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 *pcm = substream->pcm; 199 struct snd_pcm_str *pstr = substream->pstr; 200 201 memset(info, 0, sizeof(*info)); 202 info->card = pcm->card->number; 203 info->device = pcm->device; 204 info->stream = substream->stream; 205 info->subdevice = substream->number; 206 strlcpy(info->id, pcm->id, sizeof(info->id)); 207 strlcpy(info->name, pcm->name, sizeof(info->name)); 208 info->dev_class = pcm->dev_class; 209 info->dev_subclass = pcm->dev_subclass; 210 info->subdevices_count = pstr->substream_count; 211 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 212 strlcpy(info->subname, substream->name, sizeof(info->subname)); 213 214 return 0; 215 } 216 217 int snd_pcm_info_user(struct snd_pcm_substream *substream, 218 struct snd_pcm_info __user * _info) 219 { 220 struct snd_pcm_info *info; 221 int err; 222 223 info = kmalloc(sizeof(*info), GFP_KERNEL); 224 if (! info) 225 return -ENOMEM; 226 err = snd_pcm_info(substream, info); 227 if (err >= 0) { 228 if (copy_to_user(_info, info, sizeof(*info))) 229 err = -EFAULT; 230 } 231 kfree(info); 232 return err; 233 } 234 235 static bool hw_support_mmap(struct snd_pcm_substream *substream) 236 { 237 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 238 return false; 239 /* architecture supports dma_mmap_coherent()? */ 240 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA) 241 if (!substream->ops->mmap && 242 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 243 return false; 244 #endif 245 return true; 246 } 247 248 static int constrain_mask_params(struct snd_pcm_substream *substream, 249 struct snd_pcm_hw_params *params) 250 { 251 struct snd_pcm_hw_constraints *constrs = 252 &substream->runtime->hw_constraints; 253 struct snd_mask *m; 254 unsigned int k; 255 struct snd_mask old_mask; 256 int changed; 257 258 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 259 m = hw_param_mask(params, k); 260 if (snd_mask_empty(m)) 261 return -EINVAL; 262 263 /* This parameter is not requested to change by a caller. */ 264 if (!(params->rmask & (1 << k))) 265 continue; 266 267 if (trace_hw_mask_param_enabled()) 268 old_mask = *m; 269 270 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 271 if (changed < 0) 272 return changed; 273 if (changed == 0) 274 continue; 275 276 /* Set corresponding flag so that the caller gets it. */ 277 trace_hw_mask_param(substream, k, 0, &old_mask, m); 278 params->cmask |= 1 << k; 279 } 280 281 return 0; 282 } 283 284 static int constrain_interval_params(struct snd_pcm_substream *substream, 285 struct snd_pcm_hw_params *params) 286 { 287 struct snd_pcm_hw_constraints *constrs = 288 &substream->runtime->hw_constraints; 289 struct snd_interval *i; 290 unsigned int k; 291 struct snd_interval old_interval; 292 int changed; 293 294 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 295 i = hw_param_interval(params, k); 296 if (snd_interval_empty(i)) 297 return -EINVAL; 298 299 /* This parameter is not requested to change by a caller. */ 300 if (!(params->rmask & (1 << k))) 301 continue; 302 303 if (trace_hw_interval_param_enabled()) 304 old_interval = *i; 305 306 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 307 if (changed < 0) 308 return changed; 309 if (changed == 0) 310 continue; 311 312 /* Set corresponding flag so that the caller gets it. */ 313 trace_hw_interval_param(substream, k, 0, &old_interval, i); 314 params->cmask |= 1 << k; 315 } 316 317 return 0; 318 } 319 320 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 321 struct snd_pcm_hw_params *params) 322 { 323 struct snd_pcm_hw_constraints *constrs = 324 &substream->runtime->hw_constraints; 325 unsigned int k; 326 unsigned int rstamps[constrs->rules_num]; 327 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 328 unsigned int stamp; 329 struct snd_pcm_hw_rule *r; 330 unsigned int d; 331 struct snd_mask old_mask; 332 struct snd_interval old_interval; 333 bool again; 334 int changed; 335 336 /* 337 * Each application of rule has own sequence number. 338 * 339 * Each member of 'rstamps' array represents the sequence number of 340 * recent application of corresponding rule. 341 */ 342 for (k = 0; k < constrs->rules_num; k++) 343 rstamps[k] = 0; 344 345 /* 346 * Each member of 'vstamps' array represents the sequence number of 347 * recent application of rule in which corresponding parameters were 348 * changed. 349 * 350 * In initial state, elements corresponding to parameters requested by 351 * a caller is 1. For unrequested parameters, corresponding members 352 * have 0 so that the parameters are never changed anymore. 353 */ 354 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 355 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 356 357 /* Due to the above design, actual sequence number starts at 2. */ 358 stamp = 2; 359 retry: 360 /* Apply all rules in order. */ 361 again = false; 362 for (k = 0; k < constrs->rules_num; k++) { 363 r = &constrs->rules[k]; 364 365 /* 366 * Check condition bits of this rule. When the rule has 367 * some condition bits, parameter without the bits is 368 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 369 * is an example of the condition bits. 370 */ 371 if (r->cond && !(r->cond & params->flags)) 372 continue; 373 374 /* 375 * The 'deps' array includes maximum three dependencies 376 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 377 * member of this array is a sentinel and should be 378 * negative value. 379 * 380 * This rule should be processed in this time when dependent 381 * parameters were changed at former applications of the other 382 * rules. 383 */ 384 for (d = 0; r->deps[d] >= 0; d++) { 385 if (vstamps[r->deps[d]] > rstamps[k]) 386 break; 387 } 388 if (r->deps[d] < 0) 389 continue; 390 391 if (trace_hw_mask_param_enabled()) { 392 if (hw_is_mask(r->var)) 393 old_mask = *hw_param_mask(params, r->var); 394 } 395 if (trace_hw_interval_param_enabled()) { 396 if (hw_is_interval(r->var)) 397 old_interval = *hw_param_interval(params, r->var); 398 } 399 400 changed = r->func(params, r); 401 if (changed < 0) 402 return changed; 403 404 /* 405 * When the parameter is changed, notify it to the caller 406 * by corresponding returned bit, then preparing for next 407 * iteration. 408 */ 409 if (changed && r->var >= 0) { 410 if (hw_is_mask(r->var)) { 411 trace_hw_mask_param(substream, r->var, 412 k + 1, &old_mask, 413 hw_param_mask(params, r->var)); 414 } 415 if (hw_is_interval(r->var)) { 416 trace_hw_interval_param(substream, r->var, 417 k + 1, &old_interval, 418 hw_param_interval(params, r->var)); 419 } 420 421 params->cmask |= (1 << r->var); 422 vstamps[r->var] = stamp; 423 again = true; 424 } 425 426 rstamps[k] = stamp++; 427 } 428 429 /* Iterate to evaluate all rules till no parameters are changed. */ 430 if (again) 431 goto retry; 432 433 return 0; 434 } 435 436 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 437 struct snd_pcm_hw_params *params) 438 { 439 const struct snd_interval *i; 440 const struct snd_mask *m; 441 int err; 442 443 if (!params->msbits) { 444 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 445 if (snd_interval_single(i)) 446 params->msbits = snd_interval_value(i); 447 } 448 449 if (!params->rate_den) { 450 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 451 if (snd_interval_single(i)) { 452 params->rate_num = snd_interval_value(i); 453 params->rate_den = 1; 454 } 455 } 456 457 if (!params->fifo_size) { 458 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 459 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 460 if (snd_mask_single(m) && snd_interval_single(i)) { 461 err = substream->ops->ioctl(substream, 462 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 463 if (err < 0) 464 return err; 465 } 466 } 467 468 if (!params->info) { 469 params->info = substream->runtime->hw.info; 470 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 471 SNDRV_PCM_INFO_DRAIN_TRIGGER); 472 if (!hw_support_mmap(substream)) 473 params->info &= ~(SNDRV_PCM_INFO_MMAP | 474 SNDRV_PCM_INFO_MMAP_VALID); 475 } 476 477 return 0; 478 } 479 480 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 481 struct snd_pcm_hw_params *params) 482 { 483 int err; 484 485 params->info = 0; 486 params->fifo_size = 0; 487 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 488 params->msbits = 0; 489 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 490 params->rate_num = 0; 491 params->rate_den = 0; 492 } 493 494 err = constrain_mask_params(substream, params); 495 if (err < 0) 496 return err; 497 498 err = constrain_interval_params(substream, params); 499 if (err < 0) 500 return err; 501 502 err = constrain_params_by_rules(substream, params); 503 if (err < 0) 504 return err; 505 506 params->rmask = 0; 507 508 return 0; 509 } 510 EXPORT_SYMBOL(snd_pcm_hw_refine); 511 512 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 513 struct snd_pcm_hw_params __user * _params) 514 { 515 struct snd_pcm_hw_params *params; 516 int err; 517 518 params = memdup_user(_params, sizeof(*params)); 519 if (IS_ERR(params)) 520 return PTR_ERR(params); 521 522 err = snd_pcm_hw_refine(substream, params); 523 if (err < 0) 524 goto end; 525 526 err = fixup_unreferenced_params(substream, params); 527 if (err < 0) 528 goto end; 529 530 if (copy_to_user(_params, params, sizeof(*params))) 531 err = -EFAULT; 532 end: 533 kfree(params); 534 return err; 535 } 536 537 static int period_to_usecs(struct snd_pcm_runtime *runtime) 538 { 539 int usecs; 540 541 if (! runtime->rate) 542 return -1; /* invalid */ 543 544 /* take 75% of period time as the deadline */ 545 usecs = (750000 / runtime->rate) * runtime->period_size; 546 usecs += ((750000 % runtime->rate) * runtime->period_size) / 547 runtime->rate; 548 549 return usecs; 550 } 551 552 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 553 { 554 snd_pcm_stream_lock_irq(substream); 555 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 556 substream->runtime->status->state = state; 557 snd_pcm_stream_unlock_irq(substream); 558 } 559 560 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 561 int event) 562 { 563 #ifdef CONFIG_SND_PCM_TIMER 564 if (substream->timer) 565 snd_timer_notify(substream->timer, event, 566 &substream->runtime->trigger_tstamp); 567 #endif 568 } 569 570 /** 571 * snd_pcm_hw_param_choose - choose a configuration defined by @params 572 * @pcm: PCM instance 573 * @params: the hw_params instance 574 * 575 * Choose one configuration from configuration space defined by @params. 576 * The configuration chosen is that obtained fixing in this order: 577 * first access, first format, first subformat, min channels, 578 * min rate, min period time, max buffer size, min tick time 579 * 580 * Return: Zero if successful, or a negative error code on failure. 581 */ 582 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 583 struct snd_pcm_hw_params *params) 584 { 585 static const int vars[] = { 586 SNDRV_PCM_HW_PARAM_ACCESS, 587 SNDRV_PCM_HW_PARAM_FORMAT, 588 SNDRV_PCM_HW_PARAM_SUBFORMAT, 589 SNDRV_PCM_HW_PARAM_CHANNELS, 590 SNDRV_PCM_HW_PARAM_RATE, 591 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 592 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 593 SNDRV_PCM_HW_PARAM_TICK_TIME, 594 -1 595 }; 596 const int *v; 597 struct snd_mask old_mask; 598 struct snd_interval old_interval; 599 int changed; 600 601 for (v = vars; *v != -1; v++) { 602 /* Keep old parameter to trace. */ 603 if (trace_hw_mask_param_enabled()) { 604 if (hw_is_mask(*v)) 605 old_mask = *hw_param_mask(params, *v); 606 } 607 if (trace_hw_interval_param_enabled()) { 608 if (hw_is_interval(*v)) 609 old_interval = *hw_param_interval(params, *v); 610 } 611 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 612 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 613 else 614 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 615 if (snd_BUG_ON(changed < 0)) 616 return changed; 617 if (changed == 0) 618 continue; 619 620 /* Trace the changed parameter. */ 621 if (hw_is_mask(*v)) { 622 trace_hw_mask_param(pcm, *v, 0, &old_mask, 623 hw_param_mask(params, *v)); 624 } 625 if (hw_is_interval(*v)) { 626 trace_hw_interval_param(pcm, *v, 0, &old_interval, 627 hw_param_interval(params, *v)); 628 } 629 } 630 631 return 0; 632 } 633 634 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 635 struct snd_pcm_hw_params *params) 636 { 637 struct snd_pcm_runtime *runtime; 638 int err, usecs; 639 unsigned int bits; 640 snd_pcm_uframes_t frames; 641 642 if (PCM_RUNTIME_CHECK(substream)) 643 return -ENXIO; 644 runtime = substream->runtime; 645 snd_pcm_stream_lock_irq(substream); 646 switch (runtime->status->state) { 647 case SNDRV_PCM_STATE_OPEN: 648 case SNDRV_PCM_STATE_SETUP: 649 case SNDRV_PCM_STATE_PREPARED: 650 break; 651 default: 652 snd_pcm_stream_unlock_irq(substream); 653 return -EBADFD; 654 } 655 snd_pcm_stream_unlock_irq(substream); 656 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 657 if (!substream->oss.oss) 658 #endif 659 if (atomic_read(&substream->mmap_count)) 660 return -EBADFD; 661 662 params->rmask = ~0U; 663 err = snd_pcm_hw_refine(substream, params); 664 if (err < 0) 665 goto _error; 666 667 err = snd_pcm_hw_params_choose(substream, params); 668 if (err < 0) 669 goto _error; 670 671 err = fixup_unreferenced_params(substream, params); 672 if (err < 0) 673 goto _error; 674 675 if (substream->ops->hw_params != NULL) { 676 err = substream->ops->hw_params(substream, params); 677 if (err < 0) 678 goto _error; 679 } 680 681 runtime->access = params_access(params); 682 runtime->format = params_format(params); 683 runtime->subformat = params_subformat(params); 684 runtime->channels = params_channels(params); 685 runtime->rate = params_rate(params); 686 runtime->period_size = params_period_size(params); 687 runtime->periods = params_periods(params); 688 runtime->buffer_size = params_buffer_size(params); 689 runtime->info = params->info; 690 runtime->rate_num = params->rate_num; 691 runtime->rate_den = params->rate_den; 692 runtime->no_period_wakeup = 693 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 694 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 695 696 bits = snd_pcm_format_physical_width(runtime->format); 697 runtime->sample_bits = bits; 698 bits *= runtime->channels; 699 runtime->frame_bits = bits; 700 frames = 1; 701 while (bits % 8 != 0) { 702 bits *= 2; 703 frames *= 2; 704 } 705 runtime->byte_align = bits / 8; 706 runtime->min_align = frames; 707 708 /* Default sw params */ 709 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 710 runtime->period_step = 1; 711 runtime->control->avail_min = runtime->period_size; 712 runtime->start_threshold = 1; 713 runtime->stop_threshold = runtime->buffer_size; 714 runtime->silence_threshold = 0; 715 runtime->silence_size = 0; 716 runtime->boundary = runtime->buffer_size; 717 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 718 runtime->boundary *= 2; 719 720 snd_pcm_timer_resolution_change(substream); 721 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 722 723 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 724 pm_qos_remove_request(&substream->latency_pm_qos_req); 725 if ((usecs = period_to_usecs(runtime)) >= 0) 726 pm_qos_add_request(&substream->latency_pm_qos_req, 727 PM_QOS_CPU_DMA_LATENCY, usecs); 728 return 0; 729 _error: 730 /* hardware might be unusable from this time, 731 so we force application to retry to set 732 the correct hardware parameter settings */ 733 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 734 if (substream->ops->hw_free != NULL) 735 substream->ops->hw_free(substream); 736 return err; 737 } 738 739 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 740 struct snd_pcm_hw_params __user * _params) 741 { 742 struct snd_pcm_hw_params *params; 743 int err; 744 745 params = memdup_user(_params, sizeof(*params)); 746 if (IS_ERR(params)) 747 return PTR_ERR(params); 748 749 err = snd_pcm_hw_params(substream, params); 750 if (err < 0) 751 goto end; 752 753 if (copy_to_user(_params, params, sizeof(*params))) 754 err = -EFAULT; 755 end: 756 kfree(params); 757 return err; 758 } 759 760 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 761 { 762 struct snd_pcm_runtime *runtime; 763 int result = 0; 764 765 if (PCM_RUNTIME_CHECK(substream)) 766 return -ENXIO; 767 runtime = substream->runtime; 768 snd_pcm_stream_lock_irq(substream); 769 switch (runtime->status->state) { 770 case SNDRV_PCM_STATE_SETUP: 771 case SNDRV_PCM_STATE_PREPARED: 772 break; 773 default: 774 snd_pcm_stream_unlock_irq(substream); 775 return -EBADFD; 776 } 777 snd_pcm_stream_unlock_irq(substream); 778 if (atomic_read(&substream->mmap_count)) 779 return -EBADFD; 780 if (substream->ops->hw_free) 781 result = substream->ops->hw_free(substream); 782 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 783 pm_qos_remove_request(&substream->latency_pm_qos_req); 784 return result; 785 } 786 787 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 788 struct snd_pcm_sw_params *params) 789 { 790 struct snd_pcm_runtime *runtime; 791 int err; 792 793 if (PCM_RUNTIME_CHECK(substream)) 794 return -ENXIO; 795 runtime = substream->runtime; 796 snd_pcm_stream_lock_irq(substream); 797 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 798 snd_pcm_stream_unlock_irq(substream); 799 return -EBADFD; 800 } 801 snd_pcm_stream_unlock_irq(substream); 802 803 if (params->tstamp_mode < 0 || 804 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 805 return -EINVAL; 806 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 807 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 808 return -EINVAL; 809 if (params->avail_min == 0) 810 return -EINVAL; 811 if (params->silence_size >= runtime->boundary) { 812 if (params->silence_threshold != 0) 813 return -EINVAL; 814 } else { 815 if (params->silence_size > params->silence_threshold) 816 return -EINVAL; 817 if (params->silence_threshold > runtime->buffer_size) 818 return -EINVAL; 819 } 820 err = 0; 821 snd_pcm_stream_lock_irq(substream); 822 runtime->tstamp_mode = params->tstamp_mode; 823 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 824 runtime->tstamp_type = params->tstamp_type; 825 runtime->period_step = params->period_step; 826 runtime->control->avail_min = params->avail_min; 827 runtime->start_threshold = params->start_threshold; 828 runtime->stop_threshold = params->stop_threshold; 829 runtime->silence_threshold = params->silence_threshold; 830 runtime->silence_size = params->silence_size; 831 params->boundary = runtime->boundary; 832 if (snd_pcm_running(substream)) { 833 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 834 runtime->silence_size > 0) 835 snd_pcm_playback_silence(substream, ULONG_MAX); 836 err = snd_pcm_update_state(substream, runtime); 837 } 838 snd_pcm_stream_unlock_irq(substream); 839 return err; 840 } 841 842 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 843 struct snd_pcm_sw_params __user * _params) 844 { 845 struct snd_pcm_sw_params params; 846 int err; 847 if (copy_from_user(¶ms, _params, sizeof(params))) 848 return -EFAULT; 849 err = snd_pcm_sw_params(substream, ¶ms); 850 if (copy_to_user(_params, ¶ms, sizeof(params))) 851 return -EFAULT; 852 return err; 853 } 854 855 int snd_pcm_status(struct snd_pcm_substream *substream, 856 struct snd_pcm_status *status) 857 { 858 struct snd_pcm_runtime *runtime = substream->runtime; 859 860 snd_pcm_stream_lock_irq(substream); 861 862 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 863 &runtime->audio_tstamp_config); 864 865 /* backwards compatible behavior */ 866 if (runtime->audio_tstamp_config.type_requested == 867 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 868 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 869 runtime->audio_tstamp_config.type_requested = 870 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 871 else 872 runtime->audio_tstamp_config.type_requested = 873 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 874 runtime->audio_tstamp_report.valid = 0; 875 } else 876 runtime->audio_tstamp_report.valid = 1; 877 878 status->state = runtime->status->state; 879 status->suspended_state = runtime->status->suspended_state; 880 if (status->state == SNDRV_PCM_STATE_OPEN) 881 goto _end; 882 status->trigger_tstamp = runtime->trigger_tstamp; 883 if (snd_pcm_running(substream)) { 884 snd_pcm_update_hw_ptr(substream); 885 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 886 status->tstamp = runtime->status->tstamp; 887 status->driver_tstamp = runtime->driver_tstamp; 888 status->audio_tstamp = 889 runtime->status->audio_tstamp; 890 if (runtime->audio_tstamp_report.valid == 1) 891 /* backwards compatibility, no report provided in COMPAT mode */ 892 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 893 &status->audio_tstamp_accuracy, 894 &runtime->audio_tstamp_report); 895 896 goto _tstamp_end; 897 } 898 } else { 899 /* get tstamp only in fallback mode and only if enabled */ 900 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 901 snd_pcm_gettime(runtime, &status->tstamp); 902 } 903 _tstamp_end: 904 status->appl_ptr = runtime->control->appl_ptr; 905 status->hw_ptr = runtime->status->hw_ptr; 906 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 907 status->avail = snd_pcm_playback_avail(runtime); 908 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 909 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 910 status->delay = runtime->buffer_size - status->avail; 911 status->delay += runtime->delay; 912 } else 913 status->delay = 0; 914 } else { 915 status->avail = snd_pcm_capture_avail(runtime); 916 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 917 status->delay = status->avail + runtime->delay; 918 else 919 status->delay = 0; 920 } 921 status->avail_max = runtime->avail_max; 922 status->overrange = runtime->overrange; 923 runtime->avail_max = 0; 924 runtime->overrange = 0; 925 _end: 926 snd_pcm_stream_unlock_irq(substream); 927 return 0; 928 } 929 930 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 931 struct snd_pcm_status __user * _status, 932 bool ext) 933 { 934 struct snd_pcm_status status; 935 int res; 936 937 memset(&status, 0, sizeof(status)); 938 /* 939 * with extension, parameters are read/write, 940 * get audio_tstamp_data from user, 941 * ignore rest of status structure 942 */ 943 if (ext && get_user(status.audio_tstamp_data, 944 (u32 __user *)(&_status->audio_tstamp_data))) 945 return -EFAULT; 946 res = snd_pcm_status(substream, &status); 947 if (res < 0) 948 return res; 949 if (copy_to_user(_status, &status, sizeof(status))) 950 return -EFAULT; 951 return 0; 952 } 953 954 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 955 struct snd_pcm_channel_info * info) 956 { 957 struct snd_pcm_runtime *runtime; 958 unsigned int channel; 959 960 channel = info->channel; 961 runtime = substream->runtime; 962 snd_pcm_stream_lock_irq(substream); 963 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 964 snd_pcm_stream_unlock_irq(substream); 965 return -EBADFD; 966 } 967 snd_pcm_stream_unlock_irq(substream); 968 if (channel >= runtime->channels) 969 return -EINVAL; 970 memset(info, 0, sizeof(*info)); 971 info->channel = channel; 972 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 973 } 974 975 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 976 struct snd_pcm_channel_info __user * _info) 977 { 978 struct snd_pcm_channel_info info; 979 int res; 980 981 if (copy_from_user(&info, _info, sizeof(info))) 982 return -EFAULT; 983 res = snd_pcm_channel_info(substream, &info); 984 if (res < 0) 985 return res; 986 if (copy_to_user(_info, &info, sizeof(info))) 987 return -EFAULT; 988 return 0; 989 } 990 991 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 992 { 993 struct snd_pcm_runtime *runtime = substream->runtime; 994 if (runtime->trigger_master == NULL) 995 return; 996 if (runtime->trigger_master == substream) { 997 if (!runtime->trigger_tstamp_latched) 998 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 999 } else { 1000 snd_pcm_trigger_tstamp(runtime->trigger_master); 1001 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1002 } 1003 runtime->trigger_master = NULL; 1004 } 1005 1006 struct action_ops { 1007 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1008 int (*do_action)(struct snd_pcm_substream *substream, int state); 1009 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1010 void (*post_action)(struct snd_pcm_substream *substream, int state); 1011 }; 1012 1013 /* 1014 * this functions is core for handling of linked stream 1015 * Note: the stream state might be changed also on failure 1016 * Note2: call with calling stream lock + link lock 1017 */ 1018 static int snd_pcm_action_group(const struct action_ops *ops, 1019 struct snd_pcm_substream *substream, 1020 int state, int do_lock) 1021 { 1022 struct snd_pcm_substream *s = NULL; 1023 struct snd_pcm_substream *s1; 1024 int res = 0, depth = 1; 1025 1026 snd_pcm_group_for_each_entry(s, substream) { 1027 if (do_lock && s != substream) { 1028 if (s->pcm->nonatomic) 1029 mutex_lock_nested(&s->self_group.mutex, depth); 1030 else 1031 spin_lock_nested(&s->self_group.lock, depth); 1032 depth++; 1033 } 1034 res = ops->pre_action(s, state); 1035 if (res < 0) 1036 goto _unlock; 1037 } 1038 snd_pcm_group_for_each_entry(s, substream) { 1039 res = ops->do_action(s, state); 1040 if (res < 0) { 1041 if (ops->undo_action) { 1042 snd_pcm_group_for_each_entry(s1, substream) { 1043 if (s1 == s) /* failed stream */ 1044 break; 1045 ops->undo_action(s1, state); 1046 } 1047 } 1048 s = NULL; /* unlock all */ 1049 goto _unlock; 1050 } 1051 } 1052 snd_pcm_group_for_each_entry(s, substream) { 1053 ops->post_action(s, state); 1054 } 1055 _unlock: 1056 if (do_lock) { 1057 /* unlock streams */ 1058 snd_pcm_group_for_each_entry(s1, substream) { 1059 if (s1 != substream) { 1060 if (s1->pcm->nonatomic) 1061 mutex_unlock(&s1->self_group.mutex); 1062 else 1063 spin_unlock(&s1->self_group.lock); 1064 } 1065 if (s1 == s) /* end */ 1066 break; 1067 } 1068 } 1069 return res; 1070 } 1071 1072 /* 1073 * Note: call with stream lock 1074 */ 1075 static int snd_pcm_action_single(const struct action_ops *ops, 1076 struct snd_pcm_substream *substream, 1077 int state) 1078 { 1079 int res; 1080 1081 res = ops->pre_action(substream, state); 1082 if (res < 0) 1083 return res; 1084 res = ops->do_action(substream, state); 1085 if (res == 0) 1086 ops->post_action(substream, state); 1087 else if (ops->undo_action) 1088 ops->undo_action(substream, state); 1089 return res; 1090 } 1091 1092 /* 1093 * Note: call with stream lock 1094 */ 1095 static int snd_pcm_action(const struct action_ops *ops, 1096 struct snd_pcm_substream *substream, 1097 int state) 1098 { 1099 int res; 1100 1101 if (!snd_pcm_stream_linked(substream)) 