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 40 #include "pcm_local.h" 41 42 #ifdef CONFIG_SND_DEBUG 43 #define CREATE_TRACE_POINTS 44 #include "pcm_param_trace.h" 45 #else 46 #define trace_hw_mask_param_enabled() 0 47 #define trace_hw_interval_param_enabled() 0 48 #define trace_hw_mask_param(substream, type, index, prev, curr) 49 #define trace_hw_interval_param(substream, type, index, prev, curr) 50 #endif 51 52 /* 53 * Compatibility 54 */ 55 56 struct snd_pcm_hw_params_old { 57 unsigned int flags; 58 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 59 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 60 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 61 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 62 unsigned int rmask; 63 unsigned int cmask; 64 unsigned int info; 65 unsigned int msbits; 66 unsigned int rate_num; 67 unsigned int rate_den; 68 snd_pcm_uframes_t fifo_size; 69 unsigned char reserved[64]; 70 }; 71 72 #ifdef CONFIG_SND_SUPPORT_OLD_API 73 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 74 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 75 76 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 77 struct snd_pcm_hw_params_old __user * _oparams); 78 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 79 struct snd_pcm_hw_params_old __user * _oparams); 80 #endif 81 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 82 83 /* 84 * 85 */ 86 87 static DEFINE_RWLOCK(snd_pcm_link_rwlock); 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 * spin until it gets the lock. 95 */ 96 static inline void down_write_nonblock(struct rw_semaphore *lock) 97 { 98 while (!down_write_trylock(lock)) 99 cond_resched(); 100 } 101 102 /** 103 * snd_pcm_stream_lock - Lock the PCM stream 104 * @substream: PCM substream 105 * 106 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 107 * flag of the given substream. This also takes the global link rw lock 108 * (or rw sem), too, for avoiding the race with linked streams. 109 */ 110 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 111 { 112 if (substream->pcm->nonatomic) { 113 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING); 114 mutex_lock(&substream->self_group.mutex); 115 } else { 116 read_lock(&snd_pcm_link_rwlock); 117 spin_lock(&substream->self_group.lock); 118 } 119 } 120 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 121 122 /** 123 * snd_pcm_stream_lock - Unlock the PCM stream 124 * @substream: PCM substream 125 * 126 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 127 */ 128 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 129 { 130 if (substream->pcm->nonatomic) { 131 mutex_unlock(&substream->self_group.mutex); 132 up_read(&snd_pcm_link_rwsem); 133 } else { 134 spin_unlock(&substream->self_group.lock); 135 read_unlock(&snd_pcm_link_rwlock); 136 } 137 } 138 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 139 140 /** 141 * snd_pcm_stream_lock_irq - Lock the PCM stream 142 * @substream: PCM substream 143 * 144 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 145 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 146 * as snd_pcm_stream_lock(). 147 */ 148 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 149 { 150 if (!substream->pcm->nonatomic) 151 local_irq_disable(); 152 snd_pcm_stream_lock(substream); 153 } 154 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 155 156 /** 157 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 158 * @substream: PCM substream 159 * 160 * This is a counter-part of snd_pcm_stream_lock_irq(). 161 */ 162 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 163 { 164 snd_pcm_stream_unlock(substream); 165 if (!substream->pcm->nonatomic) 166 local_irq_enable(); 167 } 168 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 169 170 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 171 { 172 unsigned long flags = 0; 173 if (!substream->pcm->nonatomic) 174 local_irq_save(flags); 175 snd_pcm_stream_lock(substream); 176 return flags; 177 } 178 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 179 180 /** 181 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 182 * @substream: PCM substream 183 * @flags: irq flags 184 * 185 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 186 */ 187 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 188 unsigned long flags) 189 { 190 snd_pcm_stream_unlock(substream); 191 if (!substream->pcm->nonatomic) 192 local_irq_restore(flags); 193 } 194 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 195 196 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 197 { 198 struct snd_pcm_runtime *runtime; 199 struct snd_pcm *pcm = substream->pcm; 200 struct snd_pcm_str *pstr = substream->pstr; 201 202 memset(info, 0, sizeof(*info)); 203 info->card = pcm->card->number; 204 info->device = pcm->device; 205 info->stream = substream->stream; 206 info->subdevice = substream->number; 207 strlcpy(info->id, pcm->id, sizeof(info->id)); 208 strlcpy(info->name, pcm->name, sizeof(info->name)); 209 info->dev_class = pcm->dev_class; 210 info->dev_subclass = pcm->dev_subclass; 211 info->subdevices_count = pstr->substream_count; 212 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 213 strlcpy(info->subname, substream->name, sizeof(info->subname)); 214 runtime = substream->runtime; 215 /* AB: FIXME!!! This is definitely nonsense */ 216 if (runtime) { 217 info->sync = runtime->sync; 218 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info); 219 } 220 return 0; 221 } 222 223 int snd_pcm_info_user(struct snd_pcm_substream *substream, 224 struct snd_pcm_info __user * _info) 225 { 226 struct snd_pcm_info *info; 227 int err; 228 229 info = kmalloc(sizeof(*info), GFP_KERNEL); 230 if (! info) 231 return -ENOMEM; 232 err = snd_pcm_info(substream, info); 233 if (err >= 0) { 234 if (copy_to_user(_info, info, sizeof(*info))) 235 err = -EFAULT; 236 } 237 kfree(info); 238 return err; 239 } 240 241 static bool hw_support_mmap(struct snd_pcm_substream *substream) 242 { 243 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 244 return false; 245 /* check architectures that return -EINVAL from dma_mmap_coherent() */ 246 /* FIXME: this should be some global flag */ 247 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\ 248 defined(CONFIG_PARISC) || defined(CONFIG_XTENSA) 249 if (!substream->ops->mmap && 250 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 251 return false; 252 #endif 253 return true; 254 } 255 256 static int constrain_mask_params(struct snd_pcm_substream *substream, 257 struct snd_pcm_hw_params *params) 258 { 259 struct snd_pcm_hw_constraints *constrs = 260 &substream->runtime->hw_constraints; 261 struct snd_mask *m; 262 unsigned int k; 263 struct snd_mask old_mask; 264 int changed; 265 266 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 267 m = hw_param_mask(params, k); 268 if (snd_mask_empty(m)) 269 return -EINVAL; 270 271 /* This parameter is not requested to change by a caller. */ 272 if (!(params->rmask & (1 << k))) 273 continue; 274 275 if (trace_hw_mask_param_enabled()) 276 old_mask = *m; 277 278 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 279 if (changed < 0) 280 return changed; 281 if (changed == 0) 282 continue; 283 284 /* Set corresponding flag so that the caller gets it. */ 285 trace_hw_mask_param(substream, k, 0, &old_mask, m); 286 params->cmask |= 1 << k; 287 } 288 289 return 0; 290 } 291 292 static int constrain_interval_params(struct snd_pcm_substream *substream, 293 struct snd_pcm_hw_params *params) 294 { 295 struct snd_pcm_hw_constraints *constrs = 296 &substream->runtime->hw_constraints; 297 struct snd_interval *i; 298 unsigned int k; 299 struct snd_interval old_interval; 300 int changed; 301 302 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 303 i = hw_param_interval(params, k); 304 if (snd_interval_empty(i)) 305 return -EINVAL; 306 307 /* This parameter is not requested to change by a caller. */ 308 if (!(params->rmask & (1 << k))) 309 continue; 310 311 if (trace_hw_interval_param_enabled()) 312 old_interval = *i; 313 314 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 315 if (changed < 0) 316 return changed; 317 if (changed == 0) 318 continue; 319 320 /* Set corresponding flag so that the caller gets it. */ 321 trace_hw_interval_param(substream, k, 0, &old_interval, i); 322 params->cmask |= 1 << k; 323 } 324 325 return 0; 326 } 327 328 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 329 struct snd_pcm_hw_params *params) 330 { 331 struct snd_pcm_hw_constraints *constrs = 332 &substream->runtime->hw_constraints; 333 unsigned int k; 334 unsigned int rstamps[constrs->rules_num]; 335 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 336 unsigned int stamp; 337 struct snd_pcm_hw_rule *r; 338 unsigned int d; 339 struct snd_mask old_mask; 340 struct snd_interval old_interval; 341 bool again; 342 int changed; 343 344 /* 345 * Each application of rule has own sequence number. 346 * 347 * Each member of 'rstamps' array represents the sequence number of 348 * recent application of corresponding rule. 349 */ 350 for (k = 0; k < constrs->rules_num; k++) 351 rstamps[k] = 0; 352 353 /* 354 * Each member of 'vstamps' array represents the sequence number of 355 * recent application of rule in which corresponding parameters were 356 * changed. 357 * 358 * In initial state, elements corresponding to parameters requested by 359 * a caller is 1. For unrequested parameters, corresponding members 360 * have 0 so that the parameters are never changed anymore. 361 */ 362 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 363 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 364 365 /* Due to the above design, actual sequence number starts at 2. */ 366 stamp = 2; 367 retry: 368 /* Apply all rules in order. */ 369 again = false; 370 for (k = 0; k < constrs->rules_num; k++) { 371 r = &constrs->rules[k]; 372 373 /* 374 * Check condition bits of this rule. When the rule has 375 * some condition bits, parameter without the bits is 376 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 377 * is an example of the condition bits. 378 */ 379 if (r->cond && !(r->cond & params->flags)) 380 continue; 381 382 /* 383 * The 'deps' array includes maximum three dependencies 384 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 385 * member of this array is a sentinel and should be 386 * negative value. 387 * 388 * This rule should be processed in this time when dependent 389 * parameters were changed at former applications of the other 390 * rules. 391 */ 392 for (d = 0; r->deps[d] >= 0; d++) { 393 if (vstamps[r->deps[d]] > rstamps[k]) 394 break; 395 } 396 if (r->deps[d] < 0) 397 continue; 398 399 if (trace_hw_mask_param_enabled()) { 400 if (hw_is_mask(r->var)) 401 old_mask = *hw_param_mask(params, r->var); 402 } 403 if (trace_hw_interval_param_enabled()) { 404 if (hw_is_interval(r->var)) 405 old_interval = *hw_param_interval(params, r->var); 406 } 407 408 changed = r->func(params, r); 409 if (changed < 0) 410 return changed; 411 412 /* 413 * When the parameter is changed, notify it to the caller 414 * by corresponding returned bit, then preparing for next 415 * iteration. 416 */ 417 if (changed && r->var >= 0) { 418 if (hw_is_mask(r->var)) { 419 trace_hw_mask_param(substream, r->var, 420 k + 1, &old_mask, 421 hw_param_mask(params, r->var)); 422 } 423 if (hw_is_interval(r->var)) { 424 trace_hw_interval_param(substream, r->var, 425 k + 1, &old_interval, 426 hw_param_interval(params, r->var)); 427 } 428 429 params->cmask |= (1 << r->var); 430 vstamps[r->var] = stamp; 431 again = true; 432 } 433 434 rstamps[k] = stamp++; 435 } 436 437 /* Iterate to evaluate all rules till no parameters are changed. */ 438 if (again) 439 goto retry; 440 441 return 0; 442 } 443 444 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 445 struct snd_pcm_hw_params *params) 446 { 447 const struct snd_interval *i; 448 const struct snd_mask *m; 449 int err; 450 451 if (!params->msbits) { 452 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 453 if (snd_interval_single(i)) 454 params->msbits = snd_interval_value(i); 455 } 456 457 if (!params->rate_den) { 458 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 459 if (snd_interval_single(i)) { 460 params->rate_num = snd_interval_value(i); 461 params->rate_den = 1; 462 } 463 } 464 465 if (!params->fifo_size) { 466 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 467 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 468 if (snd_mask_single(m) && snd_interval_single(i)) { 469 err = substream->ops->ioctl(substream, 470 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 471 if (err < 0) 472 return err; 473 } 474 } 475 476 if (!params->info) { 477 params->info = substream->runtime->hw.info; 478 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 479 SNDRV_PCM_INFO_DRAIN_TRIGGER); 480 if (!hw_support_mmap(substream)) 481 params->info &= ~(SNDRV_PCM_INFO_MMAP | 482 SNDRV_PCM_INFO_MMAP_VALID); 483 } 484 485 return 0; 486 } 487 488 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 489 struct snd_pcm_hw_params *params) 490 { 491 int err; 492 493 params->info = 0; 494 params->fifo_size = 0; 495 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 496 params->msbits = 0; 497 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 498 params->rate_num = 0; 499 params->rate_den = 0; 500 } 501 502 err = constrain_mask_params(substream, params); 503 if (err < 0) 504 return err; 505 506 err = constrain_interval_params(substream, params); 507 if (err < 0) 508 return err; 509 510 err = constrain_params_by_rules(substream, params); 511 if (err < 0) 512 return err; 513 514 params->rmask = 0; 515 516 return 0; 517 } 518 EXPORT_SYMBOL(snd_pcm_hw_refine); 519 520 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 521 struct snd_pcm_hw_params __user * _params) 522 { 523 struct snd_pcm_hw_params *params; 524 int err; 525 526 params = memdup_user(_params, sizeof(*params)); 527 if (IS_ERR(params)) 528 return PTR_ERR(params); 529 530 err = snd_pcm_hw_refine(substream, params); 531 if (err < 0) 532 goto end; 533 534 err = fixup_unreferenced_params(substream, params); 535 if (err < 0) 536 goto end; 537 538 if (copy_to_user(_params, params, sizeof(*params))) 539 err = -EFAULT; 540 end: 541 kfree(params); 542 return err; 543 } 544 545 static int period_to_usecs(struct snd_pcm_runtime *runtime) 546 { 547 int usecs; 548 549 if (! runtime->rate) 550 return -1; /* invalid */ 551 552 /* take 75% of period time as the deadline */ 553 usecs = (750000 / runtime->rate) * runtime->period_size; 554 usecs += ((750000 % runtime->rate) * runtime->period_size) / 555 runtime->rate; 556 557 return usecs; 558 } 559 560 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 561 { 562 snd_pcm_stream_lock_irq(substream); 563 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 564 substream->runtime->status->state = state; 565 snd_pcm_stream_unlock_irq(substream); 566 } 567 568 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 569 int event) 570 { 571 #ifdef CONFIG_SND_PCM_TIMER 572 if (substream->timer) 573 snd_timer_notify(substream->timer, event, 574 &substream->runtime->trigger_tstamp); 575 #endif 576 } 577 578 /** 579 * snd_pcm_hw_param_choose - choose a configuration defined by @params 580 * @pcm: PCM instance 581 * @params: the hw_params instance 582 * 583 * Choose one configuration from configuration space defined by @params. 