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; 281 282 trace_hw_mask_param(substream, k, 0, &old_mask, m); 283 284 /* Set corresponding flag so that the caller gets it. */ 285 if (changed) 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; 317 318 trace_hw_interval_param(substream, k, 0, &old_interval, i); 319 320 /* Set corresponding flag so that the caller gets it. */ 321 if (changed) 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 if (hw_is_mask(r->var)) { 413 trace_hw_mask_param(substream, r->var, k + 1, 414 &old_mask, hw_param_mask(params, r->var)); 415 } 416 if (hw_is_interval(r->var)) { 417 trace_hw_interval_param(substream, r->var, k + 1, 418 &old_interval, hw_param_interval(params, r->var)); 419 } 420 421 rstamps[k] = stamp; 422 423 /* 424 * When the parameters is changed, notify it to the caller 425 * by corresponding returned bit, then preparing for next 426 * iteration. 427 */ 428 if (changed && r->var >= 0) { 429 params->cmask |= (1 << r->var); 430 vstamps[r->var] = stamp; 431 again = true; 432 } 433 434 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 err; 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 err = snd_pcm_hw_param_first(pcm, params, *v, NULL); 621 else 622 err = snd_pcm_hw_param_last(pcm, params, *v, NULL); 623 if (snd_BUG_ON(err < 0)) 624 return err; 625 626 /* Trace the parameter. */ 627 if (hw_is_mask(*v)) { 628 trace_hw_mask_param(pcm, *v, 0, &old_mask, 629 hw_param_mask(params, *v)); 630 } 631 if (hw_is_interval(*v)) { 632 trace_hw_interval_param(pcm, *v, 0, &old_interval, 633 hw_param_interval(params, *v)); 634 } 635 } 636 637 return 0; 638 } 639 640 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 641 struct snd_pcm_hw_params *params) 642 { 643 struct snd_pcm_runtime *runtime; 644 int err, usecs; 645 unsigned int bits; 646 snd_pcm_uframes_t frames; 647 648 if (PCM_RUNTIME_CHECK(substream)) 649 return -ENXIO; 650 runtime = substream->runtime; 651 snd_pcm_stream_lock_irq(substream); 652 switch (runtime->status->state) { 653 case SNDRV_PCM_STATE_OPEN: 654 case SNDRV_PCM_STATE_SETUP: 655 case SNDRV_PCM_STATE_PREPARED: 656 break; 657 default: 658 snd_pcm_stream_unlock_irq(substream); 659 return -EBADFD; 660 } 661 snd_pcm_stream_unlock_irq(substream); 662 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 663 if (!substream->oss.oss) 664 #endif 665 if (atomic_read(&substream->mmap_count)) 666 return -EBADFD; 667 668 params->rmask = ~0U; 669 err = snd_pcm_hw_refine(substream, params); 670 if (err < 0) 671 goto _error; 672 673 err = snd_pcm_hw_params_choose(substream, params); 674 if (err < 0) 675 goto _error; 676 677 err = fixup_unreferenced_params(substream, params); 678 if (err < 0) 679 goto _error; 680 681 if (substream->ops->hw_params != NULL) { 682 err = substream->ops->hw_params(substream, params); 683 if (err < 0) 684 goto _error; 685 } 686 687 runtime->access = params_access(params); 688 runtime->format = params_format(params); 689 runtime->subformat = params_subformat(params); 690 runtime->channels = params_channels(params); 691 runtime->rate = params_rate(params); 692 runtime->period_size = params_period_size(params); 693 runtime->periods = params_periods(params); 694 runtime->buffer_size = params_buffer_size(params); 695 runtime->info = params->info; 696 runtime->rate_num = params->rate_num; 697 runtime->rate_den = params->rate_den; 698 runtime->no_period_wakeup = 699 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 700 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 701 702 bits = snd_pcm_format_physical_width(runtime->format); 703 runtime->sample_bits = bits; 704 bits *= runtime->channels; 705 runtime->frame_bits = bits; 706 frames = 1; 707 while (bits % 8 != 0) { 708 bits *= 2; 709 frames *= 2; 710 } 711 runtime->byte_align = bits / 8; 712 runtime->min_align = frames; 713 714 /* Default sw params */ 715 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 716 runtime->period_step = 1; 717 runtime->control->avail_min = runtime->period_size; 718 runtime->start_threshold = 1; 719 runtime->stop_threshold = runtime->buffer_size; 720 runtime->silence_threshold = 0; 721 runtime->silence_size = 0; 722 runtime->boundary = runtime->buffer_size; 723 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 724 runtime->boundary *= 2; 725 726 snd_pcm_timer_resolution_change(substream); 727 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 728 729 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 730 pm_qos_remove_request(&substream->latency_pm_qos_req); 731 if ((usecs = period_to_usecs(runtime)) >= 0) 732 pm_qos_add_request(&substream->latency_pm_qos_req, 733 PM_QOS_CPU_DMA_LATENCY, usecs); 734 return 0; 735 _error: 736 /* hardware might be unusable from this time, 737 so we force application to retry to set 738 the correct hardware parameter settings */ 739 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 740 if (substream->ops->hw_free != NULL) 741 substream->ops->hw_free(substream); 742 return err; 743 } 744 745 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 746 struct snd_pcm_hw_params __user * _params) 747 { 748 struct snd_pcm_hw_params *params; 749 int err; 750 751 params = memdup_user(_params, sizeof(*params)); 752 if (IS_ERR(params)) 753 return PTR_ERR(params); 754 755 err = snd_pcm_hw_params(substream, params); 756 if (err < 0) 757 goto end; 758 759 if (copy_to_user(_params, params, sizeof(*params))) 760 err = -EFAULT; 761 end: 762 kfree(params); 763 return err; 764 } 765 766 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 767 { 768 struct snd_pcm_runtime *runtime; 769 int result = 0; 770 771 if (PCM_RUNTIME_CHECK(substream)) 772 return -ENXIO; 773 runtime = substream->runtime; 774 snd_pcm_stream_lock_irq(substream); 775 switch (runtime->status->state) { 776 case SNDRV_PCM_STATE_SETUP: 777 case SNDRV_PCM_STATE_PREPARED: 778 break; 779 default: 780 snd_pcm_stream_unlock_irq(substream); 781 return -EBADFD; 782 } 783 snd_pcm_stream_unlock_irq(substream); 784 if (atomic_read(&substream->mmap_count)) 785 return -EBADFD; 786 if (substream->ops->hw_free) 787 result = substream->ops->hw_free(substream); 788 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 789 pm_qos_remove_request(&substream->latency_pm_qos_req); 790 return result; 791 } 792 793 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 794 struct snd_pcm_sw_params *params) 795 { 796 struct snd_pcm_runtime *runtime; 797 int err; 798 799 if (PCM_RUNTIME_CHECK(substream)) 800 return -ENXIO; 801 runtime = substream->runtime; 802 snd_pcm_stream_lock_irq(substream); 803 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 804 snd_pcm_stream_unlock_irq(substream); 805 return -EBADFD; 806 } 807 snd_pcm_stream_unlock_irq(substream); 808 809 if (params->tstamp_mode < 0 || 810 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 811 return -EINVAL; 812 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 813 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 814 return -EINVAL; 815 if (params->avail_min == 0) 816 return -EINVAL; 817 if (params->silence_size >= runtime->boundary) { 818 if (params->silence_threshold != 0) 819 return -EINVAL; 820 } else { 821 if (params->silence_size > params->silence_threshold) 822 return -EINVAL; 823 if (params->silence_threshold > runtime->buffer_size) 824 return -EINVAL; 825 } 826 err = 0; 827 snd_pcm_stream_lock_irq(substream); 828 runtime->tstamp_mode = params->tstamp_mode; 829 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 830 runtime->tstamp_type = params->tstamp_type; 831 runtime->period_step = params->period_step; 832 runtime->control->avail_min = params->avail_min; 833 runtime->start_threshold = params->start_threshold; 834 runtime->stop_threshold = params->stop_threshold; 835 runtime->silence_threshold = params->silence_threshold; 836 runtime->silence_size = params->silence_size; 837 params->boundary = runtime->boundary; 838 if (snd_pcm_running(substream)) { 839 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 840 runtime->silence_size > 0) 841 snd_pcm_playback_silence(substream, ULONG_MAX); 842 err = snd_pcm_update_state(substream, runtime); 843 } 844 snd_pcm_stream_unlock_irq(substream); 845 return err; 846 } 847 848 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 849 struct snd_pcm_sw_params __user * _params) 850 { 851 struct snd_pcm_sw_params params; 852 int err; 853 if (copy_from_user(¶ms, _params, sizeof(params))) 854 return -EFAULT; 855 err = snd_pcm_sw_params(substream, ¶ms); 856 if (copy_to_user(_params, ¶ms, sizeof(params))) 857 return -EFAULT; 858 return err; 859 } 860 861 int snd_pcm_status(struct snd_pcm_substream *substream, 862 struct snd_pcm_status *status) 863 { 864 struct snd_pcm_runtime *runtime = substream->runtime; 865 866 snd_pcm_stream_lock_irq(substream); 867 868 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 869 &runtime->audio_tstamp_config); 870 871 /* backwards compatible behavior */ 872 if (runtime->audio_tstamp_config.type_requested == 873 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 874 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 875 runtime->audio_tstamp_config.type_requested = 876 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 877 else 878 runtime->audio_tstamp_config.type_requested = 879 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 880 runtime->audio_tstamp_report.valid = 0; 881 } else 882 runtime->audio_tstamp_report.valid = 1; 883 884 status->state = runtime->status->state; 885 status->suspended_state = runtime->status->suspended_state; 886 if (status->state == SNDRV_PCM_STATE_OPEN) 887 goto _end; 888 status->trigger_tstamp = runtime->trigger_tstamp; 889 if (snd_pcm_running(substream)) { 890 snd_pcm_update_hw_ptr(substream); 891 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 892 status->tstamp = runtime->status->tstamp; 893 status->driver_tstamp = runtime->driver_tstamp; 894 status->audio_tstamp = 895 runtime->status->audio_tstamp; 896 if (runtime->audio_tstamp_report.valid == 1) 897 /* backwards compatibility, no report provided in COMPAT mode */ 898 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 899 &status->audio_tstamp_accuracy, 900 &runtime->audio_tstamp_report); 901 902 goto _tstamp_end; 903 } 904 } else { 905 /* get tstamp only in fallback mode and only if enabled */ 906 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 907 snd_pcm_gettime(runtime, &status->tstamp); 908 } 909 _tstamp_end: 910 status->appl_ptr = runtime->control->appl_ptr; 911 status->hw_ptr = runtime->status->hw_ptr; 912 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 913 status->avail = snd_pcm_playback_avail(runtime); 914 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 915 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 916 status->delay = runtime->buffer_size - status->avail; 917 status->delay += runtime->delay; 918 } else 919 status->delay = 0; 920 } else { 921 status->avail = snd_pcm_capture_avail(runtime); 922 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 923 status->delay = status->avail + runtime->delay; 924 else 925 status->delay = 0; 926 } 927 status->avail_max = runtime->avail_max; 928 status->overrange = runtime->overrange; 929 runtime->avail_max = 0; 930 runtime->overrange = 0; 931 _end: 932 snd_pcm_stream_unlock_irq(substream); 933 return 0; 934 } 935 936 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 937 struct snd_pcm_status __user * _status, 938 bool ext) 939 { 940 struct snd_pcm_status status; 941 int res; 942 943 memset(&status, 0, sizeof(status)); 944 /* 945 * with extension, parameters are read/write, 946 * get audio_tstamp_data from user, 947 * ignore rest of status structure 948 */ 949 if (ext && get_user(status.audio_tstamp_data, 950 (u32 __user *)(&_status->audio_tstamp_data))) 951 return -EFAULT; 952 res = snd_pcm_status(substream, &status); 953 if (res < 0) 954 return res; 955 if (copy_to_user(_status, &status, sizeof(status))) 956 return -EFAULT; 957 return 0; 958 } 959 960 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 961 struct snd_pcm_channel_info * info) 962 { 963 struct snd_pcm_runtime *runtime; 964 unsigned int channel; 965 966 channel = info->channel; 967 runtime = substream->runtime; 968 snd_pcm_stream_lock_irq(substream); 969 