1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/file.h> 25 #include <linux/slab.h> 26 #include <linux/sched/signal.h> 27 #include <linux/time.h> 28 #include <linux/pm_qos.h> 29 #include <linux/io.h> 30 #include <linux/dma-mapping.h> 31 #include <sound/core.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/pcm.h> 35 #include <sound/pcm_params.h> 36 #include <sound/timer.h> 37 #include <sound/minors.h> 38 #include <linux/uio.h> 39 40 #include "pcm_local.h" 41 42 #ifdef CONFIG_SND_DEBUG 43 #define CREATE_TRACE_POINTS 44 #include "pcm_param_trace.h" 45 #else 46 #define trace_hw_mask_param_enabled() 0 47 #define trace_hw_interval_param_enabled() 0 48 #define trace_hw_mask_param(substream, type, index, prev, curr) 49 #define trace_hw_interval_param(substream, type, index, prev, curr) 50 #endif 51 52 /* 53 * Compatibility 54 */ 55 56 struct snd_pcm_hw_params_old { 57 unsigned int flags; 58 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 59 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 60 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 61 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 62 unsigned int rmask; 63 unsigned int cmask; 64 unsigned int info; 65 unsigned int msbits; 66 unsigned int rate_num; 67 unsigned int rate_den; 68 snd_pcm_uframes_t fifo_size; 69 unsigned char reserved[64]; 70 }; 71 72 #ifdef CONFIG_SND_SUPPORT_OLD_API 73 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 74 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 75 76 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 77 struct snd_pcm_hw_params_old __user * _oparams); 78 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 79 struct snd_pcm_hw_params_old __user * _oparams); 80 #endif 81 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 82 83 /* 84 * 85 */ 86 87 static DEFINE_RWLOCK(snd_pcm_link_rwlock); 88 static DECLARE_RWSEM(snd_pcm_link_rwsem); 89 90 /* Writer in rwsem may block readers even during its waiting in queue, 91 * and this may lead to a deadlock when the code path takes read sem 92 * twice (e.g. one in snd_pcm_action_nonatomic() and another in 93 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to 94 * spin until it gets the lock. 95 */ 96 static inline void down_write_nonblock(struct rw_semaphore *lock) 97 { 98 while (!down_write_trylock(lock)) 99 cond_resched(); 100 } 101 102 /** 103 * snd_pcm_stream_lock - Lock the PCM stream 104 * @substream: PCM substream 105 * 106 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 107 * flag of the given substream. This also takes the global link rw lock 108 * (or rw sem), too, for avoiding the race with linked streams. 109 */ 110 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 111 { 112 if (substream->pcm->nonatomic) { 113 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING); 114 mutex_lock(&substream->self_group.mutex); 115 } else { 116 read_lock(&snd_pcm_link_rwlock); 117 spin_lock(&substream->self_group.lock); 118 } 119 } 120 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 121 122 /** 123 * snd_pcm_stream_lock - Unlock the PCM stream 124 * @substream: PCM substream 125 * 126 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 127 */ 128 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 129 { 130 if (substream->pcm->nonatomic) { 131 mutex_unlock(&substream->self_group.mutex); 132 up_read(&snd_pcm_link_rwsem); 133 } else { 134 spin_unlock(&substream->self_group.lock); 135 read_unlock(&snd_pcm_link_rwlock); 136 } 137 } 138 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 139 140 /** 141 * snd_pcm_stream_lock_irq - Lock the PCM stream 142 * @substream: PCM substream 143 * 144 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 145 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 146 * as snd_pcm_stream_lock(). 147 */ 148 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 149 { 150 if (!substream->pcm->nonatomic) 151 local_irq_disable(); 152 snd_pcm_stream_lock(substream); 153 } 154 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 155 156 /** 157 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 158 * @substream: PCM substream 159 * 160 * This is a counter-part of snd_pcm_stream_lock_irq(). 161 */ 162 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 163 { 164 snd_pcm_stream_unlock(substream); 165 if (!substream->pcm->nonatomic) 166 local_irq_enable(); 167 } 168 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 169 170 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 171 { 172 unsigned long flags = 0; 173 if (!substream->pcm->nonatomic) 174 local_irq_save(flags); 175 snd_pcm_stream_lock(substream); 176 return flags; 177 } 178 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 179 180 /** 181 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 182 * @substream: PCM substream 183 * @flags: irq flags 184 * 185 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 186 */ 187 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 188 unsigned long flags) 189 { 190 snd_pcm_stream_unlock(substream); 191 if (!substream->pcm->nonatomic) 192 local_irq_restore(flags); 193 } 194 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 195 196 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 197 { 198 struct snd_pcm_runtime *runtime; 199 struct snd_pcm *pcm = substream->pcm; 200 struct snd_pcm_str *pstr = substream->pstr; 201 202 memset(info, 0, sizeof(*info)); 203 info->card = pcm->card->number; 204 info->device = pcm->device; 205 info->stream = substream->stream; 206 info->subdevice = substream->number; 207 strlcpy(info->id, pcm->id, sizeof(info->id)); 208 strlcpy(info->name, pcm->name, sizeof(info->name)); 209 info->dev_class = pcm->dev_class; 210 info->dev_subclass = pcm->dev_subclass; 211 info->subdevices_count = pstr->substream_count; 212 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 213 strlcpy(info->subname, substream->name, sizeof(info->subname)); 214 runtime = substream->runtime; 215 /* AB: FIXME!!! This is definitely nonsense */ 216 if (runtime) { 217 info->sync = runtime->sync; 218 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info); 219 } 220 return 0; 221 } 222 223 int snd_pcm_info_user(struct snd_pcm_substream *substream, 224 struct snd_pcm_info __user * _info) 225 { 226 struct snd_pcm_info *info; 227 int err; 228 229 info = kmalloc(sizeof(*info), GFP_KERNEL); 230 if (! info) 231 return -ENOMEM; 232 err = snd_pcm_info(substream, info); 233 if (err >= 0) { 234 if (copy_to_user(_info, info, sizeof(*info))) 235 err = -EFAULT; 236 } 237 kfree(info); 238 return err; 239 } 240 241 static bool hw_support_mmap(struct snd_pcm_substream *substream) 242 { 243 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 244 return false; 245 /* check architectures that return -EINVAL from dma_mmap_coherent() */ 246 /* FIXME: this should be some global flag */ 247 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\ 248 defined(CONFIG_PARISC) || defined(CONFIG_XTENSA) 249 if (!substream->ops->mmap && 250 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 251 return false; 252 #endif 253 return true; 254 } 255 256 static int constrain_mask_params(struct snd_pcm_substream *substream, 257 struct snd_pcm_hw_params *params) 258 { 259 struct snd_pcm_hw_constraints *constrs = 260 &substream->runtime->hw_constraints; 261 struct snd_mask *m; 262 unsigned int k; 263 struct snd_mask old_mask; 264 int changed; 265 266 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 267 m = hw_param_mask(params, k); 268 if (snd_mask_empty(m)) 269 return -EINVAL; 270 271 /* This parameter is not requested to change by a caller. */ 272 if (!(params->rmask & (1 << k))) 273 continue; 274 275 if (trace_hw_mask_param_enabled()) 276 old_mask = *m; 277 278 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 279 280 trace_hw_mask_param(substream, k, 0, &old_mask, m); 281 282 /* Set corresponding flag so that the caller gets it. */ 283 if (changed) 284 params->cmask |= 1 << k; 285 if (changed < 0) 286 return changed; 287 } 288 289 return 0; 290 } 291 292 static int constrain_interval_params(struct snd_pcm_substream *substream, 293 struct snd_pcm_hw_params *params) 294 { 295 struct snd_pcm_hw_constraints *constrs = 296 &substream->runtime->hw_constraints; 297 struct snd_interval *i; 298 unsigned int k; 299 struct snd_interval old_interval; 300 int changed; 301 302 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 303 i = hw_param_interval(params, k); 304 if (snd_interval_empty(i)) 305 return -EINVAL; 306 307 /* This parameter is not requested to change by a caller. */ 308 if (!(params->rmask & (1 << k))) 309 continue; 310 311 if (trace_hw_interval_param_enabled()) 312 old_interval = *i; 313 314 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 315 316 trace_hw_interval_param(substream, k, 0, &old_interval, i); 317 318 /* Set corresponding flag so that the caller gets it. */ 319 if (changed) 320 params->cmask |= 1 << k; 321 if (changed < 0) 322 return changed; 323 } 324 325 return 0; 326 } 327 328 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 329 struct snd_pcm_hw_params *params) 330 { 331 struct snd_pcm_hw_constraints *constrs = 332 &substream->runtime->hw_constraints; 333 unsigned int k; 334 unsigned int rstamps[constrs->rules_num]; 335 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 336 unsigned int stamp; 337 struct snd_pcm_hw_rule *r; 338 unsigned int d; 339 struct snd_mask old_mask; 340 struct snd_interval old_interval; 341 bool again; 342 int changed; 343 344 /* 345 * Each application of rule has own sequence number. 346 * 347 * Each member of 'rstamps' array represents the sequence number of 348 * recent application of corresponding rule. 349 */ 350 for (k = 0; k < constrs->rules_num; k++) 351 rstamps[k] = 0; 352 353 /* 354 * Each member of 'vstamps' array represents the sequence number of 355 * recent application of rule in which corresponding parameters were 356 * changed. 