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 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1544 } 1545 1546 #else 1547 1548 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1549 { 1550 return -ENOSYS; 1551 } 1552 1553 #endif /* CONFIG_PM */ 1554 1555 /* 1556 * xrun ioctl 1557 * 1558 * Change the RUNNING stream(s) to XRUN state. 1559 */ 1560 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1561 { 1562 struct snd_pcm_runtime *runtime = substream->runtime; 1563 int result; 1564 1565 snd_pcm_stream_lock_irq(substream); 1566 switch (runtime->status->state) { 1567 case SNDRV_PCM_STATE_XRUN: 1568 result = 0; /* already there */ 1569 break; 1570 case SNDRV_PCM_STATE_RUNNING: 1571 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1572 break; 1573 default: 1574 result = -EBADFD; 1575 } 1576 snd_pcm_stream_unlock_irq(substream); 1577 return result; 1578 } 1579 1580 /* 1581 * reset ioctl 1582 */ 1583 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1584 { 1585 struct snd_pcm_runtime *runtime = substream->runtime; 1586 switch (runtime->status->state) { 1587 case SNDRV_PCM_STATE_RUNNING: 1588 case SNDRV_PCM_STATE_PREPARED: 1589 case SNDRV_PCM_STATE_PAUSED: 1590 case SNDRV_PCM_STATE_SUSPENDED: 1591 return 0; 1592 default: 1593 return -EBADFD; 1594 } 1595 } 1596 1597 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1598 { 1599 struct snd_pcm_runtime *runtime = substream->runtime; 1600 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1601 if (err < 0) 1602 return err; 1603 runtime->hw_ptr_base = 0; 1604 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1605 runtime->status->hw_ptr % runtime->period_size; 1606 runtime->silence_start = runtime->status->hw_ptr; 1607 runtime->silence_filled = 0; 1608 return 0; 1609 } 1610 1611 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1612 { 1613 struct snd_pcm_runtime *runtime = substream->runtime; 1614 runtime->control->appl_ptr = runtime->status->hw_ptr; 1615 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1616 runtime->silence_size > 0) 1617 snd_pcm_playback_silence(substream, ULONG_MAX); 1618 } 1619 1620 static const struct action_ops snd_pcm_action_reset = { 1621 .pre_action = snd_pcm_pre_reset, 1622 .do_action = snd_pcm_do_reset, 1623 .post_action = snd_pcm_post_reset 1624 }; 1625 1626 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1627 { 1628 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1629 } 1630 1631 /* 1632 * prepare ioctl 1633 */ 1634 /* we use the second argument for updating f_flags */ 1635 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1636 int f_flags) 1637 { 1638 struct snd_pcm_runtime *runtime = substream->runtime; 1639 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1640 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1641 return -EBADFD; 1642 if (snd_pcm_running(substream)) 1643 return -EBUSY; 1644 substream->f_flags = f_flags; 1645 return 0; 1646 } 1647 1648 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1649 { 1650 int err; 1651 err = substream->ops->prepare(substream); 1652 if (err < 0) 1653 return err; 1654 return snd_pcm_do_reset(substream, 0); 1655 } 1656 1657 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1658 { 1659 struct snd_pcm_runtime *runtime = substream->runtime; 1660 runtime->control->appl_ptr = runtime->status->hw_ptr; 1661 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1662 } 1663 1664 static const struct action_ops snd_pcm_action_prepare = { 1665 .pre_action = snd_pcm_pre_prepare, 1666 .do_action = snd_pcm_do_prepare, 1667 .post_action = snd_pcm_post_prepare 1668 }; 1669 1670 /** 1671 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1672 * @substream: the PCM substream instance 1673 * @file: file to refer f_flags 1674 * 1675 * Return: Zero if successful, or a negative error code. 1676 */ 1677 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1678 struct file *file) 1679 { 1680 int f_flags; 1681 1682 if (file) 1683 f_flags = file->f_flags; 1684 else 1685 f_flags = substream->f_flags; 1686 1687 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1688 substream, f_flags); 1689 } 1690 1691 /* 1692 * drain ioctl 1693 */ 1694 1695 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1696 { 1697 struct snd_pcm_runtime *runtime = substream->runtime; 1698 switch (runtime->status->state) { 1699 case SNDRV_PCM_STATE_OPEN: 1700 case SNDRV_PCM_STATE_DISCONNECTED: 1701 case SNDRV_PCM_STATE_SUSPENDED: 1702 return -EBADFD; 1703 } 1704 runtime->trigger_master = substream; 1705 return 0; 1706 } 1707 1708 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1709 { 1710 struct snd_pcm_runtime *runtime = substream->runtime; 1711 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1712 switch (runtime->status->state) { 1713 case SNDRV_PCM_STATE_PREPARED: 1714 /* start playback stream if possible */ 1715 if (! snd_pcm_playback_empty(substream)) { 1716 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1717 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1718 } else { 1719 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1720 } 1721 break; 1722 case SNDRV_PCM_STATE_RUNNING: 1723 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1724 break; 1725 case SNDRV_PCM_STATE_XRUN: 1726 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1727 break; 1728 default: 1729 break; 1730 } 1731 } else { 1732 /* stop running stream */ 1733 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1734 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1735 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1736 snd_pcm_do_stop(substream, new_state); 1737 snd_pcm_post_stop(substream, new_state); 1738 } 1739 } 1740 1741 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1742 runtime->trigger_master == substream && 1743 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1744 return substream->ops->trigger(substream, 1745 SNDRV_PCM_TRIGGER_DRAIN); 1746 1747 return 0; 1748 } 1749 1750 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1751 { 1752 } 1753 1754 static const struct action_ops snd_pcm_action_drain_init = { 1755 .pre_action = snd_pcm_pre_drain_init, 1756 .do_action = snd_pcm_do_drain_init, 1757 .post_action = snd_pcm_post_drain_init 1758 }; 1759 1760 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1761 1762 /* 1763 * Drain the stream(s). 1764 * When the substream is linked, sync until the draining of all playback streams 1765 * is finished. 1766 * After this call, all streams are supposed to be either SETUP or DRAINING 1767 * (capture only) state. 1768 */ 1769 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1770 struct file *file) 1771 { 1772 struct snd_card *card; 1773 struct snd_pcm_runtime *runtime; 1774 struct snd_pcm_substream *s; 1775 wait_queue_t wait; 1776 int result = 0; 1777 int nonblock = 0; 1778 1779 card = substream->pcm->card; 1780 runtime = substream->runtime; 1781 1782 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1783 return -EBADFD; 1784 1785 if (file) { 1786 if (file->f_flags & O_NONBLOCK) 1787 nonblock = 1; 1788 } else if (substream->f_flags & O_NONBLOCK) 1789 nonblock = 1; 1790 1791 down_read(&snd_pcm_link_rwsem); 1792 snd_pcm_stream_lock_irq(substream); 1793 /* resume pause */ 1794 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1795 snd_pcm_pause(substream, 0); 1796 1797 /* pre-start/stop - all running streams are changed to DRAINING state */ 1798 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1799 if (result < 0) 1800 goto unlock; 1801 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1802 if (nonblock) { 1803 result = -EAGAIN; 1804 goto unlock; 1805 } 1806 1807 for (;;) { 1808 long tout; 1809 struct snd_pcm_runtime *to_check; 1810 if (signal_pending(current)) { 1811 result = -ERESTARTSYS; 1812 break; 1813 } 1814 /* find a substream to drain */ 1815 to_check = NULL; 1816 snd_pcm_group_for_each_entry(s, substream) { 1817 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1818 continue; 1819 runtime = s->runtime; 1820 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1821 to_check = runtime; 1822 break; 1823 } 1824 } 1825 if (!to_check) 1826 break; /* all drained */ 1827 init_waitqueue_entry(&wait, current); 1828 add_wait_queue(&to_check->sleep, &wait); 1829 snd_pcm_stream_unlock_irq(substream); 1830 up_read(&snd_pcm_link_rwsem); 1831 snd_power_unlock(card); 1832 if (runtime->no_period_wakeup) 1833 tout = MAX_SCHEDULE_TIMEOUT; 1834 else { 1835 tout = 10; 1836 if (runtime->rate) { 1837 long t = runtime->period_size * 2 / runtime->rate; 1838 tout = max(t, tout); 1839 } 1840 tout = msecs_to_jiffies(tout * 1000); 1841 } 1842 tout = schedule_timeout_interruptible(tout); 1843 snd_power_lock(card); 1844 down_read(&snd_pcm_link_rwsem); 1845 snd_pcm_stream_lock_irq(substream); 1846 remove_wait_queue(&to_check->sleep, &wait); 1847 if (card->shutdown) { 1848 result = -ENODEV; 1849 break; 1850 } 1851 if (tout == 0) { 1852 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1853 result = -ESTRPIPE; 1854 else { 1855 dev_dbg(substream->pcm->card->dev, 1856 "playback drain error (DMA or IRQ trouble?)