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 @substream is %NULL), or a negative error 1470 * code. 1471 */ 1472 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1473 { 1474 int err; 1475 unsigned long flags; 1476 1477 if (! substream) 1478 return 0; 1479 1480 snd_pcm_stream_lock_irqsave(substream, flags); 1481 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1482 snd_pcm_stream_unlock_irqrestore(substream, flags); 1483 return err; 1484 } 1485 EXPORT_SYMBOL(snd_pcm_suspend); 1486 1487 /** 1488 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1489 * @pcm: the PCM instance 1490 * 1491 * After this call, all streams are changed to SUSPENDED state. 1492 * 1493 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1494 */ 1495 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1496 { 1497 struct snd_pcm_substream *substream; 1498 int stream, err = 0; 1499 1500 if (! pcm) 1501 return 0; 1502 1503 for (stream = 0; stream < 2; stream++) { 1504 for (substream = pcm->streams[stream].substream; 1505 substream; substream = substream->next) { 1506 /* FIXME: the open/close code should lock this as well */ 1507 if (substream->runtime == NULL) 1508 continue; 1509 err = snd_pcm_suspend(substream); 1510 if (err < 0 && err != -EBUSY) 1511 return err; 1512 } 1513 } 1514 return 0; 1515 } 1516 EXPORT_SYMBOL(snd_pcm_suspend_all); 1517 1518 /* resume */ 1519 1520 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1521 { 1522 struct snd_pcm_runtime *runtime = substream->runtime; 1523 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1524 return -ENOSYS; 1525 runtime->trigger_master = substream; 1526 return 0; 1527 } 1528 1529 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1530 { 1531 struct snd_pcm_runtime *runtime = substream->runtime; 1532 if (runtime->trigger_master != substream) 1533 return 0; 1534 /* DMA not running previously? */ 1535 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1536 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1537 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1538 return 0; 1539 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1540 } 1541 1542 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1543 { 1544 if (substream->runtime->trigger_master == substream && 1545 snd_pcm_running(substream)) 1546 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1547 } 1548 1549 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1550 { 1551 struct snd_pcm_runtime *runtime = substream->runtime; 1552 snd_pcm_trigger_tstamp(substream); 1553 runtime->status->state = runtime->status->suspended_state; 1554 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1555 } 1556 1557 static const struct action_ops snd_pcm_action_resume = { 1558 .pre_action = snd_pcm_pre_resume, 1559 .do_action = snd_pcm_do_resume, 1560 .undo_action = snd_pcm_undo_resume, 1561 .post_action = snd_pcm_post_resume 1562 }; 1563 1564 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1565 { 1566 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1567 } 1568 1569 #else 1570 1571 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1572 { 1573 return -ENOSYS; 1574 } 1575 1576 #endif /* CONFIG_PM */ 1577 1578 /* 1579 * xrun ioctl 1580 * 1581 * Change the RUNNING stream(s) to XRUN state. 1582 */ 1583 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1584 { 1585 struct snd_pcm_runtime *runtime = substream->runtime; 1586 int result; 1587 1588 snd_pcm_stream_lock_irq(substream); 1589 switch (runtime->status->state) { 1590 case SNDRV_PCM_STATE_XRUN: 1591 result = 0; /* already there */ 1592 break; 1593 case SNDRV_PCM_STATE_RUNNING: 1594 __snd_pcm_xrun(substream); 1595 result = 0; 1596 break; 1597 default: 1598 result = -EBADFD; 1599 } 1600 snd_pcm_stream_unlock_irq(substream); 1601 return result; 1602 } 1603 1604 /* 1605 * reset ioctl 1606 */ 1607 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1608 { 1609 struct snd_pcm_runtime *runtime = substream->runtime; 1610 switch (runtime->status->state) { 1611 case SNDRV_PCM_STATE_RUNNING: 1612 case SNDRV_PCM_STATE_PREPARED: 1613 case SNDRV_PCM_STATE_PAUSED: 1614 case SNDRV_PCM_STATE_SUSPENDED: 1615 return 0; 1616 default: 1617 return -EBADFD; 1618 } 1619 } 1620 1621 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1622 { 1623 struct snd_pcm_runtime *runtime = substream->runtime; 1624 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1625 if (err < 0) 1626 return err; 1627 runtime->hw_ptr_base = 0; 1628 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1629 runtime->status->hw_ptr % runtime->period_size; 1630 runtime->silence_start = runtime->status->hw_ptr; 1631 runtime->silence_filled = 0; 1632 return 0; 1633 } 1634 1635 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1636 { 1637 struct snd_pcm_runtime *runtime = substream->runtime; 1638 runtime->control->appl_ptr = runtime->status->hw_ptr; 1639 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1640 runtime->silence_size > 0) 1641 snd_pcm_playback_silence(substream, ULONG_MAX); 1642 } 1643 1644 static const struct action_ops snd_pcm_action_reset = { 1645 .pre_action = snd_pcm_pre_reset, 1646 .do_action = snd_pcm_do_reset, 1647 .post_action = snd_pcm_post_reset 1648 }; 1649 1650 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1651 { 1652 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1653 } 1654 1655 /* 1656 * prepare ioctl 1657 */ 1658 /* we use the second argument for updating f_flags */ 1659 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1660 int f_flags) 1661 { 1662 struct snd_pcm_runtime *runtime = substream->runtime; 1663 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1664 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1665 return -EBADFD; 1666 if (snd_pcm_running(substream)) 1667 return -EBUSY; 1668 substream->f_flags = f_flags; 1669 return 0; 1670 } 1671 1672 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1673 { 1674 int err; 1675 err = substream->ops->prepare(substream); 1676 if (err < 0) 1677 return err; 1678 return snd_pcm_do_reset(substream, 0); 1679 } 1680 1681 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1682 { 1683 struct snd_pcm_runtime *runtime = substream->runtime; 1684 runtime->control->appl_ptr = runtime->status->hw_ptr; 1685 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1686 } 1687 1688 static const struct action_ops snd_pcm_action_prepare = { 1689 .pre_action = snd_pcm_pre_prepare, 1690 .do_action = snd_pcm_do_prepare, 1691 .post_action = snd_pcm_post_prepare 1692 }; 1693 1694 /** 1695 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1696 * @substream: the PCM substream instance 1697 * @file: file to refer f_flags 1698 * 1699 * Return: Zero if successful, or a negative error code. 1700 */ 1701 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1702 struct file *file) 1703 { 1704 int f_flags; 1705 1706 if (file) 1707 f_flags = file->f_flags; 1708 else 1709 f_flags = substream->f_flags; 1710 1711 snd_pcm_stream_lock_irq(substream); 1712 switch (substream->runtime->status->state) { 1713 case SNDRV_PCM_STATE_PAUSED: 1714 snd_pcm_pause(substream, 0); 1715 /* fallthru */ 1716 case SNDRV_PCM_STATE_SUSPENDED: 1717 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1718 break; 1719 } 1720 snd_pcm_stream_unlock_irq(substream); 1721 1722 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1723 substream, f_flags); 1724 } 1725 1726 /* 1727 * drain ioctl 1728 */ 1729 1730 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1731 { 1732 struct snd_pcm_runtime *runtime = substream->runtime; 1733 switch (runtime->status->state) { 1734 case SNDRV_PCM_STATE_OPEN: 1735 case SNDRV_PCM_STATE_DISCONNECTED: 1736 case SNDRV_PCM_STATE_SUSPENDED: 1737 return -EBADFD; 1738 } 1739 runtime->trigger_master = substream; 1740 return 0; 1741 } 1742 1743 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1744 { 1745 struct snd_pcm_runtime *runtime = substream->runtime; 1746 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1747 switch (runtime->status->state) { 1748 case SNDRV_PCM_STATE_PREPARED: 1749 /* start playback stream if possible */ 1750 if (! snd_pcm_playback_empty(substream)) { 1751 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1752 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1753 } else { 1754 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1755 } 1756 break; 1757 case SNDRV_PCM_STATE_RUNNING: 1758 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1759 break; 1760 case SNDRV_PCM_STATE_XRUN: 1761 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1762 break; 1763 default: 1764 break; 1765 } 1766 } else { 1767 /* stop running stream */ 1768 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1769 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1770 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1771 snd_pcm_do_stop(substream, new_state); 1772 snd_pcm_post_stop(substream, new_state); 1773 } 1774 } 1775 1776 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1777 runtime->trigger_master == substream && 1778 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1779 return substream->ops->trigger(substream, 1780 SNDRV_PCM_TRIGGER_DRAIN); 1781 1782 return 0; 1783 } 1784 1785 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1786 { 1787 } 1788 1789 static const struct action_ops snd_pcm_action_drain_init = { 1790 .pre_action = snd_pcm_pre_drain_init, 1791 .do_action = snd_pcm_do_drain_init, 1792 .post_action = snd_pcm_post_drain_init 1793 }; 1794 1795 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1796 1797 /* 1798 * Drain the stream(s). 