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 snd_pcm_stream_lock_irq(substream); 1688 switch (substream->runtime->status->state) { 1689 case SNDRV_PCM_STATE_PAUSED: 1690 snd_pcm_pause(substream, 0); 1691 /* fallthru */ 1692 case SNDRV_PCM_STATE_SUSPENDED: 1693 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1694 break; 1695 } 1696 snd_pcm_stream_unlock_irq(substream); 1697 1698 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1699 substream, f_flags); 1700 } 1701 1702 /* 1703 * drain ioctl 1704 */ 1705 1706 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1707 { 1708 struct snd_pcm_runtime *runtime = substream->runtime; 1709 switch (runtime->status->state) { 1710 case SNDRV_PCM_STATE_OPEN: 1711 case SNDRV_PCM_STATE_DISCONNECTED: 1712 case SNDRV_PCM_STATE_SUSPENDED: 1713 return -EBADFD; 1714 } 1715 runtime->trigger_master = substream; 1716 return 0; 1717 } 1718 1719 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1720 { 1721 struct snd_pcm_runtime *runtime = substream->runtime; 1722 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1723 switch (runtime->status->state) { 1724 case SNDRV_PCM_STATE_PREPARED: 1725 /* start playback stream if possible */ 1726 if (! snd_pcm_playback_empty(substream)) { 1727 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1728 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1729 } else { 1730 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1731 } 1732 break; 1733 case SNDRV_PCM_STATE_RUNNING: 1734 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1735 break; 1736 case SNDRV_PCM_STATE_XRUN: 1737 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1738 break; 1739 default: 1740 break; 1741 } 1742 } else { 1743 /* stop running stream */ 1744 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1745 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1746 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1747 snd_pcm_do_stop(substream, new_state); 1748 snd_pcm_post_stop(substream, new_state); 1749 } 1750 } 1751 1752 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1753 runtime->trigger_master == substream && 1754 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1755 return substream->ops->trigger(substream, 1756 SNDRV_PCM_TRIGGER_DRAIN); 1757 1758 return 0; 1759 } 1760 1761 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1762 { 1763 } 1764 1765 static const struct action_ops snd_pcm_action_drain_init = { 1766 .pre_action = snd_pcm_pre_drain_init, 1767 .do_action = snd_pcm_do_drain_init, 1768 .post_action = snd_pcm_post_drain_init 1769 }; 1770 1771 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1772 1773 /* 1774 * Drain the stream(s). 1775 * When the substream is linked, sync until the draining of all playback streams 1776 * is finished. 1777 * After this call, all streams are supposed to be either SETUP or DRAINING 1778 * (capture only) state. 1779 */ 1780 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1781 struct file *file) 1782 { 1783 struct snd_card *card; 1784 struct snd_pcm_runtime *runtime; 1785 struct snd_pcm_substream *s; 1786 wait_queue_t wait; 1787 int result = 0; 1788 int nonblock = 0; 1789 1790 card = substream->pcm->card; 1791 runtime = substream->runtime; 1792 1793 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1794 return -EBADFD; 1795 1796 if (file) { 1797 if (file->f_flags & O_NONBLOCK) 1798 nonblock = 1; 1799 } else if (substream->f_flags & O_NONBLOCK) 1800 nonblock = 1; 1801 1802 down_read(&snd_pcm_link_rwsem); 1803 snd_pcm_stream_lock_irq(substream); 1804 /* resume pause */ 1805 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1806 snd_pcm_pause(substream, 0); 1807 1808 /* pre-start/stop - all running streams are changed to DRAINING state */ 1809 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1810 if (result < 0) 1811 goto unlock; 1812 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1813 if (nonblock) { 1814 result = -EAGAIN; 1815 goto unlock; 1816 } 1817 1818 for (;;) { 1819 long tout; 1820 struct snd_pcm_runtime *to_check; 1821 if (signal_pending(current)) { 1822 result = -ERESTARTSYS; 1823 break; 1824 } 1825 /* find a substream to drain */ 1826 to_check = NULL; 1827 snd_pcm_group_for_each_entry(s, substream) { 1828 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1829 continue; 1830 runtime = s->runtime; 1831 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1832 to_check = runtime; 1833 break; 1834 } 1835 } 1836 if (!to_check) 1837 break; /* all drained */ 1838 init_waitqueue_entry(&wait, current); 1839 add_wait_queue(&to_check->sleep, &wait); 1840 snd_pcm_stream_unlock_irq(substream); 1841 up_read(&snd_pcm_link_rwsem); 1842 snd_power_unlock(card); 1843 if (runtime->no_period_wakeup) 1844 tout = MAX_SCHEDULE_TIMEOUT; 1845 else { 1846 tout = 10; 1847 if (runtime->rate) { 1848 long t = runtime->period_size * 2 / runtime->rate; 1849 tout = max(t, tout); 1850 } 1851 tout = msecs_to_jiffies(tout * 1000); 1852 } 1853 tout = schedule_timeout_interruptible(tout); 1854 snd_power_lock(card); 1855 down_read(&snd_pcm_link_rwsem); 1856 snd_pcm_stream_lock_irq(substream); 1857 remove_wait_queue(&to_check->sleep, &wait); 1858 if (card->shutdown) { 1859 result = -ENODEV; 1860 break; 1861 } 1862 if (tout == 0) { 1863 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1864 result = -ESTRPIPE; 1865 else { 1866 dev_dbg(substream->pcm->card->dev, 1867 "playback drain error (DMA or IRQ trouble?)\n"); 1868 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1869 result = -EIO; 1870 } 1871 break; 1872 } 1873 } 1874 1875 unlock: 1876 snd_pcm_stream_unlock_irq(substream); 1877 up_read(&snd_pcm_link_rwsem); 1878 1879 return result; 1880 } 1881 1882 /* 1883 * drop ioctl 1884 * 1885 * Immediately put all linked substreams into SETUP state. 1886 */ 1887 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1888 { 1889 struct snd_pcm_runtime *runtime; 1890 int result = 0; 1891 1892 if (PCM_RUNTIME_CHECK(substream)) 1893 return -ENXIO; 1894 runtime = substream->runtime; 1895 1896 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1897 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1898 return -EBADFD; 1899 1900 snd_pcm_stream_lock_irq(substream); 1901 /* resume pause */ 1902 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1903 snd_pcm_pause(substream, 0); 1904 1905 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1906 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1907 snd_pcm_stream_unlock_irq(substream); 1908 1909 return result; 1910 } 1911 1912 1913 static bool is_pcm_file(struct file *file) 1914 { 1915 struct inode *inode = file_inode(file); 1916 unsigned int minor; 1917 1918 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1919 return false; 1920 minor = iminor(inode); 1921 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1922 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1923 } 1924 1925 /* 1926 * PCM link handling 1927 */ 1928 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1929 { 1930 int res = 0; 1931 struct snd_pcm_file *pcm_file; 1932 struct snd_pcm_substream *substream1; 1933 struct snd_pcm_group *group; 1934 struct fd f = fdget(fd); 1935 1936 if (!f.file) 1937 return -EBADFD; 1938 if (!is_pcm_file(f.file)) { 1939 res = -EBADFD; 1940 goto _badf; 1941 } 1942 pcm_file = f.file->private_data; 1943 substream1 = pcm_file->substream; 1944 group = kmalloc(sizeof(*group), GFP_KERNEL); 1945 if (!group) { 1946 res = -ENOMEM; 1947 goto _nolock; 1948 } 1949 down_write_nonblock(&snd_pcm_link_rwsem); 1950 write_lock_irq(&snd_pcm_link_rwlock); 1951 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1952 substream->runtime->status->state != substream1->runtime->status->state || 1953 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1954 res = -EBADFD; 1955 goto _end; 1956 } 1957 if (snd_pcm_stream_linked(substream1)) { 1958 res = -EALREADY; 1959 goto _end; 1960 } 1961 if (!snd_pcm_stream_linked(substream)) { 1962 substream->group = group; 1963 group = NULL; 1964 spin_lock_init(&substream->group->lock); 1965 mutex_init(&substream->group->mutex); 1966 INIT_LIST_HEAD(&substream->group->substreams); 1967 list_add_tail(&substream->link_list, &substream->group->substreams); 1968 substream->group->count = 1; 1969 } 1970 list_add_tail(&substream1->link_list, &substream->group->substreams); 1971 substream->group->count++; 1972 substream1->group = substream->group; 1973 _end: 1974 write_unlock_irq(&snd_pcm_link_rwlock); 1975 up_write(&snd_pcm_link_rwsem); 1976 _nolock: 1977 snd_card_unref(substream1->pcm->card); 1978 kfree(group); 1979 _badf: 1980 fdput(f); 1981 return res; 1982 } 1983 1984 static void relink_to_local(struct snd_pcm_substream *substream) 1985 { 1986 substream->group = &substream->self_group; 1987 INIT_LIST_HEAD(&substream->self_group.substreams); 1988 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1989 } 1990 1991 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1992 { 1993 struct snd_pcm_substream *s; 1994 int res = 0; 1995 1996 down_write_nonblock(&snd_pcm_link_rwsem); 1997 write_lock_irq(&snd_pcm_link_rwlock); 1998 if (!snd_pcm_stream_linked(substream)) { 1999 res = -EALREADY; 2000 goto _end; 2001 } 2002 list_del(&substream->link_list); 2003 substream->group->count--; 2004 if (substream->group->count == 1) { /* detach the last stream, too */ 2005 snd_pcm_group_for_each_entry(s, substream) { 2006 relink_to_local(s); 2007 break; 2008 } 2009 kfree(substream->group); 2010 } 2011 relink_to_local(substream); 2012 _end: 2013 write_unlock_irq(&snd_pcm_link_rwlock); 2014 up_write(&snd_pcm_link_rwsem); 2015 return res; 2016 } 2017 2018 /* 2019 * hw configurator 2020 */ 2021 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2022 struct snd_pcm_hw_rule *rule) 2023 { 2024 struct snd_interval t; 2025 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2026 hw_param_interval_c(params, rule->deps[1]), &t); 2027 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2028 } 2029 2030 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2031 struct snd_pcm_hw_rule *rule) 2032 { 2033 struct snd_interval t; 2034 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2035 hw_param_interval_c(params, rule->deps[1]), &t); 2036 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2037 } 2038 2039 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2040 struct snd_pcm_hw_rule *rule) 2041 { 2042 struct snd_interval t; 2043 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2044 hw_param_interval_c(params, rule->deps[1]), 2045 (unsigned long) rule->private, &t); 2046 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2047 } 2048 2049 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2050 struct snd_pcm_hw_rule *rule) 2051 { 2052 struct snd_interval t; 2053 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2054 (unsigned long) rule->private, 2055 hw_param_interval_c(params, rule->deps[1]), &t); 2056 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2057 } 2058 2059 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2060 struct snd_pcm_hw_rule *rule) 2061 { 2062 unsigned int k; 2063 const struct snd_interval *i = 2064 hw_param_interval_c(params, rule->deps[0]); 2065 struct snd_mask m; 2066 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2067 snd_mask_any(&m); 2068 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2069 int bits; 2070 if (! snd_mask_test(mask, k)) 2071 continue; 2072 bits = snd_pcm_format_physical_width(k); 2073 if (bits <= 0) 2074 continue; /* ignore invalid formats */ 2075 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2076 snd_mask_reset(&m, k); 2077 } 2078 return snd_mask_refine(mask, &m); 2079 } 2080 2081 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2082 struct snd_pcm_hw_rule *rule) 2083 { 2084 struct snd_interval t; 2085 unsigned int k; 2086 t.min = UINT_MAX; 2087 t.max = 0; 2088 t.openmin = 0; 2089 t.openmax = 0; 2090 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2091 int bits; 2092 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2093 continue; 2094 bits = snd_pcm_format_physical_width(k); 2095 if (bits <= 0) 2096 continue; /* ignore invalid formats */ 2097 if (t.min > (unsigned)bits) 2098 t.min = bits; 2099 if (t.max < (unsigned)bits) 2100 t.max = bits; 2101 } 2102 t.integer = 1; 2103 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2104 } 2105 2106 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2107 #error "Change this table" 2108 #endif 2109 2110 static const unsigned int rates[] = { 2111 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2112 48000, 64000, 88200, 96000, 176400, 192000 2113 }; 2114 2115 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2116 .count = ARRAY_SIZE(rates), 2117 .list = rates, 2118 }; 2119 2120 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2121 struct snd_pcm_hw_rule *rule) 2122 { 2123 struct snd_pcm_hardware *hw = rule->private; 2124 return snd_interval_list(hw_param_interval(params, rule->var), 2125 snd_pcm_known_rates.count, 2126 snd_pcm_known_rates.list, hw->rates); 2127 } 2128 2129 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2130 struct snd_pcm_hw_rule *rule) 2131 { 2132 struct snd_interval t; 2133 struct snd_pcm_substream *substream = rule->private; 2134 t.min = 0; 2135 t.max = substream->buffer_bytes_max; 2136 t.openmin = 0; 2137 t.openmax = 0; 2138 t.integer = 1; 2139 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2140 } 2141 2142 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2143 { 2144 struct snd_pcm_runtime *runtime = substream->runtime; 2145 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2146 int k, err; 2147 2148 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2149 snd_mask_any(constrs_mask(constrs, k)); 2150 } 2151 2152 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2153 snd_interval_any(constrs_interval(constrs, k)); 2154 } 2155 2156 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2157 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2158 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2159 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2160 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2161 2162 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2163 snd_pcm_hw_rule_format, NULL, 2164 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2165 if (err < 0) 2166 return err; 2167 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2168 snd_pcm_hw_rule_sample_bits, NULL, 2169 SNDRV_PCM_HW_PARAM_FORMAT, 2170 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2171 if (err < 0) 2172 return err; 2173 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2174 snd_pcm_hw_rule_div, NULL, 2175 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2176 if (err < 0) 2177 return err; 2178 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2179 snd_pcm_hw_rule_mul, NULL, 2180 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2181 if (err < 0) 2182 return err; 2183 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2184 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2185 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2186 if (err < 0) 2187 return err; 2188 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2189 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2190 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2191 if (err < 0) 2192 return err; 2193 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2194 snd_pcm_hw_rule_div, NULL, 2195 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2196 if (err < 0) 2197 return err; 2198 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2199 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2200 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2201 if (err < 0) 2202 return err; 2203 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2204 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2205 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2206 if (err < 0) 2207 return err; 2208 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2209 snd_pcm_hw_rule_div, NULL, 2210 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2211 if (err < 0) 2212 return err; 2213 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2214 snd_pcm_hw_rule_div, NULL, 2215 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2216 if (err < 0) 2217 return err; 2218 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2219 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2220 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2221 if (err < 0) 2222 return err; 2223 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2224 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2225 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2226 if (err < 0) 2227 return err; 2228 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2229 snd_pcm_hw_rule_mul, NULL, 2230 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2231 if (err < 0) 2232 return err; 2233 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2234 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2235 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2236 if (err < 0) 2237 return err; 2238 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2239 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2240 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2241 if (err < 0) 2242 return err; 2243 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2244 snd_pcm_hw_rule_muldivk, (void*) 8, 2245 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2246 if (err < 0) 2247 return err; 2248 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2249 snd_pcm_hw_rule_muldivk, (void*) 8, 2250 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2251 if (err < 0) 2252 return err; 2253 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2254 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2255 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2256 if (err < 0) 2257 return err; 2258 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2259 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2260 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2261 if (err < 0) 2262 return err; 2263 return 0; 2264 } 2265 2266 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2267 { 2268 struct snd_pcm_runtime *runtime = substream->runtime; 2269 struct snd_pcm_hardware *hw = &runtime->hw; 2270 int err; 2271 unsigned int mask = 0; 2272 2273 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2274 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2275 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2276 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2277 if (hw_support_mmap(substream)) { 2278 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2279 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2280 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2281 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2282 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2283 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2284 } 2285 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2286 if (err < 0) 2287 return err; 2288 2289 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2290 if (err < 0) 2291 return err; 2292 2293 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2294 if (err < 0) 2295 return err; 2296 2297 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2298 hw->channels_min, hw->channels_max); 2299 if (err < 0) 2300 return err; 2301 2302 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2303 hw->rate_min, hw->rate_max); 2304 if (err < 0) 2305 return err; 2306 2307 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2308 hw->period_bytes_min, hw->period_bytes_max); 2309 if (err < 0) 2310 return err; 2311 2312 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2313 hw->periods_min, hw->periods_max); 2314 if (err < 0) 2315 return err; 2316 2317 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2318 hw->period_bytes_min, hw->buffer_bytes_max); 2319 if (err < 0) 2320 return err; 2321 2322 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2323 snd_pcm_hw_rule_buffer_bytes_max, substream, 2324 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2325 if (err < 0) 2326 return err; 2327 2328 /* FIXME: remove */ 2329 if (runtime->dma_bytes) { 2330 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2331 if (err < 0) 2332 return err; 2333 } 2334 2335 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2336 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2337 snd_pcm_hw_rule_rate, hw, 2338 SNDRV_PCM_HW_PARAM_RATE, -1); 2339 if (err < 0) 2340 return err; 2341 } 2342 2343 /* FIXME: this belong to lowlevel */ 2344 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2345 2346 return 0; 2347 } 2348 2349 static void pcm_release_private(struct snd_pcm_substream *substream) 2350 { 2351 snd_pcm_unlink(substream); 2352 } 2353 2354 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2355 { 2356 substream->ref_count--; 2357 if (substream->ref_count > 0) 2358 return; 2359 2360 snd_pcm_drop(substream); 2361 if (substream->hw_opened) { 2362 if (substream->ops->hw_free && 2363 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2364 substream->ops->hw_free(substream); 2365 substream->ops->close(substream); 2366 substream->hw_opened = 0; 2367 } 2368 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2369 pm_qos_remove_request(&substream->latency_pm_qos_req); 2370 if (substream->pcm_release) { 2371 substream->pcm_release(substream); 2372 substream->pcm_release = NULL; 2373 } 2374 snd_pcm_detach_substream(substream); 2375 } 2376 2377 EXPORT_SYMBOL(snd_pcm_release_substream); 2378 2379 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2380 struct file *file, 2381 struct snd_pcm_substream **rsubstream) 2382 { 2383 struct snd_pcm_substream *substream; 2384 int err; 2385 2386 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2387 if (err < 0) 2388 return err; 2389 if (substream->ref_count > 1) { 2390 *rsubstream = substream; 2391 return 0; 2392 } 2393 2394 err = snd_pcm_hw_constraints_init(substream); 2395 if (err < 0) { 2396 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2397 goto error; 2398 } 2399 2400 if ((err = substream->ops->open(substream)) < 0) 2401 goto error; 2402 2403 substream->hw_opened = 1; 2404 2405 err = snd_pcm_hw_constraints_complete(substream); 2406 if (err < 0) { 2407 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2408 goto error; 2409 } 2410 2411 *rsubstream = substream; 2412 return 0; 2413 2414 error: 2415 snd_pcm_release_substream(substream); 2416 return err; 2417 } 2418 2419 EXPORT_SYMBOL(snd_pcm_open_substream); 2420 2421 static int snd_pcm_open_file(struct file *file, 2422 struct snd_pcm *pcm, 2423 int stream) 2424 { 2425 struct snd_pcm_file *pcm_file; 2426 struct snd_pcm_substream *substream; 2427 int err; 2428 2429 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2430 if (err < 0) 2431 return err; 2432 2433 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2434 if (pcm_file == NULL) { 2435 snd_pcm_release_substream(substream); 2436 return -ENOMEM; 2437 } 2438 pcm_file->substream = substream; 2439 if (substream->ref_count == 1) { 2440 substream->file = pcm_file; 2441 substream->pcm_release = pcm_release_private; 2442 } 2443 file->private_data = pcm_file; 2444 2445 return 0; 2446 } 2447 2448 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2449 { 2450 struct snd_pcm *pcm; 2451 int err = nonseekable_open(inode, file); 2452 if (err < 0) 2453 return err; 2454 pcm = snd_lookup_minor_data(iminor(inode), 2455 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2456 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2457 if (pcm) 2458 snd_card_unref(pcm->card); 2459 return err; 2460 } 2461 2462 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2463 { 2464 struct snd_pcm *pcm; 2465 int err = nonseekable_open(inode, file); 2466 if (err < 0) 2467 return err; 2468 pcm = snd_lookup_minor_data(iminor(inode), 2469 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2470 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2471 if (pcm) 2472 snd_card_unref(pcm->card); 2473 return err; 2474 } 2475 2476 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2477 { 2478 int err; 2479 wait_queue_t wait; 2480 2481 if (pcm == NULL) { 2482 err = -ENODEV; 2483 goto __error1; 2484 } 2485 err = snd_card_file_add(pcm->card, file); 2486 if (err < 0) 2487 goto __error1; 2488 if (!try_module_get(pcm->card->module)) { 2489 err = -EFAULT; 2490 goto __error2; 2491 } 2492 init_waitqueue_entry(&wait, current); 2493 add_wait_queue(&pcm->open_wait, &wait); 2494 mutex_lock(&pcm->open_mutex); 2495 while (1) { 2496 err = snd_pcm_open_file(file, pcm, stream); 2497 if (err >= 0) 2498 break; 2499 if (err == -EAGAIN) { 2500 if (file->f_flags & O_NONBLOCK) { 2501 err = -EBUSY; 2502 break; 2503 } 2504 } else 2505 break; 2506 set_current_state(TASK_INTERRUPTIBLE); 2507 mutex_unlock(&pcm->open_mutex); 2508 schedule(); 2509 mutex_lock(&pcm->open_mutex); 2510 if (pcm->card->shutdown) { 2511 err = -ENODEV; 2512 break; 2513 } 2514 if (signal_pending(current)) { 2515 err = -ERESTARTSYS; 2516 break; 2517 } 2518 } 2519 remove_wait_queue(&pcm->open_wait, &wait); 2520 mutex_unlock(&pcm->open_mutex); 2521 if (err < 0) 2522 goto __error; 2523 return err; 2524 2525 __error: 2526 module_put(pcm->card->module); 2527 __error2: 2528 snd_card_file_remove(pcm->card, file); 2529 __error1: 2530 return err; 2531 } 2532 2533 static int snd_pcm_release(struct inode *inode, struct file *file) 2534 { 2535 struct snd_pcm *pcm; 2536 struct snd_pcm_substream *substream; 2537 struct snd_pcm_file *pcm_file; 2538 2539 pcm_file = file->private_data; 2540 substream = pcm_file->substream; 2541 if (snd_BUG_ON(!substream)) 2542 return -ENXIO; 2543 pcm = substream->pcm; 2544 mutex_lock(&pcm->open_mutex); 2545 snd_pcm_release_substream(substream); 2546 kfree(pcm_file); 2547 mutex_unlock(&pcm->open_mutex); 2548 wake_up(&pcm->open_wait); 2549 module_put(pcm->card->module); 2550 snd_card_file_remove(pcm->card, file); 2551 return 0; 2552 } 2553 2554 /* check and update PCM state; return 0 or a negative error 2555 * call this inside PCM lock 2556 */ 2557 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2558 { 2559 switch (substream->runtime->status->state) { 2560 case SNDRV_PCM_STATE_DRAINING: 2561 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2562 return -EBADFD; 2563 /* Fall through */ 2564 case SNDRV_PCM_STATE_RUNNING: 2565 return snd_pcm_update_hw_ptr(substream); 2566 case SNDRV_PCM_STATE_PREPARED: 2567 case SNDRV_PCM_STATE_PAUSED: 2568 return 0; 2569 case SNDRV_PCM_STATE_SUSPENDED: 2570 return -ESTRPIPE; 2571 case SNDRV_PCM_STATE_XRUN: 2572 return -EPIPE; 2573 default: 2574 return -EBADFD; 2575 } 2576 } 2577 2578 /* increase the appl_ptr; returns the processed frames or a negative error */ 2579 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2580 snd_pcm_uframes_t frames, 2581 snd_pcm_sframes_t avail) 2582 { 2583 struct snd_pcm_runtime *runtime = substream->runtime; 2584 snd_pcm_sframes_t appl_ptr; 2585 int ret; 2586 2587 if (avail <= 0) 2588 return 0; 2589 if (frames > (snd_pcm_uframes_t)avail) 2590 frames = avail; 2591 appl_ptr = runtime->control->appl_ptr + frames; 2592 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2593 appl_ptr -= runtime->boundary; 2594 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2595 return ret < 0 ? ret : frames; 2596 } 2597 2598 /* decrease the appl_ptr; returns the processed frames or a negative error */ 2599 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2600 snd_pcm_uframes_t frames, 2601 snd_pcm_sframes_t avail) 2602 { 2603 struct snd_pcm_runtime *runtime = substream->runtime; 2604 snd_pcm_sframes_t appl_ptr; 2605 int ret; 2606 2607 if (avail <= 0) 2608 return 0; 2609 if (frames > (snd_pcm_uframes_t)avail) 2610 frames = avail; 2611 appl_ptr = runtime->control->appl_ptr - frames; 2612 if (appl_ptr < 0) 2613 appl_ptr += runtime->boundary; 2614 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2615 return ret < 0 ? ret : frames; 2616 } 2617 2618 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2619 snd_pcm_uframes_t frames) 2620 { 2621 struct snd_pcm_runtime *runtime = substream->runtime; 2622 snd_pcm_sframes_t ret; 2623 2624 if (frames == 0) 2625 return 0; 2626 2627 snd_pcm_stream_lock_irq(substream); 2628 ret = do_pcm_hwsync(substream); 2629 if (!ret) 2630 ret = rewind_appl_ptr(substream, frames, 2631 snd_pcm_playback_hw_avail(runtime)); 2632 snd_pcm_stream_unlock_irq(substream); 2633 return ret; 2634 } 2635 2636 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2637 snd_pcm_uframes_t frames) 2638 { 2639 struct snd_pcm_runtime *runtime = substream->runtime; 2640 snd_pcm_sframes_t ret; 2641 2642 if (frames == 0) 2643 return 0; 2644 2645 snd_pcm_stream_lock_irq(substream); 2646 ret = do_pcm_hwsync(substream); 2647 if (!ret) 2648 ret = rewind_appl_ptr(substream, frames, 2649 snd_pcm_capture_hw_avail(runtime)); 2650 snd_pcm_stream_unlock_irq(substream); 2651 return ret; 2652 } 2653 2654 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2655 snd_pcm_uframes_t frames) 2656 { 2657 struct snd_pcm_runtime *runtime = substream->runtime; 2658 snd_pcm_sframes_t ret; 2659 2660 if (frames == 0) 2661 return 0; 2662 2663 snd_pcm_stream_lock_irq(substream); 2664 ret = do_pcm_hwsync(substream); 2665 if (!ret) 2666 ret = forward_appl_ptr(substream, frames, 2667 snd_pcm_playback_avail(runtime)); 2668 snd_pcm_stream_unlock_irq(substream); 2669 return ret; 2670 } 2671 2672 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2673 snd_pcm_uframes_t frames) 2674 { 2675 struct snd_pcm_runtime *runtime = substream->runtime; 2676 snd_pcm_sframes_t ret; 2677 2678 if (frames == 0) 2679 return 0; 2680 2681 snd_pcm_stream_lock_irq(substream); 2682 ret = do_pcm_hwsync(substream); 2683 if (!ret) 2684 ret = forward_appl_ptr(substream, frames, 2685 snd_pcm_capture_avail(runtime)); 2686 snd_pcm_stream_unlock_irq(substream); 2687 return ret; 2688 } 2689 2690 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2691 { 2692 int err; 2693 2694 snd_pcm_stream_lock_irq(substream); 2695 err = do_pcm_hwsync(substream); 2696 snd_pcm_stream_unlock_irq(substream); 2697 return err; 2698 } 2699 2700 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream) 2701 { 2702 struct snd_pcm_runtime *runtime = substream->runtime; 2703 int err; 2704 snd_pcm_sframes_t n = 0; 2705 2706 snd_pcm_stream_lock_irq(substream); 2707 err = do_pcm_hwsync(substream); 2708 if (!err) { 2709 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2710 n = snd_pcm_playback_hw_avail(runtime); 2711 else 2712 n = snd_pcm_capture_avail(runtime); 2713 n += runtime->delay; 2714 } 2715 snd_pcm_stream_unlock_irq(substream); 2716 return err < 0 ? err : n; 2717 } 2718 2719 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2720 struct snd_pcm_sync_ptr __user *_sync_ptr) 2721 { 2722 struct snd_pcm_runtime *runtime = substream->runtime; 2723 struct snd_pcm_sync_ptr sync_ptr; 2724 volatile struct snd_pcm_mmap_status *status; 2725 volatile struct snd_pcm_mmap_control *control; 2726 int err; 2727 2728 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2729 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2730 return -EFAULT; 2731 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2732 return -EFAULT; 2733 status = runtime->status; 2734 control = runtime->control; 2735 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2736 err = snd_pcm_hwsync(substream); 2737 if (err < 0) 2738 return err; 2739 } 2740 snd_pcm_stream_lock_irq(substream); 2741 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2742 err = pcm_lib_apply_appl_ptr(substream, 2743 sync_ptr.c.control.appl_ptr); 2744 if (err < 0) { 2745 snd_pcm_stream_unlock_irq(substream); 2746 return err; 2747 } 2748 } else { 2749 