1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/file.h> 25 #include <linux/slab.h> 26 #include <linux/sched/signal.h> 27 #include <linux/time.h> 28 #include <linux/pm_qos.h> 29 #include <linux/io.h> 30 #include <linux/dma-mapping.h> 31 #include <sound/core.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/pcm.h> 35 #include <sound/pcm_params.h> 36 #include <sound/timer.h> 37 #include <sound/minors.h> 38 #include <linux/uio.h> 39 40 #include "pcm_local.h" 41 42 #ifdef CONFIG_SND_DEBUG 43 #define CREATE_TRACE_POINTS 44 #include "pcm_param_trace.h" 45 #else 46 #define trace_hw_mask_param_enabled() 0 47 #define trace_hw_interval_param_enabled() 0 48 #define trace_hw_mask_param(substream, type, index, prev, curr) 49 #define trace_hw_interval_param(substream, type, index, prev, curr) 50 #endif 51 52 /* 53 * Compatibility 54 */ 55 56 struct snd_pcm_hw_params_old { 57 unsigned int flags; 58 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 59 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 60 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 61 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 62 unsigned int rmask; 63 unsigned int cmask; 64 unsigned int info; 65 unsigned int msbits; 66 unsigned int rate_num; 67 unsigned int rate_den; 68 snd_pcm_uframes_t fifo_size; 69 unsigned char reserved[64]; 70 }; 71 72 #ifdef CONFIG_SND_SUPPORT_OLD_API 73 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 74 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 75 76 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 77 struct snd_pcm_hw_params_old __user * _oparams); 78 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 79 struct snd_pcm_hw_params_old __user * _oparams); 80 #endif 81 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 82 83 /* 84 * 85 */ 86 87 static DEFINE_RWLOCK(snd_pcm_link_rwlock); 88 static DECLARE_RWSEM(snd_pcm_link_rwsem); 89 90 /* Writer in rwsem may block readers even during its waiting in queue, 91 * and this may lead to a deadlock when the code path takes read sem 92 * twice (e.g. one in snd_pcm_action_nonatomic() and another in 93 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to 94 * spin until it gets the lock. 95 */ 96 static inline void down_write_nonblock(struct rw_semaphore *lock) 97 { 98 while (!down_write_trylock(lock)) 99 cond_resched(); 100 } 101 102 /** 103 * snd_pcm_stream_lock - Lock the PCM stream 104 * @substream: PCM substream 105 * 106 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 107 * flag of the given substream. This also takes the global link rw lock 108 * (or rw sem), too, for avoiding the race with linked streams. 109 */ 110 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 111 { 112 if (substream->pcm->nonatomic) { 113 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING); 114 mutex_lock(&substream->self_group.mutex); 115 } else { 116 read_lock(&snd_pcm_link_rwlock); 117 spin_lock(&substream->self_group.lock); 118 } 119 } 120 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 121 122 /** 123 * snd_pcm_stream_lock - Unlock the PCM stream 124 * @substream: PCM substream 125 * 126 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 127 */ 128 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 129 { 130 if (substream->pcm->nonatomic) { 131 mutex_unlock(&substream->self_group.mutex); 132 up_read(&snd_pcm_link_rwsem); 133 } else { 134 spin_unlock(&substream->self_group.lock); 135 read_unlock(&snd_pcm_link_rwlock); 136 } 137 } 138 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 139 140 /** 141 * snd_pcm_stream_lock_irq - Lock the PCM stream 142 * @substream: PCM substream 143 * 144 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 145 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 146 * as snd_pcm_stream_lock(). 147 */ 148 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 149 { 150 if (!substream->pcm->nonatomic) 151 local_irq_disable(); 152 snd_pcm_stream_lock(substream); 153 } 154 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 155 156 /** 157 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 158 * @substream: PCM substream 159 * 160 * This is a counter-part of snd_pcm_stream_lock_irq(). 161 */ 162 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 163 { 164 snd_pcm_stream_unlock(substream); 165 if (!substream->pcm->nonatomic) 166 local_irq_enable(); 167 } 168 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 169 170 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 171 { 172 unsigned long flags = 0; 173 if (!substream->pcm->nonatomic) 174 local_irq_save(flags); 175 snd_pcm_stream_lock(substream); 176 return flags; 177 } 178 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 179 180 /** 181 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 182 * @substream: PCM substream 183 * @flags: irq flags 184 * 185 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 186 */ 187 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 188 unsigned long flags) 189 { 190 snd_pcm_stream_unlock(substream); 191 if (!substream->pcm->nonatomic) 192 local_irq_restore(flags); 193 } 194 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 195 196 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 197 { 198 struct snd_pcm_runtime *runtime; 199 struct snd_pcm *pcm = substream->pcm; 200 struct snd_pcm_str *pstr = substream->pstr; 201 202 memset(info, 0, sizeof(*info)); 203 info->card = pcm->card->number; 204 info->device = pcm->device; 205 info->stream = substream->stream; 206 info->subdevice = substream->number; 207 strlcpy(info->id, pcm->id, sizeof(info->id)); 208 strlcpy(info->name, pcm->name, sizeof(info->name)); 209 info->dev_class = pcm->dev_class; 210 info->dev_subclass = pcm->dev_subclass; 211 info->subdevices_count = pstr->substream_count; 212 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 213 strlcpy(info->subname, substream->name, sizeof(info->subname)); 214 runtime = substream->runtime; 215 216 return 0; 217 } 218 219 int snd_pcm_info_user(struct snd_pcm_substream *substream, 220 struct snd_pcm_info __user * _info) 221 { 222 struct snd_pcm_info *info; 223 int err; 224 225 info = kmalloc(sizeof(*info), GFP_KERNEL); 226 if (! info) 227 return -ENOMEM; 228 err = snd_pcm_info(substream, info); 229 if (err >= 0) { 230 if (copy_to_user(_info, info, sizeof(*info))) 231 err = -EFAULT; 232 } 233 kfree(info); 234 return err; 235 } 236 237 static bool hw_support_mmap(struct snd_pcm_substream *substream) 238 { 239 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 240 return false; 241 /* architecture supports dma_mmap_coherent()? */ 242 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA) 243 if (!substream->ops->mmap && 244 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 245 return false; 246 #endif 247 return true; 248 } 249 250 static int constrain_mask_params(struct snd_pcm_substream *substream, 251 struct snd_pcm_hw_params *params) 252 { 253 struct snd_pcm_hw_constraints *constrs = 254 &substream->runtime->hw_constraints; 255 struct snd_mask *m; 256 unsigned int k; 257 struct snd_mask old_mask; 258 int changed; 259 260 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 261 m = hw_param_mask(params, k); 262 if (snd_mask_empty(m)) 263 return -EINVAL; 264 265 /* This parameter is not requested to change by a caller. */ 266 if (!(params->rmask & (1 << k))) 267 continue; 268 269 if (trace_hw_mask_param_enabled()) 270 old_mask = *m; 271 272 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 273 if (changed < 0) 274 return changed; 275 if (changed == 0) 276 continue; 277 278 /* Set corresponding flag so that the caller gets it. */ 279 trace_hw_mask_param(substream, k, 0, &old_mask, m); 280 params->cmask |= 1 << k; 281 } 282 283 return 0; 284 } 285 286 static int constrain_interval_params(struct snd_pcm_substream *substream, 287 struct snd_pcm_hw_params *params) 288 { 289 struct snd_pcm_hw_constraints *constrs = 290 &substream->runtime->hw_constraints; 291 struct snd_interval *i; 292 unsigned int k; 293 struct snd_interval old_interval; 294 int changed; 295 296 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 297 i = hw_param_interval(params, k); 298 if (snd_interval_empty(i)) 299 return -EINVAL; 300 301 /* This parameter is not requested to change by a caller. */ 302 if (!(params->rmask & (1 << k))) 303 continue; 304 305 if (trace_hw_interval_param_enabled()) 306 old_interval = *i; 307 308 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 309 if (changed < 0) 310 return changed; 311 if (changed == 0) 312 continue; 313 314 /* Set corresponding flag so that the caller gets it. */ 315 trace_hw_interval_param(substream, k, 0, &old_interval, i); 316 params->cmask |= 1 << k; 317 } 318 319 return 0; 320 } 321 322 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 323 struct snd_pcm_hw_params *params) 324 { 325 struct snd_pcm_hw_constraints *constrs = 326 &substream->runtime->hw_constraints; 327 unsigned int k; 328 unsigned int rstamps[constrs->rules_num]; 329 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 330 unsigned int stamp; 331 struct snd_pcm_hw_rule *r; 332 unsigned int d; 333 struct snd_mask old_mask; 334 struct snd_interval old_interval; 335 bool again; 336 int changed; 337 338 /* 339 * Each application of rule has own sequence number. 340 * 341 * Each member of 'rstamps' array represents the sequence number of 342 * recent application of corresponding rule. 343 */ 344 for (k = 0; k < constrs->rules_num; k++) 345 rstamps[k] = 0; 346 347 /* 348 * Each member of 'vstamps' array represents the sequence number of 349 * recent application of rule in which corresponding parameters were 350 * changed. 351 * 352 * In initial state, elements corresponding to parameters requested by 353 * a caller is 1. For unrequested parameters, corresponding members 354 * have 0 so that the parameters are never changed anymore. 355 */ 356 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 357 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 358 359 /* Due to the above design, actual sequence number starts at 2. */ 360 stamp = 2; 361 retry: 362 /* Apply all rules in order. */ 363 again = false; 364 for (k = 0; k < constrs->rules_num; k++) { 365 r = &constrs->rules[k]; 366 367 /* 368 * Check condition bits of this rule. When the rule has 369 * some condition bits, parameter without the bits is 370 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 371 * is an example of the condition bits. 372 */ 373 if (r->cond && !(r->cond & params->flags)) 374 continue; 375 376 /* 377 * The 'deps' array includes maximum three dependencies 378 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 379 * member of this array is a sentinel and should be 380 * negative value. 381 * 382 * This rule should be processed in this time when dependent 383 * parameters were changed at former applications of the other 384 * rules. 385 */ 386 for (d = 0; r->deps[d] >= 0; d++) { 387 if (vstamps[r->deps[d]] > rstamps[k]) 388 break; 389 } 390 if (r->deps[d] < 0) 391 continue; 392 393 if (trace_hw_mask_param_enabled()) { 394 if (hw_is_mask(r->var)) 395 old_mask = *hw_param_mask(params, r->var); 396 } 397 if (trace_hw_interval_param_enabled()) { 398 if (hw_is_interval(r->var)) 399 old_interval = *hw_param_interval(params, r->var); 400 } 401 402 changed = r->func(params, r); 403 if (changed < 0) 404 return changed; 405 406 /* 407 * When the parameter is changed, notify it to the caller 408 * by corresponding returned bit, then preparing for next 409 * iteration. 410 */ 411 if (changed && r->var >= 0) { 412 if (hw_is_mask(r->var)) { 413 trace_hw_mask_param(substream, r->var, 414 k + 1, &old_mask, 415 hw_param_mask(params, r->var)); 416 } 417 if (hw_is_interval(r->var)) { 418 trace_hw_interval_param(substream, r->var, 419 k + 1, &old_interval, 420 hw_param_interval(params, r->var)); 421 } 422 423 params->cmask |= (1 << r->var); 424 vstamps[r->var] = stamp; 425 again = true; 426 } 427 428 rstamps[k] = stamp++; 429 } 430 431 /* Iterate to evaluate all rules till no parameters are changed. */ 432 if (again) 433 goto retry; 434 435 return 0; 436 } 437 438 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 439 struct snd_pcm_hw_params *params) 440 { 441 const struct snd_interval *i; 442 const struct snd_mask *m; 443 int err; 444 445 if (!params->msbits) { 446 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 447 if (snd_interval_single(i)) 448 params->msbits = snd_interval_value(i); 449 } 450 451 if (!params->rate_den) { 452 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 453 if (snd_interval_single(i)) { 454 params->rate_num = snd_interval_value(i); 455 params->rate_den = 1; 456 } 457 } 458 459 if (!params->fifo_size) { 460 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 461 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 462 if (snd_mask_single(m) && snd_interval_single(i)) { 463 err = substream->ops->ioctl(substream, 464 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 465 if (err < 0) 466 return err; 467 } 468 } 469 470 if (!params->info) { 471 params->info = substream->runtime->hw.info; 472 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 473 SNDRV_PCM_INFO_DRAIN_TRIGGER); 474 if (!hw_support_mmap(substream)) 475 params->info &= ~(SNDRV_PCM_INFO_MMAP | 476 SNDRV_PCM_INFO_MMAP_VALID); 477 } 478 479 return 0; 480 } 481 482 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 483 struct snd_pcm_hw_params *params) 484 { 485 int err; 486 487 params->info = 0; 488 params->fifo_size = 0; 489 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 490 params->msbits = 0; 491 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 492 params->rate_num = 0; 493 params->rate_den = 0; 494 } 495 496 err = constrain_mask_params(substream, params); 497 if (err < 0) 498 return err; 499 500 err = constrain_interval_params(substream, params); 501 if (err < 0) 502 return err; 503 504 err = constrain_params_by_rules(substream, params); 505 if (err < 0) 506 return err; 507 508 params->rmask = 0; 509 510 return 0; 511 } 512 EXPORT_SYMBOL(snd_pcm_hw_refine); 513 514 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 515 struct snd_pcm_hw_params __user * _params) 516 { 517 struct snd_pcm_hw_params *params; 518 int err; 519 520 params = memdup_user(_params, sizeof(*params)); 521 if (IS_ERR(params)) 522 return PTR_ERR(params); 523 524 err = snd_pcm_hw_refine(substream, params); 525 if (err < 0) 526 goto end; 527 528 err = fixup_unreferenced_params(substream, params); 529 if (err < 0) 530 goto end; 531 532 if (copy_to_user(_params, params, sizeof(*params))) 533 err = -EFAULT; 534 end: 535 kfree(params); 536 return err; 537 } 538 539 static int period_to_usecs(struct snd_pcm_runtime *runtime) 540 { 541 int usecs; 542 543 if (! runtime->rate) 544 return -1; /* invalid */ 545 546 /* take 75% of period time as the deadline */ 547 usecs = (750000 / runtime->rate) * runtime->period_size; 548 usecs += ((750000 % runtime->rate) * runtime->period_size) / 549 runtime->rate; 550 551 return usecs; 552 } 553 554 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 555 { 556 snd_pcm_stream_lock_irq(substream); 557 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 558 substream->runtime->status->state = state; 559 snd_pcm_stream_unlock_irq(substream); 560 } 561 562 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 563 int event) 564 { 565 #ifdef CONFIG_SND_PCM_TIMER 566 if (substream->timer) 567 snd_timer_notify(substream->timer, event, 568 &substream->runtime->trigger_tstamp); 569 #endif 570 } 571 572 /** 573 * snd_pcm_hw_param_choose - choose a configuration defined by @params 574 * @pcm: PCM instance 575 * @params: the hw_params instance 576 * 577 * Choose one configuration from configuration space defined by @params. 