584 * The configuration chosen is that obtained fixing in this order: 585 * first access, first format, first subformat, min channels, 586 * min rate, min period time, max buffer size, min tick time 587 * 588 * Return: Zero if successful, or a negative error code on failure. 589 */ 590 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 591 struct snd_pcm_hw_params *params) 592 { 593 static const int vars[] = { 594 SNDRV_PCM_HW_PARAM_ACCESS, 595 SNDRV_PCM_HW_PARAM_FORMAT, 596 SNDRV_PCM_HW_PARAM_SUBFORMAT, 597 SNDRV_PCM_HW_PARAM_CHANNELS, 598 SNDRV_PCM_HW_PARAM_RATE, 599 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 600 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 601 SNDRV_PCM_HW_PARAM_TICK_TIME, 602 -1 603 }; 604 const int *v; 605 struct snd_mask old_mask; 606 struct snd_interval old_interval; 607 int changed; 608 609 for (v = vars; *v != -1; v++) { 610 /* Keep old parameter to trace. */ 611 if (trace_hw_mask_param_enabled()) { 612 if (hw_is_mask(*v)) 613 old_mask = *hw_param_mask(params, *v); 614 } 615 if (trace_hw_interval_param_enabled()) { 616 if (hw_is_interval(*v)) 617 old_interval = *hw_param_interval(params, *v); 618 } 619 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 620 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 621 else 622 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 623 if (snd_BUG_ON(changed < 0)) 624 return changed; 625 if (changed == 0) 626 continue; 627 628 /* Trace the changed parameter. */ 629 if (hw_is_mask(*v)) { 630 trace_hw_mask_param(pcm, *v, 0, &old_mask, 631 hw_param_mask(params, *v)); 632 } 633 if (hw_is_interval(*v)) { 634 trace_hw_interval_param(pcm, *v, 0, &old_interval, 635 hw_param_interval(params, *v)); 636 } 637 } 638 639 return 0; 640 } 641 642 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 643 struct snd_pcm_hw_params *params) 644 { 645 struct snd_pcm_runtime *runtime; 646 int err, usecs; 647 unsigned int bits; 648 snd_pcm_uframes_t frames; 649 650 if (PCM_RUNTIME_CHECK(substream)) 651 return -ENXIO; 652 runtime = substream->runtime; 653 snd_pcm_stream_lock_irq(substream); 654 switch (runtime->status->state) { 655 case SNDRV_PCM_STATE_OPEN: 656 case SNDRV_PCM_STATE_SETUP: 657 case SNDRV_PCM_STATE_PREPARED: 658 break; 659 default: 660 snd_pcm_stream_unlock_irq(substream); 661 return -EBADFD; 662 } 663 snd_pcm_stream_unlock_irq(substream); 664 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 665 if (!substream->oss.oss) 666 #endif 667 if (atomic_read(&substream->mmap_count)) 668 return -EBADFD; 669 670 params->rmask = ~0U; 671 err = snd_pcm_hw_refine(substream, params); 672 if (err < 0) 673 goto _error; 674 675 err = snd_pcm_hw_params_choose(substream, params); 676 if (err < 0) 677 goto _error; 678 679 err = fixup_unreferenced_params(substream, params); 680 if (err < 0) 681 goto _error; 682 683 if (substream->ops->hw_params != NULL) { 684 err = substream->ops->hw_params(substream, params); 685 if (err < 0) 686 goto _error; 687 } 688 689 runtime->access = params_access(params); 690 runtime->format = params_format(params); 691 runtime->subformat = params_subformat(params); 692 runtime->channels = params_channels(params); 693 runtime->rate = params_rate(params); 694 runtime->period_size = params_period_size(params); 695 runtime->periods = params_periods(params); 696 runtime->buffer_size = params_buffer_size(params); 697 runtime->info = params->info; 698 runtime->rate_num = params->rate_num; 699 runtime->rate_den = params->rate_den; 700 runtime->no_period_wakeup = 701 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 702 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 703 704 bits = snd_pcm_format_physical_width(runtime->format); 705 runtime->sample_bits = bits; 706 bits *= runtime->channels; 707 runtime->frame_bits = bits; 708 frames = 1; 709 while (bits % 8 != 0) { 710 bits *= 2; 711 frames *= 2; 712 } 713 runtime->byte_align = bits / 8; 714 runtime->min_align = frames; 715 716 /* Default sw params */ 717 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 718 runtime->period_step = 1; 719 runtime->control->avail_min = runtime->period_size; 720 runtime->start_threshold = 1; 721 runtime->stop_threshold = runtime->buffer_size; 722 runtime->silence_threshold = 0; 723 runtime->silence_size = 0; 724 runtime->boundary = runtime->buffer_size; 725 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 726 runtime->boundary *= 2; 727 728 snd_pcm_timer_resolution_change(substream); 729 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 730 731 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 732 pm_qos_remove_request(&substream->latency_pm_qos_req); 733 if ((usecs = period_to_usecs(runtime)) >= 0) 734 pm_qos_add_request(&substream->latency_pm_qos_req, 735 PM_QOS_CPU_DMA_LATENCY, usecs); 736 return 0; 737 _error: 738 /* hardware might be unusable from this time, 739 so we force application to retry to set 740 the correct hardware parameter settings */ 741 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 742 if (substream->ops->hw_free != NULL) 743 substream->ops->hw_free(substream); 744 return err; 745 } 746 747 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 748 struct snd_pcm_hw_params __user * _params) 749 { 750 struct snd_pcm_hw_params *params; 751 int err; 752 753 params = memdup_user(_params, sizeof(*params)); 754 if (IS_ERR(params)) 755 return PTR_ERR(params); 756 757 err = snd_pcm_hw_params(substream, params); 758 if (err < 0) 759 goto end; 760 761 if (copy_to_user(_params, params, sizeof(*params))) 762 err = -EFAULT; 763 end: 764 kfree(params); 765 return err; 766 } 767 768 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 769 { 770 struct snd_pcm_runtime *runtime; 771 int result = 0; 772 773 if (PCM_RUNTIME_CHECK(substream)) 774 return -ENXIO; 775 runtime = substream->runtime; 776 snd_pcm_stream_lock_irq(substream); 777 switch (runtime->status->state) { 778 case SNDRV_PCM_STATE_SETUP: 779 case SNDRV_PCM_STATE_PREPARED: 780 break; 781 default: 782 snd_pcm_stream_unlock_irq(substream); 783 return -EBADFD; 784 } 785 snd_pcm_stream_unlock_irq(substream); 786 if (atomic_read(&substream->mmap_count)) 787 return -EBADFD; 788 if (substream->ops->hw_free) 789 result = substream->ops->hw_free(substream); 790 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 791 pm_qos_remove_request(&substream->latency_pm_qos_req); 792 return result; 793 } 794 795 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 796 struct snd_pcm_sw_params *params) 797 { 798 struct snd_pcm_runtime *runtime; 799 int err; 800 801 if (PCM_RUNTIME_CHECK(substream)) 802 return -ENXIO; 803 runtime = substream->runtime; 804 snd_pcm_stream_lock_irq(substream); 805 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 806 snd_pcm_stream_unlock_irq(substream); 807 return -EBADFD; 808 } 809 snd_pcm_stream_unlock_irq(substream); 810 811 if (params->tstamp_mode < 0 || 812 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 813 return -EINVAL; 814 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 815 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 816 return -EINVAL; 817 if (params->avail_min == 0) 818 return -EINVAL; 819 if (params->silence_size >= runtime->boundary) { 820 if (params->silence_threshold != 0) 821 return -EINVAL; 822 } else { 823 if (params->silence_size > params->silence_threshold) 824 return -EINVAL; 825 if (params->silence_threshold > runtime->buffer_size) 826 return -EINVAL; 827 } 828 err = 0; 829 snd_pcm_stream_lock_irq(substream); 830 runtime->tstamp_mode = params->tstamp_mode; 831 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 832 runtime->tstamp_type = params->tstamp_type; 833 runtime->period_step = params->period_step; 834 runtime->control->avail_min = params->avail_min; 835 runtime->start_threshold = params->start_threshold; 836 runtime->stop_threshold = params->stop_threshold; 837 runtime->silence_threshold = params->silence_threshold; 838 runtime->silence_size = params->silence_size; 839 params->boundary = runtime->boundary; 840 if (snd_pcm_running(substream)) { 841 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 842 runtime->silence_size > 0) 843 snd_pcm_playback_silence(substream, ULONG_MAX); 844 err = snd_pcm_update_state(substream, runtime); 845 } 846 snd_pcm_stream_unlock_irq(substream); 847 return err; 848 } 849 850 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 851 struct snd_pcm_sw_params __user * _params) 852 { 853 struct snd_pcm_sw_params params; 854 int err; 855 if (copy_from_user(¶ms, _params, sizeof(params))) 856 return -EFAULT; 857 err = snd_pcm_sw_params(substream, ¶ms); 858 if (copy_to_user(_params, ¶ms, sizeof(params))) 859 return -EFAULT; 860 return err; 861 } 862 863 int snd_pcm_status(struct snd_pcm_substream *substream, 864 struct snd_pcm_status *status) 865 { 866 struct snd_pcm_runtime *runtime = substream->runtime; 867 868 snd_pcm_stream_lock_irq(substream); 869 870 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 871 &runtime->audio_tstamp_config); 872 873 /* backwards compatible behavior */ 874 if (runtime->audio_tstamp_config.type_requested == 875 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 876 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 877 runtime->audio_tstamp_config.type_requested = 878 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 879 else 880 runtime->audio_tstamp_config.type_requested = 881 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 882 runtime->audio_tstamp_report.valid = 0; 883 } else 884 runtime->audio_tstamp_report.valid = 1; 885 886 status->state = runtime->status->state; 887 status->suspended_state = runtime->status->suspended_state; 888 if (status->state == SNDRV_PCM_STATE_OPEN) 889 goto _end; 890 status->trigger_tstamp = runtime->trigger_tstamp; 891 if (snd_pcm_running(substream)) { 892 snd_pcm_update_hw_ptr(substream); 893 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 894 status->tstamp = runtime->status->tstamp; 895 status->driver_tstamp = runtime->driver_tstamp; 896 status->audio_tstamp = 897 runtime->status->audio_tstamp; 898 if (runtime->audio_tstamp_report.valid == 1) 899 /* backwards compatibility, no report provided in COMPAT mode */ 900 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 901 &status->audio_tstamp_accuracy, 902 &runtime->audio_tstamp_report); 903 904 goto _tstamp_end; 905 } 906 } else { 907 /* get tstamp only in fallback mode and only if enabled */ 908 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 909 snd_pcm_gettime(runtime, &status->tstamp); 910 } 911 _tstamp_end: 912 status->appl_ptr = runtime->control->appl_ptr; 913 status->hw_ptr = runtime->status->hw_ptr; 914 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 915 status->avail = snd_pcm_playback_avail(runtime); 916 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 917 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 918 status->delay = runtime->buffer_size - status->avail; 919 status->delay += runtime->delay; 920 } else 921 status->delay = 0; 922 } else { 923 status->avail = snd_pcm_capture_avail(runtime); 924 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 925 status->delay = status->avail + runtime->delay; 926 else 927 status->delay = 0; 928 } 929 status->avail_max = runtime->avail_max; 930 status->overrange = runtime->overrange; 931 runtime->avail_max = 0; 932 runtime->overrange = 0; 933 _end: 934 snd_pcm_stream_unlock_irq(substream); 935 return 0; 936 } 937 938 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 939 struct snd_pcm_status __user * _status, 940 bool ext) 941 { 942 struct snd_pcm_status status; 943 int res; 944 945 memset(&status, 0, sizeof(status)); 946 /* 947 * with extension, parameters are read/write, 948 * get audio_tstamp_data from user, 949 * ignore rest of status structure 950 */ 951 if (ext && get_user(status.audio_tstamp_data, 952 (u32 __user *)(&_status->audio_tstamp_data))) 953 return -EFAULT; 954 res = snd_pcm_status(substream, &status); 955 if (res < 0) 956 return res; 957 if (copy_to_user(_status, &status, sizeof(status))) 958 return -EFAULT; 959 return 0; 960 } 961 962 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 963 struct snd_pcm_channel_info * info) 964 { 965 struct snd_pcm_runtime *runtime; 966 unsigned int channel; 967 968 channel = info->channel; 969 runtime = substream->runtime; 970 snd_pcm_stream_lock_irq(substream); 971 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 972 snd_pcm_stream_unlock_irq(substream); 973 return -EBADFD; 974 } 975 snd_pcm_stream_unlock_irq(substream); 976 if (channel >= runtime->channels) 977 return -EINVAL; 978 memset(info, 0, sizeof(*info)); 979 info->channel = channel; 980 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 981 } 982 983 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 984 struct snd_pcm_channel_info __user * _info) 985 { 986 struct snd_pcm_channel_info info; 987 int res; 988 989 