\n"); 1857 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1858 result = -EIO; 1859 } 1860 break; 1861 } 1862 } 1863 1864 unlock: 1865 snd_pcm_stream_unlock_irq(substream); 1866 up_read(&snd_pcm_link_rwsem); 1867 1868 return result; 1869 } 1870 1871 /* 1872 * drop ioctl 1873 * 1874 * Immediately put all linked substreams into SETUP state. 1875 */ 1876 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1877 { 1878 struct snd_pcm_runtime *runtime; 1879 int result = 0; 1880 1881 if (PCM_RUNTIME_CHECK(substream)) 1882 return -ENXIO; 1883 runtime = substream->runtime; 1884 1885 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1886 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1887 return -EBADFD; 1888 1889 snd_pcm_stream_lock_irq(substream); 1890 /* resume pause */ 1891 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1892 snd_pcm_pause(substream, 0); 1893 1894 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1895 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1896 snd_pcm_stream_unlock_irq(substream); 1897 1898 return result; 1899 } 1900 1901 1902 static bool is_pcm_file(struct file *file) 1903 { 1904 struct inode *inode = file_inode(file); 1905 unsigned int minor; 1906 1907 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1908 return false; 1909 minor = iminor(inode); 1910 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1911 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1912 } 1913 1914 /* 1915 * PCM link handling 1916 */ 1917 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1918 { 1919 int res = 0; 1920 struct snd_pcm_file *pcm_file; 1921 struct snd_pcm_substream *substream1; 1922 struct snd_pcm_group *group; 1923 struct fd f = fdget(fd); 1924 1925 if (!f.file) 1926 return -EBADFD; 1927 if (!is_pcm_file(f.file)) { 1928 res = -EBADFD; 1929 goto _badf; 1930 } 1931 pcm_file = f.file->private_data; 1932 substream1 = pcm_file->substream; 1933 group = kmalloc(sizeof(*group), GFP_KERNEL); 1934 if (!group) { 1935 res = -ENOMEM; 1936 goto _nolock; 1937 } 1938 down_write_nonblock(&snd_pcm_link_rwsem); 1939 write_lock_irq(&snd_pcm_link_rwlock); 1940 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1941 substream->runtime->status->state != substream1->runtime->status->state || 1942 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1943 res = -EBADFD; 1944 goto _end; 1945 } 1946 if (snd_pcm_stream_linked(substream1)) { 1947 res = -EALREADY; 1948 goto _end; 1949 } 1950 if (!snd_pcm_stream_linked(substream)) { 1951 substream->group = group; 1952 group = NULL; 1953 spin_lock_init(&substream->group->lock); 1954 mutex_init(&substream->group->mutex); 1955 INIT_LIST_HEAD(&substream->group->substreams); 1956 list_add_tail(&substream->link_list, &substream->group->substreams); 1957 substream->group->count = 1; 1958 } 1959 list_add_tail(&substream1->link_list, &substream->group->substreams); 1960 substream->group->count++; 1961 substream1->group = substream->group; 1962 _end: 1963 write_unlock_irq(&snd_pcm_link_rwlock); 1964 up_write(&snd_pcm_link_rwsem); 1965 _nolock: 1966 snd_card_unref(substream1->pcm->card); 1967 kfree(group); 1968 _badf: 1969 fdput(f); 1970 return res; 1971 } 1972 1973 static void relink_to_local(struct snd_pcm_substream *substream) 1974 { 1975 substream->group = &substream->self_group; 1976 INIT_LIST_HEAD(&substream->self_group.substreams); 1977 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1978 } 1979 1980 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1981 { 1982 struct snd_pcm_substream *s; 1983 int res = 0; 1984 1985 down_write_nonblock(&snd_pcm_link_rwsem); 1986 write_lock_irq(&snd_pcm_link_rwlock); 1987 if (!snd_pcm_stream_linked(substream)) { 1988 res = -EALREADY; 1989 goto _end; 1990 } 1991 list_del(&substream->link_list); 1992 substream->group->count--; 1993 if (substream->group->count == 1) { /* detach the last stream, too */ 1994 snd_pcm_group_for_each_entry(s, substream) { 1995 relink_to_local(s); 1996 break; 1997 } 1998 kfree(substream->group); 1999 } 2000 relink_to_local(substream); 2001 _end: 2002 write_unlock_irq(&snd_pcm_link_rwlock); 2003 up_write(&snd_pcm_link_rwsem); 2004 return res; 2005 } 2006 2007 /* 2008 * hw configurator 2009 */ 2010 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2011 struct snd_pcm_hw_rule *rule) 2012 { 2013 struct snd_interval t; 2014 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2015 hw_param_interval_c(params, rule->deps[1]), &t); 2016 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2017 } 2018 2019 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2020 struct snd_pcm_hw_rule *rule) 2021 { 2022 struct snd_interval t; 2023 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2024 hw_param_interval_c(params, rule->deps[1]), &t); 2025 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2026 } 2027 2028 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2029 struct snd_pcm_hw_rule *rule) 2030 { 2031 struct snd_interval t; 2032 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2033 hw_param_interval_c(params, rule->deps[1]), 2034 (unsigned long) rule->private, &t); 2035 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2036 } 2037 2038 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2039 struct snd_pcm_hw_rule *rule) 2040 { 2041 struct snd_interval t; 2042 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2043 (unsigned long) rule->private, 2044 hw_param_interval_c(params, rule->deps[1]), &t); 2045 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2046 } 2047 2048 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2049 struct snd_pcm_hw_rule *rule) 2050 { 2051 unsigned int k; 2052 const struct snd_interval *i = 2053 hw_param_interval_c(params, rule->deps[0]); 2054 struct snd_mask m; 2055 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2056 snd_mask_any(&m); 2057 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2058 int bits; 2059 if (! snd_mask_test(mask, k)) 2060 continue; 2061 bits = snd_pcm_format_physical_width(k); 2062 if (bits <= 0) 2063 continue; /* ignore invalid formats */ 2064 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2065 snd_mask_reset(&m, k); 2066 } 2067 return snd_mask_refine(mask, &m); 2068 } 2069 2070 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2071 struct snd_pcm_hw_rule *rule) 2072 { 2073 struct snd_interval t; 2074 unsigned int k; 2075 t.min = UINT_MAX; 2076 t.max = 0; 2077 t.openmin = 0; 2078 t.openmax = 0; 2079 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2080 int bits; 2081 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2082 continue; 2083 bits = snd_pcm_format_physical_width(k); 2084 if (bits <= 0) 2085 continue; /* ignore invalid formats */ 2086 if (t.min > (unsigned)bits) 2087 t.min = bits; 2088 if (t.max < (unsigned)bits) 2089 t.max = bits; 2090 } 2091 t.integer = 1; 2092 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2093 } 2094 2095 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2096 #error "Change this table" 2097 #endif 2098 2099 static const unsigned int rates[] = { 2100 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2101 48000, 64000, 88200, 96000, 176400, 192000 2102 }; 2103 2104 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2105 .count = ARRAY_SIZE(rates), 2106 .list = rates, 2107 }; 2108 2109 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2110 struct snd_pcm_hw_rule *rule) 2111 { 2112 struct snd_pcm_hardware *hw = rule->private; 2113 return snd_interval_list(hw_param_interval(params, rule->var), 2114 snd_pcm_known_rates.count, 2115 snd_pcm_known_rates.list, hw->rates); 2116 } 2117 2118 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2119 struct snd_pcm_hw_rule *rule) 2120 { 2121 struct snd_interval t; 