357 * 358 * In initial state, elements corresponding to parameters requested by 359 * a caller is 1. For unrequested parameters, corresponding members 360 * have 0 so that the parameters are never changed anymore. 361 */ 362 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 363 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 364 365 /* Due to the above design, actual sequence number starts at 2. */ 366 stamp = 2; 367 retry: 368 /* Apply all rules in order. */ 369 again = false; 370 for (k = 0; k < constrs->rules_num; k++) { 371 r = &constrs->rules[k]; 372 373 /* 374 * Check condition bits of this rule. When the rule has 375 * some condition bits, parameter without the bits is 376 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 377 * is an example of the condition bits. 378 */ 379 if (r->cond && !(r->cond & params->flags)) 380 continue; 381 382 /* 383 * The 'deps' array includes maximum three dependencies 384 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 385 * member of this array is a sentinel and should be 386 * negative value. 387 * 388 * This rule should be processed in this time when dependent 389 * parameters were changed at former applications of the other 390 * rules. 391 */ 392 for (d = 0; r->deps[d] >= 0; d++) { 393 if (vstamps[r->deps[d]] > rstamps[k]) 394 break; 395 } 396 if (r->deps[d] < 0) 397 continue; 398 399 if (trace_hw_mask_param_enabled()) { 400 if (hw_is_mask(r->var)) 401 old_mask = *hw_param_mask(params, r->var); 402 } 403 if (trace_hw_interval_param_enabled()) { 404 if (hw_is_interval(r->var)) 405 old_interval = *hw_param_interval(params, r->var); 406 } 407 408 changed = r->func(params, r); 409 410 if (hw_is_mask(r->var)) { 411 trace_hw_mask_param(substream, r->var, k + 1, 412 &old_mask, hw_param_mask(params, r->var)); 413 } 414 if (hw_is_interval(r->var)) { 415 trace_hw_interval_param(substream, r->var, k + 1, 416 &old_interval, hw_param_interval(params, r->var)); 417 } 418 419 rstamps[k] = stamp; 420 421 /* 422 * When the parameters is changed, notify it to the caller 423 * by corresponding returned bit, then preparing for next 424 * iteration. 425 */ 426 if (changed && r->var >= 0) { 427 params->cmask |= (1 << r->var); 428 vstamps[r->var] = stamp; 429 again = true; 430 } 431 if (changed < 0) 432 return changed; 433 stamp++; 434 } 435 436 /* Iterate to evaluate all rules till no parameters are changed. */ 437 if (again) 438 goto retry; 439 440 return 0; 441 } 442 443 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 444 struct snd_pcm_hw_params *params) 445 { 446 const struct snd_interval *i; 447 const struct snd_mask *m; 448 int err; 449 450 if (!params->msbits) { 451 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 452 if (snd_interval_single(i)) 453 params->msbits = snd_interval_value(i); 454 } 455 456 if (!params->rate_den) { 457 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 458 if (snd_interval_single(i)) { 459 params->rate_num = snd_interval_value(i); 460 params->rate_den = 1; 461 } 462 } 463 464 if (!params->fifo_size) { 465 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 466 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 467 if (snd_mask_single(m) && snd_interval_single(i)) { 468 err = substream->ops->ioctl(substream, 469 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 470 if (err < 0) 471 return err; 472 } 473 } 474 475 if (!params->info) { 476 params->info = substream->runtime->hw.info; 477 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 478 SNDRV_PCM_INFO_DRAIN_TRIGGER); 479 if (!hw_support_mmap(substream)) 480 params->info &= ~(SNDRV_PCM_INFO_MMAP | 481 SNDRV_PCM_INFO_MMAP_VALID); 482 } 483 484 return 0; 485 } 486 487 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 488 struct snd_pcm_hw_params *params) 489 { 490 int err; 491 492 params->info = 0; 493 params->fifo_size = 0; 494 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 495 params->msbits = 0; 496 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 497 params->rate_num = 0; 498 params->rate_den = 0; 499 } 500 501 err = constrain_mask_params(substream, params); 502 if (err < 0) 503 return err; 504 505 err = constrain_interval_params(substream, params); 506 if (err < 0) 507 return err; 508 509 err = constrain_params_by_rules(substream, params); 510 if (err < 0) 511 return err; 512 513 params->rmask = 0; 514 515 return 0; 516 } 517 EXPORT_SYMBOL(snd_pcm_hw_refine); 518 519 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 520 struct snd_pcm_hw_params __user * _params) 521 { 522 struct snd_pcm_hw_params *params; 523 int err; 524 525 params = memdup_user(_params, sizeof(*params)); 526 if (IS_ERR(params)) 527 return PTR_ERR(params); 528 529 err = snd_pcm_hw_refine(substream, params); 530 if (err >= 0) 531 err = fixup_unreferenced_params(substream, params); 532 if (copy_to_user(_params, params, sizeof(*params))) { 533 if (!err) 534 err = -EFAULT; 535 } 536 537 kfree(params); 538 return err; 539 } 540 541 static int period_to_usecs(struct snd_pcm_runtime *runtime) 542 { 543 int usecs; 544 545 if (! runtime->rate) 546 return -1; /* invalid */ 547 548 /* take 75% of period time as the deadline */ 549 usecs = (750000 / runtime->rate) * runtime->period_size; 550 usecs += ((750000 % runtime->rate) * runtime->period_size) / 551 runtime->rate; 552 553 return usecs; 554 } 555 556 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 557 { 558 snd_pcm_stream_lock_irq(substream); 559 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 560 substream->runtime->status->state = state; 561 snd_pcm_stream_unlock_irq(substream); 562 } 563 564 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 565 int event) 566 { 567 #ifdef CONFIG_SND_PCM_TIMER 568 if (substream->timer) 569 snd_timer_notify(substream->timer, event, 570 &substream->runtime->trigger_tstamp); 571 #endif 572 } 573 574 /** 575 * snd_pcm_hw_param_choose - choose a configuration defined by @params 576 * @pcm: PCM instance 577 * @params: the hw_params instance 578 * 579 * Choose one configuration from configuration space defined by @params. 580 * The configuration chosen is that obtained fixing in this order: 581 * first access, first format, first subformat, min channels, 582 * min rate, min period time, max buffer size, min tick time 583 * 584 * Return: Zero if successful, or a negative error code on failure. 585 */ 586 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 587 struct snd_pcm_hw_params *params) 588 { 589 static const int vars[] = { 590 SNDRV_PCM_HW_PARAM_ACCESS, 591 SNDRV_PCM_HW_PARAM_FORMAT, 592 SNDRV_PCM_HW_PARAM_SUBFORMAT, 593 SNDRV_PCM_HW_PARAM_CHANNELS, 594 SNDRV_PCM_HW_PARAM_RATE, 595 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 596 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 597 SNDRV_PCM_HW_PARAM_TICK_TIME, 598 -1 599 }; 600 const int *v; 601 int err; 602 603 for (v = vars; *v != -1; v++) { 604 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 605 err = snd_pcm_hw_param_first(pcm, params, *v, NULL); 606 else 607 err = snd_pcm_hw_param_last(pcm, params, *v, NULL); 608 if (snd_BUG_ON(err < 0)) 609 return err; 610 } 611 return 0; 612 } 613 614 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 615 struct snd_pcm_hw_params *params) 616 { 617 struct snd_pcm_runtime *runtime; 618 int err, usecs; 619 unsigned int bits; 620 snd_pcm_uframes_t frames; 621 622 if (PCM_RUNTIME_CHECK(substream)) 623 return -ENXIO; 624 runtime = substream->runtime; 625 snd_pcm_stream_lock_irq(substream); 626 switch (runtime->status->state) { 627 case SNDRV_PCM_STATE_OPEN: 628 case SNDRV_PCM_STATE_SETUP: 629 case SNDRV_PCM_STATE_PREPARED: 630 break; 631 default: 632 snd_pcm_stream_unlock_irq(substream); 633 return -EBADFD; 634 } 635 snd_pcm_stream_unlock_irq(substream); 636 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 637 if (!substream->oss.oss) 638 #endif 639 if (atomic_read(&substream->mmap_count)) 640 return -EBADFD; 641 642 params->rmask = ~0U; 643 err = snd_pcm_hw_refine(substream, params); 644 if (err < 0) 645 goto _error; 646 647 err = snd_pcm_hw_params_choose(substream, params); 648 if (err < 0) 649 goto _error; 650 651 err = fixup_unreferenced_params(substream, params); 652 if (err < 0) 653 goto _error; 654 655 if (substream->ops->hw_params != NULL) { 656 err = substream->ops->hw_params(substream, params); 657 if (err < 0) 658 goto _error; 659 } 660 661 runtime->access = params_access(params); 662 runtime->format = params_format(params); 663 runtime->subformat = params_subformat(params); 664 runtime->channels = params_channels(params); 665 runtime->rate = params_rate(params); 666 runtime->period_size = params_period_size(params); 667 runtime->periods = params_periods(params); 668 runtime->buffer_size = params_buffer_size(params); 669 runtime->info = params->info; 670 runtime->rate_num = params->rate_num; 671 runtime->rate_den = params->rate_den; 672 runtime->no_period_wakeup = 673 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 674 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 675 676 bits = snd_pcm_format_physical_width(runtime->format); 677 runtime->sample_bits = bits; 678 bits *= runtime->channels; 679 runtime->frame_bits = bits; 680 frames = 1; 681 while (bits % 8 != 0) { 682 bits *= 2; 683 frames *= 2; 684 } 685 runtime->byte_align = bits / 8; 686 runtime->min_align = frames; 687 688 /* Default sw params */ 689 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 690 runtime->period_step = 1; 691 runtime->control->avail_min = runtime->period_size; 692 runtime->start_threshold = 1; 693 runtime->stop_threshold = runtime->buffer_size; 694 runtime->silence_threshold = 0; 695 runtime->silence_size = 0; 696 runtime->boundary = runtime->buffer_size; 697 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 698 runtime->boundary *= 2; 699 700 snd_pcm_timer_resolution_change(substream); 701 