if (copy_from_user(&info, _info, sizeof(info))) 990 return -EFAULT; 991 res = snd_pcm_channel_info(substream, &info); 992 if (res < 0) 993 return res; 994 if (copy_to_user(_info, &info, sizeof(info))) 995 return -EFAULT; 996 return 0; 997 } 998 999 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 1000 { 1001 struct snd_pcm_runtime *runtime = substream->runtime; 1002 if (runtime->trigger_master == NULL) 1003 return; 1004 if (runtime->trigger_master == substream) { 1005 if (!runtime->trigger_tstamp_latched) 1006 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1007 } else { 1008 snd_pcm_trigger_tstamp(runtime->trigger_master); 1009 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1010 } 1011 runtime->trigger_master = NULL; 1012 } 1013 1014 struct action_ops { 1015 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1016 int (*do_action)(struct snd_pcm_substream *substream, int state); 1017 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1018 void (*post_action)(struct snd_pcm_substream *substream, int state); 1019 }; 1020 1021 /* 1022 * this functions is core for handling of linked stream 1023 * Note: the stream state might be changed also on failure 1024 * Note2: call with calling stream lock + link lock 1025 */ 1026 static int snd_pcm_action_group(const struct action_ops *ops, 1027 struct snd_pcm_substream *substream, 1028 int state, int do_lock) 1029 { 1030 struct snd_pcm_substream *s = NULL; 1031 struct snd_pcm_substream *s1; 1032 int res = 0, depth = 1; 1033 1034 snd_pcm_group_for_each_entry(s, substream) { 1035 if (do_lock && s != substream) { 1036 if (s->pcm->nonatomic) 1037 mutex_lock_nested(&s->self_group.mutex, depth); 1038 else 1039 spin_lock_nested(&s->self_group.lock, depth); 1040 depth++; 1041 } 1042 res = ops->pre_action(s, state); 1043 if (res < 0) 1044 goto _unlock; 1045 } 1046 snd_pcm_group_for_each_entry(s, substream) { 1047 res = ops->do_action(s, state); 1048 if (res < 0) { 1049 if (ops->undo_action) { 1050 snd_pcm_group_for_each_entry(s1, substream) { 1051 if (s1 == s) /* failed stream */ 1052 break; 1053 ops->undo_action(s1, state); 1054 } 1055 } 1056 s = NULL; /* unlock all */ 1057 goto _unlock; 1058 } 1059 } 1060 snd_pcm_group_for_each_entry(s, substream) { 1061 ops->post_action(s, state); 1062 } 1063 _unlock: 1064 if (do_lock) { 1065 /* unlock streams */ 1066 snd_pcm_group_for_each_entry(s1, substream) { 1067 if (s1 != substream) { 1068 if (s1->pcm->nonatomic) 1069 mutex_unlock(&s1->self_group.mutex); 1070 else 1071 spin_unlock(&s1->self_group.lock); 1072 } 1073 if (s1 == s) /* end */ 1074 break; 1075 } 1076 } 1077 return res; 1078 } 1079 1080 /* 1081 * Note: call with stream lock 1082 */ 1083 static int snd_pcm_action_single(const struct action_ops *ops, 1084 struct snd_pcm_substream *substream, 1085 int state) 1086 { 1087 int res; 1088 1089 res = ops->pre_action(substream, state); 1090 if (res < 0) 1091 return res; 1092 res = ops->do_action(substream, state); 1093 if (res == 0) 1094 ops->post_action(substream, state); 1095 else if (ops->undo_action) 1096 ops->undo_action(substream, state); 1097 return res; 1098 } 1099 1100 /* 1101 * Note: call with stream lock 1102 */ 1103 static int snd_pcm_action(const struct action_ops *ops, 1104 struct snd_pcm_substream *substream, 1105 int state) 1106 { 1107 int res; 1108 1109 if (!snd_pcm_stream_linked(substream)) 1110 return snd_pcm_action_single(ops, substream, state); 1111 1112 if (substream->pcm->nonatomic) { 1113 if (!mutex_trylock(&substream->group->mutex)) { 1114 mutex_unlock(&substream->self_group.mutex); 1115 mutex_lock(&substream->group->mutex); 1116 mutex_lock(&substream->self_group.mutex); 1117 } 1118 res = snd_pcm_action_group(ops, substream, state, 1); 1119 mutex_unlock(&substream->group->mutex); 1120 } else { 1121 if (!spin_trylock(&substream->group->lock)) { 1122 spin_unlock(&substream->self_group.lock); 1123 spin_lock(&substream->group->lock); 1124 spin_lock(&substream->self_group.lock); 1125 } 1126 res = snd_pcm_action_group(ops, substream, state, 1); 1127 spin_unlock(&substream->group->lock); 1128 } 1129 return res; 1130 } 1131 1132 /* 1133 * Note: don't use any locks before 1134 */ 1135 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1136 struct snd_pcm_substream *substream, 1137 int state) 1138 { 1139 int res; 1140 1141 snd_pcm_stream_lock_irq(substream); 1142 res = snd_pcm_action(ops, substream, state); 1143 snd_pcm_stream_unlock_irq(substream); 1144 return res; 1145 } 1146 1147 /* 1148 */ 1149 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1150 struct snd_pcm_substream *substream, 1151 int state) 1152 { 1153 int res; 1154 1155 down_read(&snd_pcm_link_rwsem); 1156 if (snd_pcm_stream_linked(substream)) 1157 res = snd_pcm_action_group(ops, substream, state, 0); 1158 else 1159 res = snd_pcm_action_single(ops, substream, state); 1160 up_read(&snd_pcm_link_rwsem); 1161 return res; 1162 } 1163 1164 /* 1165 * start callbacks 1166 */ 1167 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1168 { 1169 struct snd_pcm_runtime *runtime = substream->runtime; 1170 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1171 return -EBADFD; 1172 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1173 !snd_pcm_playback_data(substream)) 1174 return -EPIPE; 1175 runtime->trigger_tstamp_latched = false; 1176 runtime->trigger_master = substream; 1177 return 0; 1178 } 1179 1180 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1181 { 1182 if (substream->runtime->trigger_master != substream) 1183 return 0; 1184 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1185 } 1186 1187 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1188 { 1189 if (substream->runtime->trigger_master == substream) 1190 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1191 } 1192 1193 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1194 { 1195 struct snd_pcm_runtime *runtime = substream->runtime; 1196 snd_pcm_trigger_tstamp(substream); 1197 runtime->hw_ptr_jiffies = jiffies; 1198 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1199 runtime->rate; 1200 runtime->status->state = state; 1201 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1202 runtime->silence_size > 0) 1203 snd_pcm_playback_silence(substream, ULONG_MAX); 1204 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1205 } 1206 1207 static const struct action_ops snd_pcm_action_start = { 1208 .pre_action = snd_pcm_pre_start, 1209 .do_action = snd_pcm_do_start, 1210 .undo_action = snd_pcm_undo_start, 1211 .post_action = snd_pcm_post_start 1212 }; 1213 1214 /** 1215 * snd_pcm_start - start all linked streams 1216 * @substream: the PCM substream instance 1217 * 1218 * Return: Zero if successful, or a negative error code. 1219 * The stream lock must be acquired before calling this function. 1220 */ 1221 int snd_pcm_start(struct snd_pcm_substream *substream) 1222 { 1223 return snd_pcm_action(&snd_pcm_action_start, substream, 1224 SNDRV_PCM_STATE_RUNNING); 1225 } 1226 1227 /* take the stream lock and start the streams */ 1228 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1229 { 1230 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1231 SNDRV_PCM_STATE_RUNNING); 1232 } 1233 1234 /* 1235 * stop callbacks 1236 */ 1237 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1238 { 1239 struct snd_pcm_runtime *runtime = substream->runtime; 1240 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1241 return -EBADFD; 1242 runtime->trigger_master = substream; 1243 return 0; 1244 } 1245 1246 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1247 { 1248 if (substream->runtime->trigger_master == substream && 1249 snd_pcm_running(substream)) 1250 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1251 return 0; /* unconditonally stop all substreams */ 1252 } 1253 1254 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1255 { 1256 struct snd_pcm_runtime *runtime = substream->runtime; 1257 if (runtime->status->state != state) { 1258 snd_pcm_trigger_tstamp(substream); 1259 runtime->status->state = state; 1260 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1261 } 1262 wake_up(&runtime->sleep); 1263 wake_up(&runtime->tsleep); 1264 } 1265 1266 static const struct action_ops snd_pcm_action_stop = { 1267 .pre_action = snd_pcm_pre_stop, 1268 .do_action = snd_pcm_do_stop, 1269 .post_action = snd_pcm_post_stop 1270 }; 1271 1272 /** 1273 * snd_pcm_stop - try to stop all running streams in the substream group 1274 * @substream: the PCM substream instance 1275 * @state: PCM state after stopping the stream 1276 * 1277 * The state of each stream is then changed to the given state unconditionally. 1278 * 1279 * Return: Zero if successful, or a negative error code. 1280 */ 1281 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1282 { 1283 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1284 } 1285 1286 EXPORT_SYMBOL(snd_pcm_stop); 1287 1288 /** 1289 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1290 * @substream: the PCM substream 1291 * 1292 * After stopping, the state is changed to SETUP. 1293 * Unlike snd_pcm_stop(), this affects only the given stream. 1294 * 1295 * Return: Zero if succesful, or a negative error code. 1296 */ 1297 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1298 { 1299 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1300 SNDRV_PCM_STATE_SETUP); 1301 } 1302 1303 /** 1304 * snd_pcm_stop_xrun - stop the running streams as XRUN 1305 * @substream: the PCM substream instance 1306 * 1307 * This stops the given running substream (and all linked substreams) as XRUN. 1308 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1309 * 1310 * Return: Zero if successful, or a negative error code. 1311 */ 1312 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1313 { 1314 unsigned long flags; 1315 int ret = 0; 1316 1317 snd_pcm_stream_lock_irqsave(substream, flags); 1318 if (snd_pcm_running(substream)) 1319 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1320 snd_pcm_stream_unlock_irqrestore(substream, flags); 1321 return ret; 1322 } 1323 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1324 1325 /* 1326 * pause callbacks 1327 */ 1328 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1329 { 1330 struct snd_pcm_runtime *runtime = substream->runtime; 1331 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1332 return -ENOSYS; 1333 if (push) { 1334 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1335 return -EBADFD; 1336 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1337 return -EBADFD; 1338 runtime->trigger_master = substream; 1339 return 0; 1340 } 1341 1342 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1343 { 1344 if (substream->runtime->trigger_master != substream) 1345 return 0; 1346 /* some drivers might use hw_ptr to recover from the pause - 1347 update the hw_ptr now */ 1348 if (push) 1349 snd_pcm_update_hw_ptr(substream); 1350 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1351 * a delta between the current jiffies, this gives a large enough 1352 * delta, effectively to skip the check once. 1353 */ 1354 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1355 return substream->ops->trigger(substream, 1356 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1357 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1358 } 1359 1360 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1361 { 1362 if (substream->runtime->trigger_master == substream) 1363 substream->ops->trigger(substream, 1364 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1365 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1366 } 1367 1368 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1369 { 1370 struct snd_pcm_runtime *runtime = substream->runtime; 1371 snd_pcm_trigger_tstamp(substream); 1372 if (push) { 1373 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1374 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1375 wake_up(&runtime->sleep); 1376 wake_up(&runtime->tsleep); 1377 } else { 1378 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1379 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1380 } 1381 } 1382 1383 static const struct action_ops snd_pcm_action_pause = { 1384 .pre_action = snd_pcm_pre_pause, 1385 .do_action = snd_pcm_do_pause, 1386 .undo_action = snd_pcm_undo_pause, 1387 .post_action = snd_pcm_post_pause 1388 }; 1389 1390 /* 1391 * Push/release the pause for all linked streams. 1392 */ 1393 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1394 { 1395 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1396 } 1397 1398 #ifdef CONFIG_PM 1399 /* suspend */ 1400 1401 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1402 { 1403 struct snd_pcm_runtime *runtime = substream->runtime; 1404 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1405 return -EBUSY; 1406 runtime->trigger_master = substream; 1407 return 0; 1408 } 1409 1410 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1411 { 1412 struct snd_pcm_runtime *runtime = substream->runtime; 1413 if (runtime->trigger_master != substream) 1414 return 0; 1415 if (! snd_pcm_running(substream)) 1416 return 0; 1417 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1418 return 0; /* suspend unconditionally */ 1419 } 1420 1421 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1422 { 1423 struct snd_pcm_runtime *runtime = substream->runtime; 1424 snd_pcm_trigger_tstamp(substream); 1425 runtime->status->suspended_state = runtime->status->state; 1426 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1427 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1428 wake_up(&runtime->sleep); 1429 wake_up(&runtime->tsleep); 1430 } 1431 1432 static const struct action_ops snd_pcm_action_suspend = { 1433 .pre_action = snd_pcm_pre_suspend, 1434 .do_action = snd_pcm_do_suspend, 1435 .post_action = snd_pcm_post_suspend 1436 }; 1437 1438 /** 1439 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1440 * @substream: the PCM substream 1441 * 1442 * After this call, all streams are changed to SUSPENDED state. 