2122 struct snd_pcm_substream *substream = rule->private; 2123 t.min = 0; 2124 t.max = substream->buffer_bytes_max; 2125 t.openmin = 0; 2126 t.openmax = 0; 2127 t.integer = 1; 2128 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2129 } 2130 2131 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2132 { 2133 struct snd_pcm_runtime *runtime = substream->runtime; 2134 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2135 int k, err; 2136 2137 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2138 snd_mask_any(constrs_mask(constrs, k)); 2139 } 2140 2141 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2142 snd_interval_any(constrs_interval(constrs, k)); 2143 } 2144 2145 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2146 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2147 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2148 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2149 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2150 2151 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2152 snd_pcm_hw_rule_format, NULL, 2153 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2154 if (err < 0) 2155 return err; 2156 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2157 snd_pcm_hw_rule_sample_bits, NULL, 2158 SNDRV_PCM_HW_PARAM_FORMAT, 2159 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2160 if (err < 0) 2161 return err; 2162 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2163 snd_pcm_hw_rule_div, NULL, 2164 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2165 if (err < 0) 2166 return err; 2167 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2168 snd_pcm_hw_rule_mul, NULL, 2169 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2170 if (err < 0) 2171 return err; 2172 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2173 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2174 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2175 if (err < 0) 2176 return err; 2177 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2178 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2179 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2180 if (err < 0) 2181 return err; 2182 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2183 snd_pcm_hw_rule_div, NULL, 2184 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2185 if (err < 0) 2186 return err; 2187 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2188 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2189 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2190 if (err < 0) 2191 return err; 2192 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2193 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2194 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2195 if (err < 0) 2196 return err; 2197 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2198 snd_pcm_hw_rule_div, NULL, 2199 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2200 if (err < 0) 2201 return err; 2202 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2203 snd_pcm_hw_rule_div, NULL, 2204 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2205 if (err < 0) 2206 return err; 2207 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2208 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2209 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2210 if (err < 0) 2211 return err; 2212 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2213 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2214 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2215 if (err < 0) 2216 return err; 2217 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2218 snd_pcm_hw_rule_mul, NULL, 2219 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2220 if (err < 0) 2221 return err; 2222 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2223 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2224 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2225 if (err < 0) 2226 return err; 2227 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2228 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2229 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2230 if (err < 0) 2231 return err; 2232 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2233 snd_pcm_hw_rule_muldivk, (void*) 8, 2234 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2235 if (err < 0) 2236 return err; 2237 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2238 snd_pcm_hw_rule_muldivk, (void*) 8, 2239 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2240 if (err < 0) 2241 return err; 2242 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2243 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2244 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2245 if (err < 0) 2246 return err; 2247 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2248 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2249 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2250 if (err < 0) 2251 return err; 2252 return 0; 2253 } 2254 2255 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2256 { 2257 struct snd_pcm_runtime *runtime = substream->runtime; 2258 struct snd_pcm_hardware *hw = &runtime->hw; 2259 int err; 2260 unsigned int mask = 0; 2261 2262 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2263 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2264 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2265 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2266 if (hw_support_mmap(substream)) { 2267 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2268 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2269 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2270 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2271 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2272 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2273 } 2274 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2275 if (err < 0) 2276 return err; 2277 2278 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2279 if (err < 0) 2280 return err; 2281 2282 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2283 if (err < 0) 2284 return err; 2285 2286 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2287 hw->channels_min, hw->channels_max); 2288 if (err < 0) 2289 return err; 2290 2291 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2292 hw->rate_min, hw->rate_max); 2293 if (err < 0) 2294 return err; 2295 2296 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2297 hw->period_bytes_min, hw->period_bytes_max); 2298 if (err < 0) 2299 return err; 2300 2301 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2302 hw->periods_min, hw->periods_max); 2303 if (err < 0) 2304 return err; 2305 2306 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2307 hw->period_bytes_min, hw->buffer_bytes_max); 2308 if (err < 0) 2309 return err; 2310 2311 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2312 snd_pcm_hw_rule_buffer_bytes_max, substream, 2313 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2314 if (err < 0) 2315 return err; 2316 2317 /* FIXME: remove */ 2318 if (runtime->dma_bytes) { 2319 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2320 if (err < 0) 2321 return err; 2322 } 2323 2324 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2325 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2326 snd_pcm_hw_rule_rate, hw, 2327 SNDRV_PCM_HW_PARAM_RATE, -1); 2328 if (err < 0) 2329 return err; 2330 } 2331 2332 /* FIXME: this belong to lowlevel */ 2333 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2334 2335 return 0; 2336 } 2337 2338 static void pcm_release_private(struct snd_pcm_substream *substream) 2339 { 2340 snd_pcm_unlink(substream); 2341 } 2342 2343 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2344 { 2345 substream->ref_count--; 2346 if (substream->ref_count > 0) 2347 return; 2348 2349 snd_pcm_drop(substream); 2350 if (substream->hw_opened) { 2351 if (substream->ops->hw_free && 2352 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2353 substream->ops->hw_free(substream); 2354 substream->ops->close(substream); 2355 substream->hw_opened = 0; 2356 } 2357 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2358 pm_qos_remove_request(&substream->latency_pm_qos_req); 2359 if (substream->pcm_release) { 2360 substream->pcm_release(substream); 2361 substream->pcm_release = NULL; 2362 } 2363 snd_pcm_detach_substream(substream); 