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2750 } 2751 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2752 control->avail_min = sync_ptr.c.control.avail_min; 2753 else 2754 sync_ptr.c.control.avail_min = control->avail_min; 2755 sync_ptr.s.status.state = status->state; 2756 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2757 sync_ptr.s.status.tstamp = status->tstamp; 2758 sync_ptr.s.status.suspended_state = status->suspended_state; 2759 snd_pcm_stream_unlock_irq(substream); 2760 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2761 return -EFAULT; 2762 return 0; 2763 } 2764 2765 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2766 { 2767 struct snd_pcm_runtime *runtime = substream->runtime; 2768 int arg; 2769 2770 if (get_user(arg, _arg)) 2771 return -EFAULT; 2772 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2773 return -EINVAL; 2774 runtime->tstamp_type = arg; 2775 return 0; 2776 } 2777 2778 static int snd_pcm_common_ioctl(struct file *file, 2779 struct snd_pcm_substream *substream, 2780 unsigned int cmd, void __user *arg) 2781 { 2782 switch (cmd) { 2783 case SNDRV_PCM_IOCTL_PVERSION: 2784 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2785 case SNDRV_PCM_IOCTL_INFO: 2786 return snd_pcm_info_user(substream, arg); 2787 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2788 return 0; 2789 case SNDRV_PCM_IOCTL_TTSTAMP: 2790 return snd_pcm_tstamp(substream, arg); 2791 case SNDRV_PCM_IOCTL_HW_REFINE: 2792 return snd_pcm_hw_refine_user(substream, arg); 2793 case SNDRV_PCM_IOCTL_HW_PARAMS: 2794 return snd_pcm_hw_params_user(substream, arg); 2795 case SNDRV_PCM_IOCTL_HW_FREE: 2796 return snd_pcm_hw_free(substream); 2797 case SNDRV_PCM_IOCTL_SW_PARAMS: 2798 return snd_pcm_sw_params_user(substream, arg); 2799 case SNDRV_PCM_IOCTL_STATUS: 2800 return snd_pcm_status_user(substream, arg, false); 2801 case SNDRV_PCM_IOCTL_STATUS_EXT: 2802 return snd_pcm_status_user(substream, arg, true); 2803 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2804 return snd_pcm_channel_info_user(substream, arg); 2805 case SNDRV_PCM_IOCTL_PREPARE: 2806 return snd_pcm_prepare(substream, file); 2807 case SNDRV_PCM_IOCTL_RESET: 2808 return snd_pcm_reset(substream); 2809 case SNDRV_PCM_IOCTL_START: 2810 return snd_pcm_start_lock_irq(substream); 2811 case SNDRV_PCM_IOCTL_LINK: 2812 return snd_pcm_link(substream, (int)(unsigned long) arg); 2813 case SNDRV_PCM_IOCTL_UNLINK: 2814 return snd_pcm_unlink(substream); 2815 case SNDRV_PCM_IOCTL_RESUME: 2816 return snd_pcm_resume(substream); 2817 case SNDRV_PCM_IOCTL_XRUN: 2818 return snd_pcm_xrun(substream); 2819 case SNDRV_PCM_IOCTL_HWSYNC: 2820 return snd_pcm_hwsync(substream); 2821 case SNDRV_PCM_IOCTL_DELAY: 2822 { 2823 snd_pcm_sframes_t delay = snd_pcm_delay(substream); 2824 snd_pcm_sframes_t __user *res = arg; 2825 2826 if (delay < 0) 2827 return delay; 2828 if (put_user(delay, res)) 2829 return -EFAULT; 2830 return 0; 2831 } 2832 case SNDRV_PCM_IOCTL_SYNC_PTR: 2833 return snd_pcm_sync_ptr(substream, arg); 2834 #ifdef CONFIG_SND_SUPPORT_OLD_API 2835 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2836 return snd_pcm_hw_refine_old_user(substream, arg); 2837 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2838 return snd_pcm_hw_params_old_user(substream, arg); 2839 #endif 2840 case SNDRV_PCM_IOCTL_DRAIN: 2841 return snd_pcm_drain(substream, file); 2842 case SNDRV_PCM_IOCTL_DROP: 2843 return snd_pcm_drop(substream); 2844 case SNDRV_PCM_IOCTL_PAUSE: 2845 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2846 substream, 2847 (int)(unsigned long)arg); 2848 } 2849 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2850 return -ENOTTY; 2851 } 2852 2853 static int snd_pcm_common_ioctl1(struct file *file, 2854 struct snd_pcm_substream *substream, 2855 unsigned int cmd, void __user *arg) 2856 { 2857 struct snd_card *card = substream->pcm->card; 2858 int res; 2859 2860 snd_power_lock(card); 2861 res = snd_power_wait(card, SNDRV_CTL_POWER_D0); 2862 if (res >= 0) 2863 res = snd_pcm_common_ioctl(file, substream, cmd, arg); 2864 snd_power_unlock(card); 2865 return res; 2866 } 2867 2868 static int snd_pcm_playback_ioctl1(struct file *file, 2869 struct snd_pcm_substream *substream, 2870 unsigned int cmd, void __user *arg) 2871 { 2872 if (snd_BUG_ON(!substream)) 2873 return -ENXIO; 2874 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2875 return -EINVAL; 2876 switch (cmd) { 2877 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2878 { 2879 struct snd_xferi xferi; 2880 struct snd_xferi __user *_xferi = arg; 2881 struct snd_pcm_runtime *runtime = substream->runtime; 2882 snd_pcm_sframes_t result; 2883 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2884 return -EBADFD; 2885 if (put_user(0, &_xferi->result)) 2886 return -EFAULT; 2887 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2888 return -EFAULT; 2889 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2890 __put_user(result, &_xferi->result); 2891 return result < 0 ? result : 0; 2892 } 2893 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2894 { 2895 struct snd_xfern xfern; 2896 struct snd_xfern __user *_xfern = arg; 2897 struct snd_pcm_runtime *runtime = substream->runtime; 2898 void __user **bufs; 2899 snd_pcm_sframes_t result; 2900 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2901 return -EBADFD; 2902 if (runtime->channels > 128) 2903 return -EINVAL; 2904 if (put_user(0, &_xfern->result)) 2905 return -EFAULT; 2906 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2907 return -EFAULT; 2908 2909 bufs = memdup_user(xfern.bufs, 2910 sizeof(void *) * runtime->channels); 2911 if (IS_ERR(bufs)) 2912 return PTR_ERR(bufs); 2913 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2914 kfree(bufs); 2915 __put_user(result, &_xfern->result); 2916 return result < 0 ? result : 0; 2917 } 2918 case SNDRV_PCM_IOCTL_REWIND: 2919 { 2920 snd_pcm_uframes_t frames; 2921 snd_pcm_uframes_t __user *_frames = arg; 2922 snd_pcm_sframes_t result; 2923 if (get_user(frames, _frames)) 2924 return -EFAULT; 2925 if (put_user(0, _frames)) 2926 return -EFAULT; 2927 result = snd_pcm_playback_rewind(substream, frames); 2928 __put_user(result, _frames); 2929 return result < 0 ? result : 0; 2930 } 2931 case SNDRV_PCM_IOCTL_FORWARD: 2932 { 2933 snd_pcm_uframes_t frames; 2934 snd_pcm_uframes_t __user *_frames = arg; 2935 snd_pcm_sframes_t result; 2936 if (get_user(frames, _frames)) 2937 return -EFAULT; 2938 if (put_user(0, _frames)) 2939 return -EFAULT; 2940 result = snd_pcm_playback_forward(substream, frames); 2941 __put_user(result, _frames); 2942 return result < 0 ? result : 0; 2943 } 2944 } 2945 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2946 } 2947 2948 static int snd_pcm_capture_ioctl1(struct file *file, 2949 struct snd_pcm_substream *substream, 2950 unsigned int cmd, void __user *arg) 2951 { 2952 if (snd_BUG_ON(!substream)) 2953 return -ENXIO; 2954 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2955 return -EINVAL; 2956 switch (cmd) { 2957 case SNDRV_PCM_IOCTL_READI_FRAMES: 2958 { 2959 struct snd_xferi xferi; 2960 struct snd_xferi __user *_xferi = arg; 2961 struct snd_pcm_runtime *runtime = substream->runtime; 2962 snd_pcm_sframes_t result; 2963 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2964 return -EBADFD; 2965 if (put_user(0, &_xferi->result)) 2966 return -EFAULT; 2967 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2968 return -EFAULT; 2969 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2970 __put_user(result, &_xferi->result); 2971 return result < 0 ? result : 0; 2972 } 2973 case SNDRV_PCM_IOCTL_READN_FRAMES: 2974 { 2975 struct snd_xfern xfern; 2976 struct snd_xfern __user *_xfern = arg; 2977 struct snd_pcm_runtime *runtime = substream->runtime; 2978 void *bufs; 2979 snd_pcm_sframes_t result; 2980 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2981 return -EBADFD; 2982 if (runtime->channels > 128) 2983 return -EINVAL; 2984 if (put_user(0, &_xfern->result)) 