1443 * 1444 * Return: Zero if successful (or @substream is %NULL), or a negative error 1445 * code. 1446 */ 1447 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1448 { 1449 int err; 1450 unsigned long flags; 1451 1452 if (! substream) 1453 return 0; 1454 1455 snd_pcm_stream_lock_irqsave(substream, flags); 1456 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1457 snd_pcm_stream_unlock_irqrestore(substream, flags); 1458 return err; 1459 } 1460 1461 EXPORT_SYMBOL(snd_pcm_suspend); 1462 1463 /** 1464 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1465 * @pcm: the PCM instance 1466 * 1467 * After this call, all streams are changed to SUSPENDED state. 1468 * 1469 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1470 */ 1471 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1472 { 1473 struct snd_pcm_substream *substream; 1474 int stream, err = 0; 1475 1476 if (! pcm) 1477 return 0; 1478 1479 for (stream = 0; stream < 2; stream++) { 1480 for (substream = pcm->streams[stream].substream; 1481 substream; substream = substream->next) { 1482 /* FIXME: the open/close code should lock this as well */ 1483 if (substream->runtime == NULL) 1484 continue; 1485 err = snd_pcm_suspend(substream); 1486 if (err < 0 && err != -EBUSY) 1487 return err; 1488 } 1489 } 1490 return 0; 1491 } 1492 1493 EXPORT_SYMBOL(snd_pcm_suspend_all); 1494 1495 /* resume */ 1496 1497 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1498 { 1499 struct snd_pcm_runtime *runtime = substream->runtime; 1500 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1501 return -ENOSYS; 1502 runtime->trigger_master = substream; 1503 return 0; 1504 } 1505 1506 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1507 { 1508 struct snd_pcm_runtime *runtime = substream->runtime; 1509 if (runtime->trigger_master != substream) 1510 return 0; 1511 /* DMA not running previously? */ 1512 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1513 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1514 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1515 return 0; 1516 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1517 } 1518 1519 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1520 { 1521 if (substream->runtime->trigger_master == substream && 1522 snd_pcm_running(substream)) 1523 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1524 } 1525 1526 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1527 { 1528 struct snd_pcm_runtime *runtime = substream->runtime; 1529 snd_pcm_trigger_tstamp(substream); 1530 runtime->status->state = runtime->status->suspended_state; 1531 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1532 } 1533 1534 static const struct action_ops snd_pcm_action_resume = { 1535 .pre_action = snd_pcm_pre_resume, 1536 .do_action = snd_pcm_do_resume, 1537 .undo_action = snd_pcm_undo_resume, 1538 .post_action = snd_pcm_post_resume 1539 }; 1540 1541 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1542 { 1543 struct snd_card *card = substream->pcm->card; 1544 int res; 1545 1546 snd_power_lock(card); 1547 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1548 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1549 snd_power_unlock(card); 1550 return res; 1551 } 1552 1553 #else 1554 1555 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1556 { 1557 return -ENOSYS; 1558 } 1559 1560 #endif /* CONFIG_PM */ 1561 1562 /* 1563 * xrun ioctl 1564 * 1565 * Change the RUNNING stream(s) to XRUN state. 1566 */ 1567 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1568 { 1569 struct snd_card *card = substream->pcm->card; 1570 struct snd_pcm_runtime *runtime = substream->runtime; 1571 int result; 1572 1573 snd_power_lock(card); 1574 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1575 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1576 if (result < 0) 1577 goto _unlock; 1578 } 1579 1580 snd_pcm_stream_lock_irq(substream); 1581 switch (runtime->status->state) { 1582 case SNDRV_PCM_STATE_XRUN: 1583 result = 0; /* already there */ 1584 break; 1585 case SNDRV_PCM_STATE_RUNNING: 1586 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1587 break; 1588 default: 1589 result = -EBADFD; 1590 } 1591 snd_pcm_stream_unlock_irq(substream); 1592 _unlock: 1593 snd_power_unlock(card); 1594 return result; 1595 } 1596 1597 /* 1598 * reset ioctl 1599 */ 1600 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1601 { 1602 struct snd_pcm_runtime *runtime = substream->runtime; 1603 switch (runtime->status->state) { 1604 case SNDRV_PCM_STATE_RUNNING: 1605 case SNDRV_PCM_STATE_PREPARED: 1606 case SNDRV_PCM_STATE_PAUSED: 1607 case SNDRV_PCM_STATE_SUSPENDED: 1608 return 0; 1609 default: 1610 return -EBADFD; 1611 } 1612 } 1613 1614 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1615 { 1616 struct snd_pcm_runtime *runtime = substream->runtime; 1617 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1618 if (err < 0) 1619 return err; 1620 runtime->hw_ptr_base = 0; 1621 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1622 runtime->status->hw_ptr % runtime->period_size; 1623 runtime->silence_start = runtime->status->hw_ptr; 1624 runtime->silence_filled = 0; 1625 return 0; 1626 } 1627 1628 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1629 { 1630 struct snd_pcm_runtime *runtime = substream->runtime; 1631 runtime->control->appl_ptr = runtime->status->hw_ptr; 1632 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1633 runtime->silence_size > 0) 1634 snd_pcm_playback_silence(substream, ULONG_MAX); 1635 } 1636 1637 static const struct action_ops snd_pcm_action_reset = { 1638 .pre_action = snd_pcm_pre_reset, 1639 .do_action = snd_pcm_do_reset, 1640 .post_action = snd_pcm_post_reset 1641 }; 1642 1643 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1644 { 1645 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1646 } 1647 1648 /* 1649 * prepare ioctl 1650 */ 1651 /* we use the second argument for updating f_flags */ 1652 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1653 int f_flags) 1654 { 1655 struct snd_pcm_runtime *runtime = substream->runtime; 1656 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1657 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1658 return -EBADFD; 1659 if (snd_pcm_running(substream)) 1660 return -EBUSY; 1661 substream->f_flags = f_flags; 1662 return 0; 1663 } 1664 1665 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1666 { 1667 int err; 1668 err = substream->ops->prepare(substream); 1669 if (err < 0) 1670 return err; 1671 return snd_pcm_do_reset(substream, 0); 1672 } 1673 1674 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1675 { 1676 struct snd_pcm_runtime *runtime = substream->runtime; 1677 runtime->control->appl_ptr = runtime->status->hw_ptr; 1678 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1679 } 1680 1681 static const struct action_ops snd_pcm_action_prepare = { 1682 .pre_action = snd_pcm_pre_prepare, 1683 .do_action = snd_pcm_do_prepare, 1684 .post_action = snd_pcm_post_prepare 1685 }; 1686 1687 /** 1688 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1689 * @substream: the PCM substream instance 1690 * @file: file to refer f_flags 1691 * 1692 * Return: Zero if successful, or a negative error code. 1693 */ 1694 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1695 struct file *file) 1696 { 1697 int res; 1698 struct snd_card *card = substream->pcm->card; 1699 int f_flags; 1700 1701 if (file) 1702 f_flags = file->f_flags; 1703 else 1704 f_flags = substream->f_flags; 1705 1706 snd_power_lock(card); 1707 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1708 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1709 substream, f_flags); 1710 snd_power_unlock(card); 1711 return res; 1712 } 1713 1714 /* 1715 * drain ioctl 1716 */ 1717 1718 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1719 { 1720 struct snd_pcm_runtime *runtime = substream->runtime; 1721 switch (runtime->status->state) { 1722 case SNDRV_PCM_STATE_OPEN: 1723 case SNDRV_PCM_STATE_DISCONNECTED: 1724 case SNDRV_PCM_STATE_SUSPENDED: 1725 return -EBADFD; 1726 } 1727 runtime->trigger_master = substream; 1728 return 0; 1729 } 1730 1731 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1732 { 1733 struct snd_pcm_runtime *runtime = substream->runtime; 1734 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1735 switch (runtime->status->state) { 1736 case SNDRV_PCM_STATE_PREPARED: 1737 /* start playback stream if possible */ 1738 if (! snd_pcm_playback_empty(substream)) { 1739 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1740 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1741 } else { 1742 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1743 } 1744 break; 1745 case SNDRV_PCM_STATE_RUNNING: 1746 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1747 break; 1748 case SNDRV_PCM_STATE_XRUN: 1749 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1750 break; 1751 default: 1752 break; 1753 } 1754 } else { 1755 /* stop running stream */ 1756 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1757 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1758 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1759 snd_pcm_do_stop(substream, new_state); 1760 snd_pcm_post_stop(substream, new_state); 1761 } 1762 } 1763 1764 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1765 runtime->trigger_master == substream && 1766 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1767 return substream->ops->trigger(substream, 1768 SNDRV_PCM_TRIGGER_DRAIN); 1769 1770 return 0; 1771 } 1772 1773 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1774 { 1775 } 1776 1777 static const struct action_ops snd_pcm_action_drain_init = { 1778 .pre_action = snd_pcm_pre_drain_init, 1779 .do_action = snd_pcm_do_drain_init, 1780 .post_action = snd_pcm_post_drain_init 1781 }; 1782 1783 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1784 1785 /* 1786 * Drain the stream(s). 1787 * When the substream is linked, sync until the draining of all playback streams 1788 * is finished. 1789 * After this call, all streams are supposed to be either SETUP or DRAINING 1790 * (capture only) state. 1791 */ 1792 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1793 struct file *file) 1794 { 1795 struct snd_card *card; 1796 struct snd_pcm_runtime *runtime; 1797 struct snd_pcm_substream *s; 1798 wait_queue_t wait; 1799 int result = 0; 1800 int nonblock = 0; 1801 1802 card = substream->pcm->card; 1803 runtime = substream->runtime; 1804 1805 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1806 return -EBADFD; 1807 1808 snd_power_lock(card); 1809 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1810 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1811 if (result < 0) { 1812 snd_power_unlock(card); 1813 return result; 1814 } 1815 } 1816 1817 if (file) { 1818 if (file->f_flags & O_NONBLOCK) 1819 nonblock = 1; 1820 } else if (substream->f_flags & O_NONBLOCK) 1821 nonblock = 1; 1822 1823 down_read(&snd_pcm_link_rwsem); 1824 snd_pcm_stream_lock_irq(substream); 1825 /* resume pause */ 1826 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1827 snd_pcm_pause(substream, 0); 1828 1829 /* pre-start/stop - all running streams are changed to DRAINING state */ 1830 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1831 if (result < 0) 1832 goto unlock; 1833 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1834 if (nonblock) { 1835 result = -EAGAIN; 1836 goto unlock; 1837 } 1838 1839 for (;;) { 1840 long tout; 1841 struct snd_pcm_runtime *to_check; 1842 if (signal_pending(current)) { 1843 result = -ERESTARTSYS; 1844 break; 1845 } 1846 /* find a substream to drain */ 1847 to_check = NULL; 1848 snd_pcm_group_for_each_entry(s, substream) { 1849 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1850 continue; 1851 runtime = s->runtime; 1852 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1853 to_check = runtime; 1854 break; 1855 } 1856 } 1857 if (!to_check) 1858 break; /* all drained */ 1859 init_waitqueue_entry(&wait, current); 1860 add_wait_queue(&to_check->sleep, &wait); 1861 snd_pcm_stream_unlock_irq(substream); 1862 up_read(&snd_pcm_link_rwsem); 1863 snd_power_unlock(card); 1864 if (runtime->no_period_wakeup) 1865 tout = MAX_SCHEDULE_TIMEOUT; 1866 else { 1867 tout = 10; 1868 if (runtime->rate) { 1869 long t = runtime->period_size * 2 / runtime->rate; 1870 tout = max(t, tout); 1871 } 1872 tout = msecs_to_jiffies(tout * 1000); 1873 } 1874 tout = schedule_timeout_interruptible(tout); 1875 snd_power_lock(card); 1876 down_read(&snd_pcm_link_rwsem); 1877 snd_pcm_stream_lock_irq(substream); 1878 remove_wait_queue(&to_check->sleep, &wait); 1879 if (card->shutdown) { 1880 result = -ENODEV; 1881 break; 1882 } 1883 if (tout == 0) { 1884 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1885 result = -ESTRPIPE; 1886 else { 1887 dev_dbg(substream->pcm->card->dev, 1888 "playback drain error (DMA or IRQ trouble?)\n"); 1889 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1890 result = -EIO; 1891 } 1892 break; 1893 } 1894 } 1895 1896 unlock: 1897 snd_pcm_stream_unlock_irq(substream); 1898 up_read(&snd_pcm_link_rwsem); 1899 snd_power_unlock(card); 1900 1901 return result; 1902 } 1903 1904 /* 1905 * drop ioctl 1906 * 1907 * Immediately put all linked substreams into SETUP state. 