2364 } 2365 2366 EXPORT_SYMBOL(snd_pcm_release_substream); 2367 2368 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2369 struct file *file, 2370 struct snd_pcm_substream **rsubstream) 2371 { 2372 struct snd_pcm_substream *substream; 2373 int err; 2374 2375 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2376 if (err < 0) 2377 return err; 2378 if (substream->ref_count > 1) { 2379 *rsubstream = substream; 2380 return 0; 2381 } 2382 2383 err = snd_pcm_hw_constraints_init(substream); 2384 if (err < 0) { 2385 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2386 goto error; 2387 } 2388 2389 if ((err = substream->ops->open(substream)) < 0) 2390 goto error; 2391 2392 substream->hw_opened = 1; 2393 2394 err = snd_pcm_hw_constraints_complete(substream); 2395 if (err < 0) { 2396 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2397 goto error; 2398 } 2399 2400 *rsubstream = substream; 2401 return 0; 2402 2403 error: 2404 snd_pcm_release_substream(substream); 2405 return err; 2406 } 2407 2408 EXPORT_SYMBOL(snd_pcm_open_substream); 2409 2410 static int snd_pcm_open_file(struct file *file, 2411 struct snd_pcm *pcm, 2412 int stream) 2413 { 2414 struct snd_pcm_file *pcm_file; 2415 struct snd_pcm_substream *substream; 2416 int err; 2417 2418 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2419 if (err < 0) 2420 return err; 2421 2422 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2423 if (pcm_file == NULL) { 2424 snd_pcm_release_substream(substream); 2425 return -ENOMEM; 2426 } 2427 pcm_file->substream = substream; 2428 if (substream->ref_count == 1) { 2429 substream->file = pcm_file; 2430 substream->pcm_release = pcm_release_private; 2431 } 2432 file->private_data = pcm_file; 2433 2434 return 0; 2435 } 2436 2437 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2438 { 2439 struct snd_pcm *pcm; 2440 int err = nonseekable_open(inode, file); 2441 if (err < 0) 2442 return err; 2443 pcm = snd_lookup_minor_data(iminor(inode), 2444 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2445 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2446 if (pcm) 2447 snd_card_unref(pcm->card); 2448 return err; 2449 } 2450 2451 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2452 { 2453 struct snd_pcm *pcm; 2454 int err = nonseekable_open(inode, file); 2455 if (err < 0) 2456 return err; 2457 pcm = snd_lookup_minor_data(iminor(inode), 2458 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2459 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2460 if (pcm) 2461 snd_card_unref(pcm->card); 2462 return err; 2463 } 2464 2465 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2466 { 2467 int err; 2468 wait_queue_t wait; 2469 2470 if (pcm == NULL) { 2471 err = -ENODEV; 2472 goto __error1; 2473 } 2474 err = snd_card_file_add(pcm->card, file); 2475 if (err < 0) 2476 goto __error1; 2477 if (!try_module_get(pcm->card->module)) { 2478 err = -EFAULT; 2479 goto __error2; 2480 } 2481 init_waitqueue_entry(&wait, current); 2482 add_wait_queue(&pcm->open_wait, &wait); 2483 mutex_lock(&pcm->open_mutex); 2484 while (1) { 2485 err = snd_pcm_open_file(file, pcm, stream); 2486 if (err >= 0) 2487 break; 2488 if (err == -EAGAIN) { 2489 if (file->f_flags & O_NONBLOCK) { 2490 err = -EBUSY; 2491 break; 2492 } 2493 } else 2494 break; 2495 set_current_state(TASK_INTERRUPTIBLE); 2496 mutex_unlock(&pcm->open_mutex); 2497 schedule(); 2498 mutex_lock(&pcm->open_mutex); 2499 if (pcm->card->shutdown) { 2500 err = -ENODEV; 2501 break; 2502 } 2503 if (signal_pending(current)) { 2504 err = -ERESTARTSYS; 2505 break; 2506 } 2507 } 2508 remove_wait_queue(&pcm->open_wait, &wait); 2509 mutex_unlock(&pcm->open_mutex); 2510 if (err < 0) 2511 goto __error; 2512 return err; 2513 2514 __error: 2515 module_put(pcm->card->module); 2516 __error2: 2517 snd_card_file_remove(pcm->card, file); 2518 __error1: 2519 return err; 2520 } 2521 2522 static int snd_pcm_release(struct inode *inode, struct file *file) 2523 { 2524 struct snd_pcm *pcm; 2525 struct snd_pcm_substream *substream; 2526 struct snd_pcm_file *pcm_file; 2527 2528 pcm_file = file->private_data; 2529 substream = pcm_file->substream; 2530 if (snd_BUG_ON(!substream)) 2531 return -ENXIO; 2532 pcm = substream->pcm; 2533 mutex_lock(&pcm->open_mutex); 2534 snd_pcm_release_substream(substream); 2535 kfree(pcm_file); 2536 mutex_unlock(&pcm->open_mutex); 2537 wake_up(&pcm->open_wait); 2538 module_put(pcm->card->module); 2539 snd_card_file_remove(pcm->card, file); 2540 return 0; 2541 } 2542 2543 /* check and update PCM state; return 0 or a negative error 2544 * call this inside PCM lock 2545 */ 2546 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2547 { 2548 switch (substream->runtime->status->state) { 2549 case SNDRV_PCM_STATE_DRAINING: 2550 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2551 return -EBADFD; 2552 /* Fall through */ 2553 case SNDRV_PCM_STATE_RUNNING: 2554 return snd_pcm_update_hw_ptr(substream); 2555 case SNDRV_PCM_STATE_PREPARED: 2556 case SNDRV_PCM_STATE_PAUSED: 2557 return 0; 2558 case SNDRV_PCM_STATE_SUSPENDED: 2559 return -ESTRPIPE; 2560 case SNDRV_PCM_STATE_XRUN: 2561 return -EPIPE; 2562 default: 2563 return -EBADFD; 2564 } 2565 } 2566 2567 /* increase the appl_ptr; returns the processed frames or a negative error */ 2568 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2569 snd_pcm_uframes_t frames, 2570 snd_pcm_sframes_t avail) 2571 { 2572 struct snd_pcm_runtime *runtime = substream->runtime; 2573 snd_pcm_sframes_t appl_ptr; 2574 int ret; 2575 2576 if (avail <= 0) 2577 return 0; 2578 if (frames > (snd_pcm_uframes_t)avail) 2579 frames = avail; 2580 appl_ptr = runtime->control->appl_ptr + frames; 2581 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2582 appl_ptr -= runtime->boundary; 2583 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2584 return ret < 0 ? ret : frames; 2585 } 2586 2587 /* decrease the appl_ptr; returns the processed frames or a negative error */ 2588 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2589 snd_pcm_uframes_t frames, 2590 snd_pcm_sframes_t avail) 2591 { 2592 struct snd_pcm_runtime *runtime = substream->runtime; 2593 snd_pcm_sframes_t appl_ptr; 2594 int ret; 2595 2596 if (avail <= 0) 2597 return 0; 2598 if (frames > (snd_pcm_uframes_t)avail) 2599 frames = avail; 2600 appl_ptr = runtime->control->appl_ptr - frames; 2601 if (appl_ptr < 0) 2602 appl_ptr += runtime->boundary; 2603 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2604 return ret < 0 ? ret : frames; 2605 } 2606 2607 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2608 snd_pcm_uframes_t frames) 2609 { 2610 struct snd_pcm_runtime *runtime = substream->runtime; 2611 snd_pcm_sframes_t ret; 2612 2613 if (frames == 0) 2614 return 0; 2615 2616 snd_pcm_stream_lock_irq(substream); 2617 ret = do_pcm_hwsync(substream); 2618 if (!ret) 2619 ret = rewind_appl_ptr(substream, frames, 2620 snd_pcm_playback_hw_avail(runtime)); 2621 snd_pcm_stream_unlock_irq(substream); 2622 return ret; 2623 } 2624 2625 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2626 snd_pcm_uframes_t frames) 2627 { 2628 struct snd_pcm_runtime *runtime = substream->runtime; 2629 snd_pcm_sframes_t ret; 2630 2631 if (frames == 0) 2632 return 0; 2633 2634 snd_pcm_stream_lock_irq(substream); 2635 ret = do_pcm_hwsync(substream); 2636 if (!ret) 2637 ret = rewind_appl_ptr(substream, frames, 2638 snd_pcm_capture_hw_avail(runtime)); 2639 snd_pcm_stream_unlock_irq(substream); 2640 return ret; 2641 } 2642 2643 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2644 snd_pcm_uframes_t frames) 2645 { 2646 struct snd_pcm_runtime *runtime = substream->runtime; 2647 snd_pcm_sframes_t ret; 2648 2649 if (frames == 0) 2650 return 0; 2651 2652 snd_pcm_stream_lock_irq(substream); 2653 ret = do_pcm_hwsync(substream); 2654 if (!ret) 2655 ret = forward_appl_ptr(substream, frames, 2656 snd_pcm_playback_avail(runtime)); 2657 snd_pcm_stream_unlock_irq(substream); 2658 return ret; 2659 } 2660 2661 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2662 snd_pcm_uframes_t frames) 2663 { 2664 struct snd_pcm_runtime *runtime = substream->runtime; 2665 snd_pcm_sframes_t ret; 2666 2667 if (frames == 0) 2668 return 0; 2669 2670 snd_pcm_stream_lock_irq(substream); 2671 ret = do_pcm_hwsync(substream); 2672 if (!ret) 2673 ret = forward_appl_ptr(substream, frames, 2674 snd_pcm_capture_avail(runtime)); 2675 snd_pcm_stream_unlock_irq(substream); 