return 0; 1290 } 1291 1292 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1293 { 1294 if (substream->runtime->trigger_master == substream && 1295 snd_pcm_running(substream)) 1296 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1297 return 0; /* unconditonally stop all substreams */ 1298 } 1299 1300 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1301 { 1302 struct snd_pcm_runtime *runtime = substream->runtime; 1303 if (runtime->status->state != state) { 1304 snd_pcm_trigger_tstamp(substream); 1305 runtime->status->state = state; 1306 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1307 } 1308 wake_up(&runtime->sleep); 1309 wake_up(&runtime->tsleep); 1310 } 1311 1312 static const struct action_ops snd_pcm_action_stop = { 1313 .pre_action = snd_pcm_pre_stop, 1314 .do_action = snd_pcm_do_stop, 1315 .post_action = snd_pcm_post_stop 1316 }; 1317 1318 /** 1319 * snd_pcm_stop - try to stop all running streams in the substream group 1320 * @substream: the PCM substream instance 1321 * @state: PCM state after stopping the stream 1322 * 1323 * The state of each stream is then changed to the given state unconditionally. 1324 * 1325 * Return: Zero if successful, or a negative error code. 1326 */ 1327 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1328 { 1329 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1330 } 1331 EXPORT_SYMBOL(snd_pcm_stop); 1332 1333 /** 1334 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1335 * @substream: the PCM substream 1336 * 1337 * After stopping, the state is changed to SETUP. 1338 * Unlike snd_pcm_stop(), this affects only the given stream. 1339 * 1340 * Return: Zero if succesful, or a negative error code. 1341 */ 1342 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1343 { 1344 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1345 SNDRV_PCM_STATE_SETUP); 1346 } 1347 1348 /** 1349 * snd_pcm_stop_xrun - stop the running streams as XRUN 1350 * @substream: the PCM substream instance 1351 * 1352 * This stops the given running substream (and all linked substreams) as XRUN. 1353 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1354 * 1355 * Return: Zero if successful, or a negative error code. 1356 */ 1357 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1358 { 1359 unsigned long flags; 1360 1361 snd_pcm_stream_lock_irqsave(substream, flags); 1362 if (substream->runtime && snd_pcm_running(substream)) 1363 __snd_pcm_xrun(substream); 1364 snd_pcm_stream_unlock_irqrestore(substream, flags); 1365 return 0; 1366 } 1367 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1368 1369 /* 1370 * pause callbacks 1371 */ 1372 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1373 { 1374 struct snd_pcm_runtime *runtime = substream->runtime; 1375 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1376 return -ENOSYS; 1377 if (push) { 1378 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1379 return -EBADFD; 1380 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1381 return -EBADFD; 1382 runtime->trigger_master = substream; 1383 return 0; 1384 } 1385 1386 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1387 { 1388 if (substream->runtime->trigger_master != substream) 1389 return 0; 1390 /* some drivers might use hw_ptr to recover from the pause - 1391 update the hw_ptr now */ 1392 if (push) 1393 snd_pcm_update_hw_ptr(substream); 1394 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1395 * a delta between the current jiffies, this gives a large enough 1396 * delta, effectively to skip the check once. 1397 */ 1398 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1399 return substream->ops->trigger(substream, 1400 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1401 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1402 } 1403 1404 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1405 { 1406 if (substream->runtime->trigger_master == substream) 1407 substream->ops->trigger(substream, 1408 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1409 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1410 } 1411 1412 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1413 { 1414 struct snd_pcm_runtime *runtime = substream->runtime; 1415 snd_pcm_trigger_tstamp(substream); 1416 if (push) { 1417 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1418 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1419 wake_up(&runtime->sleep); 1420 wake_up(&runtime->tsleep); 1421 } else { 1422 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1423 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1424 } 1425 } 1426 1427 static const struct action_ops snd_pcm_action_pause = { 1428 .pre_action = snd_pcm_pre_pause, 1429 .do_action = snd_pcm_do_pause, 1430 .undo_action = snd_pcm_undo_pause, 1431 .post_action = snd_pcm_post_pause 1432 }; 1433 1434 /* 1435 * Push/release the pause for all linked streams. 1436 */ 1437 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1438 { 1439 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1440 } 1441 1442 #ifdef CONFIG_PM 1443 /* suspend */ 1444 1445 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1446 { 1447 struct snd_pcm_runtime *runtime = substream->runtime; 1448 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1449 return -EBUSY; 1450 runtime->trigger_master = substream; 1451 return 0; 1452 } 1453 1454 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1455 { 1456 struct snd_pcm_runtime *runtime = substream->runtime; 1457 if (runtime->trigger_master != substream) 1458 return 0; 1459 if (! snd_pcm_running(substream)) 1460 return 0; 1461 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1462 return 0; /* suspend unconditionally */ 1463 } 1464 1465 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1466 { 1467 struct snd_pcm_runtime *runtime = substream->runtime; 1468 snd_pcm_trigger_tstamp(substream); 1469 runtime->status->suspended_state = runtime->status->state; 1470 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1471 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1472 wake_up(&runtime->sleep); 1473 wake_up(&runtime->tsleep); 1474 } 1475 1476 static const struct action_ops snd_pcm_action_suspend = { 1477 .pre_action = snd_pcm_pre_suspend, 1478 .do_action = snd_pcm_do_suspend, 1479 .post_action = snd_pcm_post_suspend 1480 }; 1481 1482 /** 1483 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1484 * @substream: the PCM substream 1485 * 1486 * After this call, all streams are changed to SUSPENDED state. 1487 * 1488 * Return: Zero if successful (or @substream is %NULL), or a negative error 1489 * code. 1490 */ 1491 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1492 { 1493 int err; 1494 unsigned long flags; 1495 1496 if (! substream) 1497 return 0; 1498 1499 snd_pcm_stream_lock_irqsave(substream, flags); 1500 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1501 snd_pcm_stream_unlock_irqrestore(substream, flags); 1502 return err; 1503 } 1504 EXPORT_SYMBOL(snd_pcm_suspend); 1505 1506 /** 1507 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1508 * @pcm: the PCM instance 1509 * 1510 * After this call, all streams are changed to SUSPENDED state. 1511 * 1512 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1513 */ 1514 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1515 { 1516 struct snd_pcm_substream *substream; 1517 int stream, err = 0; 1518 1519 if (! pcm) 1520 return 0; 1521 1522 for (stream = 0; stream < 2; stream++) { 1523 for (substream = pcm->streams[stream].substream; 1524 substream; substream = substream->next) { 1525 /* FIXME: the open/close code should lock this as well */ 1526 if (substream->runtime == NULL) 1527 continue; 1528 err = snd_pcm_suspend(substream); 1529 if (err < 0 && err != -EBUSY) 1530 return err; 1531 } 1532 } 1533 return 0; 1534 } 1535 EXPORT_SYMBOL(snd_pcm_suspend_all); 1536 1537 /* resume */ 1538 1539 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1540 { 1541 struct snd_pcm_runtime *runtime = substream->runtime; 1542 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1543 return -ENOSYS; 1544 runtime->trigger_master = substream; 1545 return 0; 1546 } 1547 1548 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1549 { 1550 struct snd_pcm_runtime *runtime = substream->runtime; 1551 if (runtime->trigger_master != substream) 1552 return 0; 1553 /* DMA not running previously? */ 1554 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1555 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1556 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1557 return 0; 1558 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1559 } 1560 1561 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1562 { 1563 if (substream->runtime->trigger_master == substream && 1564 snd_pcm_running(substream)) 1565 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1566 } 1567 1568 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1569 { 1570 struct snd_pcm_runtime *runtime = substream->runtime; 1571 snd_pcm_trigger_tstamp(substream); 1572 runtime->status->state = runtime->status->suspended_state; 1573 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1574 } 1575 1576 static const struct action_ops snd_pcm_action_resume = { 1577 .pre_action = snd_pcm_pre_resume, 1578 .do_action = snd_pcm_do_resume, 1579 .undo_action = snd_pcm_undo_resume, 1580 .post_action = snd_pcm_post_resume 1581 }; 1582 1583 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1584 { 1585 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1586 } 1587 1588 #else 1589 1590 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1591 { 1592 return -ENOSYS; 1593 } 1594 1595 #endif /* CONFIG_PM */ 1596 1597 /* 1598 * xrun ioctl 1599 * 1600 * Change the RUNNING stream(s) to XRUN state. 