1908 */ 1909 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1910 { 1911 struct snd_pcm_runtime *runtime; 1912 int result = 0; 1913 1914 if (PCM_RUNTIME_CHECK(substream)) 1915 return -ENXIO; 1916 runtime = substream->runtime; 1917 1918 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1919 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1920 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1921 return -EBADFD; 1922 1923 snd_pcm_stream_lock_irq(substream); 1924 /* resume pause */ 1925 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1926 snd_pcm_pause(substream, 0); 1927 1928 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1929 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1930 snd_pcm_stream_unlock_irq(substream); 1931 1932 return result; 1933 } 1934 1935 1936 static bool is_pcm_file(struct file *file) 1937 { 1938 struct inode *inode = file_inode(file); 1939 unsigned int minor; 1940 1941 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1942 return false; 1943 minor = iminor(inode); 1944 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1945 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1946 } 1947 1948 /* 1949 * PCM link handling 1950 */ 1951 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1952 { 1953 int res = 0; 1954 struct snd_pcm_file *pcm_file; 1955 struct snd_pcm_substream *substream1; 1956 struct snd_pcm_group *group; 1957 struct fd f = fdget(fd); 1958 1959 if (!f.file) 1960 return -EBADFD; 1961 if (!is_pcm_file(f.file)) { 1962 res = -EBADFD; 1963 goto _badf; 1964 } 1965 pcm_file = f.file->private_data; 1966 substream1 = pcm_file->substream; 1967 group = kmalloc(sizeof(*group), GFP_KERNEL); 1968 if (!group) { 1969 res = -ENOMEM; 1970 goto _nolock; 1971 } 1972 down_write_nonblock(&snd_pcm_link_rwsem); 1973 write_lock_irq(&snd_pcm_link_rwlock); 1974 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1975 substream->runtime->status->state != substream1->runtime->status->state || 1976 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1977 res = -EBADFD; 1978 goto _end; 1979 } 1980 if (snd_pcm_stream_linked(substream1)) { 1981 res = -EALREADY; 1982 goto _end; 1983 } 1984 if (!snd_pcm_stream_linked(substream)) { 1985 substream->group = group; 1986 group = NULL; 1987 spin_lock_init(&substream->group->lock); 1988 mutex_init(&substream->group->mutex); 1989 INIT_LIST_HEAD(&substream->group->substreams); 1990 list_add_tail(&substream->link_list, &substream->group->substreams); 1991 substream->group->count = 1; 1992 } 1993 list_add_tail(&substream1->link_list, &substream->group->substreams); 1994 substream->group->count++; 1995 substream1->group = substream->group; 1996 _end: 1997 write_unlock_irq(&snd_pcm_link_rwlock); 1998 up_write(&snd_pcm_link_rwsem); 1999 _nolock: 2000 snd_card_unref(substream1->pcm->card); 2001 kfree(group); 2002 _badf: 2003 fdput(f); 2004 return res; 2005 } 2006 2007 static void relink_to_local(struct snd_pcm_substream *substream) 2008 { 2009 substream->group = &substream->self_group; 2010 INIT_LIST_HEAD(&substream->self_group.substreams); 2011 list_add_tail(&substream->link_list, &substream->self_group.substreams); 2012 } 2013 2014 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2015 { 2016 struct snd_pcm_substream *s; 2017 int res = 0; 2018 2019 down_write_nonblock(&snd_pcm_link_rwsem); 2020 write_lock_irq(&snd_pcm_link_rwlock); 2021 if (!snd_pcm_stream_linked(substream)) { 2022 res = -EALREADY; 2023 goto _end; 2024 } 2025 list_del(&substream->link_list); 2026 substream->group->count--; 2027 if (substream->group->count == 1) { /* detach the last stream, too */ 2028 snd_pcm_group_for_each_entry(s, substream) { 2029 relink_to_local(s); 2030 break; 2031 } 2032 kfree(substream->group); 2033 } 2034 relink_to_local(substream); 2035 _end: 2036 write_unlock_irq(&snd_pcm_link_rwlock); 2037 up_write(&snd_pcm_link_rwsem); 2038 return res; 2039 } 2040 2041 /* 2042 * hw configurator 2043 */ 2044 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2045 struct snd_pcm_hw_rule *rule) 2046 { 2047 struct snd_interval t; 2048 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2049 hw_param_interval_c(params, rule->deps[1]), &t); 2050 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2051 } 2052 2053 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2054 struct snd_pcm_hw_rule *rule) 2055 { 2056 struct snd_interval t; 2057 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2058 hw_param_interval_c(params, rule->deps[1]), &t); 2059 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2060 } 2061 2062 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2063 struct snd_pcm_hw_rule *rule) 2064 { 2065 struct snd_interval t; 2066 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2067 hw_param_interval_c(params, rule->deps[1]), 2068 (unsigned long) rule->private, &t); 2069 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2070 } 2071 2072 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2073 struct snd_pcm_hw_rule *rule) 2074 { 2075 struct snd_interval t; 2076 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2077 (unsigned long) rule->private, 2078 hw_param_interval_c(params, rule->deps[1]), &t); 2079 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2080 } 2081 2082 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2083 struct snd_pcm_hw_rule *rule) 2084 { 2085 unsigned int k; 2086 const struct snd_interval *i = 2087 hw_param_interval_c(params, rule->deps[0]); 2088 struct snd_mask m; 2089 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2090 snd_mask_any(&m); 2091 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2092 int bits; 2093 if (! snd_mask_test(mask, k)) 2094 continue; 2095 bits = snd_pcm_format_physical_width(k); 2096 if (bits <= 0) 2097 continue; /* ignore invalid formats */ 2098 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2099 snd_mask_reset(&m, k); 2100 } 2101 return snd_mask_refine(mask, &m); 2102 } 2103 2104 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2105 struct snd_pcm_hw_rule *rule) 2106 { 2107 struct snd_interval t; 2108 unsigned int k; 2109 t.min = UINT_MAX; 2110 t.max = 0; 2111 t.openmin = 0; 2112 t.openmax = 0; 2113 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2114 int bits; 2115 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2116 continue; 2117 bits = snd_pcm_format_physical_width(k); 2118 if (bits <= 0) 2119 continue; /* ignore invalid formats */ 2120 if (t.min > (unsigned)bits) 2121 t.min = bits; 2122 if (t.max < (unsigned)bits) 2123 t.max = bits; 2124 } 2125 t.integer = 1; 2126 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2127 } 2128 2129 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2130 #error "Change this table" 2131 #endif 2132 2133 static const unsigned int rates[] = { 2134 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2135 48000, 64000, 88200, 96000, 176400, 192000 2136 }; 2137 2138 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2139 .count = ARRAY_SIZE(rates), 2140 .list = rates, 2141 }; 2142 2143 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2144 struct snd_pcm_hw_rule *rule) 2145 { 2146 struct snd_pcm_hardware *hw = rule->private; 2147 return snd_interval_list(hw_param_interval(params, rule->var), 2148 snd_pcm_known_rates.count, 2149 snd_pcm_known_rates.list, hw->rates); 2150 } 2151 2152 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2153 struct snd_pcm_hw_rule *rule) 2154 { 2155 struct snd_interval t; 2156 struct snd_pcm_substream *substream = rule->private; 2157 t.min = 0; 2158 t.max = substream->buffer_bytes_max; 2159 t.openmin = 0; 2160 t.openmax = 0; 2161 t.integer = 1; 2162 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2163 } 2164 2165 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2166 { 2167 struct snd_pcm_runtime *runtime = substream->runtime; 2168 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2169 int k, err; 2170 2171 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2172 snd_mask_any(constrs_mask(constrs, k)); 2173 } 2174 2175 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2176 snd_interval_any(constrs_interval(constrs, k)); 2177 } 2178 2179 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2180 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2181 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2182 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2183 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2184 2185 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2186 snd_pcm_hw_rule_format, NULL, 2187 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2188 if (err < 0) 2189 return err; 2190 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2191 snd_pcm_hw_rule_sample_bits, NULL, 2192 SNDRV_PCM_HW_PARAM_FORMAT, 2193 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2194 if (err < 0) 2195 return err; 2196 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2197 snd_pcm_hw_rule_div, NULL, 2198 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2199 if (err < 0) 2200 return err; 2201 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2202 snd_pcm_hw_rule_mul, NULL, 2203 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2204 if (err < 0) 2205 return err; 2206 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2207 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2208 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2209 if (err < 0) 2210 return err; 2211 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2212 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2213 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2214 if (err < 0) 2215 return err; 2216 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2217 snd_pcm_hw_rule_div, NULL, 2218 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2219 if (err < 0) 2220 return err; 2221 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2222 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2223 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2224 if (err < 0) 2225 return err; 2226 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2227 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2228 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2229 if (err < 0) 2230 return err; 2231 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2232 snd_pcm_hw_rule_div, NULL, 2233 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2234 if (err < 0) 2235 return err; 2236 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2237 snd_pcm_hw_rule_div, NULL, 2238 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2239 if (err < 0) 2240 return err; 2241 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2242 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2243 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2244 if (err < 0) 2245 return err; 2246 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2247 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2248 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2249 if (err < 0) 2250 return err; 2251 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2252 snd_pcm_hw_rule_mul, NULL, 2253 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2254 if (err < 0) 2255 return err; 2256 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2257 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2258 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2259 if (err < 0) 2260 return err; 2261 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2262 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2263 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2264 if (err < 0) 2265 return err; 2266 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2267 snd_pcm_hw_rule_muldivk, (void*) 8, 2268 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2269 if (err < 0) 2270 return err; 2271 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2272 snd_pcm_hw_rule_muldivk, (void*) 8, 2273 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2274 if (err < 0) 2275 return err; 2276 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2277 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2278 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2279 if (err < 0) 2280 return err; 2281 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2282 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2283 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2284 if (err < 0) 2285 return err; 2286 return 0; 2287 } 2288 2289 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2290 { 2291 struct snd_pcm_runtime *runtime = substream->runtime; 2292 struct snd_pcm_hardware *hw = &runtime->hw; 2293 int err; 2294 unsigned int mask = 0; 2295 2296 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2297 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2298 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2299 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2300 if (hw_support_mmap(substream)) { 2301 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2302 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2303 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2304 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2305 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2306 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2307 } 2308 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2309 if (err < 0) 2310 return err; 2311 2312 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2313 if (err < 0) 2314 return err; 2315 2316 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2317 if (err < 0) 2318 return err; 2319 2320 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2321 hw->channels_min, hw->channels_max); 2322 if (err < 0) 2323 return err; 2324 2325 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2326 hw->rate_min, hw->rate_max); 2327 if (err < 0) 2328 return err; 2329 2330 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2331 hw->period_bytes_min, hw->period_bytes_max); 2332 if (err < 0) 2333 return err; 2334 2335 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2336 hw->periods_min, hw->periods_max); 2337 if (err < 0) 2338 return err; 2339 2340 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2341 hw->period_bytes_min, hw->buffer_bytes_max); 2342 if (err < 0) 2343 return err; 2344 2345 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2346 snd_pcm_hw_rule_buffer_bytes_max, substream, 2347 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2348 if (err < 0) 2349 return err; 2350 2351 /* FIXME: remove */ 2352 if (runtime->dma_bytes) { 2353 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2354 if (err < 0) 2355 return err; 2356 } 2357 2358 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2359 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2360 snd_pcm_hw_rule_rate, hw, 2361 SNDRV_PCM_HW_PARAM_RATE, -1); 2362 if (err < 0) 2363 return err; 2364 } 2365 2366 /* FIXME: this belong to lowlevel */ 2367 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2368 2369 return 0; 2370 } 2371 2372 static void pcm_release_private(struct snd_pcm_substream *substream) 2373 { 2374 snd_pcm_unlink(substream); 2375 } 2376 2377 