2676 return ret; 2677 } 2678 2679 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2680 { 2681 int err; 2682 2683 snd_pcm_stream_lock_irq(substream); 2684 err = do_pcm_hwsync(substream); 2685 snd_pcm_stream_unlock_irq(substream); 2686 return err; 2687 } 2688 2689 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream) 2690 { 2691 struct snd_pcm_runtime *runtime = substream->runtime; 2692 int err; 2693 snd_pcm_sframes_t n = 0; 2694 2695 snd_pcm_stream_lock_irq(substream); 2696 err = do_pcm_hwsync(substream); 2697 if (!err) { 2698 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2699 n = snd_pcm_playback_hw_avail(runtime); 2700 else 2701 n = snd_pcm_capture_avail(runtime); 2702 n += runtime->delay; 2703 } 2704 snd_pcm_stream_unlock_irq(substream); 2705 return err < 0 ? err : n; 2706 } 2707 2708 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2709 struct snd_pcm_sync_ptr __user *_sync_ptr) 2710 { 2711 struct snd_pcm_runtime *runtime = substream->runtime; 2712 struct snd_pcm_sync_ptr sync_ptr; 2713 volatile struct snd_pcm_mmap_status *status; 2714 volatile struct snd_pcm_mmap_control *control; 2715 int err; 2716 2717 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2718 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2719 return -EFAULT; 2720 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2721 return -EFAULT; 2722 status = runtime->status; 2723 control = runtime->control; 2724 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2725 err = snd_pcm_hwsync(substream); 2726 if (err < 0) 2727 return err; 2728 } 2729 snd_pcm_stream_lock_irq(substream); 2730 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2731 err = pcm_lib_apply_appl_ptr(substream, 2732 sync_ptr.c.control.appl_ptr); 2733 if (err < 0) { 2734 snd_pcm_stream_unlock_irq(substream); 2735 return err; 2736 } 2737 } else { 2738 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2739 } 2740 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2741 control->avail_min = sync_ptr.c.control.avail_min; 2742 else 2743 sync_ptr.c.control.avail_min = control->avail_min; 2744 sync_ptr.s.status.state = status->state; 2745 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2746 sync_ptr.s.status.tstamp = status->tstamp; 2747 sync_ptr.s.status.suspended_state = status->suspended_state; 2748 snd_pcm_stream_unlock_irq(substream); 2749 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2750 return -EFAULT; 2751 return 0; 2752 } 2753 2754 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2755 { 2756 struct snd_pcm_runtime *runtime = substream->runtime; 2757 int arg; 2758 2759 if (get_user(arg, _arg)) 2760 return -EFAULT; 2761 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2762 return -EINVAL; 2763 runtime->tstamp_type = arg; 2764 return 0; 2765 } 2766 2767 static int snd_pcm_common_ioctl(struct file *file, 2768 struct snd_pcm_substream *substream, 2769 unsigned int cmd, void __user *arg) 2770 { 2771 switch (cmd) { 2772 case SNDRV_PCM_IOCTL_PVERSION: 2773 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2774 case SNDRV_PCM_IOCTL_INFO: 2775 return snd_pcm_info_user(substream, arg); 2776 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2777 return 0; 2778 case SNDRV_PCM_IOCTL_TTSTAMP: 2779 return snd_pcm_tstamp(substream, arg); 2780 case SNDRV_PCM_IOCTL_HW_REFINE: 2781 return snd_pcm_hw_refine_user(substream, arg); 2782 case SNDRV_PCM_IOCTL_HW_PARAMS: 2783 return snd_pcm_hw_params_user(substream, arg); 2784 case SNDRV_PCM_IOCTL_HW_FREE: 2785 return snd_pcm_hw_free(substream); 2786 case SNDRV_PCM_IOCTL_SW_PARAMS: 2787 return snd_pcm_sw_params_user(substream, arg); 2788 case SNDRV_PCM_IOCTL_STATUS: 2789 return snd_pcm_status_user(substream, arg, false); 2790 case SNDRV_PCM_IOCTL_STATUS_EXT: 2791 return snd_pcm_status_user(substream, arg, true); 2792 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2793 return snd_pcm_channel_info_user(substream, arg); 2794 case SNDRV_PCM_IOCTL_PREPARE: 2795 return snd_pcm_prepare(substream, file); 2796 case SNDRV_PCM_IOCTL_RESET: 2797 return snd_pcm_reset(substream); 2798 case SNDRV_PCM_IOCTL_START: 2799 return snd_pcm_start_lock_irq(substream); 2800 case SNDRV_PCM_IOCTL_LINK: 2801 return snd_pcm_link(substream, (int)(unsigned long) arg); 2802 case SNDRV_PCM_IOCTL_UNLINK: 2803 return snd_pcm_unlink(substream); 2804 case SNDRV_PCM_IOCTL_RESUME: 2805 return snd_pcm_resume(substream); 2806 case SNDRV_PCM_IOCTL_XRUN: 2807 return snd_pcm_xrun(substream); 2808 case SNDRV_PCM_IOCTL_HWSYNC: 2809 return snd_pcm_hwsync(substream); 2810 case SNDRV_PCM_IOCTL_DELAY: 2811 { 2812 snd_pcm_sframes_t delay = snd_pcm_delay(substream); 2813 snd_pcm_sframes_t __user *res = arg; 2814 2815 if (delay < 0) 2816 return delay; 2817 if (put_user(delay, res)) 2818 return -EFAULT; 2819 return 0; 2820 } 2821 case SNDRV_PCM_IOCTL_SYNC_PTR: 2822 return snd_pcm_sync_ptr(substream, arg); 2823 #ifdef CONFIG_SND_SUPPORT_OLD_API 2824 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2825 return snd_pcm_hw_refine_old_user(substream, arg); 2826 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2827 return snd_pcm_hw_params_old_user(substream, arg); 2828 #endif 2829 case SNDRV_PCM_IOCTL_DRAIN: 2830 return snd_pcm_drain(substream, file); 2831 case SNDRV_PCM_IOCTL_DROP: 2832 return snd_pcm_drop(substream); 2833 case SNDRV_PCM_IOCTL_PAUSE: 2834 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2835 substream, 2836 (int)(unsigned long)arg); 2837 } 2838 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2839 return -ENOTTY; 2840 } 2841 2842 static int snd_pcm_common_ioctl1(struct file *file, 2843 struct snd_pcm_substream *substream, 2844 unsigned int cmd, void __user *arg) 2845 { 2846 struct snd_card *card = substream->pcm->card; 2847 int res; 2848 2849 snd_power_lock(card); 2850 res = snd_power_wait(card, SNDRV_CTL_POWER_D0); 2851 if (res >= 0) 2852 res = snd_pcm_common_ioctl(file, substream, cmd, arg); 2853 snd_power_unlock(card); 2854 return res; 2855 } 2856 2857 static int snd_pcm_playback_ioctl1(struct file *file, 2858 struct snd_pcm_substream *substream, 2859 unsigned int cmd, void __user *arg) 2860 { 2861 if (snd_BUG_ON(!substream)) 2862 return -ENXIO; 2863 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2864 return -EINVAL; 2865 switch (cmd) { 2866 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2867 { 2868 struct snd_xferi xferi; 2869 struct snd_xferi __user *_xferi = arg; 2870 struct snd_pcm_runtime *runtime = substream->runtime; 2871 snd_pcm_sframes_t result; 2872 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2873 return -EBADFD; 2874 if (put_user(0, &_xferi->result)) 2875 return -EFAULT; 2876 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2877 return -EFAULT; 2878 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2879 __put_user(result, &_xferi->result); 2880 return result < 0 ? result : 0; 2881 } 2882 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2883 { 2884 struct snd_xfern xfern; 2885 struct snd_xfern __user *_xfern = arg; 2886 struct snd_pcm_runtime *runtime = substream->runtime; 2887 void __user **bufs; 2888 snd_pcm_sframes_t result; 2889 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2890 return -EBADFD; 2891 if (runtime->channels > 128) 2892 return -EINVAL; 2893 if (put_user(0, &_xfern->result)) 2894 return -EFAULT; 2895 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2896 return -EFAULT; 2897 2898 bufs = memdup_user(xfern.bufs, 2899 sizeof(void *) * runtime->channels); 2900 if (IS_ERR(bufs)) 2901 return PTR_ERR(bufs); 2902 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2903 kfree(bufs); 2904 __put_user(result, &_xfern->result); 2905 return result < 0 ? result : 0; 2906 } 2907 case SNDRV_PCM_IOCTL_REWIND: 2908 { 2909 snd_pcm_uframes_t frames; 2910 snd_pcm_uframes_t __user *_frames = arg; 2911 snd_pcm_sframes_t result; 2912 if (get_user(frames, _frames)) 2913 return -EFAULT; 2914 if (put_user(0, _frames)) 2915 return -EFAULT; 2916 result = snd_pcm_playback_rewind(substream, frames); 2917 __put_user(result, _frames); 2918 return result < 0 ? result : 0; 2919 } 2920 case SNDRV_PCM_IOCTL_FORWARD: 2921 { 2922 snd_pcm_uframes_t frames; 2923 snd_pcm_uframes_t __user *_frames = arg; 2924 snd_pcm_sframes_t result; 2925 if (get_user(frames, _frames)) 2926 return -EFAULT; 2927 if (put_user(0, _frames)) 2928 return -EFAULT; 2929 result = snd_pcm_playback_forward(substream, frames); 