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 /* Writer in rwsem may block readers even during its waiting in queue, 91 * and this may lead to a deadlock when the code path takes read sem 92 * twice (e.g. one in snd_pcm_action_nonatomic() and another in 93 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to 94 * sleep until all the readers are completed without blocking by writer. 95 */ 96 static inline void down_write_nonfifo(struct rw_semaphore *lock) 97 { 98 while (!down_write_trylock(lock)) 99 msleep(1); 100 } 101 102 void snd_pcm_group_init(struct snd_pcm_group *group) 103 { 104 spin_lock_init(&group->lock); 105 mutex_init(&group->mutex); 106 INIT_LIST_HEAD(&group->substreams); 107 refcount_set(&group->refs, 0); 108 } 109 110 /* define group lock helpers */ 111 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \ 112 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \ 113 { \ 114 if (nonatomic) \ 115 mutex_ ## mutex_action(&group->mutex); \ 116 else \ 117 spin_ ## action(&group->lock); \ 118 } 119 120 DEFINE_PCM_GROUP_LOCK(lock, lock); 121 DEFINE_PCM_GROUP_LOCK(unlock, unlock); 122 DEFINE_PCM_GROUP_LOCK(lock_irq, lock); 123 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock); 124 125 #define PCM_LOCK_DEFAULT 0 126 #define PCM_LOCK_IRQ 1 127 #define PCM_LOCK_IRQSAVE 2 128 129 static unsigned long __snd_pcm_stream_lock_mode(struct snd_pcm_substream *substream, 130 unsigned int mode) 131 { 132 unsigned long flags = 0; 133 if (substream->pcm->nonatomic) { 134 mutex_lock(&substream->self_group.mutex); 135 } else { 136 switch (mode) { 137 case PCM_LOCK_DEFAULT: 138 spin_lock(&substream->self_group.lock); 139 break; 140 case PCM_LOCK_IRQ: 141 spin_lock_irq(&substream->self_group.lock); 142 break; 143 case PCM_LOCK_IRQSAVE: 144 spin_lock_irqsave(&substream->self_group.lock, flags); 145 break; 146 } 147 } 148 return flags; 149 } 150 151 static void __snd_pcm_stream_unlock_mode(struct snd_pcm_substream *substream, 152 unsigned int mode, unsigned long flags) 153 { 154 if (substream->pcm->nonatomic) { 155 mutex_unlock(&substream->self_group.mutex); 156 } else { 157 switch (mode) { 158 case PCM_LOCK_DEFAULT: 159 spin_unlock(&substream->self_group.lock); 160 break; 161 case PCM_LOCK_IRQ: 162 spin_unlock_irq(&substream->self_group.lock); 163 break; 164 case PCM_LOCK_IRQSAVE: 165 spin_unlock_irqrestore(&substream->self_group.lock, flags); 166 break; 167 } 168 } 169 } 170 171 /** 172 * snd_pcm_stream_lock - Lock the PCM stream 173 * @substream: PCM substream 174 * 175 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 176 * flag of the given substream. This also takes the global link rw lock 177 * (or rw sem), too, for avoiding the race with linked streams. 178 */ 179 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 180 { 181 __snd_pcm_stream_lock_mode(substream, PCM_LOCK_DEFAULT); 182 } 183 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 184 185 /** 186 * snd_pcm_stream_lock - Unlock the PCM stream 187 * @substream: PCM substream 188 * 189 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 190 */ 191 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 192 { 193 __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_DEFAULT, 0); 194 } 195 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 196 197 /** 198 * snd_pcm_stream_lock_irq - Lock the PCM stream 199 * @substream: PCM substream 200 * 201 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 202 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 203 * as snd_pcm_stream_lock(). 204 */ 205 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 206 { 207 __snd_pcm_stream_lock_mode(substream, PCM_LOCK_IRQ); 208 } 209 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 210 211 /** 212 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 213 * @substream: PCM substream 214 * 215 * This is a counter-part of snd_pcm_stream_lock_irq(). 216 */ 217 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 218 { 219 __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_IRQ, 0); 220 } 221 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 222 223 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 224 { 225 return __snd_pcm_stream_lock_mode(substream, PCM_LOCK_IRQSAVE); 226 } 227 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 228 229 /** 230 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 231 * @substream: PCM substream 232 * @flags: irq flags 233 * 234 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 235 */ 236 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 237 unsigned long flags) 238 { 239 __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_IRQSAVE, flags); 240 } 241 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 242 243 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 244 { 245 struct snd_pcm *pcm = substream->pcm; 246 struct snd_pcm_str *pstr = substream->pstr; 247 248 memset(info, 0, sizeof(*info)); 249 info->card = pcm->card->number; 250 info->device = pcm->device; 251 info->stream = substream->stream; 252 info->subdevice = substream->number; 253 strlcpy(info->id, pcm->id, sizeof(info->id)); 254 strlcpy(info->name, pcm->name, sizeof(info->name)); 255 info->dev_class = pcm->dev_class; 256 info->dev_subclass = pcm->dev_subclass; 257 info->subdevices_count = pstr->substream_count; 258 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 259 strlcpy(info->subname, substream->name, sizeof(info->subname)); 260 261 return 0; 262 } 263 264 int snd_pcm_info_user(struct snd_pcm_substream *substream, 265 struct snd_pcm_info __user * _info) 266 { 267 struct snd_pcm_info *info; 268 int err; 269 270 info = kmalloc(sizeof(*info), GFP_KERNEL); 271 if (! info) 272 return -ENOMEM; 273 err = snd_pcm_info(substream, info); 274 if (err >= 0) { 275 if (copy_to_user(_info, info, sizeof(*info))) 276 err = -EFAULT; 277 } 278 kfree(info); 279 return err; 280 } 281 282 static bool hw_support_mmap(struct snd_pcm_substream *substream) 283 { 284 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 285 return false; 286 /* architecture supports dma_mmap_coherent()? */ 287 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA) 288 if (!substream->ops->mmap && 289 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 290 return false; 291 #endif 292 return true; 293 } 294 295 static int constrain_mask_params(struct snd_pcm_substream *substream, 296 struct snd_pcm_hw_params *params) 297 { 298 struct snd_pcm_hw_constraints *constrs = 299 &substream->runtime->hw_constraints; 300 struct snd_mask *m; 301 unsigned int k; 302 struct snd_mask old_mask; 303 int changed; 304 305 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 306 m = hw_param_mask(params, k); 307 if (snd_mask_empty(m)) 308 return -EINVAL; 309 310 /* This parameter is not requested to change by a caller. */ 311 if (!(params->rmask & (1 << k))) 312 continue; 313 314 if (trace_hw_mask_param_enabled()) 315 old_mask = *m; 316 317 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 318 if (changed < 0) 319 return changed; 320 if (changed == 0) 321 continue; 322 323 /* Set corresponding flag so that the caller gets it. */ 324 trace_hw_mask_param(substream, k, 0, &old_mask, m); 325 params->cmask |= 1 << k; 326 } 327 328 return 0; 329 } 330 331 static int constrain_interval_params(struct snd_pcm_substream *substream, 332 struct snd_pcm_hw_params *params) 333 { 334 struct snd_pcm_hw_constraints *constrs = 335 &substream->runtime->hw_constraints; 336 struct snd_interval *i; 337 unsigned int k; 338 struct snd_interval old_interval; 339 int changed; 340 341 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 342 i = hw_param_interval(params, k); 343 if (snd_interval_empty(i)) 344 return -EINVAL; 345 346 /* This parameter is not requested to change by a caller. */ 347 if (!(params->rmask & (1 << k))) 348 continue; 349 350 if (trace_hw_interval_param_enabled()) 351 old_interval = *i; 352 353 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 354 if (changed < 0) 355 return changed; 356 if (changed == 0) 357 continue; 358 359 /* Set corresponding flag so that the caller gets it. */ 360 trace_hw_interval_param(substream, k, 0, &old_interval, i); 361 params->cmask |= 1 << k; 362 } 363 364 return 0; 365 } 366 367 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 368 struct snd_pcm_hw_params *params) 369 { 370 struct snd_pcm_hw_constraints *constrs = 371 &substream->runtime->hw_constraints; 372 unsigned int k; 373 unsigned int *rstamps; 374 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 375 unsigned int stamp; 376 struct snd_pcm_hw_rule *r; 377 unsigned int d; 378 struct snd_mask old_mask; 379 struct snd_interval old_interval; 380 bool again; 381 int changed, err = 0; 382 383 /* 384 * Each application of rule has own sequence number. 385 * 386 * Each member of 'rstamps' array represents the sequence number of 387 * recent application of corresponding rule. 388 */ 389 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 390 if (!rstamps) 391 return -ENOMEM; 392 393 /* 394 * Each member of 'vstamps' array represents the sequence number of 395 * recent application of rule in which corresponding parameters were 396 * changed. 397 * 398 * In initial state, elements corresponding to parameters requested by 399 * a caller is 1. For unrequested parameters, corresponding members 400 * have 0 so that the parameters are never changed anymore. 401 */ 402 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 403 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 404 405 /* Due to the above design, actual sequence number starts at 2. */ 406 stamp = 2; 407 retry: 408 /* Apply all rules in order. */ 409 again = false; 410 for (k = 0; k < constrs->rules_num; k++) { 411 r = &constrs->rules[k]; 412 413 /* 414 * Check condition bits of this rule. When the rule has 415 * some condition bits, parameter without the bits is 416 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 417 * is an example of the condition bits. 418 */ 419 if (r->cond && !(r->cond & params->flags)) 420 continue; 421 422 /* 423 * The 'deps' array includes maximum three dependencies 424 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 425 * member of this array is a sentinel and should be 426 * negative value. 427 * 428 * This rule should be processed in this time when dependent 429 * parameters were changed at former applications of the other 430 * rules. 431 */ 432 for (d = 0; r->deps[d] >= 0; d++) { 433 if (vstamps[r->deps[d]] > rstamps[k]) 434 break; 435 } 436 if (r->deps[d] < 0) 437 continue; 438 439 if (trace_hw_mask_param_enabled()) { 440 if (hw_is_mask(r->var)) 441 old_mask = *hw_param_mask(params, r->var); 442 } 443 if (trace_hw_interval_param_enabled()) { 444 if (hw_is_interval(r->var)) 445 old_interval = *hw_param_interval(params, r->var); 446 } 447 448 changed = r->func(params, r); 449 if (changed < 0) { 450 err = changed; 451 goto out; 452 } 453 454 /* 455 * When the parameter is changed, notify it to the caller 456 * by corresponding returned bit, then preparing for next 457 * iteration. 458 */ 459 if (changed && r->var >= 0) { 460 if (hw_is_mask(r->var)) { 461 trace_hw_mask_param(substream, r->var, 462 k + 1, &old_mask, 463 hw_param_mask(params, r->var)); 464 } 465 if (hw_is_interval(r->var)) { 466 trace_hw_interval_param(substream, r->var, 467 k + 1, &old_interval, 468 hw_param_interval(params, r->var)); 469 } 470 471 params->cmask |= (1 << r->var); 472 vstamps[r->var] = stamp; 473 again = true; 474 } 475 476 rstamps[k] = stamp++; 477 } 478 479 /* Iterate to evaluate all rules till no parameters are changed. */ 480 if (again) 481 goto retry; 482 483 out: 484 kfree(rstamps); 485 return err; 486 } 487 488 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 489 struct snd_pcm_hw_params *params) 490 { 491 const struct snd_interval *i; 492 const struct snd_mask *m; 493 int err; 494 495 if (!params->msbits) { 496 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 497 if (snd_interval_single(i)) 498 params->msbits = snd_interval_value(i); 499 } 500 501 if (!params->rate_den) { 502 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 503 if (snd_interval_single(i)) { 504 params->rate_num = snd_interval_value(i); 505 params->rate_den = 1; 506 } 507 } 508 509 if (!params->fifo_size) { 510 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 511 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 512 if (snd_mask_single(m) && snd_interval_single(i)) { 513 err = substream->ops->ioctl(substream, 514 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 515 if (err < 0) 516 return err; 517 } 518 } 519 520 if (!params->info) { 521 params->info = substream->runtime->hw.info; 522 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 523 SNDRV_PCM_INFO_DRAIN_TRIGGER); 524 if (!hw_support_mmap(substream)) 525 params->info &= ~(SNDRV_PCM_INFO_MMAP | 526 SNDRV_PCM_INFO_MMAP_VALID); 527 } 528 529 return 0; 530 } 531 532 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 533 struct snd_pcm_hw_params *params) 534 { 535 int err; 536 537 params->info = 0; 538 params->fifo_size = 0; 539 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 540 params->msbits = 0; 541 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 542 params->rate_num = 0; 543 params->rate_den = 0; 544 } 545 546 err = constrain_mask_params(substream, params); 547 if (err < 0) 548 return err; 549 550 err = constrain_interval_params(substream, params); 551 if (err < 0) 552 return err; 553 554 err = constrain_params_by_rules(substream, params); 555 if (err < 0) 556 return err; 557 558 params->rmask = 0; 559 560 return 0; 561 } 562 EXPORT_SYMBOL(snd_pcm_hw_refine); 563 564 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 565 struct snd_pcm_hw_params __user * _params) 566 { 567 struct snd_pcm_hw_params *params; 568 int err; 569 570 params = memdup_user(_params, sizeof(*params)); 571 if (IS_ERR(params)) 572 return PTR_ERR(params); 573 574 err = snd_pcm_hw_refine(substream, params); 575 if (err < 0) 576 goto end; 577 578 err = fixup_unreferenced_params(substream, params); 579 if (err < 0) 580 goto end; 581 582 if (copy_to_user(_params, params, sizeof(*params))) 583 err = -EFAULT; 584 end: 585 kfree(params); 586 return err; 587 } 588 589 static int period_to_usecs(struct snd_pcm_runtime *runtime) 590 { 591 int usecs; 592 593 if (! runtime->rate) 594 return -1; /* invalid */ 595 596 /* take 75% of period time as the deadline */ 597 usecs = (750000 / runtime->rate) * runtime->period_size; 598 usecs += ((750000 % runtime->rate) * runtime->period_size) / 599 runtime->rate; 600 601 return usecs; 602 } 603 604 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 605 { 606 snd_pcm_stream_lock_irq(substream); 607 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 608 substream->runtime->status->state = state; 609 snd_pcm_stream_unlock_irq(substream); 610 } 611 612 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 613 int event) 614 { 615 #ifdef CONFIG_SND_PCM_TIMER 616 if (substream->timer) 617 snd_timer_notify(substream->timer, event, 618 &substream->runtime->trigger_tstamp); 619 #endif 620 } 621 622 /** 623 * snd_pcm_hw_param_choose - choose a configuration defined by @params 624 * @pcm: PCM instance 625 * @params: the hw_params instance 626 * 627 * Choose one configuration from configuration space defined by @params. 