1601 */ 1602 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1603 { 1604 struct snd_pcm_runtime *runtime = substream->runtime; 1605 int result; 1606 1607 snd_pcm_stream_lock_irq(substream); 1608 switch (runtime->status->state) { 1609 case SNDRV_PCM_STATE_XRUN: 1610 result = 0; /* already there */ 1611 break; 1612 case SNDRV_PCM_STATE_RUNNING: 1613 __snd_pcm_xrun(substream); 1614 result = 0; 1615 break; 1616 default: 1617 result = -EBADFD; 1618 } 1619 snd_pcm_stream_unlock_irq(substream); 1620 return result; 1621 } 1622 1623 /* 1624 * reset ioctl 1625 */ 1626 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1627 { 1628 struct snd_pcm_runtime *runtime = substream->runtime; 1629 switch (runtime->status->state) { 1630 case SNDRV_PCM_STATE_RUNNING: 1631 case SNDRV_PCM_STATE_PREPARED: 1632 case SNDRV_PCM_STATE_PAUSED: 1633 case SNDRV_PCM_STATE_SUSPENDED: 1634 return 0; 1635 default: 1636 return -EBADFD; 1637 } 1638 } 1639 1640 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1641 { 1642 struct snd_pcm_runtime *runtime = substream->runtime; 1643 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1644 if (err < 0) 1645 return err; 1646 runtime->hw_ptr_base = 0; 1647 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1648 runtime->status->hw_ptr % runtime->period_size; 1649 runtime->silence_start = runtime->status->hw_ptr; 1650 runtime->silence_filled = 0; 1651 return 0; 1652 } 1653 1654 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1655 { 1656 struct snd_pcm_runtime *runtime = substream->runtime; 1657 runtime->control->appl_ptr = runtime->status->hw_ptr; 1658 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1659 runtime->silence_size > 0) 1660 snd_pcm_playback_silence(substream, ULONG_MAX); 1661 } 1662 1663 static const struct action_ops snd_pcm_action_reset = { 1664 .pre_action = snd_pcm_pre_reset, 1665 .do_action = snd_pcm_do_reset, 1666 .post_action = snd_pcm_post_reset 1667 }; 1668 1669 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1670 { 1671 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1672 } 1673 1674 /* 1675 * prepare ioctl 1676 */ 1677 /* we use the second argument for updating f_flags */ 1678 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1679 int f_flags) 1680 { 1681 struct snd_pcm_runtime *runtime = substream->runtime; 1682 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1683 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1684 return -EBADFD; 1685 if (snd_pcm_running(substream)) 1686 return -EBUSY; 1687 substream->f_flags = f_flags; 1688 return 0; 1689 } 1690 1691 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1692 { 1693 int err; 1694 err = substream->ops->prepare(substream); 1695 if (err < 0) 1696 return err; 1697 return snd_pcm_do_reset(substream, 0); 1698 } 1699 1700 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1701 { 1702 struct snd_pcm_runtime *runtime = substream->runtime; 1703 runtime->control->appl_ptr = runtime->status->hw_ptr; 1704 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1705 } 1706 1707 static const struct action_ops snd_pcm_action_prepare = { 1708 .pre_action = snd_pcm_pre_prepare, 1709 .do_action = snd_pcm_do_prepare, 1710 .post_action = snd_pcm_post_prepare 1711 }; 1712 1713 /** 1714 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1715 * @substream: the PCM substream instance 1716 * @file: file to refer f_flags 1717 * 1718 * Return: Zero if successful, or a negative error code. 1719 */ 1720 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1721 struct file *file) 1722 { 1723 int f_flags; 1724 1725 if (file) 1726 f_flags = file->f_flags; 1727 else 1728 f_flags = substream->f_flags; 1729 1730 snd_pcm_stream_lock_irq(substream); 1731 switch (substream->runtime->status->state) { 1732 case SNDRV_PCM_STATE_PAUSED: 1733 snd_pcm_pause(substream, 0); 1734 /* fallthru */ 1735 case SNDRV_PCM_STATE_SUSPENDED: 1736 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1737 break; 1738 } 1739 snd_pcm_stream_unlock_irq(substream); 1740 1741 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1742 substream, f_flags); 1743 } 1744 1745 /* 1746 * drain ioctl 1747 */ 1748 1749 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1750 { 1751 struct snd_pcm_runtime *runtime = substream->runtime; 1752 switch (runtime->status->state) { 1753 case SNDRV_PCM_STATE_OPEN: 1754 case SNDRV_PCM_STATE_DISCONNECTED: 1755 case SNDRV_PCM_STATE_SUSPENDED: 1756 return -EBADFD; 1757 } 1758 runtime->trigger_master = substream; 1759 return 0; 1760 } 1761 1762 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1763 { 1764 struct snd_pcm_runtime *runtime = substream->runtime; 1765 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1766 switch (runtime->status->state) { 1767 case SNDRV_PCM_STATE_PREPARED: 1768 /* start playback stream if possible */ 1769 if (! snd_pcm_playback_empty(substream)) { 1770 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1771 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1772 } else { 1773 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1774 } 1775 break; 1776 case SNDRV_PCM_STATE_RUNNING: 1777 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1778 break; 1779 case SNDRV_PCM_STATE_XRUN: 1780 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1781 break; 1782 default: 1783 break; 1784 } 1785 } else { 1786 /* stop running stream */ 1787 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1788 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1789 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1790 snd_pcm_do_stop(substream, new_state); 1791 snd_pcm_post_stop(substream, new_state); 1792 } 1793 } 1794 1795 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1796 runtime->trigger_master == substream && 1797 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1798 return substream->ops->trigger(substream, 1799 SNDRV_PCM_TRIGGER_DRAIN); 1800 1801 return 0; 1802 } 1803 1804 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1805 { 1806 } 1807 1808 static const struct action_ops snd_pcm_action_drain_init = { 1809 .pre_action = snd_pcm_pre_drain_init, 1810 .do_action = snd_pcm_do_drain_init, 1811 .post_action = snd_pcm_post_drain_init 1812 }; 1813 1814 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1815 1816 /* 1817 * Drain the stream(s). 1818 * When the substream is linked, sync until the draining of all playback streams 1819 * is finished. 1820 * After this call, all streams are supposed to be either SETUP or DRAINING 1821 * (capture only) state. 1822 */ 1823 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1824 struct file *file) 1825 { 1826 struct snd_card *card; 1827 struct snd_pcm_runtime *runtime; 1828 struct snd_pcm_substream *s; 1829 struct snd_pcm_group *group; 1830 wait_queue_entry_t wait; 1831 int result = 0; 1832 int nonblock = 0; 1833 1834 card = substream->pcm->card; 1835 runtime = substream->runtime; 1836 1837 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1838 return -EBADFD; 1839 1840 if (file) { 1841 if (file->f_flags & O_NONBLOCK) 1842 nonblock = 1; 1843 } else if (substream->f_flags & O_NONBLOCK) 1844 nonblock = 1; 1845 1846 snd_pcm_stream_lock_irq(substream); 1847 /* resume pause */ 1848 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1849 snd_pcm_pause(substream, 0); 1850 1851 /* pre-start/stop - all running streams are changed to DRAINING state */ 1852 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1853 if (result < 0) 1854 goto unlock; 1855 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1856 if (nonblock) { 1857 result = -EAGAIN; 1858 goto unlock; 1859 } 1860 1861 for (;;) { 1862 long tout; 1863 struct snd_pcm_runtime *to_check; 1864 if (signal_pending(current)) { 1865 result = -ERESTARTSYS; 1866 break; 1867 } 1868 /* find a substream to drain */ 1869 to_check = NULL; 1870 group = snd_pcm_stream_group_ref(substream); 1871 snd_pcm_group_for_each_entry(s, substream) { 1872 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1873 continue; 1874 runtime = s->runtime; 1875 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1876 to_check = runtime; 1877 break; 1878 } 1879 } 1880 snd_pcm_group_unref(group, substream); 1881 if (!to_check) 1882 break; /* all drained */ 1883 init_waitqueue_entry(&wait, current); 1884 add_wait_queue(&to_check->sleep, &wait); 1885 snd_pcm_stream_unlock_irq(substream); 1886 if (runtime->no_period_wakeup) 1887 tout = MAX_SCHEDULE_TIMEOUT; 1888 else { 1889 tout = 10; 1890 if (runtime->rate) { 1891 long t = runtime->period_size * 2 / runtime->rate; 1892 tout = max(t, tout); 1893 } 1894 tout = msecs_to_jiffies(tout * 1000); 1895 } 1896 tout = schedule_timeout_interruptible(tout); 1897 1898 snd_pcm_stream_lock_irq(substream); 1899 group = snd_pcm_stream_group_ref(substream); 1900 snd_pcm_group_for_each_entry(s, substream) { 1901 if (s->runtime == to_check) { 1902 remove_wait_queue(&to_check->sleep, &wait); 1903 break; 1904 } 1905 } 1906 snd_pcm_group_unref(group, substream); 1907 1908 if (card->shutdown) { 1909 result = -ENODEV; 1910 break; 1911 } 1912 if (tout == 0) { 1913 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1914 result = -ESTRPIPE; 1915 else { 1916 dev_dbg(substream->pcm->card->dev, 1917 "playback drain error (DMA or IRQ trouble?)