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2378 { 2379 substream->ref_count--; 2380 if (substream->ref_count > 0) 2381 return; 2382 2383 snd_pcm_drop(substream); 2384 if (substream->hw_opened) { 2385 if (substream->ops->hw_free && 2386 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2387 substream->ops->hw_free(substream); 2388 substream->ops->close(substream); 2389 substream->hw_opened = 0; 2390 } 2391 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2392 pm_qos_remove_request(&substream->latency_pm_qos_req); 2393 if (substream->pcm_release) { 2394 substream->pcm_release(substream); 2395 substream->pcm_release = NULL; 2396 } 2397 snd_pcm_detach_substream(substream); 2398 } 2399 2400 EXPORT_SYMBOL(snd_pcm_release_substream); 2401 2402 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2403 struct file *file, 2404 struct snd_pcm_substream **rsubstream) 2405 { 2406 struct snd_pcm_substream *substream; 2407 int err; 2408 2409 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2410 if (err < 0) 2411 return err; 2412 if (substream->ref_count > 1) { 2413 *rsubstream = substream; 2414 return 0; 2415 } 2416 2417 err = snd_pcm_hw_constraints_init(substream); 2418 if (err < 0) { 2419 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2420 goto error; 2421 } 2422 2423 if ((err = substream->ops->open(substream)) < 0) 2424 goto error; 2425 2426 substream->hw_opened = 1; 2427 2428 err = snd_pcm_hw_constraints_complete(substream); 2429 if (err < 0) { 2430 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2431 goto error; 2432 } 2433 2434 *rsubstream = substream; 2435 return 0; 2436 2437 error: 2438 snd_pcm_release_substream(substream); 2439 return err; 2440 } 2441 2442 EXPORT_SYMBOL(snd_pcm_open_substream); 2443 2444 static int snd_pcm_open_file(struct file *file, 2445 struct snd_pcm *pcm, 2446 int stream) 2447 { 2448 struct snd_pcm_file *pcm_file; 2449 struct snd_pcm_substream *substream; 2450 int err; 2451 2452 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2453 if (err < 0) 2454 return err; 2455 2456 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2457 if (pcm_file == NULL) { 2458 snd_pcm_release_substream(substream); 2459 return -ENOMEM; 2460 } 2461 pcm_file->substream = substream; 2462 if (substream->ref_count == 1) { 2463 substream->file = pcm_file; 2464 substream->pcm_release = pcm_release_private; 2465 } 2466 file->private_data = pcm_file; 2467 2468 return 0; 2469 } 2470 2471 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2472 { 2473 struct snd_pcm *pcm; 2474 int err = nonseekable_open(inode, file); 2475 if (err < 0) 2476 return err; 2477 pcm = snd_lookup_minor_data(iminor(inode), 2478 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2479 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2480 if (pcm) 2481 snd_card_unref(pcm->card); 2482 return err; 2483 } 2484 2485 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2486 { 2487 struct snd_pcm *pcm; 2488 int err = nonseekable_open(inode, file); 2489 if (err < 0) 2490 return err; 2491 pcm = snd_lookup_minor_data(iminor(inode), 2492 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2493 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2494 if (pcm) 2495 snd_card_unref(pcm->card); 2496 return err; 2497 } 2498 2499 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2500 { 2501 int err; 2502 wait_queue_t wait; 2503 2504 if (pcm == NULL) { 2505 err = -ENODEV; 2506 goto __error1; 2507 } 2508 err = snd_card_file_add(pcm->card, file); 2509 if (err < 0) 2510 goto __error1; 2511 if (!try_module_get(pcm->card->module)) { 2512 err = -EFAULT; 2513 goto __error2; 2514 } 2515 init_waitqueue_entry(&wait, current); 2516 add_wait_queue(&pcm->open_wait, &wait); 2517 mutex_lock(&pcm->open_mutex); 2518 while (1) { 2519 err = snd_pcm_open_file(file, pcm, stream); 2520 if (err >= 0) 2521 break; 2522 if (err == -EAGAIN) { 2523 if (file->f_flags & O_NONBLOCK) { 2524 err = -EBUSY; 2525 break; 2526 } 2527 } else 2528 break; 2529 set_current_state(TASK_INTERRUPTIBLE); 2530 mutex_unlock(&pcm->open_mutex); 2531 schedule(); 2532 mutex_lock(&pcm->open_mutex); 2533 if (pcm->card->shutdown) { 2534 err = -ENODEV; 2535 break; 2536 } 2537 if (signal_pending(current)) { 2538 err = -ERESTARTSYS; 2539 break; 2540 } 2541 } 2542 remove_wait_queue(&pcm->open_wait, &wait); 2543 mutex_unlock(&pcm->open_mutex); 2544 if (err < 0) 2545 goto __error; 2546 return err; 2547 2548 __error: 2549 module_put(pcm->card->module); 2550 __error2: 2551 snd_card_file_remove(pcm->card, file); 2552 __error1: 2553 return err; 2554 } 2555 2556 static int snd_pcm_release(struct inode *inode, struct file *file) 2557 { 2558 struct snd_pcm *pcm; 2559 struct snd_pcm_substream *substream; 2560 struct snd_pcm_file *pcm_file; 2561 2562 pcm_file = file->private_data; 2563 substream = pcm_file->substream; 2564 if (snd_BUG_ON(!substream)) 2565 return -ENXIO; 2566 pcm = substream->pcm; 2567 mutex_lock(&pcm->open_mutex); 2568 snd_pcm_release_substream(substream); 2569 kfree(pcm_file); 2570 mutex_unlock(&pcm->open_mutex); 2571 wake_up(&pcm->open_wait); 2572 module_put(pcm->card->module); 2573 snd_card_file_remove(pcm->card, file); 2574 return 0; 2575 } 2576 2577 /* check and update PCM state; return 0 or a negative error 2578 * call this inside PCM lock 2579 */ 2580 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2581 { 2582 switch (substream->runtime->status->state) { 2583 case SNDRV_PCM_STATE_DRAINING: 2584 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2585 return -EBADFD; 2586 /* Fall through */ 2587 case SNDRV_PCM_STATE_RUNNING: 2588 return snd_pcm_update_hw_ptr(substream); 2589 case SNDRV_PCM_STATE_PREPARED: 2590 case SNDRV_PCM_STATE_PAUSED: 2591 return 0; 2592 case SNDRV_PCM_STATE_SUSPENDED: 2593 return -ESTRPIPE; 2594 case SNDRV_PCM_STATE_XRUN: 2595 return -EPIPE; 2596 default: 2597 return -EBADFD; 2598 } 2599 } 2600 2601 /* increase the appl_ptr; returns the processed frames or a negative error */ 2602 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2603 snd_pcm_uframes_t frames, 2604 snd_pcm_sframes_t avail) 2605 { 2606 struct snd_pcm_runtime *runtime = substream->runtime; 2607 snd_pcm_sframes_t appl_ptr; 2608 int ret; 2609 2610 if (avail <= 0) 2611 return 0; 2612 if (frames > (snd_pcm_uframes_t)avail) 2613 frames = avail; 2614 appl_ptr = runtime->control->appl_ptr + frames; 2615 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2616 appl_ptr -= runtime->boundary; 2617 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2618 return ret < 0 ? ret : frames; 2619 } 2620 2621 /* decrease the appl_ptr; returns the processed frames or a negative error */ 2622 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2623 snd_pcm_uframes_t frames, 2624 snd_pcm_sframes_t avail) 2625 { 2626 struct snd_pcm_runtime *runtime = substream->runtime; 2627 snd_pcm_sframes_t appl_ptr; 2628 int ret; 2629 2630 if (avail <= 0) 2631 return 0; 2632 if (frames > (snd_pcm_uframes_t)avail) 2633 frames = avail; 2634 appl_ptr = runtime->control->appl_ptr - frames; 2635 if (appl_ptr < 0) 2636 appl_ptr += runtime->boundary; 2637 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2638 return ret < 0 ? ret : frames; 2639 } 2640 2641 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2642 snd_pcm_uframes_t frames) 2643 { 2644 struct snd_pcm_runtime *runtime = substream->runtime; 2645 snd_pcm_sframes_t ret; 2646 2647 if (frames == 0) 2648 return 0; 2649 2650 snd_pcm_stream_lock_irq(substream); 2651 ret = do_pcm_hwsync(substream); 2652 if (!ret) 2653 ret = rewind_appl_ptr(substream, frames, 2654 snd_pcm_playback_hw_avail(runtime)); 2655 snd_pcm_stream_unlock_irq(substream); 2656 return ret; 2657 } 2658 2659 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2660 snd_pcm_uframes_t frames) 2661 { 2662 struct snd_pcm_runtime *runtime = substream->runtime; 2663 snd_pcm_sframes_t ret; 2664 2665 if (frames == 0) 2666 return 0; 2667 2668 snd_pcm_stream_lock_irq(substream); 2669 ret = do_pcm_hwsync(substream); 2670 if (!ret) 2671 ret = rewind_appl_ptr(substream, frames, 2672 snd_pcm_capture_hw_avail(runtime)); 2673 snd_pcm_stream_unlock_irq(substream); 2674 return ret; 2675 } 2676 2677 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2678 snd_pcm_uframes_t frames) 2679 { 2680 struct snd_pcm_runtime *runtime = substream->runtime; 2681 snd_pcm_sframes_t ret; 2682 2683 if (frames == 0) 2684 return 0; 2685 2686 snd_pcm_stream_lock_irq(substream); 2687 ret = do_pcm_hwsync(substream); 2688 if (!ret) 2689 ret = forward_appl_ptr(substream, frames, 2690 snd_pcm_playback_avail(runtime)); 2691 snd_pcm_stream_unlock_irq(substream); 2692 return ret; 2693 } 2694 2695 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2696 snd_pcm_uframes_t frames) 2697 { 2698 struct snd_pcm_runtime *runtime = substream->runtime; 2699 snd_pcm_sframes_t ret; 2700 2701 if (frames == 0) 2702 return 0; 2703 2704 snd_pcm_stream_lock_irq(substream); 2705 ret = do_pcm_hwsync(substream); 2706 if (!ret) 2707 ret = forward_appl_ptr(substream, frames, 2708 snd_pcm_capture_avail(runtime)); 2709 snd_pcm_stream_unlock_irq(substream); 2710 return ret; 2711 } 2712 2713 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2714 { 2715 int err; 2716 2717 snd_pcm_stream_lock_irq(substream); 2718 err = do_pcm_hwsync(substream); 2719 snd_pcm_stream_unlock_irq(substream); 2720 return err; 2721 } 2722 2723 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream) 2724 { 2725 struct snd_pcm_runtime *runtime = substream->runtime; 2726 int err; 2727 snd_pcm_sframes_t n = 0; 2728 2729 snd_pcm_stream_lock_irq(substream); 2730 err = do_pcm_hwsync(substream); 2731 if (!err) { 2732 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2733 n = snd_pcm_playback_hw_avail(runtime); 2734 else 2735 n = snd_pcm_capture_avail(runtime); 2736 n += runtime->delay; 2737 } 2738 snd_pcm_stream_unlock_irq(substream); 2739 return err < 0 ? err : n; 2740 } 2741 2742 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2743 struct snd_pcm_sync_ptr __user *_sync_ptr) 2744 { 2745 struct snd_pcm_runtime *runtime = substream->runtime; 2746 struct snd_pcm_sync_ptr sync_ptr; 2747 volatile struct snd_pcm_mmap_status *status; 2748 volatile struct snd_pcm_mmap_control *control; 2749 int err; 2750 2751 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2752 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2753 return -EFAULT; 2754 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2755 return -EFAULT; 2756 status = runtime->status; 2757 control = runtime->control; 2758 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2759 err = snd_pcm_hwsync(substream); 2760 if (err < 0) 2761 return err; 2762 } 2763 snd_pcm_stream_lock_irq(substream); 2764 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2765 err = pcm_lib_apply_appl_ptr(substream, 2766 sync_ptr.c.control.appl_ptr); 2767 if (err < 0) { 2768 snd_pcm_stream_unlock_irq(substream); 2769 return err; 2770 } 2771 } else { 2772 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2773 } 2774 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2775 control->avail_min = sync_ptr.c.control.avail_min; 2776 else 2777 sync_ptr.c.control.avail_min = control->avail_min; 2778 sync_ptr.s.status.state = status->state; 2779 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2780 sync_ptr.s.status.tstamp = status->tstamp; 2781 sync_ptr.s.status.suspended_state = status->suspended_state; 2782 snd_pcm_stream_unlock_irq(substream); 2783 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2784 return -EFAULT; 2785 return 0; 2786 } 2787 2788 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2789 { 2790 struct snd_pcm_runtime *runtime = substream->runtime; 2791 int arg; 2792 2793 if (get_user(arg, _arg)) 2794 return -EFAULT; 2795 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2796 return -EINVAL; 2797 runtime->tstamp_type = arg; 2798 return 0; 2799 } 2800 2801 static int snd_pcm_common_ioctl1(struct file *file, 2802 struct snd_pcm_substream *substream, 2803 unsigned int cmd, void __user *arg) 2804 { 2805 switch (cmd) { 2806 case SNDRV_PCM_IOCTL_PVERSION: 2807 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2808 case SNDRV_PCM_IOCTL_INFO: 2809 return snd_pcm_info_user(substream, arg); 2810 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2811 return 0; 2812 case SNDRV_PCM_IOCTL_TTSTAMP: 2813 return snd_pcm_tstamp(substream, arg); 2814 case SNDRV_PCM_IOCTL_HW_REFINE: 2815 return snd_pcm_hw_refine_user(substream, arg); 2816 case SNDRV_PCM_IOCTL_HW_PARAMS: 2817 return snd_pcm_hw_params_user(substream, arg); 2818 case SNDRV_PCM_IOCTL_HW_FREE: 2819 return snd_pcm_hw_free(substream); 2820 case SNDRV_PCM_IOCTL_SW_PARAMS: 2821 return snd_pcm_sw_params_user(substream, arg); 2822 case SNDRV_PCM_IOCTL_STATUS: 2823 return snd_pcm_status_user(substream, arg, false); 2824 case SNDRV_PCM_IOCTL_STATUS_EXT: 2825 return snd_pcm_status_user(substream, arg, true); 2826 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2827 return snd_pcm_channel_info_user(substream, arg); 2828 case SNDRV_PCM_IOCTL_PREPARE: 2829 return snd_pcm_prepare(substream, file); 2830 case SNDRV_PCM_IOCTL_RESET: 2831 return snd_pcm_reset(substream); 2832 case SNDRV_PCM_IOCTL_START: 2833 return snd_pcm_start_lock_irq(substream); 2834 case SNDRV_PCM_IOCTL_LINK: 2835 return snd_pcm_link(substream, (int)(unsigned long) arg); 2836 case SNDRV_PCM_IOCTL_UNLINK: 2837 return snd_pcm_unlink(substream); 2838 case SNDRV_PCM_IOCTL_RESUME: 2839 return snd_pcm_resume(substream); 2840 case SNDRV_PCM_IOCTL_XRUN: 2841 return snd_pcm_xrun(substream); 2842 case SNDRV_PCM_IOCTL_HWSYNC: 2843 return snd_pcm_hwsync(substream); 2844 case SNDRV_PCM_IOCTL_DELAY: 2845 { 2846 snd_pcm_sframes_t delay = snd_pcm_delay(substream); 2847 snd_pcm_sframes_t __user *res = arg; 2848 2849 if (delay < 0) 2850 return delay; 2851 if (put_user(delay, res)) 2852 return -EFAULT; 2853 return 0; 2854 } 2855 case SNDRV_PCM_IOCTL_SYNC_PTR: 2856 return snd_pcm_sync_ptr(substream, arg); 2857 #ifdef CONFIG_SND_SUPPORT_OLD_API 2858 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2859 return snd_pcm_hw_refine_old_user(substream, arg); 2860 