578 * The configuration chosen is that obtained fixing in this order: 579 * first access, first format, first subformat, min channels, 580 * min rate, min period time, max buffer size, min tick time 581 * 582 * Return: Zero if successful, or a negative error code on failure. 583 */ 584 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 585 struct snd_pcm_hw_params *params) 586 { 587 static const int vars[] = { 588 SNDRV_PCM_HW_PARAM_ACCESS, 589 SNDRV_PCM_HW_PARAM_FORMAT, 590 SNDRV_PCM_HW_PARAM_SUBFORMAT, 591 SNDRV_PCM_HW_PARAM_CHANNELS, 592 SNDRV_PCM_HW_PARAM_RATE, 593 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 594 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 595 SNDRV_PCM_HW_PARAM_TICK_TIME, 596 -1 597 }; 598 const int *v; 599 struct snd_mask old_mask; 600 struct snd_interval old_interval; 601 int changed; 602 603 for (v = vars; *v != -1; v++) { 604 /* Keep old parameter to trace. */ 605 if (trace_hw_mask_param_enabled()) { 606 if (hw_is_mask(*v)) 607 old_mask = *hw_param_mask(params, *v); 608 } 609 if (trace_hw_interval_param_enabled()) { 610 if (hw_is_interval(*v)) 611 old_interval = *hw_param_interval(params, *v); 612 } 613 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 614 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 615 else 616 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 617 if (snd_BUG_ON(changed < 0)) 618 return changed; 619 if (changed == 0) 620 continue; 621 622 /* Trace the changed parameter. */ 623 if (hw_is_mask(*v)) { 624 trace_hw_mask_param(pcm, *v, 0, &old_mask, 625 hw_param_mask(params, *v)); 626 } 627 if (hw_is_interval(*v)) { 628 trace_hw_interval_param(pcm, *v, 0, &old_interval, 629 hw_param_interval(params, *v)); 630 } 631 } 632 633 return 0; 634 } 635 636 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 637 struct snd_pcm_hw_params *params) 638 { 639 struct snd_pcm_runtime *runtime; 640 int err, usecs; 641 unsigned int bits; 642 snd_pcm_uframes_t frames; 643 644 if (PCM_RUNTIME_CHECK(substream)) 645 return -ENXIO; 646 runtime = substream->runtime; 647 snd_pcm_stream_lock_irq(substream); 648 switch (runtime->status->state) { 649 case SNDRV_PCM_STATE_OPEN: 650 case SNDRV_PCM_STATE_SETUP: 651 case SNDRV_PCM_STATE_PREPARED: 652 break; 653 default: 654 snd_pcm_stream_unlock_irq(substream); 655 return -EBADFD; 656 } 657 snd_pcm_stream_unlock_irq(substream); 658 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 659 if (!substream->oss.oss) 660 #endif 661 if (atomic_read(&substream->mmap_count)) 662 return -EBADFD; 663 664 params->rmask = ~0U; 665 err = snd_pcm_hw_refine(substream, params); 666 if (err < 0) 667 goto _error; 668 669 err = snd_pcm_hw_params_choose(substream, params); 670 if (err < 0) 671 goto _error; 672 673 err = fixup_unreferenced_params(substream, params); 674 if (err < 0) 675 goto _error; 676 677 if (substream->ops->hw_params != NULL) { 678 err = substream->ops->hw_params(substream, params); 679 if (err < 0) 680 goto _error; 681 } 682 683 runtime->access = params_access(params); 684 runtime->format = params_format(params); 685 runtime->subformat = params_subformat(params); 686 runtime->channels = params_channels(params); 687 runtime->rate = params_rate(params); 688 runtime->period_size = params_period_size(params); 689 runtime->periods = params_periods(params); 690 runtime->buffer_size = params_buffer_size(params); 691 runtime->info = params->info; 692 runtime->rate_num = params->rate_num; 693 runtime->rate_den = params->rate_den; 694 runtime->no_period_wakeup = 695 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 696 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 697 698 bits = snd_pcm_format_physical_width(runtime->format); 699 runtime->sample_bits = bits; 700 bits *= runtime->channels; 701 runtime->frame_bits = bits; 702 frames = 1; 703 while (bits % 8 != 0) { 704 bits *= 2; 705 frames *= 2; 706 } 707 runtime->byte_align = bits / 8; 708 runtime->min_align = frames; 709 710 /* Default sw params */ 711 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 712 runtime->period_step = 1; 713 runtime->control->avail_min = runtime->period_size; 714 runtime->start_threshold = 1; 715 runtime->stop_threshold = runtime->buffer_size; 716 runtime->silence_threshold = 0; 717 runtime->silence_size = 0; 718 runtime->boundary = runtime->buffer_size; 719 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 720 runtime->boundary *= 2; 721 722 snd_pcm_timer_resolution_change(substream); 723 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 724 725 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 726 pm_qos_remove_request(&substream->latency_pm_qos_req); 727 if ((usecs = period_to_usecs(runtime)) >= 0) 728 pm_qos_add_request(&substream->latency_pm_qos_req, 729 PM_QOS_CPU_DMA_LATENCY, usecs); 730 return 0; 731 _error: 732 /* hardware might be unusable from this time, 733 so we force application to retry to set 734 the correct hardware parameter settings */ 735 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 736 if (substream->ops->hw_free != NULL) 737 substream->ops->hw_free(substream); 738 return err; 739 } 740 741 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 742 struct snd_pcm_hw_params __user * _params) 743 { 744 struct snd_pcm_hw_params *params; 745 int err; 746 747 params = memdup_user(_params, sizeof(*params)); 748 if (IS_ERR(params)) 749 return PTR_ERR(params); 750 751 err = snd_pcm_hw_params(substream, params); 752 if (err < 0) 753 goto end; 754 755 if (copy_to_user(_params, params, sizeof(*params))) 756 err = -EFAULT; 757 end: 758 kfree(params); 759 return err; 760 } 761 762 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 763 { 764 struct snd_pcm_runtime *runtime; 765 int result = 0; 766 767 if (PCM_RUNTIME_CHECK(substream)) 768 return -ENXIO; 769 runtime = substream->runtime; 770 snd_pcm_stream_lock_irq(substream); 771 switch (runtime->status->state) { 772 case SNDRV_PCM_STATE_SETUP: 773 case SNDRV_PCM_STATE_PREPARED: 774 break; 775 default: 776 snd_pcm_stream_unlock_irq(substream); 777 return -EBADFD; 778 } 779 snd_pcm_stream_unlock_irq(substream); 780 if (atomic_read(&substream->mmap_count)) 781 return -EBADFD; 782 if (substream->ops->hw_free) 783 result = substream->ops->hw_free(substream); 784 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 785 pm_qos_remove_request(&substream->latency_pm_qos_req); 786 return result; 787 } 788 789 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 790 struct snd_pcm_sw_params *params) 791 { 792 struct snd_pcm_runtime *runtime; 793 int err; 794 795 if (PCM_RUNTIME_CHECK(substream)) 796 return -ENXIO; 797 runtime = substream->runtime; 798 snd_pcm_stream_lock_irq(substream); 799 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 800 snd_pcm_stream_unlock_irq(substream); 801 return -EBADFD; 802 } 803 snd_pcm_stream_unlock_irq(substream); 804 805 if (params->tstamp_mode < 0 || 806 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 807 return -EINVAL; 808 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 809 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 810 return -EINVAL; 811 if (params->avail_min == 0) 812 return -EINVAL; 813 if (params->silence_size >= runtime->boundary) { 814 if (params->silence_threshold != 0) 815 return -EINVAL; 816 } else { 817 if (params->silence_size > params->silence_threshold) 818 return -EINVAL; 819 if (params->silence_threshold > runtime->buffer_size) 820 return -EINVAL; 821 } 822 err = 0; 823 snd_pcm_stream_lock_irq(substream); 824 runtime->tstamp_mode = params->tstamp_mode; 825 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 826 runtime->tstamp_type = params->tstamp_type; 827 runtime->period_step = params->period_step; 828 runtime->control->avail_min = params->avail_min; 829 runtime->start_threshold = params->start_threshold; 830 runtime->stop_threshold = params->stop_threshold; 831 runtime->silence_threshold = params->silence_threshold; 832 runtime->silence_size = params->silence_size; 833 params->boundary = runtime->boundary; 834 if (snd_pcm_running(substream)) { 835 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 836 runtime->silence_size > 0) 837 snd_pcm_playback_silence(substream, ULONG_MAX); 838 err = snd_pcm_update_state(substream, runtime); 839 } 840 snd_pcm_stream_unlock_irq(substream); 841 return err; 842 } 843 844 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 845 struct snd_pcm_sw_params __user * _params) 846 { 847 struct snd_pcm_sw_params params; 848 int err; 849 if (copy_from_user(¶ms, _params, sizeof(params))) 850 return -EFAULT; 851 err = snd_pcm_sw_params(substream, ¶ms); 852 if (copy_to_user(_params, ¶ms, sizeof(params))) 853 return -EFAULT; 854 return err; 855 } 856 857 int snd_pcm_status(struct snd_pcm_substream *substream, 858 struct snd_pcm_status *status) 859 { 860 struct snd_pcm_runtime *runtime = substream->runtime; 861 862 snd_pcm_stream_lock_irq(substream); 863 864 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 865 &runtime->audio_tstamp_config); 866 867 /* backwards compatible behavior */ 868 if (runtime->audio_tstamp_config.type_requested == 869 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 870 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 871 runtime->audio_tstamp_config.type_requested = 872 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 873 else 874 runtime->audio_tstamp_config.type_requested = 875 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 876 runtime->audio_tstamp_report.valid = 0; 877 } else 878 runtime->audio_tstamp_report.valid = 1; 879 880 status->state = runtime->status->state; 881 status->suspended_state = runtime->status->suspended_state; 882 if (status->state == SNDRV_PCM_STATE_OPEN) 883 goto _end; 884 status->trigger_tstamp = runtime->trigger_tstamp; 885 if (snd_pcm_running(substream)) { 886 snd_pcm_update_hw_ptr(substream); 887 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 888 status->tstamp = runtime->status->tstamp; 889 status->driver_tstamp = runtime->driver_tstamp; 890 status->audio_tstamp = 891 runtime->status->audio_tstamp; 892 if (runtime->audio_tstamp_report.valid == 1) 893 /* backwards compatibility, no report provided in COMPAT mode */ 894 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 895 &status->audio_tstamp_accuracy, 896 &runtime->audio_tstamp_report); 897 898 goto _tstamp_end; 899 } 900 } else { 901 /* get tstamp only in fallback mode and only if enabled */ 902 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 903 snd_pcm_gettime(runtime, &status->tstamp); 904 } 905 _tstamp_end: 906 status->appl_ptr = runtime->control->appl_ptr; 907 status->hw_ptr = runtime->status->hw_ptr; 908 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 909 status->avail = snd_pcm_playback_avail(runtime); 910 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 911 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 912 status->delay = runtime->buffer_size - status->avail; 913 status->delay += runtime->delay; 914 } else 915 status->delay = 0; 916 } else { 917 status->avail = snd_pcm_capture_avail(runtime); 918 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 919 status->delay = status->avail + runtime->delay; 920 else 921 status->delay = 0; 922 } 923 status->avail_max = runtime->avail_max; 924 status->overrange = runtime->overrange; 925 runtime->avail_max = 0; 926 runtime->overrange = 0; 927 _end: 928 snd_pcm_stream_unlock_irq(substream); 929 return 0; 930 } 931 932 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 933 struct snd_pcm_status __user * _status, 934 bool ext) 935 { 936 struct snd_pcm_status status; 937 int res; 938 939 memset(&status, 0, sizeof(status)); 940 /* 941 * with extension, parameters are read/write, 942 * get audio_tstamp_data from user, 943 * ignore rest of status structure 944 */ 945 if (ext && get_user(status.audio_tstamp_data, 946 (u32 __user *)(&_status->audio_tstamp_data))) 947 return -EFAULT; 948 res = snd_pcm_status(substream, &status); 949 if (res < 0) 950 return res; 951 if (copy_to_user(_status, &status, sizeof(status))) 952 return -EFAULT; 953 return 0; 954 } 955 956 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 957 struct snd_pcm_channel_info * info) 958 { 959 struct snd_pcm_runtime *runtime; 960 unsigned int channel; 961 962 channel = info->channel; 963 runtime = substream->runtime; 964 snd_pcm_stream_lock_irq(substream); 965 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 966 snd_pcm_stream_unlock_irq(substream); 967 return -EBADFD; 968 } 969 snd_pcm_stream_unlock_irq(substream); 970 if (channel >= runtime->channels) 971 return -EINVAL; 972 memset(info, 0, sizeof(*info)); 973 info->channel = channel; 974 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 975 } 976 977 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 978 struct snd_pcm_channel_info __user * _info) 979 { 980 struct