1102 return snd_pcm_action_single(ops, substream, state); 1103 1104 if (substream->pcm->nonatomic) { 1105 if (!mutex_trylock(&substream->group->mutex)) { 1106 mutex_unlock(&substream->self_group.mutex); 1107 mutex_lock(&substream->group->mutex); 1108 mutex_lock(&substream->self_group.mutex); 1109 } 1110 res = snd_pcm_action_group(ops, substream, state, 1); 1111 mutex_unlock(&substream->group->mutex); 1112 } else { 1113 if (!spin_trylock(&substream->group->lock)) { 1114 spin_unlock(&substream->self_group.lock); 1115 spin_lock(&substream->group->lock); 1116 spin_lock(&substream->self_group.lock); 1117 } 1118 res = snd_pcm_action_group(ops, substream, state, 1); 1119 spin_unlock(&substream->group->lock); 1120 } 1121 return res; 1122 } 1123 1124 /* 1125 * Note: don't use any locks before 1126 */ 1127 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1128 struct snd_pcm_substream *substream, 1129 int state) 1130 { 1131 int res; 1132 1133 snd_pcm_stream_lock_irq(substream); 1134 res = snd_pcm_action(ops, substream, state); 1135 snd_pcm_stream_unlock_irq(substream); 1136 return res; 1137 } 1138 1139 /* 1140 */ 1141 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1142 struct snd_pcm_substream *substream, 1143 int state) 1144 { 1145 int res; 1146 1147 down_read(&snd_pcm_link_rwsem); 1148 if (snd_pcm_stream_linked(substream)) 1149 res = snd_pcm_action_group(ops, substream, state, 0); 1150 else 1151 res = snd_pcm_action_single(ops, substream, state); 1152 up_read(&snd_pcm_link_rwsem); 1153 return res; 1154 } 1155 1156 /* 1157 * start callbacks 1158 */ 1159 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1160 { 1161 struct snd_pcm_runtime *runtime = substream->runtime; 1162 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1163 return -EBADFD; 1164 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1165 !snd_pcm_playback_data(substream)) 1166 return -EPIPE; 1167 runtime->trigger_tstamp_latched = false; 1168 runtime->trigger_master = substream; 1169 return 0; 1170 } 1171 1172 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1173 { 1174 if (substream->runtime->trigger_master != substream) 1175 return 0; 1176 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1177 } 1178 1179 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1180 { 1181 if (substream->runtime->trigger_master == substream) 1182 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1183 } 1184 1185 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1186 { 1187 struct snd_pcm_runtime *runtime = substream->runtime; 1188 snd_pcm_trigger_tstamp(substream); 1189 runtime->hw_ptr_jiffies = jiffies; 1190 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1191 runtime->rate; 1192 runtime->status->state = state; 1193 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1194 runtime->silence_size > 0) 1195 snd_pcm_playback_silence(substream, ULONG_MAX); 1196 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1197 } 1198 1199 static const struct action_ops snd_pcm_action_start = { 1200 .pre_action = snd_pcm_pre_start, 1201 .do_action = snd_pcm_do_start, 1202 .undo_action = snd_pcm_undo_start, 1203 .post_action = snd_pcm_post_start 1204 }; 1205 1206 /** 1207 * snd_pcm_start - start all linked streams 1208 * @substream: the PCM substream instance 1209 * 1210 * Return: Zero if successful, or a negative error code. 1211 * The stream lock must be acquired before calling this function. 1212 */ 1213 int snd_pcm_start(struct snd_pcm_substream *substream) 1214 { 1215 return snd_pcm_action(&snd_pcm_action_start, substream, 1216 SNDRV_PCM_STATE_RUNNING); 1217 } 1218 1219 /* take the stream lock and start the streams */ 1220 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1221 { 1222 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1223 SNDRV_PCM_STATE_RUNNING); 1224 } 1225 1226 /* 1227 * stop callbacks 1228 */ 1229 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1230 { 1231 struct snd_pcm_runtime *runtime = substream->runtime; 1232 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1233 return -EBADFD; 1234 runtime->trigger_master = substream; 1235 return 0; 1236 } 1237 1238 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1239 { 1240 if (substream->runtime->trigger_master == substream && 1241 snd_pcm_running(substream)) 1242 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1243 return 0; /* unconditonally stop all substreams */ 1244 } 1245 1246 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1247 { 1248 struct snd_pcm_runtime *runtime = substream->runtime; 1249 if (runtime->status->state != state) { 1250 snd_pcm_trigger_tstamp(substream); 1251 runtime->status->state = state; 1252 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1253 } 1254 wake_up(&runtime->sleep); 1255 wake_up(&runtime->tsleep); 1256 } 1257 1258 static const struct action_ops snd_pcm_action_stop = { 1259 .pre_action = snd_pcm_pre_stop, 1260 .do_action = snd_pcm_do_stop, 1261 .post_action = snd_pcm_post_stop 1262 }; 1263 1264 /** 1265 * snd_pcm_stop - try to stop all running streams in the substream group 1266 * @substream: the PCM substream instance 1267 * @state: PCM state after stopping the stream 1268 * 1269 * The state of each stream is then changed to the given state unconditionally. 1270 * 1271 * Return: Zero if successful, or a negative error code. 1272 */ 1273 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1274 { 1275 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1276 } 1277 EXPORT_SYMBOL(snd_pcm_stop); 1278 1279 /** 1280 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1281 * @substream: the PCM substream 1282 * 1283 * After stopping, the state is changed to SETUP. 1284 * Unlike snd_pcm_stop(), this affects only the given stream. 1285 * 1286 * Return: Zero if succesful, or a negative error code. 1287 */ 1288 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1289 { 1290 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1291 SNDRV_PCM_STATE_SETUP); 1292 } 1293 1294 /** 1295 * snd_pcm_stop_xrun - stop the running streams as XRUN 1296 * @substream: the PCM substream instance 1297 * 1298 * This stops the given running substream (and all linked substreams) as XRUN. 1299 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1300 * 1301 * Return: Zero if successful, or a negative error code. 1302 */ 1303 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1304 { 1305 unsigned long flags; 1306 int ret = 0; 1307 1308 snd_pcm_stream_lock_irqsave(substream, flags); 1309 if (snd_pcm_running(substream)) 1310 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1311 snd_pcm_stream_unlock_irqrestore(substream, flags); 1312 return ret; 1313 } 1314 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1315 1316 /* 1317 * pause callbacks 1318 */ 1319 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1320 { 1321 struct snd_pcm_runtime *runtime = substream->runtime; 1322 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1323 return -ENOSYS; 1324 if (push) { 1325 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1326 return -EBADFD; 1327 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1328 return -EBADFD; 1329 runtime->trigger_master = substream; 1330 return 0; 1331 } 1332 1333 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1334 { 1335 if (substream->runtime->trigger_master != substream) 1336 return 0; 1337 /* some drivers might use hw_ptr to recover from the pause - 1338 update the hw_ptr now */ 1339 if (push) 1340 snd_pcm_update_hw_ptr(substream); 1341 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1342 * a delta between the current jiffies, this gives a large enough 1343 * delta, effectively to skip the check once. 1344 */ 1345 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1346 return substream->ops->trigger(substream, 1347 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1348 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1349 } 1350 1351 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1352 { 1353 if (substream->runtime->trigger_master == substream) 1354 substream->ops->trigger(substream, 1355 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1356 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1357 } 1358 1359 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1360 { 1361 struct snd_pcm_runtime *runtime = substream->runtime; 1362 snd_pcm_trigger_tstamp(substream); 1363 if (push) { 1364 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1365 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1366 wake_up(&runtime->sleep); 1367 wake_up(&runtime->tsleep); 1368 } else { 1369 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1370 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1371 } 1372 } 1373 1374 static const struct action_ops snd_pcm_action_pause = { 1375 .pre_action = snd_pcm_pre_pause, 1376 .do_action = snd_pcm_do_pause, 1377 .undo_action = snd_pcm_undo_pause, 1378 .post_action = snd_pcm_post_pause 1379 }; 1380 1381 /* 1382 * Push/release the pause for all linked streams. 1383 */ 1384 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1385 { 1386 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1387 } 1388 1389 #ifdef CONFIG_PM 1390 /* suspend */ 1391 1392 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1393 { 1394 struct snd_pcm_runtime *runtime = substream->runtime; 1395 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1396 return -EBUSY; 1397 runtime->trigger_master = substream; 1398 return 0; 1399 } 1400 1401 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1402 { 1403 struct snd_pcm_runtime *runtime = substream->runtime; 1404 if (runtime->trigger_master != substream) 1405 return 0; 1406 if (! snd_pcm_running(substream)) 1407 return 0; 1408 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1409 return 0; /* suspend unconditionally */ 1410 } 1411 1412 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1413 { 1414 struct snd_pcm_runtime *runtime = substream->runtime; 1415 snd_pcm_trigger_tstamp(substream); 1416 runtime->status->suspended_state = runtime->status->state; 1417 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1418 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1419 wake_up(&runtime->sleep); 1420 wake_up(&runtime->tsleep); 1421 } 1422 1423 static const struct action_ops snd_pcm_action_suspend = { 1424 .pre_action = snd_pcm_pre_suspend, 1425 .do_action = snd_pcm_do_suspend, 1426 .post_action = snd_pcm_post_suspend 1427 }; 1428 1429 /** 1430 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1431 * @substream: the PCM substream 1432 * 1433 * After this call, all streams are changed to SUSPENDED state. 1434 * 1435 * Return: Zero if successful (or @substream is %NULL), or a negative error 1436 * code. 1437 */ 1438 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1439 { 1440 int err; 1441 unsigned long flags; 1442 1443 if (! substream) 1444 return 0; 1445 1446 snd_pcm_stream_lock_irqsave(substream, flags); 1447 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1448 snd_pcm_stream_unlock_irqrestore(substream, flags); 1449 return err; 1450 } 1451 EXPORT_SYMBOL(snd_pcm_suspend); 1452 1453 /** 1454 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1455 * @pcm: the PCM instance 1456 * 1457 * After this call, all streams are changed to SUSPENDED state. 1458 * 1459 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1460 */ 1461 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1462 { 1463 struct snd_pcm_substream *substream; 1464 int stream, err = 0; 1465 1466 if (! pcm) 1467 return 0; 1468 1469 for (stream = 0; stream < 2; stream++) { 1470 for (substream = pcm->streams[stream].substream; 1471 substream; substream = substream->next) { 1472 /* FIXME: the open/close code should lock this as well */ 1473 if (substream->runtime == NULL) 1474 continue; 1475 err = snd_pcm_suspend(substream); 1476 if (err < 0 && err != -EBUSY) 1477 return err; 1478 } 1479 } 1480 return 0; 1481 } 1482 EXPORT_SYMBOL(snd_pcm_suspend_all); 1483 1484 /* resume */ 1485 1486 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1487 { 1488 struct snd_pcm_runtime *runtime = substream->runtime; 1489 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1490 return -ENOSYS; 1491 runtime->trigger_master = substream; 1492 return 0; 1493 } 1494 1495 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1496 { 1497 struct snd_pcm_runtime *runtime = substream->runtime; 1498 if (runtime->trigger_master != substream) 1499 return 0; 1500 /* DMA not running previously? */ 1501 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1502 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1503 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1504 return 0; 1505 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1506 } 1507 1508 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1509 { 1510 if (substream->runtime->trigger_master == substream && 1511 snd_pcm_running(substream)) 1512 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1513 } 1514 1515 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1516 { 1517 struct snd_pcm_runtime *runtime = substream->runtime; 1518 snd_pcm_trigger_tstamp(substream); 1519 runtime->status->state = runtime->status->suspended_state; 1520 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1521 } 1522 1523 static const struct action_ops snd_pcm_action_resume = { 1524 .pre_action = snd_pcm_pre_resume, 1525 .do_action = snd_pcm_do_resume, 1526 .undo_action = snd_pcm_undo_resume, 1527 .post_action = snd_pcm_post_resume 1528 }; 1529 1530 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1531 { 1532 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1533 } 1534 1535 #else 1536 1537 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1538 { 1539 return -ENOSYS; 1540 } 1541 1542 #endif /* CONFIG_PM */ 1543 1544 /* 1545 * xrun ioctl 1546 * 1547 * Change the RUNNING stream(s) to XRUN state. 