1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/file.h> 25 #include <linux/slab.h> 26 #include <linux/sched/signal.h> 27 #include <linux/time.h> 28 #include <linux/pm_qos.h> 29 #include <linux/io.h> 30 #include <linux/dma-mapping.h> 31 #include <sound/core.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/pcm.h> 35 #include <sound/pcm_params.h> 36 #include <sound/timer.h> 37 #include <sound/minors.h> 38 #include <linux/uio.h> 39 40 #include "pcm_local.h" 41 42 #ifdef CONFIG_SND_DEBUG 43 #define CREATE_TRACE_POINTS 44 #include "pcm_param_trace.h" 45 #else 46 #define trace_hw_mask_param_enabled() 0 47 #define trace_hw_interval_param_enabled() 0 48 #define trace_hw_mask_param(substream, type, index, prev, curr) 49 #define trace_hw_interval_param(substream, type, index, prev, curr) 50 #endif 51 52 /* 53 * Compatibility 54 */ 55 56 struct snd_pcm_hw_params_old { 57 unsigned int flags; 58 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 59 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 60 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 61 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 62 unsigned int rmask; 63 unsigned int cmask; 64 unsigned int info; 65 unsigned int msbits; 66 unsigned int rate_num; 67 unsigned int rate_den; 68 snd_pcm_uframes_t fifo_size; 69 unsigned char reserved[64]; 70 }; 71 72 #ifdef CONFIG_SND_SUPPORT_OLD_API 73 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 74 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 75 76 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 77 struct snd_pcm_hw_params_old __user * _oparams); 78 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 79 struct snd_pcm_hw_params_old __user * _oparams); 80 #endif 81 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 82 83 /* 84 * 85 */ 86 87 static DEFINE_RWLOCK(snd_pcm_link_rwlock); 88 static DECLARE_RWSEM(snd_pcm_link_rwsem); 89 90 /* Writer in rwsem may block readers even during its waiting in queue, 91 * and this may lead to a deadlock when the code path takes read sem 92 * twice (e.g. one in snd_pcm_action_nonatomic() and another in 93 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to 94 * spin until it gets the lock. 95 */ 96 static inline void down_write_nonblock(struct rw_semaphore *lock) 97 { 98 while (!down_write_trylock(lock)) 99 cond_resched(); 100 } 101 102 /** 103 * snd_pcm_stream_lock - Lock the PCM stream 104 * @substream: PCM substream 105 * 106 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 107 * flag of the given substream. This also takes the global link rw lock 108 * (or rw sem), too, for avoiding the race with linked streams. 109 */ 110 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 111 { 112 if (substream->pcm->nonatomic) { 113 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING); 114 mutex_lock(&substream->self_group.mutex); 115 } else { 116 read_lock(&snd_pcm_link_rwlock); 117 spin_lock(&substream->self_group.lock); 118 } 119 } 120 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 121 122 /** 123 * snd_pcm_stream_lock - Unlock the PCM stream 124 * @substream: PCM substream 125 * 126 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 127 */ 128 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 129 { 130 if (substream->pcm->nonatomic) { 131 mutex_unlock(&substream->self_group.mutex); 132 up_read(&snd_pcm_link_rwsem); 133 } else { 134 spin_unlock(&substream->self_group.lock); 135 read_unlock(&snd_pcm_link_rwlock); 136 } 137 } 138 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 139 140 /** 141 * snd_pcm_stream_lock_irq - Lock the PCM stream 142 * @substream: PCM substream 143 * 144 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 145 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 146 * as snd_pcm_stream_lock(). 147 */ 148 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 149 { 150 if (!substream->pcm->nonatomic) 151 local_irq_disable(); 152 snd_pcm_stream_lock(substream); 153 } 154 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 155 156 /** 157 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 158 * @substream: PCM substream 159 * 160 * This is a counter-part of snd_pcm_stream_lock_irq(). 161 */ 162 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 163 { 164 snd_pcm_stream_unlock(substream); 165 if (!substream->pcm->nonatomic) 166 local_irq_enable(); 167 } 168 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 169 170 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 171 { 172 unsigned long flags = 0; 173 if (!substream->pcm->nonatomic) 174 local_irq_save(flags); 175 snd_pcm_stream_lock(substream); 176 return flags; 177 } 178 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 179 180 /** 181 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 182 * @substream: PCM substream 183 * @flags: irq flags 184 * 185 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 186 */ 187 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 188 unsigned long flags) 189 { 190 snd_pcm_stream_unlock(substream); 191 if (!substream->pcm->nonatomic) 192 local_irq_restore(flags); 193 } 194 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 195 196 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 197 { 198 struct snd_pcm_runtime *runtime; 199 struct snd_pcm *pcm = substream->pcm; 200 struct snd_pcm_str *pstr = substream->pstr; 201 202 memset(info, 0, sizeof(*info)); 203 info->card = pcm->card->number; 204 info->device = pcm->device; 205 info->stream = substream->stream; 206 info->subdevice = substream->number; 207 strlcpy(info->id, pcm->id, sizeof(info->id)); 208 strlcpy(info->name, pcm->name, sizeof(info->name)); 209 info->dev_class = pcm->dev_class; 210 info->dev_subclass = pcm->dev_subclass; 211 info->subdevices_count = pstr->substream_count; 212 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 213 strlcpy(info->subname, substream->name, sizeof(info->subname)); 214 runtime = substream->runtime; 215 /* AB: FIXME!!! This is definitely nonsense */ 216 if (runtime) { 217 info->sync = runtime->sync; 218 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info); 219 } 220 return 0; 221 } 222 223 int snd_pcm_info_user(struct snd_pcm_substream *substream, 224 struct snd_pcm_info __user * _info) 225 { 226 struct snd_pcm_info *info; 227 int err; 228 229 info = kmalloc(sizeof(*info), GFP_KERNEL); 230 if (! info) 231 return -ENOMEM; 232 err = snd_pcm_info(substream, info); 233 if (err >= 0) { 234 if (copy_to_user(_info, info, sizeof(*info))) 235 err = -EFAULT; 236 } 237 kfree(info); 238 return err; 239 } 240 241 static bool hw_support_mmap(struct snd_pcm_substream *substream) 242 { 243 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 244 return false; 245 /* check architectures that return -EINVAL from dma_mmap_coherent() */ 246 /* FIXME: this should be some global flag */ 247 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\ 248 defined(CONFIG_PARISC) || defined(CONFIG_XTENSA) 249 if (!substream->ops->mmap && 250 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 251 return false; 252 #endif 253 return true; 254 } 255 256 static int constrain_mask_params(struct snd_pcm_substream *substream, 257 struct snd_pcm_hw_params *params) 258 { 259 struct snd_pcm_hw_constraints *constrs = 260 &substream->runtime->hw_constraints; 261 struct snd_mask *m; 262 unsigned int k; 263 struct snd_mask old_mask; 264 int changed; 265 266 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 267 m = hw_param_mask(params, k); 268 if (snd_mask_empty(m)) 269 return -EINVAL; 270 271 /* This parameter is not requested to change by a caller. */ 272 if (!(params->rmask & (1 << k))) 273 continue; 274 275 if (trace_hw_mask_param_enabled()) 276 old_mask = *m; 277 278 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 279 if (changed < 0) 280 return changed; 281 if (changed == 0) 282 continue; 283 284 /* Set corresponding flag so that the caller gets it. */ 285 trace_hw_mask_param(substream, k, 0, &old_mask, m); 286 params->cmask |= 1 << k; 287 } 288 289 return 0; 290 } 291 292 static int constrain_interval_params(struct snd_pcm_substream *substream, 293 struct snd_pcm_hw_params *params) 294 { 295 struct snd_pcm_hw_constraints *constrs = 296 &substream->runtime->hw_constraints; 297 struct snd_interval *i; 298 unsigned int k; 299 struct snd_interval old_interval; 300 int changed; 301 302 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 303 i = hw_param_interval(params, k); 304 if (snd_interval_empty(i)) 305 return -EINVAL; 306 307 /* This parameter is not requested to change by a caller. */ 308 if (!(params->rmask & (1 << k))) 309 continue; 310 311 if (trace_hw_interval_param_enabled()) 312 old_interval = *i; 313 314 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 315 if (changed < 0) 316 return changed; 317 if (changed == 0) 318 continue; 319 320 /* Set corresponding flag so that the caller gets it. */ 321 trace_hw_interval_param(substream, k, 0, &old_interval, i); 322 params->cmask |= 1 << k; 323 } 324 325 return 0; 326 } 327 328 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 329 struct snd_pcm_hw_params *params) 330 { 331 struct snd_pcm_hw_constraints *constrs = 332 &substream->runtime->hw_constraints; 333 unsigned int k; 334 unsigned int rstamps[constrs->rules_num]; 335 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 336 unsigned int stamp; 337 struct snd_pcm_hw_rule *r; 338 unsigned int d; 339 struct snd_mask old_mask; 340 struct snd_interval old_interval; 341 bool again; 342 int changed; 343 344 /* 345 * Each application of rule has own sequence number. 346 * 347 * Each member of 'rstamps' array represents the sequence number of 348 * recent application of corresponding rule. 349 */ 350 for (k = 0; k < constrs->rules_num; k++) 351 rstamps[k] = 0; 352 353 /* 354 * Each member of 'vstamps' array represents the sequence number of 355 * recent application of rule in which corresponding parameters were 356 * changed. 357 * 358 * In initial state, elements corresponding to parameters requested by 359 * a caller is 1. For unrequested parameters, corresponding members 360 * have 0 so that the parameters are never changed anymore. 361 */ 362 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 363 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 364 365 /* Due to the above design, actual sequence number starts at 2. */ 366 stamp = 2; 367 retry: 368 /* Apply all rules in order. */ 369 again = false; 370 for (k = 0; k < constrs->rules_num; k++) { 371 r = &constrs->rules[k]; 372 373 /* 374 * Check condition bits of this rule. When the rule has 375 * some condition bits, parameter without the bits is 376 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 377 * is an example of the condition bits. 378 */ 379 if (r->cond && !(r->cond & params->flags)) 380 continue; 381 382 /* 383 * The 'deps' array includes maximum three dependencies 384 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 385 * member of this array is a sentinel and should be 386 * negative value. 387 * 388 * This rule should be processed in this time when dependent 389 * parameters were changed at former applications of the other 390 * rules. 391 */ 392 for (d = 0; r->deps[d] >= 0; d++) { 393 if (vstamps[r->deps[d]] > rstamps[k]) 394 break; 395 } 396 if (r->deps[d] < 0) 397 continue; 398 399 if (trace_hw_mask_param_enabled()) { 400 if (hw_is_mask(r->var)) 401 old_mask = *hw_param_mask(params, r->var); 402 } 403 if (trace_hw_interval_param_enabled()) { 404 if (hw_is_interval(r->var)) 405 old_interval = *hw_param_interval(params, r->var); 406 } 407 408 changed = r->func(params, r); 409 if (changed < 0) 410 return changed; 411 412 /* 413 * When the parameter is changed, notify it to the caller 414 * by corresponding returned bit, then preparing for next 415 * iteration. 416 */ 417 if (changed && r->var >= 0) { 418 if (hw_is_mask(r->var)) { 419 trace_hw_mask_param(substream, r->var, 420 k + 1, &old_mask, 421 hw_param_mask(params, r->var)); 422 } 423 if (hw_is_interval(r->var)) { 424 trace_hw_interval_param(substream, r->var, 425 k + 1, &old_interval, 426 hw_param_interval(params, r->var)); 427 } 428 429 params->cmask |= (1 << r->var); 430 vstamps[r->var] = stamp; 431 again = true; 432 } 433 434 rstamps[k] = stamp++; 435 } 436 437 /* Iterate to evaluate all rules till no parameters are changed. */ 438 if (again) 439 goto retry; 440 441 return 0; 442 } 443 444 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 445 struct snd_pcm_hw_params *params) 446 { 447 const struct snd_interval *i; 448 const struct snd_mask *m; 449 int err; 450 451 if (!params->msbits) { 452 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 453 if (snd_interval_single(i)) 454 params->msbits = snd_interval_value(i); 455 } 456 457 if (!params->rate_den) { 458 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 459 if (snd_interval_single(i)) { 460 params->rate_num = snd_interval_value(i); 461 params->rate_den = 1; 462 } 463 } 464 465 if (!params->fifo_size) { 466 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 467 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 468 if (snd_mask_single(m) && snd_interval_single(i)) { 469 err = substream->ops->ioctl(substream, 470 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 471 if (err < 0) 472 return err; 473 } 474 } 475 476 if (!params->info) { 477 params->info = substream->runtime->hw.info; 478 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 479 SNDRV_PCM_INFO_DRAIN_TRIGGER); 480 if (!hw_support_mmap(substream)) 481 params->info &= ~(SNDRV_PCM_INFO_MMAP | 482 SNDRV_PCM_INFO_MMAP_VALID); 483 } 484 485 return 0; 486 } 487 488 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 489 struct snd_pcm_hw_params *params) 490 { 491 int err; 492 493 params->info = 0; 494 params->fifo_size = 0; 495 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 496 params->msbits = 0; 497 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 498 params->rate_num = 0; 499 params->rate_den = 0; 500 } 501 502 err = constrain_mask_params(substream, params); 503 if (err < 0) 504 return err; 505 506 err = constrain_interval_params(substream, params); 507 if (err < 0) 508 return err; 509 510 err = constrain_params_by_rules(substream, params); 511 if (err < 0) 512 return err; 513 514 params->rmask = 0; 515 516 return 0; 517 } 518 EXPORT_SYMBOL(snd_pcm_hw_refine); 519 520 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 521 struct snd_pcm_hw_params __user * _params) 522 { 523 struct snd_pcm_hw_params *params; 524 int err; 525 526 params = memdup_user(_params, sizeof(*params)); 527 if (IS_ERR(params)) 528 return PTR_ERR(params); 529 530 err = snd_pcm_hw_refine(substream, params); 531 if (err < 0) 532 goto end; 533 534 err = fixup_unreferenced_params(substream, params); 535 if (err < 0) 536 goto end; 537 538 if (copy_to_user(_params, params, sizeof(*params))) 539 err = -EFAULT; 540 end: 541 kfree(params); 542 return err; 543 } 544 545 static int period_to_usecs(struct snd_pcm_runtime *runtime) 546 { 547 int usecs; 548 549 if (! runtime->rate) 550 return -1; /* invalid */ 551 552 /* take 75% of period time as the deadline */ 553 usecs = (750000 / runtime->rate) * runtime->period_size; 554 usecs += ((750000 % runtime->rate) * runtime->period_size) / 555 runtime->rate; 556 557 return usecs; 558 } 559 560 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 561 { 562 snd_pcm_stream_lock_irq(substream); 563 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 564 substream->runtime->status->state = state; 565 snd_pcm_stream_unlock_irq(substream); 566 } 567 568 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 569 int event) 570 { 571 #ifdef CONFIG_SND_PCM_TIMER 572 if (substream->timer) 573 snd_timer_notify(substream->timer, event, 574 &substream->runtime->trigger_tstamp); 575 #endif 576 } 577 578 /** 579 * snd_pcm_hw_param_choose - choose a configuration defined by @params 580 * @pcm: PCM instance 581 * @params: the hw_params instance 582 * 583 * Choose one configuration from configuration space defined by @params. 