628 * The configuration chosen is that obtained fixing in this order: 629 * first access, first format, first subformat, min channels, 630 * min rate, min period time, max buffer size, min tick time 631 * 632 * Return: Zero if successful, or a negative error code on failure. 633 */ 634 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 635 struct snd_pcm_hw_params *params) 636 { 637 static const int vars[] = { 638 SNDRV_PCM_HW_PARAM_ACCESS, 639 SNDRV_PCM_HW_PARAM_FORMAT, 640 SNDRV_PCM_HW_PARAM_SUBFORMAT, 641 SNDRV_PCM_HW_PARAM_CHANNELS, 642 SNDRV_PCM_HW_PARAM_RATE, 643 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 644 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 645 SNDRV_PCM_HW_PARAM_TICK_TIME, 646 -1 647 }; 648 const int *v; 649 struct snd_mask old_mask; 650 struct snd_interval old_interval; 651 int changed; 652 653 for (v = vars; *v != -1; v++) { 654 /* Keep old parameter to trace. */ 655 if (trace_hw_mask_param_enabled()) { 656 if (hw_is_mask(*v)) 657 old_mask = *hw_param_mask(params, *v); 658 } 659 if (trace_hw_interval_param_enabled()) { 660 if (hw_is_interval(*v)) 661 old_interval = *hw_param_interval(params, *v); 662 } 663 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 664 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 665 else 666 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 667 if (changed < 0) 668 return changed; 669 if (changed == 0) 670 continue; 671 672 /* Trace the changed parameter. */ 673 if (hw_is_mask(*v)) { 674 trace_hw_mask_param(pcm, *v, 0, &old_mask, 675 hw_param_mask(params, *v)); 676 } 677 if (hw_is_interval(*v)) { 678 trace_hw_interval_param(pcm, *v, 0, &old_interval, 679 hw_param_interval(params, *v)); 680 } 681 } 682 683 return 0; 684 } 685 686 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 687 struct snd_pcm_hw_params *params) 688 { 689 struct snd_pcm_runtime *runtime; 690 int err, usecs; 691 unsigned int bits; 692 snd_pcm_uframes_t frames; 693 694 if (PCM_RUNTIME_CHECK(substream)) 695 return -ENXIO; 696 runtime = substream->runtime; 697 snd_pcm_stream_lock_irq(substream); 698 switch (runtime->status->state) { 699 case SNDRV_PCM_STATE_OPEN: 700 case SNDRV_PCM_STATE_SETUP: 701 case SNDRV_PCM_STATE_PREPARED: 702 break; 703 default: 704 snd_pcm_stream_unlock_irq(substream); 705 return -EBADFD; 706 } 707 snd_pcm_stream_unlock_irq(substream); 708 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 709 if (!substream->oss.oss) 710 #endif 711 if (atomic_read(&substream->mmap_count)) 712 return -EBADFD; 713 714 params->rmask = ~0U; 715 err = snd_pcm_hw_refine(substream, params); 716 if (err < 0) 717 goto _error; 718 719 err = snd_pcm_hw_params_choose(substream, params); 720 if (err < 0) 721 goto _error; 722 723 err = fixup_unreferenced_params(substream, params); 724 if (err < 0) 725 goto _error; 726 727 if (substream->ops->hw_params != NULL) { 728 err = substream->ops->hw_params(substream, params); 729 if (err < 0) 730 goto _error; 731 } 732 733 runtime->access = params_access(params); 734 runtime->format = params_format(params); 735 runtime->subformat = params_subformat(params); 736 runtime->channels = params_channels(params); 737 runtime->rate = params_rate(params); 738 runtime->period_size = params_period_size(params); 739 runtime->periods = params_periods(params); 740 runtime->buffer_size = params_buffer_size(params); 741 runtime->info = params->info; 742 runtime->rate_num = params->rate_num; 743 runtime->rate_den = params->rate_den; 744 runtime->no_period_wakeup = 745 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 746 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 747 748 bits = snd_pcm_format_physical_width(runtime->format); 749 runtime->sample_bits = bits; 750 bits *= runtime->channels; 751 runtime->frame_bits = bits; 752 frames = 1; 753 while (bits % 8 != 0) { 754 bits *= 2; 755 frames *= 2; 756 } 757 runtime->byte_align = bits / 8; 758 runtime->min_align = frames; 759 760 /* Default sw params */ 761 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 762 runtime->period_step = 1; 763 runtime->control->avail_min = runtime->period_size; 764 runtime->start_threshold = 1; 765 runtime->stop_threshold = runtime->buffer_size; 766 runtime->silence_threshold = 0; 767 runtime->silence_size = 0; 768 runtime->boundary = runtime->buffer_size; 769 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 770 runtime->boundary *= 2; 771 772 snd_pcm_timer_resolution_change(substream); 773 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 774 775 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 776 pm_qos_remove_request(&substream->latency_pm_qos_req); 777 if ((usecs = period_to_usecs(runtime)) >= 0) 778 pm_qos_add_request(&substream->latency_pm_qos_req, 779 PM_QOS_CPU_DMA_LATENCY, usecs); 780 return 0; 781 _error: 782 /* hardware might be unusable from this time, 783 so we force application to retry to set 784 the correct hardware parameter settings */ 785 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 786 if (substream->ops->hw_free != NULL) 787 substream->ops->hw_free(substream); 788 return err; 789 } 790 791 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 792 struct snd_pcm_hw_params __user * _params) 793 { 794 struct snd_pcm_hw_params *params; 795 int err; 796 797 params = memdup_user(_params, sizeof(*params)); 798 if (IS_ERR(params)) 799 return PTR_ERR(params); 800 801 err = snd_pcm_hw_params(substream, params); 802 if (err < 0) 803 goto end; 804 805 if (copy_to_user(_params, params, sizeof(*params))) 806 err = -EFAULT; 807 end: 808 kfree(params); 809 return err; 810 } 811 812 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 813 { 814 struct snd_pcm_runtime *runtime; 815 int result = 0; 816 817 if (PCM_RUNTIME_CHECK(substream)) 818 return -ENXIO; 819 runtime = substream->runtime; 820 snd_pcm_stream_lock_irq(substream); 821 switch (runtime->status->state) { 822 case SNDRV_PCM_STATE_SETUP: 823 case SNDRV_PCM_STATE_PREPARED: 824 break; 825 default: 826 snd_pcm_stream_unlock_irq(substream); 827 return -EBADFD; 828 } 829 snd_pcm_stream_unlock_irq(substream); 830 if (atomic_read(&substream->mmap_count)) 831 return -EBADFD; 832 if (substream->ops->hw_free) 833 result = substream->ops->hw_free(substream); 834 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 835 pm_qos_remove_request(&substream->latency_pm_qos_req); 836 return result; 837 } 838 839 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 840 struct snd_pcm_sw_params *params) 841 { 842 struct snd_pcm_runtime *runtime; 843 int err; 844 845 if (PCM_RUNTIME_CHECK(substream)) 846 return -ENXIO; 847 runtime = substream->runtime; 848 snd_pcm_stream_lock_irq(substream); 849 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 850 snd_pcm_stream_unlock_irq(substream); 851 return -EBADFD; 852 } 853 snd_pcm_stream_unlock_irq(substream); 854 855 if (params->tstamp_mode < 0 || 856 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 857 return -EINVAL; 858 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 859 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 860 return -EINVAL; 861 if (params->avail_min == 0) 862 return -EINVAL; 863 if (params->silence_size >= runtime->boundary) { 864 if (params->silence_threshold != 0) 865 return -EINVAL; 866 } else { 867 if (params->silence_size > params->silence_threshold) 868 return -EINVAL; 869 if (params->silence_threshold > runtime->buffer_size) 870 return -EINVAL; 871 } 872 err = 0; 873 snd_pcm_stream_lock_irq(substream); 874 runtime->tstamp_mode = params->tstamp_mode; 875 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 876 runtime->tstamp_type = params->tstamp_type; 877 runtime->period_step = params->period_step; 878 runtime->control->avail_min = params->avail_min; 879 runtime->start_threshold = params->start_threshold; 880 runtime->stop_threshold = params->stop_threshold; 881 runtime->silence_threshold = params->silence_threshold; 882 runtime->silence_size = params->silence_size; 883 params->boundary = runtime->boundary; 884 if (snd_pcm_running(substream)) { 885 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 886 runtime->silence_size > 0) 887 snd_pcm_playback_silence(substream, ULONG_MAX); 888 err = snd_pcm_update_state(substream, runtime); 889 } 890 snd_pcm_stream_unlock_irq(substream); 891 return err; 892 } 893 894 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 895 struct snd_pcm_sw_params __user * _params) 896 { 897 struct snd_pcm_sw_params params; 898 int err; 899 if (copy_from_user(¶ms, _params, sizeof(params))) 900 return -EFAULT; 901 err = snd_pcm_sw_params(substream, ¶ms); 902 if (copy_to_user(_params, ¶ms, sizeof(params))) 903 return -EFAULT; 904 return err; 905 } 906 907 static inline snd_pcm_uframes_t 908 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 909 { 910 snd_pcm_uframes_t delay; 911 912 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 913 delay = snd_pcm_playback_hw_avail(substream->runtime); 914 else 915 delay = snd_pcm_capture_avail(substream->runtime); 916 return delay + substream->runtime->delay; 917 } 918 919 int snd_pcm_status(struct snd_pcm_substream *substream, 920 struct snd_pcm_status *status) 921 { 922 struct snd_pcm_runtime *runtime = substream->runtime; 923 924 snd_pcm_stream_lock_irq(substream); 925 926 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 927 &runtime->audio_tstamp_config); 928 929 /* backwards compatible behavior */ 930 if (runtime->audio_tstamp_config.type_requested == 931 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 932 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 933 runtime->audio_tstamp_config.type_requested = 934 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 935 else 936 runtime->audio_tstamp_config.type_requested = 937 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 938 runtime->audio_tstamp_report.valid = 0; 939 } else 940 runtime->audio_tstamp_report.valid = 1; 941 942 status->state = runtime->status->state; 943 status->suspended_state = runtime->status->suspended_state; 944 if (status->state == SNDRV_PCM_STATE_OPEN) 945 goto _end; 946 status->trigger_tstamp = runtime->trigger_tstamp; 947 if (snd_pcm_running(substream)) { 948 snd_pcm_update_hw_ptr(substream); 949 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 950 status->tstamp = runtime->status->tstamp; 951 status->driver_tstamp = runtime->driver_tstamp; 952 status->audio_tstamp = 953 runtime->status->audio_tstamp; 954 if (runtime->audio_tstamp_report.valid == 1) 955 /* backwards compatibility, no report provided in COMPAT mode */ 956 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 957 &status->audio_tstamp_accuracy, 958 &runtime->audio_tstamp_report); 959 960 goto _tstamp_end; 961 } 962 } else { 963 /* get tstamp only in fallback mode and only if enabled */ 964 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 965 snd_pcm_gettime(runtime, &status->tstamp); 966 } 967 _tstamp_end: 968 status->appl_ptr = runtime->control->appl_ptr; 969 status->hw_ptr = runtime->status->hw_ptr; 970 status->avail = snd_pcm_avail(substream); 971 status->delay = snd_pcm_running(substream) ? 