1548 */ 1549 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1550 { 1551 struct snd_pcm_runtime *runtime = substream->runtime; 1552 int result; 1553 1554 snd_pcm_stream_lock_irq(substream); 1555 switch (runtime->status->state) { 1556 case SNDRV_PCM_STATE_XRUN: 1557 result = 0; /* already there */ 1558 break; 1559 case SNDRV_PCM_STATE_RUNNING: 1560 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1561 break; 1562 default: 1563 result = -EBADFD; 1564 } 1565 snd_pcm_stream_unlock_irq(substream); 1566 return result; 1567 } 1568 1569 /* 1570 * reset ioctl 1571 */ 1572 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1573 { 1574 struct snd_pcm_runtime *runtime = substream->runtime; 1575 switch (runtime->status->state) { 1576 case SNDRV_PCM_STATE_RUNNING: 1577 case SNDRV_PCM_STATE_PREPARED: 1578 case SNDRV_PCM_STATE_PAUSED: 1579 case SNDRV_PCM_STATE_SUSPENDED: 1580 return 0; 1581 default: 1582 return -EBADFD; 1583 } 1584 } 1585 1586 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1587 { 1588 struct snd_pcm_runtime *runtime = substream->runtime; 1589 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1590 if (err < 0) 1591 return err; 1592 runtime->hw_ptr_base = 0; 1593 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1594 runtime->status->hw_ptr % runtime->period_size; 1595 runtime->silence_start = runtime->status->hw_ptr; 1596 runtime->silence_filled = 0; 1597 return 0; 1598 } 1599 1600 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1601 { 1602 struct snd_pcm_runtime *runtime = substream->runtime; 1603 runtime->control->appl_ptr = runtime->status->hw_ptr; 1604 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1605 runtime->silence_size > 0) 1606 snd_pcm_playback_silence(substream, ULONG_MAX); 1607 } 1608 1609 static const struct action_ops snd_pcm_action_reset = { 1610 .pre_action = snd_pcm_pre_reset, 1611 .do_action = snd_pcm_do_reset, 1612 .post_action = snd_pcm_post_reset 1613 }; 1614 1615 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1616 { 1617 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1618 } 1619 1620 /* 1621 * prepare ioctl 1622 */ 1623 /* we use the second argument for updating f_flags */ 1624 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1625 int f_flags) 1626 { 1627 struct snd_pcm_runtime *runtime = substream->runtime; 1628 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1629 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1630 return -EBADFD; 1631 if (snd_pcm_running(substream)) 1632 return -EBUSY; 1633 substream->f_flags = f_flags; 1634 return 0; 1635 } 1636 1637 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1638 { 1639 int err; 1640 err = substream->ops->prepare(substream); 1641 if (err < 0) 1642 return err; 1643 return snd_pcm_do_reset(substream, 0); 1644 } 1645 1646 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1647 { 1648 struct snd_pcm_runtime *runtime = substream->runtime; 1649 runtime->control->appl_ptr = runtime->status->hw_ptr; 1650 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1651 } 1652 1653 static const struct action_ops snd_pcm_action_prepare = { 1654 .pre_action = snd_pcm_pre_prepare, 1655 .do_action = snd_pcm_do_prepare, 1656 .post_action = snd_pcm_post_prepare 1657 }; 1658 1659 /** 1660 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1661 * @substream: the PCM substream instance 1662 * @file: file to refer f_flags 1663 * 1664 * Return: Zero if successful, or a negative error code. 1665 */ 1666 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1667 struct file *file) 1668 { 1669 int f_flags; 1670 1671 if (file) 1672 f_flags = file->f_flags; 1673 else 1674 f_flags = substream->f_flags; 1675 1676 snd_pcm_stream_lock_irq(substream); 1677 switch (substream->runtime->status->state) { 1678 case SNDRV_PCM_STATE_PAUSED: 1679 snd_pcm_pause(substream, 0); 1680 /* fallthru */ 1681 case SNDRV_PCM_STATE_SUSPENDED: 1682 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1683 break; 1684 } 1685 snd_pcm_stream_unlock_irq(substream); 1686 1687 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1688 substream, f_flags); 1689 } 1690 1691 /* 1692 * drain ioctl 1693 */ 1694 1695 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1696 { 1697 struct snd_pcm_runtime *runtime = substream->runtime; 1698 switch (runtime->status->state) { 1699 case SNDRV_PCM_STATE_OPEN: 1700 case SNDRV_PCM_STATE_DISCONNECTED: 1701 case SNDRV_PCM_STATE_SUSPENDED: 1702 return -EBADFD; 1703 } 1704 runtime->trigger_master = substream; 1705 return 0; 1706 } 1707 1708 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1709 { 1710 struct snd_pcm_runtime *runtime = substream->runtime; 1711 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1712 switch (runtime->status->state) { 1713 case SNDRV_PCM_STATE_PREPARED: 1714 /* start playback stream if possible */ 1715 if (! snd_pcm_playback_empty(substream)) { 1716 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1717 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1718 } else { 1719 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1720 } 1721 break; 1722 case SNDRV_PCM_STATE_RUNNING: 1723 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1724 break; 1725 case SNDRV_PCM_STATE_XRUN: 1726 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1727 break; 1728 default: 1729 break; 1730 } 1731 } else { 1732 /* stop running stream */ 1733 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1734 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1735 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1736 snd_pcm_do_stop(substream, new_state); 1737 snd_pcm_post_stop(substream, new_state); 1738 } 1739 } 1740 1741 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1742 runtime->trigger_master == substream && 1743 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1744 return substream->ops->trigger(substream, 1745 SNDRV_PCM_TRIGGER_DRAIN); 1746 1747 return 0; 1748 } 1749 1750 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1751 { 1752 } 1753 1754 static const struct action_ops snd_pcm_action_drain_init = { 1755 .pre_action = snd_pcm_pre_drain_init, 1756 .do_action = snd_pcm_do_drain_init, 1757 .post_action = snd_pcm_post_drain_init 1758 }; 1759 1760 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1761 1762 /* 1763 * Drain the stream(s). 1764 * When the substream is linked, sync until the draining of all playback streams 1765 * is finished. 1766 * After this call, all streams are supposed to be either SETUP or DRAINING 1767 * (capture only) state. 1768 */ 1769 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1770 struct file *file) 1771 { 1772 struct snd_card *card; 1773 struct snd_pcm_runtime *runtime; 1774 struct snd_pcm_substream *s; 1775 wait_queue_entry_t wait; 1776 int result = 0; 1777 int nonblock = 0; 1778 1779 card = substream->pcm->card; 1780 runtime = substream->runtime; 1781 1782 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1783 return -EBADFD; 1784 1785 if (file) { 1786 if (file->f_flags & O_NONBLOCK) 1787 nonblock = 1; 1788 } else if (substream->f_flags & O_NONBLOCK) 1789 nonblock = 1; 1790 1791 down_read(&snd_pcm_link_rwsem); 1792 snd_pcm_stream_lock_irq(substream); 1793 /* resume pause */ 1794 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1795 snd_pcm_pause(substream, 0); 1796 1797 /* pre-start/stop - all running streams are changed to DRAINING state */ 1798 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1799 if (result < 0) 1800 goto unlock; 1801 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1802 if (nonblock) { 1803 result = -EAGAIN; 1804 goto unlock; 1805 } 1806 1807 for (;;) { 1808 long tout; 1809 struct snd_pcm_runtime *to_check; 1810 if (signal_pending(current)) { 1811 result = -ERESTARTSYS; 1812 break; 1813 } 1814 /* find a substream to drain */ 1815 to_check = NULL; 1816 snd_pcm_group_for_each_entry(s, substream) { 1817 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1818 continue; 1819 runtime = s->runtime; 1820 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1821 to_check = runtime; 1822 break; 1823 } 1824 } 1825 if (!to_check) 1826 break; /* all drained */ 1827 init_waitqueue_entry(&wait, current); 1828 add_wait_queue(&to_check->sleep, &wait); 1829 snd_pcm_stream_unlock_irq(substream); 1830 up_read(&snd_pcm_link_rwsem); 1831 if (runtime->no_period_wakeup) 1832 tout = MAX_SCHEDULE_TIMEOUT; 1833 else { 1834 tout = 10; 1835 if (runtime->rate) { 1836 long t = runtime->period_size * 2 / runtime->rate; 1837 tout = max(t, tout); 1838 } 1839 tout = msecs_to_jiffies(tout * 1000); 1840 } 1841 tout = schedule_timeout_interruptible(tout); 1842 down_read(&snd_pcm_link_rwsem); 1843 snd_pcm_stream_lock_irq(substream); 1844 remove_wait_queue(&to_check->sleep, &wait); 1845 if (card->shutdown) { 1846 result = -ENODEV; 1847 break; 1848 } 1849 if (tout == 0) { 1850 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1851 result = -ESTRPIPE; 1852 else { 1853 dev_dbg(substream->pcm->card->dev, 1854 "playback drain error (DMA or IRQ trouble?)\n"); 1855 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1856 result = -EIO; 1857 } 1858 break; 1859 } 1860 } 1861 1862 unlock: 1863 snd_pcm_stream_unlock_irq(substream); 1864 up_read(&snd_pcm_link_rwsem); 1865 1866 return result; 1867 } 1868 1869 /* 1870 * drop ioctl 1871 * 1872 * Immediately put all linked substreams into SETUP state. 1873 */ 1874 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1875 { 1876 struct snd_pcm_runtime *runtime; 1877 int result = 0; 1878 1879 if (PCM_RUNTIME_CHECK(substream)) 1880 return -ENXIO; 1881 runtime = substream->runtime; 1882 1883 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1884 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1885 return -EBADFD; 1886 1887 snd_pcm_stream_lock_irq(substream); 1888 /* resume pause */ 1889 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1890 snd_pcm_pause(substream, 0); 1891 1892 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1893 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1894 snd_pcm_stream_unlock_irq(substream); 1895 1896 return result; 1897 } 1898 1899 1900 static bool is_pcm_file(struct file *file) 1901 { 1902 struct inode *inode = file_inode(file); 1903 unsigned int minor; 1904 1905 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1906 return false; 1907 minor = iminor(inode); 1908 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1909 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1910 } 1911 1912 /* 1913 * PCM link handling 1914 */ 1915 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1916 { 1917 int res = 0; 1918 struct snd_pcm_file *pcm_file; 1919 struct snd_pcm_substream *substream1; 1920 struct snd_pcm_group *group; 1921 struct fd f = fdget(fd); 1922 1923 if (!f.file) 1924 return -EBADFD; 1925 if (!is_pcm_file(f.file)) { 1926 res = -EBADFD; 1927 goto _badf; 1928 } 1929 pcm_file = f.file->private_data; 1930 substream1 = pcm_file->substream; 1931 group = kmalloc(sizeof(*group), GFP_KERNEL); 1932 if (!group) { 1933 res = -ENOMEM; 1934 goto _nolock; 1935 } 1936 down_write_nonblock(&snd_pcm_link_rwsem); 1937 write_lock_irq(&snd_pcm_link_rwlock); 1938 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1939 substream->runtime->status->state != substream1->runtime->status->state || 1940 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1941 res = -EBADFD; 1942 goto _end; 1943 } 1944 if (snd_pcm_stream_linked(substream1)) { 1945 res = -EALREADY; 1946 goto _end; 1947 } 1948 if (!snd_pcm_stream_linked(substream)) { 1949 substream->group = group; 1950 group = NULL; 1951 spin_lock_init(&substream->group->lock); 1952 mutex_init(&substream->group->mutex); 1953 INIT_LIST_HEAD(&substream->group->substreams); 1954 list_add_tail(&substream->link_list, &substream->group->substreams); 1955 substream->group->count = 1; 1956 } 1957 list_add_tail(&substream1->link_list, &substream->group->substreams); 1958 substream->group->count++; 1959 substream1->group = substream->group; 1960 _end: 1961 write_unlock_irq(&snd_pcm_link_rwlock); 1962 up_write(&snd_pcm_link_rwsem); 1963 _nolock: 1964 snd_card_unref(substream1->pcm->card); 1965 kfree(group); 1966 _badf: 1967 fdput(f); 1968 return res; 1969 } 1970 1971 static void relink_to_local(struct snd_pcm_substream *substream) 1972 { 1973 substream->group = &substream->self_group; 1974 INIT_LIST_HEAD(&substream->self_group.substreams); 1975 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1976 } 1977 1978 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1979 { 1980 struct snd_pcm_substream *s; 1981 int res = 0; 1982 1983 down_write_nonblock(&snd_pcm_link_rwsem); 1984 write_lock_irq(&snd_pcm_link_rwlock); 1985 if (!snd_pcm_stream_linked(substream)) { 1986 res = -EALREADY; 1987 goto _end; 1988 } 1989 list_del(&substream->link_list); 1990 substream->group->count--; 1991 if (substream->group->count == 1) { /* detach the last stream, too */ 1992 snd_pcm_group_for_each_entry(s, substream) { 1993 relink_to_local(s); 1994 break; 1995 } 1996 kfree(substream->group); 1997 } 1998 relink_to_local(substream); 1999 _end: 2000 write_unlock_irq(&snd_pcm_link_rwlock); 2001 up_write(&snd_pcm_link_rwsem); 2002 return res; 2003 } 2004 2005 /* 2006 * hw configurator 2007 */ 2008 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2009 struct snd_pcm_hw_rule *rule) 2010 { 2011 struct snd_interval t; 2012 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2013 hw_param_interval_c(params, rule->deps[1]), &t); 2014 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2015 } 2016 2017 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2018 struct snd_pcm_hw_rule *rule) 2019 { 2020 struct snd_interval t; 2021 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2022 hw_param_interval_c(params, rule->deps[1]), &t); 2023 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2024 } 2025 2026 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2027 struct snd_pcm_hw_rule *rule) 2028 { 2029 struct snd_interval t; 2030 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2031 hw_param_interval_c(params, rule->deps[1]), 2032 (unsigned long) rule->private, &t); 2033 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2034 } 2035 2036 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2037 struct snd_pcm_hw_rule *rule) 2038 { 2039 struct snd_interval t; 2040 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2041 (unsigned long) rule->private, 2042 hw_param_interval_c(params, rule->deps[1]), &t); 2043 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2044 } 2045 2046 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2047 struct snd_pcm_hw_rule *rule) 2048 { 2049 unsigned int k; 2050 const struct snd_interval *i = 2051 hw_param_interval_c(params, rule->deps[0]); 2052 struct snd_mask m; 2053 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2054 snd_mask_any(&m); 2055 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2056 int bits; 2057 if (! snd_mask_test(mask, k)) 2058 continue; 2059 bits = snd_pcm_format_physical_width(k); 2060 if (bits <= 0) 2061 continue; /* ignore invalid formats */ 2062 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2063 snd_mask_reset(&m, k); 2064 } 2065 return snd_mask_refine(mask, &m); 2066 } 2067 2068 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2069 struct snd_pcm_hw_rule *rule) 2070 { 2071 struct snd_interval t; 2072 unsigned int k; 2073 t.min = UINT_MAX; 2074 t.max = 0; 2075 t.openmin = 0; 2076 t.openmax = 0; 2077 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2078 int bits; 2079 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2080 continue; 2081 bits = snd_pcm_format_physical_width(k); 2082 if (bits <= 0) 2083 continue; /* ignore invalid formats */ 2084 if (t.min > (unsigned)bits) 2085 t.min = bits; 2086 if (t.max < (unsigned)bits) 2087 t.max = bits; 2088 } 2089 t.integer = 1; 2090 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2091 } 2092 2093 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2094 #error "Change this table" 2095 #endif 2096 2097 static const unsigned int rates[] = { 2098 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2099 48000, 64000, 88200, 96000, 176400, 192000 2100 }; 2101 2102 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2103 .count = ARRAY_SIZE(rates), 2104 .list = rates, 2105 }; 2106 2107 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2108 struct snd_pcm_hw_rule *rule) 2109 { 2110 struct snd_pcm_hardware *hw = rule->private; 2111 return snd_interval_list(hw_param_interval(params, rule->var), 2112 snd_pcm_known_rates.count, 2113 snd_pcm_known_rates.list, hw->rates); 2114 } 2115 2116 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2117 struct snd_pcm_hw_rule *rule) 2118 { 2119 struct snd_interval t; 2120 struct snd_pcm_substream *substream = rule->private; 2121 t.min = 0; 2122 t.max = substream->buffer_bytes_max; 2123 t.openmin = 0; 2124 t.openmax = 0; 2125 t.integer = 1; 2126 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2127 } 2128 2129 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2130 { 2131 struct snd_pcm_runtime *runtime = substream->runtime; 2132 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2133 int k, err; 2134 2135 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2136 snd_mask_any(constrs_mask(constrs, k)); 2137 } 2138 2139 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2140 snd_interval_any(constrs_interval(constrs, k)); 2141 } 2142 2143 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2144 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2145 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2146 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2147 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2148 2149 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2150 snd_pcm_hw_rule_format, NULL, 2151 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2152 if (err < 0) 2153 return err; 2154 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2155 snd_pcm_hw_rule_sample_bits, NULL, 2156 SNDRV_PCM_HW_PARAM_FORMAT, 2157 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2158 if (err < 0) 2159 return err; 2160 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2161 snd_pcm_hw_rule_div, NULL, 2162 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2163 if (err < 0) 2164 return err; 2165 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2166 snd_pcm_hw_rule_mul, NULL, 2167 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2168 if (err < 0) 2169 return err; 2170 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2171 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2172 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2173 if (err < 0) 2174 return err; 2175 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2176 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2177 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2178 if (err < 0) 2179 return err; 2180 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2181 snd_pcm_hw_rule_div, NULL, 2182 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2183 if (err < 0) 2184 return err; 2185 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2186 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2187 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2188 if (err < 0) 2189 return err; 2190 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2191 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2192 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2193 if (err < 0) 2194 return err; 2195 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2196 snd_pcm_hw_rule_div, NULL, 2197 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2198 if (err < 0) 2199 return err; 2200 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2201 snd_pcm_hw_rule_div, NULL, 2202 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2203 if (err < 0) 2204 return err; 2205 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2206 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2207 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2208 if (err < 0) 2209 return err; 2210 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2211 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2212 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2213 if (err < 0) 2214 return err; 2215 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2216 snd_pcm_hw_rule_mul, NULL, 2217 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2218 if (err < 0) 2219 return err; 2220 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2221 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2222 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2223 if (err < 0) 2224 return err; 2225 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2226 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2227 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2228 if (err < 0) 2229 return err; 2230 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2231 snd_pcm_hw_rule_muldivk, (void*) 8, 2232 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2233 if (err < 0) 2234 return err; 2235 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2236 snd_pcm_hw_rule_muldivk, (void*) 8, 2237 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2238 if (err < 0) 2239 return err; 2240 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2241 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2242 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2243 if (err < 0) 2244 return err; 2245 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2246 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2247 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2248 if (err < 0) 2249 return err; 2250 return 0; 2251 } 2252 2253 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2254 { 2255 struct snd_pcm_runtime *runtime = substream->runtime; 2256 struct snd_pcm_hardware *hw = &runtime->hw; 2257 int err; 2258 unsigned int mask = 0; 2259 2260 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2261 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2262 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2263 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2264 if (hw_support_mmap(substream)) { 2265 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2266 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2267 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2268 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2269 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2270 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2271 } 2272 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2273 if (err < 0) 2274 return err; 2275 2276 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2277 if (err < 0) 2278 return err; 2279 2280 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2281 if (err < 0) 2282 return err; 2283 2284 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2285 hw->channels_min, hw->channels_max); 2286 if (err < 0) 2287 return err; 2288 2289 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2290 hw->rate_min, hw->rate_max); 2291 if (err < 0) 2292 return err; 2293 2294 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2295 hw->period_bytes_min, hw->period_bytes_max); 2296 if (err < 0) 2297 return err; 2298 2299 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2300 hw->periods_min, hw->periods_max); 2301 if (err < 0) 2302 return err; 2303 2304 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2305 hw->period_bytes_min, hw->buffer_bytes_max); 2306 if (err < 0) 2307 return err; 2308 2309 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2310 snd_pcm_hw_rule_buffer_bytes_max, substream, 2311 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2312 if (err < 0) 2313 return err; 2314 2315 /* FIXME: remove */ 2316 if (runtime->dma_bytes) { 2317 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2318 if (err < 0) 2319 return err; 2320 } 2321 2322 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2323 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2324 snd_pcm_hw_rule_rate, hw, 2325 SNDRV_PCM_HW_PARAM_RATE, -1); 2326 if (err < 0) 2327 return err; 2328 } 2329 2330 /* FIXME: this belong to lowlevel */ 2331 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2332 2333 return 0; 2334 } 2335 2336 static void pcm_release_private(struct snd_pcm_substream *substream) 2337 { 2338 snd_pcm_unlink(substream); 2339 } 2340 2341 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2342 { 2343 substream->ref_count--; 2344 if (substream->ref_count > 0) 2345 return; 2346 2347 snd_pcm_drop(substream); 2348 if (substream->hw_opened) { 2349 if (substream->ops->hw_free && 2350 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2351 substream->ops->hw_free(substream); 2352 substream->ops->close(substream); 2353 substream->hw_opened = 0; 2354 } 2355 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2356 pm_qos_remove_request(&substream->latency_pm_qos_req); 2357 if (substream->pcm_release) { 2358 substream->pcm_release(substream); 2359 substream->pcm_release = NULL; 2360 } 2361 snd_pcm_detach_substream(substream); 2362 } 2363 EXPORT_SYMBOL(snd_pcm_release_substream); 2364 2365 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2366 struct file *file, 2367 struct snd_pcm_substream **rsubstream) 2368 { 2369 struct snd_pcm_substream *substream; 2370 int err; 2371 2372 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2373 if (err < 0) 2374 return err; 2375 if (substream->ref_count > 1) { 2376 *rsubstream = substream; 2377 return 0; 2378 } 2379 2380 err = snd_pcm_hw_constraints_init(substream); 2381 if (err < 0) { 2382 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2383 goto error; 2384 } 2385 2386 if ((err = substream->ops->open(substream)) < 0) 2387 goto error; 2388 2389 substream->hw_opened = 1; 2390 2391 err = snd_pcm_hw_constraints_complete(substream); 2392 if (err < 0) { 2393 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2394 goto error; 2395 } 2396 2397 *rsubstream = substream; 2398 return 0; 2399 2400 error: 2401 snd_pcm_release_substream(substream); 2402 return err; 2403 } 2404 EXPORT_SYMBOL(snd_pcm_open_substream); 2405 2406 static int