584 * The configuration chosen is that obtained fixing in this order: 585 * first access, first format, first subformat, min channels, 586 * min rate, min period time, max buffer size, min tick time 587 * 588 * Return: Zero if successful, or a negative error code on failure. 589 */ 590 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 591 struct snd_pcm_hw_params *params) 592 { 593 static const int vars[] = { 594 SNDRV_PCM_HW_PARAM_ACCESS, 595 SNDRV_PCM_HW_PARAM_FORMAT, 596 SNDRV_PCM_HW_PARAM_SUBFORMAT, 597 SNDRV_PCM_HW_PARAM_CHANNELS, 598 SNDRV_PCM_HW_PARAM_RATE, 599 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 600 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 601 SNDRV_PCM_HW_PARAM_TICK_TIME, 602 -1 603 }; 604 const int *v; 605 struct snd_mask old_mask; 606 struct snd_interval old_interval; 607 int changed; 608 609 for (v = vars; *v != -1; v++) { 610 /* Keep old parameter to trace. */ 611 if (trace_hw_mask_param_enabled()) { 612 if (hw_is_mask(*v)) 613 old_mask = *hw_param_mask(params, *v); 614 } 615 if (trace_hw_interval_param_enabled()) { 616 if (hw_is_interval(*v)) 617 old_interval = *hw_param_interval(params, *v); 618 } 619 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 620 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 621 else 622 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 623 if (snd_BUG_ON(changed < 0)) 624 return changed; 625 if (changed == 0) 626 continue; 627 628 /* Trace the changed parameter. */ 629 if (hw_is_mask(*v)) { 630 trace_hw_mask_param(pcm, *v, 0, &old_mask, 631 hw_param_mask(params, *v)); 632 } 633 if (hw_is_interval(*v)) { 634 trace_hw_interval_param(pcm, *v, 0, &old_interval, 635 hw_param_interval(params, *v)); 636 } 637 } 638 639 return 0; 640 } 641 642 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 643 struct snd_pcm_hw_params *params) 644 { 645 struct snd_pcm_runtime *runtime; 646 int err, usecs; 647 unsigned int bits; 648 snd_pcm_uframes_t frames; 649 650 if (PCM_RUNTIME_CHECK(substream)) 651 return -ENXIO; 652 runtime = substream->runtime; 653 snd_pcm_stream_lock_irq(substream); 654 switch (runtime->status->state) { 655 case SNDRV_PCM_STATE_OPEN: 656 case SNDRV_PCM_STATE_SETUP: 657 case SNDRV_PCM_STATE_PREPARED: 658 break; 659 default: 660 snd_pcm_stream_unlock_irq(substream); 661 return -EBADFD; 662 } 663 snd_pcm_stream_unlock_irq(substream); 664 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 665 if (!substream->oss.oss) 666 #endif 667 if (atomic_read(&substream->mmap_count)) 668 return -EBADFD; 669 670 params->rmask = ~0U; 671 err = snd_pcm_hw_refine(substream, params); 672 if (err < 0) 673 goto _error; 674 675 err = snd_pcm_hw_params_choose(substream, params); 676 if (err < 0) 677 goto _error; 678 679 err = fixup_unreferenced_params(substream, params); 680 if (err < 0) 681 goto _error; 682 683 if (substream->ops->hw_params != NULL) { 684 err = substream->ops->hw_params(substream, params); 685 if (err < 0) 686 goto _error; 687 } 688 689 runtime->access = params_access(params); 690 runtime->format = params_format(params); 691 runtime->subformat = params_subformat(params); 692 runtime->channels = params_channels(params); 693 runtime->rate = params_rate(params); 694 runtime->period_size = params_period_size(params); 695 runtime->periods = params_periods(params); 696 runtime->buffer_size = params_buffer_size(params); 697 runtime->info = params->info; 698 runtime->rate_num = params->rate_num; 699 runtime->rate_den = params->rate_den; 700 runtime->no_period_wakeup = 701 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 702 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 703 704 bits = snd_pcm_format_physical_width(runtime->format); 705 runtime->sample_bits = bits; 706 bits *= runtime->channels; 707 runtime->frame_bits = bits; 708 frames = 1; 709 while (bits % 8 != 0) { 710 bits *= 2; 711 frames *= 2; 712 } 713 runtime->byte_align = bits / 8; 714 runtime->min_align = frames; 715 716 /* Default sw params */ 717 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 718 runtime->period_step = 1; 719 runtime->control->avail_min = runtime->period_size; 720 runtime->start_threshold = 1; 721 runtime->stop_threshold = runtime->buffer_size; 722 runtime->silence_threshold = 0; 723 runtime->silence_size = 0; 724 runtime->boundary = runtime->buffer_size; 725 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 726 runtime->boundary *= 2; 727 728 snd_pcm_timer_resolution_change(substream); 729 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 730 731 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 732 pm_qos_remove_request(&substream->latency_pm_qos_req); 733 if ((usecs = period_to_usecs(runtime)) >= 0) 734 pm_qos_add_request(&substream->latency_pm_qos_req, 735 PM_QOS_CPU_DMA_LATENCY, usecs); 736 return 0; 737 _error: 738 /* hardware might be unusable from this time, 739 so we force application to retry to set 740 the correct hardware parameter settings */ 741 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 742 if (substream->ops->hw_free != NULL) 743 substream->ops->hw_free(substream); 744 return err; 745 } 746 747 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 748 struct snd_pcm_hw_params __user * _params) 749 { 750 struct snd_pcm_hw_params *params; 751 int err; 752 753 params = memdup_user(_params, sizeof(*params)); 754 if (IS_ERR(params)) 755 return PTR_ERR(params); 756 757 err = snd_pcm_hw_params(substream, params); 758 if (err < 0) 759 goto end; 760 761 if (copy_to_user(_params, params, sizeof(*params))) 762 err = -EFAULT; 763 end: 764 kfree(params); 765 return err; 766 } 767 768 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 769 { 770 struct snd_pcm_runtime *runtime; 771 int result = 0; 772 773 if (PCM_RUNTIME_CHECK(substream)) 774 return -ENXIO; 775 runtime = substream->runtime; 776 snd_pcm_stream_lock_irq(substream); 777 switch (runtime->status->state) { 778 case SNDRV_PCM_STATE_SETUP: 779 case SNDRV_PCM_STATE_PREPARED: 780 break; 781 default: 782 snd_pcm_stream_unlock_irq(substream); 783 return -EBADFD; 784 } 785 snd_pcm_stream_unlock_irq(substream); 786 if (atomic_read(&substream->mmap_count)) 787 return -EBADFD; 788 if (substream->ops->hw_free) 789 result = substream->ops->hw_free(substream); 790 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 791 pm_qos_remove_request(&substream->latency_pm_qos_req); 792 return result; 793 } 794 795 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 796 struct snd_pcm_sw_params *params) 797 { 798 struct snd_pcm_runtime *runtime; 799 int err; 800 801 if (PCM_RUNTIME_CHECK(substream)) 802 return -ENXIO; 803 runtime = substream->runtime; 804 snd_pcm_stream_lock_irq(substream); 805 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 806 snd_pcm_stream_unlock_irq(substream); 807 return -EBADFD; 808 } 809 snd_pcm_stream_unlock_irq(substream); 810 811 if (params->tstamp_mode < 0 || 812 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 813 return -EINVAL; 814 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 815 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 816 return -EINVAL; 817 if (params->avail_min == 0) 818 return -EINVAL; 819 if (params->silence_size >= runtime->boundary) { 820 if (params->silence_threshold != 0) 821 return -EINVAL; 822 } else { 823 if (params->silence_size > params->silence_threshold) 824 return -EINVAL; 825 if (params->silence_threshold > runtime->buffer_size) 826 return -EINVAL; 827 } 828 err = 0; 829 snd_pcm_stream_lock_irq(substream); 830 runtime->tstamp_mode = params->tstamp_mode; 831 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 832 runtime->tstamp_type = params->tstamp_type; 833 runtime->period_step = params->period_step; 834 runtime->control->avail_min = params->avail_min; 835 runtime->start_threshold = params->start_threshold; 836 runtime->stop_threshold = params->stop_threshold; 837 runtime->silence_threshold = params->silence_threshold; 838 runtime->silence_size = params->silence_size; 839 params->boundary = runtime->boundary; 840 if (snd_pcm_running(substream)) { 841 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 842 runtime->silence_size > 0) 843 snd_pcm_playback_silence(substream, ULONG_MAX); 844 err = snd_pcm_update_state(substream, runtime); 845 } 846 snd_pcm_stream_unlock_irq(substream); 847 return err; 848 } 849 850 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 851 struct snd_pcm_sw_params __user * _params) 852 { 853 struct snd_pcm_sw_params params; 854 int err; 855 if (copy_from_user(¶ms, _params, sizeof(params))) 856 return -EFAULT; 857 err = snd_pcm_sw_params(substream, ¶ms); 858 if (copy_to_user(_params, ¶ms, sizeof(params))) 859 return -EFAULT; 860 return err; 861 } 862 863 int snd_pcm_status(struct snd_pcm_substream *substream, 864 struct snd_pcm_status *status) 865 { 866 struct snd_pcm_runtime *runtime = substream->runtime; 867 868 snd_pcm_stream_lock_irq(substream); 869 870 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 871 &runtime->audio_tstamp_config); 872 873 /* backwards compatible behavior */ 874 if (runtime->audio_tstamp_config.type_requested == 875 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 876 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 877 runtime->audio_tstamp_config.type_requested = 878 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 879 else 880 runtime->audio_tstamp_config.type_requested = 881 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 882 runtime->audio_tstamp_report.valid = 0; 883 } else 884 runtime->audio_tstamp_report.valid = 1; 885 886 status->state = runtime->status->state; 887 status->suspended_state = runtime->status->suspended_state; 888 if (status->state == SNDRV_PCM_STATE_OPEN) 889 goto _end; 890 status->trigger_tstamp = runtime->trigger_tstamp; 891 if (snd_pcm_running(substream)) { 892 snd_pcm_update_hw_ptr(substream); 893 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 894 status->tstamp = runtime->status->tstamp; 895 status->driver_tstamp = runtime->driver_tstamp; 896 status->audio_tstamp = 897 runtime->status->audio_tstamp; 898 if (runtime->audio_tstamp_report.valid == 1) 899 /* backwards compatibility, no report provided in COMPAT mode */ 900 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 901 &status->audio_tstamp_accuracy, 902 &runtime->audio_tstamp_report); 903 904 goto _tstamp_end; 905 } 906 } else { 907 /* get tstamp only in fallback mode and only if enabled */ 908 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 909 snd_pcm_gettime(runtime, &status->tstamp); 910 } 911 _tstamp_end: 912 status->appl_ptr = runtime->control->appl_ptr; 913 status->hw_ptr = runtime->status->hw_ptr; 914 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 915 status->avail = snd_pcm_playback_avail(runtime); 916 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 917 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 918 status->delay = runtime->buffer_size - status->avail; 919 status->delay += runtime->delay; 920 } else 921 status->delay = 0; 922 } else { 923 status->avail = snd_pcm_capture_avail(runtime); 924 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 925 status->delay = status->avail + runtime->delay; 926 else 927 status->delay = 0; 928 } 929 status->avail_max = runtime->avail_max; 930 status->overrange = runtime->overrange; 931 runtime->avail_max = 0; 932 runtime->overrange = 0; 933 _end: 934 snd_pcm_stream_unlock_irq(substream); 935 return 0; 936 } 937 938 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 939 struct snd_pcm_status __user * _status, 940 bool ext) 941 { 942 struct snd_pcm_status status; 943 int res; 944 945 memset(&status, 0, sizeof(status)); 946 /* 947 * with extension, parameters are read/write, 948 * get audio_tstamp_data from user, 949 * ignore rest of status structure 950 */ 951 if (ext && get_user(status.audio_tstamp_data, 952 (u32 __user *)(&_status->audio_tstamp_data))) 953 return -EFAULT; 954 res = snd_pcm_status(substream, &status); 955 if (res < 0) 956 return res; 957 if (copy_to_user(_status, &status, sizeof(status))) 958 return -EFAULT; 959 return 0; 960 } 961 962 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 963 struct snd_pcm_channel_info * info) 