\n"); 1918 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1919 result = -EIO; 1920 } 1921 break; 1922 } 1923 } 1924 1925 unlock: 1926 snd_pcm_stream_unlock_irq(substream); 1927 1928 return result; 1929 } 1930 1931 /* 1932 * drop ioctl 1933 * 1934 * Immediately put all linked substreams into SETUP state. 1935 */ 1936 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1937 { 1938 struct snd_pcm_runtime *runtime; 1939 int result = 0; 1940 1941 if (PCM_RUNTIME_CHECK(substream)) 1942 return -ENXIO; 1943 runtime = substream->runtime; 1944 1945 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1946 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1947 return -EBADFD; 1948 1949 snd_pcm_stream_lock_irq(substream); 1950 /* resume pause */ 1951 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1952 snd_pcm_pause(substream, 0); 1953 1954 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1955 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1956 snd_pcm_stream_unlock_irq(substream); 1957 1958 return result; 1959 } 1960 1961 1962 static bool is_pcm_file(struct file *file) 1963 { 1964 struct inode *inode = file_inode(file); 1965 struct snd_pcm *pcm; 1966 unsigned int minor; 1967 1968 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1969 return false; 1970 minor = iminor(inode); 1971 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 1972 if (!pcm) 1973 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1974 if (!pcm) 1975 return false; 1976 snd_card_unref(pcm->card); 1977 return true; 1978 } 1979 1980 /* 1981 * PCM link handling 1982 */ 1983 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1984 { 1985 int res = 0; 1986 struct snd_pcm_file *pcm_file; 1987 struct snd_pcm_substream *substream1; 1988 struct snd_pcm_group *group, *target_group; 1989 bool nonatomic = substream->pcm->nonatomic; 1990 struct fd f = fdget(fd); 1991 1992 if (!f.file) 1993 return -EBADFD; 1994 if (!is_pcm_file(f.file)) { 1995 res = -EBADFD; 1996 goto _badf; 1997 } 1998 pcm_file = f.file->private_data; 1999 substream1 = pcm_file->substream; 2000 group = kzalloc(sizeof(*group), GFP_KERNEL); 2001 if (!group) { 2002 res = -ENOMEM; 2003 goto _nolock; 2004 } 2005 snd_pcm_group_init(group); 2006 2007 down_write(&snd_pcm_link_rwsem); 2008 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 2009 substream->runtime->status->state != substream1->runtime->status->state || 2010 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2011 res = -EBADFD; 2012 goto _end; 2013 } 2014 if (snd_pcm_stream_linked(substream1)) { 2015 res = -EALREADY; 2016 goto _end; 2017 } 2018 2019 snd_pcm_stream_lock_irq(substream); 2020 if (!snd_pcm_stream_linked(substream)) { 2021 snd_pcm_group_assign(substream, group); 2022 group = NULL; /* assigned, don't free this one below */ 2023 } 2024 target_group = substream->group; 2025 snd_pcm_stream_unlock_irq(substream); 2026 2027 snd_pcm_group_lock_irq(target_group, nonatomic); 2028 snd_pcm_stream_lock(substream1); 2029 snd_pcm_group_assign(substream1, target_group); 2030 snd_pcm_stream_unlock(substream1); 2031 snd_pcm_group_unlock_irq(target_group, nonatomic); 2032 _end: 2033 up_write(&snd_pcm_link_rwsem); 2034 _nolock: 2035 kfree(group); 2036 _badf: 2037 fdput(f); 2038 return res; 2039 } 2040 2041 static void relink_to_local(struct snd_pcm_substream *substream) 2042 { 2043 snd_pcm_stream_lock(substream); 2044 snd_pcm_group_assign(substream, &substream->self_group); 2045 snd_pcm_stream_unlock(substream); 2046 } 2047 2048 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2049 { 2050 struct snd_pcm_group *group; 2051 bool nonatomic = substream->pcm->nonatomic; 2052 bool do_free = false; 2053 int res = 0; 2054 2055 down_write(&snd_pcm_link_rwsem); 2056 2057 if (!snd_pcm_stream_linked(substream)) { 2058 res = -EALREADY; 2059 goto _end; 2060 } 2061 2062 group = substream->group; 2063 snd_pcm_group_lock_irq(group, nonatomic); 2064 2065 relink_to_local(substream); 2066 2067 /* detach the last stream, too */ 2068 if (list_is_singular(&group->substreams)) { 2069 relink_to_local(list_first_entry(&group->substreams, 2070 struct snd_pcm_substream, 2071 link_list)); 2072 do_free = !refcount_read(&group->refs); 2073 } 2074 2075 snd_pcm_group_unlock_irq(group, nonatomic); 2076 if (do_free) 2077 kfree(group); 2078 2079 _end: 2080 up_write(&snd_pcm_link_rwsem); 2081 return res; 2082 } 2083 2084 /* 2085 * hw configurator 2086 */ 2087 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2088 struct snd_pcm_hw_rule *rule) 2089 { 2090 struct snd_interval t; 2091 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2092 hw_param_interval_c(params, rule->deps[1]), &t); 2093 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2094 } 2095 2096 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2097 struct snd_pcm_hw_rule *rule) 2098 { 2099 struct snd_interval t; 2100 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2101 hw_param_interval_c(params, rule->deps[1]), &t); 2102 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2103 } 2104 2105 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2106 struct snd_pcm_hw_rule *rule) 2107 { 2108 struct snd_interval t; 2109 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2110 hw_param_interval_c(params, rule->deps[1]), 2111 (unsigned long) rule->private, &t); 2112 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2113 } 2114 2115 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2116 struct snd_pcm_hw_rule *rule) 2117 { 2118 struct snd_interval t; 2119 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2120 (unsigned long) rule->private, 2121 hw_param_interval_c(params, rule->deps[1]), &t); 2122 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2123 } 2124 2125 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2126 struct snd_pcm_hw_rule *rule) 2127 { 2128 unsigned int k; 2129 const struct snd_interval *i = 2130 hw_param_interval_c(params, rule->deps[0]); 2131 struct snd_mask m; 2132 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2133 snd_mask_any(&m); 2134 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2135 int bits; 2136 if (! snd_mask_test(mask, k)) 2137 continue; 2138 bits = snd_pcm_format_physical_width(k); 2139 if (bits <= 0) 2140 continue; /* ignore invalid formats */ 2141 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2142 snd_mask_reset(&m, k); 2143 } 2144 return snd_mask_refine(mask, &m); 2145 } 2146 2147 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2148 struct snd_pcm_hw_rule *rule) 2149 { 2150 struct snd_interval t; 2151 unsigned int k; 2152 t.min = UINT_MAX; 2153 t.max = 0; 2154 t.openmin = 0; 2155 t.openmax = 0; 2156 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2157 int bits; 2158 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2159 continue; 2160 bits = snd_pcm_format_physical_width(k); 2161 if (bits <= 0) 2162 continue; /* ignore invalid formats */ 2163 if (t.min > (unsigned)bits) 2164 t.min = bits; 2165 if (t.max < (unsigned)bits) 2166 t.max = bits; 2167 } 2168 t.integer = 1; 2169 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2170 } 2171 2172 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2173 #error "Change this table" 2174 #endif 2175 2176 static const unsigned int rates[] = { 2177 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2178 48000, 64000, 88200, 96000, 176400, 192000 2179 }; 2180 2181 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2182 .count = ARRAY_SIZE(rates), 2183 .list = rates, 2184 }; 2185 2186 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2187 struct snd_pcm_hw_rule *rule) 2188 { 2189 struct snd_pcm_hardware *hw = rule->private; 2190 return snd_interval_list(hw_param_interval(params, rule->var), 2191 snd_pcm_known_rates.count, 2192 snd_pcm_known_rates.list, hw->rates); 2193 } 2194 2195 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2196 struct snd_pcm_hw_rule *rule) 2197 { 2198 struct snd_interval t; 2199 struct snd_pcm_substream *substream = rule->private; 2200 t.min = 0; 2201 t.max = substream->buffer_bytes_max; 2202 t.openmin = 0; 2203 t.openmax = 0; 2204 t.integer = 1; 2205 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2206 } 2207 2208 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2209 { 2210 struct snd_pcm_runtime *runtime = substream->runtime; 2211 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2212 int k, err; 2213 2214 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2215 snd_mask_any(constrs_mask(constrs, k)); 2216 } 2217 2218 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2219 snd_interval_any(constrs_interval(constrs, k)); 2220 } 2221 2222 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2223 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2224 