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 #include <linux/delay.h> 40 41 #include "pcm_local.h" 42 43 #ifdef CONFIG_SND_DEBUG 44 #define CREATE_TRACE_POINTS 45 #include "pcm_param_trace.h" 46 #else 47 #define trace_hw_mask_param_enabled() 0 48 #define trace_hw_interval_param_enabled() 0 49 #define trace_hw_mask_param(substream, type, index, prev, curr) 50 #define trace_hw_interval_param(substream, type, index, prev, curr) 51 #endif 52 53 /* 54 * Compatibility 55 */ 56 57 struct snd_pcm_hw_params_old { 58 unsigned int flags; 59 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 60 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 61 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 62 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 63 unsigned int rmask; 64 unsigned int cmask; 65 unsigned int info; 66 unsigned int msbits; 67 unsigned int rate_num; 68 unsigned int rate_den; 69 snd_pcm_uframes_t fifo_size; 70 unsigned char reserved[64]; 71 }; 72 73 #ifdef CONFIG_SND_SUPPORT_OLD_API 74 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 75 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 76 77 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 78 struct snd_pcm_hw_params_old __user * _oparams); 79 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 80 struct snd_pcm_hw_params_old __user * _oparams); 81 #endif 82 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 83 84 /* 85 * 86 */ 87 88 static DEFINE_RWLOCK(snd_pcm_link_rwlock); 89 static DECLARE_RWSEM(snd_pcm_link_rwsem); 90 91 /* Writer in rwsem may block readers even during its waiting in queue, 92 * and this may lead to a deadlock when the code path takes read sem 93 * twice (e.g. one in snd_pcm_action_nonatomic() and another in 94 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to 95 * sleep until all the readers are completed without blocking by writer. 96 */ 97 static inline void down_write_nonfifo(struct rw_semaphore *lock) 98 { 99 while (!down_write_trylock(lock)) 100 msleep(1); 101 } 102 103 #define PCM_LOCK_DEFAULT 0 104 #define PCM_LOCK_IRQ 1 105 #define PCM_LOCK_IRQSAVE 2 106 107 static unsigned long __snd_pcm_stream_lock_mode(struct snd_pcm_substream *substream, 108 unsigned int mode) 109 { 110 unsigned long flags = 0; 111 if (substream->pcm->nonatomic) { 112 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING); 113 mutex_lock(&substream->self_group.mutex); 114 } else { 115 switch (mode) { 116 case PCM_LOCK_DEFAULT: 117 read_lock(&snd_pcm_link_rwlock); 118 break; 119 case PCM_LOCK_IRQ: 120 read_lock_irq(&snd_pcm_link_rwlock); 121 break; 122 case PCM_LOCK_IRQSAVE: 123 read_lock_irqsave(&snd_pcm_link_rwlock, flags); 124 break; 125 } 126 spin_lock(&substream->self_group.lock); 127 } 128 return flags; 129 } 130 131 static void __snd_pcm_stream_unlock_mode(struct snd_pcm_substream *substream, 132 unsigned int mode, unsigned long flags) 133 { 134 if (substream->pcm->nonatomic) { 135 mutex_unlock(&substream->self_group.mutex); 136 up_read(&snd_pcm_link_rwsem); 137 } else { 138 spin_unlock(&substream->self_group.lock); 139 140 switch (mode) { 141 case PCM_LOCK_DEFAULT: 142 read_unlock(&snd_pcm_link_rwlock); 143 break; 144 case PCM_LOCK_IRQ: 145 read_unlock_irq(&snd_pcm_link_rwlock); 146 break; 147 case PCM_LOCK_IRQSAVE: 148 read_unlock_irqrestore(&snd_pcm_link_rwlock, flags); 149 break; 150 } 151 } 152 } 153 154 /** 155 * snd_pcm_stream_lock - Lock the PCM stream 156 * @substream: PCM substream 157 * 158 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 159 * flag of the given substream. This also takes the global link rw lock 160 * (or rw sem), too, for avoiding the race with linked streams. 161 */ 162 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 163 { 164 __snd_pcm_stream_lock_mode(substream, PCM_LOCK_DEFAULT); 165 } 166 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 167 168 /** 169 * snd_pcm_stream_lock - Unlock the PCM stream 170 * @substream: PCM substream 171 * 172 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 173 */ 174 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 175 { 176 __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_DEFAULT, 0); 177 } 178 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 179 180 /** 181 * snd_pcm_stream_lock_irq - Lock the PCM stream 182 * @substream: PCM substream 183 * 184 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 185 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 186 * as snd_pcm_stream_lock(). 187 */ 188 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 189 { 190 __snd_pcm_stream_lock_mode(substream, PCM_LOCK_IRQ); 191 } 192 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 193 194 /** 195 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 196 * @substream: PCM substream 197 * 198 * This is a counter-part of snd_pcm_stream_lock_irq(). 199 */ 200 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 201 { 202 __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_IRQ, 0); 203 } 204 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 205 206 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 207 { 208 return __snd_pcm_stream_lock_mode(substream, PCM_LOCK_IRQSAVE); 209 } 210 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 211 212 /** 213 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 214 * @substream: PCM substream 215 * @flags: irq flags 216 * 217 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 218 */ 219 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 220 unsigned long flags) 221 { 222 __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_IRQSAVE, flags); 223 } 224 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 225 226 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 227 { 228 struct snd_pcm *pcm = substream->pcm; 229 struct snd_pcm_str *pstr = substream->pstr; 230 231 memset(info, 0, sizeof(*info)); 232 info->card = pcm->card->number; 233 info->device = pcm->device; 234 info->stream = substream->stream; 235 info->subdevice = substream->number; 236 strlcpy(info->id, pcm->id, sizeof(info->id)); 237 strlcpy(info->name, pcm->name, sizeof(info->name)); 238 info->dev_class = pcm->dev_class; 239 info->dev_subclass = pcm->dev_subclass; 240 info->subdevices_count = pstr->substream_count; 241 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 242 strlcpy(info->subname, substream->name, sizeof(info->subname)); 243 244 return 0; 245 } 246 247 int snd_pcm_info_user(struct snd_pcm_substream *substream, 248 struct snd_pcm_info __user * _info) 249 { 250 struct snd_pcm_info *info; 251 int err; 252 253 info = kmalloc(sizeof(*info), GFP_KERNEL); 254 if (! info) 255 return -ENOMEM; 256 err = snd_pcm_info(substream, info); 257 if (err >= 0) { 258 if (copy_to_user(_info, info, sizeof(*info))) 259 err = -EFAULT; 260 } 261 kfree(info); 262 return err; 263 } 264 265 static bool hw_support_mmap(struct snd_pcm_substream *substream) 266 { 267 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 268 return false; 269 /* architecture supports dma_mmap_coherent()? */ 270 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA) 271 if (!substream->ops->mmap && 272 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 273 return false; 274 #endif 275 return true; 276 } 277 278 static int constrain_mask_params(struct snd_pcm_substream *substream, 279 struct snd_pcm_hw_params *params) 280 { 281 struct snd_pcm_hw_constraints *constrs = 282 &substream->runtime->hw_constraints; 283 struct snd_mask *m; 284 unsigned int k; 285 struct snd_mask old_mask; 286 int changed; 287 288 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 289 m = hw_param_mask(params, k); 290 if (snd_mask_empty(m)) 291 return -EINVAL; 292 293 /* This parameter is not requested to change by a caller. */ 294 if (!(params->rmask & (1 << k))) 295 continue; 296 297 if (trace_hw_mask_param_enabled()) 298 old_mask = *m; 299 300 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 301 if (changed < 0) 302 return changed; 303 if (changed == 0) 304 continue; 305 306 /* Set corresponding flag so that the caller gets it. */ 307 trace_hw_mask_param(substream, k, 0, &old_mask, m); 308 params->cmask |= 1 << k; 309 } 310 311 return 0; 312 } 313 314 static int constrain_interval_params(struct snd_pcm_substream *substream, 315 struct snd_pcm_hw_params *params) 316 { 317 struct snd_pcm_hw_constraints *constrs = 318 &substream->runtime->hw_constraints; 319 struct snd_interval *i; 320 unsigned int k; 321 struct snd_interval old_interval; 322 int changed; 323 324 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 325 i = hw_param_interval(params, k); 326 if (snd_interval_empty(i)) 327 return -EINVAL; 328 329 /* This parameter is not requested to change by a caller. */ 330 if (!(params->rmask & (1 << k))) 331 continue; 332 333 if (trace_hw_interval_param_enabled()) 334 old_interval = *i; 335 336 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 337 if (changed < 0) 338 return changed; 339 if (changed == 0) 340 continue; 341 342 /* Set corresponding flag so that the caller gets it. */ 343 trace_hw_interval_param(substream, k, 0, &old_interval, i); 344 params->cmask |= 1 << k; 345 } 346 347 return 0; 348 } 349 350 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 351 struct snd_pcm_hw_params *params) 352 { 353 struct snd_pcm_hw_constraints *constrs = 354 &substream->runtime->hw_constraints; 355 unsigned int k; 356 unsigned int *rstamps; 357 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 358 unsigned int stamp; 359 struct snd_pcm_hw_rule *r; 360 unsigned int d; 361 struct snd_mask old_mask; 362 struct snd_interval old_interval; 363 bool again; 364 int changed, err = 0; 365 366 /* 367 * Each application of rule has own sequence number. 368 * 369 * Each member of 'rstamps' array represents the sequence number of 370 * recent application of corresponding rule. 371 */ 372 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 373 if (!rstamps) 374 return -ENOMEM; 375 376 /* 377 * Each member of 'vstamps' array represents the sequence number of 378 * recent application of rule in which corresponding parameters were 379 * changed. 380 * 381 * In initial state, elements corresponding to parameters requested by 382 * a caller is 1. For unrequested parameters, corresponding members 383 * have 0 so that the parameters are never changed anymore. 384 */ 385 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 386 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 387 388 /* Due to the above design, actual sequence number starts at 2. */ 389 stamp = 2; 390 retry: 391 /* Apply all rules in order. */ 392 again = false; 393 for (k = 0; k < constrs->rules_num; k++) { 394 r = &constrs->rules[k]; 395 396 /* 397 * Check condition bits of this rule. When the rule has 398 * some condition bits, parameter without the bits is 399 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 400 * is an example of the condition bits. 401 */ 402 if (r->cond && !(r->cond & params->flags)) 403 continue; 404 405 /* 406 * The 'deps' array includes maximum three dependencies 407 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 408 * member of this array is a sentinel and should be 409 * negative value. 410 * 411 * This rule should be processed in this time when dependent 412 * parameters were changed at former applications of the other 413 * rules. 414 */ 415 for (d = 0; r->deps[d] >= 0; d++) { 416 if (vstamps[r->deps[d]] > rstamps[k]) 417 break; 418 } 419 if (r->deps[d] < 0) 420 continue; 421 422 if (trace_hw_mask_param_enabled()) { 423 if (hw_is_mask(r->var)) 424 old_mask = *hw_param_mask(params, r->var); 425 } 426 if (trace_hw_interval_param_enabled()) { 427 if (hw_is_interval(r->var)) 428 old_interval = *hw_param_interval(params, r->var); 429 } 430 431 changed = r->func(params, r); 432 if (changed < 0) { 433 err = changed; 434 goto out; 435 } 436 437 /* 438 * When the parameter is changed, notify it to the caller 439 * by corresponding returned bit, then preparing for next 440 * iteration. 