1799 * When the substream is linked, sync until the draining of all playback streams 1800 * is finished. 1801 * After this call, all streams are supposed to be either SETUP or DRAINING 1802 * (capture only) state. 1803 */ 1804 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1805 struct file *file) 1806 { 1807 struct snd_card *card; 1808 struct snd_pcm_runtime *runtime; 1809 struct snd_pcm_substream *s; 1810 wait_queue_entry_t wait; 1811 int result = 0; 1812 int nonblock = 0; 1813 1814 card = substream->pcm->card; 1815 runtime = substream->runtime; 1816 1817 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1818 return -EBADFD; 1819 1820 if (file) { 1821 if (file->f_flags & O_NONBLOCK) 1822 nonblock = 1; 1823 } else if (substream->f_flags & O_NONBLOCK) 1824 nonblock = 1; 1825 1826 down_read(&snd_pcm_link_rwsem); 1827 snd_pcm_stream_lock_irq(substream); 1828 /* resume pause */ 1829 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1830 snd_pcm_pause(substream, 0); 1831 1832 /* pre-start/stop - all running streams are changed to DRAINING state */ 1833 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1834 if (result < 0) 1835 goto unlock; 1836 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1837 if (nonblock) { 1838 result = -EAGAIN; 1839 goto unlock; 1840 } 1841 1842 for (;;) { 1843 long tout; 1844 struct snd_pcm_runtime *to_check; 1845 if (signal_pending(current)) { 1846 result = -ERESTARTSYS; 1847 break; 1848 } 1849 /* find a substream to drain */ 1850 to_check = NULL; 1851 snd_pcm_group_for_each_entry(s, substream) { 1852 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1853 continue; 1854 runtime = s->runtime; 1855 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1856 to_check = runtime; 1857 break; 1858 } 1859 } 1860 if (!to_check) 1861 break; /* all drained */ 1862 init_waitqueue_entry(&wait, current); 1863 add_wait_queue(&to_check->sleep, &wait); 1864 snd_pcm_stream_unlock_irq(substream); 1865 up_read(&snd_pcm_link_rwsem); 1866 if (runtime->no_period_wakeup) 1867 tout = MAX_SCHEDULE_TIMEOUT; 1868 else { 1869 tout = 10; 1870 if (runtime->rate) { 1871 long t = runtime->period_size * 2 / runtime->rate; 1872 tout = max(t, tout); 1873 } 1874 tout = msecs_to_jiffies(tout * 1000); 1875 } 1876 tout = schedule_timeout_interruptible(tout); 1877 down_read(&snd_pcm_link_rwsem); 1878 snd_pcm_stream_lock_irq(substream); 1879 remove_wait_queue(&to_check->sleep, &wait); 1880 if (card->shutdown) { 1881 result = -ENODEV; 1882 break; 1883 } 1884 if (tout == 0) { 1885 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1886 result = -ESTRPIPE; 1887 else { 1888 dev_dbg(substream->pcm->card->dev, 1889 "playback drain error (DMA or IRQ trouble?)\n"); 1890 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1891 result = -EIO; 1892 } 1893 break; 1894 } 1895 } 1896 1897 unlock: 1898 snd_pcm_stream_unlock_irq(substream); 1899 up_read(&snd_pcm_link_rwsem); 1900 1901 return result; 1902 } 1903 1904 /* 1905 * drop ioctl 1906 * 1907 * Immediately put all linked substreams into SETUP state. 1908 */ 1909 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1910 { 1911 struct snd_pcm_runtime *runtime; 1912 int result = 0; 1913 1914 if (PCM_RUNTIME_CHECK(substream)) 1915 return -ENXIO; 1916 runtime = substream->runtime; 1917 1918 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1919 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1920 return -EBADFD; 1921 1922 snd_pcm_stream_lock_irq(substream); 1923 /* resume pause */ 1924 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1925 snd_pcm_pause(substream, 0); 1926 1927 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1928 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1929 snd_pcm_stream_unlock_irq(substream); 1930 1931 return result; 1932 } 1933 1934 1935 static bool is_pcm_file(struct file *file) 1936 { 1937 struct inode *inode = file_inode(file); 1938 struct snd_pcm *pcm; 1939 unsigned int minor; 1940 1941 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1942 return false; 1943 minor = iminor(inode); 1944 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 1945 if (!pcm) 1946 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1947 if (!pcm) 1948 return false; 1949 snd_card_unref(pcm->card); 1950 return true; 1951 } 1952 1953 /* 1954 * PCM link handling 1955 */ 1956 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1957 { 1958 int res = 0; 1959 struct snd_pcm_file *pcm_file; 1960 struct snd_pcm_substream *substream1; 1961 struct snd_pcm_group *group; 1962 struct fd f = fdget(fd); 1963 1964 if (!f.file) 1965 return -EBADFD; 1966 if (!is_pcm_file(f.file)) { 1967 res = -EBADFD; 1968 goto _badf; 1969 } 1970 pcm_file = f.file->private_data; 1971 substream1 = pcm_file->substream; 1972 group = kmalloc(sizeof(*group), GFP_KERNEL); 1973 if (!group) { 1974 res = -ENOMEM; 1975 goto _nolock; 1976 } 1977 down_write_nonfifo(&snd_pcm_link_rwsem); 1978 write_lock_irq(&snd_pcm_link_rwlock); 1979 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1980 substream->runtime->status->state != substream1->runtime->status->state || 1981 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1982 res = -EBADFD; 1983 goto _end; 1984 } 1985 if (snd_pcm_stream_linked(substream1)) { 1986 res = -EALREADY; 1987 goto _end; 1988 } 1989 if (!snd_pcm_stream_linked(substream)) { 1990 substream->group = group; 1991 group = NULL; 1992 spin_lock_init(&substream->group->lock); 1993 mutex_init(&substream->group->mutex); 1994 INIT_LIST_HEAD(&substream->group->substreams); 1995 list_add_tail(&substream->link_list, &substream->group->substreams); 1996 substream->group->count = 1; 1997 } 1998 list_add_tail(&substream1->link_list, &substream->group->substreams); 1999 substream->group->count++; 2000 substream1->group = substream->group; 2001 _end: 2002 write_unlock_irq(&snd_pcm_link_rwlock); 2003 up_write(&snd_pcm_link_rwsem); 2004 _nolock: 2005 kfree(group); 2006 _badf: 2007 fdput(f); 2008 return res; 2009 } 2010 2011 static void relink_to_local(struct snd_pcm_substream *substream) 2012 { 2013 substream->group = &substream->self_group; 2014 INIT_LIST_HEAD(&substream->self_group.substreams); 2015 list_add_tail(&substream->link_list, &substream->self_group.substreams); 2016 } 2017 2018 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2019 { 2020 struct snd_pcm_substream *s; 2021 int res = 0; 2022 2023 down_write_nonfifo(&snd_pcm_link_rwsem); 2024 write_lock_irq(&snd_pcm_link_rwlock); 2025 if (!snd_pcm_stream_linked(substream)) { 2026 res = -EALREADY; 2027 goto _end; 2028 } 2029 list_del(&substream->link_list); 2030 substream->group->count--; 2031 if (substream->group->count == 1) { /* detach the last stream, too */ 2032 snd_pcm_group_for_each_entry(s, substream) { 2033 relink_to_local(s); 2034 break; 2035 } 2036 kfree(substream->group); 2037 } 2038 relink_to_local(substream); 2039 _end: 2040 write_unlock_irq(&snd_pcm_link_rwlock); 2041 up_write(&snd_pcm_link_rwsem); 2042 return res; 2043 } 2044 2045 /* 2046 * hw configurator 2047 */ 2048 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2049 struct snd_pcm_hw_rule *rule) 2050 { 2051 struct snd_interval t; 2052 