964 { 965 struct snd_pcm_runtime *runtime; 966 unsigned int channel; 967 968 channel = info->channel; 969 runtime = substream->runtime; 970 snd_pcm_stream_lock_irq(substream); 971 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 972 snd_pcm_stream_unlock_irq(substream); 973 return -EBADFD; 974 } 975 snd_pcm_stream_unlock_irq(substream); 976 if (channel >= runtime->channels) 977 return -EINVAL; 978 memset(info, 0, sizeof(*info)); 979 info->channel = channel; 980 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 981 } 982 983 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 984 struct snd_pcm_channel_info __user * _info) 985 { 986 struct snd_pcm_channel_info info; 987 int res; 988 989 if (copy_from_user(&info, _info, sizeof(info))) 990 return -EFAULT; 991 res = snd_pcm_channel_info(substream, &info); 992 if (res < 0) 993 return res; 994 if (copy_to_user(_info, &info, sizeof(info))) 995 return -EFAULT; 996 return 0; 997 } 998 999 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 1000 { 1001 struct snd_pcm_runtime *runtime = substream->runtime; 1002 if (runtime->trigger_master == NULL) 1003 return; 1004 if (runtime->trigger_master == substream) { 1005 if (!runtime->trigger_tstamp_latched) 1006 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1007 } else { 1008 snd_pcm_trigger_tstamp(runtime->trigger_master); 1009 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1010 } 1011 runtime->trigger_master = NULL; 1012 } 1013 1014 struct action_ops { 1015 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1016 int (*do_action)(struct snd_pcm_substream *substream, int state); 1017 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1018 void (*post_action)(struct snd_pcm_substream *substream, int state); 1019 }; 1020 1021 /* 1022 * this functions is core for handling of linked stream 1023 * Note: the stream state might be changed also on failure 1024 * Note2: call with calling stream lock + link lock 1025 */ 1026 static int snd_pcm_action_group(const struct action_ops *ops, 1027 struct snd_pcm_substream *substream, 1028 int state, int do_lock) 1029 { 1030 struct snd_pcm_substream *s = NULL; 1031 struct snd_pcm_substream *s1; 1032 int res = 0, depth = 1; 1033 1034 snd_pcm_group_for_each_entry(s, substream) { 1035 if (do_lock && s != substream) { 1036 if (s->pcm->nonatomic) 1037 mutex_lock_nested(&s->self_group.mutex, depth); 1038 else 1039 spin_lock_nested(&s->self_group.lock, depth); 1040 depth++; 1041 } 1042 res = ops->pre_action(s, state); 1043 if (res < 0) 1044 goto _unlock; 1045 } 1046 snd_pcm_group_for_each_entry(s, substream) { 1047 res = ops->do_action(s, state); 1048 if (res < 0) { 1049 if (ops->undo_action) { 1050 snd_pcm_group_for_each_entry(s1, substream) { 1051 if (s1 == s) /* failed stream */ 1052 break; 1053 ops->undo_action(s1, state); 1054 } 1055 } 1056 s = NULL; /* unlock all */ 1057 goto _unlock; 1058 } 1059 } 1060 snd_pcm_group_for_each_entry(s, substream) { 1061 ops->post_action(s, state); 1062 } 1063 _unlock: 1064 if (do_lock) { 1065 /* unlock streams */ 1066 snd_pcm_group_for_each_entry(s1, substream) { 1067 if (s1 != substream) { 1068 if (s1->pcm->nonatomic) 1069 mutex_unlock(&s1->self_group.mutex); 1070 else 1071 spin_unlock(&s1->self_group.lock); 1072 } 1073 if (s1 == s) /* end */ 1074 break; 1075 } 1076 } 1077 return res; 1078 } 1079 1080 /* 1081 * Note: call with stream lock 1082 */ 1083 static int snd_pcm_action_single(const struct action_ops *ops, 1084 struct snd_pcm_substream *substream, 1085 int state) 1086 { 1087 int res; 1088 1089 res = ops->pre_action(substream, state); 1090 if (res < 0) 1091 return res; 1092 res = ops->do_action(substream, state); 1093 if (res == 0) 1094 ops->post_action(substream, state); 1095 else if (ops->undo_action) 1096 ops->undo_action(substream, state); 1097 return res; 1098 } 1099 1100 /* 1101 * Note: call with stream lock 1102 */ 1103 static int snd_pcm_action(const struct action_ops *ops, 1104 struct snd_pcm_substream *substream, 1105 int state) 1106 { 1107 int res; 1108 1109 if (!snd_pcm_stream_linked(substream)) 1110 return snd_pcm_action_single(ops, substream, state); 1111 1112 if (substream->pcm->nonatomic) { 1113 if (!mutex_trylock(&substream->group->mutex)) { 1114 mutex_unlock(&substream->self_group.mutex); 1115 mutex_lock(&substream->group->mutex); 1116 mutex_lock(&substream->self_group.mutex); 1117 } 1118 res = snd_pcm_action_group(ops, substream, state, 1); 1119 mutex_unlock(&substream->group->mutex); 1120 } else { 1121 if (!spin_trylock(&substream->group->lock)) { 1122 spin_unlock(&substream->self_group.lock); 1123 spin_lock(&substream->group->lock); 1124 spin_lock(&substream->self_group.lock); 1125 } 1126 res = snd_pcm_action_group(ops, substream, state, 1); 1127 spin_unlock(&substream->group->lock); 1128 } 1129 return res; 1130 } 1131 1132 /* 1133 * Note: don't use any locks before 1134 */ 1135 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1136 struct snd_pcm_substream *substream, 1137 int state) 1138 { 1139 int res; 1140 1141 snd_pcm_stream_lock_irq(substream); 1142 res = snd_pcm_action(ops, substream, state); 1143 snd_pcm_stream_unlock_irq(substream); 1144 return res; 1145 } 1146 1147 /* 1148 */ 1149 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1150 struct snd_pcm_substream *substream, 1151 int state) 1152 { 1153 int res; 1154 1155 down_read(&snd_pcm_link_rwsem); 1156 if (snd_pcm_stream_linked(substream)) 1157 res = snd_pcm_action_group(ops, substream, state, 0); 1158 else 1159 res = snd_pcm_action_single(ops, substream, state); 1160 up_read(&snd_pcm_link_rwsem); 1161 return res; 1162 } 1163 1164 /* 1165 * start callbacks 1166 */ 1167 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1168 { 1169 struct snd_pcm_runtime *runtime = substream->runtime; 1170 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1171 return -EBADFD; 1172 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1173 !snd_pcm_playback_data(substream)) 1174 return -EPIPE; 1175 runtime->trigger_tstamp_latched = false; 1176 runtime->trigger_master = substream; 1177 return 0; 1178 } 1179 1180 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1181 { 1182 if (substream->runtime->trigger_master != substream) 1183 return 0; 1184 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1185 } 1186 1187 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1188 { 1189 if (substream->runtime->trigger_master == substream) 1190 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1191 } 1192 1193 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1194 { 1195 struct snd_pcm_runtime *runtime = substream->runtime; 1196 snd_pcm_trigger_tstamp(substream); 1197 runtime->hw_ptr_jiffies = jiffies; 1198 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1199 runtime->rate; 1200 runtime->status->state = state; 1201 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1202 runtime->silence_size > 0) 1203 snd_pcm_playback_silence(substream, ULONG_MAX); 1204 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1205 } 1206 1207 static const struct action_ops snd_pcm_action_start = { 1208 .pre_action = snd_pcm_pre_start, 1209 .do_action = snd_pcm_do_start, 1210 .undo_action = snd_pcm_undo_start, 1211 .post_action = snd_pcm_post_start 1212 }; 1213 1214 /** 1215 * snd_pcm_start - start all linked streams 1216 * @substream: the PCM substream instance 1217 * 1218 * Return: Zero if successful, or a negative error code. 1219 * The stream lock must be acquired before calling this function. 1220 */ 1221 int snd_pcm_start(struct snd_pcm_substream *substream) 1222 { 1223 return snd_pcm_action(&snd_pcm_action_start, substream, 1224 SNDRV_PCM_STATE_RUNNING); 1225 } 1226 1227 /* take the stream lock and start the streams */ 1228 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1229 { 1230 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1231 SNDRV_PCM_STATE_RUNNING); 1232 } 1233 1234 /* 1235 * stop callbacks 1236 */ 1237 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1238 { 1239 struct snd_pcm_runtime *runtime = substream->runtime; 1240 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1241 return -EBADFD; 1242 runtime->trigger_master = substream; 1243 return 0; 1244 } 1245 1246 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1247 { 1248 if (substream->runtime->trigger_master == substream && 1249 snd_pcm_running(substream)) 1250 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1251 return 0; /* unconditonally stop all substreams */ 1252 } 1253 1254 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1255 { 1256 struct snd_pcm_runtime *runtime = substream->runtime; 1257 if (runtime->status->state != state) { 1258 snd_pcm_trigger_tstamp(substream); 1259 runtime->status->state = state; 1260 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1261 } 1262 wake_up(&runtime->sleep); 1263 wake_up(&runtime->tsleep); 1264 } 1265 1266 static const struct action_ops snd_pcm_action_stop = { 1267 .pre_action = snd_pcm_pre_stop, 1268 .do_action = snd_pcm_do_stop, 1269 .post_action = snd_pcm_post_stop 1270 }; 1271 1272 /** 1273 * snd_pcm_stop - try to stop all running streams in the substream group 1274 * @substream: the PCM substream instance 1275 * @state: PCM state after stopping the stream 1276 * 1277 * The state of each stream is then changed to the given state unconditionally. 1278 * 1279 * Return: Zero if successful, or a negative error code. 1280 */ 1281 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1282 { 1283 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1284 } 1285 1286 EXPORT_SYMBOL(snd_pcm_stop); 1287 1288 /** 1289 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1290 * @substream: the PCM substream 1291 * 1292 * After stopping, the state is changed to SETUP. 1293 * Unlike snd_pcm_stop(), this affects only the given stream. 1294 * 1295 * Return: Zero if succesful, or a negative error code. 1296 */ 1297 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1298 { 1299 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1300 SNDRV_PCM_STATE_SETUP); 1301 } 1302 1303 /** 1304 * snd_pcm_stop_xrun - stop the running streams as XRUN 1305 * @substream: the PCM substream instance 1306 * 1307 * This stops the given running substream (and all linked substreams) as XRUN. 1308 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1309 * 1310 * Return: Zero if successful, or a negative error code. 1311 */ 1312 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1313 { 1314 unsigned long flags; 1315 int ret = 0; 1316 1317 snd_pcm_stream_lock_irqsave(substream, flags); 1318 if (snd_pcm_running(substream)) 1319 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1320 snd_pcm_stream_unlock_irqrestore(substream, flags); 1321 return ret; 1322 } 1323 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1324 1325 /* 1326 * pause callbacks 1327 */ 1328 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1329 { 1330 struct snd_pcm_runtime *runtime = substream->runtime; 1331 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1332 return -ENOSYS; 1333 if (push) { 1334 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1335 return -EBADFD; 1336 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1337 return -EBADFD; 1338 runtime->trigger_master = substream; 1339 return 0; 1340 } 1341 1342 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1343 { 1344 if (substream->runtime->trigger_master != substream) 1345 return 0; 1346 /* some drivers might use hw_ptr to recover from the pause - 1347 update the hw_ptr now */ 1348 if (push) 1349 snd_pcm_update_hw_ptr(substream); 1350 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1351 * a delta between the current jiffies, this gives a large enough 1352 * delta, effectively to skip the check once. 1353 */ 1354 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1355 return substream->ops->trigger(substream, 1356 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1357 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1358 } 1359 1360 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1361 { 1362 if (substream->runtime->trigger_master == substream) 1363 substream->ops->trigger(substream, 1364 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1365 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1366 } 1367 1368 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1369 { 1370 struct snd_pcm_runtime *runtime = substream->runtime; 1371 snd_pcm_trigger_tstamp(substream); 1372 if (push) { 1373 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1374 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1375 wake_up(&runtime->sleep); 1376 wake_up(&runtime->tsleep); 1377 } else { 1378 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1379 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1380 } 1381 } 1382 1383 static const struct action_ops snd_pcm_action_pause = { 1384 .pre_action = snd_pcm_pre_pause, 1385 .do_action = snd_pcm_do_pause, 1386 .undo_action = snd_pcm_undo_pause, 1387 .post_action = snd_pcm_post_pause 1388 }; 1389 1390 /* 1391 * Push/release the pause for all linked streams. 1392 */ 1393 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1394 { 1395 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1396 } 1397 1398 #ifdef CONFIG_PM 1399 /* suspend */ 1400 1401 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1402 { 1403 struct snd_pcm_runtime *runtime = substream->runtime; 1404 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1405 return -EBUSY; 1406 runtime->trigger_master = substream; 1407 return 0; 1408 } 1409 1410 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1411 { 1412 struct snd_pcm_runtime *runtime = substream->runtime; 1413 if (runtime->trigger_master != substream) 1414 return 0; 1415 if (! snd_pcm_running(substream)) 1416 return 0; 1417 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1418 return 0; /* suspend unconditionally */ 1419 } 1420 1421 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1422 { 1423 struct snd_pcm_runtime *runtime = substream->runtime; 1424 snd_pcm_trigger_tstamp(substream); 1425 runtime->status->suspended_state = runtime->status->state; 1426 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1427 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1428 wake_up(&runtime->sleep); 1429 wake_up(&runtime->tsleep); 1430 } 1431 1432 static const struct action_ops snd_pcm_action_suspend = { 1433 .pre_action = snd_pcm_pre_suspend, 1434 .do_action = snd_pcm_do_suspend, 1435 .post_action = snd_pcm_post_suspend 1436 }; 1437 1438 /** 1439 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1440 * @substream: the PCM substream 1441 * 1442 * After this call, all streams are changed to SUSPENDED state. 