2985 return -EFAULT; 2986 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2987 return -EFAULT; 2988 2989 bufs = memdup_user(xfern.bufs, 2990 sizeof(void *) * runtime->channels); 2991 if (IS_ERR(bufs)) 2992 return PTR_ERR(bufs); 2993 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2994 kfree(bufs); 2995 __put_user(result, &_xfern->result); 2996 return result < 0 ? result : 0; 2997 } 2998 case SNDRV_PCM_IOCTL_REWIND: 2999 { 3000 snd_pcm_uframes_t frames; 3001 snd_pcm_uframes_t __user *_frames = arg; 3002 snd_pcm_sframes_t result; 3003 if (get_user(frames, _frames)) 3004 return -EFAULT; 3005 if (put_user(0, _frames)) 3006 return -EFAULT; 3007 result = snd_pcm_capture_rewind(substream, frames); 3008 __put_user(result, _frames); 3009 return result < 0 ? result : 0; 3010 } 3011 case SNDRV_PCM_IOCTL_FORWARD: 3012 { 3013 snd_pcm_uframes_t frames; 3014 snd_pcm_uframes_t __user *_frames = arg; 3015 snd_pcm_sframes_t result; 3016 if (get_user(frames, _frames)) 3017 return -EFAULT; 3018 if (put_user(0, _frames)) 3019 return -EFAULT; 3020 result = snd_pcm_capture_forward(substream, frames); 3021 __put_user(result, _frames); 3022 return result < 0 ? result : 0; 3023 } 3024 } 3025 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 3026 } 3027 3028 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 3029 unsigned long arg) 3030 { 3031 struct snd_pcm_file *pcm_file; 3032 3033 pcm_file = file->private_data; 3034 3035 if (((cmd >> 8) & 0xff) != 'A') 3036 return -ENOTTY; 3037 3038 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 3039 (void __user *)arg); 3040 } 3041 3042 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 3043 unsigned long arg) 3044 { 3045 struct snd_pcm_file *pcm_file; 3046 3047 pcm_file = file->private_data; 3048 3049 if (((cmd >> 8) & 0xff) != 'A') 3050 return -ENOTTY; 3051 3052 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 3053 (void __user *)arg); 3054 } 3055 3056 /** 3057 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3058 * @substream: PCM substream 3059 * @cmd: IOCTL cmd 3060 * @arg: IOCTL argument 3061 * 3062 * The function is provided primarily for OSS layer and USB gadget drivers, 3063 * and it allows only the limited set of ioctls (hw_params, sw_params, 3064 * prepare, start, drain, drop, forward). 3065 */ 3066 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3067 unsigned int cmd, void *arg) 3068 { 3069 snd_pcm_uframes_t *frames = arg; 3070 snd_pcm_sframes_t result; 3071 3072 switch (cmd) { 3073 case SNDRV_PCM_IOCTL_FORWARD: 3074 { 3075 /* provided only for OSS; capture-only and no value returned */ 3076 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3077 return -EINVAL; 3078 result = snd_pcm_capture_forward(substream, *frames); 3079 return result < 0 ? result : 0; 3080 } 3081 case SNDRV_PCM_IOCTL_HW_PARAMS: 3082 return snd_pcm_hw_params(substream, arg); 3083 case SNDRV_PCM_IOCTL_SW_PARAMS: 3084 return snd_pcm_sw_params(substream, arg); 3085 case SNDRV_PCM_IOCTL_PREPARE: 3086 return snd_pcm_prepare(substream, NULL); 3087 case SNDRV_PCM_IOCTL_START: 3088 return snd_pcm_start_lock_irq(substream); 3089 case SNDRV_PCM_IOCTL_DRAIN: 3090 return snd_pcm_drain(substream, NULL); 3091 case SNDRV_PCM_IOCTL_DROP: 3092 return snd_pcm_drop(substream); 3093 case SNDRV_PCM_IOCTL_DELAY: 3094 { 3095 result = snd_pcm_delay(substream); 3096 if (result < 0) 3097 return result; 3098 *frames = result; 3099 return 0; 3100 } 3101 default: 3102 return -EINVAL; 3103 } 3104 } 3105 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3106 3107 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3108 loff_t * offset) 3109 { 3110 struct snd_pcm_file *pcm_file; 3111 struct snd_pcm_substream *substream; 3112 struct snd_pcm_runtime *runtime; 3113 snd_pcm_sframes_t result; 3114 3115 pcm_file = file->private_data; 3116 substream = pcm_file->substream; 3117 if (PCM_RUNTIME_CHECK(substream)) 3118 return -ENXIO; 3119 runtime = substream->runtime; 3120 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3121 return -EBADFD; 3122 if (!frame_aligned(runtime, count)) 3123 return -EINVAL; 3124 count = bytes_to_frames(runtime, count); 3125 result = snd_pcm_lib_read(substream, buf, count); 3126 if (result > 0) 3127 result = frames_to_bytes(runtime, result); 3128 return result; 3129 } 3130 3131 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3132 size_t count, loff_t * offset) 3133 { 3134 struct snd_pcm_file *pcm_file; 3135 struct snd_pcm_substream *substream; 3136 struct snd_pcm_runtime *runtime; 3137 snd_pcm_sframes_t result; 3138 3139 pcm_file = file->private_data; 3140 substream = pcm_file->substream; 3141 if (PCM_RUNTIME_CHECK(substream)) 3142 return -ENXIO; 3143 runtime = substream->runtime; 3144 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3145 return -EBADFD; 3146 if (!frame_aligned(runtime, count)) 3147 return -EINVAL; 3148 count = bytes_to_frames(runtime, count); 3149 result = snd_pcm_lib_write(substream, buf, count); 3150 if (result > 0) 3151 result = frames_to_bytes(runtime, result); 3152 return result; 3153 } 3154 3155 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3156 { 3157 struct snd_pcm_file *pcm_file; 3158 struct snd_pcm_substream *substream; 3159 struct snd_pcm_runtime *runtime; 3160 snd_pcm_sframes_t result; 3161 unsigned long i; 3162 void __user **bufs; 3163 snd_pcm_uframes_t frames; 3164 3165 pcm_file = iocb->ki_filp->private_data; 3166 substream = pcm_file->substream; 3167 if (PCM_RUNTIME_CHECK(substream)) 3168 return -ENXIO; 3169 runtime = substream->runtime; 3170 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3171 return -EBADFD; 3172 if (!iter_is_iovec(to)) 3173 return -EINVAL; 3174 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3175 return -EINVAL; 3176 if (!frame_aligned(runtime, to->iov->iov_len)) 3177 return -EINVAL; 3178 frames = bytes_to_samples(runtime, to->iov->iov_len); 3179 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3180 if (bufs == NULL) 3181 return -ENOMEM; 3182 for (i = 0; i < to->nr_segs; ++i) 3183 bufs[i] = to->iov[i].iov_base; 3184 result = snd_pcm_lib_readv(substream, bufs, frames); 3185 if (result > 0) 3186 result = frames_to_bytes(runtime, result); 3187 kfree(bufs); 3188 return result; 3189 } 3190 3191 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3192 { 3193 struct snd_pcm_file *pcm_file; 3194 struct snd_pcm_substream *substream; 3195 struct snd_pcm_runtime *runtime; 3196 snd_pcm_sframes_t result; 3197 unsigned long i; 3198 void __user **bufs; 3199 snd_pcm_uframes_t frames; 3200 3201 pcm_file = iocb->ki_filp->private_data; 3202 substream = pcm_file->substream; 3203 if (PCM_RUNTIME_CHECK(substream)) 3204 return -ENXIO; 3205 runtime = substream->runtime; 3206 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3207 return -EBADFD; 3208 if (!iter_is_iovec(from)) 3209 return -EINVAL; 3210 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3211 !frame_aligned(runtime, from->iov->iov_len)) 3212 return -EINVAL; 3213 frames = bytes_to_samples(runtime, from->iov->iov_len); 3214 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3215 if (bufs == NULL) 3216 return -ENOMEM; 3217 for (i = 0; i < from->nr_segs; ++i) 3218 bufs[i] = from->iov[i].iov_base; 3219 result = snd_pcm_lib_writev(substream, bufs, frames); 3220 if (result > 0) 3221 result = frames_to_bytes(runtime, result); 3222 kfree(bufs); 3223 return result; 3224 } 3225 3226 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3227 { 3228 struct snd_pcm_file *pcm_file; 3229 struct snd_pcm_substream *substream; 3230 struct snd_pcm_runtime *runtime; 3231 unsigned int mask; 3232 snd_pcm_uframes_t avail; 3233 3234 pcm_file = file->private_data; 3235 3236 substream = pcm_file->substream; 3237 if (PCM_RUNTIME_CHECK(substream)) 3238 return POLLOUT | POLLWRNORM | POLLERR; 3239 runtime = substream->runtime; 3240 3241 poll_wait(file, &runtime->sleep, wait); 3242 3243 snd_pcm_stream_lock_irq(substream); 3244 avail = snd_pcm_playback_avail(runtime); 