441 */ 442 if (changed && r->var >= 0) { 443 if (hw_is_mask(r->var)) { 444 trace_hw_mask_param(substream, r->var, 445 k + 1, &old_mask, 446 hw_param_mask(params, r->var)); 447 } 448 if (hw_is_interval(r->var)) { 449 trace_hw_interval_param(substream, r->var, 450 k + 1, &old_interval, 451 hw_param_interval(params, r->var)); 452 } 453 454 params->cmask |= (1 << r->var); 455 vstamps[r->var] = stamp; 456 again = true; 457 } 458 459 rstamps[k] = stamp++; 460 } 461 462 /* Iterate to evaluate all rules till no parameters are changed. */ 463 if (again) 464 goto retry; 465 466 out: 467 kfree(rstamps); 468 return err; 469 } 470 471 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 472 struct snd_pcm_hw_params *params) 473 { 474 const struct snd_interval *i; 475 const struct snd_mask *m; 476 int err; 477 478 if (!params->msbits) { 479 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 480 if (snd_interval_single(i)) 481 params->msbits = snd_interval_value(i); 482 } 483 484 if (!params->rate_den) { 485 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 486 if (snd_interval_single(i)) { 487 params->rate_num = snd_interval_value(i); 488 params->rate_den = 1; 489 } 490 } 491 492 if (!params->fifo_size) { 493 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 494 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 495 if (snd_mask_single(m) && snd_interval_single(i)) { 496 err = substream->ops->ioctl(substream, 497 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 498 if (err < 0) 499 return err; 500 } 501 } 502 503 if (!params->info) { 504 params->info = substream->runtime->hw.info; 505 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 506 SNDRV_PCM_INFO_DRAIN_TRIGGER); 507 if (!hw_support_mmap(substream)) 508 params->info &= ~(SNDRV_PCM_INFO_MMAP | 509 SNDRV_PCM_INFO_MMAP_VALID); 510 } 511 512 return 0; 513 } 514 515 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 516 struct snd_pcm_hw_params *params) 517 { 518 int err; 519 520 params->info = 0; 521 params->fifo_size = 0; 522 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 523 params->msbits = 0; 524 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 525 params->rate_num = 0; 526 params->rate_den = 0; 527 } 528 529 err = constrain_mask_params(substream, params); 530 if (err < 0) 531 return err; 532 533 err = constrain_interval_params(substream, params); 534 if (err < 0) 535 return err; 536 537 err = constrain_params_by_rules(substream, params); 538 if (err < 0) 539 return err; 540 541 params->rmask = 0; 542 543 return 0; 544 } 545 EXPORT_SYMBOL(snd_pcm_hw_refine); 546 547 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 548 struct snd_pcm_hw_params __user * _params) 549 { 550 struct snd_pcm_hw_params *params; 551 int err; 552 553 params = memdup_user(_params, sizeof(*params)); 554 if (IS_ERR(params)) 555 return PTR_ERR(params); 556 557 err = snd_pcm_hw_refine(substream, params); 558 if (err < 0) 559 goto end; 560 561 err = fixup_unreferenced_params(substream, params); 562 if (err < 0) 563 goto end; 564 565 if (copy_to_user(_params, params, sizeof(*params))) 566 err = -EFAULT; 567 end: 568 kfree(params); 569 return err; 570 } 571 572 static int period_to_usecs(struct snd_pcm_runtime *runtime) 573 { 574 int usecs; 575 576 if (! runtime->rate) 577 return -1; /* invalid */ 578 579 /* take 75% of period time as the deadline */ 580 usecs = (750000 / runtime->rate) * runtime->period_size; 581 usecs += ((750000 % runtime->rate) * runtime->period_size) / 582 runtime->rate; 583 584 return usecs; 585 } 586 587 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 588 { 589 snd_pcm_stream_lock_irq(substream); 590 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 591 substream->runtime->status->state = state; 592 snd_pcm_stream_unlock_irq(substream); 593 } 594 595 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 596 int event) 597 { 598 #ifdef CONFIG_SND_PCM_TIMER 599 if (substream->timer) 600 snd_timer_notify(substream->timer, event, 601 &substream->runtime->trigger_tstamp); 602 #endif 603 } 604 605 /** 606 * snd_pcm_hw_param_choose - choose a configuration defined by @params 607 * @pcm: PCM instance 608 * @params: the hw_params instance 609 * 610 * Choose one configuration from configuration space defined by @params. 611 * The configuration chosen is that obtained fixing in this order: 612 * first access, first format, first subformat, min channels, 613 * min rate, min period time, max buffer size, min tick time 614 * 615 * Return: Zero if successful, or a negative error code on failure. 616 */ 617 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 618 struct snd_pcm_hw_params *params) 619 { 620 static const int vars[] = { 621 SNDRV_PCM_HW_PARAM_ACCESS, 622 SNDRV_PCM_HW_PARAM_FORMAT, 623 SNDRV_PCM_HW_PARAM_SUBFORMAT, 624 SNDRV_PCM_HW_PARAM_CHANNELS, 625 SNDRV_PCM_HW_PARAM_RATE, 626 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 627 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 628 SNDRV_PCM_HW_PARAM_TICK_TIME, 629 -1 630 }; 631 const int *v; 632 struct snd_mask old_mask; 633 struct snd_interval old_interval; 634 int changed; 635 636 for (v = vars; *v != -1; v++) { 637 /* Keep old parameter to trace. */ 638 if (trace_hw_mask_param_enabled()) { 639 if (hw_is_mask(*v)) 640 old_mask = *hw_param_mask(params, *v); 641 } 642 if (trace_hw_interval_param_enabled()) { 643 if (hw_is_interval(*v)) 644 old_interval = *hw_param_interval(params, *v); 645 } 646 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 647 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 648 else 649 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 650 if (changed < 0) 651 return changed; 652 if (changed == 0) 653 continue; 654 655 /* Trace the changed parameter. */ 656 if (hw_is_mask(*v)) { 657 trace_hw_mask_param(pcm, *v, 0, &old_mask, 658 hw_param_mask(params, *v)); 659 } 660 if (hw_is_interval(*v)) { 661 trace_hw_interval_param(pcm, *v, 0, &old_interval, 662 hw_param_interval(params, *v)); 663 } 664 } 665 666 return 0; 667 } 668 669 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 670 struct snd_pcm_hw_params *params) 671 { 672 struct snd_pcm_runtime *runtime; 673 int err, usecs; 674 unsigned int bits; 675 snd_pcm_uframes_t frames; 676 677 if (PCM_RUNTIME_CHECK(substream)) 678 return -ENXIO; 679 runtime = substream->runtime; 680 snd_pcm_stream_lock_irq(substream); 681 switch (runtime->status->state) { 682 case SNDRV_PCM_STATE_OPEN: 683 case SNDRV_PCM_STATE_SETUP: 684 case SNDRV_PCM_STATE_PREPARED: 685 break; 686 default: 687 snd_pcm_stream_unlock_irq(substream); 688 return -EBADFD; 689 } 690 snd_pcm_stream_unlock_irq(substream); 691 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 692 if (!substream->oss.oss) 693 #endif 694 if (atomic_read(&substream->mmap_count)) 695 return -EBADFD; 696 697 params->rmask = ~0U; 698 err = snd_pcm_hw_refine(substream, params); 699 if (err < 0) 700 goto _error; 701 702 err = snd_pcm_hw_params_choose(substream, params); 703 if (err < 0) 704 goto _error; 705 706 err = fixup_unreferenced_params(substream, params); 707 if (err < 0) 708 goto _error; 709 710 if (substream->ops->hw_params != NULL) { 711 err = substream->ops->hw_params(substream, params); 712 if (err < 0) 713 goto _error; 714 } 715 716 runtime->access = params_access(params); 717 runtime->format = params_format(params); 718 runtime->subformat = params_subformat(params); 719 runtime->channels = params_channels(params); 720 runtime->rate = params_rate(params); 721 runtime->period_size = params_period_size(params); 722 runtime->periods = params_periods(params); 723 runtime->buffer_size = params_buffer_size(params); 724 runtime->info = params->info; 725 runtime->rate_num = params->rate_num; 726 runtime->rate_den = params->rate_den; 727 runtime->no_period_wakeup = 728 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 729 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 730 731 bits = snd_pcm_format_physical_width(runtime->format); 732 runtime->sample_bits = bits; 733 bits *= runtime->channels; 734 runtime->frame_bits = bits; 735 frames = 1; 736 while (bits % 8 != 0) { 737 bits *= 2; 738 frames *= 2; 739 } 740 runtime->byte_align = bits / 8; 741 runtime->min_align = frames; 742 743 /* Default sw params */ 744 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 745 runtime->period_step = 1; 746 runtime->control->avail_min = runtime->period_size; 747 runtime->start_threshold = 1; 748 runtime->stop_threshold = runtime->buffer_size; 749 runtime->silence_threshold = 0; 750 runtime->silence_size = 0; 751 runtime->boundary = runtime->buffer_size; 752 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 753 runtime->boundary *= 2; 754 755 snd_pcm_timer_resolution_change(substream); 756 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 757 758 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 759 pm_qos_remove_request(&substream->latency_pm_qos_req); 760 if ((usecs = period_to_usecs(runtime)) >= 0) 761 pm_qos_add_request(&substream->latency_pm_qos_req, 762 PM_QOS_CPU_DMA_LATENCY, usecs); 763 return 0; 764 _error: 765 /* hardware might be unusable from this time, 766 so we force application to retry to set 767 the correct hardware parameter settings */ 768 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 769 if (substream->ops->hw_free != NULL) 770 substream->ops->hw_free(substream); 771 return err; 772 } 773 774 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 775 struct snd_pcm_hw_params __user * _params) 776 { 777 struct snd_pcm_hw_params *params; 778 int err; 779 780 params = memdup_user(_params, sizeof(*params)); 781 if (IS_ERR(params)) 782 return PTR_ERR(params); 783 784 err = snd_pcm_hw_params(substream, params); 785 if (err < 0) 786 goto end; 787 788 if (copy_to_user(_params, params, sizeof(*params))) 789 err = -EFAULT; 790 end: 791 kfree(params); 792 return err; 793 } 794 795 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 796 { 797 struct snd_pcm_runtime *runtime; 798 int result = 0; 799 800 if (PCM_RUNTIME_CHECK(substream)) 801 return -ENXIO; 802 runtime = substream->runtime; 803 snd_pcm_stream_lock_irq(substream); 804 switch (runtime->status->state) { 805 case SNDRV_PCM_STATE_SETUP: 806 case SNDRV_PCM_STATE_PREPARED: 807 break; 808 default: 809 snd_pcm_stream_unlock_irq(substream); 810 return -EBADFD; 811 } 812 snd_pcm_stream_unlock_irq(substream); 813 if (atomic_read(&substream->mmap_count)) 814 return -EBADFD; 815 if (substream->ops->hw_free) 816 result = substream->ops->hw_free(substream); 817 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 818 pm_qos_remove_request(&substream->latency_pm_qos_req); 819 return result; 820 } 821 822 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 823 struct snd_pcm_sw_params *params) 824 { 825 struct snd_pcm_runtime *runtime; 826 int err; 827 828 if (PCM_RUNTIME_CHECK(substream)) 829 return -ENXIO; 830 runtime = substream->runtime; 831 snd_pcm_stream_lock_irq(substream); 832 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 833 snd_pcm_stream_unlock_irq(substream); 834 return -EBADFD; 835 } 836 snd_pcm_stream_unlock_irq(substream); 837 838 if (params->tstamp_mode < 0 || 839 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 840 return -EINVAL; 841 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 842 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 843 return -EINVAL; 844 if (params->avail_min == 0) 845 return -EINVAL; 846 if (params->silence_size >= runtime->boundary) { 847 if (params->silence_threshold != 0) 848 return -EINVAL; 849 } else { 850 if (params->silence_size > params->silence_threshold) 851 return -EINVAL; 852 if (params->silence_threshold > runtime->buffer_size) 853 return -EINVAL; 854 } 855 err = 0; 856 snd_pcm_stream_lock_irq(substream); 857 runtime->tstamp_mode = params->tstamp_mode; 858 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 859 runtime->tstamp_type = params->tstamp_type; 860 runtime->period_step = params->period_step; 861 runtime->control->avail_min = params->avail_min; 862 runtime->start_threshold = params->start_threshold; 863 runtime->stop_threshold = params->stop_threshold; 864 runtime->silence_threshold = params->silence_threshold; 865 runtime->silence_size = params->silence_size; 866 params->boundary = runtime->boundary; 867 if (snd_pcm_running(substream)) { 868 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 869 runtime->silence_size > 0) 870 snd_pcm_playback_silence(substream, ULONG_MAX); 871 err = snd_pcm_update_state(substream, runtime); 872 } 873 snd_pcm_stream_unlock_irq(substream); 874 return err; 875 } 876 877 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 878 struct snd_pcm_sw_params __user * _params) 879 { 880 struct snd_pcm_sw_params params; 881 int err; 882 if (copy_from_user(¶ms, _params, sizeof(params))) 883 return -EFAULT; 884 err = snd_pcm_sw_params(substream, ¶ms); 885 if (copy_to_user(_params, ¶ms, sizeof(params))) 886 return -EFAULT; 887 return err; 888 } 889 890 static inline snd_pcm_uframes_t 891 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 892 { 893 snd_pcm_uframes_t delay; 894 895 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 896 delay = snd_pcm_playback_hw_avail(substream->runtime); 897 else 898 delay = snd_pcm_capture_avail(substream->runtime); 899 return delay + substream->runtime->delay; 900 } 901 902 int snd_pcm_status(struct snd_pcm_substream *substream, 903 struct snd_pcm_status *status) 904 { 905 struct snd_pcm_runtime *runtime = substream->runtime; 906 907 snd_pcm_stream_lock_irq(substream); 908 909 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 910 &runtime->audio_tstamp_config); 911 912 /* backwards compatible behavior */ 913 if (runtime->audio_tstamp_config.type_requested == 914 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 915 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 916 runtime->audio_tstamp_config.type_requested = 917 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 918 else 919 runtime->audio_tstamp_config.type_requested = 920 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 921 runtime->audio_tstamp_report.valid = 0; 922 } else 923 runtime->audio_tstamp_report.valid = 1; 924 925 status->state = runtime->status->state; 926 status->suspended_state = runtime->status->suspended_state; 927 if (status->state == SNDRV_PCM_STATE_OPEN) 928 goto _end; 929 status->trigger_tstamp = runtime->trigger_tstamp; 930 if (snd_pcm_running(substream)) { 931 snd_pcm_update_hw_ptr(substream); 932 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 933 status->tstamp = runtime->status->tstamp; 934 status->driver_tstamp = runtime->driver_tstamp; 935 status->audio_tstamp = 936 runtime->status->audio_tstamp; 937 if (runtime->audio_tstamp_report.valid == 1) 938 /* backwards compatibility, no report provided in COMPAT mode */ 939 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 940 &status->audio_tstamp_accuracy, 941 &runtime->audio_tstamp_report); 942 943 goto _tstamp_end; 944 } 945 } else { 946 /* get tstamp only in fallback mode and only if enabled */ 947 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 948 snd_pcm_gettime(runtime, &status->tstamp); 949 } 950 _tstamp_end: 951 status->appl_ptr = runtime->control->appl_ptr; 952 status->hw_ptr = runtime->status->hw_ptr; 953 status->avail = snd_pcm_avail(substream); 954 status->delay = snd_pcm_running(substream) ? 