1443 * 1444 * Return: Zero if successful (or @substream is %NULL), or a negative error 1445 * code. 1446 */ 1447 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1448 { 1449 int err; 1450 unsigned long flags; 1451 1452 if (! substream) 1453 return 0; 1454 1455 snd_pcm_stream_lock_irqsave(substream, flags); 1456 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1457 snd_pcm_stream_unlock_irqrestore(substream, flags); 1458 return err; 1459 } 1460 1461 EXPORT_SYMBOL(snd_pcm_suspend); 1462 1463 /** 1464 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1465 * @pcm: the PCM instance 1466 * 1467 * After this call, all streams are changed to SUSPENDED state. 1468 * 1469 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1470 */ 1471 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1472 { 1473 struct snd_pcm_substream *substream; 1474 int stream, err = 0; 1475 1476 if (! pcm) 1477 return 0; 1478 1479 for (stream = 0; stream < 2; stream++) { 1480 for (substream = pcm->streams[stream].substream; 1481 substream; substream = substream->next) { 1482 /* FIXME: the open/close code should lock this as well */ 1483 if (substream->runtime == NULL) 1484 continue; 1485 err = snd_pcm_suspend(substream); 1486 if (err < 0 && err != -EBUSY) 1487 return err; 1488 } 1489 } 1490 return 0; 1491 } 1492 1493 EXPORT_SYMBOL(snd_pcm_suspend_all); 1494 1495 /* resume */ 1496 1497 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1498 { 1499 struct snd_pcm_runtime *runtime = substream->runtime; 1500 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1501 return -ENOSYS; 1502 runtime->trigger_master = substream; 1503 return 0; 1504 } 1505 1506 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1507 { 1508 struct snd_pcm_runtime *runtime = substream->runtime; 1509 if (runtime->trigger_master != substream) 1510 return 0; 1511 /* DMA not running previously? */ 1512 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1513 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1514 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1515 return 0; 1516 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1517 } 1518 1519 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1520 { 1521 if (substream->runtime->trigger_master == substream && 1522 snd_pcm_running(substream)) 1523 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1524 } 1525 1526 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1527 { 1528 struct snd_pcm_runtime *runtime = substream->runtime; 1529 snd_pcm_trigger_tstamp(substream); 1530 runtime->status->state = runtime->status->suspended_state; 1531 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1532 } 1533 1534 static const struct action_ops snd_pcm_action_resume = { 1535 .pre_action = snd_pcm_pre_resume, 1536 .do_action = snd_pcm_do_resume, 1537 .undo_action = snd_pcm_undo_resume, 1538 .post_action = snd_pcm_post_resume 1539 }; 1540 1541 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1542 { 1543 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1544 } 1545 1546 #else 1547 1548 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1549 { 1550 return -ENOSYS; 1551 } 1552 1553 #endif /* CONFIG_PM */ 1554 1555 /* 1556 * xrun ioctl 1557 * 1558 * Change the RUNNING stream(s) to XRUN state. 1559 */ 1560 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1561 { 1562 struct snd_pcm_runtime *runtime = substream->runtime; 1563 int result; 1564 1565 snd_pcm_stream_lock_irq(substream); 1566 switch (runtime->status->state) { 1567 case SNDRV_PCM_STATE_XRUN: 1568 result = 0; /* already there */ 1569 break; 1570 case SNDRV_PCM_STATE_RUNNING: 1571 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1572 break; 1573 default: 1574 result = -EBADFD; 1575 } 1576 snd_pcm_stream_unlock_irq(substream); 1577 return result; 1578 } 1579 1580 /* 1581 * reset ioctl 1582 */ 1583 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1584 { 1585 struct snd_pcm_runtime *runtime = substream->runtime; 1586 switch (runtime->status->state) { 1587 case SNDRV_PCM_STATE_RUNNING: 1588 case SNDRV_PCM_STATE_PREPARED: 1589 case SNDRV_PCM_STATE_PAUSED: 1590 case SNDRV_PCM_STATE_SUSPENDED: 1591 return 0; 1592 default: 1593 return -EBADFD; 1594 } 1595 } 1596 1597 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1598 { 1599 struct snd_pcm_runtime *runtime = substream->runtime; 1600 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1601 if (err < 0) 1602 return err; 1603 runtime->hw_ptr_base = 0; 1604 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1605 runtime->status->hw_ptr % runtime->period_size; 1606 runtime->silence_start = runtime->status->hw_ptr; 1607 runtime->silence_filled = 0; 1608 return 0; 1609 } 1610 1611 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1612 { 1613 struct snd_pcm_runtime *runtime = substream->runtime; 1614 runtime->control->appl_ptr = runtime->status->hw_ptr; 1615 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1616 runtime->silence_size > 0) 1617 snd_pcm_playback_silence(substream, ULONG_MAX); 1618 } 1619 1620 static const struct action_ops snd_pcm_action_reset = { 1621 .pre_action = snd_pcm_pre_reset, 1622 .do_action = snd_pcm_do_reset, 1623 .post_action = snd_pcm_post_reset 1624 }; 1625 1626 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1627 { 1628 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1629 } 1630 1631 /* 1632 * prepare ioctl 1633 */ 1634 /* we use the second argument for updating f_flags */ 1635 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1636 int f_flags) 1637 { 1638 struct snd_pcm_runtime *runtime = substream->runtime; 1639 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1640 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1641 return -EBADFD; 1642 if (snd_pcm_running(substream)) 1643 return -EBUSY; 1644 substream->f_flags = f_flags; 1645 return 0; 1646 } 1647 1648 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1649 { 1650 int err; 1651 err = substream->ops->prepare(substream); 1652 if (err < 0) 1653 return err; 1654 return snd_pcm_do_reset(substream, 0); 1655 } 1656 1657 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1658 { 1659 struct snd_pcm_runtime *runtime = substream->runtime; 1660 runtime->control->appl_ptr = runtime->status->hw_ptr; 1661 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1662 } 1663 1664 static const struct action_ops snd_pcm_action_prepare = { 1665 .pre_action = snd_pcm_pre_prepare, 1666 .do_action = snd_pcm_do_prepare, 1667 .post_action = snd_pcm_post_prepare 1668 }; 1669 1670 /** 1671 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1672 * @substream: the PCM substream instance 1673 * @file: file to refer f_flags 1674 * 1675 * Return: Zero if successful, or a negative error code. 1676 */ 1677 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1678 struct file *file) 1679 { 1680 int f_flags; 1681 1682 if (file) 1683 f_flags = file->f_flags; 1684 else 1685 f_flags = substream->f_flags; 1686 1687 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1688 substream, f_flags); 1689 } 1690 1691 /* 1692 * drain ioctl 1693 */ 1694 1695 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1696 { 1697 struct snd_pcm_runtime *runtime = substream->runtime; 1698 switch (runtime->status->state) { 1699 case SNDRV_PCM_STATE_OPEN: 1700 case SNDRV_PCM_STATE_DISCONNECTED: 1701 case SNDRV_PCM_STATE_SUSPENDED: 1702 return -EBADFD; 1703 } 1704 runtime->trigger_master = substream; 1705 return 0; 1706 } 1707 1708 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1709 { 1710 struct snd_pcm_runtime *runtime = substream->runtime; 1711 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1712 switch (runtime->status->state) { 1713 case SNDRV_PCM_STATE_PREPARED: 1714 /* start playback stream if possible */ 1715 if (! snd_pcm_playback_empty(substream)) { 1716 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1717 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1718 } else { 1719 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1720 } 1721 break; 1722 case SNDRV_PCM_STATE_RUNNING: 1723 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1724 break; 1725 case SNDRV_PCM_STATE_XRUN: 1726 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1727 break; 1728 default: 1729 break; 1730 } 1731 } else { 1732 /* stop running stream */ 1733 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1734 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1735 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1736 snd_pcm_do_stop(substream, new_state); 1737 snd_pcm_post_stop(substream, new_state); 1738 } 1739 } 1740 1741 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1742 runtime->trigger_master == substream && 1743 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1744 return substream->ops->trigger(substream, 1745 SNDRV_PCM_TRIGGER_DRAIN); 1746 1747 return 0; 1748 } 1749 1750 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1751 { 1752 } 1753 1754 static const struct action_ops snd_pcm_action_drain_init = { 1755 .pre_action = snd_pcm_pre_drain_init, 1756 .do_action = snd_pcm_do_drain_init, 1757 .post_action = snd_pcm_post_drain_init 1758 }; 1759 1760 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1761 1762 /* 1763 * Drain the stream(s). 1764 * When the substream is linked, sync until the draining of all playback streams 1765 * is finished. 1766 * After this call, all streams are supposed to be either SETUP or DRAINING 1767 * (capture only) state. 1768 */ 1769 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1770 struct file *file) 1771 { 1772 struct snd_card *card; 1773 struct snd_pcm_runtime *runtime; 1774 struct snd_pcm_substream *s; 1775 wait_queue_t wait; 1776 int result = 0; 1777 int nonblock = 0; 1778 1779 card = substream->pcm->card; 1780 runtime = substream->runtime; 1781 1782 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1783 return -EBADFD; 1784 1785 if (file) { 1786 if (file->f_flags & O_NONBLOCK) 1787 nonblock = 1; 1788 } else if (substream->f_flags & O_NONBLOCK) 1789 nonblock = 1; 1790 1791 down_read(&snd_pcm_link_rwsem); 1792 snd_pcm_stream_lock_irq(substream); 1793 /* resume pause */ 1794 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1795 snd_pcm_pause(substream, 0); 1796 1797 /* pre-start/stop - all running streams are changed to DRAINING state */ 1798 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1799 if (result < 0) 1800 goto unlock; 1801 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1802 if (nonblock) { 1803 result = -EAGAIN; 1804 goto unlock; 1805 } 1806 1807 for (;;) { 1808 long tout; 1809 struct snd_pcm_runtime *to_check; 1810 if (signal_pending(current)) { 1811 result = -ERESTARTSYS; 1812 break; 1813 } 1814 /* find a substream to drain */ 1815 to_check = NULL; 1816 snd_pcm_group_for_each_entry(s, substream) { 1817 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1818 continue; 1819 runtime = s->runtime; 1820 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1821 to_check = runtime; 1822 break; 1823 } 1824 } 1825 if (!to_check) 1826 break; /* all drained */ 1827 init_waitqueue_entry(&wait, current); 1828 add_wait_queue(&to_check->sleep, &wait); 1829 snd_pcm_stream_unlock_irq(substream); 1830 up_read(&snd_pcm_link_rwsem); 1831 snd_power_unlock(card); 1832 if (runtime->no_period_wakeup) 1833 tout = MAX_SCHEDULE_TIMEOUT; 1834 else { 1835 tout = 10; 1836 if (runtime->rate) { 1837 long t = runtime->period_size * 2 / runtime->rate; 1838 tout = max(t, tout); 1839 } 1840 tout = msecs_to_jiffies(tout * 1000); 1841 } 1842 tout = schedule_timeout_interruptible(tout); 1843 snd_power_lock(card); 1844 down_read(&snd_pcm_link_rwsem); 1845 snd_pcm_stream_lock_irq(substream); 1846 remove_wait_queue(&to_check->sleep, &wait); 1847 if (card->shutdown) { 1848 result = -ENODEV; 1849 break; 1850 } 1851 if (tout == 0) { 1852 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1853 result = -ESTRPIPE; 1854 else { 1855 dev_dbg(substream->pcm->card->dev, 1856 "playback drain error (DMA or IRQ trouble?)\n"); 1857 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1858 result = -EIO; 1859 } 1860 break; 1861 } 1862 } 1863 1864 unlock: 1865 snd_pcm_stream_unlock_irq(substream); 1866 up_read(&snd_pcm_link_rwsem); 1867 1868 return result; 1869 } 1870 1871 /* 1872 * drop ioctl 1873 * 1874 * Immediately put all linked substreams into SETUP state. 