snd_pcm_channel_info info; 981 int res; 982 983 if (copy_from_user(&info, _info, sizeof(info))) 984 return -EFAULT; 985 res = snd_pcm_channel_info(substream, &info); 986 if (res < 0) 987 return res; 988 if (copy_to_user(_info, &info, sizeof(info))) 989 return -EFAULT; 990 return 0; 991 } 992 993 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 994 { 995 struct snd_pcm_runtime *runtime = substream->runtime; 996 if (runtime->trigger_master == NULL) 997 return; 998 if (runtime->trigger_master == substream) { 999 if (!runtime->trigger_tstamp_latched) 1000 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1001 } else { 1002 snd_pcm_trigger_tstamp(runtime->trigger_master); 1003 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1004 } 1005 runtime->trigger_master = NULL; 1006 } 1007 1008 struct action_ops { 1009 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1010 int (*do_action)(struct snd_pcm_substream *substream, int state); 1011 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1012 void (*post_action)(struct snd_pcm_substream *substream, int state); 1013 }; 1014 1015 /* 1016 * this functions is core for handling of linked stream 1017 * Note: the stream state might be changed also on failure 1018 * Note2: call with calling stream lock + link lock 1019 */ 1020 static int snd_pcm_action_group(const struct action_ops *ops, 1021 struct snd_pcm_substream *substream, 1022 int state, int do_lock) 1023 { 1024 struct snd_pcm_substream *s = NULL; 1025 struct snd_pcm_substream *s1; 1026 int res = 0, depth = 1; 1027 1028 snd_pcm_group_for_each_entry(s, substream) { 1029 if (do_lock && s != substream) { 1030 if (s->pcm->nonatomic) 1031 mutex_lock_nested(&s->self_group.mutex, depth); 1032 else 1033 spin_lock_nested(&s->self_group.lock, depth); 1034 depth++; 1035 } 1036 res = ops->pre_action(s, state); 1037 if (res < 0) 1038 goto _unlock; 1039 } 1040 snd_pcm_group_for_each_entry(s, substream) { 1041 res = ops->do_action(s, state); 1042 if (res < 0) { 1043 if (ops->undo_action) { 1044 snd_pcm_group_for_each_entry(s1, substream) { 1045 if (s1 == s) /* failed stream */ 1046 break; 1047 ops->undo_action(s1, state); 1048 } 1049 } 1050 s = NULL; /* unlock all */ 1051 goto _unlock; 1052 } 1053 } 1054 snd_pcm_group_for_each_entry(s, substream) { 1055 ops->post_action(s, state); 1056 } 1057 _unlock: 1058 if (do_lock) { 1059 /* unlock streams */ 1060 snd_pcm_group_for_each_entry(s1, substream) { 1061 if (s1 != substream) { 1062 if (s1->pcm->nonatomic) 1063 mutex_unlock(&s1->self_group.mutex); 1064 else 1065 spin_unlock(&s1->self_group.lock); 1066 } 1067 if (s1 == s) /* end */ 1068 break; 1069 } 1070 } 1071 return res; 1072 } 1073 1074 /* 1075 * Note: call with stream lock 1076 */ 1077 static int snd_pcm_action_single(const struct action_ops *ops, 1078 struct snd_pcm_substream *substream, 1079 int state) 1080 { 1081 int res; 1082 1083 res = ops->pre_action(substream, state); 1084 if (res < 0) 1085 return res; 1086 res = ops->do_action(substream, state); 1087 if (res == 0) 1088 ops->post_action(substream, state); 1089 else if (ops->undo_action) 1090 ops->undo_action(substream, state); 1091 return res; 1092 } 1093 1094 /* 1095 * Note: call with stream lock 1096 */ 1097 static int snd_pcm_action(const struct action_ops *ops, 1098 struct snd_pcm_substream *substream, 1099 int state) 1100 { 1101 int res; 1102 1103 if (!snd_pcm_stream_linked(substream)) 1104 return snd_pcm_action_single(ops, substream, state); 1105 1106 if (substream->pcm->nonatomic) { 1107 if (!mutex_trylock(&substream->group->mutex)) { 1108 mutex_unlock(&substream->self_group.mutex); 1109 mutex_lock(&substream->group->mutex); 1110 mutex_lock(&substream->self_group.mutex); 1111 } 1112 res = snd_pcm_action_group(ops, substream, state, 1); 1113 mutex_unlock(&substream->group->mutex); 1114 } else { 1115 if (!spin_trylock(&substream->group->lock)) { 1116 spin_unlock(&substream->self_group.lock); 1117 spin_lock(&substream->group->lock); 1118 spin_lock(&substream->self_group.lock); 1119 } 1120 res = snd_pcm_action_group(ops, substream, state, 1); 1121 spin_unlock(&substream->group->lock); 1122 } 1123 return res; 1124 } 1125 1126 /* 1127 * Note: don't use any locks before 1128 */ 1129 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1130 struct snd_pcm_substream *substream, 1131 int state) 1132 { 1133 int res; 1134 1135 snd_pcm_stream_lock_irq(substream); 1136 res = snd_pcm_action(ops, substream, state); 1137 snd_pcm_stream_unlock_irq(substream); 1138 return res; 1139 } 1140 1141 /* 1142 */ 1143 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1144 struct snd_pcm_substream *substream, 1145 int state) 1146 { 1147 int res; 1148 1149 down_read(&snd_pcm_link_rwsem); 1150 if (snd_pcm_stream_linked(substream)) 1151 res = snd_pcm_action_group(ops, substream, state, 0); 1152 else 1153 res = snd_pcm_action_single(ops, substream, state); 1154 up_read(&snd_pcm_link_rwsem); 1155 return res; 1156 } 1157 1158 /* 1159 * start callbacks 1160 */ 1161 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1162 { 1163 struct snd_pcm_runtime *runtime = substream->runtime; 1164 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1165 return -EBADFD; 1166 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1167 !snd_pcm_playback_data(substream)) 1168 return -EPIPE; 1169 runtime->trigger_tstamp_latched = false; 1170 runtime->trigger_master = substream; 1171 return 0; 1172 } 1173 1174 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1175 { 1176 if (substream->runtime->trigger_master != substream) 1177 return 0; 1178 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1179 } 1180 1181 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1182 { 1183 if (substream->runtime->trigger_master == substream) 1184 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1185 } 1186 1187 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1188 { 1189 struct snd_pcm_runtime *runtime = substream->runtime; 1190 snd_pcm_trigger_tstamp(substream); 1191 runtime->hw_ptr_jiffies = jiffies; 1192 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1193 runtime->rate; 1194 runtime->status->state = state; 1195 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1196 runtime->silence_size > 0) 1197 snd_pcm_playback_silence(substream, ULONG_MAX); 1198 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1199 } 1200 1201 static const struct action_ops snd_pcm_action_start = { 1202 .pre_action = snd_pcm_pre_start, 1203 .do_action = snd_pcm_do_start, 1204 .undo_action = snd_pcm_undo_start, 1205 .post_action = snd_pcm_post_start 1206 }; 1207 1208 /** 1209 * snd_pcm_start - start all linked streams 1210 * @substream: the PCM substream instance 1211 * 1212 * Return: Zero if successful, or a negative error code. 1213 * The stream lock must be acquired before calling this function. 1214 */ 1215 int snd_pcm_start(struct snd_pcm_substream *substream) 1216 { 1217 return snd_pcm_action(&snd_pcm_action_start, substream, 1218 SNDRV_PCM_STATE_RUNNING); 1219 } 1220 1221 /* take the stream lock and start the streams */ 1222 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1223 { 1224 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1225 SNDRV_PCM_STATE_RUNNING); 1226 } 1227 1228 /* 1229 * stop callbacks 1230 */ 1231 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1232 { 1233 struct snd_pcm_runtime *runtime = substream->runtime; 1234 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1235 return -EBADFD; 1236 runtime->trigger_master = substream; 1237 return 0; 1238 } 1239 1240 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1241 { 1242 if (substream->runtime->trigger_master == substream && 1243 snd_pcm_running(substream)) 1244 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1245 return 0; /* unconditonally stop all substreams */ 1246 } 1247 1248 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1249 { 1250 struct snd_pcm_runtime *runtime = substream->runtime; 1251 if (runtime->status->state != state) { 1252 snd_pcm_trigger_tstamp(substream); 1253 runtime->status->state = state; 1254 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1255 } 1256 wake_up(&runtime->sleep); 1257 wake_up(&runtime->tsleep); 1258 } 1259 1260 static const struct action_ops snd_pcm_action_stop = { 1261 .pre_action = snd_pcm_pre_stop, 1262 .do_action = snd_pcm_do_stop, 1263 .post_action = snd_pcm_post_stop 1264 }; 1265 1266 /** 1267 * snd_pcm_stop - try to stop all running streams in the substream group 1268 * @substream: the PCM substream instance 1269 * @state: PCM state after stopping the stream 1270 * 1271 * The state of each stream is then changed to the given state unconditionally. 1272 * 1273 * Return: Zero if successful, or a negative error code. 1274 */ 1275 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1276 { 1277 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1278 } 1279 EXPORT_SYMBOL(snd_pcm_stop); 1280 1281 /** 1282 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1283 * @substream: the PCM substream 1284 * 1285 * After stopping, the state is changed to SETUP. 1286 * Unlike snd_pcm_stop(), this affects only the given stream. 1287 * 1288 * Return: Zero if succesful, or a negative error code. 1289 */ 1290 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1291 { 1292 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1293 SNDRV_PCM_STATE_SETUP); 1294 } 1295 1296 /** 1297 * snd_pcm_stop_xrun - stop the running streams as XRUN 1298 * @substream: the PCM substream instance 1299 * 1300 * This stops the given running substream (and all linked substreams) as XRUN. 1301 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1302 * 1303 * Return: Zero if successful, or a negative error code. 1304 */ 1305 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1306 { 1307 unsigned long flags; 1308 int ret = 0; 1309 1310 snd_pcm_stream_lock_irqsave(substream, flags); 1311 if (snd_pcm_running(substream)) 1312 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1313 snd_pcm_stream_unlock_irqrestore(substream, flags); 1314 return ret; 1315 } 1316 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1317 1318 /* 1319 * pause callbacks 1320 */ 1321 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1322 { 1323 struct snd_pcm_runtime *runtime = substream->runtime; 1324 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1325 return -ENOSYS; 1326 if (push) { 1327 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1328 return -EBADFD; 1329 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1330 return -EBADFD; 1331 runtime->trigger_master = substream; 1332 return 0; 1333 } 1334 1335 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1336 { 1337 if (substream->runtime->trigger_master != substream) 1338 return 0; 1339 /* some drivers might use hw_ptr to recover from the pause - 1340 update the hw_ptr now */ 1341 if (push) 1342 snd_pcm_update_hw_ptr(substream); 1343 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1344 * a delta between the current jiffies, this gives a large enough 1345 * delta, effectively to skip the check once. 1346 */ 1347 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1348 return substream->ops->trigger(substream, 1349 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1350 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1351 } 1352 1353 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1354 { 1355 if (substream->runtime->trigger_master == substream) 1356 substream->ops->trigger(substream, 1357 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1358 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1359 } 1360 1361 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1362 { 1363 struct snd_pcm_runtime *runtime = substream->runtime; 1364 snd_pcm_trigger_tstamp(substream); 1365 if (push) { 1366 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1367 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1368 wake_up(&runtime->sleep); 1369 wake_up(&runtime->tsleep); 1370 } else { 1371 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1372 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1373 } 1374 } 1375 1376 static const struct action_ops snd_pcm_action_pause = { 1377 .pre_action = snd_pcm_pre_pause, 1378 .do_action = snd_pcm_do_pause, 1379 .undo_action = snd_pcm_undo_pause, 1380 .post_action = snd_pcm_post_pause 1381 }; 1382 1383 /* 1384 * Push/release the pause for all linked streams. 1385 */ 1386 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1387 { 1388 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1389 } 1390 1391 #ifdef CONFIG_PM 1392 /* suspend */ 1393 1394 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1395 { 1396 struct snd_pcm_runtime *runtime = substream->runtime; 1397 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1398 return -EBUSY; 1399 runtime->trigger_master = substream; 1400 return 0; 1401 } 1402 1403 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1404 { 1405 struct snd_pcm_runtime *runtime = substream->runtime; 1406 if (runtime->trigger_master != substream) 1407 return 0; 1408 if (! snd_pcm_running(substream)) 1409 return 0; 1410 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1411 return 0; /* suspend unconditionally */ 1412 } 1413 1414 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1415 { 1416 struct snd_pcm_runtime *runtime = substream->runtime; 1417 snd_pcm_trigger_tstamp(substream); 1418 runtime->status->suspended_state = runtime->status->state; 1419 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1420 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1421 wake_up(&runtime->sleep); 1422 wake_up(&runtime->tsleep); 1423 } 1424 1425 static const struct action_ops snd_pcm_action_suspend = { 1426 .pre_action = snd_pcm_pre_suspend, 1427 .do_action = snd_pcm_do_suspend, 1428 .post_action = snd_pcm_post_suspend 1429 }; 1430 1431 /** 1432 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1433 * @substream: the PCM substream 1434 * 1435 * After this call, all streams are changed to SUSPENDED state. 