972 snd_pcm_calc_delay(substream) : 0; 973 status->avail_max = runtime->avail_max; 974 status->overrange = runtime->overrange; 975 runtime->avail_max = 0; 976 runtime->overrange = 0; 977 _end: 978 snd_pcm_stream_unlock_irq(substream); 979 return 0; 980 } 981 982 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 983 struct snd_pcm_status __user * _status, 984 bool ext) 985 { 986 struct snd_pcm_status status; 987 int res; 988 989 memset(&status, 0, sizeof(status)); 990 /* 991 * with extension, parameters are read/write, 992 * get audio_tstamp_data from user, 993 * ignore rest of status structure 994 */ 995 if (ext && get_user(status.audio_tstamp_data, 996 (u32 __user *)(&_status->audio_tstamp_data))) 997 return -EFAULT; 998 res = snd_pcm_status(substream, &status); 999 if (res < 0) 1000 return res; 1001 if (copy_to_user(_status, &status, sizeof(status))) 1002 return -EFAULT; 1003 return 0; 1004 } 1005 1006 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 1007 struct snd_pcm_channel_info * info) 1008 { 1009 struct snd_pcm_runtime *runtime; 1010 unsigned int channel; 1011 1012 channel = info->channel; 1013 runtime = substream->runtime; 1014 snd_pcm_stream_lock_irq(substream); 1015 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 1016 snd_pcm_stream_unlock_irq(substream); 1017 return -EBADFD; 1018 } 1019 snd_pcm_stream_unlock_irq(substream); 1020 if (channel >= runtime->channels) 1021 return -EINVAL; 1022 memset(info, 0, sizeof(*info)); 1023 info->channel = channel; 1024 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 1025 } 1026 1027 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 1028 struct snd_pcm_channel_info __user * _info) 1029 { 1030 struct snd_pcm_channel_info info; 1031 int res; 1032 1033 if (copy_from_user(&info, _info, sizeof(info))) 1034 return -EFAULT; 1035 res = snd_pcm_channel_info(substream, &info); 1036 if (res < 0) 1037 return res; 1038 if (copy_to_user(_info, &info, sizeof(info))) 1039 return -EFAULT; 1040 return 0; 1041 } 1042 1043 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 1044 { 1045 struct snd_pcm_runtime *runtime = substream->runtime; 1046 if (runtime->trigger_master == NULL) 1047 return; 1048 if (runtime->trigger_master == substream) { 1049 if (!runtime->trigger_tstamp_latched) 1050 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1051 } else { 1052 snd_pcm_trigger_tstamp(runtime->trigger_master); 1053 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1054 } 1055 runtime->trigger_master = NULL; 1056 } 1057 1058 struct action_ops { 1059 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1060 int (*do_action)(struct snd_pcm_substream *substream, int state); 1061 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1062 void (*post_action)(struct snd_pcm_substream *substream, int state); 1063 }; 1064 1065 /* 1066 * this functions is core for handling of linked stream 1067 * Note: the stream state might be changed also on failure 1068 * Note2: call with calling stream lock + link lock 1069 */ 1070 static int snd_pcm_action_group(const struct action_ops *ops, 1071 struct snd_pcm_substream *substream, 1072 int state, int do_lock) 1073 { 1074 struct snd_pcm_substream *s = NULL; 1075 struct snd_pcm_substream *s1; 1076 int res = 0, depth = 1; 1077 1078 snd_pcm_group_for_each_entry(s, substream) { 1079 if (do_lock && s != substream) { 1080 if (s->pcm->nonatomic) 1081 mutex_lock_nested(&s->self_group.mutex, depth); 1082 else 1083 spin_lock_nested(&s->self_group.lock, depth); 1084 depth++; 1085 } 1086 res = ops->pre_action(s, state); 1087 if (res < 0) 1088 goto _unlock; 1089 } 1090 snd_pcm_group_for_each_entry(s, substream) { 1091 res = ops->do_action(s, state); 1092 if (res < 0) { 1093 if (ops->undo_action) { 1094 snd_pcm_group_for_each_entry(s1, substream) { 1095 if (s1 == s) /* failed stream */ 1096 break; 1097 ops->undo_action(s1, state); 1098 } 1099 } 1100 s = NULL; /* unlock all */ 1101 goto _unlock; 1102 } 1103 } 1104 snd_pcm_group_for_each_entry(s, substream) { 1105 ops->post_action(s, state); 1106 } 1107 _unlock: 1108 if (do_lock) { 1109 /* unlock streams */ 1110 snd_pcm_group_for_each_entry(s1, substream) { 1111 if (s1 != substream) { 1112 if (s1->pcm->nonatomic) 1113 mutex_unlock(&s1->self_group.mutex); 1114 else 1115 spin_unlock(&s1->self_group.lock); 1116 } 1117 if (s1 == s) /* end */ 1118 break; 1119 } 1120 } 1121 return res; 1122 } 1123 1124 /* 1125 * Note: call with stream lock 1126 */ 1127 static int snd_pcm_action_single(const struct action_ops *ops, 1128 struct snd_pcm_substream *substream, 1129 int state) 1130 { 1131 int res; 1132 1133 res = ops->pre_action(substream, state); 1134 if (res < 0) 1135 return res; 1136 res = ops->do_action(substream, state); 1137 if (res == 0) 1138 ops->post_action(substream, state); 1139 else if (ops->undo_action) 1140 ops->undo_action(substream, state); 1141 return res; 1142 } 1143 1144 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1145 struct snd_pcm_group *new_group) 1146 { 1147 substream->group = new_group; 1148 list_move(&substream->link_list, &new_group->substreams); 1149 } 1150 1151 /* 1152 * Unref and unlock the group, but keep the stream lock; 1153 * when the group becomes empty and no longer referred, destroy itself 1154 */ 1155 static void snd_pcm_group_unref(struct snd_pcm_group *group, 1156 struct snd_pcm_substream *substream) 1157 { 1158 bool do_free; 1159 1160 if (!group) 1161 return; 1162 do_free = refcount_dec_and_test(&group->refs) && 1163 list_empty(&group->substreams); 1164 snd_pcm_group_unlock(group, substream->pcm->nonatomic); 1165 if (do_free) 1166 kfree(group); 1167 } 1168 1169 /* 1170 * Lock the group inside a stream lock and reference it; 1171 * return the locked group object, or NULL if not linked 1172 */ 1173 static struct snd_pcm_group * 1174 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) 1175 { 1176 bool nonatomic = substream->pcm->nonatomic; 1177 struct snd_pcm_group *group; 1178 bool trylock; 1179 1180 for (;;) { 1181 if (!snd_pcm_stream_linked(substream)) 1182 return NULL; 1183 group = substream->group; 1184 /* block freeing the group object */ 1185 refcount_inc(&group->refs); 1186 1187 trylock = nonatomic ? mutex_trylock(&group->mutex) : 1188 spin_trylock(&group->lock); 1189 if (trylock) 1190 break; /* OK */ 1191 1192 /* re-lock for avoiding ABBA deadlock */ 1193 snd_pcm_stream_unlock(substream); 1194 snd_pcm_group_lock(group, nonatomic); 1195 snd_pcm_stream_lock(substream); 1196 1197 /* check the group again; the above opens a small race window */ 1198 if (substream->group == group) 1199 break; /* OK */ 1200 /* group changed, try again */ 1201 snd_pcm_group_unref(group, substream); 1202 } 1203 return group; 1204 } 1205 1206 /* 1207 * Note: call with stream lock 1208 */ 1209 static int snd_pcm_action(const struct action_ops *ops, 1210 struct snd_pcm_substream *substream, 1211 int state) 1212 { 1213 struct snd_pcm_group *group; 1214 int res; 1215 1216 group = snd_pcm_stream_group_ref(substream); 1217 if (group) 1218 res = snd_pcm_action_group(ops, substream, state, 1); 1219 else 1220 res = snd_pcm_action_single(ops, substream, state); 1221 snd_pcm_group_unref(group, substream); 1222 return res; 1223 } 1224 1225 /* 1226 * Note: don't use any locks before 1227 */ 1228 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1229 struct snd_pcm_substream *substream, 1230 int state) 1231 { 1232 int res; 1233 1234 snd_pcm_stream_lock_irq(substream); 1235 res = snd_pcm_action(ops, substream, state); 1236 snd_pcm_stream_unlock_irq(substream); 1237 return res; 1238 } 1239 1240 /* 1241 */ 1242 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1243 struct snd_pcm_substream *substream, 1244 int state) 1245 { 1246 int res; 1247 1248 /* Guarantee the group members won't change during non-atomic action */ 1249 down_read(&snd_pcm_link_rwsem); 1250 if (snd_pcm_stream_linked(substream)) 1251 res = snd_pcm_action_group(ops, substream, state, 0); 1252 else 1253 res = snd_pcm_action_single(ops, substream, state); 1254 up_read(&snd_pcm_link_rwsem); 1255 return res; 1256 } 1257 1258 /* 1259 * start callbacks 1260 */ 1261 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1262 { 1263 struct snd_pcm_runtime *runtime = substream->runtime; 1264 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1265 return -EBADFD; 1266 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1267 !snd_pcm_playback_data(substream)) 1268 return -EPIPE; 1269 runtime->trigger_tstamp_latched = false; 1270 runtime->trigger_master = substream; 1271 return 0; 1272 } 1273 1274 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1275 { 1276 if (substream->runtime->trigger_master != substream) 1277 return 0; 1278 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1279 } 1280 1281 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1282 { 1283 if (substream->runtime->trigger_master == substream) 1284 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1285 } 1286 1287 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1288 { 1289 struct snd_pcm_runtime *runtime = substream->runtime; 1290 snd_pcm_trigger_tstamp(substream); 1291 runtime->hw_ptr_jiffies = jiffies; 1292 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1293 runtime->rate; 1294 runtime->status->state = state; 1295 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1296 runtime->silence_size > 0) 1297 snd_pcm_playback_silence(substream, ULONG_MAX); 1298 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1299 } 1300 1301 static const struct action_ops snd_pcm_action_start = { 1302 .pre_action = snd_pcm_pre_start, 1303 .do_action = snd_pcm_do_start, 1304 .undo_action = snd_pcm_undo_start, 1305 .post_action = snd_pcm_post_start 1306 }; 1307 1308 /** 1309 * snd_pcm_start - start all linked streams 1310 * @substream: the PCM substream instance 1311 * 1312 * Return: Zero if successful, or a negative error code. 1313 * The stream lock must be acquired before calling this function. 1314 */ 1315 int snd_pcm_start(struct snd_pcm_substream *substream) 1316 { 1317 return snd_pcm_action(&snd_pcm_action_start, substream, 1318 SNDRV_PCM_STATE_RUNNING); 1319 } 1320 1321 /* take the stream lock and start the streams */ 1322 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1323 { 1324 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1325 SNDRV_PCM_STATE_RUNNING); 1326 } 1327 1328 /* 1329 * stop callbacks 1330 */ 1331 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1332 { 1333 struct snd_pcm_runtime *runtime = substream->runtime; 1334 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1335 return -EBADFD; 1336 runtime->trigger_master = substream; 1337 return 0; 1338 } 1339 1340 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1341 { 1342 if (substream->runtime->trigger_master == substream && 1343 snd_pcm_running(substream)) 1344 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1345 return 0; /* unconditonally stop all substreams */ 1346 } 1347 1348 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1349 { 1350 struct snd_pcm_runtime *runtime = substream->runtime; 1351 if (runtime->status->state != state) { 1352 snd_pcm_trigger_tstamp(substream); 1353 runtime->status->state = state; 1354 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1355 } 1356 wake_up(&runtime->sleep); 1357 wake_up(&runtime->tsleep); 1358 } 1359 1360 static const struct action_ops snd_pcm_action_stop = { 1361 .pre_action = snd_pcm_pre_stop, 1362 .do_action = snd_pcm_do_stop, 1363 .post_action = snd_pcm_post_stop 1364 }; 1365 1366 /** 1367 * snd_pcm_stop - try to stop all running streams in the substream group 1368 * @substream: the PCM substream instance 1369 * @state: PCM state after stopping the stream 1370 * 1371 * The state of each stream is then changed to the given state unconditionally. 1372 * 1373 * Return: Zero if successful, or a negative error code. 1374 */ 1375 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1376 { 1377 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1378 } 1379 EXPORT_SYMBOL(snd_pcm_stop); 1380 1381 /** 1382 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1383 * @substream: the PCM substream 1384 * 1385 * After stopping, the state is changed to SETUP. 1386 * Unlike snd_pcm_stop(), this affects only the given stream. 1387 * 1388 * Return: Zero if succesful, or a negative error code. 1389 */ 1390 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1391 { 1392 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1393 SNDRV_PCM_STATE_SETUP); 1394 } 1395 1396 /** 1397 * snd_pcm_stop_xrun - stop the running streams as XRUN 1398 * @substream: the PCM substream instance 1399 * 1400 * This stops the given running substream (and all linked substreams) as XRUN. 1401 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1402 * 1403 * Return: Zero if successful, or a negative error code. 1404 */ 1405 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1406 { 1407 unsigned long flags; 1408 1409 snd_pcm_stream_lock_irqsave(substream, flags); 1410 if (substream->runtime && snd_pcm_running(substream)) 1411 __snd_pcm_xrun(substream); 1412 snd_pcm_stream_unlock_irqrestore(substream, flags); 1413 return 0; 1414 } 1415 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1416 1417 /* 1418 * pause callbacks 1419 */ 1420 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1421 { 1422 struct snd_pcm_runtime *runtime = substream->runtime; 1423 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1424 return -ENOSYS; 1425 if (push) { 1426 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1427 return -EBADFD; 1428 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1429 return -EBADFD; 1430 runtime->trigger_master = substream; 1431 return 0; 1432 } 1433 1434 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1435 { 1436 if (substream->runtime->trigger_master != substream) 1437 return 0; 1438 /* some drivers might use hw_ptr to recover from the pause - 1439 update the hw_ptr now */ 1440 if (push) 1441 snd_pcm_update_hw_ptr(substream); 1442 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1443 * a delta between the current jiffies, this gives a large enough 1444 * delta, effectively to skip the check once. 1445 */ 1446 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1447 return substream->ops->trigger(substream, 1448 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1449 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1450 } 1451 1452 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1453 { 1454 if (substream->runtime->trigger_master == substream) 1455 substream->ops->trigger(substream, 1456 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1457 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1458 } 1459 1460 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1461 { 1462 struct snd_pcm_runtime *runtime = substream->runtime; 1463 snd_pcm_trigger_tstamp(substream); 1464 if (push) { 1465 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1466 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1467 wake_up(&runtime->sleep); 1468 wake_up(&runtime->tsleep); 1469 } else { 1470 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1471 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1472 } 1473 } 1474 1475 static const struct action_ops snd_pcm_action_pause = { 1476 .pre_action = snd_pcm_pre_pause, 1477 .do_action = snd_pcm_do_pause, 1478 .undo_action = snd_pcm_undo_pause, 1479 .post_action = snd_pcm_post_pause 1480 }; 1481 1482 /* 1483 * Push/release the pause for all linked streams. 