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2053 hw_param_interval_c(params, rule->deps[1]), &t); 2054 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2055 } 2056 2057 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2058 struct snd_pcm_hw_rule *rule) 2059 { 2060 struct snd_interval t; 2061 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2062 hw_param_interval_c(params, rule->deps[1]), &t); 2063 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2064 } 2065 2066 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2067 struct snd_pcm_hw_rule *rule) 2068 { 2069 struct snd_interval t; 2070 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2071 hw_param_interval_c(params, rule->deps[1]), 2072 (unsigned long) rule->private, &t); 2073 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2074 } 2075 2076 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2077 struct snd_pcm_hw_rule *rule) 2078 { 2079 struct snd_interval t; 2080 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2081 (unsigned long) rule->private, 2082 hw_param_interval_c(params, rule->deps[1]), &t); 2083 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2084 } 2085 2086 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2087 struct snd_pcm_hw_rule *rule) 2088 { 2089 unsigned int k; 2090 const struct snd_interval *i = 2091 hw_param_interval_c(params, rule->deps[0]); 2092 struct snd_mask m; 2093 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2094 snd_mask_any(&m); 2095 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2096 int bits; 2097 if (! snd_mask_test(mask, k)) 2098 continue; 2099 bits = snd_pcm_format_physical_width(k); 2100 if (bits <= 0) 2101 continue; /* ignore invalid formats */ 2102 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2103 snd_mask_reset(&m, k); 2104 } 2105 return snd_mask_refine(mask, &m); 2106 } 2107 2108 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2109 struct snd_pcm_hw_rule *rule) 2110 { 2111 struct snd_interval t; 2112 unsigned int k; 2113 t.min = UINT_MAX; 2114 t.max = 0; 2115 t.openmin = 0; 2116 t.openmax = 0; 2117 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2118 int bits; 2119 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2120 continue; 2121 bits = snd_pcm_format_physical_width(k); 2122 if (bits <= 0) 2123 continue; /* ignore invalid formats */ 2124 if (t.min > (unsigned)bits) 2125 t.min = bits; 2126 if (t.max < (unsigned)bits) 2127 t.max = bits; 2128 } 2129 t.integer = 1; 2130 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2131 } 2132 2133 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2134 #error "Change this table" 2135 #endif 2136 2137 static const unsigned int rates[] = { 2138 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2139 48000, 64000, 88200, 96000, 176400, 192000 2140 }; 2141 2142 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2143 .count = ARRAY_SIZE(rates), 2144 .list = rates, 2145 }; 2146 2147 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2148 struct snd_pcm_hw_rule *rule) 2149 { 2150 struct snd_pcm_hardware *hw = rule->private; 2151 return snd_interval_list(hw_param_interval(params, rule->var), 2152 snd_pcm_known_rates.count, 2153 snd_pcm_known_rates.list, hw->rates); 2154 } 2155 2156 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2157 struct snd_pcm_hw_rule *rule) 2158 { 2159 struct snd_interval t; 2160 struct snd_pcm_substream *substream = rule->private; 2161 t.min = 0; 2162 t.max = substream->buffer_bytes_max; 2163 t.openmin = 0; 2164 t.openmax = 0; 2165 t.integer = 1; 2166 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2167 } 2168 2169 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2170 { 2171 struct snd_pcm_runtime *runtime = substream->runtime; 2172 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2173 int k, err; 2174 2175 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2176 snd_mask_any(constrs_mask(constrs, k)); 2177 } 2178 2179 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2180 snd_interval_any(constrs_interval(constrs, k)); 2181 } 2182 2183 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2184 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2185 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2186 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2187 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2188 2189 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2190 snd_pcm_hw_rule_format, NULL, 2191 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2192 if (err < 0) 2193 return err; 2194 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2195 snd_pcm_hw_rule_sample_bits, NULL, 2196 SNDRV_PCM_HW_PARAM_FORMAT, 2197 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2198 if (err < 0) 2199 return err; 2200 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2201 snd_pcm_hw_rule_div, NULL, 2202 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -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_mul, NULL, 2207 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2208 if (err < 0) 2209 return err; 2210 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2211 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2212 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2213 if (err < 0) 2214 return err; 2215 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2216 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2217 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2218 if (err < 0) 2219 return err; 2220 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2221 snd_pcm_hw_rule_div, NULL, 2222 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2223 if (err < 0) 2224 return err; 2225 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2226 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2227 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2228 if (err < 0) 2229 return err; 2230 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2231 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2232 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2233 if (err < 0) 2234 return err; 2235 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2236 snd_pcm_hw_rule_div, NULL, 2237 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -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_div, NULL, 2242 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2243 if (err < 0) 2244 return err; 2245 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2246 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2247 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2248 if (err < 0) 2249 return err; 2250 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2251 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2252 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -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_mul, NULL, 2257 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2258 if (err < 0) 2259 return err; 2260 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2261 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2262 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 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_SIZE, 2266 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2267 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2268 if (err < 0) 2269 return err; 2270 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2271 snd_pcm_hw_rule_muldivk, (void*) 8, 2272 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2273 if (err < 0) 2274 return err; 2275 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2276 snd_pcm_hw_rule_muldivk, (void*) 8, 2277 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2278 if (err < 0) 2279 return err; 2280 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2281 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2282 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2283 if (err < 0) 2284 return err; 2285 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2286 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2287 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2288 if (err < 0) 2289 return err; 2290 return 0; 2291 } 2292 2293 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2294 { 2295 struct snd_pcm_runtime *runtime = substream->runtime; 2296 struct snd_pcm_hardware *hw = &runtime->hw; 2297 int err; 2298 unsigned int mask = 0; 2299 2300 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2301 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2302 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2303 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2304 if (hw_support_mmap(substream)) { 2305 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2306 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2307 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2308 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2309 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2310 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2311 } 2312 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2313 if (err < 0) 2314 return err; 2315 2316 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2317 if (err < 0) 2318 return err; 2319 2320 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2321 if (err < 0) 2322 return err; 2323 2324 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2325 hw->channels_min, hw->channels_max); 2326 if (err < 0) 2327 return err; 2328 2329 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2330 hw->rate_min, hw->rate_max); 2331 if (err < 0) 2332 return err; 2333 2334 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2335 hw->period_bytes_min, hw->period_bytes_max); 2336 if (err < 0) 2337 return err; 2338 2339 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2340 hw->periods_min, hw->periods_max); 2341 if (err < 0) 2342 return err; 2343 2344 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2345 hw->period_bytes_min, hw->buffer_bytes_max); 2346 if (err < 0) 2347 return err; 2348 2349 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2350 snd_pcm_hw_rule_buffer_bytes_max, substream, 2351 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2352 if (err < 0) 2353 return err; 2354 2355 /* FIXME: remove */ 2356 if (runtime->dma_bytes) { 2357 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2358 if (err < 0) 2359 return err; 2360 } 2361 2362 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2363 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2364 snd_pcm_hw_rule_rate, hw, 2365 SNDRV_PCM_HW_PARAM_RATE, -1); 2366 if (err < 0) 2367 return err; 2368 } 2369 2370 /* FIXME: this belong to lowlevel */ 2371 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2372 2373 return 0; 2374 } 2375 2376 static void pcm_release_private(struct snd_pcm_substream *substream) 2377 { 2378 if (snd_pcm_stream_linked(substream)) 2379 snd_pcm_unlink(substream); 2380 } 2381 2382 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2383 { 2384 substream->ref_count--; 2385 if (substream->ref_count > 0) 2386 return; 2387 2388 snd_pcm_drop(substream); 2389 if (substream->hw_opened) { 2390 if (substream->ops->hw_free && 2391 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2392 substream->ops->hw_free(substream); 2393 substream->ops->close(substream); 2394 substream->hw_opened = 0; 2395 } 2396 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2397 pm_qos_remove_request(&substream->latency_pm_qos_req); 2398 if (substream->pcm_release) { 2399 substream->pcm_release(substream); 2400 substream->pcm_release = NULL; 2401 } 2402 snd_pcm_detach_substream(substream); 2403 } 2404 EXPORT_SYMBOL(snd_pcm_release_substream); 2405 2406 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2407 struct file *file, 2408 struct snd_pcm_substream **rsubstream) 2409 { 2410 struct snd_pcm_substream *substream; 2411 int err; 2412 2413 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2414 if (err < 0) 2415 return err; 2416 if (substream->ref_count > 1) { 2417 *rsubstream = substream; 2418 return 0; 2419 } 2420 2421 err = snd_pcm_hw_constraints_init(substream); 2422 if (err < 0) { 2423 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2424 goto error; 2425 } 2426 2427 if ((err = substream->ops->open(substream)) < 0) 2428 goto error; 2429 2430 substream->hw_opened = 1; 2431 2432 err = snd_pcm_hw_constraints_complete(substream); 2433 if (err < 0) { 2434 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2435 goto error; 2436 } 2437 2438 *rsubstream = substream; 2439 return 0; 2440 2441 error: 2442 snd_pcm_release_substream(substream); 2443 return err; 2444 } 2445 EXPORT_SYMBOL(snd_pcm_open_substream); 2446 2447 static int snd_pcm_open_file(struct file *file, 2448 struct snd_pcm *pcm, 2449 int stream) 2450 { 2451 struct snd_pcm_file *pcm_file; 2452 struct snd_pcm_substream *substream; 2453 int err; 2454 2455 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2456 if (err < 0) 2457 return err; 2458 2459 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2460 if (pcm_file == NULL) { 2461 snd_pcm_release_substream(substream); 2462 return -ENOMEM; 2463 } 2464 pcm_file->substream = substream; 2465 if (substream->ref_count == 1) { 2466 substream->file = pcm_file; 2467 substream->pcm_release = pcm_release_private; 2468 } 2469 file->private_data = pcm_file; 2470 2471 return 0; 2472 } 2473 2474 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2475 { 2476 struct snd_pcm *pcm; 2477 int err = nonseekable_open(inode, file); 2478 if (err < 0) 2479 return err; 2480 pcm = snd_lookup_minor_data(iminor(inode), 2481 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2482 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2483 if (pcm) 2484 snd_card_unref(pcm->card); 2485 return err; 2486 } 2487 2488 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2489 { 2490 struct snd_pcm *pcm; 2491 int err = nonseekable_open(inode, file); 2492 if (err < 0) 2493 return err; 2494 pcm = snd_lookup_minor_data(iminor(inode), 2495 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2496 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2497 if (pcm) 2498 snd_card_unref(pcm->card); 2499 return err; 2500 } 2501 2502 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2503 { 2504 int err; 2505 wait_queue_entry_t wait; 2506 2507 if (pcm == NULL) { 2508 err = -ENODEV; 2509 goto __error1; 2510 } 2511 err = snd_card_file_add(pcm->card, file); 2512 if (err < 0) 2513 goto __error1; 2514 if (!try_module_get(pcm->card->module)) { 2515 err = -EFAULT; 2516 goto __error2; 2517 } 2518 init_waitqueue_entry(&wait, current); 2519 add_wait_queue(&pcm->open_wait, &wait); 2520 mutex_lock(&pcm->open_mutex); 2521 while (1) { 2522 err = snd_pcm_open_file(file, pcm, stream); 2523 if (err >= 0) 2524 break; 2525 if (err == -EAGAIN) { 2526 if (file->f_flags & O_NONBLOCK) { 2527 err = -EBUSY; 2528 break; 2529 } 2530 } else 2531 break; 2532 set_current_state(TASK_INTERRUPTIBLE); 2533 mutex_unlock(&pcm->open_mutex); 2534 schedule(); 2535 mutex_lock(&pcm->open_mutex); 2536 if (pcm->card->shutdown) { 2537 err = -ENODEV; 2538 break; 2539 } 2540 if (signal_pending(current)) { 2541 err = -ERESTARTSYS; 2542 break; 2543 } 2544 } 2545 remove_wait_queue(&pcm->open_wait, &wait); 2546 mutex_unlock(&pcm->open_mutex); 2547 if (err < 0) 2548 goto __error; 2549 return err; 2550 2551 __error: 2552 module_put(pcm->card->module); 2553 __error2: 2554 snd_card_file_remove(pcm->card, file); 2555 __error1: 2556 return err; 2557 } 2558 2559 static int snd_pcm_release(struct inode *inode, struct file *file) 2560 { 2561 struct snd_pcm *pcm; 2562 struct snd_pcm_substream *substream; 2563 struct snd_pcm_file *pcm_file; 2564 2565 pcm_file = file->private_data; 2566 substream = pcm_file->substream; 2567 if (snd_BUG_ON(!substream)) 2568 return -ENXIO; 2569 pcm = substream->pcm; 2570 mutex_lock(&pcm->open_mutex); 2571 snd_pcm_release_substream(substream); 2572 kfree(pcm_file); 2573 mutex_unlock(&pcm->open_mutex); 2574 wake_up(&pcm->open_wait); 2575 module_put(pcm->card->module); 2576 snd_card_file_remove(pcm->card, file); 2577 return 0; 2578 } 2579 2580 /* check and update PCM state; return 0 or a negative error 2581 * call this inside PCM lock 2582 */ 2583 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2584 { 2585 switch (substream->runtime->status->state) { 2586 case SNDRV_PCM_STATE_DRAINING: 2587 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2588 return -EBADFD; 2589 /* Fall through */ 2590 case SNDRV_PCM_STATE_RUNNING: 2591 return snd_pcm_update_hw_ptr(substream); 2592 case SNDRV_PCM_STATE_PREPARED: 2593 case SNDRV_PCM_STATE_PAUSED: 2594 return 0; 2595 case SNDRV_PCM_STATE_SUSPENDED: 2596 return -ESTRPIPE; 2597 case SNDRV_PCM_STATE_XRUN: 2598 return -EPIPE; 