955 snd_pcm_calc_delay(substream) : 0; 956 status->avail_max = runtime->avail_max; 957 status->overrange = runtime->overrange; 958 runtime->avail_max = 0; 959 runtime->overrange = 0; 960 _end: 961 snd_pcm_stream_unlock_irq(substream); 962 return 0; 963 } 964 965 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 966 struct snd_pcm_status __user * _status, 967 bool ext) 968 { 969 struct snd_pcm_status status; 970 int res; 971 972 memset(&status, 0, sizeof(status)); 973 /* 974 * with extension, parameters are read/write, 975 * get audio_tstamp_data from user, 976 * ignore rest of status structure 977 */ 978 if (ext && get_user(status.audio_tstamp_data, 979 (u32 __user *)(&_status->audio_tstamp_data))) 980 return -EFAULT; 981 res = snd_pcm_status(substream, &status); 982 if (res < 0) 983 return res; 984 if (copy_to_user(_status, &status, sizeof(status))) 985 return -EFAULT; 986 return 0; 987 } 988 989 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 990 struct snd_pcm_channel_info * info) 991 { 992 struct snd_pcm_runtime *runtime; 993 unsigned int channel; 994 995 channel = info->channel; 996 runtime = substream->runtime; 997 snd_pcm_stream_lock_irq(substream); 998 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 999 snd_pcm_stream_unlock_irq(substream); 1000 return -EBADFD; 1001 } 1002 snd_pcm_stream_unlock_irq(substream); 1003 if (channel >= runtime->channels) 1004 return -EINVAL; 1005 memset(info, 0, sizeof(*info)); 1006 info->channel = channel; 1007 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 1008 } 1009 1010 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 1011 struct snd_pcm_channel_info __user * _info) 1012 { 1013 struct snd_pcm_channel_info info; 1014 int res; 1015 1016 if (copy_from_user(&info, _info, sizeof(info))) 1017 return -EFAULT; 1018 res = snd_pcm_channel_info(substream, &info); 1019 if (res < 0) 1020 return res; 1021 if (copy_to_user(_info, &info, sizeof(info))) 1022 return -EFAULT; 1023 return 0; 1024 } 1025 1026 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 1027 { 1028 struct snd_pcm_runtime *runtime = substream->runtime; 1029 if (runtime->trigger_master == NULL) 1030 return; 1031 if (runtime->trigger_master == substream) { 1032 if (!runtime->trigger_tstamp_latched) 1033 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1034 } else { 1035 snd_pcm_trigger_tstamp(runtime->trigger_master); 1036 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1037 } 1038 runtime->trigger_master = NULL; 1039 } 1040 1041 struct action_ops { 1042 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1043 int (*do_action)(struct snd_pcm_substream *substream, int state); 1044 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1045 void (*post_action)(struct snd_pcm_substream *substream, int state); 1046 }; 1047 1048 /* 1049 * this functions is core for handling of linked stream 1050 * Note: the stream state might be changed also on failure 1051 * Note2: call with calling stream lock + link lock 1052 */ 1053 static int snd_pcm_action_group(const struct action_ops *ops, 1054 struct snd_pcm_substream *substream, 1055 int state, int do_lock) 1056 { 1057 struct snd_pcm_substream *s = NULL; 1058 struct snd_pcm_substream *s1; 1059 int res = 0, depth = 1; 1060 1061 snd_pcm_group_for_each_entry(s, substream) { 1062 if (do_lock && s != substream) { 1063 if (s->pcm->nonatomic) 1064 mutex_lock_nested(&s->self_group.mutex, depth); 1065 else 1066 spin_lock_nested(&s->self_group.lock, depth); 1067 depth++; 1068 } 1069 res = ops->pre_action(s, state); 1070 if (res < 0) 1071 goto _unlock; 1072 } 1073 snd_pcm_group_for_each_entry(s, substream) { 1074 res = ops->do_action(s, state); 1075 if (res < 0) { 1076 if (ops->undo_action) { 1077 snd_pcm_group_for_each_entry(s1, substream) { 1078 if (s1 == s) /* failed stream */ 1079 break; 1080 ops->undo_action(s1, state); 1081 } 1082 } 1083 s = NULL; /* unlock all */ 1084 goto _unlock; 1085 } 1086 } 1087 snd_pcm_group_for_each_entry(s, substream) { 1088 ops->post_action(s, state); 1089 } 1090 _unlock: 1091 if (do_lock) { 1092 /* unlock streams */ 1093 snd_pcm_group_for_each_entry(s1, substream) { 1094 if (s1 != substream) { 1095 if (s1->pcm->nonatomic) 1096 mutex_unlock(&s1->self_group.mutex); 1097 else 1098 spin_unlock(&s1->self_group.lock); 1099 } 1100 if (s1 == s) /* end */ 1101 break; 1102 } 1103 } 1104 return res; 1105 } 1106 1107 /* 1108 * Note: call with stream lock 1109 */ 1110 static int snd_pcm_action_single(const struct action_ops *ops, 1111 struct snd_pcm_substream *substream, 1112 int state) 1113 { 1114 int res; 1115 1116 res = ops->pre_action(substream, state); 1117 if (res < 0) 1118 return res; 1119 res = ops->do_action(substream, state); 1120 if (res == 0) 1121 ops->post_action(substream, state); 1122 else if (ops->undo_action) 1123 ops->undo_action(substream, state); 1124 return res; 1125 } 1126 1127 /* 1128 * Note: call with stream lock 1129 */ 1130 static int snd_pcm_action(const struct action_ops *ops, 1131 struct snd_pcm_substream *substream, 1132 int state) 1133 { 1134 int res; 1135 1136 if (!snd_pcm_stream_linked(substream)) 1137 return snd_pcm_action_single(ops, substream, state); 1138 1139 if (substream->pcm->nonatomic) { 1140 if (!mutex_trylock(&substream->group->mutex)) { 1141 mutex_unlock(&substream->self_group.mutex); 1142 mutex_lock(&substream->group->mutex); 1143 mutex_lock(&substream->self_group.mutex); 1144 } 1145 res = snd_pcm_action_group(ops, substream, state, 1); 1146 mutex_unlock(&substream->group->mutex); 1147 } else { 1148 if (!spin_trylock(&substream->group->lock)) { 1149 spin_unlock(&substream->self_group.lock); 1150 spin_lock(&substream->group->lock); 1151 spin_lock(&substream->self_group.lock); 1152 } 1153 res = snd_pcm_action_group(ops, substream, state, 1); 1154 spin_unlock(&substream->group->lock); 1155 } 1156 return res; 1157 } 1158 1159 /* 1160 * Note: don't use any locks before 1161 */ 1162 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1163 struct snd_pcm_substream *substream, 1164 int state) 1165 { 1166 int res; 1167 1168 snd_pcm_stream_lock_irq(substream); 1169 res = snd_pcm_action(ops, substream, state); 1170 snd_pcm_stream_unlock_irq(substream); 1171 return res; 1172 } 1173 1174 /* 1175 */ 1176 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1177 struct snd_pcm_substream *substream, 1178 int state) 1179 { 1180 int res; 1181 1182 down_read(&snd_pcm_link_rwsem); 1183 if (snd_pcm_stream_linked(substream)) 1184 res = snd_pcm_action_group(ops, substream, state, 0); 1185 else 1186 res = snd_pcm_action_single(ops, substream, state); 1187 up_read(&snd_pcm_link_rwsem); 1188 return res; 1189 } 1190 1191 /* 1192 * start callbacks 1193 */ 1194 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1195 { 1196 struct snd_pcm_runtime *runtime = substream->runtime; 1197 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1198 return -EBADFD; 1199 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1200 !snd_pcm_playback_data(substream)) 1201 return -EPIPE; 1202 runtime->trigger_tstamp_latched = false; 1203 runtime->trigger_master = substream; 1204 return 0; 1205 } 1206 1207 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1208 { 1209 if (substream->runtime->trigger_master != substream) 1210 return 0; 1211 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1212 } 1213 1214 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1215 { 1216 if (substream->runtime->trigger_master == substream) 1217 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1218 } 1219 1220 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1221 { 1222 struct snd_pcm_runtime *runtime = substream->runtime; 1223 snd_pcm_trigger_tstamp(substream); 1224 runtime->hw_ptr_jiffies = jiffies; 1225 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1226 runtime->rate; 1227 runtime->status->state = state; 1228 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1229 runtime->silence_size > 0) 1230 snd_pcm_playback_silence(substream, ULONG_MAX); 1231 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1232 } 1233 1234 static const struct action_ops snd_pcm_action_start = { 1235 .pre_action = snd_pcm_pre_start, 1236 .do_action = snd_pcm_do_start, 1237 .undo_action = snd_pcm_undo_start, 1238 .post_action = snd_pcm_post_start 1239 }; 1240 1241 /** 1242 * snd_pcm_start - start all linked streams 1243 * @substream: the PCM substream instance 1244 * 1245 * Return: Zero if successful, or a negative error code. 1246 * The stream lock must be acquired before calling this function. 1247 */ 1248 int snd_pcm_start(struct snd_pcm_substream *substream) 1249 { 1250 return snd_pcm_action(&snd_pcm_action_start, substream, 1251 SNDRV_PCM_STATE_RUNNING); 1252 } 1253 1254 /* take the stream lock and start the streams */ 1255 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1256 { 1257 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1258 SNDRV_PCM_STATE_RUNNING); 1259 } 1260 1261 /* 1262 * stop callbacks 1263 */ 1264 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1265 { 1266 struct snd_pcm_runtime *runtime = substream->runtime; 1267 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1268 return -EBADFD; 1269 runtime->trigger_master = substream; 1270 return 0; 1271 } 1272 1273 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1274 { 1275 if (substream->runtime->trigger_master == substream && 1276 snd_pcm_running(substream)) 1277 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1278 return 0; /* unconditonally stop all substreams */ 1279 } 1280 1281 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1282 { 1283 struct snd_pcm_runtime *runtime = substream->runtime; 1284 if (runtime->status->state != state) { 1285 snd_pcm_trigger_tstamp(substream); 1286 runtime->status->state = state; 1287 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1288 } 1289 wake_up(&runtime->sleep); 1290 wake_up(&runtime->tsleep); 1291 } 1292 1293 static const struct action_ops snd_pcm_action_stop = { 1294 .pre_action = snd_pcm_pre_stop, 1295 .do_action = snd_pcm_do_stop, 1296 .post_action = snd_pcm_post_stop 1297 }; 1298 1299 /** 1300 * snd_pcm_stop - try to stop all running streams in the substream group 1301 * @substream: the PCM substream instance 1302 * @state: PCM state after stopping the stream 1303 * 1304 * The state of each stream is then changed to the given state unconditionally. 1305 * 1306 * Return: Zero if successful, or a negative error code. 1307 */ 1308 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1309 { 1310 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1311 } 1312 EXPORT_SYMBOL(snd_pcm_stop); 1313 1314 /** 1315 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1316 * @substream: the PCM substream 1317 * 1318 * After stopping, the state is changed to SETUP. 1319 * Unlike snd_pcm_stop(), this affects only the given stream. 1320 * 1321 * Return: Zero if succesful, or a negative error code. 1322 */ 1323 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1324 { 1325 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1326 SNDRV_PCM_STATE_SETUP); 1327 } 1328 1329 /** 1330 * snd_pcm_stop_xrun - stop the running streams as XRUN 1331 * @substream: the PCM substream instance 1332 * 1333 * This stops the given running substream (and all linked substreams) as XRUN. 1334 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1335 * 1336 * Return: Zero if successful, or a negative error code. 1337 */ 1338 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1339 { 1340 unsigned long flags; 1341 1342 snd_pcm_stream_lock_irqsave(substream, flags); 1343 if (substream->runtime && snd_pcm_running(substream)) 1344 __snd_pcm_xrun(substream); 1345 snd_pcm_stream_unlock_irqrestore(substream, flags); 1346 return 0; 1347 } 1348 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1349 1350 /* 1351 * pause callbacks 1352 */ 1353 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1354 { 1355 struct snd_pcm_runtime *runtime = substream->runtime; 1356 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1357 return -ENOSYS; 1358 if (push) { 1359 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1360 return -EBADFD; 1361 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1362 return -EBADFD; 1363 runtime->trigger_master = substream; 1364 return 0; 1365 } 1366 1367 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1368 { 1369 if (substream->runtime->trigger_master != substream) 1370 return 0; 1371 /* some drivers might use hw_ptr to recover from the pause - 1372 update the hw_ptr now */ 1373 if (push) 1374 snd_pcm_update_hw_ptr(substream); 1375 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1376 * a delta between the current jiffies, this gives a large enough 1377 * delta, effectively to skip the check once. 1378 */ 1379 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1380 return substream->ops->trigger(substream, 1381 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1382 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1383 } 1384 1385 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1386 { 1387 if (substream->runtime->trigger_master == substream) 1388 substream->ops->trigger(substream, 1389 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1390 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1391 } 1392 1393 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1394 { 1395 struct snd_pcm_runtime *runtime = substream->runtime; 1396 snd_pcm_trigger_tstamp(substream); 1397 if (push) { 1398 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1399 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1400 wake_up(&runtime->sleep); 1401 wake_up(&runtime->tsleep); 1402 } else { 1403 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1404 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1405 } 1406 } 1407 1408 static const struct action_ops snd_pcm_action_pause = { 1409 .pre_action = snd_pcm_pre_pause, 1410 .do_action = snd_pcm_do_pause, 1411 .undo_action = snd_pcm_undo_pause, 1412 .post_action = snd_pcm_post_pause 1413 }; 1414 1415 /* 1416 * Push/release the pause for all linked streams. 