1484 */ 1485 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1486 { 1487 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1488 } 1489 1490 #ifdef CONFIG_PM 1491 /* suspend */ 1492 1493 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1494 { 1495 struct snd_pcm_runtime *runtime = substream->runtime; 1496 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1497 return -EBUSY; 1498 runtime->trigger_master = substream; 1499 return 0; 1500 } 1501 1502 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1503 { 1504 struct snd_pcm_runtime *runtime = substream->runtime; 1505 if (runtime->trigger_master != substream) 1506 return 0; 1507 if (! snd_pcm_running(substream)) 1508 return 0; 1509 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1510 return 0; /* suspend unconditionally */ 1511 } 1512 1513 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1514 { 1515 struct snd_pcm_runtime *runtime = substream->runtime; 1516 snd_pcm_trigger_tstamp(substream); 1517 runtime->status->suspended_state = runtime->status->state; 1518 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1519 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1520 wake_up(&runtime->sleep); 1521 wake_up(&runtime->tsleep); 1522 } 1523 1524 static const struct action_ops snd_pcm_action_suspend = { 1525 .pre_action = snd_pcm_pre_suspend, 1526 .do_action = snd_pcm_do_suspend, 1527 .post_action = snd_pcm_post_suspend 1528 }; 1529 1530 /** 1531 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1532 * @substream: the PCM substream 1533 * 1534 * After this call, all streams are changed to SUSPENDED state. 1535 * 1536 * Return: Zero if successful (or @substream is %NULL), or a negative error 1537 * code. 1538 */ 1539 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1540 { 1541 int err; 1542 unsigned long flags; 1543 1544 if (! substream) 1545 return 0; 1546 1547 snd_pcm_stream_lock_irqsave(substream, flags); 1548 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1549 snd_pcm_stream_unlock_irqrestore(substream, flags); 1550 return err; 1551 } 1552 EXPORT_SYMBOL(snd_pcm_suspend); 1553 1554 /** 1555 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1556 * @pcm: the PCM instance 1557 * 1558 * After this call, all streams are changed to SUSPENDED state. 1559 * 1560 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1561 */ 1562 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1563 { 1564 struct snd_pcm_substream *substream; 1565 int stream, err = 0; 1566 1567 if (! pcm) 1568 return 0; 1569 1570 for (stream = 0; stream < 2; stream++) { 1571 for (substream = pcm->streams[stream].substream; 1572 substream; substream = substream->next) { 1573 /* FIXME: the open/close code should lock this as well */ 1574 if (substream->runtime == NULL) 1575 continue; 1576 err = snd_pcm_suspend(substream); 1577 if (err < 0 && err != -EBUSY) 1578 return err; 1579 } 1580 } 1581 return 0; 1582 } 1583 EXPORT_SYMBOL(snd_pcm_suspend_all); 1584 1585 /* resume */ 1586 1587 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1588 { 1589 struct snd_pcm_runtime *runtime = substream->runtime; 1590 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1591 return -ENOSYS; 1592 runtime->trigger_master = substream; 1593 return 0; 1594 } 1595 1596 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1597 { 1598 struct snd_pcm_runtime *runtime = substream->runtime; 1599 if (runtime->trigger_master != substream) 1600 return 0; 1601 /* DMA not running previously? */ 1602 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1603 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1604 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1605 return 0; 1606 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1607 } 1608 1609 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1610 { 1611 if (substream->runtime->trigger_master == substream && 1612 snd_pcm_running(substream)) 1613 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1614 } 1615 1616 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1617 { 1618 struct snd_pcm_runtime *runtime = substream->runtime; 1619 snd_pcm_trigger_tstamp(substream); 1620 runtime->status->state = runtime->status->suspended_state; 1621 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1622 } 1623 1624 static const struct action_ops snd_pcm_action_resume = { 1625 .pre_action = snd_pcm_pre_resume, 1626 .do_action = snd_pcm_do_resume, 1627 .undo_action = snd_pcm_undo_resume, 1628 .post_action = snd_pcm_post_resume 1629 }; 1630 1631 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1632 { 1633 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1634 } 1635 1636 #else 1637 1638 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1639 { 1640 return -ENOSYS; 1641 } 1642 1643 #endif /* CONFIG_PM */ 1644 1645 /* 1646 * xrun ioctl 1647 * 1648 * Change the RUNNING stream(s) to XRUN state. 1649 */ 1650 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1651 { 1652 struct snd_pcm_runtime *runtime = substream->runtime; 1653 int result; 1654 1655 snd_pcm_stream_lock_irq(substream); 1656 switch (runtime->status->state) { 1657 case SNDRV_PCM_STATE_XRUN: 1658 result = 0; /* already there */ 1659 break; 1660 case SNDRV_PCM_STATE_RUNNING: 1661 __snd_pcm_xrun(substream); 1662 result = 0; 1663 break; 1664 default: 1665 result = -EBADFD; 1666 } 1667 snd_pcm_stream_unlock_irq(substream); 1668 return result; 1669 } 1670 1671 /* 1672 * reset ioctl 1673 */ 1674 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1675 { 1676 struct snd_pcm_runtime *runtime = substream->runtime; 1677 switch (runtime->status->state) { 1678 case SNDRV_PCM_STATE_RUNNING: 1679 case SNDRV_PCM_STATE_PREPARED: 1680 case SNDRV_PCM_STATE_PAUSED: 1681 case SNDRV_PCM_STATE_SUSPENDED: 1682 return 0; 1683 default: 1684 return -EBADFD; 1685 } 1686 } 1687 1688 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1689 { 1690 struct snd_pcm_runtime *runtime = substream->runtime; 1691 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1692 if (err < 0) 1693 return err; 1694 runtime->hw_ptr_base = 0; 1695 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1696 runtime->status->hw_ptr % runtime->period_size; 1697 runtime->silence_start = runtime->status->hw_ptr; 1698 runtime->silence_filled = 0; 1699 return 0; 1700 } 1701 1702 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1703 { 1704 struct snd_pcm_runtime *runtime = substream->runtime; 1705 runtime->control->appl_ptr = runtime->status->hw_ptr; 1706 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1707 runtime->silence_size > 0) 1708 snd_pcm_playback_silence(substream, ULONG_MAX); 1709 } 1710 1711 static const struct action_ops snd_pcm_action_reset = { 1712 .pre_action = snd_pcm_pre_reset, 1713 .do_action = snd_pcm_do_reset, 1714 .post_action = snd_pcm_post_reset 1715 }; 1716 1717 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1718 { 1719 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1720 } 1721 1722 /* 1723 * prepare ioctl 1724 */ 1725 /* we use the second argument for updating f_flags */ 1726 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1727 int f_flags) 1728 { 1729 struct snd_pcm_runtime *runtime = substream->runtime; 1730 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1731 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1732 return -EBADFD; 1733 if (snd_pcm_running(substream)) 1734 return -EBUSY; 1735 substream->f_flags = f_flags; 1736 return 0; 1737 } 1738 1739 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1740 { 1741 int err; 1742 err = substream->ops->prepare(substream); 1743 if (err < 0) 1744 return err; 1745 return snd_pcm_do_reset(substream, 0); 1746 } 1747 1748 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1749 { 1750 struct snd_pcm_runtime *runtime = substream->runtime; 1751 runtime->control->appl_ptr = runtime->status->hw_ptr; 1752 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1753 } 1754 1755 static const struct action_ops snd_pcm_action_prepare = { 1756 .pre_action = snd_pcm_pre_prepare, 1757 .do_action = snd_pcm_do_prepare, 1758 .post_action = snd_pcm_post_prepare 1759 }; 1760 1761 /** 1762 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1763 * @substream: the PCM substream instance 1764 * @file: file to refer f_flags 1765 * 1766 * Return: Zero if successful, or a negative error code. 1767 */ 1768 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1769 struct file *file) 1770 { 1771 int f_flags; 1772 1773 if (file) 1774 f_flags = file->f_flags; 1775 else 1776 f_flags = substream->f_flags; 1777 1778 snd_pcm_stream_lock_irq(substream); 1779 switch (substream->runtime->status->state) { 1780 case SNDRV_PCM_STATE_PAUSED: 1781 snd_pcm_pause(substream, 0); 1782 /* fallthru */ 1783 case SNDRV_PCM_STATE_SUSPENDED: 1784 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1785 break; 1786 } 1787 snd_pcm_stream_unlock_irq(substream); 1788 1789 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1790 substream, f_flags); 1791 } 1792 1793 /* 1794 * drain ioctl 1795 */ 1796 1797 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1798 { 1799 struct snd_pcm_runtime *runtime = substream->runtime; 1800 switch (runtime->status->state) { 1801 case SNDRV_PCM_STATE_OPEN: 1802 case SNDRV_PCM_STATE_DISCONNECTED: 1803 case SNDRV_PCM_STATE_SUSPENDED: 1804 return -EBADFD; 1805 } 1806 runtime->trigger_master = substream; 1807 return 0; 1808 } 1809 1810 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1811 { 1812 struct snd_pcm_runtime *runtime = substream->runtime; 1813 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1814 switch (runtime->status->state) { 1815 case SNDRV_PCM_STATE_PREPARED: 1816 /* start playback stream if possible */ 1817 if (! snd_pcm_playback_empty(substream)) { 1818 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1819 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1820 } else { 1821 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1822 } 1823 break; 1824 case SNDRV_PCM_STATE_RUNNING: 1825 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1826 break; 1827 case SNDRV_PCM_STATE_XRUN: 1828 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1829 break; 1830 default: 1831 break; 1832 } 1833 } else { 1834 /* stop running stream */ 1835 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1836 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1837 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1838 snd_pcm_do_stop(substream, new_state); 1839 snd_pcm_post_stop(substream, new_state); 1840 } 1841 } 1842 1843 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1844 runtime->trigger_master == substream && 1845 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1846 return substream->ops->trigger(substream, 1847 SNDRV_PCM_TRIGGER_DRAIN); 1848 1849 return 0; 1850 } 1851 1852 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1853 { 1854 } 1855 1856 static const struct action_ops snd_pcm_action_drain_init = { 1857 .pre_action = snd_pcm_pre_drain_init, 1858 .do_action = snd_pcm_do_drain_init, 1859 .post_action = snd_pcm_post_drain_init 1860 }; 1861 1862 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1863 1864 /* 1865 * Drain the stream(s). 1866 * When the substream is linked, sync until the draining of all playback streams 1867 * is finished. 1868 * After this call, all streams are supposed to be either SETUP or DRAINING 1869 * (capture only) state. 1870 */ 1871 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1872 struct file *file) 1873 { 1874 struct snd_card *card; 1875 struct snd_pcm_runtime *runtime; 1876 struct snd_pcm_substream *s; 1877 struct snd_pcm_group *group; 1878 wait_queue_entry_t wait; 1879 int result = 0; 1880 int nonblock = 0; 1881 1882 card = substream->pcm->card; 1883 runtime = substream->runtime; 1884 1885 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1886 return -EBADFD; 1887 1888 if (file) { 1889 if (file->f_flags & O_NONBLOCK) 1890 nonblock = 1; 1891 } else if (substream->f_flags & O_NONBLOCK) 1892 nonblock = 1; 1893 1894 snd_pcm_stream_lock_irq(substream); 1895 /* resume pause */ 1896 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1897 snd_pcm_pause(substream, 0); 1898 1899 /* pre-start/stop - all running streams are changed to DRAINING state */ 1900 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1901 if (result < 0) 1902 goto unlock; 1903 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1904 if (nonblock) { 1905 result = -EAGAIN; 1906 goto unlock; 1907 } 1908 1909 for (;;) { 1910 long tout; 1911 struct snd_pcm_runtime *to_check; 1912 if (signal_pending(current)) { 1913 result = -ERESTARTSYS; 1914 break; 1915 } 1916 /* find a substream to drain */ 1917 to_check = NULL; 1918 group = snd_pcm_stream_group_ref(substream); 1919 snd_pcm_group_for_each_entry(s, substream) { 1920 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1921 continue; 1922 runtime = s->runtime; 1923 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1924 to_check = runtime; 1925 break; 1926 } 1927 } 1928 snd_pcm_group_unref(group, substream); 1929 if (!to_check) 1930 break; /* all drained */ 1931 init_waitqueue_entry(&wait, current); 1932 add_wait_queue(&to_check->sleep, &wait); 1933 snd_pcm_stream_unlock_irq(substream); 1934 if (runtime->no_period_wakeup) 1935 tout = MAX_SCHEDULE_TIMEOUT; 1936 else { 1937 tout = 10; 1938 if (runtime->rate) { 1939 long t = runtime->period_size * 2 / runtime->rate; 1940 tout = max(t, tout); 1941 } 1942 tout = msecs_to_jiffies(tout * 1000); 1943 } 1944 tout = schedule_timeout_interruptible(tout); 1945 1946 snd_pcm_stream_lock_irq(substream); 1947 group = snd_pcm_stream_group_ref(substream); 1948 snd_pcm_group_for_each_entry(s, substream) { 1949 if (s->runtime == to_check) { 1950 remove_wait_queue(&to_check->sleep, &wait); 1951 break; 1952 } 1953 } 1954 snd_pcm_group_unref(group, substream); 1955 1956 if (card->shutdown) { 1957 result = -ENODEV; 1958 break; 1959 } 1960 if (tout == 0) { 1961 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1962 result = -ESTRPIPE; 1963 else { 1964 dev_dbg(substream->pcm->card->dev, 1965 "playback drain error (DMA or IRQ trouble?)