1436 * 1437 * Return: Zero if successful (or @substream is %NULL), or a negative error 1438 * code. 1439 */ 1440 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1441 { 1442 int err; 1443 unsigned long flags; 1444 1445 if (! substream) 1446 return 0; 1447 1448 snd_pcm_stream_lock_irqsave(substream, flags); 1449 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1450 snd_pcm_stream_unlock_irqrestore(substream, flags); 1451 return err; 1452 } 1453 EXPORT_SYMBOL(snd_pcm_suspend); 1454 1455 /** 1456 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1457 * @pcm: the PCM instance 1458 * 1459 * After this call, all streams are changed to SUSPENDED state. 1460 * 1461 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1462 */ 1463 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1464 { 1465 struct snd_pcm_substream *substream; 1466 int stream, err = 0; 1467 1468 if (! pcm) 1469 return 0; 1470 1471 for (stream = 0; stream < 2; stream++) { 1472 for (substream = pcm->streams[stream].substream; 1473 substream; substream = substream->next) { 1474 /* FIXME: the open/close code should lock this as well */ 1475 if (substream->runtime == NULL) 1476 continue; 1477 err = snd_pcm_suspend(substream); 1478 if (err < 0 && err != -EBUSY) 1479 return err; 1480 } 1481 } 1482 return 0; 1483 } 1484 EXPORT_SYMBOL(snd_pcm_suspend_all); 1485 1486 /* resume */ 1487 1488 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1489 { 1490 struct snd_pcm_runtime *runtime = substream->runtime; 1491 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1492 return -ENOSYS; 1493 runtime->trigger_master = substream; 1494 return 0; 1495 } 1496 1497 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1498 { 1499 struct snd_pcm_runtime *runtime = substream->runtime; 1500 if (runtime->trigger_master != substream) 1501 return 0; 1502 /* DMA not running previously? */ 1503 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1504 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1505 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1506 return 0; 1507 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1508 } 1509 1510 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1511 { 1512 if (substream->runtime->trigger_master == substream && 1513 snd_pcm_running(substream)) 1514 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1515 } 1516 1517 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1518 { 1519 struct snd_pcm_runtime *runtime = substream->runtime; 1520 snd_pcm_trigger_tstamp(substream); 1521 runtime->status->state = runtime->status->suspended_state; 1522 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1523 } 1524 1525 static const struct action_ops snd_pcm_action_resume = { 1526 .pre_action = snd_pcm_pre_resume, 1527 .do_action = snd_pcm_do_resume, 1528 .undo_action = snd_pcm_undo_resume, 1529 .post_action = snd_pcm_post_resume 1530 }; 1531 1532 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1533 { 1534 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1535 } 1536 1537 #else 1538 1539 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1540 { 1541 return -ENOSYS; 1542 } 1543 1544 #endif /* CONFIG_PM */ 1545 1546 /* 1547 * xrun ioctl 1548 * 1549 * Change the RUNNING stream(s) to XRUN state. 1550 */ 1551 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1552 { 1553 struct snd_pcm_runtime *runtime = substream->runtime; 1554 int result; 1555 1556 snd_pcm_stream_lock_irq(substream); 1557 switch (runtime->status->state) { 1558 case SNDRV_PCM_STATE_XRUN: 1559 result = 0; /* already there */ 1560 break; 1561 case SNDRV_PCM_STATE_RUNNING: 1562 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1563 break; 1564 default: 1565 result = -EBADFD; 1566 } 1567 snd_pcm_stream_unlock_irq(substream); 1568 return result; 1569 } 1570 1571 /* 1572 * reset ioctl 1573 */ 1574 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1575 { 1576 struct snd_pcm_runtime *runtime = substream->runtime; 1577 switch (runtime->status->state) { 1578 case SNDRV_PCM_STATE_RUNNING: 1579 case SNDRV_PCM_STATE_PREPARED: 1580 case SNDRV_PCM_STATE_PAUSED: 1581 case SNDRV_PCM_STATE_SUSPENDED: 1582 return 0; 1583 default: 1584 return -EBADFD; 1585 } 1586 } 1587 1588 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1589 { 1590 struct snd_pcm_runtime *runtime = substream->runtime; 1591 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1592 if (err < 0) 1593 return err; 1594 runtime->hw_ptr_base = 0; 1595 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1596 runtime->status->hw_ptr % runtime->period_size; 1597 runtime->silence_start = runtime->status->hw_ptr; 1598 runtime->silence_filled = 0; 1599 return 0; 1600 } 1601 1602 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1603 { 1604 struct snd_pcm_runtime *runtime = substream->runtime; 1605 runtime->control->appl_ptr = runtime->status->hw_ptr; 1606 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1607 runtime->silence_size > 0) 1608 snd_pcm_playback_silence(substream, ULONG_MAX); 1609 } 1610 1611 static const struct action_ops snd_pcm_action_reset = { 1612 .pre_action = snd_pcm_pre_reset, 1613 .do_action = snd_pcm_do_reset, 1614 .post_action = snd_pcm_post_reset 1615 }; 1616 1617 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1618 { 1619 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1620 } 1621 1622 /* 1623 * prepare ioctl 1624 */ 1625 /* we use the second argument for updating f_flags */ 1626 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1627 int f_flags) 1628 { 1629 struct snd_pcm_runtime *runtime = substream->runtime; 1630 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1631 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1632 return -EBADFD; 1633 if (snd_pcm_running(substream)) 1634 return -EBUSY; 1635 substream->f_flags = f_flags; 1636 return 0; 1637 } 1638 1639 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1640 { 1641 int err; 1642 err = substream->ops->prepare(substream); 1643 if (err < 0) 1644 return err; 1645 return snd_pcm_do_reset(substream, 0); 1646 } 1647 1648 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1649 { 1650 struct snd_pcm_runtime *runtime = substream->runtime; 1651 runtime->control->appl_ptr = runtime->status->hw_ptr; 1652 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1653 } 1654 1655 static const struct action_ops snd_pcm_action_prepare = { 1656 .pre_action = snd_pcm_pre_prepare, 1657 .do_action = snd_pcm_do_prepare, 1658 .post_action = snd_pcm_post_prepare 1659 }; 1660 1661 /** 1662 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1663 * @substream: the PCM substream instance 1664 * @file: file to refer f_flags 1665 * 1666 * Return: Zero if successful, or a negative error code. 1667 */ 1668 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1669 struct file *file) 1670 { 1671 int f_flags; 1672 1673 if (file) 1674 f_flags = file->f_flags; 1675 else 1676 f_flags = substream->f_flags; 1677 1678 snd_pcm_stream_lock_irq(substream); 1679 switch (substream->runtime->status->state) { 1680 case SNDRV_PCM_STATE_PAUSED: 1681 snd_pcm_pause(substream, 0); 1682 /* fallthru */ 1683 case SNDRV_PCM_STATE_SUSPENDED: 1684 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1685 break; 1686 } 1687 snd_pcm_stream_unlock_irq(substream); 1688 1689 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1690 substream, f_flags); 1691 } 1692 1693 /* 1694 * drain ioctl 1695 */ 1696 1697 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1698 { 1699 struct snd_pcm_runtime *runtime = substream->runtime; 1700 switch (runtime->status->state) { 1701 case SNDRV_PCM_STATE_OPEN: 1702 case SNDRV_PCM_STATE_DISCONNECTED: 1703 case SNDRV_PCM_STATE_SUSPENDED: 1704 return -EBADFD; 1705 } 1706 runtime->trigger_master = substream; 1707 return 0; 1708 } 1709 1710 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1711 { 1712 struct snd_pcm_runtime *runtime = substream->runtime; 1713 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1714 switch (runtime->status->state) { 1715 case SNDRV_PCM_STATE_PREPARED: 1716 /* start playback stream if possible */ 1717 if (! snd_pcm_playback_empty(substream)) { 1718 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1719 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1720 } else { 1721 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1722 } 1723 break; 1724 case SNDRV_PCM_STATE_RUNNING: 1725 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1726 break; 1727 case SNDRV_PCM_STATE_XRUN: 1728 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1729 break; 1730 default: 1731 break; 1732 } 1733 } else { 1734 /* stop running stream */ 1735 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1736 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1737 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1738 snd_pcm_do_stop(substream, new_state); 1739 snd_pcm_post_stop(substream, new_state); 1740 } 1741 } 1742 1743 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1744 runtime->trigger_master == substream && 1745 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1746 return substream->ops->trigger(substream, 1747 SNDRV_PCM_TRIGGER_DRAIN); 1748 1749 return 0; 1750 } 1751 1752 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1753 { 1754 } 1755 1756 static const struct action_ops snd_pcm_action_drain_init = { 1757 .pre_action = snd_pcm_pre_drain_init, 1758 .do_action = snd_pcm_do_drain_init, 1759 .post_action = snd_pcm_post_drain_init 1760 }; 1761 1762 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1763 1764 /* 1765 * Drain the stream(s). 1766 * When the substream is linked, sync until the draining of all playback streams 1767 * is finished. 1768 * After this call, all streams are supposed to be either SETUP or DRAINING 1769 * (capture only) state. 1770 */ 1771 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1772 struct file *file) 1773 { 1774 struct snd_card *card; 1775 struct snd_pcm_runtime *runtime; 1776 struct snd_pcm_substream *s; 1777 wait_queue_t wait; 1778 int result = 0; 1779 int nonblock = 0; 1780 1781 card = substream->pcm->card; 1782 runtime = substream->runtime; 1783 1784 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1785 return -EBADFD; 1786 1787 if (file) { 1788 if (file->f_flags & O_NONBLOCK) 1789 nonblock = 1; 1790 } else if (substream->f_flags & O_NONBLOCK) 1791 nonblock = 1; 1792 1793 down_read(&snd_pcm_link_rwsem); 1794 snd_pcm_stream_lock_irq(substream); 1795 /* resume pause */ 1796 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1797 snd_pcm_pause(substream, 0); 1798 1799 /* pre-start/stop - all running streams are changed to DRAINING state */ 1800 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1801 if (result < 0) 1802 goto unlock; 1803 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1804 if (nonblock) { 1805 result = -EAGAIN; 1806 goto unlock; 1807 } 1808 1809 for (;;) { 1810 long tout; 1811 struct snd_pcm_runtime *to_check; 1812 if (signal_pending(current)) { 1813 result = -ERESTARTSYS; 1814 break; 1815 } 1816 /* find a substream to drain */ 1817 to_check = NULL; 1818 snd_pcm_group_for_each_entry(s, substream) { 1819 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1820 continue; 1821 runtime = s->runtime; 1822 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1823 to_check = runtime; 1824 break; 1825 } 1826 } 1827 if (!to_check) 1828 break; /* all drained */ 1829 init_waitqueue_entry(&wait, current); 1830 add_wait_queue(&to_check->sleep, &wait); 1831 snd_pcm_stream_unlock_irq(substream); 1832 up_read(&snd_pcm_link_rwsem); 1833 snd_power_unlock(card); 1834 if (runtime->no_period_wakeup) 1835 tout = MAX_SCHEDULE_TIMEOUT; 1836 else { 1837 tout = 10; 1838 if (runtime->rate) { 1839 long t = runtime->period_size * 2 / runtime->rate; 1840 tout = max(t, tout); 1841 } 1842 tout = msecs_to_jiffies(tout * 1000); 1843 } 1844 tout = schedule_timeout_interruptible(tout); 1845 snd_power_lock(card); 1846 down_read(&snd_pcm_link_rwsem); 1847 snd_pcm_stream_lock_irq(substream); 1848 remove_wait_queue(&to_check->sleep, &wait); 1849 if (card->shutdown) { 1850 result = -ENODEV; 1851 break; 1852 } 1853 if (tout == 0) { 1854 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1855 result = -ESTRPIPE; 1856 else { 1857 dev_dbg(substream->pcm->card->dev, 1858 "playback drain error (DMA or IRQ trouble?)\n"); 1859 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1860 result = -EIO; 1861 } 1862 break; 1863 } 1864 } 1865 1866 unlock: 1867 snd_pcm_stream_unlock_irq(substream); 1868 up_read(&snd_pcm_link_rwsem); 1869 1870 return result; 1871 } 1872 1873 /* 1874 * drop ioctl 1875 * 1876 * Immediately put all linked substreams into SETUP state. 