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 970 snd_pcm_stream_unlock_irq(substream); 971 return -EBADFD; 972 } 973 snd_pcm_stream_unlock_irq(substream); 974 if (channel >= runtime->channels) 975 return -EINVAL; 976 memset(info, 0, sizeof(*info)); 977 info->channel = channel; 978 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 979 } 980 981 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 982 struct snd_pcm_channel_info __user * _info) 983 { 984 struct snd_pcm_channel_info info; 985 int res; 986 987 if (copy_from_user(&info, _info, sizeof(info))) 988 return -EFAULT; 989 res = snd_pcm_channel_info(substream, &info); 990 if (res < 0) 991 return res; 992 if (copy_to_user(_info, &info, sizeof(info))) 993 return -EFAULT; 994 return 0; 995 } 996 997 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 998 { 999 struct snd_pcm_runtime *runtime = substream->runtime; 1000 if (runtime->trigger_master == NULL) 1001 return; 1002 if (runtime->trigger_master == substream) { 1003 if (!runtime->trigger_tstamp_latched) 1004 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1005 } else { 1006 snd_pcm_trigger_tstamp(runtime->trigger_master); 1007 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1008 } 1009 runtime->trigger_master = NULL; 1010 } 1011 1012 struct action_ops { 1013 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1014 int (*do_action)(struct snd_pcm_substream *substream, int state); 1015 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1016 void (*post_action)(struct snd_pcm_substream *substream, int state); 1017 }; 1018 1019 /* 1020 * this functions is core for handling of linked stream 1021 * Note: the stream state might be changed also on failure 1022 * Note2: call with calling stream lock + link lock 1023 */ 1024 static int snd_pcm_action_group(const struct action_ops *ops, 1025 struct snd_pcm_substream *substream, 1026 int state, int do_lock) 1027 { 1028 struct snd_pcm_substream *s = NULL; 1029 struct snd_pcm_substream *s1; 1030 int res = 0, depth = 1; 1031 1032 snd_pcm_group_for_each_entry(s, substream) { 1033 if (do_lock && s != substream) { 1034 if (s->pcm->nonatomic) 1035 mutex_lock_nested(&s->self_group.mutex, depth); 1036 else 1037 spin_lock_nested(&s->self_group.lock, depth); 1038 depth++; 1039 } 1040 res = ops->pre_action(s, state); 1041 if (res < 0) 1042 goto _unlock; 1043 } 1044 snd_pcm_group_for_each_entry(s, substream) { 1045 res = ops->do_action(s, state); 1046 if (res < 0) { 1047 if (ops->undo_action) { 1048 snd_pcm_group_for_each_entry(s1, substream) { 1049 if (s1 == s) /* failed stream */ 1050 break; 1051 ops->undo_action(s1, state); 1052 } 1053 } 1054 s = NULL; /* unlock all */ 1055 goto _unlock; 1056 } 1057 } 1058 snd_pcm_group_for_each_entry(s, substream) { 1059 ops->post_action(s, state); 1060 } 1061 _unlock: 1062 if (do_lock) { 1063 /* unlock streams */ 1064 snd_pcm_group_for_each_entry(s1, substream) { 1065 if (s1 != substream) { 1066 if (s1->pcm->nonatomic) 1067 mutex_unlock(&s1->self_group.mutex); 1068 else 1069 spin_unlock(&s1->self_group.lock); 1070 } 1071 if (s1 == s) /* end */ 1072 break; 1073 } 1074 } 1075 return res; 1076 } 1077 1078 /* 1079 * Note: call with stream lock 1080 */ 1081 static int snd_pcm_action_single(const struct action_ops *ops, 1082 struct snd_pcm_substream *substream, 1083 int state) 1084 { 1085 int res; 1086 1087 res = ops->pre_action(substream, state); 1088 if (res < 0) 1089 return res; 1090 res = ops->do_action(substream, state); 1091 if (res == 0) 1092 ops->post_action(substream, state); 1093 else if (ops->undo_action) 1094 ops->undo_action(substream, state); 1095 return res; 1096 } 1097 1098 /* 1099 * Note: call with stream lock 1100 */ 1101 static int snd_pcm_action(const struct action_ops *ops, 1102 struct snd_pcm_substream *substream, 1103 int state) 1104 { 1105 int res; 1106 1107 if (!snd_pcm_stream_linked(substream)) 1108 return snd_pcm_action_single(ops, substream, state); 1109 1110 if (substream->pcm->nonatomic) { 1111 if (!mutex_trylock(&substream->group->mutex)) { 1112 mutex_unlock(&substream->self_group.mutex); 1113 mutex_lock(&substream->group->mutex); 1114 mutex_lock(&substream->self_group.mutex); 1115 } 1116 res = snd_pcm_action_group(ops, substream, state, 1); 1117 mutex_unlock(&substream->group->mutex); 1118 } else { 1119 if (!spin_trylock(&substream->group->lock)) { 1120 spin_unlock(&substream->self_group.lock); 1121 spin_lock(&substream->group->lock); 1122 spin_lock(&substream->self_group.lock); 1123 } 1124 res = snd_pcm_action_group(ops, substream, state, 1); 1125 spin_unlock(&substream->group->lock); 1126 } 1127 return res; 1128 } 1129 1130 /* 1131 * Note: don't use any locks before 1132 */ 1133 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1134 struct snd_pcm_substream *substream, 1135 int state) 1136 { 1137 int res; 1138 1139 snd_pcm_stream_lock_irq(substream); 1140 res = snd_pcm_action(ops, substream, state); 1141 snd_pcm_stream_unlock_irq(substream); 1142 return res; 1143 } 1144 1145 /* 1146 */ 1147 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1148 struct snd_pcm_substream *substream, 1149 int state) 1150 { 1151 int res; 1152 1153 down_read(&snd_pcm_link_rwsem); 1154 if (snd_pcm_stream_linked(substream)) 1155 res = snd_pcm_action_group(ops, substream, state, 0); 1156 else 1157 res = snd_pcm_action_single(ops, substream, state); 1158 up_read(&snd_pcm_link_rwsem); 1159 return res; 1160 } 1161 1162 /* 1163 * start callbacks 1164 */ 1165 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1166 { 1167 struct snd_pcm_runtime *runtime = substream->runtime; 1168 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1169 return -EBADFD; 1170 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1171 !snd_pcm_playback_data(substream)) 1172 return -EPIPE; 1173 runtime->trigger_tstamp_latched = false; 1174 runtime->trigger_master = substream; 1175 return 0; 1176 } 1177 1178 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1179 { 1180 if (substream->runtime->trigger_master != substream) 1181 return 0; 1182 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1183 } 1184 1185 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1186 { 1187 if (substream->runtime->trigger_master == substream) 1188 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1189 } 1190 1191 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1192 { 1193 struct snd_pcm_runtime *runtime = substream->runtime; 1194 snd_pcm_trigger_tstamp(substream); 1195 runtime->hw_ptr_jiffies = jiffies; 1196 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1197 runtime->rate; 1198 runtime->status->state = state; 1199 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1200 runtime->silence_size > 0) 1201 snd_pcm_playback_silence(substream, ULONG_MAX); 1202 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1203 } 1204 1205 static const struct action_ops snd_pcm_action_start = { 1206 .pre_action = snd_pcm_pre_start, 1207 .do_action = snd_pcm_do_start, 1208 .undo_action = snd_pcm_undo_start, 1209 .post_action = snd_pcm_post_start 1210 }; 1211 1212 /** 1213 * snd_pcm_start - start all linked streams 1214 * @substream: the PCM substream instance 1215 * 1216 * Return: Zero if successful, or a negative error code. 1217 * The stream lock must be acquired before calling this function. 1218 */ 1219 int snd_pcm_start(struct snd_pcm_substream *substream) 1220 { 1221 return snd_pcm_action(&snd_pcm_action_start, substream, 1222 SNDRV_PCM_STATE_RUNNING); 1223 } 1224 1225 /* take the stream lock and start the streams */ 1226 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1227 { 1228 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1229 SNDRV_PCM_STATE_RUNNING); 1230 } 1231 1232 /* 1233 * stop callbacks 1234 */ 1235 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1236 { 1237 struct snd_pcm_runtime *runtime = substream->runtime; 1238 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1239 return -EBADFD; 1240 runtime->trigger_master = substream; 1241 return 0; 1242 } 1243 1244 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1245 { 1246 if (substream->runtime->trigger_master == substream && 1247 snd_pcm_running(substream)) 1248 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1249 return 0; /* unconditonally stop all substreams */ 1250 } 1251 1252 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1253 { 1254 struct snd_pcm_runtime *runtime = substream->runtime; 1255 if (runtime->status->state != state) { 1256 snd_pcm_trigger_tstamp(substream); 1257 runtime->status->state = state; 1258 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1259 } 1260 wake_up(&runtime->sleep); 1261 wake_up(&runtime->tsleep); 1262 } 1263 1264 static const struct action_ops snd_pcm_action_stop = { 1265 .pre_action = snd_pcm_pre_stop, 1266 .do_action = snd_pcm_do_stop, 1267 .post_action = snd_pcm_post_stop 1268 }; 1269 1270 /** 1271 * snd_pcm_stop - try to stop all running streams in the substream group 1272 * @substream: the PCM substream instance 1273 * @state: PCM state after stopping the stream 1274 * 1275 * The state of each stream is then changed to the given state unconditionally. 1276 * 1277 * Return: Zero if successful, or a negative error code. 1278 */ 1279 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1280 { 1281 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1282 } 1283 1284 EXPORT_SYMBOL(snd_pcm_stop); 1285 1286 /** 1287 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1288 * @substream: the PCM substream 1289 * 1290 * After stopping, the state is changed to SETUP. 1291 * Unlike snd_pcm_stop(), this affects only the given stream. 1292 * 1293 * Return: Zero if succesful, or a negative error code. 1294 */ 1295 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1296 { 1297 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1298 SNDRV_PCM_STATE_SETUP); 1299 } 1300 1301 /** 1302 * snd_pcm_stop_xrun - stop the running streams as XRUN 1303 * @substream: the PCM substream instance 1304 * 1305 * This stops the given running substream (and all linked substreams) as XRUN. 1306 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1307 * 1308 * Return: Zero if successful, or a negative error code. 1309 */ 1310 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1311 { 1312 unsigned long flags; 1313 int ret = 0; 1314 1315 snd_pcm_stream_lock_irqsave(substream, flags); 1316 if (snd_pcm_running(substream)) 1317 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1318 snd_pcm_stream_unlock_irqrestore(substream, flags); 1319 return ret; 1320 } 1321 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1322 1323 /* 1324 * pause callbacks 1325 */ 1326 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1327 { 1328 struct snd_pcm_runtime *runtime = substream->runtime; 1329 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1330 return -ENOSYS; 1331 if (push) { 1332 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1333 return -EBADFD; 1334 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1335 return -EBADFD; 1336 runtime->trigger_master = substream; 1337 return 0; 1338 } 1339 1340 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1341 { 1342 if (substream->runtime->trigger_master != substream) 1343 return 0; 1344 /* some drivers might use hw_ptr to recover from the pause - 1345 update the hw_ptr now */ 1346 if (push) 1347 snd_pcm_update_hw_ptr(substream); 1348 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1349 * a delta between the current jiffies, this gives a large enough 1350 * delta, effectively to skip the check once. 1351 */ 1352 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1353 return substream->ops->trigger(substream, 1354 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1355 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1356 } 1357 1358 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1359 { 1360 if (substream->runtime->trigger_master == substream) 1361 substream->ops->trigger(substream, 1362 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1363 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1364 } 1365 1366 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1367 { 1368 struct snd_pcm_runtime *runtime = substream->runtime; 1369 snd_pcm_trigger_tstamp(substream); 1370 if (push) { 1371 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1372 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1373 wake_up(&runtime->sleep); 1374 wake_up(&runtime->tsleep); 1375 } else { 1376 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1377 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1378 } 1379 } 1380 1381 static const struct action_ops snd_pcm_action_pause = { 1382 .pre_action = snd_pcm_pre_pause, 1383 .do_action = snd_pcm_do_pause, 1384 .undo_action = snd_pcm_undo_pause, 1385 .post_action = snd_pcm_post_pause 1386 }; 1387 1388 /* 1389 * Push/release the pause for all linked streams. 