2930 __put_user(result, _frames); 2931 return result < 0 ? result : 0; 2932 } 2933 } 2934 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2935 } 2936 2937 static int snd_pcm_capture_ioctl1(struct file *file, 2938 struct snd_pcm_substream *substream, 2939 unsigned int cmd, void __user *arg) 2940 { 2941 if (snd_BUG_ON(!substream)) 2942 return -ENXIO; 2943 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2944 return -EINVAL; 2945 switch (cmd) { 2946 case SNDRV_PCM_IOCTL_READI_FRAMES: 2947 { 2948 struct snd_xferi xferi; 2949 struct snd_xferi __user *_xferi = arg; 2950 struct snd_pcm_runtime *runtime = substream->runtime; 2951 snd_pcm_sframes_t result; 2952 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2953 return -EBADFD; 2954 if (put_user(0, &_xferi->result)) 2955 return -EFAULT; 2956 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2957 return -EFAULT; 2958 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2959 __put_user(result, &_xferi->result); 2960 return result < 0 ? result : 0; 2961 } 2962 case SNDRV_PCM_IOCTL_READN_FRAMES: 2963 { 2964 struct snd_xfern xfern; 2965 struct snd_xfern __user *_xfern = arg; 2966 struct snd_pcm_runtime *runtime = substream->runtime; 2967 void *bufs; 2968 snd_pcm_sframes_t result; 2969 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2970 return -EBADFD; 2971 if (runtime->channels > 128) 2972 return -EINVAL; 2973 if (put_user(0, &_xfern->result)) 2974 return -EFAULT; 2975 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2976 return -EFAULT; 2977 2978 bufs = memdup_user(xfern.bufs, 2979 sizeof(void *) * runtime->channels); 2980 if (IS_ERR(bufs)) 2981 return PTR_ERR(bufs); 2982 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2983 kfree(bufs); 2984 __put_user(result, &_xfern->result); 2985 return result < 0 ? result : 0; 2986 } 2987 case SNDRV_PCM_IOCTL_REWIND: 2988 { 2989 snd_pcm_uframes_t frames; 2990 snd_pcm_uframes_t __user *_frames = arg; 2991 snd_pcm_sframes_t result; 2992 if (get_user(frames, _frames)) 2993 return -EFAULT; 2994 if (put_user(0, _frames)) 2995 return -EFAULT; 2996 result = snd_pcm_capture_rewind(substream, frames); 2997 __put_user(result, _frames); 2998 return result < 0 ? result : 0; 2999 } 3000 case SNDRV_PCM_IOCTL_FORWARD: 3001 { 3002 snd_pcm_uframes_t frames; 3003 snd_pcm_uframes_t __user *_frames = arg; 3004 snd_pcm_sframes_t result; 3005 if (get_user(frames, _frames)) 3006 return -EFAULT; 3007 if (put_user(0, _frames)) 3008 return -EFAULT; 3009 result = snd_pcm_capture_forward(substream, frames); 3010 __put_user(result, _frames); 3011 return result < 0 ? result : 0; 3012 } 3013 } 3014 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 3015 } 3016 3017 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 3018 unsigned long arg) 3019 { 3020 struct snd_pcm_file *pcm_file; 3021 3022 pcm_file = file->private_data; 3023 3024 if (((cmd >> 8) & 0xff) != 'A') 3025 return -ENOTTY; 3026 3027 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 3028 (void __user *)arg); 3029 } 3030 3031 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 3032 unsigned long arg) 3033 { 3034 struct snd_pcm_file *pcm_file; 3035 3036 pcm_file = file->private_data; 3037 3038 if (((cmd >> 8) & 0xff) != 'A') 3039 return -ENOTTY; 3040 3041 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 3042 (void __user *)arg); 3043 } 3044 3045 /** 3046 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3047 * @substream: PCM substream 3048 * @cmd: IOCTL cmd 3049 * @arg: IOCTL argument 3050 * 3051 * The function is provided primarily for OSS layer and USB gadget drivers, 3052 * and it allows only the limited set of ioctls (hw_params, sw_params, 3053 * prepare, start, drain, drop, forward). 3054 */ 3055 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3056 unsigned int cmd, void *arg) 3057 { 3058 snd_pcm_uframes_t *frames = arg; 3059 snd_pcm_sframes_t result; 3060 3061 switch (cmd) { 3062 case SNDRV_PCM_IOCTL_FORWARD: 3063 { 3064 /* provided only for OSS; capture-only and no value returned */ 3065 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3066 return -EINVAL; 3067 result = snd_pcm_capture_forward(substream, *frames); 3068 return result < 0 ? result : 0; 3069 } 3070 case SNDRV_PCM_IOCTL_HW_PARAMS: 3071 return snd_pcm_hw_params(substream, arg); 3072 case SNDRV_PCM_IOCTL_SW_PARAMS: 3073 return snd_pcm_sw_params(substream, arg); 3074 case SNDRV_PCM_IOCTL_PREPARE: 3075 return snd_pcm_prepare(substream, NULL); 3076 case SNDRV_PCM_IOCTL_START: 3077 return snd_pcm_start_lock_irq(substream); 3078 case SNDRV_PCM_IOCTL_DRAIN: 3079 return snd_pcm_drain(substream, NULL); 3080 case SNDRV_PCM_IOCTL_DROP: 3081 return snd_pcm_drop(substream); 3082 case SNDRV_PCM_IOCTL_DELAY: 3083 { 3084 result = snd_pcm_delay(substream); 3085 if (result < 0) 3086 return result; 3087 *frames = result; 3088 return 0; 3089 } 3090 default: 3091 return -EINVAL; 3092 } 3093 } 3094 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3095 3096 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3097 loff_t * offset) 3098 { 3099 struct snd_pcm_file *pcm_file; 3100 struct snd_pcm_substream *substream; 3101 struct snd_pcm_runtime *runtime; 3102 snd_pcm_sframes_t result; 3103 3104 pcm_file = file->private_data; 3105 substream = pcm_file->substream; 3106 if (PCM_RUNTIME_CHECK(substream)) 3107 return -ENXIO; 3108 runtime = substream->runtime; 3109 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3110 return -EBADFD; 3111 if (!frame_aligned(runtime, count)) 3112 return -EINVAL; 3113 count = bytes_to_frames(runtime, count); 3114 result = snd_pcm_lib_read(substream, buf, count); 3115 if (result > 0) 3116 result = frames_to_bytes(runtime, result); 3117 return result; 3118 } 3119 3120 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3121 size_t count, loff_t * offset) 3122 { 3123 struct snd_pcm_file *pcm_file; 3124 struct snd_pcm_substream *substream; 3125 struct snd_pcm_runtime *runtime; 3126 snd_pcm_sframes_t result; 3127 3128 pcm_file = file->private_data; 3129 substream = pcm_file->substream; 3130 if (PCM_RUNTIME_CHECK(substream)) 3131 return -ENXIO; 3132 runtime = substream->runtime; 3133 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3134 return -EBADFD; 3135 if (!frame_aligned(runtime, count)) 3136 return -EINVAL; 3137 count = bytes_to_frames(runtime, count); 3138 result = snd_pcm_lib_write(substream, buf, count); 3139 if (result > 0) 3140 result = frames_to_bytes(runtime, result); 3141 return result; 3142 } 3143 3144 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 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 unsigned long i; 3151 void __user **bufs; 3152 snd_pcm_uframes_t frames; 3153 3154 pcm_file = iocb->ki_filp->private_data; 3155 substream = pcm_file->substream; 3156 if (PCM_RUNTIME_CHECK(substream)) 3157 return -ENXIO; 3158 runtime = substream->runtime; 3159 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3160 return -EBADFD; 3161 if (!iter_is_iovec(to)) 3162 return -EINVAL; 3163 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3164 return -EINVAL; 3165 if (!frame_aligned(runtime, to->iov->iov_len)) 3166 return -EINVAL; 3167 frames = bytes_to_samples(runtime, to->iov->iov_len); 3168 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3169 if (bufs == NULL) 3170 return -ENOMEM; 3171 for (i = 0; i < to->nr_segs; ++i) 3172 bufs[i] = to->iov[i].iov_base; 3173 result = snd_pcm_lib_readv(substream, bufs, frames); 3174 if (result > 0) 3175 result = frames_to_bytes(runtime, result); 3176 kfree(bufs); 3177 return result; 3178 } 3179 3180 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3181 { 3182 struct snd_pcm_file *pcm_file; 3183 struct snd_pcm_substream *substream; 3184 struct snd_pcm_runtime *runtime; 3185 snd_pcm_sframes_t result; 3186 unsigned long i; 3187 void __user **bufs; 3188 snd_pcm_uframes_t frames; 3189 3190 pcm_file = iocb->ki_filp->private_data; 3191 substream = pcm_file->substream; 3192 if (PCM_RUNTIME_CHECK(substream)) 3193 return -ENXIO; 3194 runtime = substream->runtime; 3195 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3196 return -EBADFD; 3197 if (!iter_is_iovec(from)) 3198 return -EINVAL; 3199 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3200 !frame_aligned(runtime, from->iov->iov_len)) 3201 return -EINVAL; 3202 frames = bytes_to_samples(runtime, from->iov->iov_len); 3203 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3204 