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 702 703 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 704 pm_qos_remove_request(&substream->latency_pm_qos_req); 705 if ((usecs = period_to_usecs(runtime)) >= 0) 706 pm_qos_add_request(&substream->latency_pm_qos_req, 707 PM_QOS_CPU_DMA_LATENCY, usecs); 708 return 0; 709 _error: 710 /* hardware might be unusable from this time, 711 so we force application to retry to set 712 the correct hardware parameter settings */ 713 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 714 if (substream->ops->hw_free != NULL) 715 substream->ops->hw_free(substream); 716 return err; 717 } 718 719 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 720 struct snd_pcm_hw_params __user * _params) 721 { 722 struct snd_pcm_hw_params *params; 723 int err; 724 725 params = memdup_user(_params, sizeof(*params)); 726 if (IS_ERR(params)) 727 return PTR_ERR(params); 728 729 err = snd_pcm_hw_params(substream, params); 730 if (copy_to_user(_params, params, sizeof(*params))) { 731 if (!err) 732 err = -EFAULT; 733 } 734 735 kfree(params); 736 return err; 737 } 738 739 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 740 { 741 struct snd_pcm_runtime *runtime; 742 int result = 0; 743 744 if (PCM_RUNTIME_CHECK(substream)) 745 return -ENXIO; 746 runtime = substream->runtime; 747 snd_pcm_stream_lock_irq(substream); 748 switch (runtime->status->state) { 749 case SNDRV_PCM_STATE_SETUP: 750 case SNDRV_PCM_STATE_PREPARED: 751 break; 752 default: 753 snd_pcm_stream_unlock_irq(substream); 754 return -EBADFD; 755 } 756 snd_pcm_stream_unlock_irq(substream); 757 if (atomic_read(&substream->mmap_count)) 758 return -EBADFD; 759 if (substream->ops->hw_free) 760 result = substream->ops->hw_free(substream); 761 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 762 pm_qos_remove_request(&substream->latency_pm_qos_req); 763 return result; 764 } 765 766 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 767 struct snd_pcm_sw_params *params) 768 { 769 struct snd_pcm_runtime *runtime; 770 int err; 771 772 if (PCM_RUNTIME_CHECK(substream)) 773 return -ENXIO; 774 runtime = substream->runtime; 775 snd_pcm_stream_lock_irq(substream); 776 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 777 snd_pcm_stream_unlock_irq(substream); 778 return -EBADFD; 779 } 780 snd_pcm_stream_unlock_irq(substream); 781 782 if (params->tstamp_mode < 0 || 783 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 784 return -EINVAL; 785 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 786 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 787 return -EINVAL; 788 if (params->avail_min == 0) 789 return -EINVAL; 790 if (params->silence_size >= runtime->boundary) { 791 if (params->silence_threshold != 0) 792 return -EINVAL; 793 } else { 794 if (params->silence_size > params->silence_threshold) 795 return -EINVAL; 796 if (params->silence_threshold > runtime->buffer_size) 797 return -EINVAL; 798 } 799 err = 0; 800 snd_pcm_stream_lock_irq(substream); 801 runtime->tstamp_mode = params->tstamp_mode; 802 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 803 runtime->tstamp_type = params->tstamp_type; 804 runtime->period_step = params->period_step; 805 runtime->control->avail_min = params->avail_min; 806 runtime->start_threshold = params->start_threshold; 807 runtime->stop_threshold = params->stop_threshold; 808 runtime->silence_threshold = params->silence_threshold; 809 runtime->silence_size = params->silence_size; 810 params->boundary = runtime->boundary; 811 if (snd_pcm_running(substream)) { 812 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 813 runtime->silence_size > 0) 814 snd_pcm_playback_silence(substream, ULONG_MAX); 815 err = snd_pcm_update_state(substream, runtime); 816 } 817 snd_pcm_stream_unlock_irq(substream); 818 return err; 819 } 820 821 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 822 struct snd_pcm_sw_params __user * _params) 823 { 824 struct snd_pcm_sw_params params; 825 int err; 826 if (copy_from_user(¶ms, _params, sizeof(params))) 827 return -EFAULT; 828 err = snd_pcm_sw_params(substream, ¶ms); 829 if (copy_to_user(_params, ¶ms, sizeof(params))) 830 return -EFAULT; 831 return err; 832 } 833 834 int snd_pcm_status(struct snd_pcm_substream *substream, 835 struct snd_pcm_status *status) 836 { 837 struct snd_pcm_runtime *runtime = substream->runtime; 838 839 snd_pcm_stream_lock_irq(substream); 840 841 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 842 &runtime->audio_tstamp_config); 843 844 /* backwards compatible behavior */ 845 if (runtime->audio_tstamp_config.type_requested == 846 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 847 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 848 runtime->audio_tstamp_config.type_requested = 849 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 850 else 851 runtime->audio_tstamp_config.type_requested = 852 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 853 runtime->audio_tstamp_report.valid = 0; 854 } else 855 runtime->audio_tstamp_report.valid = 1; 856 857 status->state = runtime->status->state; 858 status->suspended_state = runtime->status->suspended_state; 859 if (status->state == SNDRV_PCM_STATE_OPEN) 860 goto _end; 861 status->trigger_tstamp = runtime->trigger_tstamp; 862 if (snd_pcm_running(substream)) { 863 snd_pcm_update_hw_ptr(substream); 864 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 865 status->tstamp = runtime->status->tstamp; 866 status->driver_tstamp = runtime->driver_tstamp; 867 status->audio_tstamp = 868 runtime->status->audio_tstamp; 869 if (runtime->audio_tstamp_report.valid == 1) 870 /* backwards compatibility, no report provided in COMPAT mode */ 871 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 872 &status->audio_tstamp_accuracy, 873 &runtime->audio_tstamp_report); 874 875 goto _tstamp_end; 876 } 877 } else { 878 /* get tstamp only in fallback mode and only if enabled */ 879 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 880 snd_pcm_gettime(runtime, &status->tstamp); 881 } 882 _tstamp_end: 883 status->appl_ptr = runtime->control->appl_ptr; 884 status->hw_ptr = runtime->status->hw_ptr; 885 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 886 status->avail = snd_pcm_playback_avail(runtime); 887 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 888 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 889 status->delay = runtime->buffer_size - status->avail; 890 status->delay += runtime->delay; 891 } else 892 status->delay = 0; 893 } else { 894 status->avail = snd_pcm_capture_avail(runtime); 895 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 896 status->delay = status->avail + runtime->delay; 897 else 898 status->delay = 0; 899 } 900 status->avail_max = runtime->avail_max; 901 status->overrange = runtime->overrange; 902 runtime->avail_max = 0; 903 runtime->overrange = 0; 904 _end: 905 snd_pcm_stream_unlock_irq(substream); 906 return 0; 907 } 908 909 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 910 struct snd_pcm_status __user * _status, 911 bool ext) 912 { 913 struct snd_pcm_status status; 914 int res; 915 916 memset(&status, 0, sizeof(status)); 917 /* 918 * with extension, parameters are read/write, 919 * get audio_tstamp_data from user, 920 * ignore rest of status structure 921 */ 922 if (ext && get_user(status.audio_tstamp_data, 923 (u32 __user *)(&_status->audio_tstamp_data))) 924 return -EFAULT; 925 res = snd_pcm_status(substream, &status); 926 if (res < 0) 927 return res; 928 if (copy_to_user(_status, &status, sizeof(status))) 929 return -EFAULT; 930 return 0; 931 } 932 933 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 934 struct snd_pcm_channel_info * info) 935 { 936 struct snd_pcm_runtime *runtime; 937 unsigned int channel; 938 939 channel = info->channel; 940 runtime = substream->runtime; 941 snd_pcm_stream_lock_irq(substream); 942 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 943 snd_pcm_stream_unlock_irq(substream); 944 return -EBADFD; 945 } 946 snd_pcm_stream_unlock_irq(substream); 947 if (channel >= runtime->channels) 948 return -EINVAL; 949 memset(info, 0, sizeof(*info)); 950 info->channel = channel; 951 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 952 } 953 954 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 955 struct snd_pcm_channel_info __user * _info) 956 { 957 struct snd_pcm_channel_info info; 958 int res; 959 960 if (copy_from_user(&info, _info, sizeof(info))) 961 return -EFAULT; 962 res = snd_pcm_channel_info(substream, &info); 963 if (res < 0) 964 return res; 965 if (copy_to_user(_info, &info, sizeof(info))) 966 return -EFAULT; 967 return 0; 968 } 969 970 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 971 { 972 struct snd_pcm_runtime *runtime = substream->runtime; 973 if (runtime->trigger_master == NULL) 974 return; 975 if (runtime->trigger_master == substream) { 976 if (!runtime->trigger_tstamp_latched) 977 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 978 } else { 979 snd_pcm_trigger_tstamp(runtime->trigger_master); 980 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 981 } 982 runtime->trigger_master = NULL; 983 } 984 985 struct action_ops { 986 int (*pre_action)(struct snd_pcm_substream *substream, int state); 987 int (*do_action)(struct snd_pcm_substream *substream, int state); 988 void (*undo_action)(struct snd_pcm_substream *substream, int state); 989 void (*post_action)(struct snd_pcm_substream *substream, int state); 990 }; 991 992 /* 993 * this functions is core for handling of linked stream 994 * Note: the stream state might be changed also on failure 995 * Note2: call with calling stream lock + link lock 996 */ 997 static int snd_pcm_action_group(const struct action_ops *ops, 998 struct snd_pcm_substream *substream, 999 int state, int do_lock) 1000 { 1001 struct snd_pcm_substream *s = NULL; 1002 struct snd_pcm_substream *s1; 1003 int res = 0, depth = 1; 1004 1005 snd_pcm_group_for_each_entry(s, substream) { 1006 if (do_lock && s != substream) { 1007 if (s->pcm->nonatomic) 1008 mutex_lock_nested(&s->self_group.mutex, depth); 1009 else 1010 spin_lock_nested(&s->self_group.lock, depth); 1011 depth++; 1012 } 1013 res = ops->pre_action(s, state); 1014 if (res < 0) 1015 goto _unlock; 1016 } 1017 snd_pcm_group_for_each_entry(s, substream) { 1018 res = ops->do_action(s, state); 1019 if (res < 0) { 1020 if (ops->undo_action) { 1021 snd_pcm_group_for_each_entry(s1, substream) { 1022 if (s1 == s) /* failed stream */ 1023 break; 1024 ops->undo_action(s1, state); 1025 } 1026 } 1027 s = NULL; /* unlock all */ 1028 goto _unlock; 1029 } 1030 } 1031 snd_pcm_group_for_each_entry(s, substream) { 1032 ops->post_action(s, state); 1033 } 1034 _unlock: 1035 if (do_lock) { 1036 /* unlock streams */ 1037 snd_pcm_group_for_each_entry(s1, substream) { 1038 if (s1 != substream) { 1039 if (s1->pcm->nonatomic) 1040 mutex_unlock(&s1->self_group.mutex); 1041 else 1042 spin_unlock(&s1->self_group.lock); 1043 } 1044 if (s1 == s) /* end */ 1045 break; 1046 } 1047 } 1048 return res; 1049 } 1050 1051 /* 1052 * Note: call with stream lock 1053 */ 1054 static int snd_pcm_action_single(const struct action_ops *ops, 1055 struct snd_pcm_substream *substream, 1056 int state) 1057 { 1058 int res; 1059 1060 res = ops->pre_action(substream, state); 1061 if (res < 0) 1062 return res; 1063 res = ops->do_action(substream, state); 1064 if (res == 0) 1065 ops->post_action(substream, state); 1066 else if (ops->undo_action) 1067 ops->undo_action(substream, state); 1068 return res; 1069 } 1070 1071 /* 1072 * Note: call with stream lock 1073 */ 1074 static int snd_pcm_action(const struct action_ops *ops, 1075 struct snd_pcm_substream *substream, 1076 int state) 1077 { 1078 int res; 1079 1080 if (!snd_pcm_stream_linked(substream)) 1081 return snd_pcm_action_single(ops, substream, state); 1082 1083 if (substream->pcm->nonatomic) { 1084 if (!mutex_trylock(&substream->group->mutex)) { 1085 mutex_unlock(&substream->self_group.mutex); 1086 mutex_lock(&substream->group->mutex); 1087 mutex_lock(&substream->self_group.mutex); 1088 } 1089 res = snd_pcm_action_group(ops, substream, state, 1); 1090 mutex_unlock(&substream->group->mutex); 1091 } else { 1092 if (!spin_trylock(&substream->group->lock)) { 1093 spin_unlock(&substream->self_group.lock); 1094 spin_lock(&substream->group->lock); 1095 spin_lock(&substream->self_group.lock); 1096 } 1097 res = snd_pcm_action_group(ops, substream, state, 1); 1098 spin_unlock(&substream->group->lock); 1099 } 1100 return res; 1101 } 1102 1103 /* 1104 * Note: don't use any locks before 1105 */ 1106 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1107 struct snd_pcm_substream *substream, 1108 int state) 1109 { 1110 int res; 1111 1112 snd_pcm_stream_lock_irq(substream); 1113 res = snd_pcm_action(ops, substream, state); 1114 snd_pcm_stream_unlock_irq(substream); 1115 return res; 1116 } 1117 1118 /* 1119 */ 1120 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1121 struct snd_pcm_substream *substream, 1122 int state) 1123 { 1124 int res; 1125 1126 down_read(&snd_pcm_link_rwsem); 1127 if (snd_pcm_stream_linked(substream)) 1128 res = snd_pcm_action_group(ops, substream, state, 0); 1129 else 1130 res = snd_pcm_action_single(ops, substream, state); 1131 up_read(&snd_pcm_link_rwsem); 1132 return res; 1133 } 1134 1135 /* 1136 * start callbacks 1137 */ 1138 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1139 { 1140 struct snd_pcm_runtime *runtime = substream->runtime; 1141 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1142 return -EBADFD; 1143 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1144 !snd_pcm_playback_data(substream)) 1145 return -EPIPE; 1146 runtime->trigger_tstamp_latched = false; 1147 runtime->trigger_master = substream; 1148 return 0; 1149 } 1150 1151 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1152 { 1153 if (substream->runtime->trigger_master != substream) 1154 return 0; 1155 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1156 } 1157 1158 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1159 { 1160 if (substream->runtime->trigger_master == substream) 1161 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1162 } 1163 1164 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1165 { 1166 struct snd_pcm_runtime *runtime = substream->runtime; 1167 snd_pcm_trigger_tstamp(substream); 1168 runtime->hw_ptr_jiffies = jiffies; 1169 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1170 runtime->rate; 1171 runtime->status->state = state; 1172 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1173 runtime->silence_size > 0) 1174 snd_pcm_playback_silence(substream, ULONG_MAX); 1175 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1176 } 1177 1178 static const struct action_ops snd_pcm_action_start = { 1179 .pre_action = snd_pcm_pre_start, 1180 .do_action = snd_pcm_do_start, 1181 .undo_action = snd_pcm_undo_start, 1182 .post_action = snd_pcm_post_start 1183 }; 1184 1185 /** 1186 * snd_pcm_start - start all linked streams 1187 * @substream: the PCM substream instance 1188 * 1189 * Return: Zero if successful, or a negative error code. 1190 * The stream lock must be acquired before calling this function. 1191 */ 1192 int snd_pcm_start(struct snd_pcm_substream *substream) 1193 { 1194 return snd_pcm_action(&snd_pcm_action_start, substream, 1195 SNDRV_PCM_STATE_RUNNING); 1196 } 1197 1198 /* take the stream lock and start the streams */ 1199 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1200 { 1201 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1202 SNDRV_PCM_STATE_RUNNING); 1203 } 1204 1205 /* 1206 * stop callbacks 1207 */ 1208 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1209 { 1210 struct snd_pcm_runtime *runtime = substream->runtime; 1211 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1212 return -EBADFD; 1213 runtime->trigger_master = substream; 1214 return 0; 1215 } 1216 1217 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1218 { 1219 if (substream->runtime->trigger_master == substream && 1220 snd_pcm_running(substream)) 1221 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1222 return 0; /* unconditonally stop all substreams */ 1223 } 1224 1225 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1226 { 1227 struct snd_pcm_runtime *runtime = substream->runtime; 1228 if (runtime->status->state != state) { 1229 snd_pcm_trigger_tstamp(substream); 1230 runtime->status->state = state; 1231 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1232 } 1233 wake_up(&runtime->sleep); 1234 wake_up(&runtime->tsleep); 1235 } 1236 1237 static const struct action_ops snd_pcm_action_stop = { 1238 .pre_action = snd_pcm_pre_stop, 1239 .do_action = snd_pcm_do_stop, 1240 .post_action = snd_pcm_post_stop 1241 }; 1242 1243 /** 1244 * snd_pcm_stop - try to stop all running streams in the substream group 1245 * @substream: the PCM substream instance 1246 * @state: PCM state after stopping the stream 1247 * 1248 * The state of each stream is then changed to the given state unconditionally. 1249 * 1250 * Return: Zero if successful, or a negative error code. 1251 */ 1252 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1253 { 1254 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1255 } 1256 1257 EXPORT_SYMBOL(snd_pcm_stop); 1258 1259 /** 1260 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1261 * @substream: the PCM substream 1262 * 1263 * After stopping, the state is changed to SETUP. 1264 * Unlike snd_pcm_stop(), this affects only the given stream. 1265 * 1266 * Return: Zero if succesful, or a negative error code. 1267 */ 1268 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1269 { 1270 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1271 SNDRV_PCM_STATE_SETUP); 1272 } 1273 1274 /** 1275 * snd_pcm_stop_xrun - stop the running streams as XRUN 1276 * @substream: the PCM substream instance 1277 * 1278 * This stops the given running substream (and all linked substreams) as XRUN. 1279 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1280 * 1281 * Return: Zero if successful, or a negative error code. 1282 */ 1283 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1284 { 1285 unsigned long flags; 1286 int ret = 0; 1287 1288 snd_pcm_stream_lock_irqsave(substream, flags); 1289 if (snd_pcm_running(substream)) 1290 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1291 snd_pcm_stream_unlock_irqrestore(substream, flags); 1292 return ret; 1293 } 1294 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1295 1296 /* 1297 * pause callbacks 1298 */ 1299 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1300 { 1301 struct snd_pcm_runtime *runtime = substream->runtime; 1302 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1303 return -ENOSYS; 1304 if (push) { 1305 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1306 return -EBADFD; 1307 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1308 return -EBADFD; 1309 runtime->trigger_master = substream; 1310 return 0; 1311 } 1312 1313 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1314 { 1315 if (substream->runtime->trigger_master != substream) 1316 return 0; 1317 /* some drivers might use hw_ptr to recover from the pause - 1318 update the hw_ptr now */ 1319 if (push) 1320 snd_pcm_update_hw_ptr(substream); 1321 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1322 * a delta between the current jiffies, this gives a large enough 1323 * delta, effectively to skip the check once. 1324 */ 1325 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1326 return substream->ops->trigger(substream, 1327 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1328 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1329 } 1330 1331 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1332 { 1333 if (substream->runtime->trigger_master == substream) 1334 substream->ops->trigger(substream, 1335 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1336 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1337 } 1338 1339 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1340 { 1341 struct snd_pcm_runtime *runtime = substream->runtime; 1342 snd_pcm_trigger_tstamp(substream); 1343 if (push) { 1344 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1345 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1346 wake_up(&runtime->sleep); 1347 wake_up(&runtime->tsleep); 1348 } else { 1349 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1350 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1351 } 1352 } 1353 1354 static const struct action_ops snd_pcm_action_pause = { 1355 .pre_action = snd_pcm_pre_pause, 1356 .do_action = snd_pcm_do_pause, 1357 .undo_action = snd_pcm_undo_pause, 1358 .post_action = snd_pcm_post_pause 1359 }; 1360 1361 /* 1362 * Push/release the pause for all linked streams. 