2599 default: 2600 return -EBADFD; 2601 } 2602 } 2603 2604 /* increase the appl_ptr; returns the processed frames or a negative error */ 2605 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2606 snd_pcm_uframes_t frames, 2607 snd_pcm_sframes_t avail) 2608 { 2609 struct snd_pcm_runtime *runtime = substream->runtime; 2610 snd_pcm_sframes_t appl_ptr; 2611 int ret; 2612 2613 if (avail <= 0) 2614 return 0; 2615 if (frames > (snd_pcm_uframes_t)avail) 2616 frames = avail; 2617 appl_ptr = runtime->control->appl_ptr + frames; 2618 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2619 appl_ptr -= runtime->boundary; 2620 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2621 return ret < 0 ? ret : frames; 2622 } 2623 2624 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2625 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2626 snd_pcm_uframes_t frames, 2627 snd_pcm_sframes_t avail) 2628 { 2629 struct snd_pcm_runtime *runtime = substream->runtime; 2630 snd_pcm_sframes_t appl_ptr; 2631 int ret; 2632 2633 if (avail <= 0) 2634 return 0; 2635 if (frames > (snd_pcm_uframes_t)avail) 2636 frames = avail; 2637 appl_ptr = runtime->control->appl_ptr - frames; 2638 if (appl_ptr < 0) 2639 appl_ptr += runtime->boundary; 2640 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2641 /* NOTE: we return zero for errors because PulseAudio gets depressed 2642 * upon receiving an error from rewind ioctl and stops processing 2643 * any longer. Returning zero means that no rewind is done, so 2644 * it's not absolutely wrong to answer like that. 2645 */ 2646 return ret < 0 ? 0 : frames; 2647 } 2648 2649 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2650 snd_pcm_uframes_t frames) 2651 { 2652 snd_pcm_sframes_t ret; 2653 2654 if (frames == 0) 2655 return 0; 2656 2657 snd_pcm_stream_lock_irq(substream); 2658 ret = do_pcm_hwsync(substream); 2659 if (!ret) 2660 ret = rewind_appl_ptr(substream, frames, 2661 snd_pcm_hw_avail(substream)); 2662 snd_pcm_stream_unlock_irq(substream); 2663 return ret; 2664 } 2665 2666 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2667 snd_pcm_uframes_t frames) 2668 { 2669 snd_pcm_sframes_t ret; 2670 2671 if (frames == 0) 2672 return 0; 2673 2674 snd_pcm_stream_lock_irq(substream); 2675 ret = do_pcm_hwsync(substream); 2676 if (!ret) 2677 ret = forward_appl_ptr(substream, frames, 2678 snd_pcm_avail(substream)); 2679 snd_pcm_stream_unlock_irq(substream); 2680 return ret; 2681 } 2682 2683 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2684 { 2685 int err; 2686 2687 snd_pcm_stream_lock_irq(substream); 2688 err = do_pcm_hwsync(substream); 2689 snd_pcm_stream_unlock_irq(substream); 2690 return err; 2691 } 2692 2693 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2694 snd_pcm_sframes_t *delay) 2695 { 2696 int err; 2697 snd_pcm_sframes_t n = 0; 2698 2699 snd_pcm_stream_lock_irq(substream); 2700 err = do_pcm_hwsync(substream); 2701 if (!err) 2702 n = snd_pcm_calc_delay(substream); 2703 snd_pcm_stream_unlock_irq(substream); 2704 if (!err) 2705 *delay = n; 2706 return err; 2707 } 2708 2709 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2710 struct snd_pcm_sync_ptr __user *_sync_ptr) 2711 { 2712 struct snd_pcm_runtime *runtime = substream->runtime; 2713 struct snd_pcm_sync_ptr sync_ptr; 2714 volatile struct snd_pcm_mmap_status *status; 2715 volatile struct snd_pcm_mmap_control *control; 2716 int err; 2717 2718 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2719 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2720 return -EFAULT; 2721 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2722 return -EFAULT; 2723 status = runtime->status; 2724 control = runtime->control; 2725 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2726 err = snd_pcm_hwsync(substream); 2727 if (err < 0) 2728 return err; 2729 } 2730 snd_pcm_stream_lock_irq(substream); 2731 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2732 err = pcm_lib_apply_appl_ptr(substream, 2733 sync_ptr.c.control.appl_ptr); 2734 if (err < 0) { 2735 snd_pcm_stream_unlock_irq(substream); 2736 return err; 2737 } 2738 } else { 2739 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2740 } 2741 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2742 control->avail_min = sync_ptr.c.control.avail_min; 2743 else 2744 sync_ptr.c.control.avail_min = control->avail_min; 2745 sync_ptr.s.status.state = status->state; 2746 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2747 sync_ptr.s.status.tstamp = status->tstamp; 2748 sync_ptr.s.status.suspended_state = status->suspended_state; 2749 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2750 snd_pcm_stream_unlock_irq(substream); 2751 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2752 return -EFAULT; 2753 return 0; 2754 } 2755 2756 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2757 { 2758 struct snd_pcm_runtime *runtime = substream->runtime; 2759 int arg; 2760 2761 if (get_user(arg, _arg)) 2762 return -EFAULT; 2763 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2764 return -EINVAL; 2765 runtime->tstamp_type = arg; 2766 return 0; 2767 } 2768 2769 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 2770 struct snd_xferi __user *_xferi) 2771 { 2772 struct snd_xferi xferi; 2773 struct snd_pcm_runtime *runtime = substream->runtime; 2774 snd_pcm_sframes_t result; 2775 2776 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2777 return -EBADFD; 2778 if (put_user(0, &_xferi->result)) 2779 return -EFAULT; 2780 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2781 return -EFAULT; 2782 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2783 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2784 else 2785 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2786 __put_user(result, &_xferi->result); 2787 return result < 0 ? result : 0; 2788 } 2789 2790 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 2791 struct snd_xfern __user *_xfern) 2792 { 2793 struct snd_xfern xfern; 2794 struct snd_pcm_runtime *runtime = substream->runtime; 2795 void *bufs; 2796 snd_pcm_sframes_t result; 2797 2798 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2799 return -EBADFD; 2800 if (runtime->channels > 128) 2801 return -EINVAL; 2802 if (put_user(0, &_xfern->result)) 2803 return -EFAULT; 2804 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2805 return -EFAULT; 2806 2807 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 2808 if (IS_ERR(bufs)) 2809 return PTR_ERR(bufs); 2810 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2811 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2812 else 2813 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2814 kfree(bufs); 2815 __put_user(result, &_xfern->result); 2816 return result < 0 ? result : 0; 2817 } 2818 2819 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 2820 snd_pcm_uframes_t __user *_frames) 2821 { 2822 snd_pcm_uframes_t frames; 2823 snd_pcm_sframes_t result; 2824 2825 if (get_user(frames, _frames)) 2826 return -EFAULT; 2827 if (put_user(0, _frames)) 2828 return -EFAULT; 2829 result = snd_pcm_rewind(substream, frames); 2830 __put_user(result, _frames); 2831 return result < 0 ? result : 0; 2832 } 2833 2834 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 2835 snd_pcm_uframes_t __user *_frames) 2836 { 2837 snd_pcm_uframes_t frames; 2838 snd_pcm_sframes_t result; 2839 2840 if (get_user(frames, _frames)) 2841 return -EFAULT; 2842 if (put_user(0, _frames)) 2843 return -EFAULT; 2844 result = snd_pcm_forward(substream, frames); 2845 __put_user(result, _frames); 2846 return result < 0 ? result : 0; 2847 } 2848 2849 static int snd_pcm_common_ioctl(struct file *file, 2850 struct snd_pcm_substream *substream, 2851 unsigned int cmd, void __user *arg) 2852 { 2853 struct snd_pcm_file *pcm_file = file->private_data; 2854 int res; 2855 2856 if (PCM_RUNTIME_CHECK(substream)) 2857 return -ENXIO; 2858 2859 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 2860 if (res < 0) 2861 return res; 2862 2863 switch (cmd) { 2864 case SNDRV_PCM_IOCTL_PVERSION: 2865 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2866 case SNDRV_PCM_IOCTL_INFO: 2867 return snd_pcm_info_user(substream, arg); 2868 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2869 return 0; 2870 case SNDRV_PCM_IOCTL_TTSTAMP: 2871 return snd_pcm_tstamp(substream, arg); 2872 case SNDRV_PCM_IOCTL_USER_PVERSION: 2873 if (get_user(pcm_file->user_pversion, 2874 (unsigned int __user *)arg)) 2875 return -EFAULT; 2876 return 0; 2877 case SNDRV_PCM_IOCTL_HW_REFINE: 2878 return snd_pcm_hw_refine_user(substream, arg); 2879 case SNDRV_PCM_IOCTL_HW_PARAMS: 2880 return snd_pcm_hw_params_user(substream, arg); 2881 case SNDRV_PCM_IOCTL_HW_FREE: 2882 return snd_pcm_hw_free(substream); 2883 case SNDRV_PCM_IOCTL_SW_PARAMS: 2884 return snd_pcm_sw_params_user(substream, arg); 2885 case SNDRV_PCM_IOCTL_STATUS: 2886 return snd_pcm_status_user(substream, arg, false); 2887 case SNDRV_PCM_IOCTL_STATUS_EXT: 2888 return snd_pcm_status_user(substream, arg, true); 2889 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2890 return snd_pcm_channel_info_user(substream, arg); 2891 case SNDRV_PCM_IOCTL_PREPARE: 2892 return snd_pcm_prepare(substream, file); 2893 case SNDRV_PCM_IOCTL_RESET: 2894 return snd_pcm_reset(substream); 2895 case SNDRV_PCM_IOCTL_START: 2896 return snd_pcm_start_lock_irq(substream); 2897 case SNDRV_PCM_IOCTL_LINK: 2898 return snd_pcm_link(substream, (int)(unsigned long) arg); 2899 case SNDRV_PCM_IOCTL_UNLINK: 2900 return snd_pcm_unlink(substream); 2901 case SNDRV_PCM_IOCTL_RESUME: 2902 return snd_pcm_resume(substream); 2903 case SNDRV_PCM_IOCTL_XRUN: 2904 return snd_pcm_xrun(substream); 2905 case SNDRV_PCM_IOCTL_HWSYNC: 2906 return snd_pcm_hwsync(substream); 2907 case SNDRV_PCM_IOCTL_DELAY: 2908 { 2909 snd_pcm_sframes_t delay; 2910 snd_pcm_sframes_t __user *res = arg; 2911 int err; 2912 2913 err = snd_pcm_delay(substream, &delay); 2914 if (err) 2915 return err; 2916 if (put_user(delay, res)) 2917 return -EFAULT; 2918 return 0; 2919 } 2920 case SNDRV_PCM_IOCTL_SYNC_PTR: 2921 return snd_pcm_sync_ptr(substream, arg); 2922 #ifdef CONFIG_SND_SUPPORT_OLD_API 2923 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2924 return snd_pcm_hw_refine_old_user(substream, arg); 2925 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2926 return snd_pcm_hw_params_old_user(substream, arg); 2927 #endif 2928 case SNDRV_PCM_IOCTL_DRAIN: 2929 return snd_pcm_drain(substream, file); 2930 case SNDRV_PCM_IOCTL_DROP: 2931 return snd_pcm_drop(substream); 2932 case SNDRV_PCM_IOCTL_PAUSE: 2933 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2934 substream, 2935 (int)(unsigned long)arg); 2936 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2937 case SNDRV_PCM_IOCTL_READI_FRAMES: 2938 return snd_pcm_xferi_frames_ioctl(substream, arg); 2939 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2940 case SNDRV_PCM_IOCTL_READN_FRAMES: 2941 return snd_pcm_xfern_frames_ioctl(substream, arg); 2942 case SNDRV_PCM_IOCTL_REWIND: 2943 return snd_pcm_rewind_ioctl(substream, arg); 2944 case SNDRV_PCM_IOCTL_FORWARD: 2945 return snd_pcm_forward_ioctl(substream, arg); 2946 } 2947 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2948 return -ENOTTY; 2949 } 2950 2951 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 2952 unsigned long arg) 2953 { 2954 struct snd_pcm_file *pcm_file; 2955 2956 pcm_file = file->private_data; 2957 2958 if (((cmd >> 8) & 0xff) != 'A') 2959 return -ENOTTY; 2960 2961 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 2962 (void __user *)arg); 2963 } 2964 2965 /** 2966 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 2967 * @substream: PCM substream 2968 * @cmd: IOCTL cmd 2969 * @arg: IOCTL argument 2970 * 2971 * The function is provided primarily for OSS layer and USB gadget drivers, 2972 * and it allows only the limited set of ioctls (hw_params, sw_params, 2973 * prepare, start, drain, drop, forward). 2974 */ 2975 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2976 unsigned int cmd, void *arg) 2977 { 2978 snd_pcm_uframes_t *frames = arg; 2979 snd_pcm_sframes_t result; 2980 2981 switch (cmd) { 2982 case SNDRV_PCM_IOCTL_FORWARD: 2983 { 2984 /* provided only for OSS; capture-only and no value returned */ 2985 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 2986 return -EINVAL; 2987 result = snd_pcm_forward(substream, *frames); 2988 return result < 0 ? result : 0; 2989 } 2990 case SNDRV_PCM_IOCTL_HW_PARAMS: 2991 return snd_pcm_hw_params(substream, arg); 2992 case SNDRV_PCM_IOCTL_SW_PARAMS: 2993 return snd_pcm_sw_params(substream, arg); 2994 case SNDRV_PCM_IOCTL_PREPARE: 2995 return snd_pcm_prepare(substream, NULL); 2996 case SNDRV_PCM_IOCTL_START: 2997 return snd_pcm_start_lock_irq(substream); 2998 case SNDRV_PCM_IOCTL_DRAIN: 2999 return snd_pcm_drain(substream, NULL); 3000 case SNDRV_PCM_IOCTL_DROP: 3001 return snd_pcm_drop(substream); 3002 case SNDRV_PCM_IOCTL_DELAY: 3003 return snd_pcm_delay(substream, frames); 3004 default: 3005 return -EINVAL; 3006 } 3007 } 3008 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3009 3010 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3011 loff_t * offset) 3012 { 3013 struct snd_pcm_file *pcm_file; 3014 struct snd_pcm_substream *substream; 3015 struct snd_pcm_runtime *runtime; 3016 snd_pcm_sframes_t result; 3017 3018 pcm_file = file->private_data; 3019 substream = pcm_file->substream; 3020 if (PCM_RUNTIME_CHECK(substream)) 3021 return -ENXIO; 3022 runtime = substream->runtime; 3023 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3024 return -EBADFD; 3025 if (!frame_aligned(runtime, count)) 3026 return -EINVAL; 3027 count = bytes_to_frames(runtime, count); 3028 result = snd_pcm_lib_read(substream, buf, count); 3029 if (result > 0) 3030 result = frames_to_bytes(runtime, result); 3031 return result; 3032 } 3033 3034 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3035 size_t count, loff_t * offset) 3036 { 3037 struct snd_pcm_file *pcm_file; 3038 struct snd_pcm_substream *substream; 3039 struct snd_pcm_runtime *runtime; 3040 snd_pcm_sframes_t result; 3041 3042 pcm_file = file->private_data; 3043 substream = pcm_file->substream; 3044 if (PCM_RUNTIME_CHECK(substream)) 3045 return -ENXIO; 3046 runtime = substream->runtime; 3047 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3048 return -EBADFD; 3049 if (!frame_aligned(runtime, count)) 3050 return -EINVAL; 3051 count = bytes_to_frames(runtime, count); 3052 result = snd_pcm_lib_write(substream, buf, count); 3053 if (result > 0) 3054 result = frames_to_bytes(runtime, result); 3055 return result; 3056 } 3057 3058 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3059 { 3060 struct snd_pcm_file *pcm_file; 3061 struct snd_pcm_substream *substream; 3062 struct snd_pcm_runtime *runtime; 3063 snd_pcm_sframes_t result; 3064 unsigned long i; 3065 void __user **bufs; 3066 snd_pcm_uframes_t frames; 3067 3068 pcm_file = iocb->ki_filp->private_data; 3069 substream = pcm_file->substream; 3070 if (PCM_RUNTIME_CHECK(substream)) 3071 return -ENXIO; 3072 runtime = substream->runtime; 3073 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3074 return -EBADFD; 3075 if (!iter_is_iovec(to)) 3076 return -EINVAL; 3077 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3078 return -EINVAL; 3079 if (!frame_aligned(runtime, to->iov->iov_len)) 3080 return -EINVAL; 3081 frames = bytes_to_samples(runtime, to->iov->iov_len); 3082 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3083 if (bufs == NULL) 3084 return -ENOMEM; 3085 for (i = 0; i < to->nr_segs; ++i) 3086 bufs[i] = to->iov[i].iov_base; 3087 result = snd_pcm_lib_readv(substream, bufs, frames); 3088 if (result > 0) 3089 result = frames_to_bytes(runtime, result); 3090 kfree(bufs); 3091 return result; 3092 } 3093 3094 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3095 { 3096 struct snd_pcm_file *pcm_file; 3097 struct snd_pcm_substream *substream; 3098 struct snd_pcm_runtime *runtime; 3099 snd_pcm_sframes_t result; 3100 unsigned long i; 3101 void __user **bufs; 3102 snd_pcm_uframes_t frames; 3103 3104 pcm_file = iocb->ki_filp->private_data; 3105 substream = pcm_file->substream; 3106 if (PCM_RUNTIME_CHECK(substream)) 3107 return -ENXIO; 3108 runtime = substream->runtime; 3109 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3110 return -EBADFD; 3111 if (!iter_is_iovec(from)) 3112 return -EINVAL; 3113 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3114 !frame_aligned(runtime, from->iov->iov_len)) 3115 return -EINVAL; 3116 frames = bytes_to_samples(runtime, from->iov->iov_len); 3117 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3118 if (bufs == NULL) 3119 return -ENOMEM; 3120 for (i = 0; i < from->nr_segs; ++i) 3121 bufs[i] = from->iov[i].iov_base; 