1877 */ 1878 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1879 { 1880 struct snd_pcm_runtime *runtime; 1881 int result = 0; 1882 1883 if (PCM_RUNTIME_CHECK(substream)) 1884 return -ENXIO; 1885 runtime = substream->runtime; 1886 1887 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1888 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1889 return -EBADFD; 1890 1891 snd_pcm_stream_lock_irq(substream); 1892 /* resume pause */ 1893 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1894 snd_pcm_pause(substream, 0); 1895 1896 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1897 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1898 snd_pcm_stream_unlock_irq(substream); 1899 1900 return result; 1901 } 1902 1903 1904 static bool is_pcm_file(struct file *file) 1905 { 1906 struct inode *inode = file_inode(file); 1907 unsigned int minor; 1908 1909 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1910 return false; 1911 minor = iminor(inode); 1912 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1913 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1914 } 1915 1916 /* 1917 * PCM link handling 1918 */ 1919 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1920 { 1921 int res = 0; 1922 struct snd_pcm_file *pcm_file; 1923 struct snd_pcm_substream *substream1; 1924 struct snd_pcm_group *group; 1925 struct fd f = fdget(fd); 1926 1927 if (!f.file) 1928 return -EBADFD; 1929 if (!is_pcm_file(f.file)) { 1930 res = -EBADFD; 1931 goto _badf; 1932 } 1933 pcm_file = f.file->private_data; 1934 substream1 = pcm_file->substream; 1935 group = kmalloc(sizeof(*group), GFP_KERNEL); 1936 if (!group) { 1937 res = -ENOMEM; 1938 goto _nolock; 1939 } 1940 down_write_nonblock(&snd_pcm_link_rwsem); 1941 write_lock_irq(&snd_pcm_link_rwlock); 1942 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1943 substream->runtime->status->state != substream1->runtime->status->state || 1944 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1945 res = -EBADFD; 1946 goto _end; 1947 } 1948 if (snd_pcm_stream_linked(substream1)) { 1949 res = -EALREADY; 1950 goto _end; 1951 } 1952 if (!snd_pcm_stream_linked(substream)) { 1953 substream->group = group; 1954 group = NULL; 1955 spin_lock_init(&substream->group->lock); 1956 mutex_init(&substream->group->mutex); 1957 INIT_LIST_HEAD(&substream->group->substreams); 1958 list_add_tail(&substream->link_list, &substream->group->substreams); 1959 substream->group->count = 1; 1960 } 1961 list_add_tail(&substream1->link_list, &substream->group->substreams); 1962 substream->group->count++; 1963 substream1->group = substream->group; 1964 _end: 1965 write_unlock_irq(&snd_pcm_link_rwlock); 1966 up_write(&snd_pcm_link_rwsem); 1967 _nolock: 1968 snd_card_unref(substream1->pcm->card); 1969 kfree(group); 1970 _badf: 1971 fdput(f); 1972 return res; 1973 } 1974 1975 static void relink_to_local(struct snd_pcm_substream *substream) 1976 { 1977 substream->group = &substream->self_group; 1978 INIT_LIST_HEAD(&substream->self_group.substreams); 1979 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1980 } 1981 1982 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1983 { 1984 struct snd_pcm_substream *s; 1985 int res = 0; 1986 1987 down_write_nonblock(&snd_pcm_link_rwsem); 1988 write_lock_irq(&snd_pcm_link_rwlock); 1989 if (!snd_pcm_stream_linked(substream)) { 1990 res = -EALREADY; 1991 goto _end; 1992 } 1993 list_del(&substream->link_list); 1994 substream->group->count--; 1995 if (substream->group->count == 1) { /* detach the last stream, too */ 1996 snd_pcm_group_for_each_entry(s, substream) { 1997 relink_to_local(s); 1998 break; 1999 } 2000 kfree(substream->group); 2001 } 2002 relink_to_local(substream); 2003 _end: 2004 write_unlock_irq(&snd_pcm_link_rwlock); 2005 up_write(&snd_pcm_link_rwsem); 2006 return res; 2007 } 2008 2009 /* 2010 * hw configurator 2011 */ 2012 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2013 struct snd_pcm_hw_rule *rule) 2014 { 2015 struct snd_interval t; 2016 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2017 hw_param_interval_c(params, rule->deps[1]), &t); 2018 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2019 } 2020 2021 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2022 struct snd_pcm_hw_rule *rule) 2023 { 2024 struct snd_interval t; 2025 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2026 hw_param_interval_c(params, rule->deps[1]), &t); 2027 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2028 } 2029 2030 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2031 struct snd_pcm_hw_rule *rule) 2032 { 2033 struct snd_interval t; 2034 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2035 hw_param_interval_c(params, rule->deps[1]), 2036 (unsigned long) rule->private, &t); 2037 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2038 } 2039 2040 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2041 struct snd_pcm_hw_rule *rule) 2042 { 2043 struct snd_interval t; 2044 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2045 (unsigned long) rule->private, 2046 hw_param_interval_c(params, rule->deps[1]), &t); 2047 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2048 } 2049 2050 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2051 struct snd_pcm_hw_rule *rule) 2052 { 2053 unsigned int k; 2054 const struct snd_interval *i = 2055 hw_param_interval_c(params, rule->deps[0]); 2056 struct snd_mask m; 2057 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2058 snd_mask_any(&m); 2059 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2060 int bits; 2061 if (! snd_mask_test(mask, k)) 2062 continue; 2063 bits = snd_pcm_format_physical_width(k); 2064 if (bits <= 0) 2065 continue; /* ignore invalid formats */ 2066 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2067 snd_mask_reset(&m, k); 2068 } 2069 return snd_mask_refine(mask, &m); 2070 } 2071 2072 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2073 struct snd_pcm_hw_rule *rule) 2074 { 2075 struct snd_interval t; 2076 unsigned int k; 2077 t.min = UINT_MAX; 2078 t.max = 0; 2079 t.openmin = 0; 2080 t.openmax = 0; 2081 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2082 int bits; 2083 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2084 continue; 2085 bits = snd_pcm_format_physical_width(k); 2086 if (bits <= 0) 2087 continue; /* ignore invalid formats */ 2088 if (t.min > (unsigned)bits) 2089 t.min = bits; 2090 if (t.max < (unsigned)bits) 2091 t.max = bits; 2092 } 2093 t.integer = 1; 2094 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2095 } 2096 2097 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2098 #error "Change this table" 2099 #endif 2100 2101 static const unsigned int rates[] = { 2102 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2103 48000, 64000, 88200, 96000, 176400, 192000 2104 }; 2105 2106 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2107 .count = ARRAY_SIZE(rates), 2108 .list = rates, 2109 }; 2110 2111 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2112 struct snd_pcm_hw_rule *rule) 2113 { 2114 struct snd_pcm_hardware *hw = rule->private; 2115 return snd_interval_list(hw_param_interval(params, rule->var), 2116 snd_pcm_known_rates.count, 2117 snd_pcm_known_rates.list, hw->rates); 2118 } 2119 2120 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2121 struct snd_pcm_hw_rule *rule) 2122 { 2123 struct snd_interval t; 2124 struct snd_pcm_substream *substream = rule->private; 2125 t.min = 0; 2126 t.max = substream->buffer_bytes_max; 2127 t.openmin = 0; 2128 t.openmax = 0; 2129 t.integer = 1; 2130 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2131 } 2132 2133 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2134 { 2135 struct snd_pcm_runtime *runtime = substream->runtime; 2136 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2137 int k, err; 2138 2139 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2140 snd_mask_any(constrs_mask(constrs, k)); 2141 } 2142 2143 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2144 snd_interval_any(constrs_interval(constrs, k)); 2145 } 2146 2147 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2148 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2149 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2150 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2151 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2152 2153 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2154 snd_pcm_hw_rule_format, NULL, 2155 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2156 if (err < 0) 2157 return err; 2158 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2159 snd_pcm_hw_rule_sample_bits, NULL, 2160 SNDRV_PCM_HW_PARAM_FORMAT, 2161 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2162 if (err < 0) 2163 return err; 2164 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2165 snd_pcm_hw_rule_div, NULL, 2166 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2167 if (err < 0) 2168 return err; 2169 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2170 snd_pcm_hw_rule_mul, NULL, 2171 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2172 if (err < 0) 2173 return err; 2174 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2175 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2176 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2177 if (err < 0) 2178 return err; 2179 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2180 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2181 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2182 if (err < 0) 2183 return err; 2184 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2185 snd_pcm_hw_rule_div, NULL, 2186 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2187 if (err < 0) 2188 return err; 2189 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2190 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2191 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2192 if (err < 0) 2193 return err; 2194 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2195 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2196 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2197 if (err < 0) 2198 return err; 2199 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2200 snd_pcm_hw_rule_div, NULL, 2201 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2202 if (err < 0) 2203 return err; 2204 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2205 snd_pcm_hw_rule_div, NULL, 2206 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2207 if (err < 0) 2208 return err; 2209 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2210 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2211 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2212 if (err < 0) 2213 return err; 2214 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2215 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2216 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2217 if (err < 0) 2218 return err; 2219 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2220 snd_pcm_hw_rule_mul, NULL, 2221 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2222 if (err < 0) 2223 return err; 2224 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2225 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2226 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2227 if (err < 0) 2228 return err; 2229 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2230 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2231 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2232 if (err < 0) 2233 return err; 2234 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2235 snd_pcm_hw_rule_muldivk, (void*) 8, 2236 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2237 if (err < 0) 2238 return err; 2239 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2240 snd_pcm_hw_rule_muldivk, (void*) 8, 2241 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2242 if (err < 0) 2243 return err; 2244 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2245 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2246 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2247 if (err < 0) 2248 return err; 2249 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2250 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2251 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2252 if (err < 0) 2253 return err; 2254 return 0; 2255 } 2256 2257 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2258 { 2259 struct snd_pcm_runtime *runtime = substream->runtime; 2260 struct snd_pcm_hardware *hw = &runtime->hw; 2261 int err; 2262 unsigned int mask = 0; 2263 2264 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2265 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2266 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2267 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2268 if (hw_support_mmap(substream)) { 2269 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2270 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2271 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2272 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2273 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2274 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2275 } 2276 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2277 if (err < 0) 2278 return err; 2279 2280 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2281 if (err < 0) 2282 return err; 2283 2284 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2285 if (err < 0) 2286 return err; 2287 2288 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2289 hw->channels_min, hw->channels_max); 2290 if (err < 0) 2291 return err; 2292 2293 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2294 hw->rate_min, hw->rate_max); 2295 if (err < 0) 2296 return err; 2297 2298 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2299 hw->period_bytes_min, hw->period_bytes_max); 2300 if (err < 0) 2301 return err; 2302 2303 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2304 hw->periods_min, hw->periods_max); 2305 if (err < 0) 2306 return err; 2307 2308 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2309 hw->period_bytes_min, hw->buffer_bytes_max); 2310 if (err < 0) 2311 return err; 2312 2313 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2314 snd_pcm_hw_rule_buffer_bytes_max, substream, 2315 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2316 if (err < 0) 2317 return err; 2318 2319 /* FIXME: remove */ 2320 if (runtime->dma_bytes) { 2321 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2322 if (err < 0) 2323 return err; 2324 } 2325 2326 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2327 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2328 snd_pcm_hw_rule_rate, hw, 2329 SNDRV_PCM_HW_PARAM_RATE, -1); 2330 if (err < 0) 2331 return err; 2332 } 2333 2334 /* FIXME: this belong to lowlevel */ 2335 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2336 2337 return 0; 2338 } 2339 2340 static void pcm_release_private(struct snd_pcm_substream *substream) 2341 { 2342 snd_pcm_unlink(substream); 2343 } 2344 2345 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2346 { 2347 substream->ref_count--; 2348 if (substream->ref_count > 0) 2349 return; 2350 2351 snd_pcm_drop(substream); 2352 if (substream->hw_opened) { 2353 if (substream->ops->hw_free && 2354 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2355 substream->ops->hw_free(substream); 2356 substream->ops->close(substream); 2357 substream->hw_opened = 0; 2358 } 2359 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2360 pm_qos_remove_request(&substream->latency_pm_qos_req); 2361 if (substream->pcm_release) { 2362 substream->pcm_release(substream); 2363 substream->pcm_release = NULL; 2364 } 2365 snd_pcm_detach_substream(substream); 2366 } 2367 EXPORT_SYMBOL(snd_pcm_release_substream); 2368 2369 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2370 struct file *file, 2371 struct snd_pcm_substream **rsubstream) 2372 { 2373 struct snd_pcm_substream *substream; 2374 int err; 2375 2376 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2377 if (err < 0) 2378 return err; 2379 if (substream->ref_count > 1) { 2380 *rsubstream = substream; 2381 return 0; 2382 } 2383 2384 err = snd_pcm_hw_constraints_init(substream); 2385 if (err < 0) { 2386 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2387 goto error; 2388 } 2389 2390 if ((err = substream->ops->open(substream)) < 0) 2391 goto error; 2392 2393 substream->hw_opened = 1; 2394 2395 err = snd_pcm_hw_constraints_complete(substream); 2396 if (err < 0) { 2397 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2398 goto error; 2399 } 2400 2401 *rsubstream = substream; 2402 return 0; 2403 2404 error: 2405 snd_pcm_release_substream(substream); 2406 return err; 2407 } 2408 EXPORT_SYMBOL(snd_pcm_open_substream); 2409 2410 static int snd_pcm_open_file(struct file *file, 2411 struct snd_pcm *pcm, 2412 int stream) 2413 { 2414 struct snd_pcm_file *pcm_file; 2415 struct snd_pcm_substream *substream; 2416 int err; 2417 2418 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2419 if (err < 0) 2420 return err; 2421 2422 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2423 if (pcm_file == NULL) { 2424 snd_pcm_release_substream(substream); 2425 return -ENOMEM; 2426 } 2427 pcm_file->substream = substream; 2428 if (substream->ref_count == 1) { 2429 substream->file = pcm_file; 2430 substream->pcm_release = pcm_release_private; 2431 } 2432 file->private_data = pcm_file; 2433 2434 return 0; 2435 } 2436 2437 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2438 { 2439 struct snd_pcm *pcm; 2440 int err = nonseekable_open(inode, file); 2441 if (err < 0) 2442 return err; 2443 pcm = snd_lookup_minor_data(iminor(inode), 2444 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2445 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2446 if (pcm) 2447 snd_card_unref(pcm->card); 2448 return err; 2449 } 2450 2451 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2452 { 2453 struct snd_pcm *pcm; 2454 int err = nonseekable_open(inode, file); 2455 if (err < 0) 2456 return err; 2457 pcm = snd_lookup_minor_data(iminor(inode), 2458 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2459 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2460 if (pcm) 2461 snd_card_unref(pcm->card); 2462 return err; 2463 } 2464 2465 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2466 { 2467 int err; 2468 wait_queue_t wait; 2469 2470 if (pcm == NULL) { 2471 err = -ENODEV; 2472 goto __error1; 2473 } 2474 err = snd_card_file_add(pcm->card, file); 2475 if (err < 0) 2476 goto __error1; 2477 if (!try_module_get(pcm->card->module)) { 2478 err = -EFAULT; 2479 goto __error2; 2480 } 2481 init_waitqueue_entry(&wait, current); 2482 add_wait_queue(&pcm->open_wait, &wait); 2483 mutex_lock(&pcm->open_mutex); 2484 while (1) { 2485 err = snd_pcm_open_file(file, pcm, stream); 2486 if (err >= 0) 2487 break; 2488 if (err == -EAGAIN) { 2489 if (file->f_flags & O_NONBLOCK) { 2490 err = -EBUSY; 2491 break; 2492 } 2493 } else 2494 break; 2495 set_current_state(TASK_INTERRUPTIBLE); 2496 mutex_unlock(&pcm->open_mutex); 2497 schedule(); 2498 mutex_lock(&pcm->open_mutex); 2499 if (pcm->card->shutdown) { 2500 err = -ENODEV; 2501 break; 2502 } 2503 if (signal_pending(current)) { 2504 err = -ERESTARTSYS; 2505 break; 2506 } 2507 } 2508 remove_wait_queue(&pcm->open_wait, &wait); 2509 mutex_unlock(&pcm->open_mutex); 2510 if (err < 0) 2511 goto __error; 2512 return err; 2513 2514 __error: 2515 module_put(pcm->card->module); 2516 __error2: 2517 snd_card_file_remove(pcm->card, file); 2518 __error1: 2519 return err; 2520 } 2521 2522 static int snd_pcm_release(struct inode *inode, struct file *file) 2523 { 2524 struct snd_pcm *pcm; 2525 struct snd_pcm_substream *substream; 2526 struct snd_pcm_file *pcm_file; 2527 2528 pcm_file = file->private_data; 2529 substream = pcm_file->substream; 2530 if (snd_BUG_ON(!substream)) 2531 return -ENXIO; 2532 pcm = substream->pcm; 2533 mutex_lock(&pcm->open_mutex); 2534 snd_pcm_release_substream(substream); 2535 kfree(pcm_file); 2536 mutex_unlock(&pcm->open_mutex); 2537 wake_up(&pcm->open_wait); 2538 module_put(pcm->card->module); 2539 snd_card_file_remove(pcm->card, file); 2540 return 0; 2541 } 2542 2543 /* check and update PCM state; return 0 or a negative error 2544 * call this inside PCM lock 2545 */ 2546 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2547 { 2548 switch (substream->runtime->status->state) { 2549 case SNDRV_PCM_STATE_DRAINING: 2550 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2551 return -EBADFD; 2552 /* Fall through */ 2553 case SNDRV_PCM_STATE_RUNNING: 2554 return snd_pcm_update_hw_ptr(substream); 2555 case SNDRV_PCM_STATE_PREPARED: 2556 case SNDRV_PCM_STATE_PAUSED: 2557 return 0; 2558 case SNDRV_PCM_STATE_SUSPENDED: 2559 return -ESTRPIPE; 2560 case SNDRV_PCM_STATE_XRUN: 2561 return -EPIPE; 2562 default: 2563 return -EBADFD; 2564 } 2565 } 2566 2567 /* increase the appl_ptr; returns the processed frames or a negative error */ 2568 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2569 snd_pcm_uframes_t frames, 2570 snd_pcm_sframes_t avail) 2571 { 2572 struct snd_pcm_runtime *runtime = substream->runtime; 2573 snd_pcm_sframes_t appl_ptr; 2574 int ret; 2575 2576 if (avail <= 0) 2577 return 0; 2578 if (frames > (snd_pcm_uframes_t)avail) 2579 frames = avail; 2580 appl_ptr = runtime->control->appl_ptr + frames; 2581 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2582 appl_ptr -= runtime->boundary; 2583 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2584 return ret < 0 ? ret : frames; 2585 } 2586 2587 /* decrease the appl_ptr; returns the processed frames or a negative error */ 2588 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2589 snd_pcm_uframes_t frames, 2590 snd_pcm_sframes_t avail) 2591 { 2592 struct snd_pcm_runtime *runtime = substream->runtime; 2593 snd_pcm_sframes_t appl_ptr; 2594 int ret; 2595 2596 if (avail <= 0) 2597 return 0; 2598 if (frames > (snd_pcm_uframes_t)avail) 2599 frames = avail; 2600 appl_ptr = runtime->control->appl_ptr - frames; 2601 if (appl_ptr < 0) 2602 appl_ptr += runtime->boundary; 2603 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2604 return ret < 0 ? ret : frames; 2605 } 2606 2607 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2608 snd_pcm_uframes_t frames) 2609 { 2610 struct snd_pcm_runtime *runtime = substream->runtime; 2611 snd_pcm_sframes_t ret; 2612 2613 if (frames == 0) 2614 return 0; 2615 2616 snd_pcm_stream_lock_irq(substream); 2617 ret = do_pcm_hwsync(substream); 2618 if (!ret) 2619 ret = rewind_appl_ptr(substream, frames, 2620 snd_pcm_playback_hw_avail(runtime)); 2621 snd_pcm_stream_unlock_irq(substream); 2622 return ret; 2623 } 2624 2625 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2626 snd_pcm_uframes_t frames) 2627 { 2628 struct snd_pcm_runtime *runtime = substream->runtime; 2629 snd_pcm_sframes_t ret; 2630 2631 if (frames == 0) 2632 return 0; 2633 2634 snd_pcm_stream_lock_irq(substream); 2635 ret = do_pcm_hwsync(substream); 2636 if (!ret) 2637 ret = rewind_appl_ptr(substream, frames, 2638 snd_pcm_capture_hw_avail(runtime)); 2639 snd_pcm_stream_unlock_irq(substream); 2640 return ret; 2641 } 2642 2643 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2644 snd_pcm_uframes_t frames) 2645 { 2646 struct snd_pcm_runtime *runtime = substream->runtime; 2647 snd_pcm_sframes_t ret; 2648 2649 if (frames == 0) 2650 return 0; 2651 2652 snd_pcm_stream_lock_irq(substream); 2653 ret = do_pcm_hwsync(substream); 2654 if (!ret) 2655 ret = forward_appl_ptr(substream, frames, 2656 snd_pcm_playback_avail(runtime)); 2657 snd_pcm_stream_unlock_irq(substream); 2658 return ret; 2659 } 2660 2661 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2662 snd_pcm_uframes_t frames) 2663 { 2664 struct snd_pcm_runtime *runtime = substream->runtime; 2665 snd_pcm_sframes_t ret; 2666 2667 if (frames == 0) 2668 return 0; 2669 2670 snd_pcm_stream_lock_irq(substream); 2671 ret = do_pcm_hwsync(substream); 2672 if (!ret) 2673 ret = forward_appl_ptr(substream, frames, 2674 snd_pcm_capture_avail(runtime)); 2675 snd_pcm_stream_unlock_irq(substream); 2676 return ret; 2677 } 2678 2679 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2680 { 2681 int err; 2682 2683 snd_pcm_stream_lock_irq(substream); 2684 err = do_pcm_hwsync(substream); 2685 snd_pcm_stream_unlock_irq(substream); 2686 return err; 2687 } 2688 2689 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream) 2690 { 2691 struct snd_pcm_runtime *runtime = substream->runtime; 2692 int err; 2693 snd_pcm_sframes_t n = 0; 2694 2695 snd_pcm_stream_lock_irq(substream); 2696 err = do_pcm_hwsync(substream); 2697 if (!err) { 2698 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2699 n = snd_pcm_playback_hw_avail(runtime); 2700 else 2701 n = snd_pcm_capture_avail(runtime); 2702 n += runtime->delay; 2703 } 2704 snd_pcm_stream_unlock_irq(substream); 2705 return err < 0 ? err : n; 2706 } 2707 2708 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2709 struct snd_pcm_sync_ptr __user *_sync_ptr) 2710 { 2711 struct snd_pcm_runtime *runtime = substream->runtime; 2712 struct snd_pcm_sync_ptr sync_ptr; 2713 volatile struct snd_pcm_mmap_status *status; 2714 volatile struct snd_pcm_mmap_control *control; 2715 int err; 2716 2717 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2718 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2719 return -EFAULT; 2720 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2721 return -EFAULT; 2722 status = runtime->status; 2723 control = runtime->control; 2724 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2725 err = snd_pcm_hwsync(substream); 2726 if (err < 0) 2727 return err; 2728 } 2729 snd_pcm_stream_lock_irq(substream); 2730 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2731 err = pcm_lib_apply_appl_ptr(substream, 2732 sync_ptr.c.control.appl_ptr); 2733 if (err < 0) { 2734 snd_pcm_stream_unlock_irq(substream); 2735 return err; 2736 } 2737 } else { 2738 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2739 } 2740 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2741 control->avail_min = sync_ptr.c.control.avail_min; 2742 else 2743 sync_ptr.c.control.avail_min = control->avail_min; 2744 sync_ptr.s.status.state = status->state; 2745 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2746 sync_ptr.s.status.tstamp = status->tstamp; 2747 sync_ptr.s.status.suspended_state = status->suspended_state; 2748 snd_pcm_stream_unlock_irq(substream); 2749 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2750 return -EFAULT; 2751 return 0; 2752 } 2753 2754 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2755 { 2756 struct snd_pcm_runtime *runtime = substream->runtime; 2757 int arg; 2758 2759 if (get_user(arg, _arg)) 2760 return -EFAULT; 2761 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2762 return -EINVAL; 2763 runtime->tstamp_type = arg; 2764 return 0; 2765 } 2766 2767 static int snd_pcm_common_ioctl(struct file *file, 2768 struct snd_pcm_substream *substream, 2769 unsigned int cmd, void __user *arg) 2770 { 2771 struct snd_pcm_file *pcm_file = file->private_data; 2772 2773 switch (cmd) { 2774 case SNDRV_PCM_IOCTL_PVERSION: 2775 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2776 case SNDRV_PCM_IOCTL_INFO: 2777 return snd_pcm_info_user(substream, arg); 2778 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2779 return 0; 2780 case SNDRV_PCM_IOCTL_TTSTAMP: 2781 return snd_pcm_tstamp(substream, arg); 2782 case SNDRV_PCM_IOCTL_USER_PVERSION: 2783 if (get_user(pcm_file->user_pversion, 2784 (unsigned int __user *)arg)) 2785 return -EFAULT; 2786 return 0; 2787 case SNDRV_PCM_IOCTL_HW_REFINE: 2788 return snd_pcm_hw_refine_user(substream, arg); 2789 case SNDRV_PCM_IOCTL_HW_PARAMS: 2790 return snd_pcm_hw_params_user(substream, arg); 2791 case SNDRV_PCM_IOCTL_HW_FREE: 2792 return snd_pcm_hw_free(substream); 2793 case SNDRV_PCM_IOCTL_SW_PARAMS: 2794 return snd_pcm_sw_params_user(substream, arg); 2795 case SNDRV_PCM_IOCTL_STATUS: 2796 return snd_pcm_status_user(substream, arg, false); 2797 case SNDRV_PCM_IOCTL_STATUS_EXT: 2798 return snd_pcm_status_user(substream, arg, true); 2799 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2800 return snd_pcm_channel_info_user(substream, arg); 2801 case SNDRV_PCM_IOCTL_PREPARE: 2802 return snd_pcm_prepare(substream, file); 2803 case SNDRV_PCM_IOCTL_RESET: 2804 return snd_pcm_reset(substream); 2805 case SNDRV_PCM_IOCTL_START: 2806 return snd_pcm_start_lock_irq(substream); 2807 case SNDRV_PCM_IOCTL_LINK: 2808 return snd_pcm_link(substream, (int)(unsigned long) arg); 2809 case SNDRV_PCM_IOCTL_UNLINK: 2810 return snd_pcm_unlink(substream); 2811 case SNDRV_PCM_IOCTL_RESUME: 2812 return snd_pcm_resume(substream); 2813 case SNDRV_PCM_IOCTL_XRUN: 2814 return snd_pcm_xrun(substream); 2815 case SNDRV_PCM_IOCTL_HWSYNC: 2816 return snd_pcm_hwsync(substream); 2817 case SNDRV_PCM_IOCTL_DELAY: 2818 { 2819 snd_pcm_sframes_t delay = snd_pcm_delay(substream); 2820 snd_pcm_sframes_t __user *res = arg; 2821 2822 if (delay < 0) 2823 return delay; 2824 if (put_user(delay, res)) 2825 return -EFAULT; 2826 return 0; 2827 } 2828 case SNDRV_PCM_IOCTL_SYNC_PTR: 2829 return snd_pcm_sync_ptr(substream, arg); 2830 #ifdef CONFIG_SND_SUPPORT_OLD_API 2831 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2832 return snd_pcm_hw_refine_old_user(substream, arg); 2833 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2834 return snd_pcm_hw_params_old_user(substream, arg); 2835 #endif 2836 case SNDRV_PCM_IOCTL_DRAIN: 2837 return snd_pcm_drain(substream, file); 2838 case SNDRV_PCM_IOCTL_DROP: 2839 return snd_pcm_drop(substream); 2840 case SNDRV_PCM_IOCTL_PAUSE: 2841 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2842 substream, 2843 (int)(unsigned long)arg); 2844 } 2845 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2846 return -ENOTTY; 2847 } 2848 2849 static int snd_pcm_common_ioctl1(struct file *file, 2850 struct snd_pcm_substream *substream, 2851 unsigned int cmd, void __user *arg) 2852 { 2853 struct snd_card *card = substream->pcm->card; 2854 int res; 2855 2856 snd_power_lock(card); 2857 res = snd_power_wait(card, SNDRV_CTL_POWER_D0); 2858 if (res >= 0) 2859 res = snd_pcm_common_ioctl(file, substream, cmd, arg); 2860 snd_power_unlock(card); 2861 return res; 2862 } 2863 2864 static int snd_pcm_playback_ioctl1(struct file *file, 2865 struct snd_pcm_substream *substream, 2866 unsigned int cmd, void __user *arg) 2867 { 2868 if (PCM_RUNTIME_CHECK(substream)) 