\n"); 1966 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1967 result = -EIO; 1968 } 1969 break; 1970 } 1971 } 1972 1973 unlock: 1974 snd_pcm_stream_unlock_irq(substream); 1975 1976 return result; 1977 } 1978 1979 /* 1980 * drop ioctl 1981 * 1982 * Immediately put all linked substreams into SETUP state. 1983 */ 1984 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1985 { 1986 struct snd_pcm_runtime *runtime; 1987 int result = 0; 1988 1989 if (PCM_RUNTIME_CHECK(substream)) 1990 return -ENXIO; 1991 runtime = substream->runtime; 1992 1993 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1994 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1995 return -EBADFD; 1996 1997 snd_pcm_stream_lock_irq(substream); 1998 /* resume pause */ 1999 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 2000 snd_pcm_pause(substream, 0); 2001 2002 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2003 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 2004 snd_pcm_stream_unlock_irq(substream); 2005 2006 return result; 2007 } 2008 2009 2010 static bool is_pcm_file(struct file *file) 2011 { 2012 struct inode *inode = file_inode(file); 2013 struct snd_pcm *pcm; 2014 unsigned int minor; 2015 2016 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 2017 return false; 2018 minor = iminor(inode); 2019 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2020 if (!pcm) 2021 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2022 if (!pcm) 2023 return false; 2024 snd_card_unref(pcm->card); 2025 return true; 2026 } 2027 2028 /* 2029 * PCM link handling 2030 */ 2031 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 2032 { 2033 int res = 0; 2034 struct snd_pcm_file *pcm_file; 2035 struct snd_pcm_substream *substream1; 2036 struct snd_pcm_group *group, *target_group; 2037 bool nonatomic = substream->pcm->nonatomic; 2038 struct fd f = fdget(fd); 2039 2040 if (!f.file) 2041 return -EBADFD; 2042 if (!is_pcm_file(f.file)) { 2043 res = -EBADFD; 2044 goto _badf; 2045 } 2046 pcm_file = f.file->private_data; 2047 substream1 = pcm_file->substream; 2048 group = kzalloc(sizeof(*group), GFP_KERNEL); 2049 if (!group) { 2050 res = -ENOMEM; 2051 goto _nolock; 2052 } 2053 snd_pcm_group_init(group); 2054 2055 down_write_nonfifo(&snd_pcm_link_rwsem); 2056 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 2057 substream->runtime->status->state != substream1->runtime->status->state || 2058 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2059 res = -EBADFD; 2060 goto _end; 2061 } 2062 if (snd_pcm_stream_linked(substream1)) { 2063 res = -EALREADY; 2064 goto _end; 2065 } 2066 2067 snd_pcm_stream_lock_irq(substream); 2068 if (!snd_pcm_stream_linked(substream)) { 2069 snd_pcm_group_assign(substream, group); 2070 group = NULL; /* assigned, don't free this one below */ 2071 } 2072 target_group = substream->group; 2073 snd_pcm_stream_unlock_irq(substream); 2074 2075 snd_pcm_group_lock_irq(target_group, nonatomic); 2076 snd_pcm_stream_lock(substream1); 2077 snd_pcm_group_assign(substream1, target_group); 2078 snd_pcm_stream_unlock(substream1); 2079 snd_pcm_group_unlock_irq(target_group, nonatomic); 2080 _end: 2081 up_write(&snd_pcm_link_rwsem); 2082 _nolock: 2083 kfree(group); 2084 _badf: 2085 fdput(f); 2086 return res; 2087 } 2088 2089 static void relink_to_local(struct snd_pcm_substream *substream) 2090 { 2091 snd_pcm_stream_lock(substream); 2092 snd_pcm_group_assign(substream, &substream->self_group); 2093 snd_pcm_stream_unlock(substream); 2094 } 2095 2096 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2097 { 2098 struct snd_pcm_group *group; 2099 bool nonatomic = substream->pcm->nonatomic; 2100 bool do_free = false; 2101 int res = 0; 2102 2103 down_write_nonfifo(&snd_pcm_link_rwsem); 2104 2105 if (!snd_pcm_stream_linked(substream)) { 2106 res = -EALREADY; 2107 goto _end; 2108 } 2109 2110 group = substream->group; 2111 snd_pcm_group_lock_irq(group, nonatomic); 2112 2113 relink_to_local(substream); 2114 2115 /* detach the last stream, too */ 2116 if (list_is_singular(&group->substreams)) { 2117 relink_to_local(list_first_entry(&group->substreams, 2118 struct snd_pcm_substream, 2119 link_list)); 2120 do_free = !refcount_read(&group->refs); 2121 } 2122 2123 snd_pcm_group_unlock_irq(group, nonatomic); 2124 if (do_free) 2125 kfree(group); 2126 2127 _end: 2128 up_write(&snd_pcm_link_rwsem); 2129 return res; 2130 } 2131 2132 /* 2133 * hw configurator 2134 */ 2135 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2136 struct snd_pcm_hw_rule *rule) 2137 { 2138 struct snd_interval t; 2139 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2140 hw_param_interval_c(params, rule->deps[1]), &t); 2141 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2142 } 2143 2144 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2145 struct snd_pcm_hw_rule *rule) 2146 { 2147 struct snd_interval t; 2148 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2149 hw_param_interval_c(params, rule->deps[1]), &t); 2150 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2151 } 2152 2153 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2154 struct snd_pcm_hw_rule *rule) 2155 { 2156 struct snd_interval t; 2157 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2158 hw_param_interval_c(params, rule->deps[1]), 2159 (unsigned long) rule->private, &t); 2160 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2161 } 2162 2163 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2164 struct snd_pcm_hw_rule *rule) 2165 { 2166 struct snd_interval t; 2167 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2168 (unsigned long) rule->private, 2169 hw_param_interval_c(params, rule->deps[1]), &t); 2170 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2171 } 2172 2173 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2174 struct snd_pcm_hw_rule *rule) 2175 { 2176 unsigned int k; 2177 const struct snd_interval *i = 2178 hw_param_interval_c(params, rule->deps[0]); 2179 struct snd_mask m; 2180 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2181 snd_mask_any(&m); 2182 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2183 int bits; 2184 if (! snd_mask_test(mask, k)) 2185 continue; 2186 bits = snd_pcm_format_physical_width(k); 2187 if (bits <= 0) 2188 continue; /* ignore invalid formats */ 2189 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2190 snd_mask_reset(&m, k); 2191 } 2192 return snd_mask_refine(mask, &m); 2193 } 2194 2195 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2196 struct snd_pcm_hw_rule *rule) 2197 { 2198 struct snd_interval t; 2199 unsigned int k; 2200 t.min = UINT_MAX; 2201 t.max = 0; 2202 t.openmin = 0; 2203 t.openmax = 0; 2204 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2205 int bits; 2206 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2207 continue; 2208 bits = snd_pcm_format_physical_width(k); 2209 if (bits <= 0) 2210 continue; /* ignore invalid formats */ 2211 if (t.min > (unsigned)bits) 2212 t.min = bits; 2213 if (t.max < (unsigned)bits) 2214 t.max = bits; 2215 } 2216 t.integer = 1; 2217 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2218 } 2219 2220 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2221 #error "Change this table" 2222 #endif 2223 2224 static const unsigned int rates[] = { 2225 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2226 48000, 64000, 88200, 96000, 176400, 192000 2227 }; 2228 2229 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2230 .count = ARRAY_SIZE(rates), 2231 .list = rates, 2232 }; 2233 2234 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2235 struct snd_pcm_hw_rule *rule) 2236 { 2237 struct snd_pcm_hardware *hw = rule->private; 2238 return snd_interval_list(hw_param_interval(params, rule->var), 2239 snd_pcm_known_rates.count, 2240 snd_pcm_known_rates.list, hw->rates); 2241 } 2242 2243 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2244 struct snd_pcm_hw_rule *rule) 2245 { 2246 struct snd_interval t; 2247 struct snd_pcm_substream *substream = rule->private; 2248 t.min = 0; 2249 t.max = substream->buffer_bytes_max; 2250 t.openmin = 0; 2251 t.openmax = 0; 2252 t.integer = 1; 2253 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2254 } 2255 2256 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2257 { 2258 struct snd_pcm_runtime *runtime = substream->runtime; 2259 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2260 int k, err; 2261 2262 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2263 snd_mask_any(constrs_mask(constrs, k)); 2264 } 2265 2266 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2267 snd_interval_any(constrs_interval(constrs, k)); 2268 } 2269 2270 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2271 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2272 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2273 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2274 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2275 2276 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2277 snd_pcm_hw_rule_format, NULL, 2278 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2279 if (err < 0) 2280 return err; 2281 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2282 snd_pcm_hw_rule_sample_bits, NULL, 2283 SNDRV_PCM_HW_PARAM_FORMAT, 2284 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2285 if (err < 0) 2286 return err; 2287 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2288 snd_pcm_hw_rule_div, NULL, 2289 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2290 if (err < 0) 2291 return err; 2292 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2293 snd_pcm_hw_rule_mul, NULL, 2294 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2295 if (err < 0) 2296 return err; 2297 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2298 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2299 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2300 if (err < 0) 2301 return err; 2302 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2303 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2304 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2305 if (err < 0) 2306 return err; 2307 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2308 snd_pcm_hw_rule_div, NULL, 2309 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2310 if (err < 0) 2311 return err; 2312 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2313 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2314 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2315 if (err < 0) 2316 return err; 2317 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2318 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2319 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2320 if (err < 0) 2321 return err; 2322 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2323 snd_pcm_hw_rule_div, NULL, 2324 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2325 if (err < 0) 2326 return err; 2327 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2328 snd_pcm_hw_rule_div, NULL, 2329 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2330 if (err < 0) 2331 return err; 2332 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2333 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2334 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2335 if (err < 0) 2336 return err; 2337 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2338 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2339 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2340 if (err < 0) 2341 return err; 2342 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2343 snd_pcm_hw_rule_mul, NULL, 2344 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2345 if (err < 0) 2346 return err; 2347 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2348 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2349 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2350 if (err < 0) 2351 return err; 2352 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2353 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2354 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2355 if (err < 0) 2356 return err; 2357 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2358 snd_pcm_hw_rule_muldivk, (void*) 8, 2359 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2360 if (err < 0) 2361 return err; 2362 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2363 snd_pcm_hw_rule_muldivk, (void*) 8, 2364 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2365 if (err < 0) 2366 return err; 2367 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2368 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2369 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2370 if (err < 0) 2371 return err; 2372 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2373 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2374 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2375 if (err < 0) 2376 return err; 2377 return 0; 2378 } 2379 2380 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2381 { 2382 struct snd_pcm_runtime *runtime = substream->runtime; 2383 struct snd_pcm_hardware *hw = &runtime->hw; 2384 int err; 2385 unsigned int mask = 0; 2386 2387 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2388 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2389 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2390 