1363 */ 1364 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1365 { 1366 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1367 } 1368 1369 #ifdef CONFIG_PM 1370 /* suspend */ 1371 1372 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1373 { 1374 struct snd_pcm_runtime *runtime = substream->runtime; 1375 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1376 return -EBUSY; 1377 runtime->trigger_master = substream; 1378 return 0; 1379 } 1380 1381 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1382 { 1383 struct snd_pcm_runtime *runtime = substream->runtime; 1384 if (runtime->trigger_master != substream) 1385 return 0; 1386 if (! snd_pcm_running(substream)) 1387 return 0; 1388 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1389 return 0; /* suspend unconditionally */ 1390 } 1391 1392 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1393 { 1394 struct snd_pcm_runtime *runtime = substream->runtime; 1395 snd_pcm_trigger_tstamp(substream); 1396 runtime->status->suspended_state = runtime->status->state; 1397 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1398 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1399 wake_up(&runtime->sleep); 1400 wake_up(&runtime->tsleep); 1401 } 1402 1403 static const struct action_ops snd_pcm_action_suspend = { 1404 .pre_action = snd_pcm_pre_suspend, 1405 .do_action = snd_pcm_do_suspend, 1406 .post_action = snd_pcm_post_suspend 1407 }; 1408 1409 /** 1410 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1411 * @substream: the PCM substream 1412 * 1413 * After this call, all streams are changed to SUSPENDED state. 1414 * 1415 * Return: Zero if successful (or @substream is %NULL), or a negative error 1416 * code. 1417 */ 1418 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1419 { 1420 int err; 1421 unsigned long flags; 1422 1423 if (! substream) 1424 return 0; 1425 1426 snd_pcm_stream_lock_irqsave(substream, flags); 1427 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1428 snd_pcm_stream_unlock_irqrestore(substream, flags); 1429 return err; 1430 } 1431 1432 EXPORT_SYMBOL(snd_pcm_suspend); 1433 1434 /** 1435 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1436 * @pcm: the PCM instance 1437 * 1438 * After this call, all streams are changed to SUSPENDED state. 1439 * 1440 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1441 */ 1442 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1443 { 1444 struct snd_pcm_substream *substream; 1445 int stream, err = 0; 1446 1447 if (! pcm) 1448 return 0; 1449 1450 for (stream = 0; stream < 2; stream++) { 1451 for (substream = pcm->streams[stream].substream; 1452 substream; substream = substream->next) { 1453 /* FIXME: the open/close code should lock this as well */ 1454 if (substream->runtime == NULL) 1455 continue; 1456 err = snd_pcm_suspend(substream); 1457 if (err < 0 && err != -EBUSY) 1458 return err; 1459 } 1460 } 1461 return 0; 1462 } 1463 1464 EXPORT_SYMBOL(snd_pcm_suspend_all); 1465 1466 /* resume */ 1467 1468 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1469 { 1470 struct snd_pcm_runtime *runtime = substream->runtime; 1471 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1472 return -ENOSYS; 1473 runtime->trigger_master = substream; 1474 return 0; 1475 } 1476 1477 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1478 { 1479 struct snd_pcm_runtime *runtime = substream->runtime; 1480 if (runtime->trigger_master != substream) 1481 return 0; 1482 /* DMA not running previously? */ 1483 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1484 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1485 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1486 return 0; 1487 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1488 } 1489 1490 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1491 { 1492 if (substream->runtime->trigger_master == substream && 1493 snd_pcm_running(substream)) 1494 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1495 } 1496 1497 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1498 { 1499 struct snd_pcm_runtime *runtime = substream->runtime; 1500 snd_pcm_trigger_tstamp(substream); 1501 runtime->status->state = runtime->status->suspended_state; 1502 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1503 } 1504 1505 static const struct action_ops snd_pcm_action_resume = { 1506 .pre_action = snd_pcm_pre_resume, 1507 .do_action = snd_pcm_do_resume, 1508 .undo_action = snd_pcm_undo_resume, 1509 .post_action = snd_pcm_post_resume 1510 }; 1511 1512 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1513 { 1514 struct snd_card *card = substream->pcm->card; 1515 int res; 1516 1517 snd_power_lock(card); 1518 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1519 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1520 snd_power_unlock(card); 1521 return res; 1522 } 1523 1524 #else 1525 1526 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1527 { 1528 return -ENOSYS; 1529 } 1530 1531 #endif /* CONFIG_PM */ 1532 1533 /* 1534 * xrun ioctl 1535 * 1536 * Change the RUNNING stream(s) to XRUN state. 1537 */ 1538 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1539 { 1540 struct snd_card *card = substream->pcm->card; 1541 struct snd_pcm_runtime *runtime = substream->runtime; 1542 int result; 1543 1544 snd_power_lock(card); 1545 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1546 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1547 if (result < 0) 1548 goto _unlock; 1549 } 1550 1551 snd_pcm_stream_lock_irq(substream); 1552 switch (runtime->status->state) { 1553 case SNDRV_PCM_STATE_XRUN: 1554 result = 0; /* already there */ 1555 break; 1556 case SNDRV_PCM_STATE_RUNNING: 1557 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1558 break; 1559 default: 1560 result = -EBADFD; 1561 } 1562 snd_pcm_stream_unlock_irq(substream); 1563 _unlock: 1564 snd_power_unlock(card); 1565 return result; 1566 } 1567 1568 /* 1569 * reset ioctl 1570 */ 1571 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1572 { 1573 struct snd_pcm_runtime *runtime = substream->runtime; 1574 switch (runtime->status->state) { 1575 case SNDRV_PCM_STATE_RUNNING: 1576 case SNDRV_PCM_STATE_PREPARED: 1577 case SNDRV_PCM_STATE_PAUSED: 1578 case SNDRV_PCM_STATE_SUSPENDED: 1579 return 0; 1580 default: 1581 return -EBADFD; 1582 } 1583 } 1584 1585 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1586 { 1587 struct snd_pcm_runtime *runtime = substream->runtime; 1588 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1589 if (err < 0) 1590 return err; 1591 runtime->hw_ptr_base = 0; 1592 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1593 runtime->status->hw_ptr % runtime->period_size; 1594 runtime->silence_start = runtime->status->hw_ptr; 1595 runtime->silence_filled = 0; 1596 return 0; 1597 } 1598 1599 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1600 { 1601 struct snd_pcm_runtime *runtime = substream->runtime; 1602 runtime->control->appl_ptr = runtime->status->hw_ptr; 1603 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1604 runtime->silence_size > 0) 1605 snd_pcm_playback_silence(substream, ULONG_MAX); 1606 } 1607 1608 static const struct action_ops snd_pcm_action_reset = { 1609 .pre_action = snd_pcm_pre_reset, 1610 .do_action = snd_pcm_do_reset, 1611 .post_action = snd_pcm_post_reset 1612 }; 1613 1614 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1615 { 1616 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1617 } 1618 1619 /* 1620 * prepare ioctl 1621 */ 1622 /* we use the second argument for updating f_flags */ 1623 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1624 int f_flags) 1625 { 1626 struct snd_pcm_runtime *runtime = substream->runtime; 1627 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1628 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1629 return -EBADFD; 1630 if (snd_pcm_running(substream)) 1631 return -EBUSY; 1632 substream->f_flags = f_flags; 1633 return 0; 1634 } 1635 1636 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1637 { 1638 int err; 1639 err = substream->ops->prepare(substream); 1640 if (err < 0) 1641 return err; 1642 return snd_pcm_do_reset(substream, 0); 1643 } 1644 1645 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1646 { 1647 struct snd_pcm_runtime *runtime = substream->runtime; 1648 runtime->control->appl_ptr = runtime->status->hw_ptr; 1649 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1650 } 1651 1652 static const struct action_ops snd_pcm_action_prepare = { 1653 .pre_action = snd_pcm_pre_prepare, 1654 .do_action = snd_pcm_do_prepare, 1655 .post_action = snd_pcm_post_prepare 1656 }; 1657 1658 /** 1659 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1660 * @substream: the PCM substream instance 1661 * @file: file to refer f_flags 1662 * 1663 * Return: Zero if successful, or a negative error code. 1664 */ 1665 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1666 