1875 */ 1876 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1877 { 1878 struct snd_pcm_runtime *runtime; 1879 int result = 0; 1880 1881 if (PCM_RUNTIME_CHECK(substream)) 1882 return -ENXIO; 1883 runtime = substream->runtime; 1884 1885 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1886 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1887 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1888 return -EBADFD; 1889 1890 snd_pcm_stream_lock_irq(substream); 1891 /* resume pause */ 1892 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1893 snd_pcm_pause(substream, 0); 1894 1895 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1896 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1897 snd_pcm_stream_unlock_irq(substream); 1898 1899 return result; 1900 } 1901 1902 1903 static bool is_pcm_file(struct file *file) 1904 { 1905 struct inode *inode = file_inode(file); 1906 unsigned int minor; 1907 1908 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1909 return false; 1910 minor = iminor(inode); 1911 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1912 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1913 } 1914 1915 /* 1916 * PCM link handling 1917 */ 1918 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1919 { 1920 int res = 0; 1921 struct snd_pcm_file *pcm_file; 1922 struct snd_pcm_substream *substream1; 1923 struct snd_pcm_group *group; 1924 struct fd f = fdget(fd); 1925 1926 if (!f.file) 1927 return -EBADFD; 1928 if (!is_pcm_file(f.file)) { 1929 res = -EBADFD; 1930 goto _badf; 1931 } 1932 pcm_file = f.file->private_data; 1933 substream1 = pcm_file->substream; 1934 group = kmalloc(sizeof(*group), GFP_KERNEL); 1935 if (!group) { 1936 res = -ENOMEM; 1937 goto _nolock; 1938 } 1939 down_write_nonblock(&snd_pcm_link_rwsem); 1940 write_lock_irq(&snd_pcm_link_rwlock); 1941 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1942 substream->runtime->status->state != substream1->runtime->status->state || 1943 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1944 res = -EBADFD; 1945 goto _end; 1946 } 1947 if (snd_pcm_stream_linked(substream1)) { 1948 res = -EALREADY; 1949 goto _end; 1950 } 1951 if (!snd_pcm_stream_linked(substream)) { 1952 substream->group = group; 1953 group = NULL; 1954 spin_lock_init(&substream->group->lock); 1955 mutex_init(&substream->group->mutex); 1956 INIT_LIST_HEAD(&substream->group->substreams); 1957 list_add_tail(&substream->link_list, &substream->group->substreams); 1958 substream->group->count = 1; 1959 } 1960 list_add_tail(&substream1->link_list, &substream->group->substreams); 1961 substream->group->count++; 1962 substream1->group = substream->group; 1963 _end: 1964 write_unlock_irq(&snd_pcm_link_rwlock); 1965 up_write(&snd_pcm_link_rwsem); 1966 _nolock: 1967 snd_card_unref(substream1->pcm->card); 1968 kfree(group); 1969 _badf: 1970 fdput(f); 1971 return res; 1972 } 1973 1974 static void relink_to_local(struct snd_pcm_substream *substream) 1975 { 1976 substream->group = &substream->self_group; 1977 INIT_LIST_HEAD(&substream->self_group.substreams); 1978 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1979 } 1980 1981 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1982 { 1983 struct snd_pcm_substream *s; 1984 int res = 0; 1985 1986 down_write_nonblock(&snd_pcm_link_rwsem); 1987 write_lock_irq(&snd_pcm_link_rwlock); 1988 if (!snd_pcm_stream_linked(substream)) { 1989 res = -EALREADY; 1990 goto _end; 1991 } 1992 list_del(&substream->link_list); 1993 substream->group->count--; 1994 if (substream->group->count == 1) { /* detach the last stream, too */ 1995 snd_pcm_group_for_each_entry(s, substream) { 1996 relink_to_local(s); 1997 break; 1998 } 1999 kfree(substream->group); 2000 } 2001 relink_to_local(substream); 2002 _end: 2003 write_unlock_irq(&snd_pcm_link_rwlock); 2004 up_write(&snd_pcm_link_rwsem); 2005 return res; 2006 } 2007 2008 /* 2009 * hw configurator 2010 */ 2011 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2012 struct snd_pcm_hw_rule *rule) 2013 { 2014 struct snd_interval t; 2015 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2016 hw_param_interval_c(params, rule->deps[1]), &t); 2017 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2018 } 2019 2020 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2021 struct snd_pcm_hw_rule *rule) 2022 { 2023 struct snd_interval t; 2024 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2025 hw_param_interval_c(params, rule->deps[1]), &t); 2026 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2027 } 2028 2029 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2030 struct snd_pcm_hw_rule *rule) 2031 { 2032 struct snd_interval t; 2033 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2034 hw_param_interval_c(params, rule->deps[1]), 2035 (unsigned long) rule->private, &t); 2036 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2037 } 2038 2039 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2040 struct snd_pcm_hw_rule *rule) 2041 { 2042 struct snd_interval t; 2043 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2044 (unsigned long) rule->private, 2045 hw_param_interval_c(params, rule->deps[1]), &t); 2046 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2047 } 2048 2049 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2050 struct snd_pcm_hw_rule *rule) 2051 { 2052 unsigned int k; 2053 const struct snd_interval *i = 2054 hw_param_interval_c(params, rule->deps[0]); 2055 struct snd_mask m; 2056 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2057 snd_mask_any(&m); 2058 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2059 int bits; 2060 if (! snd_mask_test(mask, k)) 2061 continue; 2062 bits = snd_pcm_format_physical_width(k); 2063 if (bits <= 0) 2064 continue; /* ignore invalid formats */ 2065 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2066 snd_mask_reset(&m, k); 2067 } 2068 return snd_mask_refine(mask, &m); 2069 } 2070 2071 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2072 struct snd_pcm_hw_rule *rule) 2073 { 2074 struct snd_interval t; 2075 unsigned int k; 2076 t.min = UINT_MAX; 2077 t.max = 0; 2078 t.openmin = 0; 2079 t.openmax = 0; 2080 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2081 int bits; 2082 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2083 continue; 2084 bits = snd_pcm_format_physical_width(k); 2085 if (bits <= 0) 2086 continue; /* ignore invalid formats */ 2087 if (t.min > (unsigned)bits) 2088 t.min = bits; 2089 if (t.max < (unsigned)bits) 2090 t.max = bits; 2091 } 2092 t.integer = 1; 2093 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2094 } 2095 2096 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2097 #error "Change this table" 2098 #endif 2099 2100 static const unsigned int rates[] = { 2101 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2102 48000, 64000, 88200, 96000, 176400, 192000 2103 }; 2104 2105 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2106 .count = ARRAY_SIZE(rates), 2107 .list = rates, 2108 }; 2109 2110 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2111 struct snd_pcm_hw_rule *rule) 2112 { 2113 struct snd_pcm_hardware *hw = rule->private; 2114 return snd_interval_list(hw_param_interval(params, rule->var), 2115 snd_pcm_known_rates.count, 2116 snd_pcm_known_rates.list, hw->rates); 2117 } 2118 2119 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2120 struct snd_pcm_hw_rule *rule) 2121 { 2122 struct snd_interval t; 2123 struct snd_pcm_substream *substream = rule->private; 2124 t.min = 0; 2125 t.max = substream->buffer_bytes_max; 2126 t.openmin = 0; 2127 t.openmax = 0; 2128 t.integer = 1; 2129 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2130 } 2131 2132 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2133 { 2134 struct snd_pcm_runtime *runtime = substream->runtime; 2135 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2136 int k, err; 2137 2138 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2139 snd_mask_any(constrs_mask(constrs, k)); 2140 } 2141 2142 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2143 snd_interval_any(constrs_interval(constrs, k)); 2144 } 2145 2146 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2147 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2148 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2149 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2150 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2151 2152 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2153 snd_pcm_hw_rule_format, NULL, 2154 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2155 if (err < 0) 2156 return err; 2157 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2158 snd_pcm_hw_rule_sample_bits, NULL, 2159 SNDRV_PCM_HW_PARAM_FORMAT, 2160 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2161 if (err < 0) 2162 return err; 2163 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2164 snd_pcm_hw_rule_div, NULL, 2165 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2166 if (err < 0) 2167 return err; 2168 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2169 snd_pcm_hw_rule_mul, NULL, 2170 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2171 if (err < 0) 2172 return err; 2173 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2174 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2175 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -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_mulkdiv, (void*) 8, 2180 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2181 if (err < 0) 2182 return err; 2183 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2184 snd_pcm_hw_rule_div, NULL, 2185 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2186 if (err < 0) 2187 return err; 2188 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2189 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2190 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2191 if (err < 0) 2192 return err; 2193 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2194 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2195 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2196 if (err < 0) 2197 return err; 2198 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2199 snd_pcm_hw_rule_div, NULL, 2200 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2201 if (err < 0) 2202 return err; 2203 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2204 snd_pcm_hw_rule_div, NULL, 2205 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2206 if (err < 0) 2207 return err; 2208 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2209 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2210 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -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_muldivk, (void*) 1000000, 2215 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2216 if (err < 0) 2217 return err; 2218 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2219 snd_pcm_hw_rule_mul, NULL, 2220 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2221 if (err < 0) 2222 return err; 2223 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2224 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2225 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -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_muldivk, (void*) 1000000, 2230 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2231 if (err < 0) 2232 return err; 2233 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2234 snd_pcm_hw_rule_muldivk, (void*) 8, 2235 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 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_BYTES, 2239 snd_pcm_hw_rule_muldivk, (void*) 8, 2240 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2241 if (err < 0) 2242 return err; 2243 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2244 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2245 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2246 if (err < 0) 2247 return err; 2248 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2249 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2250 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2251 if (err < 0) 2252 return err; 2253 return 0; 2254 } 2255 2256 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2257 { 2258 struct snd_pcm_runtime *runtime = substream->runtime; 2259 struct snd_pcm_hardware *hw = &runtime->hw; 2260 int err; 2261 unsigned int mask = 0; 2262 2263 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2264 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2265 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2266 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2267 if (hw_support_mmap(substream)) { 2268 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2269 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2270 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2271 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2272 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2273 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2274 } 2275 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2276 if (err < 0) 2277 return err; 2278 2279 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2280 if (err < 0) 2281 return err; 2282 2283 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2284 if (err < 0) 2285 return err; 2286 2287 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2288 hw->channels_min, hw->channels_max); 2289 if (err < 0) 2290 return err; 2291 2292 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2293 hw->rate_min, hw->rate_max); 2294 if (err < 0) 2295 return err; 2296 2297 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2298 hw->period_bytes_min, hw->period_bytes_max); 2299 if (err < 0) 2300 return err; 2301 2302 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2303 hw->periods_min, hw->periods_max); 2304 if (err < 0) 2305 return err; 2306 2307 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2308 hw->period_bytes_min, hw->buffer_bytes_max); 2309 if (err < 0) 2310 return err; 2311 2312 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2313 snd_pcm_hw_rule_buffer_bytes_max, substream, 2314 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2315 if (err < 0) 2316 return err; 2317 2318 /* FIXME: remove */ 2319 if (runtime->dma_bytes) { 2320 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2321 if (err < 0) 2322 return err; 2323 } 2324 2325 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2326 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2327 snd_pcm_hw_rule_rate, hw, 2328 SNDRV_PCM_HW_PARAM_RATE, -1); 2329 if (err < 0) 2330 return err; 2331 } 2332 2333 /* FIXME: this belong to lowlevel */ 2334 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2335 2336 return 0; 2337 } 2338 2339 static void pcm_release_private(struct snd_pcm_substream *substream) 2340 { 2341 snd_pcm_unlink(substream); 2342 } 2343 2344 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2345 { 2346 substream->ref_count--; 2347 if (substream->ref_count > 0) 2348 return; 2349 2350 snd_pcm_drop(substream); 2351 if (substream->hw_opened) { 2352 if (substream->ops->hw_free && 2353 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2354 substream->ops->hw_free(substream); 2355 substream->ops->close(substream); 2356 substream->hw_opened = 0; 2357 } 2358 