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2225 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2226 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2227 2228 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2229 snd_pcm_hw_rule_format, NULL, 2230 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2231 if (err < 0) 2232 return err; 2233 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2234 snd_pcm_hw_rule_sample_bits, NULL, 2235 SNDRV_PCM_HW_PARAM_FORMAT, 2236 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2237 if (err < 0) 2238 return err; 2239 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2240 snd_pcm_hw_rule_div, NULL, 2241 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2242 if (err < 0) 2243 return err; 2244 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2245 snd_pcm_hw_rule_mul, NULL, 2246 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2247 if (err < 0) 2248 return err; 2249 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2250 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2251 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2252 if (err < 0) 2253 return err; 2254 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2255 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2256 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2257 if (err < 0) 2258 return err; 2259 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2260 snd_pcm_hw_rule_div, NULL, 2261 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2262 if (err < 0) 2263 return err; 2264 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2265 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2266 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2267 if (err < 0) 2268 return err; 2269 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2270 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2271 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2272 if (err < 0) 2273 return err; 2274 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2275 snd_pcm_hw_rule_div, NULL, 2276 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2277 if (err < 0) 2278 return err; 2279 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2280 snd_pcm_hw_rule_div, NULL, 2281 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2282 if (err < 0) 2283 return err; 2284 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2285 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2286 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2287 if (err < 0) 2288 return err; 2289 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2290 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2291 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2292 if (err < 0) 2293 return err; 2294 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2295 snd_pcm_hw_rule_mul, NULL, 2296 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2297 if (err < 0) 2298 return err; 2299 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2300 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2301 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2302 if (err < 0) 2303 return err; 2304 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2305 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2306 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2307 if (err < 0) 2308 return err; 2309 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2310 snd_pcm_hw_rule_muldivk, (void*) 8, 2311 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2312 if (err < 0) 2313 return err; 2314 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2315 snd_pcm_hw_rule_muldivk, (void*) 8, 2316 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2317 if (err < 0) 2318 return err; 2319 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2320 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2321 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2322 if (err < 0) 2323 return err; 2324 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2325 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2326 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2327 if (err < 0) 2328 return err; 2329 return 0; 2330 } 2331 2332 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2333 { 2334 struct snd_pcm_runtime *runtime = substream->runtime; 2335 struct snd_pcm_hardware *hw = &runtime->hw; 2336 int err; 2337 unsigned int mask = 0; 2338 2339 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2340 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2341 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2342 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2343 if (hw_support_mmap(substream)) { 2344 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2345 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2346 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2347 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2348 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2349 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2350 } 2351 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2352 if (err < 0) 2353 return err; 2354 2355 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2356 if (err < 0) 2357 return err; 2358 2359 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2360 if (err < 0) 2361 return err; 2362 2363 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2364 hw->channels_min, hw->channels_max); 2365 if (err < 0) 2366 return err; 2367 2368 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2369 hw->rate_min, hw->rate_max); 2370 if (err < 0) 2371 return err; 2372 2373 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2374 hw->period_bytes_min, hw->period_bytes_max); 2375 if (err < 0) 2376 return err; 2377 2378 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2379 hw->periods_min, hw->periods_max); 2380 if (err < 0) 2381 return err; 2382 2383 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2384 hw->period_bytes_min, hw->buffer_bytes_max); 2385 if (err < 0) 2386 return err; 2387 2388 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2389 snd_pcm_hw_rule_buffer_bytes_max, substream, 2390 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2391 if (err < 0) 2392 return err; 2393 2394 /* FIXME: remove */ 2395 if (runtime->dma_bytes) { 2396 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2397 if (err < 0) 2398 return err; 2399 } 2400 2401 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2402 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2403 snd_pcm_hw_rule_rate, hw, 2404 SNDRV_PCM_HW_PARAM_RATE, -1); 2405 if (err < 0) 2406 return err; 2407 } 2408 2409 /* FIXME: this belong to lowlevel */ 2410 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2411 2412 return 0; 2413 } 2414 2415 static void pcm_release_private(struct snd_pcm_substream *substream) 2416 { 2417 if (snd_pcm_stream_linked(substream)) 2418 snd_pcm_unlink(substream); 2419 } 2420 2421 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2422 { 2423 substream->ref_count--; 2424 if (substream->ref_count > 0) 2425 return; 2426 2427 snd_pcm_drop(substream); 2428 if (substream->hw_opened) { 2429 if (substream->ops->hw_free && 2430 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2431 substream->ops->hw_free(substream); 2432 substream->ops->close(substream); 2433 substream->hw_opened = 0; 2434 } 2435 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2436 pm_qos_remove_request(&substream->latency_pm_qos_req); 2437 if (substream->pcm_release) { 2438 substream->pcm_release(substream); 2439 substream->pcm_release = NULL; 2440 } 2441 snd_pcm_detach_substream(substream); 2442 } 2443 EXPORT_SYMBOL(snd_pcm_release_substream); 2444 2445 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2446 struct file *file, 2447 struct snd_pcm_substream **rsubstream) 2448 { 2449 struct snd_pcm_substream *substream; 2450 int err; 2451 2452 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2453 if (err < 0) 2454 return err; 2455 if (substream->ref_count > 1) { 2456 *rsubstream = substream; 2457 return 0; 2458 } 2459 2460 err = snd_pcm_hw_constraints_init(substream); 2461 if (err < 0) { 2462 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2463 goto error; 2464 } 2465 2466 if ((err = substream->ops->open(substream)) < 0) 2467 goto error; 2468 2469 substream->hw_opened = 1; 2470 2471 err = snd_pcm_hw_constraints_complete(substream); 2472 if (err < 0) { 2473 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2474 goto error; 2475 } 2476 2477 *rsubstream = substream; 2478 return 0; 2479 2480 error: 2481 snd_pcm_release_substream(substream); 2482 return err; 2483 } 2484 EXPORT_SYMBOL(snd_pcm_open_substream); 2485 2486 static int snd_pcm_open_file(struct file *file, 2487 struct snd_pcm *pcm, 2488 int stream) 2489 { 2490 struct snd_pcm_file *pcm_file; 2491 struct snd_pcm_substream *substream; 2492 int err; 2493 2494 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2495 if (err < 0) 2496 return err; 2497 2498 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2499 if (pcm_file == NULL) { 2500 snd_pcm_release_substream(substream); 2501 return -ENOMEM; 2502 } 2503 pcm_file->substream = substream; 2504 if (substream->ref_count == 1) { 2505 substream->file = pcm_file; 