struct file *file) 1667 { 1668 int res; 1669 struct snd_card *card = substream->pcm->card; 1670 int f_flags; 1671 1672 if (file) 1673 f_flags = file->f_flags; 1674 else 1675 f_flags = substream->f_flags; 1676 1677 snd_power_lock(card); 1678 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1679 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1680 substream, f_flags); 1681 snd_power_unlock(card); 1682 return res; 1683 } 1684 1685 /* 1686 * drain ioctl 1687 */ 1688 1689 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1690 { 1691 struct snd_pcm_runtime *runtime = substream->runtime; 1692 switch (runtime->status->state) { 1693 case SNDRV_PCM_STATE_OPEN: 1694 case SNDRV_PCM_STATE_DISCONNECTED: 1695 case SNDRV_PCM_STATE_SUSPENDED: 1696 return -EBADFD; 1697 } 1698 runtime->trigger_master = substream; 1699 return 0; 1700 } 1701 1702 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1703 { 1704 struct snd_pcm_runtime *runtime = substream->runtime; 1705 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1706 switch (runtime->status->state) { 1707 case SNDRV_PCM_STATE_PREPARED: 1708 /* start playback stream if possible */ 1709 if (! snd_pcm_playback_empty(substream)) { 1710 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1711 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1712 } else { 1713 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1714 } 1715 break; 1716 case SNDRV_PCM_STATE_RUNNING: 1717 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1718 break; 1719 case SNDRV_PCM_STATE_XRUN: 1720 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1721 break; 1722 default: 1723 break; 1724 } 1725 } else { 1726 /* stop running stream */ 1727 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1728 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1729 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1730 snd_pcm_do_stop(substream, new_state); 1731 snd_pcm_post_stop(substream, new_state); 1732 } 1733 } 1734 1735 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1736 runtime->trigger_master == substream && 1737 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1738 return substream->ops->trigger(substream, 1739 SNDRV_PCM_TRIGGER_DRAIN); 1740 1741 return 0; 1742 } 1743 1744 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1745 { 1746 } 1747 1748 static const struct action_ops snd_pcm_action_drain_init = { 1749 .pre_action = snd_pcm_pre_drain_init, 1750 .do_action = snd_pcm_do_drain_init, 1751 .post_action = snd_pcm_post_drain_init 1752 }; 1753 1754 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1755 1756 /* 1757 * Drain the stream(s). 1758 * When the substream is linked, sync until the draining of all playback streams 1759 * is finished. 1760 * After this call, all streams are supposed to be either SETUP or DRAINING 1761 * (capture only) state. 1762 */ 1763 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1764 struct file *file) 1765 { 1766 struct snd_card *card; 1767 struct snd_pcm_runtime *runtime; 1768 struct snd_pcm_substream *s; 1769 wait_queue_t wait; 1770 int result = 0; 1771 int nonblock = 0; 1772 1773 card = substream->pcm->card; 1774 runtime = substream->runtime; 1775 1776 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1777 return -EBADFD; 1778 1779 snd_power_lock(card); 1780 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1781 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1782 if (result < 0) { 1783 snd_power_unlock(card); 1784 return result; 1785 } 1786 } 1787 1788 if (file) { 1789 if (file->f_flags & O_NONBLOCK) 1790 nonblock = 1; 1791 } else if (substream->f_flags & O_NONBLOCK) 1792 nonblock = 1; 1793 1794 down_read(&snd_pcm_link_rwsem); 1795 snd_pcm_stream_lock_irq(substream); 1796 /* resume pause */ 1797 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1798 snd_pcm_pause(substream, 0); 1799 1800 /* pre-start/stop - all running streams are changed to DRAINING state */ 1801 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1802 if (result < 0) 1803 goto unlock; 1804 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1805 if (nonblock) { 1806 result = -EAGAIN; 1807 goto unlock; 1808 } 1809 1810 for (;;) { 1811 long tout; 1812 struct snd_pcm_runtime *to_check; 1813 if (signal_pending(current)) { 1814 result = -ERESTARTSYS; 1815 break; 1816 } 1817 /* find a substream to drain */ 1818 to_check = NULL; 1819 snd_pcm_group_for_each_entry(s, substream) { 1820 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1821 continue; 1822 runtime = s->runtime; 1823 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1824 to_check = runtime; 1825 break; 1826 } 1827 } 1828 if (!to_check) 1829 break; /* all drained */ 1830 init_waitqueue_entry(&wait, current); 1831 add_wait_queue(&to_check->sleep, &wait); 1832 snd_pcm_stream_unlock_irq(substream); 1833 up_read(&snd_pcm_link_rwsem); 1834 snd_power_unlock(card); 1835 if (runtime->no_period_wakeup) 1836 tout = MAX_SCHEDULE_TIMEOUT; 1837 else { 1838 tout = 10; 1839 if (runtime->rate) { 1840 long t = runtime->period_size * 2 / runtime->rate; 1841 tout = max(t, tout); 1842 } 1843 tout = msecs_to_jiffies(tout * 1000); 1844 } 1845 tout = schedule_timeout_interruptible(tout); 1846 snd_power_lock(card); 1847 down_read(&snd_pcm_link_rwsem); 1848 snd_pcm_stream_lock_irq(substream); 1849 remove_wait_queue(&to_check->sleep, &wait); 1850 if (card->shutdown) { 1851 result = -ENODEV; 1852 break; 1853 } 1854 if (tout == 0) { 1855 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1856 result = -ESTRPIPE; 1857 else { 1858 dev_dbg(substream->pcm->card->dev, 1859 "playback drain error (DMA or IRQ trouble?)\n"); 1860 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1861 result = -EIO; 1862 } 1863 break; 1864 } 1865 } 1866 1867 unlock: 1868 snd_pcm_stream_unlock_irq(substream); 1869 up_read(&snd_pcm_link_rwsem); 1870 snd_power_unlock(card); 1871 1872 return result; 1873 } 1874 1875 /* 1876 * drop ioctl 1877 * 1878 * Immediately put all linked substreams into SETUP state. 1879 */ 1880 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1881 { 1882 struct snd_pcm_runtime *runtime; 1883 int result = 0; 1884 1885 if (PCM_RUNTIME_CHECK(substream)) 1886 return -ENXIO; 1887 runtime = substream->runtime; 1888 1889 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1890 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1891 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1892 return -EBADFD; 1893 1894 snd_pcm_stream_lock_irq(substream); 1895 /* resume pause */ 1896 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1897 snd_pcm_pause(substream, 0); 1898 1899 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1900 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1901 snd_pcm_stream_unlock_irq(substream); 1902 1903 return result; 1904 } 1905 1906 1907 static bool is_pcm_file(struct file *file) 1908 { 1909 struct inode *inode = file_inode(file); 1910 unsigned int minor; 1911 1912 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1913 return false; 1914 minor = iminor(inode); 1915 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1916 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1917 } 1918 1919 /* 1920 * PCM link handling 1921 */ 1922 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1923 { 1924 int res = 0; 1925 struct snd_pcm_file *pcm_file; 1926 struct snd_pcm_substream *substream1; 1927 struct snd_pcm_group *group; 1928 struct fd f = fdget(fd); 1929 1930 if (!f.file) 1931 return -EBADFD; 1932 if (!is_pcm_file(f.file)) { 1933 res = -EBADFD; 1934 goto _badf; 1935 } 1936 pcm_file = f.file->private_data; 1937 substream1 = pcm_file->substream; 1938 group = kmalloc(sizeof(*group), GFP_KERNEL); 1939 if (!group) { 1940 res = -ENOMEM; 1941 goto _nolock; 1942 } 1943 down_write_nonblock(&snd_pcm_link_rwsem); 1944 write_lock_irq(&snd_pcm_link_rwlock); 1945 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1946 substream->runtime->status->state != substream1->runtime->status->state || 1947 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1948 res = -EBADFD; 1949 goto _end; 1950 } 1951 if (snd_pcm_stream_linked(substream1)) { 1952 res = -EALREADY; 1953 goto _end; 1954 } 1955 if (!snd_pcm_stream_linked(substream)) { 1956 substream->group = group; 1957 group = NULL; 1958 spin_lock_init(&substream->group->lock); 1959 mutex_init(&substream->group->mutex); 1960 INIT_LIST_HEAD(&substream->group->substreams); 1961 list_add_tail(&substream->link_list, &substream->group->substreams); 1962 substream->group->count = 1; 1963 } 1964 list_add_tail(&substream1->link_list, &substream->group->substreams); 1965 substream->group->count++; 1966 substream1->group = substream->group; 1967 _end: 1968 write_unlock_irq(&snd_pcm_link_rwlock); 1969 up_write(&snd_pcm_link_rwsem); 1970 _nolock: 1971 snd_card_unref(substream1->pcm->card); 1972 kfree(group); 1973 _badf: 1974 fdput(f); 1975 return res; 1976 } 1977 1978 static void relink_to_local(struct snd_pcm_substream *substream) 1979 { 1980 substream->group = &substream->self_group; 1981 INIT_LIST_HEAD(&substream->self_group.substreams); 1982 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1983 } 1984 1985 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1986 { 1987 struct snd_pcm_substream *s; 1988 int res = 0; 1989 1990 down_write_nonblock(&snd_pcm_link_rwsem); 1991 write_lock_irq(&snd_pcm_link_rwlock); 1992 if (!snd_pcm_stream_linked(substream)) { 1993 res = -EALREADY; 1994 goto _end; 1995 } 1996 list_del(&substream->link_list); 1997 substream->group->count--; 1998 if (substream->group->count == 1) { /* detach the last stream, too */ 1999 snd_pcm_group_for_each_entry(s, substream) { 2000 relink_to_local(s); 2001 break; 2002 } 2003 kfree(substream->group); 2004 } 2005 relink_to_local(substream); 2006 _end: 2007 write_unlock_irq(&snd_pcm_link_rwlock); 2008 up_write(&snd_pcm_link_rwsem); 2009 return res; 2010 } 2011 2012 /* 2013 * hw configurator 2014 */ 2015 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2016 struct snd_pcm_hw_rule *rule) 2017 { 2018 struct snd_interval t; 2019 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2020 hw_param_interval_c(params, rule->deps[1]), &t); 2021 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2022 } 2023 2024 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2025 struct snd_pcm_hw_rule *rule) 2026 { 2027 struct snd_interval t; 2028 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2029 hw_param_interval_c(params, rule->deps[1]), &t); 2030 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2031 } 2032 2033 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2034 struct snd_pcm_hw_rule *rule) 2035 { 2036 struct snd_interval t; 2037 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2038 hw_param_interval_c(params, rule->deps[1]), 2039 (unsigned long) rule->private, &t); 2040 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2041 } 2042 2043 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2044 struct snd_pcm_hw_rule *rule) 2045 { 2046 struct snd_interval t; 2047 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2048 (unsigned long) rule->private, 2049 hw_param_interval_c(params, rule->deps[1]), &t); 2050 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2051 } 2052 2053 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2054 struct snd_pcm_hw_rule *rule) 2055 { 2056 unsigned int k; 2057 const struct snd_interval *i = 2058 hw_param_interval_c(params, rule->deps[0]); 2059 struct snd_mask m; 2060 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2061 snd_mask_any(&m); 2062 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2063 int bits; 2064 if (! snd_mask_test(mask, k)) 2065 continue; 2066 bits = snd_pcm_format_physical_width(k); 2067 if (bits <= 0) 2068 continue; /* ignore invalid formats */ 2069 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2070 snd_mask_reset(&m, k); 2071 } 2072 return snd_mask_refine(mask, &m); 2073 } 2074 2075 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2076 struct snd_pcm_hw_rule *rule) 2077 { 2078 struct snd_interval t; 2079 unsigned int k; 2080 t.min = UINT_MAX; 2081 t.max = 0; 2082 t.openmin = 0; 2083 t.openmax = 0; 2084 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2085 int bits; 2086 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2087 continue; 2088 bits = snd_pcm_format_physical_width(k); 2089 if (bits <= 0) 2090 continue; /* ignore invalid formats */ 2091 if (t.min > (unsigned)bits) 2092 t.min = bits; 2093 if (t.max < (unsigned)bits) 2094 t.max = bits; 2095 } 2096 t.integer = 1; 2097 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2098 } 2099 2100 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2101 #error "Change this table" 2102 #endif 2103 2104 static const unsigned int rates[] = { 2105 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2106 48000, 64000, 88200, 96000, 176400, 192000 2107 }; 2108 2109 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2110 .count = ARRAY_SIZE(rates), 2111 .list = rates, 2112 }; 2113 2114 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2115 struct snd_pcm_hw_rule *rule) 2116 { 2117 struct snd_pcm_hardware *hw = rule->private; 2118 return snd_interval_list(hw_param_interval(params, rule->var), 2119 snd_pcm_known_rates.count, 2120 snd_pcm_known_rates.list, hw->rates); 2121 } 2122 2123 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2124 struct snd_pcm_hw_rule *rule) 2125 { 2126 struct snd_interval t; 2127 struct snd_pcm_substream *substream = rule->private; 2128 t.min = 0; 2129 t.max = substream->buffer_bytes_max; 2130 t.openmin = 0; 2131 t.openmax = 0; 2132 t.integer = 1; 2133 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2134 } 2135 2136 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2137 { 2138 struct snd_pcm_runtime *runtime = substream->runtime; 2139 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2140 int k, err; 2141 2142 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2143 snd_mask_any(constrs_mask(constrs, k)); 2144 } 2145 2146 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2147 snd_interval_any(constrs_interval(constrs, k)); 2148 } 2149 2150 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2151 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2152 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2153 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2154 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2155 2156 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2157 snd_pcm_hw_rule_format, NULL, 2158 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2159 if (err < 0) 2160 return err; 2161 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2162 snd_pcm_hw_rule_sample_bits, NULL, 2163 SNDRV_PCM_HW_PARAM_FORMAT, 2164 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2165 if (err < 0) 2166 return err; 2167 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2168 snd_pcm_hw_rule_div, NULL, 2169 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2170 if (err < 0) 2171 return err; 2172 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2173 snd_pcm_hw_rule_mul, NULL, 2174 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2175 if (err < 0) 2176 return err; 2177 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2178 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2179 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2180 if (err < 0) 2181 return err; 2182 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2183 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2184 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2185 if (err < 0) 2186 return err; 2187 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2188 snd_pcm_hw_rule_div, NULL, 2189 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2190 if (err < 0) 2191 return err; 2192 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2193 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2194 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2195 if (err < 0) 2196 return err; 2197 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2198 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2199 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2200 if (err < 0) 2201 return err; 2202 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2203 snd_pcm_hw_rule_div, NULL, 2204 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2205 if (err < 0) 2206 return err; 2207 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2208 snd_pcm_hw_rule_div, NULL, 2209 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2210 if (err < 0) 2211 return err; 2212 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2213 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2214 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2215 if (err < 0) 2216 return err; 2217 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2218 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2219 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2220 if (err < 0) 2221 return err; 2222 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2223 snd_pcm_hw_rule_mul, NULL, 2224 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2225 if (err < 0) 2226 return err; 2227 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2228 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2229 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2230 if (err < 0) 2231 return err; 2232 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2233 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2234 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2235 if (err < 0) 2236 return err; 2237 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2238 snd_pcm_hw_rule_muldivk, (void*) 8, 2239 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2240 if (err < 0) 2241 return err; 2242 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2243 snd_pcm_hw_rule_muldivk, (void*) 8, 2244 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2245 if (err < 0) 2246 return err; 2247 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2248 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2249 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2250 if (err < 0) 2251 return err; 2252 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2253 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2254 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2255 if (err < 0) 2256 return err; 2257 return 0; 2258 } 2259 2260 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2261 { 2262 struct snd_pcm_runtime *runtime = substream->runtime; 2263 struct snd_pcm_hardware *hw = &runtime->hw; 2264 int err; 2265 unsigned int mask = 0; 2266 2267 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2268 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2269 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2270 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2271 if (hw_support_mmap(substream)) { 2272 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2273 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2274 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2275 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2276 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2277 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2278 } 2279 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2280 if (err < 0) 2281 return err; 2282 2283 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2284 if (err < 0) 2285 return err; 2286 2287 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2288 if (err < 0) 2289 return err; 2290 2291 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2292 hw->channels_min, hw->channels_max); 2293 if (err < 0) 2294 return err; 2295 2296 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2297 