1390 */ 1391 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1392 { 1393 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1394 } 1395 1396 #ifdef CONFIG_PM 1397 /* suspend */ 1398 1399 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1400 { 1401 struct snd_pcm_runtime *runtime = substream->runtime; 1402 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1403 return -EBUSY; 1404 runtime->trigger_master = substream; 1405 return 0; 1406 } 1407 1408 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1409 { 1410 struct snd_pcm_runtime *runtime = substream->runtime; 1411 if (runtime->trigger_master != substream) 1412 return 0; 1413 if (! snd_pcm_running(substream)) 1414 return 0; 1415 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1416 return 0; /* suspend unconditionally */ 1417 } 1418 1419 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1420 { 1421 struct snd_pcm_runtime *runtime = substream->runtime; 1422 snd_pcm_trigger_tstamp(substream); 1423 runtime->status->suspended_state = runtime->status->state; 1424 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1425 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1426 wake_up(&runtime->sleep); 1427 wake_up(&runtime->tsleep); 1428 } 1429 1430 static const struct action_ops snd_pcm_action_suspend = { 1431 .pre_action = snd_pcm_pre_suspend, 1432 .do_action = snd_pcm_do_suspend, 1433 .post_action = snd_pcm_post_suspend 1434 }; 1435 1436 /** 1437 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1438 * @substream: the PCM substream 1439 * 1440 * After this call, all streams are changed to SUSPENDED state. 1441 * 1442 * Return: Zero if successful (or @substream is %NULL), or a negative error 1443 * code. 1444 */ 1445 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1446 { 1447 int err; 1448 unsigned long flags; 1449 1450 if (! substream) 1451 return 0; 1452 1453 snd_pcm_stream_lock_irqsave(substream, flags); 1454 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1455 snd_pcm_stream_unlock_irqrestore(substream, flags); 1456 return err; 1457 } 1458 1459 EXPORT_SYMBOL(snd_pcm_suspend); 1460 1461 /** 1462 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1463 * @pcm: the PCM instance 1464 * 1465 * After this call, all streams are changed to SUSPENDED state. 1466 * 1467 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1468 */ 1469 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1470 { 1471 struct snd_pcm_substream *substream; 1472 int stream, err = 0; 1473 1474 if (! pcm) 1475 return 0; 1476 1477 for (stream = 0; stream < 2; stream++) { 1478 for (substream = pcm->streams[stream].substream; 1479 substream; substream = substream->next) { 1480 /* FIXME: the open/close code should lock this as well */ 1481 if (substream->runtime == NULL) 1482 continue; 1483 err = snd_pcm_suspend(substream); 1484 if (err < 0 && err != -EBUSY) 1485 return err; 1486 } 1487 } 1488 return 0; 1489 } 1490 1491 EXPORT_SYMBOL(snd_pcm_suspend_all); 1492 1493 /* resume */ 1494 1495 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1496 { 1497 struct snd_pcm_runtime *runtime = substream->runtime; 1498 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1499 return -ENOSYS; 1500 runtime->trigger_master = substream; 1501 return 0; 1502 } 1503 1504 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1505 { 1506 struct snd_pcm_runtime *runtime = substream->runtime; 1507 if (runtime->trigger_master != substream) 1508 return 0; 1509 /* DMA not running previously? */ 1510 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1511 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1512 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1513 return 0; 1514 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1515 } 1516 1517 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1518 { 1519 if (substream->runtime->trigger_master == substream && 1520 snd_pcm_running(substream)) 1521 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1522 } 1523 1524 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1525 { 1526 struct snd_pcm_runtime *runtime = substream->runtime; 1527 snd_pcm_trigger_tstamp(substream); 1528 runtime->status->state = runtime->status->suspended_state; 1529 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1530 } 1531 1532 static const struct action_ops snd_pcm_action_resume = { 1533 .pre_action = snd_pcm_pre_resume, 1534 .do_action = snd_pcm_do_resume, 1535 .undo_action = snd_pcm_undo_resume, 1536 .post_action = snd_pcm_post_resume 1537 }; 1538 1539 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1540 { 1541 struct snd_card *card = substream->pcm->card; 1542 int res; 1543 1544 snd_power_lock(card); 1545 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1546 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1547 snd_power_unlock(card); 1548 return res; 1549 } 1550 1551 #else 1552 1553 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1554 { 1555 return -ENOSYS; 1556 } 1557 1558 #endif /* CONFIG_PM */ 1559 1560 /* 1561 * xrun ioctl 1562 * 1563 * Change the RUNNING stream(s) to XRUN state. 1564 */ 1565 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1566 { 1567 struct snd_card *card = substream->pcm->card; 1568 struct snd_pcm_runtime *runtime = substream->runtime; 1569 int result; 1570 1571 snd_power_lock(card); 1572 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1573 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1574 if (result < 0) 1575 goto _unlock; 1576 } 1577 1578 snd_pcm_stream_lock_irq(substream); 1579 switch (runtime->status->state) { 1580 case SNDRV_PCM_STATE_XRUN: 1581 result = 0; /* already there */ 1582 break; 1583 case SNDRV_PCM_STATE_RUNNING: 1584 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1585 break; 1586 default: 1587 result = -EBADFD; 1588 } 1589 snd_pcm_stream_unlock_irq(substream); 1590 _unlock: 1591 snd_power_unlock(card); 1592 return result; 1593 } 1594 1595 /* 1596 * reset ioctl 1597 */ 1598 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1599 { 1600 struct snd_pcm_runtime *runtime = substream->runtime; 1601 switch (runtime->status->state) { 1602 case SNDRV_PCM_STATE_RUNNING: 1603 case SNDRV_PCM_STATE_PREPARED: 1604 case SNDRV_PCM_STATE_PAUSED: 1605 case SNDRV_PCM_STATE_SUSPENDED: 1606 return 0; 1607 default: 1608 return -EBADFD; 1609 } 1610 } 1611 1612 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1613 { 1614 struct snd_pcm_runtime *runtime = substream->runtime; 1615 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1616 if (err < 0) 1617 return err; 1618 runtime->hw_ptr_base = 0; 1619 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1620 runtime->status->hw_ptr % runtime->period_size; 1621 runtime->silence_start = runtime->status->hw_ptr; 1622 runtime->silence_filled = 0; 1623 return 0; 1624 } 1625 1626 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1627 { 1628 struct snd_pcm_runtime *runtime = substream->runtime; 1629 runtime->control->appl_ptr = runtime->status->hw_ptr; 1630 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1631 runtime->silence_size > 0) 1632 snd_pcm_playback_silence(substream, ULONG_MAX); 1633 } 1634 1635 static const struct action_ops snd_pcm_action_reset = { 1636 .pre_action = snd_pcm_pre_reset, 1637 .do_action = snd_pcm_do_reset, 1638 .post_action = snd_pcm_post_reset 1639 }; 1640 1641 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1642 { 1643 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1644 } 1645 1646 /* 1647 * prepare ioctl 1648 */ 1649 /* we use the second argument for updating f_flags */ 1650 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1651 int f_flags) 1652 { 1653 struct snd_pcm_runtime *runtime = substream->runtime; 1654 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1655 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1656 return -EBADFD; 1657 if (snd_pcm_running(substream)) 1658 return -EBUSY; 1659 substream->f_flags = f_flags; 1660 return 0; 1661 } 1662 1663 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1664 { 1665 int err; 1666 err = substream->ops->prepare(substream); 1667 if (err < 0) 1668 return err; 1669 return snd_pcm_do_reset(substream, 0); 1670 } 1671 1672 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1673 { 1674 struct snd_pcm_runtime *runtime = substream->runtime; 1675 runtime->control->appl_ptr = runtime->status->hw_ptr; 1676 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1677 } 1678 1679 static const struct action_ops snd_pcm_action_prepare = { 1680 .pre_action = snd_pcm_pre_prepare, 1681 .do_action = snd_pcm_do_prepare, 1682 .post_action = snd_pcm_post_prepare 1683 }; 1684 1685 /** 1686 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1687 * @substream: the PCM substream instance 1688 * @file: file to refer f_flags 1689 * 1690 * Return: Zero if successful, or a negative error code. 1691 */ 1692 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1693 struct file *file) 1694 { 1695 int res; 1696 struct snd_card *card = substream->pcm->card; 1697 int f_flags; 1698 1699 if (file) 1700 f_flags = file->f_flags; 1701 else 1702 f_flags = substream->f_flags; 1703 1704 snd_power_lock(card); 1705 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1706 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1707 substream, f_flags); 1708 snd_power_unlock(card); 1709 return res; 1710 } 1711 1712 /* 1713 * drain ioctl 1714 */ 1715 1716 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1717 { 1718 struct snd_pcm_runtime *runtime = substream->runtime; 1719 switch (runtime->status->state) { 1720 case SNDRV_PCM_STATE_OPEN: 1721 case SNDRV_PCM_STATE_DISCONNECTED: 1722 case SNDRV_PCM_STATE_SUSPENDED: 1723 return -EBADFD; 1724 } 1725 runtime->trigger_master = substream; 1726 return 0; 1727 } 1728 1729 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1730 { 1731 struct snd_pcm_runtime *runtime = substream->runtime; 1732 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1733 switch (runtime->status->state) { 1734 case SNDRV_PCM_STATE_PREPARED: 1735 /* start playback stream if possible */ 1736 if (! snd_pcm_playback_empty(substream)) { 1737 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1738 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1739 } else { 1740 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1741 } 1742 break; 1743 case SNDRV_PCM_STATE_RUNNING: 1744 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1745 break; 1746 case SNDRV_PCM_STATE_XRUN: 1747 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1748 break; 1749 default: 1750 break; 1751 } 1752 } else { 1753 /* stop running stream */ 1754 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1755 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1756 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1757 snd_pcm_do_stop(substream, new_state); 1758 snd_pcm_post_stop(substream, new_state); 1759 } 1760 } 1761 1762 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1763 runtime->trigger_master == substream && 1764 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1765 return substream->ops->trigger(substream, 1766 SNDRV_PCM_TRIGGER_DRAIN); 1767 1768 return 0; 1769 } 1770 1771 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1772 { 1773 } 1774 1775 static const struct action_ops snd_pcm_action_drain_init = { 1776 .pre_action = snd_pcm_pre_drain_init, 1777 .do_action = snd_pcm_do_drain_init, 1778 .post_action = snd_pcm_post_drain_init 1779 }; 1780 1781 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1782 1783 /* 1784 * Drain the stream(s). 1785 * When the substream is linked, sync until the draining of all playback streams 1786 * is finished. 