1417 */ 1418 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1419 { 1420 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1421 } 1422 1423 #ifdef CONFIG_PM 1424 /* suspend */ 1425 1426 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1427 { 1428 struct snd_pcm_runtime *runtime = substream->runtime; 1429 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1430 return -EBUSY; 1431 runtime->trigger_master = substream; 1432 return 0; 1433 } 1434 1435 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1436 { 1437 struct snd_pcm_runtime *runtime = substream->runtime; 1438 if (runtime->trigger_master != substream) 1439 return 0; 1440 if (! snd_pcm_running(substream)) 1441 return 0; 1442 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1443 return 0; /* suspend unconditionally */ 1444 } 1445 1446 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1447 { 1448 struct snd_pcm_runtime *runtime = substream->runtime; 1449 snd_pcm_trigger_tstamp(substream); 1450 runtime->status->suspended_state = runtime->status->state; 1451 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1452 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1453 wake_up(&runtime->sleep); 1454 wake_up(&runtime->tsleep); 1455 } 1456 1457 static const struct action_ops snd_pcm_action_suspend = { 1458 .pre_action = snd_pcm_pre_suspend, 1459 .do_action = snd_pcm_do_suspend, 1460 .post_action = snd_pcm_post_suspend 1461 }; 1462 1463 /* 1464 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1465 * @substream: the PCM substream 1466 * 1467 * After this call, all streams are changed to SUSPENDED state. 1468 * 1469 * Return: Zero if successful, or a negative error code. 1470 */ 1471 static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1472 { 1473 int err; 1474 unsigned long flags; 1475 1476 snd_pcm_stream_lock_irqsave(substream, flags); 1477 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1478 snd_pcm_stream_unlock_irqrestore(substream, flags); 1479 return err; 1480 } 1481 1482 /** 1483 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1484 * @pcm: the PCM instance 1485 * 1486 * After this call, all streams are changed to SUSPENDED state. 1487 * 1488 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1489 */ 1490 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1491 { 1492 struct snd_pcm_substream *substream; 1493 int stream, err = 0; 1494 1495 if (! pcm) 1496 return 0; 1497 1498 for (stream = 0; stream < 2; stream++) { 1499 for (substream = pcm->streams[stream].substream; 1500 substream; substream = substream->next) { 1501 /* FIXME: the open/close code should lock this as well */ 1502 if (substream->runtime == NULL) 1503 continue; 1504 err = snd_pcm_suspend(substream); 1505 if (err < 0 && err != -EBUSY) 1506 return err; 1507 } 1508 } 1509 return 0; 1510 } 1511 EXPORT_SYMBOL(snd_pcm_suspend_all); 1512 1513 /* resume */ 1514 1515 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1516 { 1517 struct snd_pcm_runtime *runtime = substream->runtime; 1518 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1519 return -ENOSYS; 1520 runtime->trigger_master = substream; 1521 return 0; 1522 } 1523 1524 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1525 { 1526 struct snd_pcm_runtime *runtime = substream->runtime; 1527 if (runtime->trigger_master != substream) 1528 return 0; 1529 /* DMA not running previously? */ 1530 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1531 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1532 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1533 return 0; 1534 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1535 } 1536 1537 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1538 { 1539 if (substream->runtime->trigger_master == substream && 1540 snd_pcm_running(substream)) 1541 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1542 } 1543 1544 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1545 { 1546 struct snd_pcm_runtime *runtime = substream->runtime; 1547 snd_pcm_trigger_tstamp(substream); 1548 runtime->status->state = runtime->status->suspended_state; 1549 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1550 } 1551 1552 static const struct action_ops snd_pcm_action_resume = { 1553 .pre_action = snd_pcm_pre_resume, 1554 .do_action = snd_pcm_do_resume, 1555 .undo_action = snd_pcm_undo_resume, 1556 .post_action = snd_pcm_post_resume 1557 }; 1558 1559 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1560 { 1561 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1562 } 1563 1564 #else 1565 1566 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1567 { 1568 return -ENOSYS; 1569 } 1570 1571 #endif /* CONFIG_PM */ 1572 1573 /* 1574 * xrun ioctl 1575 * 1576 * Change the RUNNING stream(s) to XRUN state. 1577 */ 1578 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1579 { 1580 struct snd_pcm_runtime *runtime = substream->runtime; 1581 int result; 1582 1583 snd_pcm_stream_lock_irq(substream); 1584 switch (runtime->status->state) { 1585 case SNDRV_PCM_STATE_XRUN: 1586 result = 0; /* already there */ 1587 break; 1588 case SNDRV_PCM_STATE_RUNNING: 1589 __snd_pcm_xrun(substream); 1590 result = 0; 1591 break; 1592 default: 1593 result = -EBADFD; 1594 } 1595 snd_pcm_stream_unlock_irq(substream); 1596 return result; 1597 } 1598 1599 /* 1600 * reset ioctl 1601 */ 1602 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1603 { 1604 struct snd_pcm_runtime *runtime = substream->runtime; 1605 switch (runtime->status->state) { 1606 case SNDRV_PCM_STATE_RUNNING: 1607 case SNDRV_PCM_STATE_PREPARED: 1608 case SNDRV_PCM_STATE_PAUSED: 1609 case SNDRV_PCM_STATE_SUSPENDED: 1610 return 0; 1611 default: 1612 return -EBADFD; 1613 } 1614 } 1615 1616 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1617 { 1618 struct snd_pcm_runtime *runtime = substream->runtime; 1619 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1620 if (err < 0) 1621 return err; 1622 runtime->hw_ptr_base = 0; 1623 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1624 runtime->status->hw_ptr % runtime->period_size; 1625 runtime->silence_start = runtime->status->hw_ptr; 1626 runtime->silence_filled = 0; 1627 return 0; 1628 } 1629 1630 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1631 { 1632 struct snd_pcm_runtime *runtime = substream->runtime; 1633 runtime->control->appl_ptr = runtime->status->hw_ptr; 1634 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1635 runtime->silence_size > 0) 1636 snd_pcm_playback_silence(substream, ULONG_MAX); 1637 } 1638 1639 static const struct action_ops snd_pcm_action_reset = { 1640 .pre_action = snd_pcm_pre_reset, 1641 .do_action = snd_pcm_do_reset, 1642 .post_action = snd_pcm_post_reset 1643 }; 1644 1645 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1646 { 1647 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1648 } 1649 1650 /* 1651 * prepare ioctl 1652 */ 1653 /* we use the second argument for updating f_flags */ 1654 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1655 int f_flags) 1656 { 1657 struct snd_pcm_runtime *runtime = substream->runtime; 1658 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1659 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1660 return -EBADFD; 1661 if (snd_pcm_running(substream)) 1662 return -EBUSY; 1663 substream->f_flags = f_flags; 1664 return 0; 1665 } 1666 1667 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1668 { 1669 int err; 1670 err = substream->ops->prepare(substream); 1671 if (err < 0) 1672 return err; 1673 return snd_pcm_do_reset(substream, 0); 1674 } 1675 1676 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1677 { 1678 struct snd_pcm_runtime *runtime = substream->runtime; 1679 runtime->control->appl_ptr = runtime->status->hw_ptr; 1680 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1681 } 1682 1683 static const struct action_ops snd_pcm_action_prepare = { 1684 .pre_action = snd_pcm_pre_prepare, 1685 .do_action = snd_pcm_do_prepare, 1686 .post_action = snd_pcm_post_prepare 1687 }; 1688 1689 /** 1690 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1691 * @substream: the PCM substream instance 1692 * @file: file to refer f_flags 1693 * 1694 * Return: Zero if successful, or a negative error code. 1695 */ 1696 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1697 struct file *file) 1698 { 1699 int f_flags; 1700 1701 if (file) 1702 f_flags = file->f_flags; 1703 else 1704 f_flags = substream->f_flags; 1705 1706 snd_pcm_stream_lock_irq(substream); 1707 switch (substream->runtime->status->state) { 1708 case SNDRV_PCM_STATE_PAUSED: 1709 snd_pcm_pause(substream, 0); 1710 /* fallthru */ 1711 case SNDRV_PCM_STATE_SUSPENDED: 1712 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1713 break; 1714 } 1715 snd_pcm_stream_unlock_irq(substream); 1716 1717 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1718 substream, f_flags); 1719 } 1720 1721 /* 1722 * drain ioctl 1723 */ 1724 1725 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1726 { 1727 struct snd_pcm_runtime *runtime = substream->runtime; 1728 switch (runtime->status->state) { 1729 case SNDRV_PCM_STATE_OPEN: 1730 case SNDRV_PCM_STATE_DISCONNECTED: 1731 case SNDRV_PCM_STATE_SUSPENDED: 1732 return -EBADFD; 1733 } 1734 runtime->trigger_master = substream; 1735 return 0; 1736 } 1737 1738 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1739 { 1740 struct snd_pcm_runtime *runtime = substream->runtime; 1741 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1742 switch (runtime->status->state) { 1743 case SNDRV_PCM_STATE_PREPARED: 1744 /* start playback stream if possible */ 1745 if (! snd_pcm_playback_empty(substream)) { 1746 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1747 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1748 } else { 1749 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1750 } 1751 break; 1752 case SNDRV_PCM_STATE_RUNNING: 1753 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1754 break; 1755 case SNDRV_PCM_STATE_XRUN: 1756 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1757 break; 1758 default: 1759 break; 1760 } 1761 } else { 1762 /* stop running stream */ 1763 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1764 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1765 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1766 snd_pcm_do_stop(substream, new_state); 1767 snd_pcm_post_stop(substream, new_state); 1768 } 1769 } 1770 1771 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1772 runtime->trigger_master == substream && 1773 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1774 return substream->ops->trigger(substream, 1775 SNDRV_PCM_TRIGGER_DRAIN); 1776 1777 return 0; 1778 } 1779 1780 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1781 { 1782 } 1783 1784 static const struct action_ops snd_pcm_action_drain_init = { 1785 .pre_action = snd_pcm_pre_drain_init, 1786 .do_action = snd_pcm_do_drain_init, 1787 .post_action = snd_pcm_post_drain_init 1788 }; 1789 1790 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1791 1792 /* 1793 * Drain the stream(s). 1794 * When the substream is linked, sync until the draining of all playback streams 1795 * is finished. 1796 * After this call, all streams are supposed to be either SETUP or DRAINING 1797 * (capture only) state. 1798 */ 1799 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1800 struct file *file) 1801 { 1802 struct snd_card *card; 1803 struct snd_pcm_runtime *runtime; 1804 struct snd_pcm_substream *s; 1805 wait_queue_entry_t wait; 1806 int result = 0; 1807 int nonblock = 0; 1808 1809 card = substream->pcm->card; 1810 runtime = substream->runtime; 1811 1812 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1813 return -EBADFD; 1814 1815 if (file) { 1816 if (file->f_flags & O_NONBLOCK) 1817 nonblock = 1; 1818 } else if (substream->f_flags & O_NONBLOCK) 1819 nonblock = 1; 1820 1821 down_read(&snd_pcm_link_rwsem); 1822 snd_pcm_stream_lock_irq(substream); 1823 /* resume pause */ 1824 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1825 snd_pcm_pause(substream, 0); 1826 1827 /* pre-start/stop - all running streams are changed to DRAINING state */ 1828 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1829 if (result < 0) 1830 goto unlock; 1831 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1832 if (nonblock) { 1833 result = -EAGAIN; 1834 goto unlock; 1835 } 1836 1837 for (;;) { 1838 long tout; 1839 struct snd_pcm_runtime *to_check; 1840 if (signal_pending(current)) { 1841 result = -ERESTARTSYS; 1842 break; 1843 } 1844 /* find a substream to drain */ 1845 to_check = NULL; 1846 snd_pcm_group_for_each_entry(s, substream) { 1847 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1848 continue; 1849 runtime = s->runtime; 1850 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1851 to_check = runtime; 1852 break; 1853 } 1854 } 1855 if (!to_check) 1856 break; /* all drained */ 1857 init_waitqueue_entry(&wait, current); 1858 add_wait_queue(&to_check->sleep, &wait); 1859 snd_pcm_stream_unlock_irq(substream); 1860 up_read(&snd_pcm_link_rwsem); 1861 if (runtime->no_period_wakeup) 1862 tout = MAX_SCHEDULE_TIMEOUT; 1863 else { 1864 tout = 10; 1865 if (runtime->rate) { 1866 long t = runtime->period_size * 2 / runtime->rate; 1867 tout = max(t, tout); 1868 } 1869 tout = msecs_to_jiffies(tout * 1000); 1870 } 1871 tout = schedule_timeout_interruptible(tout); 1872 down_read(&snd_pcm_link_rwsem); 1873 snd_pcm_stream_lock_irq(substream); 1874 remove_wait_queue(&to_check->sleep, &wait); 1875 if (card->shutdown) { 1876 result = -ENODEV; 1877 break; 1878 } 1879 if (tout == 0) { 1880 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1881 result = -ESTRPIPE; 1882 else { 1883 dev_dbg(substream->pcm->card->dev, 1884 "playback drain error (DMA or IRQ trouble?)