2506 substream->pcm_release = pcm_release_private; 2507 } 2508 file->private_data = pcm_file; 2509 2510 return 0; 2511 } 2512 2513 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2514 { 2515 struct snd_pcm *pcm; 2516 int err = nonseekable_open(inode, file); 2517 if (err < 0) 2518 return err; 2519 pcm = snd_lookup_minor_data(iminor(inode), 2520 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2521 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2522 if (pcm) 2523 snd_card_unref(pcm->card); 2524 return err; 2525 } 2526 2527 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2528 { 2529 struct snd_pcm *pcm; 2530 int err = nonseekable_open(inode, file); 2531 if (err < 0) 2532 return err; 2533 pcm = snd_lookup_minor_data(iminor(inode), 2534 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2535 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2536 if (pcm) 2537 snd_card_unref(pcm->card); 2538 return err; 2539 } 2540 2541 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2542 { 2543 int err; 2544 wait_queue_entry_t wait; 2545 2546 if (pcm == NULL) { 2547 err = -ENODEV; 2548 goto __error1; 2549 } 2550 err = snd_card_file_add(pcm->card, file); 2551 if (err < 0) 2552 goto __error1; 2553 if (!try_module_get(pcm->card->module)) { 2554 err = -EFAULT; 2555 goto __error2; 2556 } 2557 init_waitqueue_entry(&wait, current); 2558 add_wait_queue(&pcm->open_wait, &wait); 2559 mutex_lock(&pcm->open_mutex); 2560 while (1) { 2561 err = snd_pcm_open_file(file, pcm, stream); 2562 if (err >= 0) 2563 break; 2564 if (err == -EAGAIN) { 2565 if (file->f_flags & O_NONBLOCK) { 2566 err = -EBUSY; 2567 break; 2568 } 2569 } else 2570 break; 2571 set_current_state(TASK_INTERRUPTIBLE); 2572 mutex_unlock(&pcm->open_mutex); 2573 schedule(); 2574 mutex_lock(&pcm->open_mutex); 2575 if (pcm->card->shutdown) { 2576 err = -ENODEV; 2577 break; 2578 } 2579 if (signal_pending(current)) { 2580 err = -ERESTARTSYS; 2581 break; 2582 } 2583 } 2584 remove_wait_queue(&pcm->open_wait, &wait); 2585 mutex_unlock(&pcm->open_mutex); 2586 if (err < 0) 2587 goto __error; 2588 return err; 2589 2590 __error: 2591 module_put(pcm->card->module); 2592 __error2: 2593 snd_card_file_remove(pcm->card, file); 2594 __error1: 2595 return err; 2596 } 2597 2598 static int snd_pcm_release(struct inode *inode, struct file *file) 2599 { 2600 struct snd_pcm *pcm; 2601 struct snd_pcm_substream *substream; 2602 struct snd_pcm_file *pcm_file; 2603 2604 pcm_file = file->private_data; 2605 substream = pcm_file->substream; 2606 if (snd_BUG_ON(!substream)) 2607 return -ENXIO; 2608 pcm = substream->pcm; 2609 mutex_lock(&pcm->open_mutex); 2610 snd_pcm_release_substream(substream); 2611 kfree(pcm_file); 2612 mutex_unlock(&pcm->open_mutex); 2613 wake_up(&pcm->open_wait); 2614 module_put(pcm->card->module); 2615 snd_card_file_remove(pcm->card, file); 2616 return 0; 2617 } 2618 2619 /* check and update PCM state; return 0 or a negative error 2620 * call this inside PCM lock 2621 */ 2622 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2623 { 2624 switch (substream->runtime->status->state) { 2625 case SNDRV_PCM_STATE_DRAINING: 2626 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2627 return -EBADFD; 2628 /* Fall through */ 2629 case SNDRV_PCM_STATE_RUNNING: 2630 return snd_pcm_update_hw_ptr(substream); 2631 case SNDRV_PCM_STATE_PREPARED: 2632 case SNDRV_PCM_STATE_PAUSED: 2633 return 0; 2634 case SNDRV_PCM_STATE_SUSPENDED: 2635 return -ESTRPIPE; 2636 case SNDRV_PCM_STATE_XRUN: 2637 return -EPIPE; 2638 default: 2639 return -EBADFD; 2640 } 2641 } 2642 2643 /* increase the appl_ptr; returns the processed frames or a negative error */ 2644 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2645 snd_pcm_uframes_t frames, 2646 snd_pcm_sframes_t avail) 2647 { 2648 struct snd_pcm_runtime *runtime = substream->runtime; 2649 snd_pcm_sframes_t appl_ptr; 2650 int ret; 2651 2652 if (avail <= 0) 2653 return 0; 2654 if (frames > (snd_pcm_uframes_t)avail) 2655 frames = avail; 2656 appl_ptr = runtime->control->appl_ptr + frames; 2657 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2658 appl_ptr -= runtime->boundary; 2659 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2660 return ret < 0 ? ret : frames; 2661 } 2662 2663 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2664 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2665 snd_pcm_uframes_t frames, 2666 snd_pcm_sframes_t avail) 2667 { 2668 struct snd_pcm_runtime *runtime = substream->runtime; 2669 snd_pcm_sframes_t appl_ptr; 2670 int ret; 2671 2672 if (avail <= 0) 2673 return 0; 2674 if (frames > (snd_pcm_uframes_t)avail) 2675 frames = avail; 2676 appl_ptr = runtime->control->appl_ptr - frames; 2677 if (appl_ptr < 0) 2678 appl_ptr += runtime->boundary; 2679 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2680 /* NOTE: we return zero for errors because PulseAudio gets depressed 2681 * upon receiving an error from rewind ioctl and stops processing 2682 * any longer. Returning zero means that no rewind is done, so 2683 * it's not absolutely wrong to answer like that. 2684 */ 2685 return ret < 0 ? 0 : frames; 2686 } 2687 2688 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2689 snd_pcm_uframes_t frames) 2690 { 2691 snd_pcm_sframes_t ret; 2692 2693 if (frames == 0) 2694 return 0; 2695 2696 snd_pcm_stream_lock_irq(substream); 2697 ret = do_pcm_hwsync(substream); 2698 if (!ret) 2699 ret = rewind_appl_ptr(substream, frames, 2700 snd_pcm_hw_avail(substream)); 2701 snd_pcm_stream_unlock_irq(substream); 2702 return ret; 2703 } 2704 2705 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2706 snd_pcm_uframes_t frames) 2707 { 2708 snd_pcm_sframes_t ret; 2709 2710 if (frames == 0) 2711 return 0; 2712 2713 snd_pcm_stream_lock_irq(substream); 2714 ret = do_pcm_hwsync(substream); 2715 if (!ret) 2716 ret = forward_appl_ptr(substream, frames, 2717 snd_pcm_avail(substream)); 2718 snd_pcm_stream_unlock_irq(substream); 2719 return ret; 2720 } 2721 2722 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2723 { 2724 int err; 2725 2726 snd_pcm_stream_lock_irq(substream); 2727 err = do_pcm_hwsync(substream); 2728 snd_pcm_stream_unlock_irq(substream); 2729 return err; 2730 } 2731 2732 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2733 snd_pcm_sframes_t *delay) 2734 { 2735 int err; 2736 snd_pcm_sframes_t n = 0; 2737 2738 snd_pcm_stream_lock_irq(substream); 2739 err = do_pcm_hwsync(substream); 2740 if (!err) 2741 n = snd_pcm_calc_delay(substream); 2742 snd_pcm_stream_unlock_irq(substream); 2743 if (!err) 2744 *delay = n; 2745 return err; 2746 } 2747 2748 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2749 struct snd_pcm_sync_ptr __user *_sync_ptr) 2750 { 2751 struct snd_pcm_runtime *runtime = substream->runtime; 2752 struct snd_pcm_sync_ptr sync_ptr; 2753 volatile struct snd_pcm_mmap_status *status; 2754 volatile struct snd_pcm_mmap_control *control; 2755 int err; 2756 2757 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2758 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2759 return -EFAULT; 2760 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2761 return -EFAULT; 2762 status = runtime->status; 2763 control = runtime->control; 2764 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2765 err = snd_pcm_hwsync(substream); 2766 if (err < 0) 2767 return err; 2768 } 2769 snd_pcm_stream_lock_irq(substream); 2770 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2771 err = pcm_lib_apply_appl_ptr(substream, 2772 sync_ptr.c.control.appl_ptr); 2773 if (err < 0) { 2774 snd_pcm_stream_unlock_irq(substream); 2775 return err; 2776 } 2777 } else { 2778 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2779 } 2780 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2781 control->avail_min = sync_ptr.c.control.avail_min; 2782 else 2783 sync_ptr.c.control.avail_min = control->avail_min; 2784 sync_ptr.s.status.state = status->state; 2785 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2786 sync_ptr.s.status.tstamp = status->tstamp; 2787 sync_ptr.s.status.suspended_state = status->suspended_state; 2788 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2789 snd_pcm_stream_unlock_irq(substream); 2790 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2791 return -EFAULT; 2792 return 0; 2793 } 2794 2795 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2796 { 2797 struct snd_pcm_runtime *runtime = substream->runtime; 2798 int arg; 2799 2800 if (get_user(arg, _arg)) 2801 return -EFAULT; 2802 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2803 return -EINVAL; 2804 runtime->tstamp_type = arg; 2805 return 0; 2806 } 2807 2808 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2809 struct snd_xferi __user *_xferi) 2810 { 2811 struct snd_xferi xferi; 2812 struct snd_pcm_runtime *runtime = substream->runtime; 2813 snd_pcm_sframes_t result; 2814 2815 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2816 return -EBADFD; 2817 if (put_user(0, &_xferi->result)) 2818 return -EFAULT; 2819 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2820 return -EFAULT; 2821 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2822 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2823 else 2824 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2825 __put_user(result, &_xferi->result); 2826 return result < 0 ? result : 0; 2827 } 2828 2829 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2830 struct snd_xfern __user *_xfern) 2831 { 2832 struct snd_xfern xfern; 2833 struct snd_pcm_runtime *runtime = substream->runtime; 2834 void *bufs; 2835 snd_pcm_sframes_t result; 2836 2837 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2838 return -EBADFD; 2839 if (runtime->channels > 128) 2840 return -EINVAL; 2841 if (put_user(0, &_xfern->result)) 2842 return -EFAULT; 2843 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2844 return -EFAULT; 2845 2846 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2847 if (IS_ERR(bufs)) 2848 return PTR_ERR(bufs); 2849 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2850 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2851 else 2852 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2853 kfree(bufs); 2854 __put_user(result, &_xfern->result); 2855 return result < 0 ? result : 0; 2856 } 2857 2858 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2859 snd_pcm_uframes_t __user *_frames) 2860 { 2861 snd_pcm_uframes_t frames; 2862 snd_pcm_sframes_t result; 2863 2864 if (get_user(frames, _frames)) 2865 return -EFAULT; 2866 if (put_user(0, _frames)) 2867 return -EFAULT; 2868 result = snd_pcm_rewind(substream, frames); 2869 __put_user(result, _frames); 2870 return result < 0 ? result : 0; 2871 } 2872 2873 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2874 snd_pcm_uframes_t __user *_frames) 2875 { 2876 snd_pcm_uframes_t frames; 2877 snd_pcm_sframes_t result; 2878 2879 if (get_user(frames, _frames)) 2880 return -EFAULT; 2881 if (put_user(0, _frames)) 2882 return -EFAULT; 2883 result = snd_pcm_forward(substream, frames); 2884 __put_user(result, _frames); 2885 return result < 0 ? result : 0; 2886 } 2887 2888 static int snd_pcm_common_ioctl(struct file *file, 2889 struct snd_pcm_substream *substream, 2890 unsigned int cmd, void __user *arg) 2891 { 2892 struct snd_pcm_file *pcm_file = file->private_data; 2893 int res; 2894 2895 if (PCM_RUNTIME_CHECK(substream)) 2896 return -ENXIO; 2897 2898 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2899 if (res < 0) 2900 return res; 2901 2902 switch (cmd) { 2903 case SNDRV_PCM_IOCTL_PVERSION: 2904 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2905 case SNDRV_PCM_IOCTL_INFO: 2906 return snd_pcm_info_user(substream, arg); 2907 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2908 return 0; 2909 case SNDRV_PCM_IOCTL_TTSTAMP: 2910 return snd_pcm_tstamp(substream, arg); 2911 case SNDRV_PCM_IOCTL_USER_PVERSION: 2912 if (get_user(pcm_file->user_pversion, 2913 (unsigned int __user *)arg)) 2914 return -EFAULT; 2915 return 0; 2916 case SNDRV_PCM_IOCTL_HW_REFINE: 2917 return snd_pcm_hw_refine_user(substream, arg); 2918 case SNDRV_PCM_IOCTL_HW_PARAMS: 2919 return snd_pcm_hw_params_user(substream, arg); 2920 case SNDRV_PCM_IOCTL_HW_FREE: 2921 return snd_pcm_hw_free(substream); 2922 case SNDRV_PCM_IOCTL_SW_PARAMS: 2923 return snd_pcm_sw_params_user(substream, arg); 2924 case SNDRV_PCM_IOCTL_STATUS: 2925 return snd_pcm_status_user(substream, arg, false); 2926 case SNDRV_PCM_IOCTL_STATUS_EXT: 2927 return snd_pcm_status_user(substream, arg, true); 2928 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2929 return snd_pcm_channel_info_user(substream, arg); 2930 case SNDRV_PCM_IOCTL_PREPARE: 2931 return snd_pcm_prepare(substream, file); 2932 case SNDRV_PCM_IOCTL_RESET: 2933 return snd_pcm_reset(substream); 2934 case SNDRV_PCM_IOCTL_START: 2935 return snd_pcm_start_lock_irq(substream); 2936 case SNDRV_PCM_IOCTL_LINK: 2937 return snd_pcm_link(substream, (int)(unsigned long) arg); 2938 case SNDRV_PCM_IOCTL_UNLINK: 2939 return snd_pcm_unlink(substream); 2940 case SNDRV_PCM_IOCTL_RESUME: 2941 return snd_pcm_resume(substream); 2942 case SNDRV_PCM_IOCTL_XRUN: 2943 return snd_pcm_xrun(substream); 2944 case SNDRV_PCM_IOCTL_HWSYNC: 2945 return snd_pcm_hwsync(substream); 2946 case SNDRV_PCM_IOCTL_DELAY: 2947 { 2948 snd_pcm_sframes_t delay; 2949 snd_pcm_sframes_t __user *res = arg; 2950 int err; 2951 2952 err = snd_pcm_delay(substream, &delay); 2953 if (err) 2954 return err; 2955 if (put_user(delay, res)) 2956 return -EFAULT; 2957 return 0; 2958 } 2959 case SNDRV_PCM_IOCTL_SYNC_PTR: 2960 return snd_pcm_sync_ptr(substream, arg); 2961 #ifdef CONFIG_SND_SUPPORT_OLD_API 2962 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2963 return snd_pcm_hw_refine_old_user(substream, arg); 2964 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2965 return snd_pcm_hw_params_old_user(substream, arg); 2966 #endif 2967 case SNDRV_PCM_IOCTL_DRAIN: 2968 return snd_pcm_drain(substream, file); 2969 case SNDRV_PCM_IOCTL_DROP: 2970 return snd_pcm_drop(substream); 2971 case SNDRV_PCM_IOCTL_PAUSE: 2972 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2973 substream, 2974 (int)(unsigned long)arg); 2975 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2976 case SNDRV_PCM_IOCTL_READI_FRAMES: 2977 return snd_pcm_xferi_frames_ioctl(substream, arg); 2978 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2979 case SNDRV_PCM_IOCTL_READN_FRAMES: 2980 return snd_pcm_xfern_frames_ioctl(substream, arg); 2981 case SNDRV_PCM_IOCTL_REWIND: 2982 return snd_pcm_rewind_ioctl(substream, arg); 2983 case SNDRV_PCM_IOCTL_FORWARD: 2984 return snd_pcm_forward_ioctl(substream, arg); 2985 } 2986 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2987 return -ENOTTY; 2988 } 2989 2990 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 2991 unsigned long arg) 2992 { 2993 struct snd_pcm_file *pcm_file; 2994 2995 pcm_file = file->private_data; 2996 2997 if (((cmd >> 8) & 0xff) != 'A') 2998 return -ENOTTY; 2999 3000 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 3001 (void __user *)arg); 3002 } 3003 3004 /** 3005 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3006 * @substream: PCM substream 3007 * @cmd: IOCTL cmd 3008 * @arg: IOCTL argument 3009 * 3010 * The function is provided primarily for OSS layer and USB gadget drivers, 3011 * and it allows only the limited set of ioctls (hw_params, sw_params, 3012 * prepare, start, drain, drop, forward). 3013 */ 3014 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3015 unsigned int cmd, void *arg) 3016 { 3017 snd_pcm_uframes_t *frames = arg; 3018 snd_pcm_sframes_t result; 3019 3020 switch (cmd) { 3021 case SNDRV_PCM_IOCTL_FORWARD: 3022 { 3023 /* provided only for OSS; capture-only and no value returned */ 3024 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3025 return -EINVAL; 3026 result = snd_pcm_forward(substream, *frames); 3027 return result < 0 ? result : 0; 3028 } 3029 case SNDRV_PCM_IOCTL_HW_PARAMS: 3030 return snd_pcm_hw_params(substream, arg); 3031 case SNDRV_PCM_IOCTL_SW_PARAMS: 3032 return snd_pcm_sw_params(substream, arg); 3033 case SNDRV_PCM_IOCTL_PREPARE: 3034 return snd_pcm_prepare(substream, NULL); 3035 case SNDRV_PCM_IOCTL_START: 3036 return snd_pcm_start_lock_irq(substream); 3037 case SNDRV_PCM_IOCTL_DRAIN: 3038 return snd_pcm_drain(substream, NULL); 3039 case SNDRV_PCM_IOCTL_DROP: 3040 return snd_pcm_drop(substream); 3041 case SNDRV_PCM_IOCTL_DELAY: 3042 return snd_pcm_delay(substream, frames); 3043 default: 3044 return -EINVAL; 3045 } 3046 } 3047 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3048 3049 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3050 loff_t * offset) 3051 { 3052 struct snd_pcm_file *pcm_file; 3053 struct snd_pcm_substream *substream; 3054 struct snd_pcm_runtime *runtime; 3055 snd_pcm_sframes_t result; 3056 3057 pcm_file = file->private_data; 3058 substream = pcm_file->substream; 3059 if (PCM_RUNTIME_CHECK(substream)) 3060 return -ENXIO; 3061 runtime = substream->runtime; 3062 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3063 return -EBADFD; 3064 if (!frame_aligned(runtime, count)) 3065 return -EINVAL; 3066 count = bytes_to_frames(runtime, count); 3067 result = snd_pcm_lib_read(substream, buf, count); 3068 if (result > 0) 3069 result = frames_to_bytes(runtime, result); 3070 return result; 3071 } 3072 3073 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3074 size_t count, loff_t * offset) 3075 { 3076 struct snd_pcm_file *pcm_file; 3077 struct snd_pcm_substream *substream; 3078 struct snd_pcm_runtime *runtime; 3079 snd_pcm_sframes_t result; 3080 3081 pcm_file = file->private_data; 3082 substream = pcm_file->substream; 3083 if (PCM_RUNTIME_CHECK(substream)) 3084 return -ENXIO; 3085 runtime = substream->runtime; 3086 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3087 return -EBADFD; 3088 if (!frame_aligned(runtime, count)) 3089 return -EINVAL; 3090 count = bytes_to_frames(runtime, count); 3091 result = snd_pcm_lib_write(substream, buf, count); 3092 if (result > 0) 3093 result = frames_to_bytes(runtime, result); 3094 return result; 3095 } 3096 3097 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3098 { 3099 struct snd_pcm_file *pcm_file; 3100 struct snd_pcm_substream *substream; 3101 struct snd_pcm_runtime *runtime; 3102 snd_pcm_sframes_t result; 3103 unsigned long i; 3104 void __user **bufs; 3105 snd_pcm_uframes_t frames; 3106 3107 pcm_file = iocb->ki_filp->private_data; 3108 substream = pcm_file->substream; 3109 if (PCM_RUNTIME_CHECK(substream)) 3110 return -ENXIO; 3111 runtime = substream->runtime; 3112 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3113 return -EBADFD; 3114 if (!iter_is_iovec(to)) 3115 return -EINVAL; 3116 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3117 return -EINVAL; 3118 if (!frame_aligned(runtime, to->iov->iov_len)) 3119 return -EINVAL; 3120 frames = bytes_to_samples(runtime, to->iov->iov_len); 3121 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3122 if (bufs == NULL) 3123 return -ENOMEM; 3124 for (i = 0; i < to->nr_segs; ++i) 3125 bufs[i] = to->iov[i].iov_base; 3126 result = snd_pcm_lib_readv(substream, bufs, frames); 3127 if (result > 0) 3128 result = frames_to_bytes(runtime, result); 3129 kfree(bufs); 3130 return result; 3131 } 3132 3133 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3134 { 3135 struct snd_pcm_file *pcm_file; 3136 struct snd_pcm_substream *substream; 3137 struct snd_pcm_runtime *runtime; 3138 snd_pcm_sframes_t result; 3139 unsigned long i; 3140 void __user **bufs; 3141 snd_pcm_uframes_t frames; 3142 3143 pcm_file = iocb->ki_filp->private_data; 3144 substream = pcm_file->substream; 3145 if (PCM_RUNTIME_CHECK(substream)) 3146 return -ENXIO; 3147 runtime = substream->runtime; 3148 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3149 return -EBADFD; 3150 if (!iter_is_iovec(from)) 3151 return -EINVAL; 3152 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3153 !frame_aligned(runtime, from->iov->iov_len)) 3154 return -EINVAL; 3155 frames = bytes_to_samples(runtime, from->iov->iov_len); 3156 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3157 if (bufs == NULL) 3158 return -ENOMEM; 3159 for (i = 0; i < from->nr_segs; ++i) 3160 bufs[i] = from->iov[i].iov_base; 3161 result = snd_pcm_lib_writev(substream, bufs, frames); 3162 if (result > 0) 3163 result = frames_to_bytes(runtime, result); 3164 kfree(bufs); 3165 return result; 3166 } 3167 3168 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3169 { 3170 struct snd_pcm_file *pcm_file; 3171 struct snd_pcm_substream *substream; 3172 struct snd_pcm_runtime *runtime; 3173 __poll_t mask, ok; 3174 snd_pcm_uframes_t avail; 3175 3176 pcm_file = file->private_data; 3177 3178 substream = pcm_file->substream; 3179 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3180 ok = EPOLLOUT | EPOLLWRNORM; 3181 else 3182 ok = EPOLLIN | EPOLLRDNORM; 3183 if (PCM_RUNTIME_CHECK(substream)) 3184 return ok | EPOLLERR; 3185 3186 runtime = substream->runtime; 3187 poll_wait(file, &runtime->sleep, wait); 3188 3189 mask = 0; 3190 snd_pcm_stream_lock_irq(substream); 3191 avail = snd_pcm_avail(substream); 3192 switch (runtime->status->state) { 3193 case SNDRV_PCM_STATE_RUNNING: 3194 case SNDRV_PCM_STATE_PREPARED: 3195 case SNDRV_PCM_STATE_PAUSED: 3196 if (avail >= runtime->control->avail_min) 3197 mask = ok; 3198 break; 3199 case SNDRV_PCM_STATE_DRAINING: 3200 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3201 mask = ok; 3202 if (!avail) 3203 mask |= EPOLLERR; 3204 } 3205 break; 3206 default: 3207 mask = ok | EPOLLERR; 3208 break; 3209 } 3210 snd_pcm_stream_unlock_irq(substream); 3211 return mask; 3212 } 3213 3214 /* 3215 * mmap support 3216 */ 3217 3218 /* 3219 * Only on coherent architectures, we can mmap the status and the control records 3220 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3221 */ 3222 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3223 /* 3224 * mmap status record 3225 */ 3226 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3227 { 3228 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3229 struct snd_pcm_runtime *runtime; 3230 3231 if (substream == NULL) 3232 return VM_FAULT_SIGBUS; 3233 runtime = substream->runtime; 3234 vmf->page = virt_to_page(runtime->status); 3235 get_page(vmf->page); 3236 return 0; 3237 } 3238 3239 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3240 { 3241 .fault = snd_pcm_mmap_status_fault, 3242 }; 3243 3244 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3245 struct vm_area_struct *area) 3246 { 3247 long size; 3248 if (!(area->vm_flags & VM_READ)) 3249 return -EINVAL; 3250 size = area->vm_end - area->vm_start; 3251 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3252 return -EINVAL; 3253 area->vm_ops = &snd_pcm_vm_ops_status; 3254 area->vm_private_data = substream; 3255 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3256 return 0; 3257 } 3258 3259 /* 3260 * mmap control record 3261 */ 3262 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3263 { 3264 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3265 struct snd_pcm_runtime *runtime; 3266 3267 if (substream == NULL) 3268 return VM_FAULT_SIGBUS; 3269 runtime = substream->runtime; 3270 vmf->page = virt_to_page(runtime->control); 3271 get_page(vmf->page); 3272 return 0; 3273 } 3274 3275 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3276 { 3277 .fault = snd_pcm_mmap_control_fault, 3278 }; 3279 3280 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3281 struct vm_area_struct *area) 3282 { 3283 long size; 3284 if (!(area->vm_flags & VM_READ)) 3285 return -EINVAL; 3286 size = area->vm_end - area->vm_start; 3287 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3288 return -EINVAL; 3289 area->vm_ops = &snd_pcm_vm_ops_control; 3290 area->vm_private_data = substream; 3291 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3292 return 0; 3293 } 3294 3295 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3296 { 3297 if (pcm_file->no_compat_mmap) 3298 return false; 3299 /* See pcm_control_mmap_allowed() below. 3300 * Since older alsa-lib requires both status and control mmaps to be 3301 * coupled, we have to disable the status mmap for old alsa-lib, too. 3302 */ 3303 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3304 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3305 return false; 3306 return true; 3307 } 3308 3309 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3310 { 3311 if (pcm_file->no_compat_mmap) 3312 return false; 3313 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3314 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3315 * thus it effectively assures the manual update of appl_ptr. 3316 */ 3317 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3318 return false; 3319 return true; 3320 } 3321 3322 #else /* ! coherent mmap */ 3323 /* 3324 * don't support mmap for status and control records. 3325 */ 3326 #define pcm_status_mmap_allowed(pcm_file) false 3327 #define pcm_control_mmap_allowed(pcm_file) false 3328 3329 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3330 struct vm_area_struct *area) 3331 { 3332 return -ENXIO; 3333 } 3334 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3335 struct vm_area_struct *area) 3336 { 3337 return -ENXIO; 3338 } 3339 #endif /* coherent mmap */ 3340 3341 static inline struct page * 3342 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3343 { 3344 void *vaddr = substream->runtime->dma_area + ofs; 3345 return virt_to_page(vaddr); 3346 } 3347 3348 /* 3349 * fault callback for mmapping a RAM page 3350 */ 3351 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3352 { 3353 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3354 struct snd_pcm_runtime *runtime; 3355 unsigned long offset; 3356 struct page * page; 3357 size_t dma_bytes; 3358 3359 if (substream == NULL) 3360 return VM_FAULT_SIGBUS; 3361 runtime = substream->runtime; 3362 offset = vmf->pgoff << PAGE_SHIFT; 3363 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3364 if (offset > dma_bytes - PAGE_SIZE) 3365 return VM_FAULT_SIGBUS; 3366 if (substream->ops->page) 3367 page = substream->ops->page(substream, offset); 3368 else 3369 page = snd_pcm_default_page_ops(substream, offset); 3370 if (!page) 3371 return VM_FAULT_SIGBUS; 3372 get_page(page); 3373 vmf->page = page; 3374 return 0; 3375 } 3376 3377 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3378 .open = snd_pcm_mmap_data_open, 3379 .close = snd_pcm_mmap_data_close, 3380 }; 3381 3382 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3383 .open = snd_pcm_mmap_data_open, 3384 .close = snd_pcm_mmap_data_close, 3385 .fault = snd_pcm_mmap_data_fault, 3386 }; 3387 3388 /* 3389 * mmap the DMA buffer on RAM 3390 */ 3391 3392 /** 3393 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3394 * @substream: PCM substream 3395 * @area: VMA 3396 * 3397 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3398 * this function is invoked implicitly. 3399 */ 3400 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3401 struct vm_area_struct *area) 3402 { 3403 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3404 #ifdef CONFIG_GENERIC_ALLOCATOR 3405 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3406 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3407 return remap_pfn_range(area, area->vm_start, 3408 substream->dma_buffer.addr >> PAGE_SHIFT, 3409 area->vm_end - area->vm_start, area->vm_page_prot); 3410 } 3411 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3412 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3413 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3414 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3415 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3416 area, 3417 substream->runtime->dma_area, 3418 substream->runtime->dma_addr, 3419 substream->runtime->dma_bytes); 3420 #endif /* CONFIG_X86 */ 3421 /* mmap with fault handler */ 3422 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3423 return 0; 3424 } 3425 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3426 3427 /* 3428 * mmap the DMA buffer on I/O memory area 3429 */ 3430 #if SNDRV_PCM_INFO_MMAP_IOMEM 3431 /** 3432 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3433 * @substream: PCM substream 3434 * @area: VMA 3435 * 3436 * When your hardware uses the iomapped pages as the hardware buffer and 3437 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3438 * is supposed to work only on limited architectures. 