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2391 if (hw_support_mmap(substream)) { 2392 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2393 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2394 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2395 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2396 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2397 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2398 } 2399 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2400 if (err < 0) 2401 return err; 2402 2403 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2404 if (err < 0) 2405 return err; 2406 2407 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2408 if (err < 0) 2409 return err; 2410 2411 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2412 hw->channels_min, hw->channels_max); 2413 if (err < 0) 2414 return err; 2415 2416 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2417 hw->rate_min, hw->rate_max); 2418 if (err < 0) 2419 return err; 2420 2421 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2422 hw->period_bytes_min, hw->period_bytes_max); 2423 if (err < 0) 2424 return err; 2425 2426 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2427 hw->periods_min, hw->periods_max); 2428 if (err < 0) 2429 return err; 2430 2431 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2432 hw->period_bytes_min, hw->buffer_bytes_max); 2433 if (err < 0) 2434 return err; 2435 2436 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2437 snd_pcm_hw_rule_buffer_bytes_max, substream, 2438 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2439 if (err < 0) 2440 return err; 2441 2442 /* FIXME: remove */ 2443 if (runtime->dma_bytes) { 2444 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2445 if (err < 0) 2446 return err; 2447 } 2448 2449 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2450 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2451 snd_pcm_hw_rule_rate, hw, 2452 SNDRV_PCM_HW_PARAM_RATE, -1); 2453 if (err < 0) 2454 return err; 2455 } 2456 2457 /* FIXME: this belong to lowlevel */ 2458 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2459 2460 return 0; 2461 } 2462 2463 static void pcm_release_private(struct snd_pcm_substream *substream) 2464 { 2465 if (snd_pcm_stream_linked(substream)) 2466 snd_pcm_unlink(substream); 2467 } 2468 2469 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2470 { 2471 substream->ref_count--; 2472 if (substream->ref_count > 0) 2473 return; 2474 2475 snd_pcm_drop(substream); 2476 if (substream->hw_opened) { 2477 if (substream->ops->hw_free && 2478 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2479 substream->ops->hw_free(substream); 2480 substream->ops->close(substream); 2481 substream->hw_opened = 0; 2482 } 2483 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2484 pm_qos_remove_request(&substream->latency_pm_qos_req); 2485 if (substream->pcm_release) { 2486 substream->pcm_release(substream); 2487 substream->pcm_release = NULL; 2488 } 2489 snd_pcm_detach_substream(substream); 2490 } 2491 EXPORT_SYMBOL(snd_pcm_release_substream); 2492 2493 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2494 struct file *file, 2495 struct snd_pcm_substream **rsubstream) 2496 { 2497 struct snd_pcm_substream *substream; 2498 int err; 2499 2500 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2501 if (err < 0) 2502 return err; 2503 if (substream->ref_count > 1) { 2504 *rsubstream = substream; 2505 return 0; 2506 } 2507 2508 err = snd_pcm_hw_constraints_init(substream); 2509 if (err < 0) { 2510 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2511 goto error; 2512 } 2513 2514 if ((err = substream->ops->open(substream)) < 0) 2515 goto error; 2516 2517 substream->hw_opened = 1; 2518 2519 err = snd_pcm_hw_constraints_complete(substream); 2520 if (err < 0) { 2521 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2522 goto error; 2523 } 2524 2525 *rsubstream = substream; 2526 return 0; 2527 2528 error: 2529 snd_pcm_release_substream(substream); 2530 return err; 2531 } 2532 EXPORT_SYMBOL(snd_pcm_open_substream); 2533 2534 static int snd_pcm_open_file(struct file *file, 2535 struct snd_pcm *pcm, 2536 int stream) 2537 { 2538 struct snd_pcm_file *pcm_file; 2539 struct snd_pcm_substream *substream; 2540 int err; 2541 2542 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2543 if (err < 0) 2544 return err; 2545 2546 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2547 if (pcm_file == NULL) { 2548 snd_pcm_release_substream(substream); 2549 return -ENOMEM; 2550 } 2551 pcm_file->substream = substream; 2552 if (substream->ref_count == 1) { 2553 substream->file = pcm_file; 2554 substream->pcm_release = pcm_release_private; 2555 } 2556 file->private_data = pcm_file; 2557 2558 return 0; 2559 } 2560 2561 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2562 { 2563 struct snd_pcm *pcm; 2564 int err = nonseekable_open(inode, file); 2565 if (err < 0) 2566 return err; 2567 pcm = snd_lookup_minor_data(iminor(inode), 2568 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2569 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2570 if (pcm) 2571 snd_card_unref(pcm->card); 2572 return err; 2573 } 2574 2575 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2576 { 2577 struct snd_pcm *pcm; 2578 int err = nonseekable_open(inode, file); 2579 if (err < 0) 2580 return err; 2581 pcm = snd_lookup_minor_data(iminor(inode), 2582 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2583 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2584 if (pcm) 2585 snd_card_unref(pcm->card); 2586 return err; 2587 } 2588 2589 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2590 { 2591 int err; 2592 wait_queue_entry_t wait; 2593 2594 if (pcm == NULL) { 2595 err = -ENODEV; 2596 goto __error1; 2597 } 2598 err = snd_card_file_add(pcm->card, file); 2599 if (err < 0) 2600 goto __error1; 2601 if (!try_module_get(pcm->card->module)) { 2602 err = -EFAULT; 2603 goto __error2; 2604 } 2605 init_waitqueue_entry(&wait, current); 2606 add_wait_queue(&pcm->open_wait, &wait); 2607 mutex_lock(&pcm->open_mutex); 2608 while (1) { 2609 err = snd_pcm_open_file(file, pcm, stream); 2610 if (err >= 0) 2611 break; 2612 if (err == -EAGAIN) { 2613 if (file->f_flags & O_NONBLOCK) { 2614 err = -EBUSY; 2615 break; 2616 } 2617 } else 2618 break; 2619 set_current_state(TASK_INTERRUPTIBLE); 2620 mutex_unlock(&pcm->open_mutex); 2621 schedule(); 2622 mutex_lock(&pcm->open_mutex); 2623 if (pcm->card->shutdown) { 2624 err = -ENODEV; 2625 break; 2626 } 2627 if (signal_pending(current)) { 2628 err = -ERESTARTSYS; 2629 break; 2630 } 2631 } 2632 remove_wait_queue(&pcm->open_wait, &wait); 2633 mutex_unlock(&pcm->open_mutex); 2634 if (err < 0) 2635 goto __error; 2636 return err; 2637 2638 __error: 2639 module_put(pcm->card->module); 2640 __error2: 2641 snd_card_file_remove(pcm->card, file); 2642 __error1: 2643 return err; 2644 } 2645 2646 static int snd_pcm_release(struct inode *inode, struct file *file) 2647 { 2648 struct snd_pcm *pcm; 2649 struct snd_pcm_substream *substream; 2650 struct snd_pcm_file *pcm_file; 2651 2652 pcm_file = file->private_data; 2653 substream = pcm_file->substream; 2654 if (snd_BUG_ON(!substream)) 2655 return -ENXIO; 2656 pcm = substream->pcm; 2657 mutex_lock(&pcm->open_mutex); 2658 snd_pcm_release_substream(substream); 2659 kfree(pcm_file); 2660 mutex_unlock(&pcm->open_mutex); 2661 wake_up(&pcm->open_wait); 2662 module_put(pcm->card->module); 2663 snd_card_file_remove(pcm->card, file); 2664 return 0; 2665 } 2666 2667 /* check and update PCM state; return 0 or a negative error 2668 * call this inside PCM lock 2669 */ 2670 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2671 { 2672 switch (substream->runtime->status->state) { 2673 case SNDRV_PCM_STATE_DRAINING: 2674 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2675 return -EBADFD; 2676 /* Fall through */ 2677 case SNDRV_PCM_STATE_RUNNING: 2678 return snd_pcm_update_hw_ptr(substream); 2679 case SNDRV_PCM_STATE_PREPARED: 2680 case SNDRV_PCM_STATE_PAUSED: 2681 return 0; 2682 case SNDRV_PCM_STATE_SUSPENDED: 2683 return -ESTRPIPE; 2684 case SNDRV_PCM_STATE_XRUN: 2685 return -EPIPE; 2686 default: 2687 return -EBADFD; 2688 } 2689 } 2690 2691 /* increase the appl_ptr; returns the processed frames or a negative error */ 2692 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2693 snd_pcm_uframes_t frames, 2694 snd_pcm_sframes_t avail) 2695 { 2696 struct snd_pcm_runtime *runtime = substream->runtime; 2697 snd_pcm_sframes_t appl_ptr; 2698 int ret; 2699 2700 if (avail <= 0) 2701 return 0; 2702 if (frames > (snd_pcm_uframes_t)avail) 2703 frames = avail; 2704 appl_ptr = runtime->control->appl_ptr + frames; 2705 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2706 appl_ptr -= runtime->boundary; 2707 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2708 return ret < 0 ? ret : frames; 2709 } 2710 2711 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2712 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2713 snd_pcm_uframes_t frames, 2714 snd_pcm_sframes_t avail) 2715 { 2716 struct snd_pcm_runtime *runtime = substream->runtime; 2717 snd_pcm_sframes_t appl_ptr; 2718 int ret; 2719 2720 if (avail <= 0) 2721 return 0; 2722 if (frames > (snd_pcm_uframes_t)avail) 2723 frames = avail; 2724 appl_ptr = runtime->control->appl_ptr - frames; 2725 if (appl_ptr < 0) 2726 appl_ptr += runtime->boundary; 2727 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2728 /* NOTE: we return zero for errors because PulseAudio gets depressed 2729 * upon receiving an error from rewind ioctl and stops processing 2730 * any longer. Returning zero means that no rewind is done, so 2731 * it's not absolutely wrong to answer like that. 2732 */ 2733 return ret < 0 ? 0 : frames; 2734 } 2735 2736 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2737 snd_pcm_uframes_t frames) 2738 { 2739 snd_pcm_sframes_t ret; 2740 2741 if (frames == 0) 2742 return 0; 2743 2744 snd_pcm_stream_lock_irq(substream); 2745 ret = do_pcm_hwsync(substream); 2746 if (!ret) 2747 ret = rewind_appl_ptr(substream, frames, 2748 snd_pcm_hw_avail(substream)); 2749 snd_pcm_stream_unlock_irq(substream); 2750 return ret; 2751 } 2752 2753 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2754 snd_pcm_uframes_t frames) 2755 { 2756 snd_pcm_sframes_t ret; 2757 2758 if (frames == 0) 2759 return 0; 2760 2761 snd_pcm_stream_lock_irq(substream); 2762 ret = do_pcm_hwsync(substream); 2763 if (!ret) 2764 ret = forward_appl_ptr(substream, frames, 2765 snd_pcm_avail(substream)); 2766 snd_pcm_stream_unlock_irq(substream); 2767 return ret; 2768 } 2769 2770 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2771 { 2772 int err; 2773 2774 snd_pcm_stream_lock_irq(substream); 2775 err = do_pcm_hwsync(substream); 2776 snd_pcm_stream_unlock_irq(substream); 2777 return err; 2778 } 2779 2780 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2781 snd_pcm_sframes_t *delay) 2782 { 2783 int err; 2784 snd_pcm_sframes_t n = 0; 2785 2786 snd_pcm_stream_lock_irq(substream); 2787 err = do_pcm_hwsync(substream); 2788 if (!err) 2789 n = snd_pcm_calc_delay(substream); 2790 snd_pcm_stream_unlock_irq(substream); 2791 if (!err) 2792 *delay = n; 2793 return err; 2794 } 2795 2796 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2797 struct snd_pcm_sync_ptr __user *_sync_ptr) 2798 { 2799 struct snd_pcm_runtime *runtime = substream->runtime; 2800 struct snd_pcm_sync_ptr sync_ptr; 2801 volatile struct snd_pcm_mmap_status *status; 2802 volatile struct snd_pcm_mmap_control *control; 2803 int err; 2804 2805 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2806 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2807 return -EFAULT; 2808 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2809 return -EFAULT; 2810 status = runtime->status; 2811 control = runtime->control; 2812 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2813 err = snd_pcm_hwsync(substream); 2814 if (err < 0) 2815 return err; 2816 } 2817 snd_pcm_stream_lock_irq(substream); 2818 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2819 err = pcm_lib_apply_appl_ptr(substream, 2820 sync_ptr.c.control.appl_ptr); 2821 if (err < 0) { 2822 snd_pcm_stream_unlock_irq(substream); 2823 return err; 2824 } 2825 } else { 2826 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2827 } 2828 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2829 control->avail_min = sync_ptr.c.control.avail_min; 2830 else 2831 sync_ptr.c.control.avail_min = control->avail_min; 2832 sync_ptr.s.status.state = status->state; 2833 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2834 sync_ptr.s.status.tstamp = status->tstamp; 2835 sync_ptr.s.status.suspended_state = status->suspended_state; 2836 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2837 snd_pcm_stream_unlock_irq(substream); 2838 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2839 return -EFAULT; 2840 return 0; 2841 } 2842 2843 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2844 { 2845 struct snd_pcm_runtime *runtime = substream->runtime; 2846 int arg; 2847 2848 if (get_user(arg, _arg)) 2849 return -EFAULT; 2850 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2851 return -EINVAL; 2852 runtime->tstamp_type = arg; 2853 return 0; 2854 } 2855 2856 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2857 struct snd_xferi __user *_xferi) 2858 { 2859 struct snd_xferi xferi; 2860 struct snd_pcm_runtime *runtime = substream->runtime; 2861 snd_pcm_sframes_t result; 2862 2863 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2864 return -EBADFD; 2865 if (put_user(0, &_xferi->result)) 2866 return -EFAULT; 2867 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2868 return -EFAULT; 2869 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2870 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2871 else 2872 