if (bufs == NULL) 3205 return -ENOMEM; 3206 for (i = 0; i < from->nr_segs; ++i) 3207 bufs[i] = from->iov[i].iov_base; 3208 result = snd_pcm_lib_writev(substream, bufs, frames); 3209 if (result > 0) 3210 result = frames_to_bytes(runtime, result); 3211 kfree(bufs); 3212 return result; 3213 } 3214 3215 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3216 { 3217 struct snd_pcm_file *pcm_file; 3218 struct snd_pcm_substream *substream; 3219 struct snd_pcm_runtime *runtime; 3220 unsigned int mask; 3221 snd_pcm_uframes_t avail; 3222 3223 pcm_file = file->private_data; 3224 3225 substream = pcm_file->substream; 3226 if (PCM_RUNTIME_CHECK(substream)) 3227 return POLLOUT | POLLWRNORM | POLLERR; 3228 runtime = substream->runtime; 3229 3230 poll_wait(file, &runtime->sleep, wait); 3231 3232 snd_pcm_stream_lock_irq(substream); 3233 avail = snd_pcm_playback_avail(runtime); 3234 switch (runtime->status->state) { 3235 case SNDRV_PCM_STATE_RUNNING: 3236 case SNDRV_PCM_STATE_PREPARED: 3237 case SNDRV_PCM_STATE_PAUSED: 3238 if (avail >= runtime->control->avail_min) { 3239 mask = POLLOUT | POLLWRNORM; 3240 break; 3241 } 3242 /* Fall through */ 3243 case SNDRV_PCM_STATE_DRAINING: 3244 mask = 0; 3245 break; 3246 default: 3247 mask = POLLOUT | POLLWRNORM | POLLERR; 3248 break; 3249 } 3250 snd_pcm_stream_unlock_irq(substream); 3251 return mask; 3252 } 3253 3254 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3255 { 3256 struct snd_pcm_file *pcm_file; 3257 struct snd_pcm_substream *substream; 3258 struct snd_pcm_runtime *runtime; 3259 unsigned int mask; 3260 snd_pcm_uframes_t avail; 3261 3262 pcm_file = file->private_data; 3263 3264 substream = pcm_file->substream; 3265 if (PCM_RUNTIME_CHECK(substream)) 3266 return POLLIN | POLLRDNORM | POLLERR; 3267 runtime = substream->runtime; 3268 3269 poll_wait(file, &runtime->sleep, wait); 3270 3271 snd_pcm_stream_lock_irq(substream); 3272 avail = snd_pcm_capture_avail(runtime); 3273 switch (runtime->status->state) { 3274 case SNDRV_PCM_STATE_RUNNING: 3275 case SNDRV_PCM_STATE_PREPARED: 3276 case SNDRV_PCM_STATE_PAUSED: 3277 if (avail >= runtime->control->avail_min) { 3278 mask = POLLIN | POLLRDNORM; 3279 break; 3280 } 3281 mask = 0; 3282 break; 3283 case SNDRV_PCM_STATE_DRAINING: 3284 if (avail > 0) { 3285 mask = POLLIN | POLLRDNORM; 3286 break; 3287 } 3288 /* Fall through */ 3289 default: 3290 mask = POLLIN | POLLRDNORM | POLLERR; 3291 break; 3292 } 3293 snd_pcm_stream_unlock_irq(substream); 3294 return mask; 3295 } 3296 3297 /* 3298 * mmap support 3299 */ 3300 3301 /* 3302 * Only on coherent architectures, we can mmap the status and the control records 3303 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3304 */ 3305 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3306 /* 3307 * mmap status record 3308 */ 3309 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3310 { 3311 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3312 struct snd_pcm_runtime *runtime; 3313 3314 if (substream == NULL) 3315 return VM_FAULT_SIGBUS; 3316 runtime = substream->runtime; 3317 vmf->page = virt_to_page(runtime->status); 3318 get_page(vmf->page); 3319 return 0; 3320 } 3321 3322 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3323 { 3324 .fault = snd_pcm_mmap_status_fault, 3325 }; 3326 3327 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3328 struct vm_area_struct *area) 3329 { 3330 long size; 3331 if (!(area->vm_flags & VM_READ)) 3332 return -EINVAL; 3333 size = area->vm_end - area->vm_start; 3334 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3335 return -EINVAL; 3336 area->vm_ops = &snd_pcm_vm_ops_status; 3337 area->vm_private_data = substream; 3338 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3339 return 0; 3340 } 3341 3342 /* 3343 * mmap control record 3344 */ 3345 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3346 { 3347 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3348 struct snd_pcm_runtime *runtime; 3349 3350 if (substream == NULL) 3351 return VM_FAULT_SIGBUS; 3352 runtime = substream->runtime; 3353 vmf->page = virt_to_page(runtime->control); 3354 get_page(vmf->page); 3355 return 0; 3356 } 3357 3358 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3359 { 3360 .fault = snd_pcm_mmap_control_fault, 3361 }; 3362 3363 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3364 struct vm_area_struct *area) 3365 { 3366 long size; 3367 if (!(area->vm_flags & VM_READ)) 3368 return -EINVAL; 3369 size = area->vm_end - area->vm_start; 3370 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3371 return -EINVAL; 3372 area->vm_ops = &snd_pcm_vm_ops_control; 3373 area->vm_private_data = substream; 3374 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3375 return 0; 3376 } 3377 #else /* ! coherent mmap */ 3378 /* 3379 * don't support mmap for status and control records. 3380 */ 3381 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3382 struct vm_area_struct *area) 3383 { 3384 return -ENXIO; 3385 } 3386 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3387 struct vm_area_struct *area) 3388 { 3389 return -ENXIO; 3390 } 3391 #endif /* coherent mmap */ 3392 3393 static inline struct page * 3394 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3395 { 3396 void *vaddr = substream->runtime->dma_area + ofs; 3397 return virt_to_page(vaddr); 3398 } 3399 3400 /* 3401 * fault callback for mmapping a RAM page 3402 */ 3403 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3404 { 3405 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3406 struct snd_pcm_runtime *runtime; 3407 unsigned long offset; 3408 struct page * page; 3409 size_t dma_bytes; 3410 3411 if (substream == NULL) 3412 return VM_FAULT_SIGBUS; 3413 runtime = substream->runtime; 3414 offset = vmf->pgoff << PAGE_SHIFT; 3415 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3416 if (offset > dma_bytes - PAGE_SIZE) 3417 return VM_FAULT_SIGBUS; 3418 if (substream->ops->page) 3419 page = substream->ops->page(substream, offset); 3420 else 3421 page = snd_pcm_default_page_ops(substream, offset); 3422 if (!page) 3423 return VM_FAULT_SIGBUS; 3424 get_page(page); 3425 vmf->page = page; 3426 return 0; 3427 } 3428 3429 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3430 .open = snd_pcm_mmap_data_open, 3431 .close = snd_pcm_mmap_data_close, 3432 }; 3433 3434 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3435 .open = snd_pcm_mmap_data_open, 3436 .close = snd_pcm_mmap_data_close, 3437 .fault = snd_pcm_mmap_data_fault, 3438 }; 3439 3440 /* 3441 * mmap the DMA buffer on RAM 3442 */ 3443 3444 /** 3445 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3446 * @substream: PCM substream 3447 * @area: VMA 3448 * 3449 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3450 * this function is invoked implicitly. 3451 */ 3452 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3453 struct vm_area_struct *area) 3454 { 3455 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3456 #ifdef CONFIG_GENERIC_ALLOCATOR 3457 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3458 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3459 return remap_pfn_range(area, area->vm_start, 3460 substream->dma_buffer.addr >> PAGE_SHIFT, 3461 area->vm_end - area->vm_start, area->vm_page_prot); 3462 } 3463 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3464 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3465 if (!substream->ops->page && 3466 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3467 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3468 area, 3469 substream->runtime->dma_area, 3470 substream->runtime->dma_addr, 3471 area->vm_end - area->vm_start); 3472 #endif /* CONFIG_X86 */ 3473 /* mmap with fault handler */ 3474 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3475 return 0; 3476 } 3477 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3478 3479 /* 3480 * mmap the DMA buffer on I/O memory area 3481 */ 3482 #if SNDRV_PCM_INFO_MMAP_IOMEM 3483 /** 3484 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3485 * @substream: PCM substream 3486 * @area: VMA 3487 * 3488 * When your hardware uses the iomapped pages as the hardware buffer and 3489 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3490 * is supposed to work only on limited architectures. 