snd_pcm_open_file(struct file *file, 2407 struct snd_pcm *pcm, 2408 int stream) 2409 { 2410 struct snd_pcm_file *pcm_file; 2411 struct snd_pcm_substream *substream; 2412 int err; 2413 2414 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2415 if (err < 0) 2416 return err; 2417 2418 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2419 if (pcm_file == NULL) { 2420 snd_pcm_release_substream(substream); 2421 return -ENOMEM; 2422 } 2423 pcm_file->substream = substream; 2424 if (substream->ref_count == 1) { 2425 substream->file = pcm_file; 2426 substream->pcm_release = pcm_release_private; 2427 } 2428 file->private_data = pcm_file; 2429 2430 return 0; 2431 } 2432 2433 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2434 { 2435 struct snd_pcm *pcm; 2436 int err = nonseekable_open(inode, file); 2437 if (err < 0) 2438 return err; 2439 pcm = snd_lookup_minor_data(iminor(inode), 2440 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2441 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2442 if (pcm) 2443 snd_card_unref(pcm->card); 2444 return err; 2445 } 2446 2447 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2448 { 2449 struct snd_pcm *pcm; 2450 int err = nonseekable_open(inode, file); 2451 if (err < 0) 2452 return err; 2453 pcm = snd_lookup_minor_data(iminor(inode), 2454 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2455 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2456 if (pcm) 2457 snd_card_unref(pcm->card); 2458 return err; 2459 } 2460 2461 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2462 { 2463 int err; 2464 wait_queue_entry_t wait; 2465 2466 if (pcm == NULL) { 2467 err = -ENODEV; 2468 goto __error1; 2469 } 2470 err = snd_card_file_add(pcm->card, file); 2471 if (err < 0) 2472 goto __error1; 2473 if (!try_module_get(pcm->card->module)) { 2474 err = -EFAULT; 2475 goto __error2; 2476 } 2477 init_waitqueue_entry(&wait, current); 2478 add_wait_queue(&pcm->open_wait, &wait); 2479 mutex_lock(&pcm->open_mutex); 2480 while (1) { 2481 err = snd_pcm_open_file(file, pcm, stream); 2482 if (err >= 0) 2483 break; 2484 if (err == -EAGAIN) { 2485 if (file->f_flags & O_NONBLOCK) { 2486 err = -EBUSY; 2487 break; 2488 } 2489 } else 2490 break; 2491 set_current_state(TASK_INTERRUPTIBLE); 2492 mutex_unlock(&pcm->open_mutex); 2493 schedule(); 2494 mutex_lock(&pcm->open_mutex); 2495 if (pcm->card->shutdown) { 2496 err = -ENODEV; 2497 break; 2498 } 2499 if (signal_pending(current)) { 2500 err = -ERESTARTSYS; 2501 break; 2502 } 2503 } 2504 remove_wait_queue(&pcm->open_wait, &wait); 2505 mutex_unlock(&pcm->open_mutex); 2506 if (err < 0) 2507 goto __error; 2508 return err; 2509 2510 __error: 2511 module_put(pcm->card->module); 2512 __error2: 2513 snd_card_file_remove(pcm->card, file); 2514 __error1: 2515 return err; 2516 } 2517 2518 static int snd_pcm_release(struct inode *inode, struct file *file) 2519 { 2520 struct snd_pcm *pcm; 2521 struct snd_pcm_substream *substream; 2522 struct snd_pcm_file *pcm_file; 2523 2524 pcm_file = file->private_data; 2525 substream = pcm_file->substream; 2526 if (snd_BUG_ON(!substream)) 2527 return -ENXIO; 2528 pcm = substream->pcm; 2529 mutex_lock(&pcm->open_mutex); 2530 snd_pcm_release_substream(substream); 2531 kfree(pcm_file); 2532 mutex_unlock(&pcm->open_mutex); 2533 wake_up(&pcm->open_wait); 2534 module_put(pcm->card->module); 2535 snd_card_file_remove(pcm->card, file); 2536 return 0; 2537 } 2538 2539 /* check and update PCM state; return 0 or a negative error 2540 * call this inside PCM lock 2541 */ 2542 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2543 { 2544 switch (substream->runtime->status->state) { 2545 case SNDRV_PCM_STATE_DRAINING: 2546 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2547 return -EBADFD; 2548 /* Fall through */ 2549 case SNDRV_PCM_STATE_RUNNING: 2550 return snd_pcm_update_hw_ptr(substream); 2551 case SNDRV_PCM_STATE_PREPARED: 2552 case SNDRV_PCM_STATE_PAUSED: 2553 return 0; 2554 case SNDRV_PCM_STATE_SUSPENDED: 2555 return -ESTRPIPE; 2556 case SNDRV_PCM_STATE_XRUN: 2557 return -EPIPE; 2558 default: 2559 return -EBADFD; 2560 } 2561 } 2562 2563 /* increase the appl_ptr; returns the processed frames or a negative error */ 2564 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2565 snd_pcm_uframes_t frames, 2566 snd_pcm_sframes_t avail) 2567 { 2568 struct snd_pcm_runtime *runtime = substream->runtime; 2569 snd_pcm_sframes_t appl_ptr; 2570 int ret; 2571 2572 if (avail <= 0) 2573 return 0; 2574 if (frames > (snd_pcm_uframes_t)avail) 2575 frames = avail; 2576 appl_ptr = runtime->control->appl_ptr + frames; 2577 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2578 appl_ptr -= runtime->boundary; 2579 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2580 return ret < 0 ? ret : frames; 2581 } 2582 2583 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2584 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2585 snd_pcm_uframes_t frames, 2586 snd_pcm_sframes_t avail) 2587 { 2588 struct snd_pcm_runtime *runtime = substream->runtime; 2589 snd_pcm_sframes_t appl_ptr; 2590 int ret; 2591 2592 if (avail <= 0) 2593 return 0; 2594 if (frames > (snd_pcm_uframes_t)avail) 2595 frames = avail; 2596 appl_ptr = runtime->control->appl_ptr - frames; 2597 if (appl_ptr < 0) 2598 appl_ptr += runtime->boundary; 2599 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2600 /* NOTE: we return zero for errors because PulseAudio gets depressed 2601 * upon receiving an error from rewind ioctl and stops processing 2602 * any longer. Returning zero means that no rewind is done, so 2603 * it's not absolutely wrong to answer like that. 2604 */ 2605 return ret < 0 ? 0 : frames; 2606 } 2607 2608 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2609 snd_pcm_uframes_t frames) 2610 { 2611 struct snd_pcm_runtime *runtime = substream->runtime; 2612 snd_pcm_sframes_t ret; 2613 2614 if (frames == 0) 2615 return 0; 2616 2617 snd_pcm_stream_lock_irq(substream); 2618 ret = do_pcm_hwsync(substream); 2619 if (!ret) 2620 ret = rewind_appl_ptr(substream, frames, 2621 snd_pcm_playback_hw_avail(runtime)); 2622 snd_pcm_stream_unlock_irq(substream); 2623 return ret; 2624 } 2625 2626 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2627 snd_pcm_uframes_t frames) 2628 { 2629 struct snd_pcm_runtime *runtime = substream->runtime; 2630 snd_pcm_sframes_t ret; 2631 2632 if (frames == 0) 2633 return 0; 2634 2635 snd_pcm_stream_lock_irq(substream); 2636 ret = do_pcm_hwsync(substream); 2637 if (!ret) 2638 ret = rewind_appl_ptr(substream, frames, 2639 snd_pcm_capture_hw_avail(runtime)); 2640 snd_pcm_stream_unlock_irq(substream); 2641 return ret; 2642 } 2643 2644 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2645 snd_pcm_uframes_t frames) 2646 { 2647 struct snd_pcm_runtime *runtime = substream->runtime; 2648 snd_pcm_sframes_t ret; 2649 2650 if (frames == 0) 2651 return 0; 2652 2653 snd_pcm_stream_lock_irq(substream); 2654 ret = do_pcm_hwsync(substream); 2655 if (!ret) 2656 ret = forward_appl_ptr(substream, frames, 2657 snd_pcm_playback_avail(runtime)); 2658 snd_pcm_stream_unlock_irq(substream); 2659 return ret; 2660 } 2661 2662 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2663 snd_pcm_uframes_t frames) 2664 { 2665 struct snd_pcm_runtime *runtime = substream->runtime; 2666 snd_pcm_sframes_t ret; 2667 2668 if (frames == 0) 2669 return 0; 2670 2671 snd_pcm_stream_lock_irq(substream); 2672 ret = do_pcm_hwsync(substream); 2673 if (!ret) 2674 ret = forward_appl_ptr(substream, frames, 2675 snd_pcm_capture_avail(runtime)); 2676 snd_pcm_stream_unlock_irq(substream); 2677 return ret; 2678 } 2679 2680 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2681 { 2682 int err; 2683 2684 snd_pcm_stream_lock_irq(substream); 2685 err = do_pcm_hwsync(substream); 2686 snd_pcm_stream_unlock_irq(substream); 2687 return err; 2688 } 2689 2690 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream) 2691 { 2692 struct snd_pcm_runtime *runtime = substream->runtime; 2693 int err; 2694 snd_pcm_sframes_t n = 0; 2695 2696 snd_pcm_stream_lock_irq(substream); 2697 err = do_pcm_hwsync(substream); 2698 if (!err) { 2699 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2700 n = snd_pcm_playback_hw_avail(runtime); 2701 else 2702 n = snd_pcm_capture_avail(runtime); 2703 n += runtime->delay; 2704 } 2705 snd_pcm_stream_unlock_irq(substream); 2706 return err < 0 ? err : n; 2707 } 2708 2709 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2710 struct snd_pcm_sync_ptr __user *_sync_ptr) 2711 { 2712 struct snd_pcm_runtime *runtime = substream->runtime; 2713 struct snd_pcm_sync_ptr sync_ptr; 2714 volatile struct snd_pcm_mmap_status *status; 2715 volatile struct snd_pcm_mmap_control *control; 2716 int err; 2717 2718 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2719 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2720 return -EFAULT; 2721 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2722 return -EFAULT; 2723 status = runtime->status; 2724 control = runtime->control; 2725 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2726 err = snd_pcm_hwsync(substream); 2727 if (err < 0) 2728 return err; 2729 } 2730 snd_pcm_stream_lock_irq(substream); 2731 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2732 err = pcm_lib_apply_appl_ptr(substream, 2733 sync_ptr.c.control.appl_ptr); 2734 if (err < 0) { 2735 snd_pcm_stream_unlock_irq(substream); 2736 return err; 2737 } 2738 } else { 2739 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2740 } 2741 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2742 control->avail_min = sync_ptr.c.control.avail_min; 2743 else 2744 sync_ptr.c.control.avail_min = control->avail_min; 2745 sync_ptr.s.status.state = status->state; 2746 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2747 sync_ptr.s.status.tstamp = status->tstamp; 2748 sync_ptr.s.status.suspended_state = status->suspended_state; 2749 snd_pcm_stream_unlock_irq(substream); 2750 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2751 return -EFAULT; 2752 return 0; 2753 } 2754 2755 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2756 { 2757 struct snd_pcm_runtime *runtime = substream->runtime; 2758 int arg; 2759 2760 if (get_user(arg, _arg)) 2761 return -EFAULT; 2762 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2763 return -EINVAL; 2764 runtime->tstamp_type = arg; 2765 return 0; 2766 } 2767 2768 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2769 struct snd_xferi __user *_xferi) 2770 { 2771 struct snd_xferi xferi; 2772 struct snd_pcm_runtime *runtime = substream->runtime; 2773 snd_pcm_sframes_t result; 2774 2775 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2776 return -EBADFD; 2777 if (put_user(0, &_xferi->result)) 2778 return -EFAULT; 2779 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2780 return -EFAULT; 2781 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2782 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2783 else 2784 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2785 __put_user(result, &_xferi->result); 2786 return result < 0 ? result : 0; 2787 } 2788 2789 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2790 struct snd_xfern __user *_xfern) 2791 { 2792 struct snd_xfern xfern; 2793 struct snd_pcm_runtime *runtime = substream->runtime; 2794 void *bufs; 2795 snd_pcm_sframes_t result; 2796 2797 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2798 return -EBADFD; 2799 if (runtime->channels > 128) 2800 return -EINVAL; 2801 if (put_user(0, &_xfern->result)) 2802 return -EFAULT; 2803 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2804 return -EFAULT; 2805 2806 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2807 if (IS_ERR(bufs)) 2808 return PTR_ERR(bufs); 2809 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2810 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2811 else 2812 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2813 kfree(bufs); 2814 __put_user(result, &_xfern->result); 2815 return result < 0 ? result : 0; 2816 } 2817 2818 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2819 snd_pcm_uframes_t __user *_frames) 2820 { 2821 snd_pcm_uframes_t frames; 2822 snd_pcm_sframes_t result; 2823 2824 if (get_user(frames, _frames)) 2825 return -EFAULT; 2826 if (put_user(0, _frames)) 2827 return -EFAULT; 2828 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2829 result = snd_pcm_playback_rewind(substream, frames); 2830 else 2831 result = snd_pcm_capture_rewind(substream, frames); 2832 __put_user(result, _frames); 2833 return result < 0 ? result : 0; 2834 } 2835 2836 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2837 snd_pcm_uframes_t __user *_frames) 2838 { 2839 snd_pcm_uframes_t frames; 2840 snd_pcm_sframes_t result; 2841 2842 if (get_user(frames, _frames)) 2843 return -EFAULT; 2844 if (put_user(0, _frames)) 2845 return -EFAULT; 2846 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2847 result = snd_pcm_playback_forward(substream, frames); 2848 else 2849 result = snd_pcm_capture_forward(substream, frames); 2850 __put_user(result, _frames); 2851 return result < 0 ? result : 0; 2852 } 2853 2854 static int snd_pcm_common_ioctl(struct file *file, 2855 struct snd_pcm_substream *substream, 2856 unsigned int cmd, void __user *arg) 2857 { 2858 struct snd_pcm_file *pcm_file = file->private_data; 2859 int res; 2860 2861 if (PCM_RUNTIME_CHECK(substream)) 