3122 result = snd_pcm_lib_writev(substream, bufs, frames); 3123 if (result > 0) 3124 result = frames_to_bytes(runtime, result); 3125 kfree(bufs); 3126 return result; 3127 } 3128 3129 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3130 { 3131 struct snd_pcm_file *pcm_file; 3132 struct snd_pcm_substream *substream; 3133 struct snd_pcm_runtime *runtime; 3134 __poll_t mask, ok; 3135 snd_pcm_uframes_t avail; 3136 3137 pcm_file = file->private_data; 3138 3139 substream = pcm_file->substream; 3140 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3141 ok = EPOLLOUT | EPOLLWRNORM; 3142 else 3143 ok = EPOLLIN | EPOLLRDNORM; 3144 if (PCM_RUNTIME_CHECK(substream)) 3145 return ok | EPOLLERR; 3146 3147 runtime = substream->runtime; 3148 poll_wait(file, &runtime->sleep, wait); 3149 3150 mask = 0; 3151 snd_pcm_stream_lock_irq(substream); 3152 avail = snd_pcm_avail(substream); 3153 switch (runtime->status->state) { 3154 case SNDRV_PCM_STATE_RUNNING: 3155 case SNDRV_PCM_STATE_PREPARED: 3156 case SNDRV_PCM_STATE_PAUSED: 3157 if (avail >= runtime->control->avail_min) 3158 mask = ok; 3159 break; 3160 case SNDRV_PCM_STATE_DRAINING: 3161 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3162 mask = ok; 3163 if (!avail) 3164 mask |= EPOLLERR; 3165 } 3166 break; 3167 default: 3168 mask = ok | EPOLLERR; 3169 break; 3170 } 3171 snd_pcm_stream_unlock_irq(substream); 3172 return mask; 3173 } 3174 3175 /* 3176 * mmap support 3177 */ 3178 3179 /* 3180 * Only on coherent architectures, we can mmap the status and the control records 3181 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3182 */ 3183 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3184 /* 3185 * mmap status record 3186 */ 3187 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3188 { 3189 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3190 struct snd_pcm_runtime *runtime; 3191 3192 if (substream == NULL) 3193 return VM_FAULT_SIGBUS; 3194 runtime = substream->runtime; 3195 vmf->page = virt_to_page(runtime->status); 3196 get_page(vmf->page); 3197 return 0; 3198 } 3199 3200 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3201 { 3202 .fault = snd_pcm_mmap_status_fault, 3203 }; 3204 3205 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3206 struct vm_area_struct *area) 3207 { 3208 long size; 3209 if (!(area->vm_flags & VM_READ)) 3210 return -EINVAL; 3211 size = area->vm_end - area->vm_start; 3212 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3213 return -EINVAL; 3214 area->vm_ops = &snd_pcm_vm_ops_status; 3215 area->vm_private_data = substream; 3216 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3217 return 0; 3218 } 3219 3220 /* 3221 * mmap control record 3222 */ 3223 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3224 { 3225 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3226 struct snd_pcm_runtime *runtime; 3227 3228 if (substream == NULL) 3229 return VM_FAULT_SIGBUS; 3230 runtime = substream->runtime; 3231 vmf->page = virt_to_page(runtime->control); 3232 get_page(vmf->page); 3233 return 0; 3234 } 3235 3236 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3237 { 3238 .fault = snd_pcm_mmap_control_fault, 3239 }; 3240 3241 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3242 struct vm_area_struct *area) 3243 { 3244 long size; 3245 if (!(area->vm_flags & VM_READ)) 3246 return -EINVAL; 3247 size = area->vm_end - area->vm_start; 3248 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3249 return -EINVAL; 3250 area->vm_ops = &snd_pcm_vm_ops_control; 3251 area->vm_private_data = substream; 3252 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3253 return 0; 3254 } 3255 3256 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3257 { 3258 if (pcm_file->no_compat_mmap) 3259 return false; 3260 /* See pcm_control_mmap_allowed() below. 3261 * Since older alsa-lib requires both status and control mmaps to be 3262 * coupled, we have to disable the status mmap for old alsa-lib, too. 3263 */ 3264 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3265 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3266 return false; 3267 return true; 3268 } 3269 3270 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3271 { 3272 if (pcm_file->no_compat_mmap) 3273 return false; 3274 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3275 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3276 * thus it effectively assures the manual update of appl_ptr. 3277 */ 3278 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3279 return false; 3280 return true; 3281 } 3282 3283 #else /* ! coherent mmap */ 3284 /* 3285 * don't support mmap for status and control records. 3286 */ 3287 #define pcm_status_mmap_allowed(pcm_file) false 3288 #define pcm_control_mmap_allowed(pcm_file) false 3289 3290 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3291 struct vm_area_struct *area) 3292 { 3293 return -ENXIO; 3294 } 3295 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3296 struct vm_area_struct *area) 3297 { 3298 return -ENXIO; 3299 } 3300 #endif /* coherent mmap */ 3301 3302 static inline struct page * 3303 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3304 { 3305 void *vaddr = substream->runtime->dma_area + ofs; 3306 return virt_to_page(vaddr); 3307 } 3308 3309 /* 3310 * fault callback for mmapping a RAM page 3311 */ 3312 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3313 { 3314 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3315 struct snd_pcm_runtime *runtime; 3316 unsigned long offset; 3317 struct page * page; 3318 size_t dma_bytes; 3319 3320 if (substream == NULL) 3321 return VM_FAULT_SIGBUS; 3322 runtime = substream->runtime; 3323 offset = vmf->pgoff << PAGE_SHIFT; 3324 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3325 if (offset > dma_bytes - PAGE_SIZE) 3326 return VM_FAULT_SIGBUS; 3327 if (substream->ops->page) 3328 page = substream->ops->page(substream, offset); 3329 else 3330 page = snd_pcm_default_page_ops(substream, offset); 3331 if (!page) 3332 return VM_FAULT_SIGBUS; 3333 get_page(page); 3334 vmf->page = page; 3335 return 0; 3336 } 3337 3338 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3339 .open = snd_pcm_mmap_data_open, 3340 .close = snd_pcm_mmap_data_close, 3341 }; 3342 3343 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3344 .open = snd_pcm_mmap_data_open, 3345 .close = snd_pcm_mmap_data_close, 3346 .fault = snd_pcm_mmap_data_fault, 3347 }; 3348 3349 /* 3350 * mmap the DMA buffer on RAM 3351 */ 3352 3353 /** 3354 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3355 * @substream: PCM substream 3356 * @area: VMA 3357 * 3358 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3359 * this function is invoked implicitly. 3360 */ 3361 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3362 struct vm_area_struct *area) 3363 { 3364 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3365 #ifdef CONFIG_GENERIC_ALLOCATOR 3366 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3367 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3368 return remap_pfn_range(area, area->vm_start, 3369 substream->dma_buffer.addr >> PAGE_SHIFT, 3370 area->vm_end - area->vm_start, area->vm_page_prot); 3371 } 3372 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3373 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3374 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3375 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3376 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3377 area, 3378 substream->runtime->dma_area, 3379 substream->runtime->dma_addr, 3380 substream->runtime->dma_bytes); 3381 #endif /* CONFIG_X86 */ 3382 /* mmap with fault handler */ 3383 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3384 return 0; 3385 } 3386 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3387 3388 /* 3389 * mmap the DMA buffer on I/O memory area 3390 */ 3391 #if SNDRV_PCM_INFO_MMAP_IOMEM 3392 /** 3393 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3394 * @substream: PCM substream 3395 * @area: VMA 3396 * 3397 * When your hardware uses the iomapped pages as the hardware buffer and 3398 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3399 * is supposed to work only on limited architectures. 