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2359 pm_qos_remove_request(&substream->latency_pm_qos_req); 2360 if (substream->pcm_release) { 2361 substream->pcm_release(substream); 2362 substream->pcm_release = NULL; 2363 } 2364 snd_pcm_detach_substream(substream); 2365 } 2366 2367 EXPORT_SYMBOL(snd_pcm_release_substream); 2368 2369 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2370 struct file *file, 2371 struct snd_pcm_substream **rsubstream) 2372 { 2373 struct snd_pcm_substream *substream; 2374 int err; 2375 2376 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2377 if (err < 0) 2378 return err; 2379 if (substream->ref_count > 1) { 2380 *rsubstream = substream; 2381 return 0; 2382 } 2383 2384 err = snd_pcm_hw_constraints_init(substream); 2385 if (err < 0) { 2386 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2387 goto error; 2388 } 2389 2390 if ((err = substream->ops->open(substream)) < 0) 2391 goto error; 2392 2393 substream->hw_opened = 1; 2394 2395 err = snd_pcm_hw_constraints_complete(substream); 2396 if (err < 0) { 2397 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2398 goto error; 2399 } 2400 2401 *rsubstream = substream; 2402 return 0; 2403 2404 error: 2405 snd_pcm_release_substream(substream); 2406 return err; 2407 } 2408 2409 EXPORT_SYMBOL(snd_pcm_open_substream); 2410 2411 static int snd_pcm_open_file(struct file *file, 2412 struct snd_pcm *pcm, 2413 int stream) 2414 { 2415 struct snd_pcm_file *pcm_file; 2416 struct snd_pcm_substream *substream; 2417 int err; 2418 2419 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2420 if (err < 0) 2421 return err; 2422 2423 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2424 if (pcm_file == NULL) { 2425 snd_pcm_release_substream(substream); 2426 return -ENOMEM; 2427 } 2428 pcm_file->substream = substream; 2429 if (substream->ref_count == 1) { 2430 substream->file = pcm_file; 2431 substream->pcm_release = pcm_release_private; 2432 } 2433 file->private_data = pcm_file; 2434 2435 return 0; 2436 } 2437 2438 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2439 { 2440 struct snd_pcm *pcm; 2441 int err = nonseekable_open(inode, file); 2442 if (err < 0) 2443 return err; 2444 pcm = snd_lookup_minor_data(iminor(inode), 2445 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2446 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2447 if (pcm) 2448 snd_card_unref(pcm->card); 2449 return err; 2450 } 2451 2452 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2453 { 2454 struct snd_pcm *pcm; 2455 int err = nonseekable_open(inode, file); 2456 if (err < 0) 2457 return err; 2458 pcm = snd_lookup_minor_data(iminor(inode), 2459 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2460 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2461 if (pcm) 2462 snd_card_unref(pcm->card); 2463 return err; 2464 } 2465 2466 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2467 { 2468 int err; 2469 wait_queue_t wait; 2470 2471 if (pcm == NULL) { 2472 err = -ENODEV; 2473 goto __error1; 2474 } 2475 err = snd_card_file_add(pcm->card, file); 2476 if (err < 0) 2477 goto __error1; 2478 if (!try_module_get(pcm->card->module)) { 2479 err = -EFAULT; 2480 goto __error2; 2481 } 2482 init_waitqueue_entry(&wait, current); 2483 add_wait_queue(&pcm->open_wait, &wait); 2484 mutex_lock(&pcm->open_mutex); 2485 while (1) { 2486 err = snd_pcm_open_file(file, pcm, stream); 2487 if (err >= 0) 2488 break; 2489 if (err == -EAGAIN) { 2490 if (file->f_flags & O_NONBLOCK) { 2491 err = -EBUSY; 2492 break; 2493 } 2494 } else 2495 break; 2496 set_current_state(TASK_INTERRUPTIBLE); 2497 mutex_unlock(&pcm->open_mutex); 2498 schedule(); 2499 mutex_lock(&pcm->open_mutex); 2500 if (pcm->card->shutdown) { 2501 err = -ENODEV; 2502 break; 2503 } 2504 if (signal_pending(current)) { 2505 err = -ERESTARTSYS; 2506 break; 2507 } 2508 } 2509 remove_wait_queue(&pcm->open_wait, &wait); 2510 mutex_unlock(&pcm->open_mutex); 2511 if (err < 0) 2512 goto __error; 2513 return err; 2514 2515 __error: 2516 module_put(pcm->card->module); 2517 __error2: 2518 snd_card_file_remove(pcm->card, file); 2519 __error1: 2520 return err; 2521 } 2522 2523 static int snd_pcm_release(struct inode *inode, struct file *file) 2524 { 2525 struct snd_pcm *pcm; 2526 struct snd_pcm_substream *substream; 2527 struct snd_pcm_file *pcm_file; 2528 2529 pcm_file = file->private_data; 2530 substream = pcm_file->substream; 2531 if (snd_BUG_ON(!substream)) 2532 return -ENXIO; 2533 pcm = substream->pcm; 2534 mutex_lock(&pcm->open_mutex); 2535 snd_pcm_release_substream(substream); 2536 kfree(pcm_file); 2537 mutex_unlock(&pcm->open_mutex); 2538 wake_up(&pcm->open_wait); 2539 module_put(pcm->card->module); 2540 snd_card_file_remove(pcm->card, file); 2541 return 0; 2542 } 2543 2544 /* check and update PCM state; return 0 or a negative error 2545 * call this inside PCM lock 2546 */ 2547 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2548 { 2549 switch (substream->runtime->status->state) { 2550 case SNDRV_PCM_STATE_DRAINING: 2551 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2552 return -EBADFD; 2553 /* Fall through */ 2554 case SNDRV_PCM_STATE_RUNNING: 2555 return snd_pcm_update_hw_ptr(substream); 2556 case SNDRV_PCM_STATE_PREPARED: 2557 case SNDRV_PCM_STATE_PAUSED: 2558 return 0; 2559 case SNDRV_PCM_STATE_SUSPENDED: 2560 return -ESTRPIPE; 2561 case SNDRV_PCM_STATE_XRUN: 2562 return -EPIPE; 2563 default: 2564 return -EBADFD; 2565 } 2566 } 2567 2568 /* increase the appl_ptr; returns the processed frames or a negative error */ 2569 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2570 snd_pcm_uframes_t frames, 2571 snd_pcm_sframes_t avail) 2572 { 2573 struct snd_pcm_runtime *runtime = substream->runtime; 2574 snd_pcm_sframes_t appl_ptr; 2575 int ret; 2576 2577 if (avail <= 0) 2578 return 0; 2579 if (frames > (snd_pcm_uframes_t)avail) 2580 frames = avail; 2581 appl_ptr = runtime->control->appl_ptr + frames; 2582 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2583 appl_ptr -= runtime->boundary; 2584 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2585 return ret < 0 ? ret : frames; 2586 } 2587 2588 /* decrease the appl_ptr; returns the processed frames or a negative error */ 2589 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2590 snd_pcm_uframes_t frames, 2591 snd_pcm_sframes_t avail) 2592 { 2593 struct snd_pcm_runtime *runtime = substream->runtime; 2594 snd_pcm_sframes_t appl_ptr; 2595 int ret; 2596 2597 if (avail <= 0) 2598 return 0; 2599 if (frames > (snd_pcm_uframes_t)avail) 2600 frames = avail; 2601 appl_ptr = runtime->control->appl_ptr - frames; 2602 if (appl_ptr < 0) 2603 appl_ptr += runtime->boundary; 2604 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2605 return ret < 0 ? ret : frames; 2606 } 2607 2608 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2609 snd_pcm_uframes_t frames) 2610 { 2611 struct snd_pcm_runtime *runtime = substream->runtime; 2612 snd_pcm_sframes_t ret; 2613 2614 if (frames == 0) 2615 return 0; 2616 2617 snd_pcm_stream_lock_irq(substream); 2618 ret = do_pcm_hwsync(substream); 2619 if (!ret) 2620 ret = rewind_appl_ptr(substream, frames, 2621 snd_pcm_playback_hw_avail(runtime)); 2622 snd_pcm_stream_unlock_irq(substream); 2623 return ret; 2624 } 2625 2626 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2627 snd_pcm_uframes_t frames) 2628 { 2629 struct snd_pcm_runtime *runtime = substream->runtime; 2630 snd_pcm_sframes_t ret; 2631 2632 if (frames == 0) 2633 return 0; 2634 2635 snd_pcm_stream_lock_irq(substream); 2636 ret = do_pcm_hwsync(substream); 2637 if (!ret) 2638 ret = rewind_appl_ptr(substream, frames, 2639 snd_pcm_capture_hw_avail(runtime)); 2640 snd_pcm_stream_unlock_irq(substream); 2641 return ret; 2642 } 2643 2644 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2645 snd_pcm_uframes_t frames) 2646 { 2647 struct snd_pcm_runtime *runtime = substream->runtime; 2648 snd_pcm_sframes_t ret; 2649 2650 if (frames == 0) 2651 return 0; 2652 2653 snd_pcm_stream_lock_irq(substream); 2654 ret = do_pcm_hwsync(substream); 2655 if (!ret) 2656 ret = forward_appl_ptr(substream, frames, 2657 snd_pcm_playback_avail(runtime)); 2658 snd_pcm_stream_unlock_irq(substream); 2659 return ret; 2660 } 2661 2662 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2663 snd_pcm_uframes_t frames) 2664 { 2665 struct snd_pcm_runtime *runtime = substream->runtime; 2666 snd_pcm_sframes_t ret; 2667 2668 if (frames == 0) 2669 return 0; 2670 2671 snd_pcm_stream_lock_irq(substream); 2672 ret = do_pcm_hwsync(substream); 2673 if (!ret) 2674 ret = forward_appl_ptr(substream, frames, 2675 snd_pcm_capture_avail(runtime)); 2676 snd_pcm_stream_unlock_irq(substream); 2677 return ret; 2678 } 2679 2680 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2681 { 2682 int err; 2683 2684 snd_pcm_stream_lock_irq(substream); 2685 err = do_pcm_hwsync(substream); 2686 snd_pcm_stream_unlock_irq(substream); 2687 return err; 2688 } 2689 2690 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream) 2691 { 2692 struct snd_pcm_runtime *runtime = substream->runtime; 2693 int err; 2694 snd_pcm_sframes_t n = 0; 2695 2696 snd_pcm_stream_lock_irq(substream); 2697 err = do_pcm_hwsync(substream); 2698 if (!err) { 2699 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2700 n = snd_pcm_playback_hw_avail(runtime); 2701 else 2702 n = snd_pcm_capture_avail(runtime); 2703 n += runtime->delay; 2704 } 2705 snd_pcm_stream_unlock_irq(substream); 2706 return err < 0 ? err : n; 2707 } 2708 2709 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2710 struct snd_pcm_sync_ptr __user *_sync_ptr) 2711 { 2712 struct snd_pcm_runtime *runtime = substream->runtime; 2713 struct snd_pcm_sync_ptr sync_ptr; 2714 volatile struct snd_pcm_mmap_status *status; 2715 volatile struct snd_pcm_mmap_control *control; 2716 int err; 2717 2718 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2719 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2720 return -EFAULT; 2721 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2722 return -EFAULT; 2723 status = runtime->status; 2724 control = runtime->control; 2725 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2726 err = snd_pcm_hwsync(substream); 2727 if (err < 0) 2728 return err; 2729 } 2730 snd_pcm_stream_lock_irq(substream); 2731 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2732 err = pcm_lib_apply_appl_ptr(substream, 2733 sync_ptr.c.control.appl_ptr); 2734 if (err < 0) { 2735 snd_pcm_stream_unlock_irq(substream); 2736 return err; 2737 } 2738 } else { 2739 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2740 } 2741 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2742 control->avail_min = sync_ptr.c.control.avail_min; 2743 else 2744 sync_ptr.c.control.avail_min = control->avail_min; 2745 sync_ptr.s.status.state = status->state; 2746 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2747 sync_ptr.s.status.tstamp = status->tstamp; 2748 sync_ptr.s.status.suspended_state = status->suspended_state; 2749 snd_pcm_stream_unlock_irq(substream); 2750 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2751 return -EFAULT; 2752 return 0; 2753 } 2754 2755 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2756 { 2757 struct snd_pcm_runtime *runtime = substream->runtime; 2758 int arg; 2759 2760 if (get_user(arg, _arg)) 2761 return -EFAULT; 2762 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2763 return -EINVAL; 2764 runtime->tstamp_type = arg; 2765 return 0; 2766 } 2767 2768 static int snd_pcm_common_ioctl(struct file *file, 2769 struct snd_pcm_substream *substream, 2770 unsigned int cmd, void __user *arg) 2771 { 2772 switch (cmd) { 2773 case SNDRV_PCM_IOCTL_PVERSION: 2774 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2775 case SNDRV_PCM_IOCTL_INFO: 2776 return snd_pcm_info_user(substream, arg); 2777 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2778 return 0; 2779 case SNDRV_PCM_IOCTL_TTSTAMP: 2780 return snd_pcm_tstamp(substream, arg); 2781 case SNDRV_PCM_IOCTL_HW_REFINE: 2782 return snd_pcm_hw_refine_user(substream, arg); 2783 case SNDRV_PCM_IOCTL_HW_PARAMS: 2784 return snd_pcm_hw_params_user(substream, arg); 2785 case SNDRV_PCM_IOCTL_HW_FREE: 2786 return snd_pcm_hw_free(substream); 2787 case SNDRV_PCM_IOCTL_SW_PARAMS: 2788 return snd_pcm_sw_params_user(substream, arg); 2789 case SNDRV_PCM_IOCTL_STATUS: 2790 return snd_pcm_status_user(substream, arg, false); 2791 case SNDRV_PCM_IOCTL_STATUS_EXT: 2792 return snd_pcm_status_user(substream, arg, true); 2793 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2794 return snd_pcm_channel_info_user(substream, arg); 2795 case SNDRV_PCM_IOCTL_PREPARE: 2796 return snd_pcm_prepare(substream, file); 2797 case SNDRV_PCM_IOCTL_RESET: 2798 return snd_pcm_reset(substream); 2799 case SNDRV_PCM_IOCTL_START: 2800 return snd_pcm_start_lock_irq(substream); 2801 case SNDRV_PCM_IOCTL_LINK: 2802 return snd_pcm_link(substream, (int)(unsigned long) arg); 2803 case SNDRV_PCM_IOCTL_UNLINK: 2804 return snd_pcm_unlink(substream); 2805 case SNDRV_PCM_IOCTL_RESUME: 2806 return snd_pcm_resume(substream); 2807 case SNDRV_PCM_IOCTL_XRUN: 2808 return snd_pcm_xrun(substream); 2809 case SNDRV_PCM_IOCTL_HWSYNC: 2810 return snd_pcm_hwsync(substream); 2811 case SNDRV_PCM_IOCTL_DELAY: 2812 { 2813 snd_pcm_sframes_t delay = snd_pcm_delay(substream); 2814 snd_pcm_sframes_t __user *res = arg; 2815 2816 if (delay < 0) 2817 return delay; 2818 if (put_user(delay, res)) 2819 return -EFAULT; 2820 return 0; 2821 } 2822 case SNDRV_PCM_IOCTL_SYNC_PTR: 2823 return snd_pcm_sync_ptr(substream, arg); 2824 #ifdef CONFIG_SND_SUPPORT_OLD_API 2825 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2826 return snd_pcm_hw_refine_old_user(substream, arg); 2827 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2828 return snd_pcm_hw_params_old_user(substream, arg); 2829 #endif 2830 case SNDRV_PCM_IOCTL_DRAIN: 2831 return snd_pcm_drain(substream, file); 2832 case SNDRV_PCM_IOCTL_DROP: 2833 return snd_pcm_drop(substream); 2834 case SNDRV_PCM_IOCTL_PAUSE: 2835 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2836 substream, 2837 (int)(unsigned long)arg); 2838 } 2839 