2869 return -ENXIO; 2870 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2871 return -EINVAL; 2872 switch (cmd) { 2873 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2874 { 2875 struct snd_xferi xferi; 2876 struct snd_xferi __user *_xferi = arg; 2877 struct snd_pcm_runtime *runtime = substream->runtime; 2878 snd_pcm_sframes_t result; 2879 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2880 return -EBADFD; 2881 if (put_user(0, &_xferi->result)) 2882 return -EFAULT; 2883 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2884 return -EFAULT; 2885 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2886 __put_user(result, &_xferi->result); 2887 return result < 0 ? result : 0; 2888 } 2889 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2890 { 2891 struct snd_xfern xfern; 2892 struct snd_xfern __user *_xfern = arg; 2893 struct snd_pcm_runtime *runtime = substream->runtime; 2894 void __user **bufs; 2895 snd_pcm_sframes_t result; 2896 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2897 return -EBADFD; 2898 if (runtime->channels > 128) 2899 return -EINVAL; 2900 if (put_user(0, &_xfern->result)) 2901 return -EFAULT; 2902 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2903 return -EFAULT; 2904 2905 bufs = memdup_user(xfern.bufs, 2906 sizeof(void *) * runtime->channels); 2907 if (IS_ERR(bufs)) 2908 return PTR_ERR(bufs); 2909 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2910 kfree(bufs); 2911 __put_user(result, &_xfern->result); 2912 return result < 0 ? result : 0; 2913 } 2914 case SNDRV_PCM_IOCTL_REWIND: 2915 { 2916 snd_pcm_uframes_t frames; 2917 snd_pcm_uframes_t __user *_frames = arg; 2918 snd_pcm_sframes_t result; 2919 if (get_user(frames, _frames)) 2920 return -EFAULT; 2921 if (put_user(0, _frames)) 2922 return -EFAULT; 2923 result = snd_pcm_playback_rewind(substream, frames); 2924 __put_user(result, _frames); 2925 return result < 0 ? result : 0; 2926 } 2927 case SNDRV_PCM_IOCTL_FORWARD: 2928 { 2929 snd_pcm_uframes_t frames; 2930 snd_pcm_uframes_t __user *_frames = arg; 2931 snd_pcm_sframes_t result; 2932 if (get_user(frames, _frames)) 2933 return -EFAULT; 2934 if (put_user(0, _frames)) 2935 return -EFAULT; 2936 result = snd_pcm_playback_forward(substream, frames); 2937 __put_user(result, _frames); 2938 return result < 0 ? result : 0; 2939 } 2940 } 2941 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2942 } 2943 2944 static int snd_pcm_capture_ioctl1(struct file *file, 2945 struct snd_pcm_substream *substream, 2946 unsigned int cmd, void __user *arg) 2947 { 2948 if (PCM_RUNTIME_CHECK(substream)) 2949 return -ENXIO; 2950 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2951 return -EINVAL; 2952 switch (cmd) { 2953 case SNDRV_PCM_IOCTL_READI_FRAMES: 2954 { 2955 struct snd_xferi xferi; 2956 struct snd_xferi __user *_xferi = arg; 2957 struct snd_pcm_runtime *runtime = substream->runtime; 2958 snd_pcm_sframes_t result; 2959 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2960 return -EBADFD; 2961 if (put_user(0, &_xferi->result)) 2962 return -EFAULT; 2963 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2964 return -EFAULT; 2965 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2966 __put_user(result, &_xferi->result); 2967 return result < 0 ? result : 0; 2968 } 2969 case SNDRV_PCM_IOCTL_READN_FRAMES: 2970 { 2971 struct snd_xfern xfern; 2972 struct snd_xfern __user *_xfern = arg; 2973 struct snd_pcm_runtime *runtime = substream->runtime; 2974 void *bufs; 2975 snd_pcm_sframes_t result; 2976 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2977 return -EBADFD; 2978 if (runtime->channels > 128) 2979 return -EINVAL; 2980 if (put_user(0, &_xfern->result)) 2981 return -EFAULT; 2982 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2983 return -EFAULT; 2984 2985 bufs = memdup_user(xfern.bufs, 2986 sizeof(void *) * runtime->channels); 2987 if (IS_ERR(bufs)) 2988 return PTR_ERR(bufs); 2989 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2990 kfree(bufs); 2991 __put_user(result, &_xfern->result); 2992 return result < 0 ? result : 0; 2993 } 2994 case SNDRV_PCM_IOCTL_REWIND: 2995 { 2996 snd_pcm_uframes_t frames; 2997 snd_pcm_uframes_t __user *_frames = arg; 2998 snd_pcm_sframes_t result; 2999 if (get_user(frames, _frames)) 3000 return -EFAULT; 3001 if (put_user(0, _frames)) 3002 return -EFAULT; 3003 result = snd_pcm_capture_rewind(substream, frames); 3004 __put_user(result, _frames); 3005 return result < 0 ? result : 0; 3006 } 3007 case SNDRV_PCM_IOCTL_FORWARD: 3008 { 3009 snd_pcm_uframes_t frames; 3010 snd_pcm_uframes_t __user *_frames = arg; 3011 snd_pcm_sframes_t result; 3012 if (get_user(frames, _frames)) 3013 return -EFAULT; 3014 if (put_user(0, _frames)) 3015 return -EFAULT; 3016 result = snd_pcm_capture_forward(substream, frames); 3017 __put_user(result, _frames); 3018 return result < 0 ? result : 0; 3019 } 3020 } 3021 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 3022 } 3023 3024 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 3025 unsigned long arg) 3026 { 3027 struct snd_pcm_file *pcm_file; 3028 3029 pcm_file = file->private_data; 3030 3031 if (((cmd >> 8) & 0xff) != 'A') 3032 return -ENOTTY; 3033 3034 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 3035 (void __user *)arg); 3036 } 3037 3038 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 3039 unsigned long arg) 3040 { 3041 struct snd_pcm_file *pcm_file; 3042 3043 pcm_file = file->private_data; 3044 3045 if (((cmd >> 8) & 0xff) != 'A') 3046 return -ENOTTY; 3047 3048 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 3049 (void __user *)arg); 3050 } 3051 3052 /** 3053 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3054 * @substream: PCM substream 3055 * @cmd: IOCTL cmd 3056 * @arg: IOCTL argument 3057 * 3058 * The function is provided primarily for OSS layer and USB gadget drivers, 3059 * and it allows only the limited set of ioctls (hw_params, sw_params, 3060 * prepare, start, drain, drop, forward). 3061 */ 3062 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3063 unsigned int cmd, void *arg) 3064 { 3065 snd_pcm_uframes_t *frames = arg; 3066 snd_pcm_sframes_t result; 3067 3068 switch (cmd) { 3069 case SNDRV_PCM_IOCTL_FORWARD: 3070 { 3071 /* provided only for OSS; capture-only and no value returned */ 3072 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3073 return -EINVAL; 3074 result = snd_pcm_capture_forward(substream, *frames); 3075 return result < 0 ? result : 0; 3076 } 3077 case SNDRV_PCM_IOCTL_HW_PARAMS: 3078 return snd_pcm_hw_params(substream, arg); 3079 case SNDRV_PCM_IOCTL_SW_PARAMS: 3080 return snd_pcm_sw_params(substream, arg); 3081 case SNDRV_PCM_IOCTL_PREPARE: 3082 return snd_pcm_prepare(substream, NULL); 3083 case SNDRV_PCM_IOCTL_START: 3084 return snd_pcm_start_lock_irq(substream); 3085 case SNDRV_PCM_IOCTL_DRAIN: 3086 return snd_pcm_drain(substream, NULL); 3087 case SNDRV_PCM_IOCTL_DROP: 3088 return snd_pcm_drop(substream); 3089 case SNDRV_PCM_IOCTL_DELAY: 3090 { 3091 result = snd_pcm_delay(substream); 3092 if (result < 0) 3093 return result; 3094 *frames = result; 3095 return 0; 3096 } 3097 default: 3098 return -EINVAL; 3099 } 3100 } 3101 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3102 3103 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3104 loff_t * offset) 3105 { 3106 struct snd_pcm_file *pcm_file; 3107 struct snd_pcm_substream *substream; 3108 struct snd_pcm_runtime *runtime; 3109 snd_pcm_sframes_t result; 3110 3111 pcm_file = file->private_data; 3112 substream = pcm_file->substream; 3113 if (PCM_RUNTIME_CHECK(substream)) 3114 return -ENXIO; 3115 runtime = substream->runtime; 3116 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3117 return -EBADFD; 3118 if (!frame_aligned(runtime, count)) 3119 return -EINVAL; 3120 count = bytes_to_frames(runtime, count); 3121 result = snd_pcm_lib_read(substream, buf, count); 3122 if (result > 0) 3123 result = frames_to_bytes(runtime, result); 3124 return result; 3125 } 3126 3127 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3128 size_t count, loff_t * offset) 3129 { 3130 struct snd_pcm_file *pcm_file; 3131 struct snd_pcm_substream *substream; 3132 struct snd_pcm_runtime *runtime; 3133 snd_pcm_sframes_t result; 3134 3135 pcm_file = file->private_data; 3136 substream = pcm_file->substream; 3137 if (PCM_RUNTIME_CHECK(substream)) 3138 return -ENXIO; 3139 runtime = substream->runtime; 3140 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3141 return -EBADFD; 3142 if (!frame_aligned(runtime, count)) 3143 return -EINVAL; 3144 count = bytes_to_frames(runtime, count); 3145 result = snd_pcm_lib_write(substream, buf, count); 3146 if (result > 0) 3147 result = frames_to_bytes(runtime, result); 3148 return result; 3149 } 3150 3151 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3152 { 3153 struct snd_pcm_file *pcm_file; 3154 struct snd_pcm_substream *substream; 3155 struct snd_pcm_runtime *runtime; 3156 snd_pcm_sframes_t result; 3157 unsigned long i; 3158 void __user **bufs; 3159 snd_pcm_uframes_t frames; 3160 3161 pcm_file = iocb->ki_filp->private_data; 3162 substream = pcm_file->substream; 3163 if (PCM_RUNTIME_CHECK(substream)) 3164 return -ENXIO; 3165 runtime = substream->runtime; 3166 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3167 return -EBADFD; 3168 if (!iter_is_iovec(to)) 3169 return -EINVAL; 3170 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3171 return -EINVAL; 3172 if (!frame_aligned(runtime, to->iov->iov_len)) 3173 return -EINVAL; 3174 frames = bytes_to_samples(runtime, to->iov->iov_len); 3175 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3176 if (bufs == NULL) 3177 return -ENOMEM; 3178 for (i = 0; i < to->nr_segs; ++i) 3179 bufs[i] = to->iov[i].iov_base; 3180 result = snd_pcm_lib_readv(substream, bufs, frames); 3181 if (result > 0) 3182 result = frames_to_bytes(runtime, result); 3183 kfree(bufs); 3184 return result; 3185 } 3186 3187 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3188 { 3189 struct snd_pcm_file *pcm_file; 3190 struct snd_pcm_substream *substream; 3191 struct snd_pcm_runtime *runtime; 3192 snd_pcm_sframes_t result; 3193 unsigned long i; 3194 void __user **bufs; 3195 snd_pcm_uframes_t frames; 3196 3197 pcm_file = iocb->ki_filp->private_data; 3198 substream = pcm_file->substream; 3199 if (PCM_RUNTIME_CHECK(substream)) 3200 return -ENXIO; 3201 runtime = substream->runtime; 3202 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3203 return -EBADFD; 3204 if (!iter_is_iovec(from)) 3205 return -EINVAL; 3206 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3207 !frame_aligned(runtime, from->iov->iov_len)) 3208 return -EINVAL; 3209 frames = bytes_to_samples(runtime, from->iov->iov_len); 3210 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3211 if (bufs == NULL) 3212 return -ENOMEM; 3213 for (i = 0; i < from->nr_segs; ++i) 3214 bufs[i] = from->iov[i].iov_base; 3215 result = snd_pcm_lib_writev(substream, bufs, frames); 3216 if (result > 0) 3217 result = frames_to_bytes(runtime, result); 3218 kfree(bufs); 3219 return result; 3220 } 3221 3222 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3223 { 3224 struct snd_pcm_file *pcm_file; 3225 struct snd_pcm_substream *substream; 3226 struct snd_pcm_runtime *runtime; 3227 unsigned int mask; 3228 snd_pcm_uframes_t avail; 3229 3230 pcm_file = file->private_data; 3231 3232 substream = pcm_file->substream; 3233 if (PCM_RUNTIME_CHECK(substream)) 3234 return POLLOUT | POLLWRNORM | POLLERR; 3235 runtime = substream->runtime; 3236 3237 poll_wait(file, &runtime->sleep, wait); 3238 3239 snd_pcm_stream_lock_irq(substream); 3240 avail = snd_pcm_playback_avail(runtime); 3241 switch (runtime->status->state) { 3242 case SNDRV_PCM_STATE_RUNNING: 3243 case SNDRV_PCM_STATE_PREPARED: 3244 case SNDRV_PCM_STATE_PAUSED: 3245 if (avail >= runtime->control->avail_min) { 3246 mask = POLLOUT | POLLWRNORM; 3247 break; 3248 } 3249 /* Fall through */ 3250 case SNDRV_PCM_STATE_DRAINING: 3251 mask = 0; 3252 break; 3253 default: 3254 mask = POLLOUT | POLLWRNORM | POLLERR; 3255 break; 3256 } 3257 snd_pcm_stream_unlock_irq(substream); 3258 return mask; 3259 } 3260 3261 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3262 { 3263 struct snd_pcm_file *pcm_file; 3264 struct snd_pcm_substream *substream; 3265 struct snd_pcm_runtime *runtime; 3266 unsigned int mask; 3267 snd_pcm_uframes_t avail; 3268 3269 pcm_file = file->private_data; 3270 3271 substream = pcm_file->substream; 3272 if (PCM_RUNTIME_CHECK(substream)) 3273 return POLLIN | POLLRDNORM | POLLERR; 3274 runtime = substream->runtime; 3275 3276 poll_wait(file, &runtime->sleep, wait); 3277 3278 snd_pcm_stream_lock_irq(substream); 3279 avail = snd_pcm_capture_avail(runtime); 3280 switch (runtime->status->state) { 3281 case SNDRV_PCM_STATE_RUNNING: 3282 case SNDRV_PCM_STATE_PREPARED: 3283 case SNDRV_PCM_STATE_PAUSED: 3284 if (avail >= runtime->control->avail_min) { 3285 mask = POLLIN | POLLRDNORM; 3286 break; 3287 } 3288 mask = 0; 3289 break; 3290 case SNDRV_PCM_STATE_DRAINING: 3291 if (avail > 0) { 3292 mask = POLLIN | POLLRDNORM; 3293 break; 3294 } 3295 /* Fall through */ 3296 default: 3297 mask = POLLIN | POLLRDNORM | POLLERR; 3298 break; 3299 } 3300 snd_pcm_stream_unlock_irq(substream); 3301 return mask; 3302 } 3303 3304 /* 3305 * mmap support 3306 */ 3307 3308 /* 3309 * Only on coherent architectures, we can mmap the status and the control records 3310 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3311 */ 3312 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3313 /* 3314 * mmap status record 3315 */ 3316 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3317 { 3318 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3319 struct snd_pcm_runtime *runtime; 3320 3321 if (substream == NULL) 3322 return VM_FAULT_SIGBUS; 3323 runtime = substream->runtime; 3324 vmf->page = virt_to_page(runtime->status); 3325 get_page(vmf->page); 3326 return 0; 3327 } 3328 3329 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3330 { 3331 .fault = snd_pcm_mmap_status_fault, 3332 }; 3333 3334 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3335 struct vm_area_struct *area) 3336 { 3337 long size; 3338 if (!