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2873 __put_user(result, &_xferi->result); 2874 return result < 0 ? result : 0; 2875 } 2876 2877 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2878 struct snd_xfern __user *_xfern) 2879 { 2880 struct snd_xfern xfern; 2881 struct snd_pcm_runtime *runtime = substream->runtime; 2882 void *bufs; 2883 snd_pcm_sframes_t result; 2884 2885 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2886 return -EBADFD; 2887 if (runtime->channels > 128) 2888 return -EINVAL; 2889 if (put_user(0, &_xfern->result)) 2890 return -EFAULT; 2891 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2892 return -EFAULT; 2893 2894 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2895 if (IS_ERR(bufs)) 2896 return PTR_ERR(bufs); 2897 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2898 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2899 else 2900 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2901 kfree(bufs); 2902 __put_user(result, &_xfern->result); 2903 return result < 0 ? result : 0; 2904 } 2905 2906 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2907 snd_pcm_uframes_t __user *_frames) 2908 { 2909 snd_pcm_uframes_t frames; 2910 snd_pcm_sframes_t result; 2911 2912 if (get_user(frames, _frames)) 2913 return -EFAULT; 2914 if (put_user(0, _frames)) 2915 return -EFAULT; 2916 result = snd_pcm_rewind(substream, frames); 2917 __put_user(result, _frames); 2918 return result < 0 ? result : 0; 2919 } 2920 2921 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2922 snd_pcm_uframes_t __user *_frames) 2923 { 2924 snd_pcm_uframes_t frames; 2925 snd_pcm_sframes_t result; 2926 2927 if (get_user(frames, _frames)) 2928 return -EFAULT; 2929 if (put_user(0, _frames)) 2930 return -EFAULT; 2931 result = snd_pcm_forward(substream, frames); 2932 __put_user(result, _frames); 2933 return result < 0 ? result : 0; 2934 } 2935 2936 static int snd_pcm_common_ioctl(struct file *file, 2937 struct snd_pcm_substream *substream, 2938 unsigned int cmd, void __user *arg) 2939 { 2940 struct snd_pcm_file *pcm_file = file->private_data; 2941 int res; 2942 2943 if (PCM_RUNTIME_CHECK(substream)) 2944 return -ENXIO; 2945 2946 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2947 if (res < 0) 2948 return res; 2949 2950 switch (cmd) { 2951 case SNDRV_PCM_IOCTL_PVERSION: 2952 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2953 case SNDRV_PCM_IOCTL_INFO: 2954 return snd_pcm_info_user(substream, arg); 2955 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2956 return 0; 2957 case SNDRV_PCM_IOCTL_TTSTAMP: 2958 return snd_pcm_tstamp(substream, arg); 2959 case SNDRV_PCM_IOCTL_USER_PVERSION: 2960 if (get_user(pcm_file->user_pversion, 2961 (unsigned int __user *)arg)) 2962 return -EFAULT; 2963 return 0; 2964 case SNDRV_PCM_IOCTL_HW_REFINE: 2965 return snd_pcm_hw_refine_user(substream, arg); 2966 case SNDRV_PCM_IOCTL_HW_PARAMS: 2967 return snd_pcm_hw_params_user(substream, arg); 2968 case SNDRV_PCM_IOCTL_HW_FREE: 2969 return snd_pcm_hw_free(substream); 2970 case SNDRV_PCM_IOCTL_SW_PARAMS: 2971 return snd_pcm_sw_params_user(substream, arg); 2972 case SNDRV_PCM_IOCTL_STATUS: 2973 return snd_pcm_status_user(substream, arg, false); 2974 case SNDRV_PCM_IOCTL_STATUS_EXT: 2975 return snd_pcm_status_user(substream, arg, true); 2976 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2977 return snd_pcm_channel_info_user(substream, arg); 2978 case SNDRV_PCM_IOCTL_PREPARE: 2979 return snd_pcm_prepare(substream, file); 2980 case SNDRV_PCM_IOCTL_RESET: 2981 return snd_pcm_reset(substream); 2982 case SNDRV_PCM_IOCTL_START: 2983 return snd_pcm_start_lock_irq(substream); 2984 case SNDRV_PCM_IOCTL_LINK: 2985 return snd_pcm_link(substream, (int)(unsigned long) arg); 2986 case SNDRV_PCM_IOCTL_UNLINK: 2987 return snd_pcm_unlink(substream); 2988 case SNDRV_PCM_IOCTL_RESUME: 2989 return snd_pcm_resume(substream); 2990 case SNDRV_PCM_IOCTL_XRUN: 2991 return snd_pcm_xrun(substream); 2992 case SNDRV_PCM_IOCTL_HWSYNC: 2993 return snd_pcm_hwsync(substream); 2994 case SNDRV_PCM_IOCTL_DELAY: 2995 { 2996 snd_pcm_sframes_t delay; 2997 snd_pcm_sframes_t __user *res = arg; 2998 int err; 2999 3000 err = snd_pcm_delay(substream, &delay); 3001 if (err) 3002 return err; 3003 if (put_user(delay, res)) 3004 return -EFAULT; 3005 return 0; 3006 } 3007 case SNDRV_PCM_IOCTL_SYNC_PTR: 3008 return snd_pcm_sync_ptr(substream, arg); 3009 #ifdef CONFIG_SND_SUPPORT_OLD_API 3010 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 3011 return snd_pcm_hw_refine_old_user(substream, arg); 3012 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 3013 return snd_pcm_hw_params_old_user(substream, arg); 3014 #endif 3015 case SNDRV_PCM_IOCTL_DRAIN: 3016 return snd_pcm_drain(substream, file); 3017 case SNDRV_PCM_IOCTL_DROP: 3018 return snd_pcm_drop(substream); 3019 case SNDRV_PCM_IOCTL_PAUSE: 3020 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 3021 substream, 3022 (int)(unsigned long)arg); 3023 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 3024 case SNDRV_PCM_IOCTL_READI_FRAMES: 3025 return snd_pcm_xferi_frames_ioctl(substream, arg); 3026 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 3027 case SNDRV_PCM_IOCTL_READN_FRAMES: 3028 return snd_pcm_xfern_frames_ioctl(substream, arg); 3029 case SNDRV_PCM_IOCTL_REWIND: 3030 return snd_pcm_rewind_ioctl(substream, arg); 3031 case SNDRV_PCM_IOCTL_FORWARD: 3032 return snd_pcm_forward_ioctl(substream, arg); 3033 } 3034 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 3035 return -ENOTTY; 3036 } 3037 3038 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 3039 unsigned long arg) 3040 { 3041 struct snd_pcm_file *pcm_file; 3042 3043 pcm_file = file->private_data; 3044 3045 if (((cmd >> 8) & 0xff) != 'A') 3046 return -ENOTTY; 3047 3048 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 3049 (void __user *)arg); 3050 } 3051 3052 /** 3053 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3054 * @substream: PCM substream 3055 * @cmd: IOCTL cmd 3056 * @arg: IOCTL argument 3057 * 3058 * The function is provided primarily for OSS layer and USB gadget drivers, 3059 * and it allows only the limited set of ioctls (hw_params, sw_params, 3060 * prepare, start, drain, drop, forward). 3061 */ 3062 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3063 unsigned int cmd, void *arg) 3064 { 3065 snd_pcm_uframes_t *frames = arg; 3066 snd_pcm_sframes_t result; 3067 3068 switch (cmd) { 3069 case SNDRV_PCM_IOCTL_FORWARD: 3070 { 3071 /* provided only for OSS; capture-only and no value returned */ 3072 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3073 return -EINVAL; 3074 result = snd_pcm_forward(substream, *frames); 3075 return result < 0 ? result : 0; 3076 } 3077 case SNDRV_PCM_IOCTL_HW_PARAMS: 3078 return snd_pcm_hw_params(substream, arg); 3079 case SNDRV_PCM_IOCTL_SW_PARAMS: 3080 return snd_pcm_sw_params(substream, arg); 3081 case SNDRV_PCM_IOCTL_PREPARE: 3082 return snd_pcm_prepare(substream, NULL); 3083 case SNDRV_PCM_IOCTL_START: 3084 return snd_pcm_start_lock_irq(substream); 3085 case SNDRV_PCM_IOCTL_DRAIN: 3086 return snd_pcm_drain(substream, NULL); 3087 case SNDRV_PCM_IOCTL_DROP: 3088 return snd_pcm_drop(substream); 3089 case SNDRV_PCM_IOCTL_DELAY: 3090 return snd_pcm_delay(substream, frames); 3091 default: 3092 return -EINVAL; 3093 } 3094 } 3095 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3096 3097 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3098 loff_t * offset) 3099 { 3100 struct snd_pcm_file *pcm_file; 3101 struct snd_pcm_substream *substream; 3102 struct snd_pcm_runtime *runtime; 3103 snd_pcm_sframes_t result; 3104 3105 pcm_file = file->private_data; 3106 substream = pcm_file->substream; 3107 if (PCM_RUNTIME_CHECK(substream)) 3108 return -ENXIO; 3109 runtime = substream->runtime; 3110 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3111 return -EBADFD; 3112 if (!frame_aligned(runtime, count)) 3113 return -EINVAL; 3114 count = bytes_to_frames(runtime, count); 3115 result = snd_pcm_lib_read(substream, buf, count); 3116 if (result > 0) 3117 result = frames_to_bytes(runtime, result); 3118 return result; 3119 } 3120 3121 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3122 size_t count, loff_t * offset) 3123 { 3124 struct snd_pcm_file *pcm_file; 3125 struct snd_pcm_substream *substream; 3126 struct snd_pcm_runtime *runtime; 3127 snd_pcm_sframes_t result; 3128 3129 pcm_file = file->private_data; 3130 substream = pcm_file->substream; 3131 if (PCM_RUNTIME_CHECK(substream)) 3132 return -ENXIO; 3133 runtime = substream->runtime; 3134 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3135 return -EBADFD; 3136 if (!frame_aligned(runtime, count)) 3137 return -EINVAL; 3138 count = bytes_to_frames(runtime, count); 3139 result = snd_pcm_lib_write(substream, buf, count); 3140 if (result > 0) 3141 result = frames_to_bytes(runtime, result); 3142 return result; 3143 } 3144 3145 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3146 { 3147 struct snd_pcm_file *pcm_file; 3148 struct snd_pcm_substream *substream; 3149 struct snd_pcm_runtime *runtime; 3150 snd_pcm_sframes_t result; 3151 unsigned long i; 3152 void __user **bufs; 3153 snd_pcm_uframes_t frames; 3154 3155 pcm_file = iocb->ki_filp->private_data; 3156 substream = pcm_file->substream; 3157 if (PCM_RUNTIME_CHECK(substream)) 3158 return -ENXIO; 3159 runtime = substream->runtime; 3160 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3161 return -EBADFD; 3162 if (!iter_is_iovec(to)) 3163 return -EINVAL; 3164 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3165 return -EINVAL; 3166 if (!frame_aligned(runtime, to->iov->iov_len)) 3167 return -EINVAL; 3168 frames = bytes_to_samples(runtime, to->iov->iov_len); 3169 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3170 if (bufs == NULL) 3171 return -ENOMEM; 3172 for (i = 0; i < to->nr_segs; ++i) 3173 bufs[i] = to->iov[i].iov_base; 3174 result = snd_pcm_lib_readv(substream, bufs, frames); 3175 if (result > 0) 3176 result = frames_to_bytes(runtime, result); 3177 kfree(bufs); 3178 return result; 3179 } 3180 3181 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3182 { 3183 struct snd_pcm_file *pcm_file; 3184 struct snd_pcm_substream *substream; 3185 struct snd_pcm_runtime *runtime; 3186 snd_pcm_sframes_t result; 3187 unsigned long i; 3188 void __user **bufs; 3189 snd_pcm_uframes_t frames; 3190 3191 pcm_file = iocb->ki_filp->private_data; 3192 substream = pcm_file->substream; 3193 if (PCM_RUNTIME_CHECK(substream)) 3194 return -ENXIO; 3195 runtime = substream->runtime; 3196 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3197 return -EBADFD; 3198 if (!iter_is_iovec(from)) 3199 return -EINVAL; 3200 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3201 !frame_aligned(runtime, from->iov->iov_len)) 3202 return -EINVAL; 3203 frames = bytes_to_samples(runtime, from->iov->iov_len); 3204 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3205 if (bufs == NULL) 3206 return -ENOMEM; 3207 for (i = 0; i < from->nr_segs; ++i) 3208 bufs[i] = from->iov[i].iov_base; 3209 result = snd_pcm_lib_writev(substream, bufs, frames); 3210 if (result > 0) 3211 result = frames_to_bytes(runtime, result); 3212 kfree(bufs); 3213 return result; 3214 } 3215 3216 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3217 { 3218 struct snd_pcm_file *pcm_file; 3219 struct snd_pcm_substream *substream; 3220 struct snd_pcm_runtime *runtime; 3221 __poll_t mask, ok; 3222 snd_pcm_uframes_t avail; 3223 3224 pcm_file = file->private_data; 3225 3226 substream = pcm_file->substream; 3227 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3228 ok = EPOLLOUT | EPOLLWRNORM; 3229 else 3230 ok = EPOLLIN | EPOLLRDNORM; 3231 if (PCM_RUNTIME_CHECK(substream)) 3232 return ok | EPOLLERR; 3233 3234 runtime = substream->runtime; 3235 poll_wait(file, &runtime->sleep, wait); 3236 3237 mask = 0; 3238 snd_pcm_stream_lock_irq(substream); 3239 avail = snd_pcm_avail(substream); 3240 switch (runtime->status->state) { 3241 case SNDRV_PCM_STATE_RUNNING: 3242 case SNDRV_PCM_STATE_PREPARED: 3243 case SNDRV_PCM_STATE_PAUSED: 3244 if (avail >= runtime->control->avail_min) 3245 mask = ok; 3246 break; 3247 case SNDRV_PCM_STATE_DRAINING: 3248 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3249 mask = ok; 3250 if (!avail) 3251 mask |= EPOLLERR; 3252 } 3253 break; 3254 default: 3255 mask = ok | EPOLLERR; 3256 break; 3257 } 3258 snd_pcm_stream_unlock_irq(substream); 3259 return mask; 3260 } 3261 3262 /* 3263 * mmap support 3264 */ 3265 3266 /* 3267 * Only on coherent architectures, we can mmap the status and the control records 3268 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3269 */ 3270 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3271 /* 3272 * mmap status record 3273 */ 3274 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3275 { 3276 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3277 struct snd_pcm_runtime *runtime; 3278 3279 if (substream == NULL) 3280 return VM_FAULT_SIGBUS; 3281 runtime = substream->runtime; 3282 vmf->page = virt_to_page(runtime->status); 3283 get_page(vmf->page); 3284 return 0; 3285 } 3286 3287 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3288 { 3289 .fault = snd_pcm_mmap_status_fault, 3290 }; 3291 3292 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3293 struct vm_area_struct *area) 3294 { 3295 long size; 3296 if (!(area->vm_flags & VM_READ)) 3297 return -EINVAL; 3298 size = area->vm_end - area->vm_start; 3299 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3300 return -EINVAL; 3301 area->vm_ops = &snd_pcm_vm_ops_status; 3302 area->vm_private_data = substream; 3303 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3304 return 0; 3305 } 3306 3307 /* 3308 * mmap control record 3309 */ 3310 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3311 { 3312 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3313 struct snd_pcm_runtime *runtime; 3314 3315 if (substream == NULL) 3316 return VM_FAULT_SIGBUS; 3317 runtime = substream->runtime; 3318 vmf->page = virt_to_page(runtime->control); 3319 get_page(vmf->page); 3320 return 0; 3321 } 3322 3323 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3324 { 3325 .fault = snd_pcm_mmap_control_fault, 3326 }; 3327 3328 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3329 struct vm_area_struct *area) 3330 { 3331 long size; 3332 if (!