\n"); 1885 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1886 result = -EIO; 1887 } 1888 break; 1889 } 1890 } 1891 1892 unlock: 1893 snd_pcm_stream_unlock_irq(substream); 1894 up_read(&snd_pcm_link_rwsem); 1895 1896 return result; 1897 } 1898 1899 /* 1900 * drop ioctl 1901 * 1902 * Immediately put all linked substreams into SETUP state. 1903 */ 1904 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1905 { 1906 struct snd_pcm_runtime *runtime; 1907 int result = 0; 1908 1909 if (PCM_RUNTIME_CHECK(substream)) 1910 return -ENXIO; 1911 runtime = substream->runtime; 1912 1913 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1914 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1915 return -EBADFD; 1916 1917 snd_pcm_stream_lock_irq(substream); 1918 /* resume pause */ 1919 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1920 snd_pcm_pause(substream, 0); 1921 1922 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1923 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1924 snd_pcm_stream_unlock_irq(substream); 1925 1926 return result; 1927 } 1928 1929 1930 static bool is_pcm_file(struct file *file) 1931 { 1932 struct inode *inode = file_inode(file); 1933 unsigned int minor; 1934 1935 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1936 return false; 1937 minor = iminor(inode); 1938 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1939 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1940 } 1941 1942 /* 1943 * PCM link handling 1944 */ 1945 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1946 { 1947 int res = 0; 1948 struct snd_pcm_file *pcm_file; 1949 struct snd_pcm_substream *substream1; 1950 struct snd_pcm_group *group; 1951 struct fd f = fdget(fd); 1952 1953 if (!f.file) 1954 return -EBADFD; 1955 if (!is_pcm_file(f.file)) { 1956 res = -EBADFD; 1957 goto _badf; 1958 } 1959 pcm_file = f.file->private_data; 1960 substream1 = pcm_file->substream; 1961 group = kmalloc(sizeof(*group), GFP_KERNEL); 1962 if (!group) { 1963 res = -ENOMEM; 1964 goto _nolock; 1965 } 1966 down_write_nonfifo(&snd_pcm_link_rwsem); 1967 write_lock_irq(&snd_pcm_link_rwlock); 1968 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1969 substream->runtime->status->state != substream1->runtime->status->state || 1970 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1971 res = -EBADFD; 1972 goto _end; 1973 } 1974 if (snd_pcm_stream_linked(substream1)) { 1975 res = -EALREADY; 1976 goto _end; 1977 } 1978 if (!snd_pcm_stream_linked(substream)) { 1979 substream->group = group; 1980 group = NULL; 1981 spin_lock_init(&substream->group->lock); 1982 mutex_init(&substream->group->mutex); 1983 INIT_LIST_HEAD(&substream->group->substreams); 1984 list_add_tail(&substream->link_list, &substream->group->substreams); 1985 substream->group->count = 1; 1986 } 1987 list_add_tail(&substream1->link_list, &substream->group->substreams); 1988 substream->group->count++; 1989 substream1->group = substream->group; 1990 _end: 1991 write_unlock_irq(&snd_pcm_link_rwlock); 1992 up_write(&snd_pcm_link_rwsem); 1993 _nolock: 1994 snd_card_unref(substream1->pcm->card); 1995 kfree(group); 1996 _badf: 1997 fdput(f); 1998 return res; 1999 } 2000 2001 static void relink_to_local(struct snd_pcm_substream *substream) 2002 { 2003 substream->group = &substream->self_group; 2004 INIT_LIST_HEAD(&substream->self_group.substreams); 2005 list_add_tail(&substream->link_list, &substream->self_group.substreams); 2006 } 2007 2008 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2009 { 2010 struct snd_pcm_substream *s; 2011 int res = 0; 2012 2013 down_write_nonfifo(&snd_pcm_link_rwsem); 2014 write_lock_irq(&snd_pcm_link_rwlock); 2015 if (!snd_pcm_stream_linked(substream)) { 2016 res = -EALREADY; 2017 goto _end; 2018 } 2019 list_del(&substream->link_list); 2020 substream->group->count--; 2021 if (substream->group->count == 1) { /* detach the last stream, too */ 2022 snd_pcm_group_for_each_entry(s, substream) { 2023 relink_to_local(s); 2024 break; 2025 } 2026 kfree(substream->group); 2027 } 2028 relink_to_local(substream); 2029 _end: 2030 write_unlock_irq(&snd_pcm_link_rwlock); 2031 up_write(&snd_pcm_link_rwsem); 2032 return res; 2033 } 2034 2035 /* 2036 * hw configurator 2037 */ 2038 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2039 struct snd_pcm_hw_rule *rule) 2040 { 2041 struct snd_interval t; 2042 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2043 hw_param_interval_c(params, rule->deps[1]), &t); 2044 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2045 } 2046 2047 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2048 struct snd_pcm_hw_rule *rule) 2049 { 2050 struct snd_interval t; 2051 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2052 hw_param_interval_c(params, rule->deps[1]), &t); 2053 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2054 } 2055 2056 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2057 struct snd_pcm_hw_rule *rule) 2058 { 2059 struct snd_interval t; 2060 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2061 hw_param_interval_c(params, rule->deps[1]), 2062 (unsigned long) rule->private, &t); 2063 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2064 } 2065 2066 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2067 struct snd_pcm_hw_rule *rule) 2068 { 2069 struct snd_interval t; 2070 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2071 (unsigned long) rule->private, 2072 hw_param_interval_c(params, rule->deps[1]), &t); 2073 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2074 } 2075 2076 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2077 struct snd_pcm_hw_rule *rule) 2078 { 2079 unsigned int k; 2080 const struct snd_interval *i = 2081 hw_param_interval_c(params, rule->deps[0]); 2082 struct snd_mask m; 2083 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2084 snd_mask_any(&m); 2085 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2086 int bits; 2087 if (! snd_mask_test(mask, k)) 2088 continue; 2089 bits = snd_pcm_format_physical_width(k); 2090 if (bits <= 0) 2091 continue; /* ignore invalid formats */ 2092 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2093 snd_mask_reset(&m, k); 2094 } 2095 return snd_mask_refine(mask, &m); 2096 } 2097 2098 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2099 struct snd_pcm_hw_rule *rule) 2100 { 2101 struct snd_interval t; 2102 unsigned int k; 2103 t.min = UINT_MAX; 2104 t.max = 0; 2105 t.openmin = 0; 2106 t.openmax = 0; 2107 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2108 int bits; 2109 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2110 continue; 2111 bits = snd_pcm_format_physical_width(k); 2112 if (bits <= 0) 2113 continue; /* ignore invalid formats */ 2114 if (t.min > (unsigned)bits) 2115 t.min = bits; 2116 if (t.max < (unsigned)bits) 2117 t.max = bits; 2118 } 2119 t.integer = 1; 2120 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2121 } 2122 2123 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2124 #error "Change this table" 2125 #endif 2126 2127 static const unsigned int rates[] = { 2128 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2129 48000, 64000, 88200, 96000, 176400, 192000 2130 }; 2131 2132 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2133 .count = ARRAY_SIZE(rates), 2134 .list = rates, 2135 }; 2136 2137 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2138 struct snd_pcm_hw_rule *rule) 2139 { 2140 struct snd_pcm_hardware *hw = rule->private; 2141 return snd_interval_list(hw_param_interval(params, rule->var), 2142 snd_pcm_known_rates.count, 2143 snd_pcm_known_rates.list, hw->rates); 2144 } 2145 2146 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2147 struct snd_pcm_hw_rule *rule) 2148 { 2149 struct snd_interval t; 2150 struct snd_pcm_substream *substream = rule->private; 2151 t.min = 0; 2152 t.max = substream->buffer_bytes_max; 2153 t.openmin = 0; 2154 t.openmax = 0; 2155 t.integer = 1; 2156 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2157 } 2158 2159 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2160 { 2161 struct snd_pcm_runtime *runtime = substream->runtime; 2162 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2163 int k, err; 2164 2165 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2166 snd_mask_any(constrs_mask(constrs, k)); 2167 } 2168 2169 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2170 snd_interval_any(constrs_interval(constrs, k)); 2171 } 2172 2173 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2174 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2175 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2176 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2177 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2178 2179 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2180 snd_pcm_hw_rule_format, NULL, 2181 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2182 if (err < 0) 2183 return err; 2184 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2185 snd_pcm_hw_rule_sample_bits, NULL, 2186 SNDRV_PCM_HW_PARAM_FORMAT, 2187 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2188 if (err < 0) 2189 return err; 2190 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2191 snd_pcm_hw_rule_div, NULL, 2192 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2193 if (err < 0) 2194 return err; 2195 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2196 snd_pcm_hw_rule_mul, NULL, 2197 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2198 if (err < 0) 2199 return err; 2200 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2201 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2202 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2203 if (err < 0) 2204 return err; 2205 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2206 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2207 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2208 if (err < 0) 2209 return err; 2210 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2211 snd_pcm_hw_rule_div, NULL, 2212 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2213 if (err < 0) 2214 return err; 2215 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2216 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2217 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2218 if (err < 0) 2219 return err; 2220 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2221 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2222 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2223 if (err < 0) 2224 return err; 2225 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2226 snd_pcm_hw_rule_div, NULL, 2227 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2228 if (err < 0) 2229 return err; 2230 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2231 snd_pcm_hw_rule_div, NULL, 2232 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2233 if (err < 0) 2234 return err; 2235 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2236 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2237 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 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_SIZE, 2241 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2242 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 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_SIZE, 2246 snd_pcm_hw_rule_mul, NULL, 2247 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2248 if (err < 0) 2249 return err; 2250 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2251 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2252 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2253 if (err < 0) 2254 return err; 2255 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2256 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2257 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2258 if (err < 0) 2259 return err; 2260 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2261 snd_pcm_hw_rule_muldivk, (void*) 8, 2262 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2263 if (err < 0) 2264 return err; 2265 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2266 snd_pcm_hw_rule_muldivk, (void*) 8, 2267 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2268 if (err < 0) 2269 return err; 2270 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2271 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2272 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2273 if (err < 0) 2274 return err; 2275 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2276 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2277 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2278 if (err < 0) 2279 return err; 2280 return 0; 2281 } 2282 2283 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2284 { 2285 struct snd_pcm_runtime *runtime = substream->runtime; 2286 struct snd_pcm_hardware *hw = &runtime->hw; 2287 int err; 2288 unsigned int mask = 0; 2289 2290 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2291 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2292 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2293 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2294 if (hw_support_mmap(substream)) { 2295 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2296 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2297 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2298 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2299 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2300 