1787 * After this call, all streams are supposed to be either SETUP or DRAINING 1788 * (capture only) state. 1789 */ 1790 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1791 struct file *file) 1792 { 1793 struct snd_card *card; 1794 struct snd_pcm_runtime *runtime; 1795 struct snd_pcm_substream *s; 1796 wait_queue_t wait; 1797 int result = 0; 1798 int nonblock = 0; 1799 1800 card = substream->pcm->card; 1801 runtime = substream->runtime; 1802 1803 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1804 return -EBADFD; 1805 1806 snd_power_lock(card); 1807 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1808 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1809 if (result < 0) { 1810 snd_power_unlock(card); 1811 return result; 1812 } 1813 } 1814 1815 if (file) { 1816 if (file->f_flags & O_NONBLOCK) 1817 nonblock = 1; 1818 } else if (substream->f_flags & O_NONBLOCK) 1819 nonblock = 1; 1820 1821 down_read(&snd_pcm_link_rwsem); 1822 snd_pcm_stream_lock_irq(substream); 1823 /* resume pause */ 1824 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1825 snd_pcm_pause(substream, 0); 1826 1827 /* pre-start/stop - all running streams are changed to DRAINING state */ 1828 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1829 if (result < 0) 1830 goto unlock; 1831 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1832 if (nonblock) { 1833 result = -EAGAIN; 1834 goto unlock; 1835 } 1836 1837 for (;;) { 1838 long tout; 1839 struct snd_pcm_runtime *to_check; 1840 if (signal_pending(current)) { 1841 result = -ERESTARTSYS; 1842 break; 1843 } 1844 /* find a substream to drain */ 1845 to_check = NULL; 1846 snd_pcm_group_for_each_entry(s, substream) { 1847 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1848 continue; 1849 runtime = s->runtime; 1850 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1851 to_check = runtime; 1852 break; 1853 } 1854 } 1855 if (!to_check) 1856 break; /* all drained */ 1857 init_waitqueue_entry(&wait, current); 1858 add_wait_queue(&to_check->sleep, &wait); 1859 snd_pcm_stream_unlock_irq(substream); 1860 up_read(&snd_pcm_link_rwsem); 1861 snd_power_unlock(card); 1862 if (runtime->no_period_wakeup) 1863 tout = MAX_SCHEDULE_TIMEOUT; 1864 else { 1865 tout = 10; 1866 if (runtime->rate) { 1867 long t = runtime->period_size * 2 / runtime->rate; 1868 tout = max(t, tout); 1869 } 1870 tout = msecs_to_jiffies(tout * 1000); 1871 } 1872 tout = schedule_timeout_interruptible(tout); 1873 snd_power_lock(card); 1874 down_read(&snd_pcm_link_rwsem); 1875 snd_pcm_stream_lock_irq(substream); 1876 remove_wait_queue(&to_check->sleep, &wait); 1877 if (card->shutdown) { 1878 result = -ENODEV; 1879 break; 1880 } 1881 if (tout == 0) { 1882 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1883 result = -ESTRPIPE; 1884 else { 1885 dev_dbg(substream->pcm->card->dev, 1886 "playback drain error (DMA or IRQ trouble?)\n"); 1887 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1888 result = -EIO; 1889 } 1890 break; 1891 } 1892 } 1893 1894 unlock: 1895 snd_pcm_stream_unlock_irq(substream); 1896 up_read(&snd_pcm_link_rwsem); 1897 snd_power_unlock(card); 1898 1899 return result; 1900 } 1901 1902 /* 1903 * drop ioctl 1904 * 1905 * Immediately put all linked substreams into SETUP state. 1906 */ 1907 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1908 { 1909 struct snd_pcm_runtime *runtime; 1910 int result = 0; 1911 1912 if (PCM_RUNTIME_CHECK(substream)) 1913 return -ENXIO; 1914 runtime = substream->runtime; 1915 1916 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1917 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1918 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1919 return -EBADFD; 1920 1921 snd_pcm_stream_lock_irq(substream); 1922 /* resume pause */ 1923 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1924 snd_pcm_pause(substream, 0); 1925 1926 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1927 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1928 snd_pcm_stream_unlock_irq(substream); 1929 1930 return result; 1931 } 1932 1933 1934 static bool is_pcm_file(struct file *file) 1935 { 1936 struct inode *inode = file_inode(file); 1937 unsigned int minor; 1938 1939 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1940 return false; 1941 minor = iminor(inode); 1942 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1943 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1944 } 1945 1946 /* 1947 * PCM link handling 1948 */ 1949 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1950 { 1951 int res = 0; 1952 struct snd_pcm_file *pcm_file; 1953 struct snd_pcm_substream *substream1; 1954 struct snd_pcm_group *group; 1955 struct fd f = fdget(fd); 1956 1957 if (!f.file) 1958 return -EBADFD; 1959 if (!is_pcm_file(f.file)) { 1960 res = -EBADFD; 1961 goto _badf; 1962 } 1963 pcm_file = f.file->private_data; 1964 substream1 = pcm_file->substream; 1965 group = kmalloc(sizeof(*group), GFP_KERNEL); 1966 if (!group) { 1967 res = -ENOMEM; 1968 goto _nolock; 1969 } 1970 down_write_nonblock(&snd_pcm_link_rwsem); 1971 write_lock_irq(&snd_pcm_link_rwlock); 1972 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1973 substream->runtime->status->state != substream1->runtime->status->state || 1974 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1975 res = -EBADFD; 1976 goto _end; 1977 } 1978 if (snd_pcm_stream_linked(substream1)) { 1979 res = -EALREADY; 1980 goto _end; 1981 } 1982 if (!snd_pcm_stream_linked(substream)) { 1983 substream->group = group; 1984 group = NULL; 1985 spin_lock_init(&substream->group->lock); 1986 mutex_init(&substream->group->mutex); 1987 INIT_LIST_HEAD(&substream->group->substreams); 1988 list_add_tail(&substream->link_list, &substream->group->substreams); 1989 substream->group->count = 1; 1990 } 1991 list_add_tail(&substream1->link_list, &substream->group->substreams); 1992 substream->group->count++; 1993 substream1->group = substream->group; 1994 _end: 1995 write_unlock_irq(&snd_pcm_link_rwlock); 1996 up_write(&snd_pcm_link_rwsem); 1997 _nolock: 1998 snd_card_unref(substream1->pcm->card); 1999 kfree(group); 2000 _badf: 2001 fdput(f); 2002 return res; 2003 } 2004 2005 static void relink_to_local(struct snd_pcm_substream *substream) 2006 { 2007 substream->group = &substream->self_group; 2008 INIT_LIST_HEAD(&substream->self_group.substreams); 2009 list_add_tail(&substream->link_list, &substream->self_group.substreams); 2010 } 2011 2012 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2013 { 2014 struct snd_pcm_substream *s; 2015 int res = 0; 2016 2017 down_write_nonblock(&snd_pcm_link_rwsem); 2018 write_lock_irq(&snd_pcm_link_rwlock); 2019 if (!snd_pcm_stream_linked(substream)) { 2020 res = -EALREADY; 2021 goto _end; 2022 } 2023 list_del(&substream->link_list); 2024 substream->group->count--; 2025 if (substream->group->count == 1) { /* detach the last stream, too */ 2026 snd_pcm_group_for_each_entry(s, substream) { 2027 relink_to_local(s); 2028 break; 2029 } 2030 kfree(substream->group); 2031 } 2032 relink_to_local(substream); 2033 _end: 2034 write_unlock_irq(&snd_pcm_link_rwlock); 2035 up_write(&snd_pcm_link_rwsem); 2036 return res; 2037 } 2038 2039 /* 2040 * hw configurator 2041 */ 2042 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2043 struct snd_pcm_hw_rule *rule) 2044 { 2045 struct snd_interval t; 2046 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2047 hw_param_interval_c(params, rule->deps[1]), &t); 2048 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2049 } 2050 2051 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2052 struct snd_pcm_hw_rule *rule) 2053 { 2054 struct snd_interval t; 2055 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2056 hw_param_interval_c(params, rule->deps[1]), &t); 2057 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2058 } 2059 2060 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2061 struct snd_pcm_hw_rule *rule) 2062 { 2063 struct snd_interval t; 2064 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2065 hw_param_interval_c(params, rule->deps[1]), 2066 (unsigned long) rule->private, &t); 2067 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2068 } 2069 2070 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2071 struct snd_pcm_hw_rule *rule) 2072 { 2073 struct snd_interval t; 2074 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2075 (unsigned long) rule->private, 2076 hw_param_interval_c(params, rule->deps[1]), &t); 2077 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2078 } 2079 2080 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2081 struct snd_pcm_hw_rule *rule) 2082 { 2083 unsigned int k; 2084 const struct snd_interval *i = 2085 hw_param_interval_c(params, rule->deps[0]); 2086 struct snd_mask m; 2087 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2088 snd_mask_any(&m); 2089 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2090 int bits; 2091 if (! snd_mask_test(mask, k)) 2092 continue; 2093 bits = snd_pcm_format_physical_width(k); 2094 if (bits <= 0) 2095 continue; /* ignore invalid formats */ 2096 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2097 snd_mask_reset(&m, k); 2098 } 2099 return snd_mask_refine(mask, &m); 2100 } 2101 2102 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2103 struct snd_pcm_hw_rule *rule) 2104 { 2105 struct snd_interval t; 2106 unsigned int k; 2107 t.min = UINT_MAX; 2108 t.max = 0; 2109 t.openmin = 0; 2110 t.openmax = 0; 2111 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2112 int bits; 2113 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2114 continue; 2115 bits = snd_pcm_format_physical_width(k); 2116 if (bits <= 0) 2117 continue; /* ignore invalid formats */ 2118 if (t.min > (unsigned)bits) 2119 t.min = bits; 2120 if (t.max < (unsigned)bits) 2121 t.max = bits; 2122 } 2123 t.integer = 1; 2124 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2125 } 2126 2127 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2128 #error "Change this table" 2129 #endif 2130 2131 static const unsigned int rates[] = { 2132 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2133 48000, 64000, 88200, 96000, 176400, 192000 2134 }; 2135 2136 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2137 .count = ARRAY_SIZE(rates), 2138 .list = rates, 2139 }; 2140 2141 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2142 struct snd_pcm_hw_rule *rule) 2143 { 2144 struct snd_pcm_hardware *hw = rule->private; 2145 return snd_interval_list(hw_param_interval(params, rule->var), 2146 snd_pcm_known_rates.count, 2147 snd_pcm_known_rates.list, hw->rates); 2148 } 2149 2150 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2151 struct snd_pcm_hw_rule *rule) 2152 { 2153 struct snd_interval t; 2154 struct snd_pcm_substream *substream = rule->private; 2155 t.min = 0; 2156 t.max = substream->buffer_bytes_max; 2157 t.openmin = 0; 2158 t.openmax = 0; 2159 t.integer = 1; 2160 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2161 } 2162 2163 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2164 { 2165 struct snd_pcm_runtime *runtime = substream->runtime; 2166 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2167 int k, err; 2168 2169 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2170 snd_mask_any(constrs_mask(constrs, k)); 2171 } 2172 2173 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2174 snd_interval_any(constrs_interval(constrs, k)); 2175 } 2176 2177 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2178 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2179 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2180 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2181 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2182 2183 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2184 snd_pcm_hw_rule_format, NULL, 2185 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_SAMPLE_BITS, 2189 snd_pcm_hw_rule_sample_bits, NULL, 2190 SNDRV_PCM_HW_PARAM_FORMAT, 2191 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2192 if (err < 0) 2193 return err; 2194 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2195 snd_pcm_hw_rule_div, NULL, 2196 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2197 if (err < 0) 2198 return err; 2199 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2200 snd_pcm_hw_rule_mul, NULL, 2201 