3439 */ 3440 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3441 struct vm_area_struct *area) 3442 { 3443 struct snd_pcm_runtime *runtime = substream->runtime; 3444 3445 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3446 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3447 } 3448 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3449 #endif /* SNDRV_PCM_INFO_MMAP */ 3450 3451 /* 3452 * mmap DMA buffer 3453 */ 3454 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3455 struct vm_area_struct *area) 3456 { 3457 struct snd_pcm_runtime *runtime; 3458 long size; 3459 unsigned long offset; 3460 size_t dma_bytes; 3461 int err; 3462 3463 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3464 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3465 return -EINVAL; 3466 } else { 3467 if (!(area->vm_flags & VM_READ)) 3468 return -EINVAL; 3469 } 3470 runtime = substream->runtime; 3471 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3472 return -EBADFD; 3473 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3474 return -ENXIO; 3475 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3476 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3477 return -EINVAL; 3478 size = area->vm_end - area->vm_start; 3479 offset = area->vm_pgoff << PAGE_SHIFT; 3480 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3481 if ((size_t)size > dma_bytes) 3482 return -EINVAL; 3483 if (offset > dma_bytes - size) 3484 return -EINVAL; 3485 3486 area->vm_ops = &snd_pcm_vm_ops_data; 3487 area->vm_private_data = substream; 3488 if (substream->ops->mmap) 3489 err = substream->ops->mmap(substream, area); 3490 else 3491 err = snd_pcm_lib_default_mmap(substream, area); 3492 if (!err) 3493 atomic_inc(&substream->mmap_count); 3494 return err; 3495 } 3496 EXPORT_SYMBOL(snd_pcm_mmap_data); 3497 3498 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3499 { 3500 struct snd_pcm_file * pcm_file; 3501 struct snd_pcm_substream *substream; 3502 unsigned long offset; 3503 3504 pcm_file = file->private_data; 3505 substream = pcm_file->substream; 3506 if (PCM_RUNTIME_CHECK(substream)) 3507 return -ENXIO; 3508 3509 offset = area->vm_pgoff << PAGE_SHIFT; 3510 switch (offset) { 3511 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3512 if (!pcm_status_mmap_allowed(pcm_file)) 3513 return -ENXIO; 3514 return snd_pcm_mmap_status(substream, file, area); 3515 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3516 if (!pcm_control_mmap_allowed(pcm_file)) 3517 return -ENXIO; 3518 return snd_pcm_mmap_control(substream, file, area); 3519 default: 3520 return snd_pcm_mmap_data(substream, file, area); 3521 } 3522 return 0; 3523 } 3524 3525 static int snd_pcm_fasync(int fd, struct file * file, int on) 3526 { 3527 struct snd_pcm_file * pcm_file; 3528 struct snd_pcm_substream *substream; 3529 struct snd_pcm_runtime *runtime; 3530 3531 pcm_file = file->private_data; 3532 substream = pcm_file->substream; 3533 if (PCM_RUNTIME_CHECK(substream)) 3534 return -ENXIO; 3535 runtime = substream->runtime; 3536 return fasync_helper(fd, file, on, &runtime->fasync); 3537 } 3538 3539 /* 3540 * ioctl32 compat 3541 */ 3542 #ifdef CONFIG_COMPAT 3543 #include "pcm_compat.c" 3544 #else 3545 #define snd_pcm_ioctl_compat NULL 3546 #endif 3547 3548 /* 3549 * To be removed helpers to keep binary compatibility 3550 */ 3551 3552 #ifdef CONFIG_SND_SUPPORT_OLD_API 3553 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3554 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3555 3556 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3557 struct snd_pcm_hw_params_old *oparams) 3558 { 3559 unsigned int i; 3560 3561 memset(params, 0, sizeof(*params)); 3562 params->flags = oparams->flags; 3563 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3564 params->masks[i].bits[0] = oparams->masks[i]; 3565 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3566 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3567 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3568 params->info = oparams->info; 3569 params->msbits = oparams->msbits; 3570 params->rate_num = oparams->rate_num; 3571 params->rate_den = oparams->rate_den; 3572 params->fifo_size = oparams->fifo_size; 3573 } 3574 3575 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3576 struct snd_pcm_hw_params *params) 3577 { 3578 unsigned int i; 3579 3580 memset(oparams, 0, sizeof(*oparams)); 3581 oparams->flags = params->flags; 3582 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3583 oparams->masks[i] = params->masks[i].bits[0]; 3584 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3585 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3586 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3587 oparams->info = params->info; 3588 oparams->msbits = params->msbits; 3589 oparams->rate_num = params->rate_num; 3590 oparams->rate_den = params->rate_den; 3591 oparams->fifo_size = params->fifo_size; 3592 } 3593 3594 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3595 struct snd_pcm_hw_params_old __user * _oparams) 3596 { 3597 struct snd_pcm_hw_params *params; 3598 struct snd_pcm_hw_params_old *oparams = NULL; 3599 int err; 3600 3601 params = kmalloc(sizeof(*params), GFP_KERNEL); 3602 if (!params) 3603 return -ENOMEM; 3604 3605 oparams = memdup_user(_oparams, sizeof(*oparams)); 3606 if (IS_ERR(oparams)) { 3607 err = PTR_ERR(oparams); 3608 goto out; 3609 } 3610 snd_pcm_hw_convert_from_old_params(params, oparams); 3611 err = snd_pcm_hw_refine(substream, params); 3612 if (err < 0) 3613 goto out_old; 3614 3615 err = fixup_unreferenced_params(substream, params); 3616 if (err < 0) 3617 goto out_old; 3618 3619 snd_pcm_hw_convert_to_old_params(oparams, params); 3620 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3621 err = -EFAULT; 3622 out_old: 3623 kfree(oparams); 3624 out: 3625 kfree(params); 3626 return err; 3627 } 3628 3629 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3630 struct snd_pcm_hw_params_old __user * _oparams) 3631 { 3632 struct snd_pcm_hw_params *params; 3633 struct snd_pcm_hw_params_old *oparams = NULL; 3634 int err; 3635 3636 params = kmalloc(sizeof(*params), GFP_KERNEL); 3637 if (!params) 3638 return -ENOMEM; 3639 3640 oparams = memdup_user(_oparams, sizeof(*oparams)); 3641 if (IS_ERR(oparams)) { 3642 err = PTR_ERR(oparams); 3643 goto out; 3644 } 3645 3646 snd_pcm_hw_convert_from_old_params(params, oparams); 3647 err = snd_pcm_hw_params(substream, params); 3648 if (err < 0) 3649 goto out_old; 3650 3651 snd_pcm_hw_convert_to_old_params(oparams, params); 3652 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3653 err = -EFAULT; 3654 out_old: 3655 kfree(oparams); 3656 out: 3657 kfree(params); 3658 return err; 3659 } 3660 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3661 3662 #ifndef CONFIG_MMU 3663 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3664 unsigned long addr, 3665 unsigned long len, 3666 unsigned long pgoff, 3667 unsigned long flags) 3668 { 3669 struct snd_pcm_file *pcm_file = file->private_data; 3670 struct snd_pcm_substream *substream = pcm_file->substream; 3671 struct snd_pcm_runtime *runtime = substream->runtime; 3672 unsigned long offset = pgoff << PAGE_SHIFT; 3673 3674 switch (offset) { 3675 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3676 return (unsigned long)runtime->status; 3677 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3678 return (unsigned long)runtime->control; 3679 default: 3680 return (unsigned long)runtime->dma_area + offset; 3681 } 3682 } 3683 #else 3684 # define snd_pcm_get_unmapped_area NULL 3685 #endif 3686 3687 /* 3688 * Register section 3689 */ 3690 3691 const struct file_operations snd_pcm_f_ops[2] = { 3692 { 3693 .owner = THIS_MODULE, 3694 .write = snd_pcm_write, 3695 .write_iter = snd_pcm_writev, 3696 .open = snd_pcm_playback_open, 3697 .release = snd_pcm_release, 3698 .llseek = no_llseek, 3699 .poll = snd_pcm_poll, 3700 .unlocked_ioctl = snd_pcm_ioctl, 3701 .compat_ioctl = snd_pcm_ioctl_compat, 3702 .mmap = snd_pcm_mmap, 3703 .fasync = snd_pcm_fasync, 3704 .get_unmapped_area = snd_pcm_get_unmapped_area, 3705 }, 3706 { 3707 .owner = THIS_MODULE, 3708 .read = snd_pcm_read, 3709 .read_iter = snd_pcm_readv, 3710 .open = snd_pcm_capture_open, 3711 .release = snd_pcm_release, 3712 .llseek = no_llseek, 3713 .poll = snd_pcm_poll, 3714 .unlocked_ioctl = snd_pcm_ioctl, 3715 .compat_ioctl = snd_pcm_ioctl_compat, 3716 .mmap = snd_pcm_mmap, 3717 .fasync = snd_pcm_fasync, 3718 .get_unmapped_area = snd_pcm_get_unmapped_area, 3719 } 3720 }; 3721