3491 */ 3492 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3493 struct vm_area_struct *area) 3494 { 3495 struct snd_pcm_runtime *runtime = substream->runtime;; 3496 3497 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3498 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3499 } 3500 3501 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3502 #endif /* SNDRV_PCM_INFO_MMAP */ 3503 3504 /* 3505 * mmap DMA buffer 3506 */ 3507 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3508 struct vm_area_struct *area) 3509 { 3510 struct snd_pcm_runtime *runtime; 3511 long size; 3512 unsigned long offset; 3513 size_t dma_bytes; 3514 int err; 3515 3516 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3517 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3518 return -EINVAL; 3519 } else { 3520 if (!(area->vm_flags & VM_READ)) 3521 return -EINVAL; 3522 } 3523 runtime = substream->runtime; 3524 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3525 return -EBADFD; 3526 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3527 return -ENXIO; 3528 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3529 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3530 return -EINVAL; 3531 size = area->vm_end - area->vm_start; 3532 offset = area->vm_pgoff << PAGE_SHIFT; 3533 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3534 if ((size_t)size > dma_bytes) 3535 return -EINVAL; 3536 if (offset > dma_bytes - size) 3537 return -EINVAL; 3538 3539 area->vm_ops = &snd_pcm_vm_ops_data; 3540 area->vm_private_data = substream; 3541 if (substream->ops->mmap) 3542 err = substream->ops->mmap(substream, area); 3543 else 3544 err = snd_pcm_lib_default_mmap(substream, area); 3545 if (!err) 3546 atomic_inc(&substream->mmap_count); 3547 return err; 3548 } 3549 3550 EXPORT_SYMBOL(snd_pcm_mmap_data); 3551 3552 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3553 { 3554 struct snd_pcm_file * pcm_file; 3555 struct snd_pcm_substream *substream; 3556 unsigned long offset; 3557 3558 pcm_file = file->private_data; 3559 substream = pcm_file->substream; 3560 if (PCM_RUNTIME_CHECK(substream)) 3561 return -ENXIO; 3562 3563 offset = area->vm_pgoff << PAGE_SHIFT; 3564 switch (offset) { 3565 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3566 if (pcm_file->no_compat_mmap) 3567 return -ENXIO; 3568 return snd_pcm_mmap_status(substream, file, area); 3569 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3570 if (pcm_file->no_compat_mmap) 3571 return -ENXIO; 3572 return snd_pcm_mmap_control(substream, file, area); 3573 default: 3574 return snd_pcm_mmap_data(substream, file, area); 3575 } 3576 return 0; 3577 } 3578 3579 static int snd_pcm_fasync(int fd, struct file * file, int on) 3580 { 3581 struct snd_pcm_file * pcm_file; 3582 struct snd_pcm_substream *substream; 3583 struct snd_pcm_runtime *runtime; 3584 3585 pcm_file = file->private_data; 3586 substream = pcm_file->substream; 3587 if (PCM_RUNTIME_CHECK(substream)) 3588 return -ENXIO; 3589 runtime = substream->runtime; 3590 return fasync_helper(fd, file, on, &runtime->fasync); 3591 } 3592 3593 /* 3594 * ioctl32 compat 3595 */ 3596 #ifdef CONFIG_COMPAT 3597 #include "pcm_compat.c" 3598 #else 3599 #define snd_pcm_ioctl_compat NULL 3600 #endif 3601 3602 /* 3603 * To be removed helpers to keep binary compatibility 3604 */ 3605 3606 #ifdef CONFIG_SND_SUPPORT_OLD_API 3607 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3608 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3609 3610 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3611 struct snd_pcm_hw_params_old *oparams) 3612 { 3613 unsigned int i; 3614 3615 memset(params, 0, sizeof(*params)); 3616 params->flags = oparams->flags; 3617 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3618 params->masks[i].bits[0] = oparams->masks[i]; 3619 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3620 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3621 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3622 params->info = oparams->info; 3623 params->msbits = oparams->msbits; 3624 params->rate_num = oparams->rate_num; 3625 params->rate_den = oparams->rate_den; 3626 params->fifo_size = oparams->fifo_size; 3627 } 3628 3629 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3630 struct snd_pcm_hw_params *params) 3631 { 3632 unsigned int i; 3633 3634 memset(oparams, 0, sizeof(*oparams)); 3635 oparams->flags = params->flags; 3636 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3637 oparams->masks[i] = params->masks[i].bits[0]; 3638 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3639 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3640 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3641 oparams->info = params->info; 3642 oparams->msbits = params->msbits; 3643 oparams->rate_num = params->rate_num; 3644 oparams->rate_den = params->rate_den; 3645 oparams->fifo_size = params->fifo_size; 3646 } 3647 3648 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3649 struct snd_pcm_hw_params_old __user * _oparams) 3650 { 3651 struct snd_pcm_hw_params *params; 3652 struct snd_pcm_hw_params_old *oparams = NULL; 3653 int err; 3654 3655 params = kmalloc(sizeof(*params), GFP_KERNEL); 3656 if (!params) 3657 return -ENOMEM; 3658 3659 oparams = memdup_user(_oparams, sizeof(*oparams)); 3660 if (IS_ERR(oparams)) { 3661 err = PTR_ERR(oparams); 3662 goto out; 3663 } 3664 snd_pcm_hw_convert_from_old_params(params, oparams); 3665 err = snd_pcm_hw_refine(substream, params); 3666 if (err < 0) 3667 goto out_old; 3668 3669 err = fixup_unreferenced_params(substream, params); 3670 if (err < 0) 3671 goto out_old; 3672 3673 snd_pcm_hw_convert_to_old_params(oparams, params); 3674 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3675 err = -EFAULT; 3676 out_old: 3677 kfree(oparams); 3678 out: 3679 kfree(params); 3680 return err; 3681 } 3682 3683 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3684 struct snd_pcm_hw_params_old __user * _oparams) 3685 { 3686 struct snd_pcm_hw_params *params; 3687 struct snd_pcm_hw_params_old *oparams = NULL; 3688 int err; 3689 3690 params = kmalloc(sizeof(*params), GFP_KERNEL); 3691 if (!params) 3692 return -ENOMEM; 3693 3694 oparams = memdup_user(_oparams, sizeof(*oparams)); 3695 if (IS_ERR(oparams)) { 3696 err = PTR_ERR(oparams); 3697 goto out; 3698 } 3699 3700 snd_pcm_hw_convert_from_old_params(params, oparams); 3701 err = snd_pcm_hw_params(substream, params); 3702 if (err < 0) 3703 goto out_old; 3704 3705 snd_pcm_hw_convert_to_old_params(oparams, params); 3706 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3707 err = -EFAULT; 3708 out_old: 3709 kfree(oparams); 3710 out: 3711 kfree(params); 3712 return err; 3713 } 3714 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3715 3716 #ifndef CONFIG_MMU 3717 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3718 unsigned long addr, 3719 unsigned long len, 3720 unsigned long pgoff, 3721 unsigned long flags) 3722 { 3723 struct snd_pcm_file *pcm_file = file->private_data; 3724 struct snd_pcm_substream *substream = pcm_file->substream; 3725 struct snd_pcm_runtime *runtime = substream->runtime; 3726 unsigned long offset = pgoff << PAGE_SHIFT; 3727 3728 switch (offset) { 3729 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3730 return (unsigned long)runtime->status; 3731 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3732 return (unsigned long)runtime->control; 3733 default: 3734 return (unsigned long)runtime->dma_area + offset; 3735 } 3736 } 3737 #else 3738 # define snd_pcm_get_unmapped_area NULL 3739 #endif 3740 3741 /* 3742 * Register section 3743 */ 3744 3745 const struct file_operations snd_pcm_f_ops[2] = { 3746 { 3747 .owner = THIS_MODULE, 3748 .write = snd_pcm_write, 3749 .write_iter = snd_pcm_writev, 3750 .open = snd_pcm_playback_open, 3751 .release = snd_pcm_release, 3752 .llseek = no_llseek, 3753 .poll = snd_pcm_playback_poll, 3754 .unlocked_ioctl = snd_pcm_playback_ioctl, 3755 .compat_ioctl = snd_pcm_ioctl_compat, 3756 .mmap = snd_pcm_mmap, 3757 .fasync = snd_pcm_fasync, 3758 .get_unmapped_area = snd_pcm_get_unmapped_area, 3759 }, 3760 { 3761 .owner = THIS_MODULE, 3762 .read = snd_pcm_read, 3763 .read_iter = snd_pcm_readv, 3764 .open = snd_pcm_capture_open, 3765 .release = snd_pcm_release, 3766 .llseek = no_llseek, 3767 .poll = snd_pcm_capture_poll, 3768 .unlocked_ioctl = snd_pcm_capture_ioctl, 3769 .compat_ioctl = snd_pcm_ioctl_compat, 3770 .mmap = snd_pcm_mmap, 3771 .fasync = snd_pcm_fasync, 3772 .get_unmapped_area = snd_pcm_get_unmapped_area, 3773 } 3774 }; 3775