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2301 } 2302 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2303 if (err < 0) 2304 return err; 2305 2306 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2307 if (err < 0) 2308 return err; 2309 2310 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2311 if (err < 0) 2312 return err; 2313 2314 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2315 hw->channels_min, hw->channels_max); 2316 if (err < 0) 2317 return err; 2318 2319 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2320 hw->rate_min, hw->rate_max); 2321 if (err < 0) 2322 return err; 2323 2324 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2325 hw->period_bytes_min, hw->period_bytes_max); 2326 if (err < 0) 2327 return err; 2328 2329 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2330 hw->periods_min, hw->periods_max); 2331 if (err < 0) 2332 return err; 2333 2334 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2335 hw->period_bytes_min, hw->buffer_bytes_max); 2336 if (err < 0) 2337 return err; 2338 2339 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2340 snd_pcm_hw_rule_buffer_bytes_max, substream, 2341 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2342 if (err < 0) 2343 return err; 2344 2345 /* FIXME: remove */ 2346 if (runtime->dma_bytes) { 2347 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2348 if (err < 0) 2349 return err; 2350 } 2351 2352 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2353 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2354 snd_pcm_hw_rule_rate, hw, 2355 SNDRV_PCM_HW_PARAM_RATE, -1); 2356 if (err < 0) 2357 return err; 2358 } 2359 2360 /* FIXME: this belong to lowlevel */ 2361 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2362 2363 return 0; 2364 } 2365 2366 static void pcm_release_private(struct snd_pcm_substream *substream) 2367 { 2368 if (snd_pcm_stream_linked(substream)) 2369 snd_pcm_unlink(substream); 2370 } 2371 2372 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2373 { 2374 substream->ref_count--; 2375 if (substream->ref_count > 0) 2376 return; 2377 2378 snd_pcm_drop(substream); 2379 if (substream->hw_opened) { 2380 if (substream->ops->hw_free && 2381 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2382 substream->ops->hw_free(substream); 2383 substream->ops->close(substream); 2384 substream->hw_opened = 0; 2385 } 2386 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2387 pm_qos_remove_request(&substream->latency_pm_qos_req); 2388 if (substream->pcm_release) { 2389 substream->pcm_release(substream); 2390 substream->pcm_release = NULL; 2391 } 2392 snd_pcm_detach_substream(substream); 2393 } 2394 EXPORT_SYMBOL(snd_pcm_release_substream); 2395 2396 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2397 struct file *file, 2398 struct snd_pcm_substream **rsubstream) 2399 { 2400 struct snd_pcm_substream *substream; 2401 int err; 2402 2403 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2404 if (err < 0) 2405 return err; 2406 if (substream->ref_count > 1) { 2407 *rsubstream = substream; 2408 return 0; 2409 } 2410 2411 err = snd_pcm_hw_constraints_init(substream); 2412 if (err < 0) { 2413 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2414 goto error; 2415 } 2416 2417 if ((err = substream->ops->open(substream)) < 0) 2418 goto error; 2419 2420 substream->hw_opened = 1; 2421 2422 err = snd_pcm_hw_constraints_complete(substream); 2423 if (err < 0) { 2424 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2425 goto error; 2426 } 2427 2428 *rsubstream = substream; 2429 return 0; 2430 2431 error: 2432 snd_pcm_release_substream(substream); 2433 return err; 2434 } 2435 EXPORT_SYMBOL(snd_pcm_open_substream); 2436 2437 static int snd_pcm_open_file(struct file *file, 2438 struct snd_pcm *pcm, 2439 int stream) 2440 { 2441 struct snd_pcm_file *pcm_file; 2442 struct snd_pcm_substream *substream; 2443 int err; 2444 2445 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2446 if (err < 0) 2447 return err; 2448 2449 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2450 if (pcm_file == NULL) { 2451 snd_pcm_release_substream(substream); 2452 return -ENOMEM; 2453 } 2454 pcm_file->substream = substream; 2455 if (substream->ref_count == 1) { 2456 substream->file = pcm_file; 2457 substream->pcm_release = pcm_release_private; 2458 } 2459 file->private_data = pcm_file; 2460 2461 return 0; 2462 } 2463 2464 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2465 { 2466 struct snd_pcm *pcm; 2467 int err = nonseekable_open(inode, file); 2468 if (err < 0) 2469 return err; 2470 pcm = snd_lookup_minor_data(iminor(inode), 2471 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2472 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2473 if (pcm) 2474 snd_card_unref(pcm->card); 2475 return err; 2476 } 2477 2478 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2479 { 2480 struct snd_pcm *pcm; 2481 int err = nonseekable_open(inode, file); 2482 if (err < 0) 2483 return err; 2484 pcm = snd_lookup_minor_data(iminor(inode), 2485 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2486 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2487 if (pcm) 2488 snd_card_unref(pcm->card); 2489 return err; 2490 } 2491 2492 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2493 { 2494 int err; 2495 wait_queue_entry_t wait; 2496 2497 if (pcm == NULL) { 2498 err = -ENODEV; 2499 goto __error1; 2500 } 2501 err = snd_card_file_add(pcm->card, file); 2502 if (err < 0) 2503 goto __error1; 2504 if (!try_module_get(pcm->card->module)) { 2505 err = -EFAULT; 2506 goto __error2; 2507 } 2508 init_waitqueue_entry(&wait, current); 2509 add_wait_queue(&pcm->open_wait, &wait); 2510 mutex_lock(&pcm->open_mutex); 2511 while (1) { 2512 err = snd_pcm_open_file(file, pcm, stream); 2513 if (err >= 0) 2514 break; 2515 if (err == -EAGAIN) { 2516 if (file->f_flags & O_NONBLOCK) { 2517 err = -EBUSY; 2518 break; 2519 } 2520 } else 2521 break; 2522 set_current_state(TASK_INTERRUPTIBLE); 2523 mutex_unlock(&pcm->open_mutex); 2524 schedule(); 2525 mutex_lock(&pcm->open_mutex); 2526 if (pcm->card->shutdown) { 2527 err = -ENODEV; 2528 break; 2529 } 2530 if (signal_pending(current)) { 2531 err = -ERESTARTSYS; 2532 break; 2533 } 2534 } 2535 remove_wait_queue(&pcm->open_wait, &wait); 2536 mutex_unlock(&pcm->open_mutex); 2537 if (err < 0) 2538 goto __error; 2539 return err; 2540 2541 __error: 2542 module_put(pcm->card->module); 2543 __error2: 2544 snd_card_file_remove(pcm->card, file); 2545 __error1: 2546 return err; 2547 } 2548 2549 static int snd_pcm_release(struct inode *inode, struct file *file) 2550 { 2551 struct snd_pcm *pcm; 2552 struct snd_pcm_substream *substream; 2553 struct snd_pcm_file *pcm_file; 2554 2555 pcm_file = file->private_data; 2556 substream = pcm_file->substream; 2557 if (snd_BUG_ON(!substream)) 2558 return -ENXIO; 2559 pcm = substream->pcm; 2560 mutex_lock(&pcm->open_mutex); 2561 snd_pcm_release_substream(substream); 2562 kfree(pcm_file); 2563 mutex_unlock(&pcm->open_mutex); 2564 wake_up(&pcm->open_wait); 2565 module_put(pcm->card->module); 2566 snd_card_file_remove(pcm->card, file); 2567 return 0; 2568 } 2569 2570 /* check and update PCM state; return 0 or a negative error 2571 * call this inside PCM lock 2572 */ 2573 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2574 { 2575 switch (substream->runtime->status->state) { 2576 case SNDRV_PCM_STATE_DRAINING: 2577 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2578 return -EBADFD; 2579 /* Fall through */ 2580 case SNDRV_PCM_STATE_RUNNING: 2581 return snd_pcm_update_hw_ptr(substream); 2582 case SNDRV_PCM_STATE_PREPARED: 2583 case SNDRV_PCM_STATE_PAUSED: 2584 return 0; 2585 case SNDRV_PCM_STATE_SUSPENDED: 2586 return -ESTRPIPE; 2587 case SNDRV_PCM_STATE_XRUN: 2588 return -EPIPE; 2589 default: 2590 return -EBADFD; 2591 } 2592 } 2593 2594 /* increase the appl_ptr; returns the processed frames or a negative error */ 2595 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2596 snd_pcm_uframes_t frames, 2597 snd_pcm_sframes_t avail) 2598 { 2599 struct snd_pcm_runtime *runtime = substream->runtime; 2600 snd_pcm_sframes_t appl_ptr; 2601 int ret; 2602 2603 if (avail <= 0) 2604 return 0; 2605 if (frames > (snd_pcm_uframes_t)avail) 2606 frames = avail; 2607 appl_ptr = runtime->control->appl_ptr + frames; 2608 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2609 appl_ptr -= runtime->boundary; 2610 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2611 return ret < 0 ? ret : frames; 2612 } 2613 2614 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2615 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2616 snd_pcm_uframes_t frames, 2617 snd_pcm_sframes_t avail) 2618 { 2619 struct snd_pcm_runtime *runtime = substream->runtime; 2620 snd_pcm_sframes_t appl_ptr; 2621 int ret; 2622 2623 if (avail <= 0) 2624 return 0; 2625 if (frames > (snd_pcm_uframes_t)avail) 2626 frames = avail; 2627 appl_ptr = runtime->control->appl_ptr - frames; 2628 if (appl_ptr < 0) 2629 appl_ptr += runtime->boundary; 2630 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2631 /* NOTE: we return zero for errors because PulseAudio gets depressed 2632 * upon receiving an error from rewind ioctl and stops processing 2633 * any longer. Returning zero means that no rewind is done, so 2634 * it's not absolutely wrong to answer like that. 2635 */ 2636 return ret < 0 ? 0 : frames; 2637 } 2638 2639 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2640 snd_pcm_uframes_t frames) 2641 { 2642 snd_pcm_sframes_t ret; 2643 2644 if (frames == 0) 2645 return 0; 2646 2647 snd_pcm_stream_lock_irq(substream); 2648 ret = do_pcm_hwsync(substream); 2649 if (!ret) 2650 ret = rewind_appl_ptr(substream, frames, 2651 snd_pcm_hw_avail(substream)); 2652 snd_pcm_stream_unlock_irq(substream); 2653 return ret; 2654 } 2655 2656 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2657 snd_pcm_uframes_t frames) 2658 { 2659 snd_pcm_sframes_t ret; 2660 2661 if (frames == 0) 2662 return 0; 2663 2664 snd_pcm_stream_lock_irq(substream); 2665 ret = do_pcm_hwsync(substream); 2666 if (!ret) 2667 ret = forward_appl_ptr(substream, frames, 2668 snd_pcm_avail(substream)); 2669 snd_pcm_stream_unlock_irq(substream); 2670 return ret; 2671 } 2672 2673 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2674 { 2675 int err; 2676 2677 snd_pcm_stream_lock_irq(substream); 2678 err = do_pcm_hwsync(substream); 2679 snd_pcm_stream_unlock_irq(substream); 2680 return err; 2681 } 2682 2683 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2684 snd_pcm_sframes_t *delay) 2685 { 2686 int err; 2687 snd_pcm_sframes_t n = 0; 2688 2689 snd_pcm_stream_lock_irq(substream); 2690 err = do_pcm_hwsync(substream); 2691 if (!err) 2692 n = snd_pcm_calc_delay(substream); 2693 snd_pcm_stream_unlock_irq(substream); 2694 if (!err) 2695 *delay = n; 2696 return err; 2697 } 2698 2699 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2700 struct snd_pcm_sync_ptr __user *_sync_ptr) 2701 { 2702 struct snd_pcm_runtime *runtime = substream->runtime; 2703 struct snd_pcm_sync_ptr sync_ptr; 2704 volatile struct snd_pcm_mmap_status *status; 2705 volatile struct snd_pcm_mmap_control *control; 2706 int err; 2707 2708 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2709 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2710 return -EFAULT; 2711 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2712 return -EFAULT; 2713 status = runtime->status; 2714 control = runtime->control; 2715 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2716 err = snd_pcm_hwsync(substream); 2717 if (err < 0) 2718 return err; 2719 } 2720 snd_pcm_stream_lock_irq(substream); 2721 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2722 err = pcm_lib_apply_appl_ptr(substream, 2723 sync_ptr.c.control.appl_ptr); 2724 if (err < 0) { 2725 snd_pcm_stream_unlock_irq(substream); 2726 return err; 2727 } 2728 } else { 2729 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2730 } 2731 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2732 control->avail_min = sync_ptr.c.control.avail_min; 2733 else 2734 sync_ptr.c.control.avail_min = control->avail_min; 2735 sync_ptr.s.status.state = status->state; 2736 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2737 sync_ptr.s.status.tstamp = status->tstamp; 2738 sync_ptr.s.status.suspended_state = status->suspended_state; 2739 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2740 snd_pcm_stream_unlock_irq(substream); 2741 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2742 return -EFAULT; 2743 return 0; 2744 } 2745 2746 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2747 { 2748 struct snd_pcm_runtime *runtime = substream->runtime; 2749 int arg; 2750 2751 if (get_user(arg, _arg)) 2752 return -EFAULT; 2753 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2754 return -EINVAL; 2755 runtime->tstamp_type = arg; 2756 return 0; 2757 } 2758 2759 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2760 struct snd_xferi __user *_xferi) 2761 { 2762 struct snd_xferi xferi; 2763 struct snd_pcm_runtime *runtime = substream->runtime; 2764 snd_pcm_sframes_t result; 2765 2766 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2767 return -EBADFD; 2768 if (put_user(0, &_xferi->result)) 2769 return -EFAULT; 2770 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2771 return -EFAULT; 2772 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2773 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2774 else 2775 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2776 __put_user(result, &_xferi->result); 2777 return result < 0 ? result : 0; 2778 } 2779 2780 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2781 struct snd_xfern __user *_xfern) 2782 { 2783 struct snd_xfern xfern; 2784 struct