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2861 return snd_pcm_hw_params_old_user(substream, arg); 2862 #endif 2863 case SNDRV_PCM_IOCTL_DRAIN: 2864 return snd_pcm_drain(substream, file); 2865 case SNDRV_PCM_IOCTL_DROP: 2866 return snd_pcm_drop(substream); 2867 case SNDRV_PCM_IOCTL_PAUSE: 2868 { 2869 int res; 2870 snd_pcm_stream_lock_irq(substream); 2871 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2872 snd_pcm_stream_unlock_irq(substream); 2873 return res; 2874 } 2875 } 2876 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2877 return -ENOTTY; 2878 } 2879 2880 static int snd_pcm_playback_ioctl1(struct file *file, 2881 struct snd_pcm_substream *substream, 2882 unsigned int cmd, void __user *arg) 2883 { 2884 if (snd_BUG_ON(!substream)) 2885 return -ENXIO; 2886 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2887 return -EINVAL; 2888 switch (cmd) { 2889 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2890 { 2891 struct snd_xferi xferi; 2892 struct snd_xferi __user *_xferi = arg; 2893 struct snd_pcm_runtime *runtime = substream->runtime; 2894 snd_pcm_sframes_t result; 2895 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2896 return -EBADFD; 2897 if (put_user(0, &_xferi->result)) 2898 return -EFAULT; 2899 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2900 return -EFAULT; 2901 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2902 __put_user(result, &_xferi->result); 2903 return result < 0 ? result : 0; 2904 } 2905 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2906 { 2907 struct snd_xfern xfern; 2908 struct snd_xfern __user *_xfern = arg; 2909 struct snd_pcm_runtime *runtime = substream->runtime; 2910 void __user **bufs; 2911 snd_pcm_sframes_t result; 2912 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2913 return -EBADFD; 2914 if (runtime->channels > 128) 2915 return -EINVAL; 2916 if (put_user(0, &_xfern->result)) 2917 return -EFAULT; 2918 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2919 return -EFAULT; 2920 2921 bufs = memdup_user(xfern.bufs, 2922 sizeof(void *) * runtime->channels); 2923 if (IS_ERR(bufs)) 2924 return PTR_ERR(bufs); 2925 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2926 kfree(bufs); 2927 __put_user(result, &_xfern->result); 2928 return result < 0 ? result : 0; 2929 } 2930 case SNDRV_PCM_IOCTL_REWIND: 2931 { 2932 snd_pcm_uframes_t frames; 2933 snd_pcm_uframes_t __user *_frames = arg; 2934 snd_pcm_sframes_t result; 2935 if (get_user(frames, _frames)) 2936 return -EFAULT; 2937 if (put_user(0, _frames)) 2938 return -EFAULT; 2939 result = snd_pcm_playback_rewind(substream, frames); 2940 __put_user(result, _frames); 2941 return result < 0 ? result : 0; 2942 } 2943 case SNDRV_PCM_IOCTL_FORWARD: 2944 { 2945 snd_pcm_uframes_t frames; 2946 snd_pcm_uframes_t __user *_frames = arg; 2947 snd_pcm_sframes_t result; 2948 if (get_user(frames, _frames)) 2949 return -EFAULT; 2950 if (put_user(0, _frames)) 2951 return -EFAULT; 2952 result = snd_pcm_playback_forward(substream, frames); 2953 __put_user(result, _frames); 2954 return result < 0 ? result : 0; 2955 } 2956 } 2957 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2958 } 2959 2960 static int snd_pcm_capture_ioctl1(struct file *file, 2961 struct snd_pcm_substream *substream, 2962 unsigned int cmd, void __user *arg) 2963 { 2964 if (snd_BUG_ON(!substream)) 2965 return -ENXIO; 2966 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2967 return -EINVAL; 2968 switch (cmd) { 2969 case SNDRV_PCM_IOCTL_READI_FRAMES: 2970 { 2971 struct snd_xferi xferi; 2972 struct snd_xferi __user *_xferi = arg; 2973 struct snd_pcm_runtime *runtime = substream->runtime; 2974 snd_pcm_sframes_t result; 2975 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2976 return -EBADFD; 2977 if (put_user(0, &_xferi->result)) 2978 return -EFAULT; 2979 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2980 return -EFAULT; 2981 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2982 __put_user(result, &_xferi->result); 2983 return result < 0 ? result : 0; 2984 } 2985 case SNDRV_PCM_IOCTL_READN_FRAMES: 2986 { 2987 struct snd_xfern xfern; 2988 struct snd_xfern __user *_xfern = arg; 2989 struct snd_pcm_runtime *runtime = substream->runtime; 2990 void *bufs; 2991 snd_pcm_sframes_t result; 2992 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2993 return -EBADFD; 2994 if (runtime->channels > 128) 2995 return -EINVAL; 2996 if (put_user(0, &_xfern->result)) 2997 return -EFAULT; 2998 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2999 return -EFAULT; 3000 3001 bufs = memdup_user(xfern.bufs, 3002 sizeof(void *) * runtime->channels); 3003 if (IS_ERR(bufs)) 3004 return PTR_ERR(bufs); 3005 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 3006 kfree(bufs); 3007 __put_user(result, &_xfern->result); 3008 return result < 0 ? result : 0; 3009 } 3010 case SNDRV_PCM_IOCTL_REWIND: 3011 { 3012 snd_pcm_uframes_t frames; 3013 snd_pcm_uframes_t __user *_frames = arg; 3014 snd_pcm_sframes_t result; 3015 if (get_user(frames, _frames)) 3016 return -EFAULT; 3017 if (put_user(0, _frames)) 3018 return -EFAULT; 3019 result = snd_pcm_capture_rewind(substream, frames); 3020 __put_user(result, _frames); 3021 return result < 0 ? result : 0; 3022 } 3023 case SNDRV_PCM_IOCTL_FORWARD: 3024 { 3025 snd_pcm_uframes_t frames; 3026 snd_pcm_uframes_t __user *_frames = arg; 3027 snd_pcm_sframes_t result; 3028 if (get_user(frames, _frames)) 3029 return -EFAULT; 3030 if (put_user(0, _frames)) 3031 return -EFAULT; 3032 result = snd_pcm_capture_forward(substream, frames); 3033 __put_user(result, _frames); 3034 return result < 0 ? result : 0; 3035 } 3036 } 3037 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 3038 } 3039 3040 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 3041 unsigned long arg) 3042 { 3043 struct snd_pcm_file *pcm_file; 3044 3045 pcm_file = file->private_data; 3046 3047 if (((cmd >> 8) & 0xff) != 'A') 3048 return -ENOTTY; 3049 3050 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 3051 (void __user *)arg); 3052 } 3053 3054 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 3055 unsigned long arg) 3056 { 3057 struct snd_pcm_file *pcm_file; 3058 3059 pcm_file = file->private_data; 3060 3061 if (((cmd >> 8) & 0xff) != 'A') 3062 return -ENOTTY; 3063 3064 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 3065 (void __user *)arg); 3066 } 3067 3068 /** 3069 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3070 * @substream: PCM substream 3071 * @cmd: IOCTL cmd 3072 * @arg: IOCTL argument 3073 * 3074 * The function is provided primarily for OSS layer and USB gadget drivers, 3075 * and it allows only the limited set of ioctls (hw_params, sw_params, 3076 * prepare, start, drain, drop, forward). 3077 */ 3078 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3079 unsigned int cmd, void *arg) 3080 { 3081 snd_pcm_uframes_t *frames = arg; 3082 snd_pcm_sframes_t result; 3083 3084 switch (cmd) { 3085 case SNDRV_PCM_IOCTL_FORWARD: 3086 { 3087 /* provided only for OSS; capture-only and no value returned */ 3088 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3089 return -EINVAL; 3090 result = snd_pcm_capture_forward(substream, *frames); 3091 return result < 0 ? result : 0; 3092 } 3093 case SNDRV_PCM_IOCTL_HW_PARAMS: 3094 return snd_pcm_hw_params(substream, arg); 3095 case SNDRV_PCM_IOCTL_SW_PARAMS: 3096 return snd_pcm_sw_params(substream, arg); 3097 case SNDRV_PCM_IOCTL_PREPARE: 3098 return snd_pcm_prepare(substream, NULL); 3099 case SNDRV_PCM_IOCTL_START: 3100 return snd_pcm_start_lock_irq(substream); 3101 case SNDRV_PCM_IOCTL_DRAIN: 3102 return snd_pcm_drain(substream, NULL); 3103 case SNDRV_PCM_IOCTL_DROP: 3104 return snd_pcm_drop(substream); 3105 case SNDRV_PCM_IOCTL_DELAY: 3106 { 3107 result = snd_pcm_delay(substream); 3108 if (result < 0) 3109 return result; 3110 *frames = result; 3111 return 0; 3112 } 3113 default: 3114 return -EINVAL; 3115 } 3116 } 3117 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3118 3119 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3120 loff_t * offset) 3121 { 3122 struct snd_pcm_file *pcm_file; 3123 struct snd_pcm_substream *substream; 3124 struct snd_pcm_runtime *runtime; 3125 snd_pcm_sframes_t result; 3126 3127 pcm_file = file->private_data; 3128 substream = pcm_file->substream; 3129 if (PCM_RUNTIME_CHECK(substream)) 3130 return -ENXIO; 3131 runtime = substream->runtime; 3132 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3133 return -EBADFD; 3134 if (!frame_aligned(runtime, count)) 3135 return -EINVAL; 3136 count = bytes_to_frames(runtime, count); 3137 result = snd_pcm_lib_read(substream, buf, count); 3138 if (result > 0) 3139 result = frames_to_bytes(runtime, result); 3140 return result; 3141 } 3142 3143 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3144 size_t count, loff_t * offset) 3145 { 3146 struct snd_pcm_file *pcm_file; 3147 struct snd_pcm_substream *substream; 3148 struct snd_pcm_runtime *runtime; 3149 snd_pcm_sframes_t result; 3150 3151 pcm_file = file->private_data; 3152 substream = pcm_file->substream; 3153 if (PCM_RUNTIME_CHECK(substream)) 3154 return -ENXIO; 3155 runtime = substream->runtime; 3156 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3157 return -EBADFD; 3158 if (!frame_aligned(runtime, count)) 3159 return -EINVAL; 3160 count = bytes_to_frames(runtime, count); 3161 result = snd_pcm_lib_write(substream, buf, count); 3162 if (result > 0) 3163 result = frames_to_bytes(runtime, result); 3164 return result; 3165 } 3166 3167 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3168 { 3169 struct snd_pcm_file *pcm_file; 3170 struct snd_pcm_substream *substream; 3171 struct snd_pcm_runtime *runtime; 3172 snd_pcm_sframes_t result; 3173 unsigned long i; 3174 void __user **bufs; 3175 snd_pcm_uframes_t frames; 3176 3177 pcm_file = iocb->ki_filp->private_data; 3178 substream = pcm_file->substream; 3179 if (PCM_RUNTIME_CHECK(substream)) 3180 return -ENXIO; 3181 runtime = substream->runtime; 3182 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3183 return -EBADFD; 3184 if (!iter_is_iovec(to)) 3185 return -EINVAL; 3186 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3187 return -EINVAL; 3188 if (!frame_aligned(runtime, to->iov->iov_len)) 3189 return -EINVAL; 3190 frames = bytes_to_samples(runtime, to->iov->iov_len); 3191 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3192 if (bufs == NULL) 3193 return -ENOMEM; 3194 for (i = 0; i < to->nr_segs; ++i) 3195 bufs[i] = to->iov[i].iov_base; 3196 result = snd_pcm_lib_readv(substream, bufs, frames); 3197 if (result > 0) 3198 result = frames_to_bytes(runtime, result); 3199 kfree(bufs); 3200 return result; 3201 } 3202 3203 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3204 { 3205 struct snd_pcm_file *pcm_file; 3206 struct snd_pcm_substream *substream; 3207 struct snd_pcm_runtime *runtime; 3208 snd_pcm_sframes_t result; 3209 unsigned long i; 3210 void __user **bufs; 3211 snd_pcm_uframes_t frames; 3212 3213 pcm_file = iocb->ki_filp->private_data; 3214 substream = pcm_file->substream; 3215 if (PCM_RUNTIME_CHECK(substream)) 3216 return -ENXIO; 3217 runtime = substream->runtime; 3218 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3219 return -EBADFD; 3220 if (!iter_is_iovec(from)) 3221 return -EINVAL; 3222 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3223 !frame_aligned(runtime, from->iov->iov_len)) 3224 return -EINVAL; 3225 frames = bytes_to_samples(runtime, from->iov->iov_len); 3226 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3227 if (bufs == NULL) 3228 return -ENOMEM; 3229 for (i = 0; i < from->nr_segs; ++i) 3230 bufs[i] = from->iov[i].iov_base; 3231 result = snd_pcm_lib_writev(substream, bufs, frames); 3232 if (result > 0) 3233 result = frames_to_bytes(runtime, result); 3234 kfree(bufs); 3235 return result; 3236 } 3237 3238 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3239 { 3240 struct snd_pcm_file *pcm_file; 3241 struct snd_pcm_substream *substream; 3242 struct snd_pcm_runtime *runtime; 3243 unsigned int mask; 3244 snd_pcm_uframes_t avail; 3245 3246 pcm_file = file->private_data; 3247 3248 substream = pcm_file->substream; 3249 if (PCM_RUNTIME_CHECK(substream)) 3250 return POLLOUT | POLLWRNORM | POLLERR; 3251 runtime = substream->runtime; 3252 3253 poll_wait(file, &runtime->sleep, wait); 3254 3255 snd_pcm_stream_lock_irq(substream); 3256 avail = snd_pcm_playback_avail(runtime); 3257 switch (runtime->status->state) { 3258 case SNDRV_PCM_STATE_RUNNING: 3259 case SNDRV_PCM_STATE_PREPARED: 3260 case SNDRV_PCM_STATE_PAUSED: 3261 if (avail >= runtime->control->avail_min) { 3262 mask = POLLOUT | POLLWRNORM; 3263 break; 3264 } 3265 /* Fall through */ 3266 case SNDRV_PCM_STATE_DRAINING: 3267 mask = 0; 3268 break; 3269 default: 3270 mask = POLLOUT | POLLWRNORM | POLLERR; 3271 break; 3272 } 3273 snd_pcm_stream_unlock_irq(substream); 3274 return mask; 3275 } 3276 3277 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3278 { 3279 struct snd_pcm_file *pcm_file; 3280 struct snd_pcm_substream *substream; 3281 struct snd_pcm_runtime *runtime; 3282 unsigned int mask; 3283 snd_pcm_uframes_t avail; 3284 3285 pcm_file = file->private_data; 3286 3287 substream = pcm_file->substream; 3288 if (PCM_RUNTIME_CHECK(substream)) 3289 return POLLIN | POLLRDNORM | POLLERR; 3290 runtime = substream->runtime; 3291 3292 poll_wait(file, &runtime->sleep, wait); 3293 3294 snd_pcm_stream_lock_irq(substream); 3295 avail = snd_pcm_capture_avail(runtime); 3296 switch (runtime->status->state) { 3297 case SNDRV_PCM_STATE_RUNNING: 3298 case SNDRV_PCM_STATE_PREPARED: 3299 case SNDRV_PCM_STATE_PAUSED: 3300 if (avail >= runtime->control->avail_min) { 3301 mask = POLLIN | POLLRDNORM; 3302 break; 3303 } 3304 mask = 0; 3305 break; 3306 case SNDRV_PCM_STATE_DRAINING: 3307 if (avail > 0) { 3308 mask = POLLIN | POLLRDNORM; 3309 break; 3310 } 3311 /* Fall through */ 3312 default: 3313 mask = POLLIN | POLLRDNORM | POLLERR; 3314 break; 3315 } 3316 snd_pcm_stream_unlock_irq(substream); 3317 return mask; 3318 } 3319 3320 /* 3321 * mmap support 3322 */ 3323 3324 /* 3325 * Only on coherent architectures, we can mmap the status and the control records 3326 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3327 */ 3328 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3329 /* 3330 * mmap status record 3331 */ 3332 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3333 { 3334 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3335 struct snd_pcm_runtime *runtime; 3336 3337 if (substream == NULL) 3338 return VM_FAULT_SIGBUS; 3339 runtime = substream->runtime; 3340 vmf->page = virt_to_page(runtime->status); 3341 get_page(vmf->page); 3342 return 0; 3343 } 3344 3345 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3346 { 3347 .fault = snd_pcm_mmap_status_fault, 3348 }; 3349 3350 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3351 struct vm_area_struct *area) 3352 { 3353 long size; 3354 if (!