(area->vm_flags & VM_READ)) 3333 return -EINVAL; 3334 size = area->vm_end - area->vm_start; 3335 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3336 return -EINVAL; 3337 area->vm_ops = &snd_pcm_vm_ops_control; 3338 area->vm_private_data = substream; 3339 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3340 return 0; 3341 } 3342 3343 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3344 { 3345 if (pcm_file->no_compat_mmap) 3346 return false; 3347 /* See pcm_control_mmap_allowed() below. 3348 * Since older alsa-lib requires both status and control mmaps to be 3349 * coupled, we have to disable the status mmap for old alsa-lib, too. 3350 */ 3351 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3352 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3353 return false; 3354 return true; 3355 } 3356 3357 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3358 { 3359 if (pcm_file->no_compat_mmap) 3360 return false; 3361 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3362 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3363 * thus it effectively assures the manual update of appl_ptr. 3364 */ 3365 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3366 return false; 3367 return true; 3368 } 3369 3370 #else /* ! coherent mmap */ 3371 /* 3372 * don't support mmap for status and control records. 3373 */ 3374 #define pcm_status_mmap_allowed(pcm_file) false 3375 #define pcm_control_mmap_allowed(pcm_file) false 3376 3377 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3378 struct vm_area_struct *area) 3379 { 3380 return -ENXIO; 3381 } 3382 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3383 struct vm_area_struct *area) 3384 { 3385 return -ENXIO; 3386 } 3387 #endif /* coherent mmap */ 3388 3389 static inline struct page * 3390 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3391 { 3392 void *vaddr = substream->runtime->dma_area + ofs; 3393 return virt_to_page(vaddr); 3394 } 3395 3396 /* 3397 * fault callback for mmapping a RAM page 3398 */ 3399 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3400 { 3401 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3402 struct snd_pcm_runtime *runtime; 3403 unsigned long offset; 3404 struct page * page; 3405 size_t dma_bytes; 3406 3407 if (substream == NULL) 3408 return VM_FAULT_SIGBUS; 3409 runtime = substream->runtime; 3410 offset = vmf->pgoff << PAGE_SHIFT; 3411 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3412 if (offset > dma_bytes - PAGE_SIZE) 3413 return VM_FAULT_SIGBUS; 3414 if (substream->ops->page) 3415 page = substream->ops->page(substream, offset); 3416 else 3417 page = snd_pcm_default_page_ops(substream, offset); 3418 if (!page) 3419 return VM_FAULT_SIGBUS; 3420 get_page(page); 3421 vmf->page = page; 3422 return 0; 3423 } 3424 3425 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3426 .open = snd_pcm_mmap_data_open, 3427 .close = snd_pcm_mmap_data_close, 3428 }; 3429 3430 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3431 .open = snd_pcm_mmap_data_open, 3432 .close = snd_pcm_mmap_data_close, 3433 .fault = snd_pcm_mmap_data_fault, 3434 }; 3435 3436 /* 3437 * mmap the DMA buffer on RAM 3438 */ 3439 3440 /** 3441 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3442 * @substream: PCM substream 3443 * @area: VMA 3444 * 3445 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3446 * this function is invoked implicitly. 3447 */ 3448 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3449 struct vm_area_struct *area) 3450 { 3451 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3452 #ifdef CONFIG_GENERIC_ALLOCATOR 3453 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3454 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3455 return remap_pfn_range(area, area->vm_start, 3456 substream->dma_buffer.addr >> PAGE_SHIFT, 3457 area->vm_end - area->vm_start, area->vm_page_prot); 3458 } 3459 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3460 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3461 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3462 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3463 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3464 area, 3465 substream->runtime->dma_area, 3466 substream->runtime->dma_addr, 3467 substream->runtime->dma_bytes); 3468 #endif /* CONFIG_X86 */ 3469 /* mmap with fault handler */ 3470 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3471 return 0; 3472 } 3473 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3474 3475 /* 3476 * mmap the DMA buffer on I/O memory area 3477 */ 3478 #if SNDRV_PCM_INFO_MMAP_IOMEM 3479 /** 3480 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3481 * @substream: PCM substream 3482 * @area: VMA 3483 * 3484 * When your hardware uses the iomapped pages as the hardware buffer and 3485 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3486 * is supposed to work only on limited architectures. 3487 */ 3488 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3489 struct vm_area_struct *area) 3490 { 3491 struct snd_pcm_runtime *runtime = substream->runtime; 3492 3493 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3494 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3495 } 3496 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3497 #endif /* SNDRV_PCM_INFO_MMAP */ 3498 3499 /* 3500 * mmap DMA buffer 3501 */ 3502 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3503 struct vm_area_struct *area) 3504 { 3505 struct snd_pcm_runtime *runtime; 3506 long size; 3507 unsigned long offset; 3508 size_t dma_bytes; 3509 int err; 3510 3511 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3512 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3513 return -EINVAL; 3514 } else { 3515 if (!(area->vm_flags & VM_READ)) 3516 return -EINVAL; 3517 } 3518 runtime = substream->runtime; 3519 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3520 return -EBADFD; 3521 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3522 return -ENXIO; 3523 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3524 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3525 return -EINVAL; 3526 size = area->vm_end - area->vm_start; 3527 offset = area->vm_pgoff << PAGE_SHIFT; 3528 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3529 if ((size_t)size > dma_bytes) 3530 return -EINVAL; 3531 if (offset > dma_bytes - size) 3532 return -EINVAL; 3533 3534 area->vm_ops = &snd_pcm_vm_ops_data; 3535 area->vm_private_data = substream; 3536 if (substream->ops->mmap) 3537 err = substream->ops->mmap(substream, area); 3538 else 3539 err = snd_pcm_lib_default_mmap(substream, area); 3540 if (!err) 3541 atomic_inc(&substream->mmap_count); 3542 return err; 3543 } 3544 EXPORT_SYMBOL(snd_pcm_mmap_data); 3545 3546 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3547 { 3548 struct snd_pcm_file * pcm_file; 3549 struct snd_pcm_substream *substream; 3550 unsigned long offset; 3551 3552 pcm_file = file->private_data; 3553 substream = pcm_file->substream; 3554 if (PCM_RUNTIME_CHECK(substream)) 3555 return -ENXIO; 3556 3557 offset = area->vm_pgoff << PAGE_SHIFT; 3558 switch (offset) { 3559 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3560 if (!pcm_status_mmap_allowed(pcm_file)) 3561 return -ENXIO; 3562 return snd_pcm_mmap_status(substream, file, area); 3563 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3564 if (!pcm_control_mmap_allowed(pcm_file)) 3565 return -ENXIO; 3566 return snd_pcm_mmap_control(substream, file, area); 3567 default: 3568 return snd_pcm_mmap_data(substream, file, area); 3569 } 3570 return 0; 3571 } 3572 3573 static int snd_pcm_fasync(int fd, struct file * file, int on) 3574 { 3575 struct snd_pcm_file * pcm_file; 3576 struct snd_pcm_substream *substream; 3577 struct snd_pcm_runtime *runtime; 3578 3579 pcm_file = file->private_data; 3580 substream = pcm_file->substream; 3581 if (PCM_RUNTIME_CHECK(substream)) 3582 return -ENXIO; 3583 runtime = substream->runtime; 3584 return fasync_helper(fd, file, on, &runtime->fasync); 3585 } 3586 3587 /* 3588 * ioctl32 compat 3589 */ 3590 #ifdef CONFIG_COMPAT 3591 #include "pcm_compat.c" 3592 #else 3593 #define snd_pcm_ioctl_compat NULL 3594 #endif 3595 3596 /* 3597 * To be removed helpers to keep binary compatibility 3598 */ 3599 3600 #ifdef CONFIG_SND_SUPPORT_OLD_API 3601 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3602 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3603 3604 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3605 struct snd_pcm_hw_params_old *oparams) 3606 { 3607 unsigned int i; 3608 3609 memset(params, 0, sizeof(*params)); 3610 params->flags = oparams->flags; 3611 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3612 params->masks[i].bits[0] = oparams->masks[i]; 3613 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3614 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3615 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3616 params->info = oparams->info; 3617 params->msbits = oparams->msbits; 3618 params->rate_num = oparams->rate_num; 3619 params->rate_den = oparams->rate_den; 3620 params->fifo_size = oparams->fifo_size; 3621 } 3622 3623 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3624 struct snd_pcm_hw_params *params) 3625 { 3626 unsigned int i; 3627 3628 memset(oparams, 0, sizeof(*oparams)); 3629 oparams->flags = params->flags; 3630 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3631 oparams->masks[i] = params->masks[i].bits[0]; 3632 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3633 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3634 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3635 oparams->info = params->info; 3636 oparams->msbits = params->msbits; 3637 oparams->rate_num = params->rate_num; 3638 oparams->rate_den = params->rate_den; 3639 oparams->fifo_size = params->fifo_size; 3640 } 3641 3642 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3643 struct snd_pcm_hw_params_old __user * _oparams) 3644 { 3645 struct snd_pcm_hw_params *params; 3646 struct snd_pcm_hw_params_old *oparams = NULL; 3647 int err; 3648 3649 params = kmalloc(sizeof(*params), GFP_KERNEL); 3650 if (!params) 3651 return -ENOMEM; 3652 3653 oparams = memdup_user(_oparams, sizeof(*oparams)); 3654 if (IS_ERR(oparams)) { 3655 err = PTR_ERR(oparams); 3656 goto out; 3657 } 3658 snd_pcm_hw_convert_from_old_params(params, oparams); 3659 err = snd_pcm_hw_refine(substream, params); 3660 if (err < 0) 3661 goto out_old; 3662 3663 err = fixup_unreferenced_params(substream, params); 3664 if (err < 0) 3665 goto out_old; 3666 3667 snd_pcm_hw_convert_to_old_params(oparams, params); 3668 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3669 err = -EFAULT; 3670 out_old: 3671 kfree(oparams); 3672 out: 3673 kfree(params); 3674 return err; 3675 } 3676 3677 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3678 struct snd_pcm_hw_params_old __user * _oparams) 3679 { 3680 struct snd_pcm_hw_params *params; 3681 struct snd_pcm_hw_params_old *oparams = NULL; 3682 int err; 3683 3684 params = kmalloc(sizeof(*params), GFP_KERNEL); 3685 if (!params) 3686 return -ENOMEM; 3687 3688 oparams = memdup_user(_oparams, sizeof(*oparams)); 3689 if (IS_ERR(oparams)) { 3690 err = PTR_ERR(oparams); 3691 goto out; 3692 } 3693 3694 snd_pcm_hw_convert_from_old_params(params, oparams); 3695 err = snd_pcm_hw_params(substream, params); 3696 if (err < 0) 3697 goto out_old; 3698 3699 snd_pcm_hw_convert_to_old_params(oparams, params); 3700 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3701 err = -EFAULT; 3702 out_old: 3703 kfree(oparams); 3704 out: 3705 kfree(params); 3706 return err; 3707 } 3708 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3709 3710 #ifndef CONFIG_MMU 3711 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3712 unsigned long addr, 3713 unsigned long len, 3714 unsigned long pgoff, 3715 unsigned long flags) 3716 { 3717 struct snd_pcm_file *pcm_file = file->private_data; 3718 struct snd_pcm_substream *substream = pcm_file->substream; 3719 struct snd_pcm_runtime *runtime = substream->runtime; 3720 unsigned long offset = pgoff << PAGE_SHIFT; 3721 3722 switch (offset) { 3723 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3724 return (unsigned long)runtime->status; 3725 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3726 return (unsigned long)runtime->control; 3727 default: 3728 return (unsigned long)runtime->dma_area + offset; 3729 } 3730 } 3731 #else 3732 # define snd_pcm_get_unmapped_area NULL 3733 #endif 3734 3735 /* 3736 * Register section 3737 */ 3738 3739 const struct file_operations snd_pcm_f_ops[2] = { 3740 { 3741 .owner = THIS_MODULE, 3742 .write = snd_pcm_write, 3743 .write_iter = snd_pcm_writev, 3744 .open = snd_pcm_playback_open, 3745 .release = snd_pcm_release, 3746 .llseek = no_llseek, 3747 .poll = snd_pcm_poll, 3748 .unlocked_ioctl = snd_pcm_ioctl, 3749 .compat_ioctl = snd_pcm_ioctl_compat, 3750 .mmap = snd_pcm_mmap, 3751 .fasync = snd_pcm_fasync, 3752 .get_unmapped_area = snd_pcm_get_unmapped_area, 3753 }, 3754 { 3755 .owner = THIS_MODULE, 3756 .read = snd_pcm_read, 3757 .read_iter = snd_pcm_readv, 3758 .open = snd_pcm_capture_open, 3759 .release = snd_pcm_release, 3760 .llseek = no_llseek, 3761 .poll = snd_pcm_poll, 3762 .unlocked_ioctl = snd_pcm_ioctl, 3763 .compat_ioctl = snd_pcm_ioctl_compat, 3764 .mmap = snd_pcm_mmap, 3765 .fasync = snd_pcm_fasync, 3766 .get_unmapped_area = snd_pcm_get_unmapped_area, 3767 } 3768 }; 3769