3245 switch (runtime->status->state) { 3246 case SNDRV_PCM_STATE_RUNNING: 3247 case SNDRV_PCM_STATE_PREPARED: 3248 case SNDRV_PCM_STATE_PAUSED: 3249 if (avail >= runtime->control->avail_min) { 3250 mask = POLLOUT | POLLWRNORM; 3251 break; 3252 } 3253 /* Fall through */ 3254 case SNDRV_PCM_STATE_DRAINING: 3255 mask = 0; 3256 break; 3257 default: 3258 mask = POLLOUT | POLLWRNORM | POLLERR; 3259 break; 3260 } 3261 snd_pcm_stream_unlock_irq(substream); 3262 return mask; 3263 } 3264 3265 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3266 { 3267 struct snd_pcm_file *pcm_file; 3268 struct snd_pcm_substream *substream; 3269 struct snd_pcm_runtime *runtime; 3270 unsigned int mask; 3271 snd_pcm_uframes_t avail; 3272 3273 pcm_file = file->private_data; 3274 3275 substream = pcm_file->substream; 3276 if (PCM_RUNTIME_CHECK(substream)) 3277 return POLLIN | POLLRDNORM | POLLERR; 3278 runtime = substream->runtime; 3279 3280 poll_wait(file, &runtime->sleep, wait); 3281 3282 snd_pcm_stream_lock_irq(substream); 3283 avail = snd_pcm_capture_avail(runtime); 3284 switch (runtime->status->state) { 3285 case SNDRV_PCM_STATE_RUNNING: 3286 case SNDRV_PCM_STATE_PREPARED: 3287 case SNDRV_PCM_STATE_PAUSED: 3288 if (avail >= runtime->control->avail_min) { 3289 mask = POLLIN | POLLRDNORM; 3290 break; 3291 } 3292 mask = 0; 3293 break; 3294 case SNDRV_PCM_STATE_DRAINING: 3295 if (avail > 0) { 3296 mask = POLLIN | POLLRDNORM; 3297 break; 3298 } 3299 /* Fall through */ 3300 default: 3301 mask = POLLIN | POLLRDNORM | POLLERR; 3302 break; 3303 } 3304 snd_pcm_stream_unlock_irq(substream); 3305 return mask; 3306 } 3307 3308 /* 3309 * mmap support 3310 */ 3311 3312 /* 3313 * Only on coherent architectures, we can mmap the status and the control records 3314 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3315 */ 3316 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3317 /* 3318 * mmap status record 3319 */ 3320 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3321 { 3322 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3323 struct snd_pcm_runtime *runtime; 3324 3325 if (substream == NULL) 3326 return VM_FAULT_SIGBUS; 3327 runtime = substream->runtime; 3328 vmf->page = virt_to_page(runtime->status); 3329 get_page(vmf->page); 3330 return 0; 3331 } 3332 3333 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3334 { 3335 .fault = snd_pcm_mmap_status_fault, 3336 }; 3337 3338 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3339 struct vm_area_struct *area) 3340 { 3341 long size; 3342 if (!(area->vm_flags & VM_READ)) 3343 return -EINVAL; 3344 size = area->vm_end - area->vm_start; 3345 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3346 return -EINVAL; 3347 area->vm_ops = &snd_pcm_vm_ops_status; 3348 area->vm_private_data = substream; 3349 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3350 return 0; 3351 } 3352 3353 /* 3354 * mmap control record 3355 */ 3356 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3357 { 3358 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3359 struct snd_pcm_runtime *runtime; 3360 3361 if (substream == NULL) 3362 return VM_FAULT_SIGBUS; 3363 runtime = substream->runtime; 3364 vmf->page = virt_to_page(runtime->control); 3365 get_page(vmf->page); 3366 return 0; 3367 } 3368 3369 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3370 { 3371 .fault = snd_pcm_mmap_control_fault, 3372 }; 3373 3374 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3375 struct vm_area_struct *area) 3376 { 3377 long size; 3378 if (!(area->vm_flags & VM_READ)) 3379 return -EINVAL; 3380 size = area->vm_end - area->vm_start; 3381 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3382 return -EINVAL; 3383 area->vm_ops = &snd_pcm_vm_ops_control; 3384 area->vm_private_data = substream; 3385 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3386 return 0; 3387 } 3388 #else /* ! coherent mmap */ 3389 /* 3390 * don't support mmap for status and control records. 3391 */ 3392 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3393 struct vm_area_struct *area) 3394 { 3395 return -ENXIO; 3396 } 3397 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3398 struct vm_area_struct *area) 3399 { 3400 return -ENXIO; 3401 } 3402 #endif /* coherent mmap */ 3403 3404 static inline struct page * 3405 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3406 { 3407 void *vaddr = substream->runtime->dma_area + ofs; 3408 return virt_to_page(vaddr); 3409 } 3410 3411 /* 3412 * fault callback for mmapping a RAM page 3413 */ 3414 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3415 { 3416 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3417 struct snd_pcm_runtime *runtime; 3418 unsigned long offset; 3419 struct page * page; 3420 size_t dma_bytes; 3421 3422 if (substream == NULL) 3423 return VM_FAULT_SIGBUS; 3424 runtime = substream->runtime; 3425 offset = vmf->pgoff << PAGE_SHIFT; 3426 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3427 if (offset > dma_bytes - PAGE_SIZE) 3428 return VM_FAULT_SIGBUS; 3429 if (substream->ops->page) 3430 page = substream->ops->page(substream, offset); 3431 else 3432 page = snd_pcm_default_page_ops(substream, offset); 3433 if (!page) 3434 return VM_FAULT_SIGBUS; 3435 get_page(page); 3436 vmf->page = page; 3437 return 0; 3438 } 3439 3440 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3441 .open = snd_pcm_mmap_data_open, 3442 .close = snd_pcm_mmap_data_close, 3443 }; 3444 3445 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3446 .open = snd_pcm_mmap_data_open, 3447 .close = snd_pcm_mmap_data_close, 3448 .fault = snd_pcm_mmap_data_fault, 3449 }; 3450 3451 /* 3452 * mmap the DMA buffer on RAM 3453 */ 3454 3455 /** 3456 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3457 * @substream: PCM substream 3458 * @area: VMA 3459 * 3460 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3461 * this function is invoked implicitly. 3462 */ 3463 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3464 struct vm_area_struct *area) 3465 { 3466 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3467 #ifdef CONFIG_GENERIC_ALLOCATOR 3468 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3469 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3470 return remap_pfn_range(area, area->vm_start, 3471 substream->dma_buffer.addr >> PAGE_SHIFT, 3472 area->vm_end - area->vm_start, area->vm_page_prot); 3473 } 3474 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3475 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3476 if (!substream->ops->page && 3477 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3478 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3479 area, 3480 substream->runtime->dma_area, 3481 substream->runtime->dma_addr, 3482 area->vm_end - area->vm_start); 3483 #endif /* CONFIG_X86 */ 3484 /* mmap with fault handler */ 3485 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3486 return 0; 3487 } 3488 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3489 3490 /* 3491 * mmap the DMA buffer on I/O memory area 3492 */ 3493 #if SNDRV_PCM_INFO_MMAP_IOMEM 3494 /** 3495 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3496 * @substream: PCM substream 3497 * @area: VMA 3498 * 3499 * When your hardware uses the iomapped pages as the hardware buffer and 3500 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3501 * is supposed to work only on limited architectures. 3502 */ 3503 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3504 struct vm_area_struct *area) 3505 { 3506 struct snd_pcm_runtime *runtime = substream->runtime;; 3507 3508 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3509 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3510 } 3511 3512 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3513 #endif /* SNDRV_PCM_INFO_MMAP */ 3514 3515 /* 3516 * mmap DMA buffer 3517 */ 3518 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3519 struct vm_area_struct *area) 3520 { 3521 struct snd_pcm_runtime *runtime; 3522 long size; 3523 unsigned long offset; 3524 size_t dma_bytes; 3525 int err; 3526 3527 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3528 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3529 return -EINVAL; 3530 } else { 3531 if (!