snd_pcm_runtime *runtime = substream->runtime; 2785 void *bufs; 2786 snd_pcm_sframes_t result; 2787 2788 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2789 return -EBADFD; 2790 if (runtime->channels > 128) 2791 return -EINVAL; 2792 if (put_user(0, &_xfern->result)) 2793 return -EFAULT; 2794 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2795 return -EFAULT; 2796 2797 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2798 if (IS_ERR(bufs)) 2799 return PTR_ERR(bufs); 2800 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2801 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2802 else 2803 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2804 kfree(bufs); 2805 __put_user(result, &_xfern->result); 2806 return result < 0 ? result : 0; 2807 } 2808 2809 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2810 snd_pcm_uframes_t __user *_frames) 2811 { 2812 snd_pcm_uframes_t frames; 2813 snd_pcm_sframes_t result; 2814 2815 if (get_user(frames, _frames)) 2816 return -EFAULT; 2817 if (put_user(0, _frames)) 2818 return -EFAULT; 2819 result = snd_pcm_rewind(substream, frames); 2820 __put_user(result, _frames); 2821 return result < 0 ? result : 0; 2822 } 2823 2824 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2825 snd_pcm_uframes_t __user *_frames) 2826 { 2827 snd_pcm_uframes_t frames; 2828 snd_pcm_sframes_t result; 2829 2830 if (get_user(frames, _frames)) 2831 return -EFAULT; 2832 if (put_user(0, _frames)) 2833 return -EFAULT; 2834 result = snd_pcm_forward(substream, frames); 2835 __put_user(result, _frames); 2836 return result < 0 ? result : 0; 2837 } 2838 2839 static int snd_pcm_common_ioctl(struct file *file, 2840 struct snd_pcm_substream *substream, 2841 unsigned int cmd, void __user *arg) 2842 { 2843 struct snd_pcm_file *pcm_file = file->private_data; 2844 int res; 2845 2846 if (PCM_RUNTIME_CHECK(substream)) 2847 return -ENXIO; 2848 2849 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2850 if (res < 0) 2851 return res; 2852 2853 switch (cmd) { 2854 case SNDRV_PCM_IOCTL_PVERSION: 2855 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2856 case SNDRV_PCM_IOCTL_INFO: 2857 return snd_pcm_info_user(substream, arg); 2858 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2859 return 0; 2860 case SNDRV_PCM_IOCTL_TTSTAMP: 2861 return snd_pcm_tstamp(substream, arg); 2862 case SNDRV_PCM_IOCTL_USER_PVERSION: 2863 if (get_user(pcm_file->user_pversion, 2864 (unsigned int __user *)arg)) 2865 return -EFAULT; 2866 return 0; 2867 case SNDRV_PCM_IOCTL_HW_REFINE: 2868 return snd_pcm_hw_refine_user(substream, arg); 2869 case SNDRV_PCM_IOCTL_HW_PARAMS: 2870 return snd_pcm_hw_params_user(substream, arg); 2871 case SNDRV_PCM_IOCTL_HW_FREE: 2872 return snd_pcm_hw_free(substream); 2873 case SNDRV_PCM_IOCTL_SW_PARAMS: 2874 return snd_pcm_sw_params_user(substream, arg); 2875 case SNDRV_PCM_IOCTL_STATUS: 2876 return snd_pcm_status_user(substream, arg, false); 2877 case SNDRV_PCM_IOCTL_STATUS_EXT: 2878 return snd_pcm_status_user(substream, arg, true); 2879 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2880 return snd_pcm_channel_info_user(substream, arg); 2881 case SNDRV_PCM_IOCTL_PREPARE: 2882 return snd_pcm_prepare(substream, file); 2883 case SNDRV_PCM_IOCTL_RESET: 2884 return snd_pcm_reset(substream); 2885 case SNDRV_PCM_IOCTL_START: 2886 return snd_pcm_start_lock_irq(substream); 2887 case SNDRV_PCM_IOCTL_LINK: 2888 return snd_pcm_link(substream, (int)(unsigned long) arg); 2889 case SNDRV_PCM_IOCTL_UNLINK: 2890 return snd_pcm_unlink(substream); 2891 case SNDRV_PCM_IOCTL_RESUME: 2892 return snd_pcm_resume(substream); 2893 case SNDRV_PCM_IOCTL_XRUN: 2894 return snd_pcm_xrun(substream); 2895 case SNDRV_PCM_IOCTL_HWSYNC: 2896 return snd_pcm_hwsync(substream); 2897 case SNDRV_PCM_IOCTL_DELAY: 2898 { 2899 snd_pcm_sframes_t delay; 2900 snd_pcm_sframes_t __user *res = arg; 2901 int err; 2902 2903 err = snd_pcm_delay(substream, &delay); 2904 if (err) 2905 return err; 2906 if (put_user(delay, res)) 2907 return -EFAULT; 2908 return 0; 2909 } 2910 case SNDRV_PCM_IOCTL_SYNC_PTR: 2911 return snd_pcm_sync_ptr(substream, arg); 2912 #ifdef CONFIG_SND_SUPPORT_OLD_API 2913 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2914 return snd_pcm_hw_refine_old_user(substream, arg); 2915 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2916 return snd_pcm_hw_params_old_user(substream, arg); 2917 #endif 2918 case SNDRV_PCM_IOCTL_DRAIN: 2919 return snd_pcm_drain(substream, file); 2920 case SNDRV_PCM_IOCTL_DROP: 2921 return snd_pcm_drop(substream); 2922 case SNDRV_PCM_IOCTL_PAUSE: 2923 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2924 substream, 2925 (int)(unsigned long)arg); 2926 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2927 case SNDRV_PCM_IOCTL_READI_FRAMES: 2928 return snd_pcm_xferi_frames_ioctl(substream, arg); 2929 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2930 case SNDRV_PCM_IOCTL_READN_FRAMES: 2931 return snd_pcm_xfern_frames_ioctl(substream, arg); 2932 case SNDRV_PCM_IOCTL_REWIND: 2933 return snd_pcm_rewind_ioctl(substream, arg); 2934 case SNDRV_PCM_IOCTL_FORWARD: 2935 return snd_pcm_forward_ioctl(substream, arg); 2936 } 2937 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2938 return -ENOTTY; 2939 } 2940 2941 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 2942 unsigned long arg) 2943 { 2944 struct snd_pcm_file *pcm_file; 2945 2946 pcm_file = file->private_data; 2947 2948 if (((cmd >> 8) & 0xff) != 'A') 2949 return -ENOTTY; 2950 2951 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 2952 (void __user *)arg); 2953 } 2954 2955 /** 2956 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 2957 * @substream: PCM substream 2958 * @cmd: IOCTL cmd 2959 * @arg: IOCTL argument 2960 * 2961 * The function is provided primarily for OSS layer and USB gadget drivers, 2962 * and it allows only the limited set of ioctls (hw_params, sw_params, 2963 * prepare, start, drain, drop, forward). 2964 */ 2965 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2966 unsigned int cmd, void *arg) 2967 { 2968 snd_pcm_uframes_t *frames = arg; 2969 snd_pcm_sframes_t result; 2970 2971 switch (cmd) { 2972 case SNDRV_PCM_IOCTL_FORWARD: 2973 { 2974 /* provided only for OSS; capture-only and no value returned */ 2975 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 2976 return -EINVAL; 2977 result = snd_pcm_forward(substream, *frames); 2978 return result < 0 ? result : 0; 2979 } 2980 case SNDRV_PCM_IOCTL_HW_PARAMS: 2981 return snd_pcm_hw_params(substream, arg); 2982 case SNDRV_PCM_IOCTL_SW_PARAMS: 2983 return snd_pcm_sw_params(substream, arg); 2984 case SNDRV_PCM_IOCTL_PREPARE: 2985 return snd_pcm_prepare(substream, NULL); 2986 case SNDRV_PCM_IOCTL_START: 2987 return snd_pcm_start_lock_irq(substream); 2988 case SNDRV_PCM_IOCTL_DRAIN: 2989 return snd_pcm_drain(substream, NULL); 2990 case SNDRV_PCM_IOCTL_DROP: 2991 return snd_pcm_drop(substream); 2992 case SNDRV_PCM_IOCTL_DELAY: 2993 return snd_pcm_delay(substream, frames); 2994 default: 2995 return -EINVAL; 2996 } 2997 } 2998 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2999 3000 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3001 loff_t * offset) 3002 { 3003 struct snd_pcm_file *pcm_file; 3004 struct snd_pcm_substream *substream; 3005 struct snd_pcm_runtime *runtime; 3006 snd_pcm_sframes_t result; 3007 3008 pcm_file = file->private_data; 3009 substream = pcm_file->substream; 3010 if (PCM_RUNTIME_CHECK(substream)) 3011 return -ENXIO; 3012 runtime = substream->runtime; 3013 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3014 return -EBADFD; 3015 if (!frame_aligned(runtime, count)) 3016 return -EINVAL; 3017 count = bytes_to_frames(runtime, count); 3018 result = snd_pcm_lib_read(substream, buf, count); 3019 if (result > 0) 3020 result = frames_to_bytes(runtime, result); 3021 return result; 3022 } 3023 3024 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3025 size_t count, loff_t * offset) 3026 { 3027 struct snd_pcm_file *pcm_file; 3028 struct snd_pcm_substream *substream; 3029 struct snd_pcm_runtime *runtime; 3030 snd_pcm_sframes_t result; 3031 3032 pcm_file = file->private_data; 3033 substream = pcm_file->substream; 3034 if (PCM_RUNTIME_CHECK(substream)) 3035 return -ENXIO; 3036 runtime = substream->runtime; 3037 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3038 return -EBADFD; 3039 if (!frame_aligned(runtime, count)) 3040 return -EINVAL; 3041 count = bytes_to_frames(runtime, count); 3042 result = snd_pcm_lib_write(substream, buf, count); 3043 if (result > 0) 3044 result = frames_to_bytes(runtime, result); 3045 return result; 3046 } 3047 3048 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3049 { 3050 struct snd_pcm_file *pcm_file; 3051 struct snd_pcm_substream *substream; 3052 struct snd_pcm_runtime *runtime; 3053 snd_pcm_sframes_t result; 3054 unsigned long i; 3055 void __user **bufs; 3056 snd_pcm_uframes_t frames; 3057 3058 pcm_file = iocb->ki_filp->private_data; 3059 substream = pcm_file->substream; 3060 if (PCM_RUNTIME_CHECK(substream)) 3061 return -ENXIO; 3062 runtime = substream->runtime; 3063 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3064 return -EBADFD; 3065 if (!iter_is_iovec(to)) 3066 return -EINVAL; 3067 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3068 return -EINVAL; 3069 if (!frame_aligned(runtime, to->iov->iov_len)) 3070 return -EINVAL; 3071 frames = bytes_to_samples(runtime, to->iov->iov_len); 3072 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3073 if (bufs == NULL) 3074 return -ENOMEM; 3075 for (i = 0; i < to->nr_segs; ++i) 3076 bufs[i] = to->iov[i].iov_base; 3077 result = snd_pcm_lib_readv(substream, bufs, frames); 3078 if (result > 0) 3079 result = frames_to_bytes(runtime, result); 3080 kfree(bufs); 3081 return result; 3082 } 3083 3084 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3085 { 3086 struct snd_pcm_file *pcm_file; 3087 struct snd_pcm_substream *substream; 3088 struct snd_pcm_runtime *runtime; 3089 snd_pcm_sframes_t result; 3090 unsigned long i; 3091 void __user **bufs; 3092 snd_pcm_uframes_t frames; 3093 3094 pcm_file = iocb->ki_filp->private_data; 3095 substream = pcm_file->substream; 3096 if (PCM_RUNTIME_CHECK(substream)) 3097 return -ENXIO; 3098 runtime = substream->runtime; 3099 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3100 return -EBADFD; 3101 if (!iter_is_iovec(from)) 3102 return -EINVAL; 3103 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3104 !frame_aligned(runtime, from->iov->iov_len)) 3105 return -EINVAL; 3106 frames = bytes_to_samples(runtime, from->iov->iov_len); 3107 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3108 if (bufs == NULL) 3109 return -ENOMEM; 3110 for (i = 0; i < from->nr_segs; ++i) 3111 bufs[i] = from->iov[i].iov_base; 3112 result = snd_pcm_lib_writev(substream, bufs, frames); 3113 if (result > 0) 3114 result = frames_to_bytes(runtime, result); 3115 kfree(bufs); 3116 return result; 3117 } 3118 3119 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3120 { 3121 struct snd_pcm_file *pcm_file; 3122 struct snd_pcm_substream *substream; 3123 struct snd_pcm_runtime *runtime; 3124 __poll_t mask, ok; 3125 snd_pcm_uframes_t avail; 3126 3127 pcm_file = file->private_data; 3128 3129 substream = pcm_file->substream; 3130 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3131 ok = EPOLLOUT | EPOLLWRNORM; 3132 else 3133 ok = EPOLLIN | EPOLLRDNORM; 3134 if (PCM_RUNTIME_CHECK(substream)) 3135 return ok | EPOLLERR; 3136 3137 runtime = substream->runtime; 3138 poll_wait(file, &runtime->sleep, wait); 3139 3140 mask = 0; 3141 snd_pcm_stream_lock_irq(substream); 3142 avail = snd_pcm_avail(substream); 3143 switch (runtime->status->state) { 3144 case SNDRV_PCM_STATE_RUNNING: 3145 case SNDRV_PCM_STATE_PREPARED: 3146 case SNDRV_PCM_STATE_PAUSED: 3147 if (avail >= runtime->control->avail_min) 3148 mask = ok; 3149 break; 3150 case SNDRV_PCM_STATE_DRAINING: 3151 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3152 mask = ok; 3153 if (!avail) 3154 mask |= EPOLLERR; 3155 } 3156 break; 3157 default: 3158 mask = ok | EPOLLERR; 3159 break; 3160 } 3161 snd_pcm_stream_unlock_irq(substream); 3162 return mask; 3163 } 3164 3165 /* 3166 * mmap support 3167 */ 3168 3169 /* 3170 * Only on coherent architectures, we can mmap the status and the control records 3171 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3172 */ 3173 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3174 /* 3175 * mmap status record 3176 */ 3177 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3178 { 3179 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3180 struct snd_pcm_runtime *runtime; 3181 3182 if (substream == NULL) 3183 return VM_FAULT_SIGBUS; 3184 runtime = substream->runtime; 3185 vmf->page = virt_to_page(runtime->status); 3186 get_page(vmf->page); 3187 return 0; 3188 } 3189 3190 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3191 { 3192 .fault = snd_pcm_mmap_status_fault, 3193 }; 3194 3195 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3196 struct vm_area_struct *area) 3197 { 3198 long size; 3199 if (!(area->vm_flags & VM_READ)) 3200 return -EINVAL; 3201 size = area->vm_end - area->vm_start; 3202 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3203 return -EINVAL; 3204 area->vm_ops = &snd_pcm_vm_ops_status; 3205 area->vm_private_data = substream; 3206 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3207 return 0; 3208 } 3209 3210 /* 3211 * mmap control record 3212 */ 3213 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3214 { 3215 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3216 struct snd_pcm_runtime *runtime; 3217 3218 if (substream == NULL) 3219 return VM_FAULT_SIGBUS; 3220 runtime = substream->runtime; 3221 vmf->page = virt_to_page(runtime->control); 3222 get_page(vmf->page); 3223 return 0; 3224 } 3225 3226 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3227 { 3228 .fault = snd_pcm_mmap_control_fault, 3229 }; 3230 3231 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3232 struct vm_area_struct *area) 3233 { 3234 long size; 3235 if (!