2862 return -ENXIO; 2863 2864 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2865 if (res < 0) 2866 return res; 2867 2868 switch (cmd) { 2869 case SNDRV_PCM_IOCTL_PVERSION: 2870 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2871 case SNDRV_PCM_IOCTL_INFO: 2872 return snd_pcm_info_user(substream, arg); 2873 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2874 return 0; 2875 case SNDRV_PCM_IOCTL_TTSTAMP: 2876 return snd_pcm_tstamp(substream, arg); 2877 case SNDRV_PCM_IOCTL_USER_PVERSION: 2878 if (get_user(pcm_file->user_pversion, 2879 (unsigned int __user *)arg)) 2880 return -EFAULT; 2881 return 0; 2882 case SNDRV_PCM_IOCTL_HW_REFINE: 2883 return snd_pcm_hw_refine_user(substream, arg); 2884 case SNDRV_PCM_IOCTL_HW_PARAMS: 2885 return snd_pcm_hw_params_user(substream, arg); 2886 case SNDRV_PCM_IOCTL_HW_FREE: 2887 return snd_pcm_hw_free(substream); 2888 case SNDRV_PCM_IOCTL_SW_PARAMS: 2889 return snd_pcm_sw_params_user(substream, arg); 2890 case SNDRV_PCM_IOCTL_STATUS: 2891 return snd_pcm_status_user(substream, arg, false); 2892 case SNDRV_PCM_IOCTL_STATUS_EXT: 2893 return snd_pcm_status_user(substream, arg, true); 2894 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2895 return snd_pcm_channel_info_user(substream, arg); 2896 case SNDRV_PCM_IOCTL_PREPARE: 2897 return snd_pcm_prepare(substream, file); 2898 case SNDRV_PCM_IOCTL_RESET: 2899 return snd_pcm_reset(substream); 2900 case SNDRV_PCM_IOCTL_START: 2901 return snd_pcm_start_lock_irq(substream); 2902 case SNDRV_PCM_IOCTL_LINK: 2903 return snd_pcm_link(substream, (int)(unsigned long) arg); 2904 case SNDRV_PCM_IOCTL_UNLINK: 2905 return snd_pcm_unlink(substream); 2906 case SNDRV_PCM_IOCTL_RESUME: 2907 return snd_pcm_resume(substream); 2908 case SNDRV_PCM_IOCTL_XRUN: 2909 return snd_pcm_xrun(substream); 2910 case SNDRV_PCM_IOCTL_HWSYNC: 2911 return snd_pcm_hwsync(substream); 2912 case SNDRV_PCM_IOCTL_DELAY: 2913 { 2914 snd_pcm_sframes_t delay = snd_pcm_delay(substream); 2915 snd_pcm_sframes_t __user *res = arg; 2916 2917 if (delay < 0) 2918 return delay; 2919 if (put_user(delay, res)) 2920 return -EFAULT; 2921 return 0; 2922 } 2923 case SNDRV_PCM_IOCTL_SYNC_PTR: 2924 return snd_pcm_sync_ptr(substream, arg); 2925 #ifdef CONFIG_SND_SUPPORT_OLD_API 2926 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2927 return snd_pcm_hw_refine_old_user(substream, arg); 2928 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2929 return snd_pcm_hw_params_old_user(substream, arg); 2930 #endif 2931 case SNDRV_PCM_IOCTL_DRAIN: 2932 return snd_pcm_drain(substream, file); 2933 case SNDRV_PCM_IOCTL_DROP: 2934 return snd_pcm_drop(substream); 2935 case SNDRV_PCM_IOCTL_PAUSE: 2936 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2937 substream, 2938 (int)(unsigned long)arg); 2939 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2940 case SNDRV_PCM_IOCTL_READI_FRAMES: 2941 return snd_pcm_xferi_frames_ioctl(substream, arg); 2942 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2943 case SNDRV_PCM_IOCTL_READN_FRAMES: 2944 return snd_pcm_xfern_frames_ioctl(substream, arg); 2945 case SNDRV_PCM_IOCTL_REWIND: 2946 return snd_pcm_rewind_ioctl(substream, arg); 2947 case SNDRV_PCM_IOCTL_FORWARD: 2948 return snd_pcm_forward_ioctl(substream, arg); 2949 } 2950 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2951 return -ENOTTY; 2952 } 2953 2954 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 2955 unsigned long arg) 2956 { 2957 struct snd_pcm_file *pcm_file; 2958 2959 pcm_file = file->private_data; 2960 2961 if (((cmd >> 8) & 0xff) != 'A') 2962 return -ENOTTY; 2963 2964 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 2965 (void __user *)arg); 2966 } 2967 2968 /** 2969 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 2970 * @substream: PCM substream 2971 * @cmd: IOCTL cmd 2972 * @arg: IOCTL argument 2973 * 2974 * The function is provided primarily for OSS layer and USB gadget drivers, 2975 * and it allows only the limited set of ioctls (hw_params, sw_params, 2976 * prepare, start, drain, drop, forward). 2977 */ 2978 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2979 unsigned int cmd, void *arg) 2980 { 2981 snd_pcm_uframes_t *frames = arg; 2982 snd_pcm_sframes_t result; 2983 2984 switch (cmd) { 2985 case SNDRV_PCM_IOCTL_FORWARD: 2986 { 2987 /* provided only for OSS; capture-only and no value returned */ 2988 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 2989 return -EINVAL; 2990 result = snd_pcm_capture_forward(substream, *frames); 2991 return result < 0 ? result : 0; 2992 } 2993 case SNDRV_PCM_IOCTL_HW_PARAMS: 2994 return snd_pcm_hw_params(substream, arg); 2995 case SNDRV_PCM_IOCTL_SW_PARAMS: 2996 return snd_pcm_sw_params(substream, arg); 2997 case SNDRV_PCM_IOCTL_PREPARE: 2998 return snd_pcm_prepare(substream, NULL); 2999 case SNDRV_PCM_IOCTL_START: 3000 return snd_pcm_start_lock_irq(substream); 3001 case SNDRV_PCM_IOCTL_DRAIN: 3002 return snd_pcm_drain(substream, NULL); 3003 case SNDRV_PCM_IOCTL_DROP: 3004 return snd_pcm_drop(substream); 3005 case SNDRV_PCM_IOCTL_DELAY: 3006 { 3007 result = snd_pcm_delay(substream); 3008 if (result < 0) 3009 return result; 3010 *frames = result; 3011 return 0; 3012 } 3013 default: 3014 return -EINVAL; 3015 } 3016 } 3017 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3018 3019 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3020 loff_t * offset) 3021 { 3022 struct snd_pcm_file *pcm_file; 3023 struct snd_pcm_substream *substream; 3024 struct snd_pcm_runtime *runtime; 3025 snd_pcm_sframes_t result; 3026 3027 pcm_file = file->private_data; 3028 substream = pcm_file->substream; 3029 if (PCM_RUNTIME_CHECK(substream)) 3030 return -ENXIO; 3031 runtime = substream->runtime; 3032 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3033 return -EBADFD; 3034 if (!frame_aligned(runtime, count)) 3035 return -EINVAL; 3036 count = bytes_to_frames(runtime, count); 3037 result = snd_pcm_lib_read(substream, buf, count); 3038 if (result > 0) 3039 result = frames_to_bytes(runtime, result); 3040 return result; 3041 } 3042 3043 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3044 size_t count, loff_t * offset) 3045 { 3046 struct snd_pcm_file *pcm_file; 3047 struct snd_pcm_substream *substream; 3048 struct snd_pcm_runtime *runtime; 3049 snd_pcm_sframes_t result; 3050 3051 pcm_file = file->private_data; 3052 substream = pcm_file->substream; 3053 if (PCM_RUNTIME_CHECK(substream)) 3054 return -ENXIO; 3055 runtime = substream->runtime; 3056 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3057 return -EBADFD; 3058 if (!frame_aligned(runtime, count)) 3059 return -EINVAL; 3060 count = bytes_to_frames(runtime, count); 3061 result = snd_pcm_lib_write(substream, buf, count); 3062 if (result > 0) 3063 result = frames_to_bytes(runtime, result); 3064 return result; 3065 } 3066 3067 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3068 { 3069 struct snd_pcm_file *pcm_file; 3070 struct snd_pcm_substream *substream; 3071 struct snd_pcm_runtime *runtime; 3072 snd_pcm_sframes_t result; 3073 unsigned long i; 3074 void __user **bufs; 3075 snd_pcm_uframes_t frames; 3076 3077 pcm_file = iocb->ki_filp->private_data; 3078 substream = pcm_file->substream; 3079 if (PCM_RUNTIME_CHECK(substream)) 3080 return -ENXIO; 3081 runtime = substream->runtime; 3082 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3083 return -EBADFD; 3084 if (!iter_is_iovec(to)) 3085 return -EINVAL; 3086 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3087 return -EINVAL; 3088 if (!frame_aligned(runtime, to->iov->iov_len)) 3089 return -EINVAL; 3090 frames = bytes_to_samples(runtime, to->iov->iov_len); 3091 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3092 if (bufs == NULL) 3093 return -ENOMEM; 3094 for (i = 0; i < to->nr_segs; ++i) 3095 bufs[i] = to->iov[i].iov_base; 3096 result = snd_pcm_lib_readv(substream, bufs, frames); 3097 if (result > 0) 3098 result = frames_to_bytes(runtime, result); 3099 kfree(bufs); 3100 return result; 3101 } 3102 3103 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3104 { 3105 struct snd_pcm_file *pcm_file; 3106 struct snd_pcm_substream *substream; 3107 struct snd_pcm_runtime *runtime; 3108 snd_pcm_sframes_t result; 3109 unsigned long i; 3110 void __user **bufs; 3111 snd_pcm_uframes_t frames; 3112 3113 pcm_file = iocb->ki_filp->private_data; 3114 substream = pcm_file->substream; 3115 if (PCM_RUNTIME_CHECK(substream)) 3116 return -ENXIO; 3117 runtime = substream->runtime; 3118 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3119 return -EBADFD; 3120 if (!iter_is_iovec(from)) 3121 return -EINVAL; 3122 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3123 !frame_aligned(runtime, from->iov->iov_len)) 3124 return -EINVAL; 3125 frames = bytes_to_samples(runtime, from->iov->iov_len); 3126 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3127 if (bufs == NULL) 3128 return -ENOMEM; 3129 for (i = 0; i < from->nr_segs; ++i) 3130 bufs[i] = from->iov[i].iov_base; 3131 result = snd_pcm_lib_writev(substream, bufs, frames); 3132 if (result > 0) 3133 result = frames_to_bytes(runtime, result); 3134 kfree(bufs); 3135 return result; 3136 } 3137 3138 static __poll_t snd_pcm_playback_poll(struct file *file, poll_table * wait) 3139 { 3140 struct snd_pcm_file *pcm_file; 3141 struct snd_pcm_substream *substream; 3142 struct snd_pcm_runtime *runtime; 3143 __poll_t mask; 3144 snd_pcm_uframes_t avail; 3145 3146 pcm_file = file->private_data; 3147 3148 substream = pcm_file->substream; 3149 if (PCM_RUNTIME_CHECK(substream)) 3150 return EPOLLOUT | EPOLLWRNORM | EPOLLERR; 3151 runtime = substream->runtime; 3152 3153 poll_wait(file, &runtime->sleep, wait); 3154 3155 snd_pcm_stream_lock_irq(substream); 3156 avail = snd_pcm_playback_avail(runtime); 3157 switch (runtime->status->state) { 3158 case SNDRV_PCM_STATE_RUNNING: 3159 case SNDRV_PCM_STATE_PREPARED: 3160 case SNDRV_PCM_STATE_PAUSED: 3161 if (avail >= runtime->control->avail_min) { 3162 mask = EPOLLOUT | EPOLLWRNORM; 3163 break; 3164 } 3165 /* Fall through */ 3166 case SNDRV_PCM_STATE_DRAINING: 3167 mask = 0; 3168 break; 3169 default: 3170 mask = EPOLLOUT | EPOLLWRNORM | EPOLLERR; 3171 break; 3172 } 3173 snd_pcm_stream_unlock_irq(substream); 3174 return mask; 3175 } 3176 3177 static __poll_t snd_pcm_capture_poll(struct file *file, poll_table * wait) 3178 { 3179 struct snd_pcm_file *pcm_file; 3180 struct snd_pcm_substream *substream; 3181 struct snd_pcm_runtime *runtime; 3182 __poll_t mask; 3183 snd_pcm_uframes_t avail; 3184 3185 pcm_file = file->private_data; 3186 3187 substream = pcm_file->substream; 3188 if (PCM_RUNTIME_CHECK(substream)) 3189 return EPOLLIN | EPOLLRDNORM | EPOLLERR; 3190 runtime = substream->runtime; 3191 3192 poll_wait(file, &runtime->sleep, wait); 3193 3194 snd_pcm_stream_lock_irq(substream); 3195 avail = snd_pcm_capture_avail(runtime); 3196 switch (runtime->status->state) { 3197 case SNDRV_PCM_STATE_RUNNING: 3198 case SNDRV_PCM_STATE_PREPARED: 3199 case SNDRV_PCM_STATE_PAUSED: 3200 if (avail >= runtime->control->avail_min) { 3201 mask = EPOLLIN | EPOLLRDNORM; 3202 break; 3203 } 3204 mask = 0; 3205 break; 3206 case SNDRV_PCM_STATE_DRAINING: 3207 if (avail > 0) { 3208 mask = EPOLLIN | EPOLLRDNORM; 3209 break; 3210 } 3211 /* Fall through */ 3212 default: 3213 mask = EPOLLIN | EPOLLRDNORM | EPOLLERR; 3214 break; 3215 } 3216 snd_pcm_stream_unlock_irq(substream); 3217 return mask; 3218 } 3219 3220 /* 3221 * mmap support 3222 */ 3223 3224 /* 3225 * Only on coherent architectures, we can mmap the status and the control records 3226 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3227 */ 3228 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3229 /* 3230 * mmap status record 3231 */ 3232 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3233 { 3234 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3235 struct snd_pcm_runtime *runtime; 3236 3237 if (substream == NULL) 3238 return VM_FAULT_SIGBUS; 3239 runtime = substream->runtime; 3240 vmf->page = virt_to_page(runtime->status); 3241 get_page(vmf->page); 3242 return 0; 3243 } 3244 3245 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3246 { 3247 .fault = snd_pcm_mmap_status_fault, 3248 }; 3249 3250 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3251 struct vm_area_struct *area) 3252 { 3253 long size; 3254 if (!(area->vm_flags & VM_READ)) 3255 return -EINVAL; 3256 size = area->vm_end - area->vm_start; 3257 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3258 return -EINVAL; 3259 area->vm_ops = &snd_pcm_vm_ops_status; 3260 area->vm_private_data = substream; 3261 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3262 return 0; 3263 } 3264 3265 /* 3266 * mmap control record 3267 */ 3268 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3269 { 3270 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3271 struct snd_pcm_runtime *runtime; 3272 3273 if (substream == NULL) 3274 return VM_FAULT_SIGBUS; 3275 runtime = substream->runtime; 3276 vmf->page = virt_to_page(runtime->control); 3277 get_page(vmf->page); 3278 return 0; 3279 } 3280 3281 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3282 { 3283 .fault = snd_pcm_mmap_control_fault, 3284 }; 3285 3286 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3287 struct vm_area_struct *area) 3288 { 3289 long size; 3290 if (!