(area->vm_flags & VM_READ)) 3339 return -EINVAL; 3340 size = area->vm_end - area->vm_start; 3341 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3342 return -EINVAL; 3343 area->vm_ops = &snd_pcm_vm_ops_status; 3344 area->vm_private_data = substream; 3345 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3346 return 0; 3347 } 3348 3349 /* 3350 * mmap control record 3351 */ 3352 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3353 { 3354 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3355 struct snd_pcm_runtime *runtime; 3356 3357 if (substream == NULL) 3358 return VM_FAULT_SIGBUS; 3359 runtime = substream->runtime; 3360 vmf->page = virt_to_page(runtime->control); 3361 get_page(vmf->page); 3362 return 0; 3363 } 3364 3365 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3366 { 3367 .fault = snd_pcm_mmap_control_fault, 3368 }; 3369 3370 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3371 struct vm_area_struct *area) 3372 { 3373 long size; 3374 if (!(area->vm_flags & VM_READ)) 3375 return -EINVAL; 3376 size = area->vm_end - area->vm_start; 3377 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3378 return -EINVAL; 3379 area->vm_ops = &snd_pcm_vm_ops_control; 3380 area->vm_private_data = substream; 3381 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3382 return 0; 3383 } 3384 3385 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3386 { 3387 if (pcm_file->no_compat_mmap) 3388 return false; 3389 /* See pcm_control_mmap_allowed() below. 3390 * Since older alsa-lib requires both status and control mmaps to be 3391 * coupled, we have to disable the status mmap for old alsa-lib, too. 3392 */ 3393 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3394 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3395 return false; 3396 return true; 3397 } 3398 3399 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3400 { 3401 if (pcm_file->no_compat_mmap) 3402 return false; 3403 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3404 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3405 * thus it effectively assures the manual update of appl_ptr. 3406 */ 3407 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3408 return false; 3409 return true; 3410 } 3411 3412 #else /* ! coherent mmap */ 3413 /* 3414 * don't support mmap for status and control records. 3415 */ 3416 #define pcm_status_mmap_allowed(pcm_file) false 3417 #define pcm_control_mmap_allowed(pcm_file) false 3418 3419 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3420 struct vm_area_struct *area) 3421 { 3422 return -ENXIO; 3423 } 3424 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3425 struct vm_area_struct *area) 3426 { 3427 return -ENXIO; 3428 } 3429 #endif /* coherent mmap */ 3430 3431 static inline struct page * 3432 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3433 { 3434 void *vaddr = substream->runtime->dma_area + ofs; 3435 return virt_to_page(vaddr); 3436 } 3437 3438 /* 3439 * fault callback for mmapping a RAM page 3440 */ 3441 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3442 { 3443 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3444 struct snd_pcm_runtime *runtime; 3445 unsigned long offset; 3446 struct page * page; 3447 size_t dma_bytes; 3448 3449 if (substream == NULL) 3450 return VM_FAULT_SIGBUS; 3451 runtime = substream->runtime; 3452 offset = vmf->pgoff << PAGE_SHIFT; 3453 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3454 if (offset > dma_bytes - PAGE_SIZE) 3455 return VM_FAULT_SIGBUS; 3456 if (substream->ops->page) 3457 page = substream->ops->page(substream, offset); 3458 else 3459 page = snd_pcm_default_page_ops(substream, offset); 3460 if (!page) 3461 return VM_FAULT_SIGBUS; 3462 get_page(page); 3463 vmf->page = page; 3464 return 0; 3465 } 3466 3467 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3468 .open = snd_pcm_mmap_data_open, 3469 .close = snd_pcm_mmap_data_close, 3470 }; 3471 3472 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3473 .open = snd_pcm_mmap_data_open, 3474 .close = snd_pcm_mmap_data_close, 3475 .fault = snd_pcm_mmap_data_fault, 3476 }; 3477 3478 /* 3479 * mmap the DMA buffer on RAM 3480 */ 3481 3482 /** 3483 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3484 * @substream: PCM substream 3485 * @area: VMA 3486 * 3487 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3488 * this function is invoked implicitly. 3489 */ 3490 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3491 struct vm_area_struct *area) 3492 { 3493 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3494 #ifdef CONFIG_GENERIC_ALLOCATOR 3495 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3496 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3497 return remap_pfn_range(area, area->vm_start, 3498 substream->dma_buffer.addr >> PAGE_SHIFT, 3499 area->vm_end - area->vm_start, area->vm_page_prot); 3500 } 3501 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3502 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3503 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3504 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3505 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3506 area, 3507 substream->runtime->dma_area, 3508 substream->runtime->dma_addr, 3509 area->vm_end - area->vm_start); 3510 #endif /* CONFIG_X86 */ 3511 /* mmap with fault handler */ 3512 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3513 return 0; 3514 } 3515 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3516 3517 /* 3518 * mmap the DMA buffer on I/O memory area 3519 */ 3520 #if SNDRV_PCM_INFO_MMAP_IOMEM 3521 /** 3522 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3523 * @substream: PCM substream 3524 * @area: VMA 3525 * 3526 * When your hardware uses the iomapped pages as the hardware buffer and 3527 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3528 * is supposed to work only on limited architectures. 3529 */ 3530 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3531 struct vm_area_struct *area) 3532 { 3533 struct snd_pcm_runtime *runtime = substream->runtime;; 3534 3535 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3536 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3537 } 3538 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3539 #endif /* SNDRV_PCM_INFO_MMAP */ 3540 3541 /* 3542 * mmap DMA buffer 3543 */ 3544 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3545 struct vm_area_struct *area) 3546 { 3547 struct snd_pcm_runtime *runtime; 3548 long size; 3549 unsigned long offset; 3550 size_t dma_bytes; 3551 int err; 3552 3553 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3554 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3555 return -EINVAL; 3556 } else { 3557 if (!(area->vm_flags & VM_READ)) 3558 return -EINVAL; 3559 } 3560 runtime = substream->runtime; 3561 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3562 return -EBADFD; 3563 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3564 return -ENXIO; 3565 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3566 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3567 return -EINVAL; 3568 size = area->vm_end - area->vm_start; 3569 offset = area->vm_pgoff << PAGE_SHIFT; 3570 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3571 if ((size_t)size > dma_bytes) 3572 return -EINVAL; 3573 if (offset > dma_bytes - size) 3574 return -EINVAL; 3575 3576 area->vm_ops = &snd_pcm_vm_ops_data; 3577 area->vm_private_data = substream; 3578 if (substream->ops->mmap) 3579 err = substream->ops->mmap(substream, area); 3580 else 3581 err = snd_pcm_lib_default_mmap(substream, area); 3582 if (!err) 3583 atomic_inc(&substream->mmap_count); 3584 return err; 3585 } 3586 EXPORT_SYMBOL(snd_pcm_mmap_data); 3587 3588 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3589 { 3590 struct snd_pcm_file * pcm_file; 3591 struct snd_pcm_substream *substream; 3592 unsigned long offset; 3593 3594 pcm_file = file->private_data; 3595 substream = pcm_file->substream; 3596 if (PCM_RUNTIME_CHECK(substream)) 3597 return -ENXIO; 3598 3599 offset = area->vm_pgoff << PAGE_SHIFT; 3600 switch (offset) { 3601 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3602 if (!pcm_status_mmap_allowed(pcm_file)) 3603 return -ENXIO; 3604 return snd_pcm_mmap_status(substream, file, area); 3605 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3606 if (!pcm_control_mmap_allowed(pcm_file)) 3607 return -ENXIO; 3608 return snd_pcm_mmap_control(substream, file, area); 3609 default: 3610 return snd_pcm_mmap_data(substream, file, area); 3611 } 3612 return 0; 3613 } 3614 3615 static int snd_pcm_fasync(int fd, struct file * file, int on) 3616 { 3617 struct snd_pcm_file * pcm_file; 3618 struct snd_pcm_substream *substream; 3619 struct snd_pcm_runtime *runtime; 3620 3621 pcm_file = file->private_data; 3622 substream = pcm_file->substream; 3623 if (PCM_RUNTIME_CHECK(substream)) 3624 return -ENXIO; 3625 runtime = substream->runtime; 3626 return fasync_helper(fd, file, on, &runtime->fasync); 3627 } 3628 3629 /* 3630 * ioctl32 compat 3631 */ 3632 #ifdef CONFIG_COMPAT 3633 #include "pcm_compat.c" 3634 #else 3635 #define snd_pcm_ioctl_compat NULL 3636 #endif 3637 3638 /* 3639 * To be removed helpers to keep binary compatibility 3640 */ 3641 3642 #ifdef CONFIG_SND_SUPPORT_OLD_API 3643 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3644 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3645 3646 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3647 struct snd_pcm_hw_params_old *oparams) 3648 { 3649 unsigned int i; 3650 3651 memset(params, 0, sizeof(*params)); 3652 params->flags = oparams->flags; 3653 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3654 params->masks[i].bits[0] = oparams->masks[i]; 3655 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3656 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3657 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3658 params->info = oparams->info; 3659 params->msbits = oparams->msbits; 3660 params->rate_num = oparams->rate_num; 3661 params->rate_den = oparams->rate_den; 3662 params->fifo_size = oparams->fifo_size; 3663 } 3664 3665 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3666 struct snd_pcm_hw_params *params) 3667 { 3668 unsigned int i; 3669 3670 memset(oparams, 0, sizeof(*oparams)); 3671 oparams->flags = params->flags; 3672 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3673 oparams->masks[i] = params->masks[i].bits[0]; 3674 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3675 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3676 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3677 oparams->info = params->info; 3678 oparams->msbits = params->msbits; 3679 oparams->rate_num = params->rate_num; 3680 oparams->rate_den = params->rate_den; 3681 oparams->fifo_size = params->fifo_size; 3682 } 3683 3684 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3685 struct snd_pcm_hw_params_old __user * _oparams) 3686 { 3687 struct snd_pcm_hw_params *params; 3688 struct snd_pcm_hw_params_old *oparams = NULL; 3689 int err; 3690 3691 params = kmalloc(sizeof(*params), GFP_KERNEL); 3692 if (!params) 3693 return -ENOMEM; 3694 3695 oparams = memdup_user(_oparams, sizeof(*oparams)); 3696 if (IS_ERR(oparams)) { 3697 err = PTR_ERR(oparams); 3698 goto out; 3699 } 3700 snd_pcm_hw_convert_from_old_params(params, oparams); 3701 err = snd_pcm_hw_refine(substream, params); 3702 if (err < 0) 3703 goto out_old; 3704 3705 err = fixup_unreferenced_params(substream, params); 3706 if (err < 0) 3707 goto out_old; 3708 3709 snd_pcm_hw_convert_to_old_params(oparams, params); 3710 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3711 err = -EFAULT; 3712 out_old: 3713 kfree(oparams); 3714 out: 3715 kfree(params); 3716 return err; 3717 } 3718 3719 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3720 struct snd_pcm_hw_params_old __user * _oparams) 3721 { 3722 struct snd_pcm_hw_params *params; 3723 struct snd_pcm_hw_params_old *oparams = NULL; 3724 int err; 3725 3726 params = kmalloc(sizeof(*params), GFP_KERNEL); 3727 if (!params) 3728 return -ENOMEM; 3729 3730 oparams = memdup_user(_oparams, sizeof(*oparams)); 3731 if (IS_ERR(oparams)) { 3732 err = PTR_ERR(oparams); 3733 goto out; 3734 } 3735 3736 snd_pcm_hw_convert_from_old_params(params, oparams); 3737 err = snd_pcm_hw_params(substream, params); 3738 if (err < 0) 3739 goto out_old; 3740 3741 snd_pcm_hw_convert_to_old_params(oparams, params); 3742 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3743 err = -EFAULT; 3744 out_old: 3745 kfree(oparams); 3746 out: 3747 kfree(params); 3748 return err; 3749 } 3750 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3751 3752 #ifndef CONFIG_MMU 3753 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3754 unsigned long addr, 3755 unsigned long len, 3756 unsigned long pgoff, 3757 unsigned long flags) 3758 { 3759 struct snd_pcm_file *pcm_file = file->private_data; 3760 struct snd_pcm_substream *substream = pcm_file->substream; 3761 struct snd_pcm_runtime *runtime = substream->runtime; 3762 unsigned long offset = pgoff << PAGE_SHIFT; 3763 3764 switch (offset) { 3765 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3766 return (unsigned long)runtime->status; 3767 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3768 return (unsigned long)runtime->control; 3769 default: 3770 return (unsigned long)runtime->dma_area + offset; 3771 } 3772 } 3773 #else 3774 # define snd_pcm_get_unmapped_area NULL 3775 #endif 3776 3777 /* 3778 * Register section 3779 */ 3780 3781 const struct file_operations snd_pcm_f_ops[2] = { 3782 { 3783 .owner = THIS_MODULE, 3784 .write = snd_pcm_write, 3785 .write_iter = snd_pcm_writev, 3786 .open = snd_pcm_playback_open, 3787 .release = snd_pcm_release, 3788 .llseek = no_llseek, 3789 .poll = snd_pcm_playback_poll, 3790 .unlocked_ioctl = snd_pcm_playback_ioctl, 3791 .compat_ioctl = snd_pcm_ioctl_compat, 3792 .mmap = snd_pcm_mmap, 3793 .fasync = snd_pcm_fasync, 3794 .get_unmapped_area = snd_pcm_get_unmapped_area, 3795 }, 3796 { 3797 .owner = THIS_MODULE, 3798 .read = snd_pcm_read, 3799 .read_iter = snd_pcm_readv, 3800 .open = snd_pcm_capture_open, 3801 .release = snd_pcm_release, 3802 .llseek = no_llseek, 3803 .poll = snd_pcm_capture_poll, 3804 .unlocked_ioctl = snd_pcm_capture_ioctl, 3805 .compat_ioctl = snd_pcm_ioctl_compat, 3806 .mmap = snd_pcm_mmap, 3807 .fasync = snd_pcm_fasync, 3808 .get_unmapped_area = snd_pcm_get_unmapped_area, 3809 } 3810 }; 3811