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2202 if (err < 0) 2203 return err; 2204 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2205 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2206 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2207 if (err < 0) 2208 return err; 2209 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2210 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2211 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2212 if (err < 0) 2213 return err; 2214 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2215 snd_pcm_hw_rule_div, NULL, 2216 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2217 if (err < 0) 2218 return err; 2219 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2220 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2221 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2222 if (err < 0) 2223 return err; 2224 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2225 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2226 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2227 if (err < 0) 2228 return err; 2229 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2230 snd_pcm_hw_rule_div, NULL, 2231 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2232 if (err < 0) 2233 return err; 2234 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2235 snd_pcm_hw_rule_div, NULL, 2236 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2237 if (err < 0) 2238 return err; 2239 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2240 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2241 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2242 if (err < 0) 2243 return err; 2244 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2245 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2246 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2247 if (err < 0) 2248 return err; 2249 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2250 snd_pcm_hw_rule_mul, NULL, 2251 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2252 if (err < 0) 2253 return err; 2254 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2255 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2256 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2257 if (err < 0) 2258 return err; 2259 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2260 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2261 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2262 if (err < 0) 2263 return err; 2264 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2265 snd_pcm_hw_rule_muldivk, (void*) 8, 2266 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2267 if (err < 0) 2268 return err; 2269 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2270 snd_pcm_hw_rule_muldivk, (void*) 8, 2271 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2272 if (err < 0) 2273 return err; 2274 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2275 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2276 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2277 if (err < 0) 2278 return err; 2279 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2280 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2281 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2282 if (err < 0) 2283 return err; 2284 return 0; 2285 } 2286 2287 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2288 { 2289 struct snd_pcm_runtime *runtime = substream->runtime; 2290 struct snd_pcm_hardware *hw = &runtime->hw; 2291 int err; 2292 unsigned int mask = 0; 2293 2294 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2295 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2296 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2297 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2298 if (hw_support_mmap(substream)) { 2299 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2300 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2301 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2302 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2303 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2304 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2305 } 2306 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2307 if (err < 0) 2308 return err; 2309 2310 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2311 if (err < 0) 2312 return err; 2313 2314 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2315 if (err < 0) 2316 return err; 2317 2318 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2319 hw->channels_min, hw->channels_max); 2320 if (err < 0) 2321 return err; 2322 2323 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2324 hw->rate_min, hw->rate_max); 2325 if (err < 0) 2326 return err; 2327 2328 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2329 hw->period_bytes_min, hw->period_bytes_max); 2330 if (err < 0) 2331 return err; 2332 2333 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2334 hw->periods_min, hw->periods_max); 2335 if (err < 0) 2336 return err; 2337 2338 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2339 hw->period_bytes_min, hw->buffer_bytes_max); 2340 if (err < 0) 2341 return err; 2342 2343 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2344 snd_pcm_hw_rule_buffer_bytes_max, substream, 2345 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2346 if (err < 0) 2347 return err; 2348 2349 /* FIXME: remove */ 2350 if (runtime->dma_bytes) { 2351 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2352 if (err < 0) 2353 return err; 2354 } 2355 2356 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2357 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2358 snd_pcm_hw_rule_rate, hw, 2359 SNDRV_PCM_HW_PARAM_RATE, -1); 2360 if (err < 0) 2361 return err; 2362 } 2363 2364 /* FIXME: this belong to lowlevel */ 2365 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2366 2367 return 0; 2368 } 2369 2370 static void pcm_release_private(struct snd_pcm_substream *substream) 2371 { 2372 snd_pcm_unlink(substream); 2373 } 2374 2375 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2376 { 2377 substream->ref_count--; 2378 if (substream->ref_count > 0) 2379 return; 2380 2381 snd_pcm_drop(substream); 2382 if (substream->hw_opened) { 2383 if (substream->ops->hw_free && 2384 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2385 substream->ops->hw_free(substream); 2386 substream->ops->close(substream); 2387 substream->hw_opened = 0; 2388 } 2389 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2390 pm_qos_remove_request(&substream->latency_pm_qos_req); 2391 if (substream->pcm_release) { 2392 substream->pcm_release(substream); 2393 substream->pcm_release = NULL; 2394 } 2395 snd_pcm_detach_substream(substream); 2396 } 2397 2398 EXPORT_SYMBOL(snd_pcm_release_substream); 2399 2400 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2401 struct file *file, 2402 struct snd_pcm_substream **rsubstream) 2403 { 2404 struct snd_pcm_substream *substream; 2405 int err; 2406 2407 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2408 if (err < 0) 2409 return err; 2410 if (substream->ref_count > 1) { 2411 *rsubstream = substream; 2412 return 0; 2413 } 2414 2415 err = snd_pcm_hw_constraints_init(substream); 2416 if (err < 0) { 2417 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2418 goto error; 2419 } 2420 2421 if ((err = substream->ops->open(substream)) < 0) 2422 goto error; 2423 2424 substream->hw_opened = 1; 2425 2426 err = snd_pcm_hw_constraints_complete(substream); 2427 if (err < 0) { 2428 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2429 goto error; 2430 } 2431 2432 *rsubstream = substream; 2433 return 0; 2434 2435 error: 2436 snd_pcm_release_substream(substream); 2437 return err; 2438 } 2439 2440 EXPORT_SYMBOL(snd_pcm_open_substream); 2441 2442 static int snd_pcm_open_file(struct file *file, 2443 struct snd_pcm *pcm, 2444 int stream) 2445 { 2446 struct snd_pcm_file *pcm_file; 2447 struct snd_pcm_substream *substream; 2448 int err; 2449 2450 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2451 if (err < 0) 2452 return err; 2453 2454 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2455 if (pcm_file == NULL) { 2456 snd_pcm_release_substream(substream); 2457 return -ENOMEM; 2458 } 2459 pcm_file->substream = substream; 2460 if (substream->ref_count == 1) { 2461 substream->file = pcm_file; 2462 substream->pcm_release = pcm_release_private; 2463 } 2464 file->private_data = pcm_file; 2465 2466 return 0; 2467 } 2468 2469 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2470 { 2471 struct snd_pcm *pcm; 2472 int err = nonseekable_open(inode, file); 2473 if (err < 0) 2474 return err; 2475 pcm = snd_lookup_minor_data(iminor(inode), 2476 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2477 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2478 if (pcm) 2479 snd_card_unref(pcm->card); 2480 return err; 2481 } 2482 2483 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2484 { 2485 struct snd_pcm *pcm; 2486 int err = nonseekable_open(inode, file); 2487 if (err < 0) 2488 return err; 2489 pcm = snd_lookup_minor_data(iminor(inode), 2490 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2491 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2492 if (pcm) 2493 snd_card_unref(pcm->card); 2494 return err; 2495 } 2496 2497 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2498 { 2499 int err; 2500 wait_queue_t wait; 2501 2502 if (pcm == NULL) { 2503 err = -ENODEV; 2504 goto __error1; 2505 } 2506 err = snd_card_file_add(pcm->card, file); 2507 if (err < 0) 2508 goto __error1; 2509 if (!try_module_get(pcm->card->module)) { 2510 err = -EFAULT; 2511 goto __error2; 2512 } 2513 init_waitqueue_entry(&wait, current); 2514 add_wait_queue(&pcm->open_wait, &wait); 2515 mutex_lock(&pcm->open_mutex); 2516 while (1) { 2517 err = snd_pcm_open_file(file, pcm, stream); 2518 if (err >= 0) 2519 break; 2520 if (err == -EAGAIN) { 2521 if (file->f_flags & O_NONBLOCK) { 2522 err = -EBUSY; 2523 break; 2524 } 2525 } else 2526 break; 2527 set_current_state(TASK_INTERRUPTIBLE); 2528 mutex_unlock(&pcm->open_mutex); 2529 schedule(); 2530 mutex_lock(&pcm->open_mutex); 2531 if (pcm->card->shutdown) { 2532 err = -ENODEV; 2533 break; 2534 } 2535 if (signal_pending(current)) { 2536 err = -ERESTARTSYS; 2537 break; 2538 } 2539 } 2540 remove_wait_queue(&pcm->open_wait, &wait); 2541 mutex_unlock(&pcm->open_mutex); 2542 if (err < 0) 2543 goto __error; 2544 return err; 2545 2546 __error: 2547 module_put(pcm->card->module); 2548 __error2: 2549 snd_card_file_remove(pcm->card, file); 2550 __error1: 2551 return err; 2552 } 2553 2554 static int snd_pcm_release(struct inode *inode, struct file *file) 2555 { 2556 struct snd_pcm *pcm; 2557 struct snd_pcm_substream *substream; 2558 struct snd_pcm_file *pcm_file; 2559 2560 pcm_file = file->private_data; 2561 substream = pcm_file->substream; 2562 if (snd_BUG_ON(!substream)) 2563 return -ENXIO; 2564 pcm = substream->pcm; 2565 mutex_lock(&pcm->open_mutex); 2566 snd_pcm_release_substream(substream); 2567 kfree(pcm_file); 2568 mutex_unlock(&pcm->open_mutex); 2569 wake_up(&pcm->open_wait); 2570 module_put(pcm->card->module); 2571 snd_card_file_remove(pcm->card, file); 2572 return 0; 2573 } 2574 2575 /* check and update PCM state; return 0 or a negative error 2576 * call this inside PCM lock 2577 */ 2578 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2579 { 2580 switch (substream->runtime->status->state) { 2581 case SNDRV_PCM_STATE_DRAINING: 2582 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2583 return -EBADFD; 2584 /* Fall through */ 2585 case SNDRV_PCM_STATE_RUNNING: 2586 return snd_pcm_update_hw_ptr(substream); 2587 case SNDRV_PCM_STATE_PREPARED: 2588 case SNDRV_PCM_STATE_PAUSED: 2589 return 0; 2590 case SNDRV_PCM_STATE_SUSPENDED: 2591 return -ESTRPIPE; 2592 case SNDRV_PCM_STATE_XRUN: 2593 return -EPIPE; 2594 default: 2595 return -EBADFD; 2596 } 2597 } 2598 2599 /* update to the given appl_ptr and call ack callback if needed; 2600 * when an error is returned, take back to the original value 2601 */ 2602 static int apply_appl_ptr(struct snd_pcm_substream *substream, 2603 snd_pcm_uframes_t appl_ptr) 2604 { 2605 struct snd_pcm_runtime *runtime = substream->runtime; 2606 snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr; 