(area->vm_flags & VM_READ)) 3291 return -EINVAL; 3292 size = area->vm_end - area->vm_start; 3293 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3294 return -EINVAL; 3295 area->vm_ops = &snd_pcm_vm_ops_control; 3296 area->vm_private_data = substream; 3297 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3298 return 0; 3299 } 3300 3301 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3302 { 3303 if (pcm_file->no_compat_mmap) 3304 return false; 3305 /* See pcm_control_mmap_allowed() below. 3306 * Since older alsa-lib requires both status and control mmaps to be 3307 * coupled, we have to disable the status mmap for old alsa-lib, too. 3308 */ 3309 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3310 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3311 return false; 3312 return true; 3313 } 3314 3315 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3316 { 3317 if (pcm_file->no_compat_mmap) 3318 return false; 3319 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3320 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3321 * thus it effectively assures the manual update of appl_ptr. 3322 */ 3323 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3324 return false; 3325 return true; 3326 } 3327 3328 #else /* ! coherent mmap */ 3329 /* 3330 * don't support mmap for status and control records. 3331 */ 3332 #define pcm_status_mmap_allowed(pcm_file) false 3333 #define pcm_control_mmap_allowed(pcm_file) false 3334 3335 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3336 struct vm_area_struct *area) 3337 { 3338 return -ENXIO; 3339 } 3340 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3341 struct vm_area_struct *area) 3342 { 3343 return -ENXIO; 3344 } 3345 #endif /* coherent mmap */ 3346 3347 static inline struct page * 3348 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3349 { 3350 void *vaddr = substream->runtime->dma_area + ofs; 3351 return virt_to_page(vaddr); 3352 } 3353 3354 /* 3355 * fault callback for mmapping a RAM page 3356 */ 3357 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3358 { 3359 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3360 struct snd_pcm_runtime *runtime; 3361 unsigned long offset; 3362 struct page * page; 3363 size_t dma_bytes; 3364 3365 if (substream == NULL) 3366 return VM_FAULT_SIGBUS; 3367 runtime = substream->runtime; 3368 offset = vmf->pgoff << PAGE_SHIFT; 3369 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3370 if (offset > dma_bytes - PAGE_SIZE) 3371 return VM_FAULT_SIGBUS; 3372 if (substream->ops->page) 3373 page = substream->ops->page(substream, offset); 3374 else 3375 page = snd_pcm_default_page_ops(substream, offset); 3376 if (!page) 3377 return VM_FAULT_SIGBUS; 3378 get_page(page); 3379 vmf->page = page; 3380 return 0; 3381 } 3382 3383 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3384 .open = snd_pcm_mmap_data_open, 3385 .close = snd_pcm_mmap_data_close, 3386 }; 3387 3388 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3389 .open = snd_pcm_mmap_data_open, 3390 .close = snd_pcm_mmap_data_close, 3391 .fault = snd_pcm_mmap_data_fault, 3392 }; 3393 3394 /* 3395 * mmap the DMA buffer on RAM 3396 */ 3397 3398 /** 3399 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3400 * @substream: PCM substream 3401 * @area: VMA 3402 * 3403 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3404 * this function is invoked implicitly. 3405 */ 3406 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3407 struct vm_area_struct *area) 3408 { 3409 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3410 #ifdef CONFIG_GENERIC_ALLOCATOR 3411 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3412 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3413 return remap_pfn_range(area, area->vm_start, 3414 substream->dma_buffer.addr >> PAGE_SHIFT, 3415 area->vm_end - area->vm_start, area->vm_page_prot); 3416 } 3417 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3418 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3419 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3420 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3421 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3422 area, 3423 substream->runtime->dma_area, 3424 substream->runtime->dma_addr, 3425 area->vm_end - area->vm_start); 3426 #endif /* CONFIG_X86 */ 3427 /* mmap with fault handler */ 3428 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3429 return 0; 3430 } 3431 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3432 3433 /* 3434 * mmap the DMA buffer on I/O memory area 3435 */ 3436 #if SNDRV_PCM_INFO_MMAP_IOMEM 3437 /** 3438 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3439 * @substream: PCM substream 3440 * @area: VMA 3441 * 3442 * When your hardware uses the iomapped pages as the hardware buffer and 3443 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3444 * is supposed to work only on limited architectures. 3445 */ 3446 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3447 struct vm_area_struct *area) 3448 { 3449 struct snd_pcm_runtime *runtime = substream->runtime; 3450 3451 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3452 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3453 } 3454 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3455 #endif /* SNDRV_PCM_INFO_MMAP */ 3456 3457 /* 3458 * mmap DMA buffer 3459 */ 3460 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3461 struct vm_area_struct *area) 3462 { 3463 struct snd_pcm_runtime *runtime; 3464 long size; 3465 unsigned long offset; 3466 size_t dma_bytes; 3467 int err; 3468 3469 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3470 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3471 return -EINVAL; 3472 } else { 3473 if (!(area->vm_flags & VM_READ)) 3474 return -EINVAL; 3475 } 3476 runtime = substream->runtime; 3477 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3478 return -EBADFD; 3479 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3480 return -ENXIO; 3481 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3482 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3483 return -EINVAL; 3484 size = area->vm_end - area->vm_start; 3485 offset = area->vm_pgoff << PAGE_SHIFT; 3486 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3487 if ((size_t)size > dma_bytes) 3488 return -EINVAL; 3489 if (offset > dma_bytes - size) 3490 return -EINVAL; 3491 3492 area->vm_ops = &snd_pcm_vm_ops_data; 3493 area->vm_private_data = substream; 3494 if (substream->ops->mmap) 3495 err = substream->ops->mmap(substream, area); 3496 else 3497 err = snd_pcm_lib_default_mmap(substream, area); 3498 if (!err) 3499 atomic_inc(&substream->mmap_count); 3500 return err; 3501 } 3502 EXPORT_SYMBOL(snd_pcm_mmap_data); 3503 3504 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3505 { 3506 struct snd_pcm_file * pcm_file; 3507 struct snd_pcm_substream *substream; 3508 unsigned long offset; 3509 3510 pcm_file = file->private_data; 3511 substream = pcm_file->substream; 3512 if (PCM_RUNTIME_CHECK(substream)) 3513 return -ENXIO; 3514 3515 offset = area->vm_pgoff << PAGE_SHIFT; 3516 switch (offset) { 3517 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3518 if (!pcm_status_mmap_allowed(pcm_file)) 3519 return -ENXIO; 3520 return snd_pcm_mmap_status(substream, file, area); 3521 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3522 if (!pcm_control_mmap_allowed(pcm_file)) 3523 return -ENXIO; 3524 return snd_pcm_mmap_control(substream, file, area); 3525 default: 3526 return snd_pcm_mmap_data(substream, file, area); 3527 } 3528 return 0; 3529 } 3530 3531 static int snd_pcm_fasync(int fd, struct file * file, int on) 3532 { 3533 struct snd_pcm_file * pcm_file; 3534 struct snd_pcm_substream *substream; 3535 struct snd_pcm_runtime *runtime; 3536 3537 pcm_file = file->private_data; 3538 substream = pcm_file->substream; 3539 if (PCM_RUNTIME_CHECK(substream)) 3540 return -ENXIO; 3541 runtime = substream->runtime; 3542 return fasync_helper(fd, file, on, &runtime->fasync); 3543 } 3544 3545 /* 3546 * ioctl32 compat 3547 */ 3548 #ifdef CONFIG_COMPAT 3549 #include "pcm_compat.c" 3550 #else 3551 #define snd_pcm_ioctl_compat NULL 3552 #endif 3553 3554 /* 3555 * To be removed helpers to keep binary compatibility 3556 */ 3557 3558 #ifdef CONFIG_SND_SUPPORT_OLD_API 3559 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3560 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3561 3562 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3563 struct snd_pcm_hw_params_old *oparams) 3564 { 3565 unsigned int i; 3566 3567 memset(params, 0, sizeof(*params)); 3568 params->flags = oparams->flags; 3569 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3570 params->masks[i].bits[0] = oparams->masks[i]; 3571 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3572 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3573 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3574 params->info = oparams->info; 3575 params->msbits = oparams->msbits; 3576 params->rate_num = oparams->rate_num; 3577 params->rate_den = oparams->rate_den; 3578 params->fifo_size = oparams->fifo_size; 3579 } 3580 3581 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3582 struct snd_pcm_hw_params *params) 3583 { 3584 unsigned int i; 3585 3586 memset(oparams, 0, sizeof(*oparams)); 3587 oparams->flags = params->flags; 3588 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3589 oparams->masks[i] = params->masks[i].bits[0]; 3590 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3591 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3592 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3593 oparams->info = params->info; 3594 oparams->msbits = params->msbits; 3595 oparams->rate_num = params->rate_num; 3596 oparams->rate_den = params->rate_den; 3597 oparams->fifo_size = params->fifo_size; 3598 } 3599 3600 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3601 struct snd_pcm_hw_params_old __user * _oparams) 3602 { 3603 struct snd_pcm_hw_params *params; 3604 struct snd_pcm_hw_params_old *oparams = NULL; 3605 int err; 3606 3607 params = kmalloc(sizeof(*params), GFP_KERNEL); 3608 if (!params) 3609 return -ENOMEM; 3610 3611 oparams = memdup_user(_oparams, sizeof(*oparams)); 3612 if (IS_ERR(oparams)) { 3613 err = PTR_ERR(oparams); 3614 goto out; 3615 } 3616 snd_pcm_hw_convert_from_old_params(params, oparams); 3617 err = snd_pcm_hw_refine(substream, params); 3618 if (err < 0) 3619 goto out_old; 3620 3621 err = fixup_unreferenced_params(substream, params); 3622 if (err < 0) 3623 goto out_old; 3624 3625 snd_pcm_hw_convert_to_old_params(oparams, params); 3626 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3627 err = -EFAULT; 3628 out_old: 3629 kfree(oparams); 3630 out: 3631 kfree(params); 3632 return err; 3633 } 3634 3635 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3636 struct snd_pcm_hw_params_old __user * _oparams) 3637 { 3638 struct snd_pcm_hw_params *params; 3639 struct snd_pcm_hw_params_old *oparams = NULL; 3640 int err; 3641 3642 params = kmalloc(sizeof(*params), GFP_KERNEL); 3643 if (!params) 3644 return -ENOMEM; 3645 3646 oparams = memdup_user(_oparams, sizeof(*oparams)); 3647 if (IS_ERR(oparams)) { 3648 err = PTR_ERR(oparams); 3649 goto out; 3650 } 3651 3652 snd_pcm_hw_convert_from_old_params(params, oparams); 3653 err = snd_pcm_hw_params(substream, params); 3654 if (err < 0) 3655 goto out_old; 3656 3657 snd_pcm_hw_convert_to_old_params(oparams, params); 3658 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3659 err = -EFAULT; 3660 out_old: 3661 kfree(oparams); 3662 out: 3663 kfree(params); 3664 return err; 3665 } 3666 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3667 3668 #ifndef CONFIG_MMU 3669 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3670 unsigned long addr, 3671 unsigned long len, 3672 unsigned long pgoff, 3673 unsigned long flags) 3674 { 3675 struct snd_pcm_file *pcm_file = file->private_data; 3676 struct snd_pcm_substream *substream = pcm_file->substream; 3677 struct snd_pcm_runtime *runtime = substream->runtime; 3678 unsigned long offset = pgoff << PAGE_SHIFT; 3679 3680 switch (offset) { 3681 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3682 return (unsigned long)runtime->status; 3683 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3684 return (unsigned long)runtime->control; 3685 default: 3686 return (unsigned long)runtime->dma_area + offset; 3687 } 3688 } 3689 #else 3690 # define snd_pcm_get_unmapped_area NULL 3691 #endif 3692 3693 /* 3694 * Register section 3695 */ 3696 3697 const struct file_operations snd_pcm_f_ops[2] = { 3698 { 3699 .owner = THIS_MODULE, 3700 .write = snd_pcm_write, 3701 .write_iter = snd_pcm_writev, 3702 .open = snd_pcm_playback_open, 3703 .release = snd_pcm_release, 3704 .llseek = no_llseek, 3705 .poll = snd_pcm_playback_poll, 3706 .unlocked_ioctl = snd_pcm_ioctl, 3707 .compat_ioctl = snd_pcm_ioctl_compat, 3708 .mmap = snd_pcm_mmap, 3709 .fasync = snd_pcm_fasync, 3710 .get_unmapped_area = snd_pcm_get_unmapped_area, 3711 }, 3712 { 3713 .owner = THIS_MODULE, 3714 .read = snd_pcm_read, 3715 .read_iter = snd_pcm_readv, 3716 .open = snd_pcm_capture_open, 3717 .release = snd_pcm_release, 3718 .llseek = no_llseek, 3719 .poll = snd_pcm_capture_poll, 3720 .unlocked_ioctl = snd_pcm_ioctl, 3721 .compat_ioctl = snd_pcm_ioctl_compat, 3722 .mmap = snd_pcm_mmap, 3723 .fasync = snd_pcm_fasync, 3724 .get_unmapped_area = snd_pcm_get_unmapped_area, 3725 } 3726 }; 3727