(area->vm_flags & VM_READ)) 3236 return -EINVAL; 3237 size = area->vm_end - area->vm_start; 3238 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3239 return -EINVAL; 3240 area->vm_ops = &snd_pcm_vm_ops_control; 3241 area->vm_private_data = substream; 3242 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3243 return 0; 3244 } 3245 3246 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3247 { 3248 if (pcm_file->no_compat_mmap) 3249 return false; 3250 /* See pcm_control_mmap_allowed() below. 3251 * Since older alsa-lib requires both status and control mmaps to be 3252 * coupled, we have to disable the status mmap for old alsa-lib, too. 3253 */ 3254 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3255 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3256 return false; 3257 return true; 3258 } 3259 3260 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3261 { 3262 if (pcm_file->no_compat_mmap) 3263 return false; 3264 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3265 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3266 * thus it effectively assures the manual update of appl_ptr. 3267 */ 3268 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3269 return false; 3270 return true; 3271 } 3272 3273 #else /* ! coherent mmap */ 3274 /* 3275 * don't support mmap for status and control records. 3276 */ 3277 #define pcm_status_mmap_allowed(pcm_file) false 3278 #define pcm_control_mmap_allowed(pcm_file) false 3279 3280 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3281 struct vm_area_struct *area) 3282 { 3283 return -ENXIO; 3284 } 3285 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3286 struct vm_area_struct *area) 3287 { 3288 return -ENXIO; 3289 } 3290 #endif /* coherent mmap */ 3291 3292 static inline struct page * 3293 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3294 { 3295 void *vaddr = substream->runtime->dma_area + ofs; 3296 return virt_to_page(vaddr); 3297 } 3298 3299 /* 3300 * fault callback for mmapping a RAM page 3301 */ 3302 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3303 { 3304 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3305 struct snd_pcm_runtime *runtime; 3306 unsigned long offset; 3307 struct page * page; 3308 size_t dma_bytes; 3309 3310 if (substream == NULL) 3311 return VM_FAULT_SIGBUS; 3312 runtime = substream->runtime; 3313 offset = vmf->pgoff << PAGE_SHIFT; 3314 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3315 if (offset > dma_bytes - PAGE_SIZE) 3316 return VM_FAULT_SIGBUS; 3317 if (substream->ops->page) 3318 page = substream->ops->page(substream, offset); 3319 else 3320 page = snd_pcm_default_page_ops(substream, offset); 3321 if (!page) 3322 return VM_FAULT_SIGBUS; 3323 get_page(page); 3324 vmf->page = page; 3325 return 0; 3326 } 3327 3328 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3329 .open = snd_pcm_mmap_data_open, 3330 .close = snd_pcm_mmap_data_close, 3331 }; 3332 3333 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3334 .open = snd_pcm_mmap_data_open, 3335 .close = snd_pcm_mmap_data_close, 3336 .fault = snd_pcm_mmap_data_fault, 3337 }; 3338 3339 /* 3340 * mmap the DMA buffer on RAM 3341 */ 3342 3343 /** 3344 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3345 * @substream: PCM substream 3346 * @area: VMA 3347 * 3348 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3349 * this function is invoked implicitly. 3350 */ 3351 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3352 struct vm_area_struct *area) 3353 { 3354 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3355 #ifdef CONFIG_GENERIC_ALLOCATOR 3356 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3357 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3358 return remap_pfn_range(area, area->vm_start, 3359 substream->dma_buffer.addr >> PAGE_SHIFT, 3360 area->vm_end - area->vm_start, area->vm_page_prot); 3361 } 3362 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3363 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3364 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3365 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3366 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3367 area, 3368 substream->runtime->dma_area, 3369 substream->runtime->dma_addr, 3370 substream->runtime->dma_bytes); 3371 #endif /* CONFIG_X86 */ 3372 /* mmap with fault handler */ 3373 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3374 return 0; 3375 } 3376 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3377 3378 /* 3379 * mmap the DMA buffer on I/O memory area 3380 */ 3381 #if SNDRV_PCM_INFO_MMAP_IOMEM 3382 /** 3383 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3384 * @substream: PCM substream 3385 * @area: VMA 3386 * 3387 * When your hardware uses the iomapped pages as the hardware buffer and 3388 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3389 * is supposed to work only on limited architectures. 3390 */ 3391 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3392 struct vm_area_struct *area) 3393 { 3394 struct snd_pcm_runtime *runtime = substream->runtime; 3395 3396 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3397 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3398 } 3399 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3400 #endif /* SNDRV_PCM_INFO_MMAP */ 3401 3402 /* 3403 * mmap DMA buffer 3404 */ 3405 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3406 struct vm_area_struct *area) 3407 { 3408 struct snd_pcm_runtime *runtime; 3409 long size; 3410 unsigned long offset; 3411 size_t dma_bytes; 3412 int err; 3413 3414 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3415 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3416 return -EINVAL; 3417 } else { 3418 if (!(area->vm_flags & VM_READ)) 3419 return -EINVAL; 3420 } 3421 runtime = substream->runtime; 3422 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3423 return -EBADFD; 3424 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3425 return -ENXIO; 3426 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3427 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3428 return -EINVAL; 3429 size = area->vm_end - area->vm_start; 3430 offset = area->vm_pgoff << PAGE_SHIFT; 3431 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3432 if ((size_t)size > dma_bytes) 3433 return -EINVAL; 3434 if (offset > dma_bytes - size) 3435 return -EINVAL; 3436 3437 area->vm_ops = &snd_pcm_vm_ops_data; 3438 area->vm_private_data = substream; 3439 if (substream->ops->mmap) 3440 err = substream->ops->mmap(substream, area); 3441 else 3442 err = snd_pcm_lib_default_mmap(substream, area); 3443 if (!err) 3444 atomic_inc(&substream->mmap_count); 3445 return err; 3446 } 3447 EXPORT_SYMBOL(snd_pcm_mmap_data); 3448 3449 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3450 { 3451 struct snd_pcm_file * pcm_file; 3452 struct snd_pcm_substream *substream; 3453 unsigned long offset; 3454 3455 pcm_file = file->private_data; 3456 substream = pcm_file->substream; 3457 if (PCM_RUNTIME_CHECK(substream)) 3458 return -ENXIO; 3459 3460 offset = area->vm_pgoff << PAGE_SHIFT; 3461 switch (offset) { 3462 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3463 if (!pcm_status_mmap_allowed(pcm_file)) 3464 return -ENXIO; 3465 return snd_pcm_mmap_status(substream, file, area); 3466 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3467 if (!pcm_control_mmap_allowed(pcm_file)) 3468 return -ENXIO; 3469 return snd_pcm_mmap_control(substream, file, area); 3470 default: 3471 return snd_pcm_mmap_data(substream, file, area); 3472 } 3473 return 0; 3474 } 3475 3476 static int snd_pcm_fasync(int fd, struct file * file, int on) 3477 { 3478 struct snd_pcm_file * pcm_file; 3479 struct snd_pcm_substream *substream; 3480 struct snd_pcm_runtime *runtime; 3481 3482 pcm_file = file->private_data; 3483 substream = pcm_file->substream; 3484 if (PCM_RUNTIME_CHECK(substream)) 3485 return -ENXIO; 3486 runtime = substream->runtime; 3487 return fasync_helper(fd, file, on, &runtime->fasync); 3488 } 3489 3490 /* 3491 * ioctl32 compat 3492 */ 3493 #ifdef CONFIG_COMPAT 3494 #include "pcm_compat.c" 3495 #else 3496 #define snd_pcm_ioctl_compat NULL 3497 #endif 3498 3499 /* 3500 * To be removed helpers to keep binary compatibility 3501 */ 3502 3503 #ifdef CONFIG_SND_SUPPORT_OLD_API 3504 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3505 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3506 3507 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3508 struct snd_pcm_hw_params_old *oparams) 3509 { 3510 unsigned int i; 3511 3512 memset(params, 0, sizeof(*params)); 3513 params->flags = oparams->flags; 3514 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3515 params->masks[i].bits[0] = oparams->masks[i]; 3516 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3517 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3518 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3519 params->info = oparams->info; 3520 params->msbits = oparams->msbits; 3521 params->rate_num = oparams->rate_num; 3522 params->rate_den = oparams->rate_den; 3523 params->fifo_size = oparams->fifo_size; 3524 } 3525 3526 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3527 struct snd_pcm_hw_params *params) 3528 { 3529 unsigned int i; 3530 3531 memset(oparams, 0, sizeof(*oparams)); 3532 oparams->flags = params->flags; 3533 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3534 oparams->masks[i] = params->masks[i].bits[0]; 3535 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3536 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3537 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3538 oparams->info = params->info; 3539 oparams->msbits = params->msbits; 3540 oparams->rate_num = params->rate_num; 3541 oparams->rate_den = params->rate_den; 3542 oparams->fifo_size = params->fifo_size; 3543 } 3544 3545 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3546 struct snd_pcm_hw_params_old __user * _oparams) 3547 { 3548 struct snd_pcm_hw_params *params; 3549 struct snd_pcm_hw_params_old *oparams = NULL; 3550 int err; 3551 3552 params = kmalloc(sizeof(*params), GFP_KERNEL); 3553 if (!params) 3554 return -ENOMEM; 3555 3556 oparams = memdup_user(_oparams, sizeof(*oparams)); 3557 if (IS_ERR(oparams)) { 3558 err = PTR_ERR(oparams); 3559 goto out; 3560 } 3561 snd_pcm_hw_convert_from_old_params(params, oparams); 3562 err = snd_pcm_hw_refine(substream, params); 3563 if (err < 0) 3564 goto out_old; 3565 3566 err = fixup_unreferenced_params(substream, params); 3567 if (err < 0) 3568 goto out_old; 3569 3570 snd_pcm_hw_convert_to_old_params(oparams, params); 3571 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3572 err = -EFAULT; 3573 out_old: 3574 kfree(oparams); 3575 out: 3576 kfree(params); 3577 return err; 3578 } 3579 3580 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3581 struct snd_pcm_hw_params_old __user * _oparams) 3582 { 3583 struct snd_pcm_hw_params *params; 3584 struct snd_pcm_hw_params_old *oparams = NULL; 3585 int err; 3586 3587 params = kmalloc(sizeof(*params), GFP_KERNEL); 3588 if (!params) 3589 return -ENOMEM; 3590 3591 oparams = memdup_user(_oparams, sizeof(*oparams)); 3592 if (IS_ERR(oparams)) { 3593 err = PTR_ERR(oparams); 3594 goto out; 3595 } 3596 3597 snd_pcm_hw_convert_from_old_params(params, oparams); 3598 err = snd_pcm_hw_params(substream, params); 3599 if (err < 0) 3600 goto out_old; 3601 3602 snd_pcm_hw_convert_to_old_params(oparams, params); 3603 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3604 err = -EFAULT; 3605 out_old: 3606 kfree(oparams); 3607 out: 3608 kfree(params); 3609 return err; 3610 } 3611 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3612 3613 #ifndef CONFIG_MMU 3614 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3615 unsigned long addr, 3616 unsigned long len, 3617 unsigned long pgoff, 3618 unsigned long flags) 3619 { 3620 struct snd_pcm_file *pcm_file = file->private_data; 3621 struct snd_pcm_substream *substream = pcm_file->substream; 3622 struct snd_pcm_runtime *runtime = substream->runtime; 3623 unsigned long offset = pgoff << PAGE_SHIFT; 3624 3625 switch (offset) { 3626 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3627 return (unsigned long)runtime->status; 3628 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3629 return (unsigned long)runtime->control; 3630 default: 3631 return (unsigned long)runtime->dma_area + offset; 3632 } 3633 } 3634 #else 3635 # define snd_pcm_get_unmapped_area NULL 3636 #endif 3637 3638 /* 3639 * Register section 3640 */ 3641 3642 const struct file_operations snd_pcm_f_ops[2] = { 3643 { 3644 .owner = THIS_MODULE, 3645 .write = snd_pcm_write, 3646 .write_iter = snd_pcm_writev, 3647 .open = snd_pcm_playback_open, 3648 .release = snd_pcm_release, 3649 .llseek = no_llseek, 3650 .poll = snd_pcm_poll, 3651 .unlocked_ioctl = snd_pcm_ioctl, 3652 .compat_ioctl = snd_pcm_ioctl_compat, 3653 .mmap = snd_pcm_mmap, 3654 .fasync = snd_pcm_fasync, 3655 .get_unmapped_area = snd_pcm_get_unmapped_area, 3656 }, 3657 { 3658 .owner = THIS_MODULE, 3659 .read = snd_pcm_read, 3660 .read_iter = snd_pcm_readv, 3661 .open = snd_pcm_capture_open, 3662 .release = snd_pcm_release, 3663 .llseek = no_llseek, 3664 .poll = snd_pcm_poll, 3665 .unlocked_ioctl = snd_pcm_ioctl, 3666 .compat_ioctl = snd_pcm_ioctl_compat, 3667 .mmap = snd_pcm_mmap, 3668 .fasync = snd_pcm_fasync, 3669 .get_unmapped_area = snd_pcm_get_unmapped_area, 3670 } 3671 }; 3672