2607 int ret; 2608 2609 runtime->control->appl_ptr = appl_ptr; 2610 if (substream->ops->ack) { 2611 ret = substream->ops->ack(substream); 2612 if (ret < 0) { 2613 runtime->control->appl_ptr = old_appl_ptr; 2614 return ret; 2615 } 2616 } 2617 return 0; 2618 } 2619 2620 /* increase the appl_ptr; returns the processed frames or a negative error */ 2621 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2622 snd_pcm_uframes_t frames, 2623 snd_pcm_sframes_t avail) 2624 { 2625 struct snd_pcm_runtime *runtime = substream->runtime; 2626 snd_pcm_sframes_t appl_ptr; 2627 int ret; 2628 2629 if (avail <= 0) 2630 return 0; 2631 if (frames > (snd_pcm_uframes_t)avail) 2632 frames = avail; 2633 appl_ptr = runtime->control->appl_ptr + frames; 2634 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2635 appl_ptr -= runtime->boundary; 2636 ret = apply_appl_ptr(substream, appl_ptr); 2637 return ret < 0 ? ret : frames; 2638 } 2639 2640 /* decrease the appl_ptr; returns the processed frames or a negative error */ 2641 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2642 snd_pcm_uframes_t frames, 2643 snd_pcm_sframes_t avail) 2644 { 2645 struct snd_pcm_runtime *runtime = substream->runtime; 2646 snd_pcm_sframes_t appl_ptr; 2647 int ret; 2648 2649 if (avail <= 0) 2650 return 0; 2651 if (frames > (snd_pcm_uframes_t)avail) 2652 frames = avail; 2653 appl_ptr = runtime->control->appl_ptr - frames; 2654 if (appl_ptr < 0) 2655 appl_ptr += runtime->boundary; 2656 ret = apply_appl_ptr(substream, appl_ptr); 2657 return ret < 0 ? ret : frames; 2658 } 2659 2660 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2661 snd_pcm_uframes_t frames) 2662 { 2663 struct snd_pcm_runtime *runtime = substream->runtime; 2664 snd_pcm_sframes_t ret; 2665 2666 if (frames == 0) 2667 return 0; 2668 2669 snd_pcm_stream_lock_irq(substream); 2670 ret = do_pcm_hwsync(substream); 2671 if (!ret) 2672 ret = rewind_appl_ptr(substream, frames, 2673 snd_pcm_playback_hw_avail(runtime)); 2674 snd_pcm_stream_unlock_irq(substream); 2675 return ret; 2676 } 2677 2678 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2679 snd_pcm_uframes_t frames) 2680 { 2681 struct snd_pcm_runtime *runtime = substream->runtime; 2682 snd_pcm_sframes_t ret; 2683 2684 if (frames == 0) 2685 return 0; 2686 2687 snd_pcm_stream_lock_irq(substream); 2688 ret = do_pcm_hwsync(substream); 2689 if (!ret) 2690 ret = rewind_appl_ptr(substream, frames, 2691 snd_pcm_capture_hw_avail(runtime)); 2692 snd_pcm_stream_unlock_irq(substream); 2693 return ret; 2694 } 2695 2696 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2697 snd_pcm_uframes_t frames) 2698 { 2699 struct snd_pcm_runtime *runtime = substream->runtime; 2700 snd_pcm_sframes_t ret; 2701 2702 if (frames == 0) 2703 return 0; 2704 2705 snd_pcm_stream_lock_irq(substream); 2706 ret = do_pcm_hwsync(substream); 2707 if (!ret) 2708 ret = forward_appl_ptr(substream, frames, 2709 snd_pcm_playback_avail(runtime)); 2710 snd_pcm_stream_unlock_irq(substream); 2711 return ret; 2712 } 2713 2714 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2715 snd_pcm_uframes_t frames) 2716 { 2717 struct snd_pcm_runtime *runtime = substream->runtime; 2718 snd_pcm_sframes_t ret; 2719 2720 if (frames == 0) 2721 return 0; 2722 2723 snd_pcm_stream_lock_irq(substream); 2724 ret = do_pcm_hwsync(substream); 2725 if (!ret) 2726 ret = forward_appl_ptr(substream, frames, 2727 snd_pcm_capture_avail(runtime)); 2728 snd_pcm_stream_unlock_irq(substream); 2729 return ret; 2730 } 2731 2732 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2733 { 2734 int err; 2735 2736 snd_pcm_stream_lock_irq(substream); 2737 err = do_pcm_hwsync(substream); 2738 snd_pcm_stream_unlock_irq(substream); 2739 return err; 2740 } 2741 2742 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream) 2743 { 2744 struct snd_pcm_runtime *runtime = substream->runtime; 2745 int err; 2746 snd_pcm_sframes_t n = 0; 2747 2748 snd_pcm_stream_lock_irq(substream); 2749 err = do_pcm_hwsync(substream); 2750 if (!err) { 2751 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2752 n = snd_pcm_playback_hw_avail(runtime); 2753 else 2754 n = snd_pcm_capture_avail(runtime); 2755 n += runtime->delay; 2756 } 2757 snd_pcm_stream_unlock_irq(substream); 2758 return err < 0 ? err : n; 2759 } 2760 2761 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2762 struct snd_pcm_sync_ptr __user *_sync_ptr) 2763 { 2764 struct snd_pcm_runtime *runtime = substream->runtime; 2765 struct snd_pcm_sync_ptr sync_ptr; 2766 volatile struct snd_pcm_mmap_status *status; 2767 volatile struct snd_pcm_mmap_control *control; 2768 int err; 2769 2770 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2771 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2772 return -EFAULT; 2773 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2774 return -EFAULT; 2775 status = runtime->status; 2776 control = runtime->control; 2777 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2778 err = snd_pcm_hwsync(substream); 2779 if (err < 0) 2780 return err; 2781 } 2782 snd_pcm_stream_lock_irq(substream); 2783 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2784 err = apply_appl_ptr(substream, sync_ptr.c.control.appl_ptr); 2785 if (err < 0) { 2786 snd_pcm_stream_unlock_irq(substream); 2787 return err; 2788 } 2789 } else { 2790 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2791 } 2792 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2793 control->avail_min = sync_ptr.c.control.avail_min; 2794 else 2795 sync_ptr.c.control.avail_min = control->avail_min; 2796 sync_ptr.s.status.state = status->state; 2797 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2798 sync_ptr.s.status.tstamp = status->tstamp; 2799 sync_ptr.s.status.suspended_state = status->suspended_state; 2800 snd_pcm_stream_unlock_irq(substream); 2801 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2802 return -EFAULT; 2803 return 0; 2804 } 2805 2806 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2807 { 2808 struct snd_pcm_runtime *runtime = substream->runtime; 2809 int arg; 2810 2811 if (get_user(arg, _arg)) 2812 return -EFAULT; 2813 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2814 return -EINVAL; 2815 runtime->tstamp_type = arg; 2816 return 0; 2817 } 2818 2819 static int snd_pcm_common_ioctl1(struct file *file, 2820 struct snd_pcm_substream *substream, 2821 unsigned int cmd, void __user *arg) 2822 { 2823 switch (cmd) { 2824 case SNDRV_PCM_IOCTL_PVERSION: 2825 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2826 case SNDRV_PCM_IOCTL_INFO: 2827 return snd_pcm_info_user(substream, arg); 2828 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2829 return 0; 2830 case SNDRV_PCM_IOCTL_TTSTAMP: 2831 return snd_pcm_tstamp(substream, arg); 2832 case SNDRV_PCM_IOCTL_HW_REFINE: 2833 return snd_pcm_hw_refine_user(substream, arg); 2834 case SNDRV_PCM_IOCTL_HW_PARAMS: 2835 return snd_pcm_hw_params_user(substream, arg); 2836 case SNDRV_PCM_IOCTL_HW_FREE: 2837 return snd_pcm_hw_free(substream); 2838 case SNDRV_PCM_IOCTL_SW_PARAMS: 2839 return snd_pcm_sw_params_user(substream, arg); 2840 case SNDRV_PCM_IOCTL_STATUS: 2841 return snd_pcm_status_user(substream, arg, false); 2842 case SNDRV_PCM_IOCTL_STATUS_EXT: 2843 return snd_pcm_status_user(substream, arg, true); 2844 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2845 return snd_pcm_channel_info_user(substream, arg); 2846 case SNDRV_PCM_IOCTL_PREPARE: 2847 return snd_pcm_prepare(substream, file); 2848 case SNDRV_PCM_IOCTL_RESET: 2849 return snd_pcm_reset(substream); 2850 case SNDRV_PCM_IOCTL_START: 2851 return snd_pcm_start_lock_irq(substream); 2852 case SNDRV_PCM_IOCTL_LINK: 2853 return snd_pcm_link(substream, (int)(unsigned long) arg); 2854 case SNDRV_PCM_IOCTL_UNLINK: 2855 return snd_pcm_unlink(substream); 2856 case SNDRV_PCM_IOCTL_RESUME: 2857 return snd_pcm_resume(substream); 2858 case SNDRV_PCM_IOCTL_XRUN: 2859 return snd_pcm_xrun(substream); 2860 case SNDRV_PCM_IOCTL_HWSYNC: 2861 return snd_pcm_hwsync(substream); 2862 case SNDRV_PCM_IOCTL_DELAY: 2863 { 2864 snd_pcm_sframes_t delay = snd_pcm_delay(substream); 2865 snd_pcm_sframes_t __user *res = arg; 2866 2867 if (delay < 0) 2868 return delay; 2869 if (put_user(delay, res)) 2870 return -EFAULT; 2871 return 0; 2872 } 2873 case SNDRV_PCM_IOCTL_SYNC_PTR: 2874 return snd_pcm_sync_ptr(substream, arg); 2875 #ifdef CONFIG_SND_SUPPORT_OLD_API 2876 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2877 return snd_pcm_hw_refine_old_user(substream, arg); 2878 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2879 return snd_pcm_hw_params_old_user(substream, arg); 2880 #endif 2881 case SNDRV_PCM_IOCTL_DRAIN: 2882 return snd_pcm_drain(substream, file); 2883 case SNDRV_PCM_IOCTL_DROP: 2884 return snd_pcm_drop(substream); 2885 case SNDRV_PCM_IOCTL_PAUSE: 2886 { 2887 int res; 2888 snd_pcm_stream_lock_irq(substream); 2889 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2890 snd_pcm_stream_unlock_irq(substream); 2891 return res; 2892 } 2893 } 2894 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2895 return -ENOTTY; 2896 } 2897 2898 static int snd_pcm_playback_ioctl1(struct file *file, 2899 struct snd_pcm_substream *substream, 2900 unsigned int cmd, void __user *arg) 2901 { 2902 if (snd_BUG_ON(!substream)) 2903 return -ENXIO; 2904 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2905 return -EINVAL; 2906 switch (cmd) { 2907 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2908 { 2909 struct snd_xferi xferi; 2910 struct snd_xferi __user *_xferi = arg; 2911 struct snd_pcm_runtime *runtime = substream->runtime; 2912 snd_pcm_sframes_t result; 2913 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2914 return -EBADFD; 2915 if (put_user(0, &_xferi->result)) 2916 return -EFAULT; 2917 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2918 return -EFAULT; 2919 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2920 __put_user(result, &_xferi->result); 2921 return result < 0 ? result : 0; 2922 } 2923 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2924 { 2925 struct snd_xfern xfern; 2926 struct snd_xfern __user *_xfern = arg; 2927 struct snd_pcm_runtime *runtime = substream->runtime; 2928 void __user **bufs; 2929 snd_pcm_sframes_t result; 2930 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2931 return -EBADFD; 2932 if (runtime->channels > 128) 2933 return -EINVAL; 2934 if (put_user(0, &_xfern->result)) 2935 return -EFAULT; 2936 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2937 return -EFAULT; 2938 2939 bufs = memdup_user(xfern.bufs, 2940 sizeof(void *) * runtime->channels); 2941 if (IS_ERR(bufs)) 2942 return PTR_ERR(bufs); 2943 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2944 kfree(bufs); 2945 __put_user(result, &_xfern->result); 2946 return result < 0 ? result : 0; 2947 } 2948 case SNDRV_PCM_IOCTL_REWIND: 2949 { 2950 snd_pcm_uframes_t frames; 2951 snd_pcm_uframes_t __user *_frames = arg; 2952 snd_pcm_sframes_t result; 2953 if (get_user(frames, _frames)) 2954 return -EFAULT; 2955 if (put_user(0, _frames)) 2956 return -EFAULT; 2957 result = snd_pcm_playback_rewind(substream, frames); 2958 __put_user(result, _frames); 2959 return result < 0 ? result : 0; 2960 } 2961 case SNDRV_PCM_IOCTL_FORWARD: 2962 { 2963 snd_pcm_uframes_t frames; 2964 snd_pcm_uframes_t __user *_frames = arg; 2965 snd_pcm_sframes_t result; 2966 if (get_user(frames, _frames)) 2967 return -EFAULT; 2968 if (put_user(0, _frames)) 2969 return -EFAULT; 2970 result = snd_pcm_playback_forward(substream, frames); 2971 __put_user(result, _frames); 2972 return result < 0 ? result : 0; 2973 } 2974 } 2975 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2976 } 2977 2978 static int snd_pcm_capture_ioctl1(struct file *file, 2979 struct snd_pcm_substream *substream, 2980 unsigned int cmd, void __user *arg) 2981 { 2982 if (snd_BUG_ON(!substream)) 2983 return -ENXIO; 2984 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2985 return -EINVAL; 2986 switch (cmd) { 2987 case SNDRV_PCM_IOCTL_READI_FRAMES: 2988 { 2989 struct snd_xferi xferi; 2990 struct snd_xferi __user *_xferi = arg; 2991 struct snd_pcm_runtime *runtime = substream->runtime; 2992 snd_pcm_sframes_t result; 2993 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2994 return -EBADFD; 2995 if (put_user(0, &_xferi->result)) 2996 return -EFAULT; 2997 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2998 return -EFAULT; 2999 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 3000 __put_user(result, &_xferi->result); 3001 return result < 0 ? result : 0; 3002 } 3003 case SNDRV_PCM_IOCTL_READN_FRAMES: 3004 { 3005 struct snd_xfern xfern; 3006 struct snd_xfern __user *_xfern = arg; 3007 struct snd_pcm_runtime *runtime = substream->runtime; 3008 void *bufs; 3009 snd_pcm_sframes_t result; 3010 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3011 return -EBADFD; 3012 if (runtime->channels > 128) 3013 return -EINVAL; 3014 if (put_user(0, &_xfern->result)) 3015 return -EFAULT; 3016 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 3017 return -EFAULT; 3018 3019 bufs = memdup_user(xfern.bufs, 3020 sizeof(void *) * runtime->channels); 3021 if (IS_ERR(bufs)) 3022 return PTR_ERR(bufs); 3023 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 3024 kfree(bufs); 3025 __put_user(result, &_xfern->result); 3026 return result < 0 ? result : 0; 3027 } 3028 case SNDRV_PCM_IOCTL_REWIND: 3029 { 3030 snd_pcm_uframes_t frames; 3031 snd_pcm_uframes_t __user *_frames = arg; 3032 snd_pcm_sframes_t result; 3033 if (get_user(frames, _frames)) 3034 return -EFAULT; 3035 if (put_user(0, _frames)) 3036 return -EFAULT; 3037 result = snd_pcm_capture_rewind(substream, frames); 3038 __put_user(result, _frames); 3039 return result < 0 ? result : 0; 3040 } 3041 case SNDRV_PCM_IOCTL_FORWARD: 3042 { 3043 snd_pcm_uframes_t frames; 3044 snd_pcm_uframes_t __user *_frames = arg; 3045 snd_pcm_sframes_t result; 3046 if (get_user(frames, _frames)) 3047 return -EFAULT; 3048 if (put_user(0, _frames)) 3049 return -EFAULT; 3050 result = snd_pcm_capture_forward(substream, frames); 3051 __put_user(result, _frames); 3052 return result < 0 ? result : 0; 3053 } 3054 } 3055 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 3056 } 3057 3058 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 3059 unsigned long arg) 3060 { 3061 struct snd_pcm_file *pcm_file; 3062 3063 pcm_file = file->private_data; 3064 3065 if (((cmd >> 8) & 0xff) != 'A') 3066 return -ENOTTY; 3067 3068 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 3069 (void __user *)arg); 3070 } 3071 3072 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 3073 unsigned long arg) 3074 { 3075 struct snd_pcm_file *pcm_file; 3076 3077 pcm_file = file->private_data; 3078 3079 if (((cmd >> 8) & 0xff) != 'A') 3080 return -ENOTTY; 3081 3082 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 3083 (void __user *)arg); 3084 } 3085 3086 /** 3087 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3088 * @substream: PCM substream 3089 * @cmd: IOCTL cmd 3090 * @arg: IOCTL argument 3091 * 3092 * The function is provided primarily for OSS layer and USB gadget drivers, 3093 * and it allows only the limited set of ioctls (hw_params, sw_params, 3094 * prepare, start, drain, drop, forward). 3095 */ 3096 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3097 unsigned int cmd, void *arg) 3098 { 3099 snd_pcm_uframes_t *frames = arg; 3100 snd_pcm_sframes_t result; 3101 3102 switch (cmd) { 3103 case SNDRV_PCM_IOCTL_FORWARD: 3104 { 3105 /* provided only for OSS; capture-only and no value returned */ 3106 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3107 return -EINVAL; 3108 result = snd_pcm_capture_forward(substream, *frames); 3109 return result < 0 ? result : 0; 3110 } 3111 case SNDRV_PCM_IOCTL_HW_PARAMS: 3112 return snd_pcm_hw_params(substream, arg); 3113 case SNDRV_PCM_IOCTL_SW_PARAMS: 3114 return snd_pcm_sw_params(substream, arg); 3115 case SNDRV_PCM_IOCTL_PREPARE: 3116 return snd_pcm_prepare(substream, NULL); 3117 case SNDRV_PCM_IOCTL_START: 3118 return snd_pcm_start_lock_irq(substream); 3119 case SNDRV_PCM_IOCTL_DRAIN: 3120 return snd_pcm_drain(substream, NULL); 3121 case SNDRV_PCM_IOCTL_DROP: 3122 return snd_pcm_drop(substream); 3123 case SNDRV_PCM_IOCTL_DELAY: 3124 { 3125 result = snd_pcm_delay(substream); 3126 if (result < 0) 3127 return result; 3128 *frames = result; 3129 return 0; 3130 } 3131 default: 3132 return -EINVAL; 3133 } 3134 } 3135 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3136 3137 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3138 loff_t * offset) 3139 { 3140 struct snd_pcm_file *pcm_file; 3141 struct snd_pcm_substream *substream; 3142 struct snd_pcm_runtime *runtime; 3143 snd_pcm_sframes_t result; 3144 3145 pcm_file = file->private_data; 3146 substream = pcm_file->substream; 3147 if (PCM_RUNTIME_CHECK(substream)) 3148 return -ENXIO; 3149 runtime = substream->runtime; 3150 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3151 return -EBADFD; 3152 if (!frame_aligned(runtime, count)) 3153 return -EINVAL; 3154 count = bytes_to_frames(runtime, count); 3155 result = snd_pcm_lib_read(substream, buf, count); 3156 if (result > 0) 3157 result = frames_to_bytes(runtime, result); 3158 return result; 3159 } 3160 3161 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3162 size_t count, loff_t * offset) 3163 { 3164 struct snd_pcm_file *pcm_file; 3165 struct snd_pcm_substream *substream; 3166 struct snd_pcm_runtime *runtime; 3167 snd_pcm_sframes_t result; 3168 3169 pcm_file = file->private_data; 3170 substream = pcm_file->substream; 3171 if (PCM_RUNTIME_CHECK(substream)) 3172 return -ENXIO; 3173 runtime = substream->runtime; 3174 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3175 return -EBADFD; 3176 if (!frame_aligned(runtime, count)) 3177 return -EINVAL; 3178 count = bytes_to_frames(runtime, count); 3179 result = snd_pcm_lib_write(substream, buf, count); 3180 if (result > 0) 3181 result = frames_to_bytes(runtime, result); 3182 return result; 3183 } 3184 3185 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3186 { 3187 struct snd_pcm_file *pcm_file; 3188 struct snd_pcm_substream *substream; 3189 struct snd_pcm_runtime *runtime; 3190 snd_pcm_sframes_t result; 3191 unsigned long i; 3192 void __user **bufs; 3193 snd_pcm_uframes_t frames; 3194 3195 pcm_file = iocb->ki_filp->private_data; 3196 substream = pcm_file->substream; 3197 if (PCM_RUNTIME_CHECK(substream)) 3198 return -ENXIO; 3199 runtime = substream->runtime; 3200 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3201 return -EBADFD; 3202 if (!iter_is_iovec(to)) 3203 return -EINVAL; 3204 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3205 return -EINVAL; 3206 if (!frame_aligned(runtime, to->iov->iov_len)) 3207 return -EINVAL; 3208 frames = bytes_to_samples(runtime, to->iov->iov_len); 3209 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3210 if (bufs == NULL) 3211 return -ENOMEM; 3212 for (i = 0; i < to->nr_segs; ++i) 3213 bufs[i] = to->iov[i].iov_base; 3214 result = snd_pcm_lib_readv(substream, bufs, frames); 3215 if (result > 0) 3216 result = frames_to_bytes(runtime, result); 3217 kfree(bufs); 3218 return result; 3219 } 3220 3221 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3222 { 3223 struct snd_pcm_file *pcm_file; 3224 struct snd_pcm_substream *substream; 3225 struct snd_pcm_runtime *runtime; 3226 snd_pcm_sframes_t result; 3227 unsigned long i; 3228 void __user **bufs; 3229 snd_pcm_uframes_t frames; 3230 3231 pcm_file = iocb->ki_filp->private_data; 3232 substream = pcm_file->substream; 3233 if (PCM_RUNTIME_CHECK(substream)) 3234 return -ENXIO; 3235 runtime = substream->runtime; 3236 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3237 return -EBADFD; 3238 if (!iter_is_iovec(from)) 3239 return -EINVAL; 3240 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3241 !frame_aligned(runtime, from->iov->iov_len)) 3242 return -EINVAL; 3243 frames = bytes_to_samples(runtime, from->iov->iov_len); 3244 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3245 if (bufs == NULL) 3246 return -ENOMEM; 3247 for (i = 0; i < from->nr_segs; ++i) 3248 bufs[i] = from->iov[i].iov_base; 3249 result = snd_pcm_lib_writev(substream, bufs, frames); 3250 if (result > 0) 3251 result = frames_to_bytes(runtime, result); 3252 kfree(bufs); 3253 return result; 3254 } 3255 3256 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3257 { 3258 struct snd_pcm_file *pcm_file; 3259 struct snd_pcm_substream *substream; 3260 struct snd_pcm_runtime *runtime; 3261 unsigned int mask; 3262 snd_pcm_uframes_t avail; 3263 3264 pcm_file = file->private_data; 3265 3266 substream = pcm_file->substream; 3267 if (PCM_RUNTIME_CHECK(substream)) 3268 return POLLOUT | POLLWRNORM | POLLERR; 3269 runtime = substream->runtime; 3270 3271 poll_wait(file, &runtime->sleep, wait); 3272 3273 snd_pcm_stream_lock_irq(substream); 3274 avail = snd_pcm_playback_avail(runtime); 3275 switch (runtime->status->state) { 3276 case SNDRV_PCM_STATE_RUNNING: 3277 case SNDRV_PCM_STATE_PREPARED: 3278 case SNDRV_PCM_STATE_PAUSED: 3279 if (avail >= runtime->control->avail_min) { 3280 mask = POLLOUT | POLLWRNORM; 3281 break; 3282 } 3283 /* Fall through */ 3284 case SNDRV_PCM_STATE_DRAINING: 3285 mask = 0; 3286 break; 3287 default: 3288 mask = POLLOUT | POLLWRNORM | POLLERR; 3289 break; 3290 } 3291 snd_pcm_stream_unlock_irq(substream); 3292 return mask; 3293 } 3294 3295 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3296 { 3297 struct snd_pcm_file *pcm_file; 3298 struct snd_pcm_substream *substream; 3299 struct snd_pcm_runtime *runtime; 3300 unsigned int mask; 3301 snd_pcm_uframes_t avail; 3302 3303 pcm_file = file->private_data; 3304 3305 substream = pcm_file->substream; 3306 if (PCM_RUNTIME_CHECK(substream)) 3307 return POLLIN | POLLRDNORM | POLLERR; 3308 runtime = substream->runtime; 3309 3310 poll_wait(file, &runtime->sleep, wait); 3311 3312 snd_pcm_stream_lock_irq(substream); 3313 avail = snd_pcm_capture_avail(runtime); 3314 switch (runtime->status->state) { 3315 case SNDRV_PCM_STATE_RUNNING: 3316 case SNDRV_PCM_STATE_PREPARED: 3317 case SNDRV_PCM_STATE_PAUSED: 3318 if (avail >= runtime->control->avail_min) { 3319 mask = POLLIN | POLLRDNORM; 3320 break; 3321 } 3322 mask = 0; 3323 break; 3324 case SNDRV_PCM_STATE_DRAINING: 3325 if (avail > 0) { 3326 mask = POLLIN | POLLRDNORM; 3327 break; 3328 } 3329 /* Fall through */ 3330 default: 3331 mask = POLLIN | POLLRDNORM | POLLERR; 3332 break; 3333 } 3334 snd_pcm_stream_unlock_irq(substream); 3335 return mask; 3336 } 3337 3338 /* 3339 * mmap support 3340 */ 3341 3342 /* 3343 * Only on coherent architectures, we can mmap the status and the control records 3344 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3345 */ 3346 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3347 /* 3348 * mmap status record 3349 */ 3350 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3351 { 3352 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3353 struct snd_pcm_runtime *runtime; 3354 3355 if (substream == NULL) 3356 return VM_FAULT_SIGBUS; 3357 runtime = substream->runtime; 3358 vmf->page = virt_to_page(runtime->status); 3359 get_page(vmf->page); 3360 return 0; 3361 } 3362 3363 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3364 { 3365 .fault = snd_pcm_mmap_status_fault, 3366 }; 3367 3368 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3369 struct vm_area_struct *area) 3370 { 3371 long size; 3372 if (!(area->vm_flags & VM_READ)) 3373 return -EINVAL; 3374 size = area->vm_end - area->vm_start; 3375 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3376 return -EINVAL; 3377 area->vm_ops = &snd_pcm_vm_ops_status; 3378 area->vm_private_data = substream; 3379 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3380 return 0; 3381 } 3382 3383 /* 3384 * mmap control record 3385 */ 3386 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3387 { 3388 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3389 struct snd_pcm_runtime *runtime; 3390 3391 if (substream == NULL) 3392 return VM_FAULT_SIGBUS; 3393 runtime = substream->runtime; 3394 vmf->page = virt_to_page(runtime->control); 3395 get_page(vmf->page); 3396 return 0; 3397 } 3398 3399 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3400 { 3401 .fault = snd_pcm_mmap_control_fault, 3402 }; 3403 3404 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3405 struct vm_area_struct *area) 3406 { 3407 long size; 3408 if (!