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2840 return -ENOTTY; 2841 } 2842 2843 static int snd_pcm_common_ioctl1(struct file *file, 2844 struct snd_pcm_substream *substream, 2845 unsigned int cmd, void __user *arg) 2846 { 2847 struct snd_card *card = substream->pcm->card; 2848 int res; 2849 2850 snd_power_lock(card); 2851 res = snd_power_wait(card, SNDRV_CTL_POWER_D0); 2852 if (res >= 0) 2853 res = snd_pcm_common_ioctl(file, substream, cmd, arg); 2854 snd_power_unlock(card); 2855 return res; 2856 } 2857 2858 static int snd_pcm_playback_ioctl1(struct file *file, 2859 struct snd_pcm_substream *substream, 2860 unsigned int cmd, void __user *arg) 2861 { 2862 if (snd_BUG_ON(!substream)) 2863 return -ENXIO; 2864 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2865 return -EINVAL; 2866 switch (cmd) { 2867 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2868 { 2869 struct snd_xferi xferi; 2870 struct snd_xferi __user *_xferi = arg; 2871 struct snd_pcm_runtime *runtime = substream->runtime; 2872 snd_pcm_sframes_t result; 2873 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2874 return -EBADFD; 2875 if (put_user(0, &_xferi->result)) 2876 return -EFAULT; 2877 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2878 return -EFAULT; 2879 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2880 __put_user(result, &_xferi->result); 2881 return result < 0 ? result : 0; 2882 } 2883 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2884 { 2885 struct snd_xfern xfern; 2886 struct snd_xfern __user *_xfern = arg; 2887 struct snd_pcm_runtime *runtime = substream->runtime; 2888 void __user **bufs; 2889 snd_pcm_sframes_t result; 2890 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2891 return -EBADFD; 2892 if (runtime->channels > 128) 2893 return -EINVAL; 2894 if (put_user(0, &_xfern->result)) 2895 return -EFAULT; 2896 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2897 return -EFAULT; 2898 2899 bufs = memdup_user(xfern.bufs, 2900 sizeof(void *) * runtime->channels); 2901 if (IS_ERR(bufs)) 2902 return PTR_ERR(bufs); 2903 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2904 kfree(bufs); 2905 __put_user(result, &_xfern->result); 2906 return result < 0 ? result : 0; 2907 } 2908 case SNDRV_PCM_IOCTL_REWIND: 2909 { 2910 snd_pcm_uframes_t frames; 2911 snd_pcm_uframes_t __user *_frames = arg; 2912 snd_pcm_sframes_t result; 2913 if (get_user(frames, _frames)) 2914 return -EFAULT; 2915 if (put_user(0, _frames)) 2916 return -EFAULT; 2917 result = snd_pcm_playback_rewind(substream, frames); 2918 __put_user(result, _frames); 2919 return result < 0 ? result : 0; 2920 } 2921 case SNDRV_PCM_IOCTL_FORWARD: 2922 { 2923 snd_pcm_uframes_t frames; 2924 snd_pcm_uframes_t __user *_frames = arg; 2925 snd_pcm_sframes_t result; 2926 if (get_user(frames, _frames)) 2927 return -EFAULT; 2928 if (put_user(0, _frames)) 2929 return -EFAULT; 2930 result = snd_pcm_playback_forward(substream, frames); 2931 __put_user(result, _frames); 2932 return result < 0 ? result : 0; 2933 } 2934 } 2935 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2936 } 2937 2938 static int snd_pcm_capture_ioctl1(struct file *file, 2939 struct snd_pcm_substream *substream, 2940 unsigned int cmd, void __user *arg) 2941 { 2942 if (snd_BUG_ON(!substream)) 2943 return -ENXIO; 2944 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2945 return -EINVAL; 2946 switch (cmd) { 2947 case SNDRV_PCM_IOCTL_READI_FRAMES: 2948 { 2949 struct snd_xferi xferi; 2950 struct snd_xferi __user *_xferi = arg; 2951 struct snd_pcm_runtime *runtime = substream->runtime; 2952 snd_pcm_sframes_t result; 2953 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2954 return -EBADFD; 2955 if (put_user(0, &_xferi->result)) 2956 return -EFAULT; 2957 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2958 return -EFAULT; 2959 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2960 __put_user(result, &_xferi->result); 2961 return result < 0 ? result : 0; 2962 } 2963 case SNDRV_PCM_IOCTL_READN_FRAMES: 2964 { 2965 struct snd_xfern xfern; 2966 struct snd_xfern __user *_xfern = arg; 2967 struct snd_pcm_runtime *runtime = substream->runtime; 2968 void *bufs; 2969 snd_pcm_sframes_t result; 2970 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2971 return -EBADFD; 2972 if (runtime->channels > 128) 2973 return -EINVAL; 2974 if (put_user(0, &_xfern->result)) 2975 return -EFAULT; 2976 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2977 return -EFAULT; 2978 2979 bufs = memdup_user(xfern.bufs, 2980 sizeof(void *) * runtime->channels); 2981 if (IS_ERR(bufs)) 2982 return PTR_ERR(bufs); 2983 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2984 kfree(bufs); 2985 __put_user(result, &_xfern->result); 2986 return result < 0 ? result : 0; 2987 } 2988 case SNDRV_PCM_IOCTL_REWIND: 2989 { 2990 snd_pcm_uframes_t frames; 2991 snd_pcm_uframes_t __user *_frames = arg; 2992 snd_pcm_sframes_t result; 2993 if (get_user(frames, _frames)) 2994 return -EFAULT; 2995 if (put_user(0, _frames)) 2996 return -EFAULT; 2997 result = snd_pcm_capture_rewind(substream, frames); 2998 __put_user(result, _frames); 2999 return result < 0 ? result : 0; 3000 } 3001 case SNDRV_PCM_IOCTL_FORWARD: 3002 { 3003 snd_pcm_uframes_t frames; 3004 snd_pcm_uframes_t __user *_frames = arg; 3005 snd_pcm_sframes_t result; 3006 if (get_user(frames, _frames)) 3007 return -EFAULT; 3008 if (put_user(0, _frames)) 3009 return -EFAULT; 3010 result = snd_pcm_capture_forward(substream, frames); 3011 __put_user(result, _frames); 3012 return result < 0 ? result : 0; 3013 } 3014 } 3015 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 3016 } 3017 3018 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 3019 unsigned long arg) 3020 { 3021 struct snd_pcm_file *pcm_file; 3022 3023 pcm_file = file->private_data; 3024 3025 if (((cmd >> 8) & 0xff) != 'A') 3026 return -ENOTTY; 3027 3028 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 3029 (void __user *)arg); 3030 } 3031 3032 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 3033 unsigned long arg) 3034 { 3035 struct snd_pcm_file *pcm_file; 3036 3037 pcm_file = file->private_data; 3038 3039 if (((cmd >> 8) & 0xff) != 'A') 3040 return -ENOTTY; 3041 3042 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 3043 (void __user *)arg); 3044 } 3045 3046 /** 3047 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3048 * @substream: PCM substream 3049 * @cmd: IOCTL cmd 3050 * @arg: IOCTL argument 3051 * 3052 * The function is provided primarily for OSS layer and USB gadget drivers, 3053 * and it allows only the limited set of ioctls (hw_params, sw_params, 3054 * prepare, start, drain, drop, forward). 3055 */ 3056 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3057 unsigned int cmd, void *arg) 3058 { 3059 snd_pcm_uframes_t *frames = arg; 3060 snd_pcm_sframes_t result; 3061 3062 switch (cmd) { 3063 case SNDRV_PCM_IOCTL_FORWARD: 3064 { 3065 /* provided only for OSS; capture-only and no value returned */ 3066 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3067 return -EINVAL; 3068 result = snd_pcm_capture_forward(substream, *frames); 3069 return result < 0 ? result : 0; 3070 } 3071 case SNDRV_PCM_IOCTL_HW_PARAMS: 3072 return snd_pcm_hw_params(substream, arg); 3073 case SNDRV_PCM_IOCTL_SW_PARAMS: 3074 return snd_pcm_sw_params(substream, arg); 3075 case SNDRV_PCM_IOCTL_PREPARE: 3076 return snd_pcm_prepare(substream, NULL); 3077 case SNDRV_PCM_IOCTL_START: 3078 return snd_pcm_start_lock_irq(substream); 3079 case SNDRV_PCM_IOCTL_DRAIN: 3080 return snd_pcm_drain(substream, NULL); 3081 case SNDRV_PCM_IOCTL_DROP: 3082 return snd_pcm_drop(substream); 3083 case SNDRV_PCM_IOCTL_DELAY: 3084 { 3085 result = snd_pcm_delay(substream); 3086 if (result < 0) 3087 return result; 3088 *frames = result; 3089 return 0; 3090 } 3091 default: 3092 return -EINVAL; 3093 } 3094 } 3095 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3096 3097 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3098 loff_t * offset) 3099 { 3100 struct snd_pcm_file *pcm_file; 3101 struct snd_pcm_substream *substream; 3102 struct snd_pcm_runtime *runtime; 3103 snd_pcm_sframes_t result; 3104 3105 pcm_file = file->private_data; 3106 substream = pcm_file->substream; 3107 if (PCM_RUNTIME_CHECK(substream)) 3108 return -ENXIO; 3109 runtime = substream->runtime; 3110 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3111 return -EBADFD; 3112 if (!frame_aligned(runtime, count)) 3113 return -EINVAL; 3114 count = bytes_to_frames(runtime, count); 3115 result = snd_pcm_lib_read(substream, buf, count); 3116 if (result > 0) 3117 result = frames_to_bytes(runtime, result); 3118 return result; 3119 } 3120 3121 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3122 size_t count, loff_t * offset) 3123 { 3124 struct snd_pcm_file *pcm_file; 3125 struct snd_pcm_substream *substream; 3126 struct snd_pcm_runtime *runtime; 3127 snd_pcm_sframes_t result; 3128 3129 pcm_file = file->private_data; 3130 substream = pcm_file->substream; 3131 if (PCM_RUNTIME_CHECK(substream)) 3132 return -ENXIO; 3133 runtime = substream->runtime; 3134 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3135 return -EBADFD; 3136 if (!frame_aligned(runtime, count)) 3137 return -EINVAL; 3138 count = bytes_to_frames(runtime, count); 3139 result = snd_pcm_lib_write(substream, buf, count); 3140 if (result > 0) 3141 result = frames_to_bytes(runtime, result); 3142 return result; 3143 } 3144 3145 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3146 { 3147 struct snd_pcm_file *pcm_file; 3148 struct snd_pcm_substream *substream; 3149 struct snd_pcm_runtime *runtime; 3150 snd_pcm_sframes_t result; 3151 unsigned long i; 3152 void __user **bufs; 3153 snd_pcm_uframes_t frames; 3154 3155 pcm_file = iocb->ki_filp->private_data; 3156 substream = pcm_file->substream; 3157 if (PCM_RUNTIME_CHECK(substream)) 3158 return -ENXIO; 3159 runtime = substream->runtime; 3160 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3161 return -EBADFD; 3162 if (!iter_is_iovec(to)) 3163 return -EINVAL; 3164 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3165 return -EINVAL; 3166 if (!frame_aligned(runtime, to->iov->iov_len)) 3167 return -EINVAL; 3168 frames = bytes_to_samples(runtime, to->iov->iov_len); 3169 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3170 if (bufs == NULL) 3171 return -ENOMEM; 3172 for (i = 0; i < to->nr_segs; ++i) 3173 bufs[i] = to->iov[i].iov_base; 3174 result = snd_pcm_lib_readv(substream, bufs, frames); 3175 if (result > 0) 3176 result = frames_to_bytes(runtime, result); 3177 kfree(bufs); 3178 return result; 3179 } 3180 3181 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3182 { 3183 struct snd_pcm_file *pcm_file; 3184 struct snd_pcm_substream *substream; 3185 struct snd_pcm_runtime *runtime; 3186 snd_pcm_sframes_t result; 3187 unsigned long i; 3188 void __user **bufs; 3189 snd_pcm_uframes_t frames; 3190 3191 pcm_file = iocb->ki_filp->private_data; 3192 substream = pcm_file->substream; 3193 if (PCM_RUNTIME_CHECK(substream)) 3194 return -ENXIO; 3195 runtime = substream->runtime; 3196 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3197 return -EBADFD; 3198 if (!iter_is_iovec(from)) 3199 return -EINVAL; 3200 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3201 !frame_aligned(runtime, from->iov->iov_len)) 3202 return -EINVAL; 3203 frames = bytes_to_samples(runtime, from->iov->iov_len); 3204 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3205 if (bufs == NULL) 3206 return -ENOMEM; 3207 for (i = 0; i < from->nr_segs; ++i) 3208 bufs[i] = from->iov[i].iov_base; 3209 result = snd_pcm_lib_writev(substream, bufs, frames); 3210 if (result > 0) 3211 result = frames_to_bytes(runtime, result); 3212 kfree(bufs); 3213 return result; 3214 } 3215 3216 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3217 { 3218 struct snd_pcm_file *pcm_file; 3219 struct snd_pcm_substream *substream; 3220 struct snd_pcm_runtime *runtime; 3221 unsigned int mask; 3222 snd_pcm_uframes_t avail; 3223 3224 pcm_file = file->private_data; 3225 3226 substream = pcm_file->substream; 3227 if (PCM_RUNTIME_CHECK(substream)) 3228 return POLLOUT | POLLWRNORM | POLLERR; 3229 runtime = substream->runtime; 3230 3231 poll_wait(file, &runtime->sleep, wait); 3232 3233 snd_pcm_stream_lock_irq(substream); 3234 avail = snd_pcm_playback_avail(runtime); 3235 switch (runtime->status->state) { 3236 case SNDRV_PCM_STATE_RUNNING: 3237 case SNDRV_PCM_STATE_PREPARED: 3238 case SNDRV_PCM_STATE_PAUSED: 3239 if (avail >= runtime->control->avail_min) { 3240 mask = POLLOUT | POLLWRNORM; 3241 break; 3242 } 3243 /* Fall through */ 3244 case SNDRV_PCM_STATE_DRAINING: 3245 mask = 0; 3246 break; 3247 default: 3248 mask = POLLOUT | POLLWRNORM | POLLERR; 3249 break; 3250 } 3251 snd_pcm_stream_unlock_irq(substream); 3252 return mask; 3253 } 3254 3255 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3256 { 3257 struct snd_pcm_file *pcm_file; 3258 struct snd_pcm_substream *substream; 3259 struct snd_pcm_runtime *runtime; 3260 unsigned int mask; 3261 snd_pcm_uframes_t avail; 3262 3263 pcm_file = file->private_data; 3264 3265 substream = pcm_file->substream; 3266 if (PCM_RUNTIME_CHECK(substream)) 3267 return POLLIN | POLLRDNORM | POLLERR; 3268 runtime = substream->runtime; 3269 3270 poll_wait(file, &runtime->sleep, wait); 3271 3272 snd_pcm_stream_lock_irq(substream); 3273 avail = snd_pcm_capture_avail(runtime); 3274 switch (runtime->status->state) { 3275 case SNDRV_PCM_STATE_RUNNING: 3276 case SNDRV_PCM_STATE_PREPARED: 3277 case SNDRV_PCM_STATE_PAUSED: 3278 if (avail >= runtime->control->avail_min) { 3279 mask = POLLIN | POLLRDNORM; 3280 break; 3281 } 3282 mask = 0; 3283 break; 3284 case SNDRV_PCM_STATE_DRAINING: 3285 if (avail > 0) { 3286 mask = POLLIN | POLLRDNORM; 3287 break; 3288 } 3289 /* Fall through */ 3290 default: 3291 mask = POLLIN | POLLRDNORM | POLLERR; 3292 break; 3293 } 3294 snd_pcm_stream_unlock_irq(substream); 3295 return mask; 3296 } 3297 3298 /* 3299 * mmap support 3300 */ 3301 3302 /* 3303 * Only on coherent architectures, we can mmap the status and the control records 3304 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3305 */ 3306 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3307 /* 3308 * mmap status record 3309 */ 3310 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3311 { 3312 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3313 struct snd_pcm_runtime *runtime; 3314 3315 if (substream == NULL) 3316 return VM_FAULT_SIGBUS; 3317 runtime = substream->runtime; 3318 vmf->page = virt_to_page(runtime->status); 3319 get_page(vmf->page); 3320 return 0; 3321 } 3322 3323 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3324 { 3325 .fault = snd_pcm_mmap_status_fault, 3326 }; 3327 3328 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3329 struct vm_area_struct *area) 3330 { 3331 long size; 3332 if (!