3400 */ 3401 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3402 struct vm_area_struct *area) 3403 { 3404 struct snd_pcm_runtime *runtime = substream->runtime; 3405 3406 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3407 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3408 } 3409 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3410 #endif /* SNDRV_PCM_INFO_MMAP */ 3411 3412 /* 3413 * mmap DMA buffer 3414 */ 3415 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3416 struct vm_area_struct *area) 3417 { 3418 struct snd_pcm_runtime *runtime; 3419 long size; 3420 unsigned long offset; 3421 size_t dma_bytes; 3422 int err; 3423 3424 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3425 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3426 return -EINVAL; 3427 } else { 3428 if (!(area->vm_flags & VM_READ)) 3429 return -EINVAL; 3430 } 3431 runtime = substream->runtime; 3432 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3433 return -EBADFD; 3434 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3435 return -ENXIO; 3436 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3437 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3438 return -EINVAL; 3439 size = area->vm_end - area->vm_start; 3440 offset = area->vm_pgoff << PAGE_SHIFT; 3441 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3442 if ((size_t)size > dma_bytes) 3443 return -EINVAL; 3444 if (offset > dma_bytes - size) 3445 return -EINVAL; 3446 3447 area->vm_ops = &snd_pcm_vm_ops_data; 3448 area->vm_private_data = substream; 3449 if (substream->ops->mmap) 3450 err = substream->ops->mmap(substream, area); 3451 else 3452 err = snd_pcm_lib_default_mmap(substream, area); 3453 if (!err) 3454 atomic_inc(&substream->mmap_count); 3455 return err; 3456 } 3457 EXPORT_SYMBOL(snd_pcm_mmap_data); 3458 3459 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3460 { 3461 struct snd_pcm_file * pcm_file; 3462 struct snd_pcm_substream *substream; 3463 unsigned long offset; 3464 3465 pcm_file = file->private_data; 3466 substream = pcm_file->substream; 3467 if (PCM_RUNTIME_CHECK(substream)) 3468 return -ENXIO; 3469 3470 offset = area->vm_pgoff << PAGE_SHIFT; 3471 switch (offset) { 3472 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3473 if (!pcm_status_mmap_allowed(pcm_file)) 3474 return -ENXIO; 3475 return snd_pcm_mmap_status(substream, file, area); 3476 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3477 if (!pcm_control_mmap_allowed(pcm_file)) 3478 return -ENXIO; 3479 return snd_pcm_mmap_control(substream, file, area); 3480 default: 3481 return snd_pcm_mmap_data(substream, file, area); 3482 } 3483 return 0; 3484 } 3485 3486 static int snd_pcm_fasync(int fd, struct file * file, int on) 3487 { 3488 struct snd_pcm_file * pcm_file; 3489 struct snd_pcm_substream *substream; 3490 struct snd_pcm_runtime *runtime; 3491 3492 pcm_file = file->private_data; 3493 substream = pcm_file->substream; 3494 if (PCM_RUNTIME_CHECK(substream)) 3495 return -ENXIO; 3496 runtime = substream->runtime; 3497 return fasync_helper(fd, file, on, &runtime->fasync); 3498 } 3499 3500 /* 3501 * ioctl32 compat 3502 */ 3503 #ifdef CONFIG_COMPAT 3504 #include "pcm_compat.c" 3505 #else 3506 #define snd_pcm_ioctl_compat NULL 3507 #endif 3508 3509 /* 3510 * To be removed helpers to keep binary compatibility 3511 */ 3512 3513 #ifdef CONFIG_SND_SUPPORT_OLD_API 3514 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3515 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3516 3517 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3518 struct snd_pcm_hw_params_old *oparams) 3519 { 3520 unsigned int i; 3521 3522 memset(params, 0, sizeof(*params)); 3523 params->flags = oparams->flags; 3524 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3525 params->masks[i].bits[0] = oparams->masks[i]; 3526 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3527 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3528 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3529 params->info = oparams->info; 3530 params->msbits = oparams->msbits; 3531 params->rate_num = oparams->rate_num; 3532 params->rate_den = oparams->rate_den; 3533 params->fifo_size = oparams->fifo_size; 3534 } 3535 3536 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3537 struct snd_pcm_hw_params *params) 3538 { 3539 unsigned int i; 3540 3541 memset(oparams, 0, sizeof(*oparams)); 3542 oparams->flags = params->flags; 3543 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3544 oparams->masks[i] = params->masks[i].bits[0]; 3545 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3546 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3547 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3548 oparams->info = params->info; 3549 oparams->msbits = params->msbits; 3550 oparams->rate_num = params->rate_num; 3551 oparams->rate_den = params->rate_den; 3552 oparams->fifo_size = params->fifo_size; 3553 } 3554 3555 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3556 struct snd_pcm_hw_params_old __user * _oparams) 3557 { 3558 struct snd_pcm_hw_params *params; 3559 struct snd_pcm_hw_params_old *oparams = NULL; 3560 int err; 3561 3562 params = kmalloc(sizeof(*params), GFP_KERNEL); 3563 if (!params) 3564 return -ENOMEM; 3565 3566 oparams = memdup_user(_oparams, sizeof(*oparams)); 3567 if (IS_ERR(oparams)) { 3568 err = PTR_ERR(oparams); 3569 goto out; 3570 } 3571 snd_pcm_hw_convert_from_old_params(params, oparams); 3572 err = snd_pcm_hw_refine(substream, params); 3573 if (err < 0) 3574 goto out_old; 3575 3576 err = fixup_unreferenced_params(substream, params); 3577 if (err < 0) 3578 goto out_old; 3579 3580 snd_pcm_hw_convert_to_old_params(oparams, params); 3581 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3582 err = -EFAULT; 3583 out_old: 3584 kfree(oparams); 3585 out: 3586 kfree(params); 3587 return err; 3588 } 3589 3590 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3591 struct snd_pcm_hw_params_old __user * _oparams) 3592 { 3593 struct snd_pcm_hw_params *params; 3594 struct snd_pcm_hw_params_old *oparams = NULL; 3595 int err; 3596 3597 params = kmalloc(sizeof(*params), GFP_KERNEL); 3598 if (!params) 3599 return -ENOMEM; 3600 3601 oparams = memdup_user(_oparams, sizeof(*oparams)); 3602 if (IS_ERR(oparams)) { 3603 err = PTR_ERR(oparams); 3604 goto out; 3605 } 3606 3607 snd_pcm_hw_convert_from_old_params(params, oparams); 3608 err = snd_pcm_hw_params(substream, params); 3609 if (err < 0) 3610 goto out_old; 3611 3612 snd_pcm_hw_convert_to_old_params(oparams, params); 3613 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3614 err = -EFAULT; 3615 out_old: 3616 kfree(oparams); 3617 out: 3618 kfree(params); 3619 return err; 3620 } 3621 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3622 3623 #ifndef CONFIG_MMU 3624 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3625 unsigned long addr, 3626 unsigned long len, 3627 unsigned long pgoff, 3628 unsigned long flags) 3629 { 3630 struct snd_pcm_file *pcm_file = file->private_data; 3631 struct snd_pcm_substream *substream = pcm_file->substream; 3632 struct snd_pcm_runtime *runtime = substream->runtime; 3633 unsigned long offset = pgoff << PAGE_SHIFT; 3634 3635 switch (offset) { 3636 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3637 return (unsigned long)runtime->status; 3638 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3639 return (unsigned long)runtime->control; 3640 default: 3641 return (unsigned long)runtime->dma_area + offset; 3642 } 3643 } 3644 #else 3645 # define snd_pcm_get_unmapped_area NULL 3646 #endif 3647 3648 /* 3649 * Register section 3650 */ 3651 3652 const struct file_operations snd_pcm_f_ops[2] = { 3653 { 3654 .owner = THIS_MODULE, 3655 .write = snd_pcm_write, 3656 .write_iter = snd_pcm_writev, 3657 .open = snd_pcm_playback_open, 3658 .release = snd_pcm_release, 3659 .llseek = no_llseek, 3660 .poll = snd_pcm_poll, 3661 .unlocked_ioctl = snd_pcm_ioctl, 3662 .compat_ioctl = snd_pcm_ioctl_compat, 3663 .mmap = snd_pcm_mmap, 3664 .fasync = snd_pcm_fasync, 3665 .get_unmapped_area = snd_pcm_get_unmapped_area, 3666 }, 3667 { 3668 .owner = THIS_MODULE, 3669 .read = snd_pcm_read, 3670 .read_iter = snd_pcm_readv, 3671 .open = snd_pcm_capture_open, 3672 .release = snd_pcm_release, 3673 .llseek = no_llseek, 3674 .poll = snd_pcm_poll, 3675 .unlocked_ioctl = snd_pcm_ioctl, 3676 .compat_ioctl = snd_pcm_ioctl_compat, 3677 .mmap = snd_pcm_mmap, 3678 .fasync = snd_pcm_fasync, 3679 .get_unmapped_area = snd_pcm_get_unmapped_area, 3680 } 3681 }; 3682