(area->vm_flags & VM_READ)) 3355 return -EINVAL; 3356 size = area->vm_end - area->vm_start; 3357 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3358 return -EINVAL; 3359 area->vm_ops = &snd_pcm_vm_ops_status; 3360 area->vm_private_data = substream; 3361 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3362 return 0; 3363 } 3364 3365 /* 3366 * mmap control record 3367 */ 3368 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3369 { 3370 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3371 struct snd_pcm_runtime *runtime; 3372 3373 if (substream == NULL) 3374 return VM_FAULT_SIGBUS; 3375 runtime = substream->runtime; 3376 vmf->page = virt_to_page(runtime->control); 3377 get_page(vmf->page); 3378 return 0; 3379 } 3380 3381 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3382 { 3383 .fault = snd_pcm_mmap_control_fault, 3384 }; 3385 3386 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3387 struct vm_area_struct *area) 3388 { 3389 long size; 3390 if (!(area->vm_flags & VM_READ)) 3391 return -EINVAL; 3392 size = area->vm_end - area->vm_start; 3393 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3394 return -EINVAL; 3395 area->vm_ops = &snd_pcm_vm_ops_control; 3396 area->vm_private_data = substream; 3397 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3398 return 0; 3399 } 3400 #else /* ! coherent mmap */ 3401 /* 3402 * don't support mmap for status and control records. 3403 */ 3404 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3405 struct vm_area_struct *area) 3406 { 3407 return -ENXIO; 3408 } 3409 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3410 struct vm_area_struct *area) 3411 { 3412 return -ENXIO; 3413 } 3414 #endif /* coherent mmap */ 3415 3416 static inline struct page * 3417 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3418 { 3419 void *vaddr = substream->runtime->dma_area + ofs; 3420 return virt_to_page(vaddr); 3421 } 3422 3423 /* 3424 * fault callback for mmapping a RAM page 3425 */ 3426 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3427 { 3428 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3429 struct snd_pcm_runtime *runtime; 3430 unsigned long offset; 3431 struct page * page; 3432 size_t dma_bytes; 3433 3434 if (substream == NULL) 3435 return VM_FAULT_SIGBUS; 3436 runtime = substream->runtime; 3437 offset = vmf->pgoff << PAGE_SHIFT; 3438 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3439 if (offset > dma_bytes - PAGE_SIZE) 3440 return VM_FAULT_SIGBUS; 3441 if (substream->ops->page) 3442 page = substream->ops->page(substream, offset); 3443 else 3444 page = snd_pcm_default_page_ops(substream, offset); 3445 if (!page) 3446 return VM_FAULT_SIGBUS; 3447 get_page(page); 3448 vmf->page = page; 3449 return 0; 3450 } 3451 3452 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3453 .open = snd_pcm_mmap_data_open, 3454 .close = snd_pcm_mmap_data_close, 3455 }; 3456 3457 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3458 .open = snd_pcm_mmap_data_open, 3459 .close = snd_pcm_mmap_data_close, 3460 .fault = snd_pcm_mmap_data_fault, 3461 }; 3462 3463 /* 3464 * mmap the DMA buffer on RAM 3465 */ 3466 3467 /** 3468 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3469 * @substream: PCM substream 3470 * @area: VMA 3471 * 3472 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3473 * this function is invoked implicitly. 3474 */ 3475 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3476 struct vm_area_struct *area) 3477 { 3478 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3479 #ifdef CONFIG_GENERIC_ALLOCATOR 3480 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3481 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3482 return remap_pfn_range(area, area->vm_start, 3483 substream->dma_buffer.addr >> PAGE_SHIFT, 3484 area->vm_end - area->vm_start, area->vm_page_prot); 3485 } 3486 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3487 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3488 if (!substream->ops->page && 3489 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3490 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3491 area, 3492 substream->runtime->dma_area, 3493 substream->runtime->dma_addr, 3494 area->vm_end - area->vm_start); 3495 #endif /* CONFIG_X86 */ 3496 /* mmap with fault handler */ 3497 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3498 return 0; 3499 } 3500 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3501 3502 /* 3503 * mmap the DMA buffer on I/O memory area 3504 */ 3505 #if SNDRV_PCM_INFO_MMAP_IOMEM 3506 /** 3507 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3508 * @substream: PCM substream 3509 * @area: VMA 3510 * 3511 * When your hardware uses the iomapped pages as the hardware buffer and 3512 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3513 * is supposed to work only on limited architectures. 3514 */ 3515 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3516 struct vm_area_struct *area) 3517 { 3518 struct snd_pcm_runtime *runtime = substream->runtime;; 3519 3520 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3521 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3522 } 3523 3524 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3525 #endif /* SNDRV_PCM_INFO_MMAP */ 3526 3527 /* 3528 * mmap DMA buffer 3529 */ 3530 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3531 struct vm_area_struct *area) 3532 { 3533 struct snd_pcm_runtime *runtime; 3534 long size; 3535 unsigned long offset; 3536 size_t dma_bytes; 3537 int err; 3538 3539 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3540 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3541 return -EINVAL; 3542 } else { 3543 if (!(area->vm_flags & VM_READ)) 3544 return -EINVAL; 3545 } 3546 runtime = substream->runtime; 3547 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3548 return -EBADFD; 3549 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3550 return -ENXIO; 3551 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3552 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3553 return -EINVAL; 3554 size = area->vm_end - area->vm_start; 3555 offset = area->vm_pgoff << PAGE_SHIFT; 3556 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3557 if ((size_t)size > dma_bytes) 3558 return -EINVAL; 3559 if (offset > dma_bytes - size) 3560 return -EINVAL; 3561 3562 area->vm_ops = &snd_pcm_vm_ops_data; 3563 area->vm_private_data = substream; 3564 if (substream->ops->mmap) 3565 err = substream->ops->mmap(substream, area); 3566 else 3567 err = snd_pcm_lib_default_mmap(substream, area); 3568 if (!err) 3569 atomic_inc(&substream->mmap_count); 3570 return err; 3571 } 3572 3573 EXPORT_SYMBOL(snd_pcm_mmap_data); 3574 3575 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3576 { 3577 struct snd_pcm_file * pcm_file; 3578 struct snd_pcm_substream *substream; 3579 unsigned long offset; 3580 3581 pcm_file = file->private_data; 3582 substream = pcm_file->substream; 3583 if (PCM_RUNTIME_CHECK(substream)) 3584 return -ENXIO; 3585 3586 offset = area->vm_pgoff << PAGE_SHIFT; 3587 switch (offset) { 3588 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3589 if (pcm_file->no_compat_mmap) 3590 return -ENXIO; 3591 return snd_pcm_mmap_status(substream, file, area); 3592 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3593 if (pcm_file->no_compat_mmap) 3594 return -ENXIO; 3595 return snd_pcm_mmap_control(substream, file, area); 3596 default: 3597 return snd_pcm_mmap_data(substream, file, area); 3598 } 3599 return 0; 3600 } 3601 3602 static int snd_pcm_fasync(int fd, struct file * file, int on) 3603 { 3604 struct snd_pcm_file * pcm_file; 3605 struct snd_pcm_substream *substream; 3606 struct snd_pcm_runtime *runtime; 3607 3608 pcm_file = file->private_data; 3609 substream = pcm_file->substream; 3610 if (PCM_RUNTIME_CHECK(substream)) 3611 return -ENXIO; 3612 runtime = substream->runtime; 3613 return fasync_helper(fd, file, on, &runtime->fasync); 3614 } 3615 3616 /* 3617 * ioctl32 compat 3618 */ 3619 #ifdef CONFIG_COMPAT 3620 #include "pcm_compat.c" 3621 #else 3622 #define snd_pcm_ioctl_compat NULL 3623 #endif 3624 3625 /* 3626 * To be removed helpers to keep binary compatibility 3627 */ 3628 3629 #ifdef CONFIG_SND_SUPPORT_OLD_API 3630 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3631 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3632 3633 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3634 struct snd_pcm_hw_params_old *oparams) 3635 { 3636 unsigned int i; 3637 3638 memset(params, 0, sizeof(*params)); 3639 params->flags = oparams->flags; 3640 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3641 params->masks[i].bits[0] = oparams->masks[i]; 3642 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3643 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3644 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3645 params->info = oparams->info; 3646 params->msbits = oparams->msbits; 3647 params->rate_num = oparams->rate_num; 3648 params->rate_den = oparams->rate_den; 3649 params->fifo_size = oparams->fifo_size; 3650 } 3651 3652 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3653 struct snd_pcm_hw_params *params) 3654 { 3655 unsigned int i; 3656 3657 memset(oparams, 0, sizeof(*oparams)); 3658 oparams->flags = params->flags; 3659 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3660 oparams->masks[i] = params->masks[i].bits[0]; 3661 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3662 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3663 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3664 oparams->info = params->info; 3665 oparams->msbits = params->msbits; 3666 oparams->rate_num = params->rate_num; 3667 oparams->rate_den = params->rate_den; 3668 oparams->fifo_size = params->fifo_size; 3669 } 3670 3671 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3672 struct snd_pcm_hw_params_old __user * _oparams) 3673 { 3674 struct snd_pcm_hw_params *params; 3675 struct snd_pcm_hw_params_old *oparams = NULL; 3676 int err; 3677 3678 params = kmalloc(sizeof(*params), GFP_KERNEL); 3679 if (!params) 3680 return -ENOMEM; 3681 3682 oparams = memdup_user(_oparams, sizeof(*oparams)); 3683 if (IS_ERR(oparams)) { 3684 err = PTR_ERR(oparams); 3685 goto out; 3686 } 3687 snd_pcm_hw_convert_from_old_params(params, oparams); 3688 err = snd_pcm_hw_refine(substream, params); 3689 if (err < 0) 3690 goto out_old; 3691 3692 err = fixup_unreferenced_params(substream, params); 3693 if (err < 0) 3694 goto out_old; 3695 3696 snd_pcm_hw_convert_to_old_params(oparams, params); 3697 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3698 err = -EFAULT; 3699 out_old: 3700 kfree(oparams); 3701 out: 3702 kfree(params); 3703 return err; 3704 } 3705 3706 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3707 struct snd_pcm_hw_params_old __user * _oparams) 3708 { 3709 struct snd_pcm_hw_params *params; 3710 struct snd_pcm_hw_params_old *oparams = NULL; 3711 int err; 3712 3713 params = kmalloc(sizeof(*params), GFP_KERNEL); 3714 if (!params) 3715 return -ENOMEM; 3716 3717 oparams = memdup_user(_oparams, sizeof(*oparams)); 3718 if (IS_ERR(oparams)) { 3719 err = PTR_ERR(oparams); 3720 goto out; 3721 } 3722 3723 snd_pcm_hw_convert_from_old_params(params, oparams); 3724 err = snd_pcm_hw_params(substream, params); 3725 if (err < 0) 3726 goto out_old; 3727 3728 snd_pcm_hw_convert_to_old_params(oparams, params); 3729 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3730 err = -EFAULT; 3731 out_old: 3732 kfree(oparams); 3733 out: 3734 kfree(params); 3735 return err; 3736 } 3737 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3738 3739 #ifndef CONFIG_MMU 3740 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3741 unsigned long addr, 3742 unsigned long len, 3743 unsigned long pgoff, 3744 unsigned long flags) 3745 { 3746 struct snd_pcm_file *pcm_file = file->private_data; 3747 struct snd_pcm_substream *substream = pcm_file->substream; 3748 struct snd_pcm_runtime *runtime = substream->runtime; 3749 unsigned long offset = pgoff << PAGE_SHIFT; 3750 3751 switch (offset) { 3752 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3753 return (unsigned long)runtime->status; 3754 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3755 return (unsigned long)runtime->control; 3756 default: 3757 return (unsigned long)runtime->dma_area + offset; 3758 } 3759 } 3760 #else 3761 # define snd_pcm_get_unmapped_area NULL 3762 #endif 3763 3764 /* 3765 * Register section 3766 */ 3767 3768 const struct file_operations snd_pcm_f_ops[2] = { 3769 { 3770 .owner = THIS_MODULE, 3771 .write = snd_pcm_write, 3772 .write_iter = snd_pcm_writev, 3773 .open = snd_pcm_playback_open, 3774 .release = snd_pcm_release, 3775 .llseek = no_llseek, 3776 .poll = snd_pcm_playback_poll, 3777 .unlocked_ioctl = snd_pcm_playback_ioctl, 3778 .compat_ioctl = snd_pcm_ioctl_compat, 3779 .mmap = snd_pcm_mmap, 3780 .fasync = snd_pcm_fasync, 3781 .get_unmapped_area = snd_pcm_get_unmapped_area, 3782 }, 3783 { 3784 .owner = THIS_MODULE, 3785 .read = snd_pcm_read, 3786 .read_iter = snd_pcm_readv, 3787 .open = snd_pcm_capture_open, 3788 .release = snd_pcm_release, 3789 .llseek = no_llseek, 3790 .poll = snd_pcm_capture_poll, 3791 .unlocked_ioctl = snd_pcm_capture_ioctl, 3792 .compat_ioctl = snd_pcm_ioctl_compat, 3793 .mmap = snd_pcm_mmap, 3794 .fasync = snd_pcm_fasync, 3795 .get_unmapped_area = snd_pcm_get_unmapped_area, 3796 } 3797 }; 3798