(area->vm_flags & VM_READ)) 3333 return -EINVAL; 3334 size = area->vm_end - area->vm_start; 3335 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3336 return -EINVAL; 3337 area->vm_ops = &snd_pcm_vm_ops_status; 3338 area->vm_private_data = substream; 3339 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3340 return 0; 3341 } 3342 3343 /* 3344 * mmap control record 3345 */ 3346 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3347 { 3348 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3349 struct snd_pcm_runtime *runtime; 3350 3351 if (substream == NULL) 3352 return VM_FAULT_SIGBUS; 3353 runtime = substream->runtime; 3354 vmf->page = virt_to_page(runtime->control); 3355 get_page(vmf->page); 3356 return 0; 3357 } 3358 3359 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3360 { 3361 .fault = snd_pcm_mmap_control_fault, 3362 }; 3363 3364 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3365 struct vm_area_struct *area) 3366 { 3367 long size; 3368 if (!(area->vm_flags & VM_READ)) 3369 return -EINVAL; 3370 size = area->vm_end - area->vm_start; 3371 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3372 return -EINVAL; 3373 area->vm_ops = &snd_pcm_vm_ops_control; 3374 area->vm_private_data = substream; 3375 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3376 return 0; 3377 } 3378 #else /* ! coherent mmap */ 3379 /* 3380 * don't support mmap for status and control records. 3381 */ 3382 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3383 struct vm_area_struct *area) 3384 { 3385 return -ENXIO; 3386 } 3387 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3388 struct vm_area_struct *area) 3389 { 3390 return -ENXIO; 3391 } 3392 #endif /* coherent mmap */ 3393 3394 static inline struct page * 3395 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3396 { 3397 void *vaddr = substream->runtime->dma_area + ofs; 3398 return virt_to_page(vaddr); 3399 } 3400 3401 /* 3402 * fault callback for mmapping a RAM page 3403 */ 3404 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3405 { 3406 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3407 struct snd_pcm_runtime *runtime; 3408 unsigned long offset; 3409 struct page * page; 3410 size_t dma_bytes; 3411 3412 if (substream == NULL) 3413 return VM_FAULT_SIGBUS; 3414 runtime = substream->runtime; 3415 offset = vmf->pgoff << PAGE_SHIFT; 3416 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3417 if (offset > dma_bytes - PAGE_SIZE) 3418 return VM_FAULT_SIGBUS; 3419 if (substream->ops->page) 3420 page = substream->ops->page(substream, offset); 3421 else 3422 page = snd_pcm_default_page_ops(substream, offset); 3423 if (!page) 3424 return VM_FAULT_SIGBUS; 3425 get_page(page); 3426 vmf->page = page; 3427 return 0; 3428 } 3429 3430 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3431 .open = snd_pcm_mmap_data_open, 3432 .close = snd_pcm_mmap_data_close, 3433 }; 3434 3435 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3436 .open = snd_pcm_mmap_data_open, 3437 .close = snd_pcm_mmap_data_close, 3438 .fault = snd_pcm_mmap_data_fault, 3439 }; 3440 3441 /* 3442 * mmap the DMA buffer on RAM 3443 */ 3444 3445 /** 3446 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3447 * @substream: PCM substream 3448 * @area: VMA 3449 * 3450 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3451 * this function is invoked implicitly. 3452 */ 3453 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3454 struct vm_area_struct *area) 3455 { 3456 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3457 #ifdef CONFIG_GENERIC_ALLOCATOR 3458 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3459 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3460 return remap_pfn_range(area, area->vm_start, 3461 substream->dma_buffer.addr >> PAGE_SHIFT, 3462 area->vm_end - area->vm_start, area->vm_page_prot); 3463 } 3464 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3465 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3466 if (!substream->ops->page && 3467 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3468 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3469 area, 3470 substream->runtime->dma_area, 3471 substream->runtime->dma_addr, 3472 area->vm_end - area->vm_start); 3473 #endif /* CONFIG_X86 */ 3474 /* mmap with fault handler */ 3475 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3476 return 0; 3477 } 3478 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3479 3480 /* 3481 * mmap the DMA buffer on I/O memory area 3482 */ 3483 #if SNDRV_PCM_INFO_MMAP_IOMEM 3484 /** 3485 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3486 * @substream: PCM substream 3487 * @area: VMA 3488 * 3489 * When your hardware uses the iomapped pages as the hardware buffer and 3490 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3491 * is supposed to work only on limited architectures. 3492 */ 3493 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3494 struct vm_area_struct *area) 3495 { 3496 struct snd_pcm_runtime *runtime = substream->runtime;; 3497 3498 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3499 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3500 } 3501 3502 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3503 #endif /* SNDRV_PCM_INFO_MMAP */ 3504 3505 /* 3506 * mmap DMA buffer 3507 */ 3508 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3509 struct vm_area_struct *area) 3510 { 3511 struct snd_pcm_runtime *runtime; 3512 long size; 3513 unsigned long offset; 3514 size_t dma_bytes; 3515 int err; 3516 3517 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3518 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3519 return -EINVAL; 3520 } else { 3521 if (!(area->vm_flags & VM_READ)) 3522 return -EINVAL; 3523 } 3524 runtime = substream->runtime; 3525 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3526 return -EBADFD; 3527 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3528 return -ENXIO; 3529 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3530 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3531 return -EINVAL; 3532 size = area->vm_end - area->vm_start; 3533 offset = area->vm_pgoff << PAGE_SHIFT; 3534 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3535 if ((size_t)size > dma_bytes) 3536 return -EINVAL; 3537 if (offset > dma_bytes - size) 3538 return -EINVAL; 3539 3540 area->vm_ops = &snd_pcm_vm_ops_data; 3541 area->vm_private_data = substream; 3542 if (substream->ops->mmap) 3543 err = substream->ops->mmap(substream, area); 3544 else 3545 err = snd_pcm_lib_default_mmap(substream, area); 3546 if (!err) 3547 atomic_inc(&substream->mmap_count); 3548 return err; 3549 } 3550 3551 EXPORT_SYMBOL(snd_pcm_mmap_data); 3552 3553 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3554 { 3555 struct snd_pcm_file * pcm_file; 3556 struct snd_pcm_substream *substream; 3557 unsigned long offset; 3558 3559 pcm_file = file->private_data; 3560 substream = pcm_file->substream; 3561 if (PCM_RUNTIME_CHECK(substream)) 3562 return -ENXIO; 3563 3564 offset = area->vm_pgoff << PAGE_SHIFT; 3565 switch (offset) { 3566 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3567 if (pcm_file->no_compat_mmap) 3568 return -ENXIO; 3569 return snd_pcm_mmap_status(substream, file, area); 3570 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3571 if (pcm_file->no_compat_mmap) 3572 return -ENXIO; 3573 return snd_pcm_mmap_control(substream, file, area); 3574 default: 3575 return snd_pcm_mmap_data(substream, file, area); 3576 } 3577 return 0; 3578 } 3579 3580 static int snd_pcm_fasync(int fd, struct file * file, int on) 3581 { 3582 struct snd_pcm_file * pcm_file; 3583 struct snd_pcm_substream *substream; 3584 struct snd_pcm_runtime *runtime; 3585 3586 pcm_file = file->private_data; 3587 substream = pcm_file->substream; 3588 if (PCM_RUNTIME_CHECK(substream)) 3589 return -ENXIO; 3590 runtime = substream->runtime; 3591 return fasync_helper(fd, file, on, &runtime->fasync); 3592 } 3593 3594 /* 3595 * ioctl32 compat 3596 */ 3597 #ifdef CONFIG_COMPAT 3598 #include "pcm_compat.c" 3599 #else 3600 #define snd_pcm_ioctl_compat NULL 3601 #endif 3602 3603 /* 3604 * To be removed helpers to keep binary compatibility 3605 */ 3606 3607 #ifdef CONFIG_SND_SUPPORT_OLD_API 3608 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3609 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3610 3611 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3612 struct snd_pcm_hw_params_old *oparams) 3613 { 3614 unsigned int i; 3615 3616 memset(params, 0, sizeof(*params)); 3617 params->flags = oparams->flags; 3618 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3619 params->masks[i].bits[0] = oparams->masks[i]; 3620 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3621 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3622 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3623 params->info = oparams->info; 3624 params->msbits = oparams->msbits; 3625 params->rate_num = oparams->rate_num; 3626 params->rate_den = oparams->rate_den; 3627 params->fifo_size = oparams->fifo_size; 3628 } 3629 3630 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3631 struct snd_pcm_hw_params *params) 3632 { 3633 unsigned int i; 3634 3635 memset(oparams, 0, sizeof(*oparams)); 3636 oparams->flags = params->flags; 3637 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3638 oparams->masks[i] = params->masks[i].bits[0]; 3639 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3640 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3641 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3642 oparams->info = params->info; 3643 oparams->msbits = params->msbits; 3644 oparams->rate_num = params->rate_num; 3645 oparams->rate_den = params->rate_den; 3646 oparams->fifo_size = params->fifo_size; 3647 } 3648 3649 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3650 struct snd_pcm_hw_params_old __user * _oparams) 3651 { 3652 struct snd_pcm_hw_params *params; 3653 struct snd_pcm_hw_params_old *oparams = NULL; 3654 int err; 3655 3656 params = kmalloc(sizeof(*params), GFP_KERNEL); 3657 if (!params) 3658 return -ENOMEM; 3659 3660 oparams = memdup_user(_oparams, sizeof(*oparams)); 3661 if (IS_ERR(oparams)) { 3662 err = PTR_ERR(oparams); 3663 goto out; 3664 } 3665 snd_pcm_hw_convert_from_old_params(params, oparams); 3666 err = snd_pcm_hw_refine(substream, params); 3667 if (err < 0) 3668 goto out_old; 3669 3670 err = fixup_unreferenced_params(substream, params); 3671 if (err < 0) 3672 goto out_old; 3673 3674 snd_pcm_hw_convert_to_old_params(oparams, params); 3675 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3676 err = -EFAULT; 3677 out_old: 3678 kfree(oparams); 3679 out: 3680 kfree(params); 3681 return err; 3682 } 3683 3684 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3685 struct snd_pcm_hw_params_old __user * _oparams) 3686 { 3687 struct snd_pcm_hw_params *params; 3688 struct snd_pcm_hw_params_old *oparams = NULL; 3689 int err; 3690 3691 params = kmalloc(sizeof(*params), GFP_KERNEL); 3692 if (!params) 3693 return -ENOMEM; 3694 3695 oparams = memdup_user(_oparams, sizeof(*oparams)); 3696 if (IS_ERR(oparams)) { 3697 err = PTR_ERR(oparams); 3698 goto out; 3699 } 3700 3701 snd_pcm_hw_convert_from_old_params(params, oparams); 3702 err = snd_pcm_hw_params(substream, params); 3703 if (err < 0) 3704 goto out_old; 3705 3706 snd_pcm_hw_convert_to_old_params(oparams, params); 3707 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3708 err = -EFAULT; 3709 out_old: 3710 kfree(oparams); 3711 out: 3712 kfree(params); 3713 return err; 3714 } 3715 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3716 3717 #ifndef CONFIG_MMU 3718 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3719 unsigned long addr, 3720 unsigned long len, 3721 unsigned long pgoff, 3722 unsigned long flags) 3723 { 3724 struct snd_pcm_file *pcm_file = file->private_data; 3725 struct snd_pcm_substream *substream = pcm_file->substream; 3726 struct snd_pcm_runtime *runtime = substream->runtime; 3727 unsigned long offset = pgoff << PAGE_SHIFT; 3728 3729 switch (offset) { 3730 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3731 return (unsigned long)runtime->status; 3732 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3733 return (unsigned long)runtime->control; 3734 default: 3735 return (unsigned long)runtime->dma_area + offset; 3736 } 3737 } 3738 #else 3739 # define snd_pcm_get_unmapped_area NULL 3740 #endif 3741 3742 /* 3743 * Register section 3744 */ 3745 3746 const struct file_operations snd_pcm_f_ops[2] = { 3747 { 3748 .owner = THIS_MODULE, 3749 .write = snd_pcm_write, 3750 .write_iter = snd_pcm_writev, 3751 .open = snd_pcm_playback_open, 3752 .release = snd_pcm_release, 3753 .llseek = no_llseek, 3754 .poll = snd_pcm_playback_poll, 3755 .unlocked_ioctl = snd_pcm_playback_ioctl, 3756 .compat_ioctl = snd_pcm_ioctl_compat, 3757 .mmap = snd_pcm_mmap, 3758 .fasync = snd_pcm_fasync, 3759 .get_unmapped_area = snd_pcm_get_unmapped_area, 3760 }, 3761 { 3762 .owner = THIS_MODULE, 3763 .read = snd_pcm_read, 3764 .read_iter = snd_pcm_readv, 3765 .open = snd_pcm_capture_open, 3766 .release = snd_pcm_release, 3767 .llseek = no_llseek, 3768 .poll = snd_pcm_capture_poll, 3769 .unlocked_ioctl = snd_pcm_capture_ioctl, 3770 .compat_ioctl = snd_pcm_ioctl_compat, 3771 .mmap = snd_pcm_mmap, 3772 .fasync = snd_pcm_fasync, 3773 .get_unmapped_area = snd_pcm_get_unmapped_area, 3774 } 3775 }; 3776