(area->vm_flags & VM_READ)) 3409 return -EINVAL; 3410 size = area->vm_end - area->vm_start; 3411 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3412 return -EINVAL; 3413 area->vm_ops = &snd_pcm_vm_ops_control; 3414 area->vm_private_data = substream; 3415 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3416 return 0; 3417 } 3418 #else /* ! coherent mmap */ 3419 /* 3420 * don't support mmap for status and control records. 3421 */ 3422 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3423 struct vm_area_struct *area) 3424 { 3425 return -ENXIO; 3426 } 3427 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3428 struct vm_area_struct *area) 3429 { 3430 return -ENXIO; 3431 } 3432 #endif /* coherent mmap */ 3433 3434 static inline struct page * 3435 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3436 { 3437 void *vaddr = substream->runtime->dma_area + ofs; 3438 return virt_to_page(vaddr); 3439 } 3440 3441 /* 3442 * fault callback for mmapping a RAM page 3443 */ 3444 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3445 { 3446 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3447 struct snd_pcm_runtime *runtime; 3448 unsigned long offset; 3449 struct page * page; 3450 size_t dma_bytes; 3451 3452 if (substream == NULL) 3453 return VM_FAULT_SIGBUS; 3454 runtime = substream->runtime; 3455 offset = vmf->pgoff << PAGE_SHIFT; 3456 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3457 if (offset > dma_bytes - PAGE_SIZE) 3458 return VM_FAULT_SIGBUS; 3459 if (substream->ops->page) 3460 page = substream->ops->page(substream, offset); 3461 else 3462 page = snd_pcm_default_page_ops(substream, offset); 3463 if (!page) 3464 return VM_FAULT_SIGBUS; 3465 get_page(page); 3466 vmf->page = page; 3467 return 0; 3468 } 3469 3470 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3471 .open = snd_pcm_mmap_data_open, 3472 .close = snd_pcm_mmap_data_close, 3473 }; 3474 3475 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3476 .open = snd_pcm_mmap_data_open, 3477 .close = snd_pcm_mmap_data_close, 3478 .fault = snd_pcm_mmap_data_fault, 3479 }; 3480 3481 /* 3482 * mmap the DMA buffer on RAM 3483 */ 3484 3485 /** 3486 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3487 * @substream: PCM substream 3488 * @area: VMA 3489 * 3490 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3491 * this function is invoked implicitly. 3492 */ 3493 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3494 struct vm_area_struct *area) 3495 { 3496 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3497 #ifdef CONFIG_GENERIC_ALLOCATOR 3498 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3499 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3500 return remap_pfn_range(area, area->vm_start, 3501 substream->dma_buffer.addr >> PAGE_SHIFT, 3502 area->vm_end - area->vm_start, area->vm_page_prot); 3503 } 3504 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3505 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3506 if (!substream->ops->page && 3507 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3508 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3509 area, 3510 substream->runtime->dma_area, 3511 substream->runtime->dma_addr, 3512 area->vm_end - area->vm_start); 3513 #endif /* CONFIG_X86 */ 3514 /* mmap with fault handler */ 3515 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3516 return 0; 3517 } 3518 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3519 3520 /* 3521 * mmap the DMA buffer on I/O memory area 3522 */ 3523 #if SNDRV_PCM_INFO_MMAP_IOMEM 3524 /** 3525 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3526 * @substream: PCM substream 3527 * @area: VMA 3528 * 3529 * When your hardware uses the iomapped pages as the hardware buffer and 3530 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3531 * is supposed to work only on limited architectures. 3532 */ 3533 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3534 struct vm_area_struct *area) 3535 { 3536 struct snd_pcm_runtime *runtime = substream->runtime;; 3537 3538 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3539 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3540 } 3541 3542 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3543 #endif /* SNDRV_PCM_INFO_MMAP */ 3544 3545 /* 3546 * mmap DMA buffer 3547 */ 3548 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3549 struct vm_area_struct *area) 3550 { 3551 struct snd_pcm_runtime *runtime; 3552 long size; 3553 unsigned long offset; 3554 size_t dma_bytes; 3555 int err; 3556 3557 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3558 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3559 return -EINVAL; 3560 } else { 3561 if (!(area->vm_flags & VM_READ)) 3562 return -EINVAL; 3563 } 3564 runtime = substream->runtime; 3565 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3566 return -EBADFD; 3567 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3568 return -ENXIO; 3569 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3570 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3571 return -EINVAL; 3572 size = area->vm_end - area->vm_start; 3573 offset = area->vm_pgoff << PAGE_SHIFT; 3574 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3575 if ((size_t)size > dma_bytes) 3576 return -EINVAL; 3577 if (offset > dma_bytes - size) 3578 return -EINVAL; 3579 3580 area->vm_ops = &snd_pcm_vm_ops_data; 3581 area->vm_private_data = substream; 3582 if (substream->ops->mmap) 3583 err = substream->ops->mmap(substream, area); 3584 else 3585 err = snd_pcm_lib_default_mmap(substream, area); 3586 if (!err) 3587 atomic_inc(&substream->mmap_count); 3588 return err; 3589 } 3590 3591 EXPORT_SYMBOL(snd_pcm_mmap_data); 3592 3593 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3594 { 3595 struct snd_pcm_file * pcm_file; 3596 struct snd_pcm_substream *substream; 3597 unsigned long offset; 3598 3599 pcm_file = file->private_data; 3600 substream = pcm_file->substream; 3601 if (PCM_RUNTIME_CHECK(substream)) 3602 return -ENXIO; 3603 3604 offset = area->vm_pgoff << PAGE_SHIFT; 3605 switch (offset) { 3606 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3607 if (pcm_file->no_compat_mmap) 3608 return -ENXIO; 3609 return snd_pcm_mmap_status(substream, file, area); 3610 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3611 if (pcm_file->no_compat_mmap) 3612 return -ENXIO; 3613 return snd_pcm_mmap_control(substream, file, area); 3614 default: 3615 return snd_pcm_mmap_data(substream, file, area); 3616 } 3617 return 0; 3618 } 3619 3620 static int snd_pcm_fasync(int fd, struct file * file, int on) 3621 { 3622 struct snd_pcm_file * pcm_file; 3623 struct snd_pcm_substream *substream; 3624 struct snd_pcm_runtime *runtime; 3625 3626 pcm_file = file->private_data; 3627 substream = pcm_file->substream; 3628 if (PCM_RUNTIME_CHECK(substream)) 3629 return -ENXIO; 3630 runtime = substream->runtime; 3631 return fasync_helper(fd, file, on, &runtime->fasync); 3632 } 3633 3634 /* 3635 * ioctl32 compat 3636 */ 3637 #ifdef CONFIG_COMPAT 3638 #include "pcm_compat.c" 3639 #else 3640 #define snd_pcm_ioctl_compat NULL 3641 #endif 3642 3643 /* 3644 * To be removed helpers to keep binary compatibility 3645 */ 3646 3647 #ifdef CONFIG_SND_SUPPORT_OLD_API 3648 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3649 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3650 3651 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3652 struct snd_pcm_hw_params_old *oparams) 3653 { 3654 unsigned int i; 3655 3656 memset(params, 0, sizeof(*params)); 3657 params->flags = oparams->flags; 3658 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3659 params->masks[i].bits[0] = oparams->masks[i]; 3660 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3661 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3662 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3663 params->info = oparams->info; 3664 params->msbits = oparams->msbits; 3665 params->rate_num = oparams->rate_num; 3666 params->rate_den = oparams->rate_den; 3667 params->fifo_size = oparams->fifo_size; 3668 } 3669 3670 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3671 struct snd_pcm_hw_params *params) 3672 { 3673 unsigned int i; 3674 3675 memset(oparams, 0, sizeof(*oparams)); 3676 oparams->flags = params->flags; 3677 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3678 oparams->masks[i] = params->masks[i].bits[0]; 3679 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3680 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3681 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3682 oparams->info = params->info; 3683 oparams->msbits = params->msbits; 3684 oparams->rate_num = params->rate_num; 3685 oparams->rate_den = params->rate_den; 3686 oparams->fifo_size = params->fifo_size; 3687 } 3688 3689 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3690 struct snd_pcm_hw_params_old __user * _oparams) 3691 { 3692 struct snd_pcm_hw_params *params; 3693 struct snd_pcm_hw_params_old *oparams = NULL; 3694 int err; 3695 3696 params = kmalloc(sizeof(*params), GFP_KERNEL); 3697 if (!params) 3698 return -ENOMEM; 3699 3700 oparams = memdup_user(_oparams, sizeof(*oparams)); 3701 if (IS_ERR(oparams)) { 3702 err = PTR_ERR(oparams); 3703 goto out; 3704 } 3705 snd_pcm_hw_convert_from_old_params(params, oparams); 3706 err = snd_pcm_hw_refine(substream, params); 3707 if (err < 0) 3708 goto out_old; 3709 3710 err = fixup_unreferenced_params(substream, params); 3711 if (err < 0) 3712 goto out_old; 3713 3714 snd_pcm_hw_convert_to_old_params(oparams, params); 3715 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3716 err = -EFAULT; 3717 out_old: 3718 kfree(oparams); 3719 out: 3720 kfree(params); 3721 return err; 3722 } 3723 3724 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3725 struct snd_pcm_hw_params_old __user * _oparams) 3726 { 3727 struct snd_pcm_hw_params *params; 3728 struct snd_pcm_hw_params_old *oparams = NULL; 3729 int err; 3730 3731 params = kmalloc(sizeof(*params), GFP_KERNEL); 3732 if (!params) 3733 return -ENOMEM; 3734 3735 oparams = memdup_user(_oparams, sizeof(*oparams)); 3736 if (IS_ERR(oparams)) { 3737 err = PTR_ERR(oparams); 3738 goto out; 3739 } 3740 3741 snd_pcm_hw_convert_from_old_params(params, oparams); 3742 err = snd_pcm_hw_params(substream, params); 3743 if (err < 0) 3744 goto out_old; 3745 3746 snd_pcm_hw_convert_to_old_params(oparams, params); 3747 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3748 err = -EFAULT; 3749 out_old: 3750 kfree(oparams); 3751 out: 3752 kfree(params); 3753 return err; 3754 } 3755 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3756 3757 #ifndef CONFIG_MMU 3758 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3759 unsigned long addr, 3760 unsigned long len, 3761 unsigned long pgoff, 3762 unsigned long flags) 3763 { 3764 struct snd_pcm_file *pcm_file = file->private_data; 3765 struct snd_pcm_substream *substream = pcm_file->substream; 3766 struct snd_pcm_runtime *runtime = substream->runtime; 3767 unsigned long offset = pgoff << PAGE_SHIFT; 3768 3769 switch (offset) { 3770 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3771 return (unsigned long)runtime->status; 3772 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3773 return (unsigned long)runtime->control; 3774 default: 3775 return (unsigned long)runtime->dma_area + offset; 3776 } 3777 } 3778 #else 3779 # define snd_pcm_get_unmapped_area NULL 3780 #endif 3781 3782 /* 3783 * Register section 3784 */ 3785 3786 const struct file_operations snd_pcm_f_ops[2] = { 3787 { 3788 .owner = THIS_MODULE, 3789 .write = snd_pcm_write, 3790 .write_iter = snd_pcm_writev, 3791 .open = snd_pcm_playback_open, 3792 .release = snd_pcm_release, 3793 .llseek = no_llseek, 3794 .poll = snd_pcm_playback_poll, 3795 .unlocked_ioctl = snd_pcm_playback_ioctl, 3796 .compat_ioctl = snd_pcm_ioctl_compat, 3797 .mmap = snd_pcm_mmap, 3798 .fasync = snd_pcm_fasync, 3799 .get_unmapped_area = snd_pcm_get_unmapped_area, 3800 }, 3801 { 3802 .owner = THIS_MODULE, 3803 .read = snd_pcm_read, 3804 .read_iter = snd_pcm_readv, 3805 .open = snd_pcm_capture_open, 3806 .release = snd_pcm_release, 3807 .llseek = no_llseek, 3808 .poll = snd_pcm_capture_poll, 3809 .unlocked_ioctl = snd_pcm_capture_ioctl, 3810 .compat_ioctl = snd_pcm_ioctl_compat, 3811 .mmap = snd_pcm_mmap, 3812 .fasync = snd_pcm_fasync, 3813 .get_unmapped_area = snd_pcm_get_unmapped_area, 3814 } 3815 }; 3816