(area->vm_flags & VM_READ)) 3532 return -EINVAL; 3533 } 3534 runtime = substream->runtime; 3535 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3536 return -EBADFD; 3537 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3538 return -ENXIO; 3539 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3540 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3541 return -EINVAL; 3542 size = area->vm_end - area->vm_start; 3543 offset = area->vm_pgoff << PAGE_SHIFT; 3544 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3545 if ((size_t)size > dma_bytes) 3546 return -EINVAL; 3547 if (offset > dma_bytes - size) 3548 return -EINVAL; 3549 3550 area->vm_ops = &snd_pcm_vm_ops_data; 3551 area->vm_private_data = substream; 3552 if (substream->ops->mmap) 3553 err = substream->ops->mmap(substream, area); 3554 else 3555 err = snd_pcm_lib_default_mmap(substream, area); 3556 if (!err) 3557 atomic_inc(&substream->mmap_count); 3558 return err; 3559 } 3560 3561 EXPORT_SYMBOL(snd_pcm_mmap_data); 3562 3563 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3564 { 3565 struct snd_pcm_file * pcm_file; 3566 struct snd_pcm_substream *substream; 3567 unsigned long offset; 3568 3569 pcm_file = file->private_data; 3570 substream = pcm_file->substream; 3571 if (PCM_RUNTIME_CHECK(substream)) 3572 return -ENXIO; 3573 3574 offset = area->vm_pgoff << PAGE_SHIFT; 3575 switch (offset) { 3576 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3577 if (pcm_file->no_compat_mmap) 3578 return -ENXIO; 3579 return snd_pcm_mmap_status(substream, file, area); 3580 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3581 if (pcm_file->no_compat_mmap) 3582 return -ENXIO; 3583 return snd_pcm_mmap_control(substream, file, area); 3584 default: 3585 return snd_pcm_mmap_data(substream, file, area); 3586 } 3587 return 0; 3588 } 3589 3590 static int snd_pcm_fasync(int fd, struct file * file, int on) 3591 { 3592 struct snd_pcm_file * pcm_file; 3593 struct snd_pcm_substream *substream; 3594 struct snd_pcm_runtime *runtime; 3595 3596 pcm_file = file->private_data; 3597 substream = pcm_file->substream; 3598 if (PCM_RUNTIME_CHECK(substream)) 3599 return -ENXIO; 3600 runtime = substream->runtime; 3601 return fasync_helper(fd, file, on, &runtime->fasync); 3602 } 3603 3604 /* 3605 * ioctl32 compat 3606 */ 3607 #ifdef CONFIG_COMPAT 3608 #include "pcm_compat.c" 3609 #else 3610 #define snd_pcm_ioctl_compat NULL 3611 #endif 3612 3613 /* 3614 * To be removed helpers to keep binary compatibility 3615 */ 3616 3617 #ifdef CONFIG_SND_SUPPORT_OLD_API 3618 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3619 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3620 3621 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3622 struct snd_pcm_hw_params_old *oparams) 3623 { 3624 unsigned int i; 3625 3626 memset(params, 0, sizeof(*params)); 3627 params->flags = oparams->flags; 3628 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3629 params->masks[i].bits[0] = oparams->masks[i]; 3630 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3631 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3632 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3633 params->info = oparams->info; 3634 params->msbits = oparams->msbits; 3635 params->rate_num = oparams->rate_num; 3636 params->rate_den = oparams->rate_den; 3637 params->fifo_size = oparams->fifo_size; 3638 } 3639 3640 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3641 struct snd_pcm_hw_params *params) 3642 { 3643 unsigned int i; 3644 3645 memset(oparams, 0, sizeof(*oparams)); 3646 oparams->flags = params->flags; 3647 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3648 oparams->masks[i] = params->masks[i].bits[0]; 3649 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3650 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3651 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3652 oparams->info = params->info; 3653 oparams->msbits = params->msbits; 3654 oparams->rate_num = params->rate_num; 3655 oparams->rate_den = params->rate_den; 3656 oparams->fifo_size = params->fifo_size; 3657 } 3658 3659 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3660 struct snd_pcm_hw_params_old __user * _oparams) 3661 { 3662 struct snd_pcm_hw_params *params; 3663 struct snd_pcm_hw_params_old *oparams = NULL; 3664 int err; 3665 3666 params = kmalloc(sizeof(*params), GFP_KERNEL); 3667 if (!params) 3668 return -ENOMEM; 3669 3670 oparams = memdup_user(_oparams, sizeof(*oparams)); 3671 if (IS_ERR(oparams)) { 3672 err = PTR_ERR(oparams); 3673 goto out; 3674 } 3675 snd_pcm_hw_convert_from_old_params(params, oparams); 3676 err = snd_pcm_hw_refine(substream, params); 3677 if (err < 0) 3678 goto out_old; 3679 3680 err = fixup_unreferenced_params(substream, params); 3681 if (err < 0) 3682 goto out_old; 3683 3684 snd_pcm_hw_convert_to_old_params(oparams, params); 3685 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3686 err = -EFAULT; 3687 out_old: 3688 kfree(oparams); 3689 out: 3690 kfree(params); 3691 return err; 3692 } 3693 3694 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3695 struct snd_pcm_hw_params_old __user * _oparams) 3696 { 3697 struct snd_pcm_hw_params *params; 3698 struct snd_pcm_hw_params_old *oparams = NULL; 3699 int err; 3700 3701 params = kmalloc(sizeof(*params), GFP_KERNEL); 3702 if (!params) 3703 return -ENOMEM; 3704 3705 oparams = memdup_user(_oparams, sizeof(*oparams)); 3706 if (IS_ERR(oparams)) { 3707 err = PTR_ERR(oparams); 3708 goto out; 3709 } 3710 3711 snd_pcm_hw_convert_from_old_params(params, oparams); 3712 err = snd_pcm_hw_params(substream, params); 3713 if (err < 0) 3714 goto out_old; 3715 3716 snd_pcm_hw_convert_to_old_params(oparams, params); 3717 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3718 err = -EFAULT; 3719 out_old: 3720 kfree(oparams); 3721 out: 3722 kfree(params); 3723 return err; 3724 } 3725 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3726 3727 #ifndef CONFIG_MMU 3728 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3729 unsigned long addr, 3730 unsigned long len, 3731 unsigned long pgoff, 3732 unsigned long flags) 3733 { 3734 struct snd_pcm_file *pcm_file = file->private_data; 3735 struct snd_pcm_substream *substream = pcm_file->substream; 3736 struct snd_pcm_runtime *runtime = substream->runtime; 3737 unsigned long offset = pgoff << PAGE_SHIFT; 3738 3739 switch (offset) { 3740 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3741 return (unsigned long)runtime->status; 3742 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3743 return (unsigned long)runtime->control; 3744 default: 3745 return (unsigned long)runtime->dma_area + offset; 3746 } 3747 } 3748 #else 3749 # define snd_pcm_get_unmapped_area NULL 3750 #endif 3751 3752 /* 3753 * Register section 3754 */ 3755 3756 const struct file_operations snd_pcm_f_ops[2] = { 3757 { 3758 .owner = THIS_MODULE, 3759 .write = snd_pcm_write, 3760 .write_iter = snd_pcm_writev, 3761 .open = snd_pcm_playback_open, 3762 .release = snd_pcm_release, 3763 .llseek = no_llseek, 3764 .poll = snd_pcm_playback_poll, 3765 .unlocked_ioctl = snd_pcm_playback_ioctl, 3766 .compat_ioctl = snd_pcm_ioctl_compat, 3767 .mmap = snd_pcm_mmap, 3768 .fasync = snd_pcm_fasync, 3769 .get_unmapped_area = snd_pcm_get_unmapped_area, 3770 }, 3771 { 3772 .owner = THIS_MODULE, 3773 .read = snd_pcm_read, 3774 .read_iter = snd_pcm_readv, 3775 .open = snd_pcm_capture_open, 3776 .release = snd_pcm_release, 3777 .llseek = no_llseek, 3778 .poll = snd_pcm_capture_poll, 3779 .unlocked_ioctl = snd_pcm_capture_ioctl, 3780 .compat_ioctl = snd_pcm_ioctl_compat, 3781 .mmap = snd_pcm_mmap, 3782 .fasync = snd_pcm_fasync, 3783 .get_unmapped_area = snd_pcm_get_unmapped_area, 3784 } 3785 }; 3786