hw->rate_min, hw->rate_max); 2298 if (err < 0) 2299 return err; 2300 2301 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2302 hw->period_bytes_min, hw->period_bytes_max); 2303 if (err < 0) 2304 return err; 2305 2306 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2307 hw->periods_min, hw->periods_max); 2308 if (err < 0) 2309 return err; 2310 2311 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2312 hw->period_bytes_min, hw->buffer_bytes_max); 2313 if (err < 0) 2314 return err; 2315 2316 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2317 snd_pcm_hw_rule_buffer_bytes_max, substream, 2318 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2319 if (err < 0) 2320 return err; 2321 2322 /* FIXME: remove */ 2323 if (runtime->dma_bytes) { 2324 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2325 if (err < 0) 2326 return err; 2327 } 2328 2329 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2330 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2331 snd_pcm_hw_rule_rate, hw, 2332 SNDRV_PCM_HW_PARAM_RATE, -1); 2333 if (err < 0) 2334 return err; 2335 } 2336 2337 /* FIXME: this belong to lowlevel */ 2338 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2339 2340 return 0; 2341 } 2342 2343 static void pcm_release_private(struct snd_pcm_substream *substream) 2344 { 2345 snd_pcm_unlink(substream); 2346 } 2347 2348 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2349 { 2350 substream->ref_count--; 2351 if (substream->ref_count > 0) 2352 return; 2353 2354 snd_pcm_drop(substream); 2355 if (substream->hw_opened) { 2356 if (substream->ops->hw_free && 2357 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2358 substream->ops->hw_free(substream); 2359 substream->ops->close(substream); 2360 substream->hw_opened = 0; 2361 } 2362 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2363 pm_qos_remove_request(&substream->latency_pm_qos_req); 2364 if (substream->pcm_release) { 2365 substream->pcm_release(substream); 2366 substream->pcm_release = NULL; 2367 } 2368 snd_pcm_detach_substream(substream); 2369 } 2370 2371 EXPORT_SYMBOL(snd_pcm_release_substream); 2372 2373 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2374 struct file *file, 2375 struct snd_pcm_substream **rsubstream) 2376 { 2377 struct snd_pcm_substream *substream; 2378 int err; 2379 2380 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2381 if (err < 0) 2382 return err; 2383 if (substream->ref_count > 1) { 2384 *rsubstream = substream; 2385 return 0; 2386 } 2387 2388 err = snd_pcm_hw_constraints_init(substream); 2389 if (err < 0) { 2390 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2391 goto error; 2392 } 2393 2394 if ((err = substream->ops->open(substream)) < 0) 2395 goto error; 2396 2397 substream->hw_opened = 1; 2398 2399 err = snd_pcm_hw_constraints_complete(substream); 2400 if (err < 0) { 2401 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2402 goto error; 2403 } 2404 2405 *rsubstream = substream; 2406 return 0; 2407 2408 error: 2409 snd_pcm_release_substream(substream); 2410 return err; 2411 } 2412 2413 EXPORT_SYMBOL(snd_pcm_open_substream); 2414 2415 static int snd_pcm_open_file(struct file *file, 2416 struct snd_pcm *pcm, 2417 int stream) 2418 { 2419 struct snd_pcm_file *pcm_file; 2420 struct snd_pcm_substream *substream; 2421 int err; 2422 2423 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2424 if (err < 0) 2425 return err; 2426 2427 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2428 if (pcm_file == NULL) { 2429 snd_pcm_release_substream(substream); 2430 return -ENOMEM; 2431 } 2432 pcm_file->substream = substream; 2433 if (substream->ref_count == 1) { 2434 substream->file = pcm_file; 2435 substream->pcm_release = pcm_release_private; 2436 } 2437 file->private_data = pcm_file; 2438 2439 return 0; 2440 } 2441 2442 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2443 { 2444 struct snd_pcm *pcm; 2445 int err = nonseekable_open(inode, file); 2446 if (err < 0) 2447 return err; 2448 pcm = snd_lookup_minor_data(iminor(inode), 2449 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2450 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2451 if (pcm) 2452 snd_card_unref(pcm->card); 2453 return err; 2454 } 2455 2456 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2457 { 2458 struct snd_pcm *pcm; 2459 int err = nonseekable_open(inode, file); 2460 if (err < 0) 2461 return err; 2462 pcm = snd_lookup_minor_data(iminor(inode), 2463 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2464 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2465 if (pcm) 2466 snd_card_unref(pcm->card); 2467 return err; 2468 } 2469 2470 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2471 { 2472 int err; 2473 wait_queue_t wait; 2474 2475 if (pcm == NULL) { 2476 err = -ENODEV; 2477 goto __error1; 2478 } 2479 err = snd_card_file_add(pcm->card, file); 2480 if (err < 0) 2481 goto __error1; 2482 if (!try_module_get(pcm->card->module)) { 2483 err = -EFAULT; 2484 goto __error2; 2485 } 2486 init_waitqueue_entry(&wait, current); 2487 add_wait_queue(&pcm->open_wait, &wait); 2488 mutex_lock(&pcm->open_mutex); 2489 while (1) { 2490 err = snd_pcm_open_file(file, pcm, stream); 2491 if (err >= 0) 2492 break; 2493 if (err == -EAGAIN) { 2494 if (file->f_flags & O_NONBLOCK) { 2495 err = -EBUSY; 2496 break; 2497 } 2498 } else 2499 break; 2500 set_current_state(TASK_INTERRUPTIBLE); 2501 mutex_unlock(&pcm->open_mutex); 2502 schedule(); 2503 mutex_lock(&pcm->open_mutex); 2504 if (pcm->card->shutdown) { 2505 err = -ENODEV; 2506 break; 2507 } 2508 if (signal_pending(current)) { 2509 err = -ERESTARTSYS; 2510 break; 2511 } 2512 } 2513 remove_wait_queue(&pcm->open_wait, &wait); 2514 mutex_unlock(&pcm->open_mutex); 2515 if (err < 0) 2516 goto __error; 2517 return err; 2518 2519 __error: 2520 module_put(pcm->card->module); 2521 __error2: 2522 snd_card_file_remove(pcm->card, file); 2523 __error1: 2524 return err; 2525 } 2526 2527 static int snd_pcm_release(struct inode *inode, struct file *file) 2528 { 2529 struct snd_pcm *pcm; 2530 struct snd_pcm_substream *substream; 2531 struct snd_pcm_file *pcm_file; 2532 2533 pcm_file = file->private_data; 2534 substream = pcm_file->substream; 2535 if (snd_BUG_ON(!substream)) 2536 return -ENXIO; 2537 pcm = substream->pcm; 2538 mutex_lock(&pcm->open_mutex); 2539 snd_pcm_release_substream(substream); 2540 kfree(pcm_file); 2541 mutex_unlock(&pcm->open_mutex); 2542 wake_up(&pcm->open_wait); 2543 module_put(pcm->card->module); 2544 snd_card_file_remove(pcm->card, file); 2545 return 0; 2546 } 2547 2548 /* check and update PCM state; return 0 or a negative error 2549 * call this inside PCM lock 2550 */ 2551 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2552 { 2553 switch (substream->runtime->status->state) { 2554 case SNDRV_PCM_STATE_DRAINING: 2555 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2556 return -EBADFD; 2557 /* Fall through */ 2558 case SNDRV_PCM_STATE_RUNNING: 2559 return snd_pcm_update_hw_ptr(substream); 2560 case SNDRV_PCM_STATE_PREPARED: 2561 case SNDRV_PCM_STATE_PAUSED: 2562 return 0; 2563 case SNDRV_PCM_STATE_SUSPENDED: 2564 return -ESTRPIPE; 2565 case SNDRV_PCM_STATE_XRUN: 2566 return -EPIPE; 2567 default: 2568 return -EBADFD; 2569 } 2570 } 2571 2572 /* update to the given appl_ptr and call ack callback if needed; 2573 * when an error is returned, take back to the original value 2574 */ 2575 static int apply_appl_ptr(struct snd_pcm_substream *substream, 2576 snd_pcm_uframes_t appl_ptr) 2577 { 2578 struct snd_pcm_runtime *runtime = substream->runtime; 2579 snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr; 2580 int ret; 2581 2582 runtime->control->appl_ptr = appl_ptr; 2583 if (substream->ops->ack) { 2584 ret = substream->ops->ack(substream); 2585 if (ret < 0) { 2586 runtime->control->appl_ptr = old_appl_ptr; 2587 return ret; 2588 } 2589 } 2590 return 0; 2591 } 2592 2593 /* increase the appl_ptr; returns the processed frames or a negative error */ 2594 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2595 snd_pcm_uframes_t frames, 2596 snd_pcm_sframes_t avail) 2597 { 2598 struct snd_pcm_runtime *runtime = substream->runtime; 2599 snd_pcm_sframes_t appl_ptr; 2600 int ret; 2601 2602 if (avail <= 0) 2603 return 0; 2604 if (frames > (snd_pcm_uframes_t)avail) 2605 frames = avail; 2606 appl_ptr = runtime->control->appl_ptr + frames; 2607 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2608 appl_ptr -= runtime->boundary; 2609 ret = apply_appl_ptr(substream, appl_ptr); 2610 return ret < 0 ? ret : frames; 2611 } 2612 2613 /* decrease the appl_ptr; returns the processed frames or a negative error */ 2614 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2615 snd_pcm_uframes_t frames, 2616 snd_pcm_sframes_t avail) 2617 { 2618 struct snd_pcm_runtime *runtime = substream->runtime; 2619 snd_pcm_sframes_t appl_ptr; 2620 int ret; 2621 2622 if (avail <= 0) 2623 return 0; 2624 if (frames > (snd_pcm_uframes_t)avail) 2625 frames = avail; 2626 appl_ptr = runtime->control->appl_ptr - frames; 2627 if (appl_ptr < 0) 2628 appl_ptr += runtime->boundary; 2629 ret = apply_appl_ptr(substream, appl_ptr); 2630 return ret < 0 ? ret : frames; 2631 } 2632 2633 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2634 snd_pcm_uframes_t frames) 2635 { 2636 struct snd_pcm_runtime *runtime = substream->runtime; 2637 snd_pcm_sframes_t ret; 2638 2639 if (frames == 0) 2640 return 0; 2641 2642 snd_pcm_stream_lock_irq(substream); 2643 ret = do_pcm_hwsync(substream); 2644 if (!ret) 2645 ret = rewind_appl_ptr(substream, frames, 2646 snd_pcm_playback_hw_avail(runtime)); 2647 snd_pcm_stream_unlock_irq(substream); 2648 return ret; 2649 } 2650 2651 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2652 snd_pcm_uframes_t frames) 2653 { 2654 struct snd_pcm_runtime *runtime = substream->runtime; 2655 snd_pcm_sframes_t ret; 2656 2657 if (frames == 0) 2658 return 0; 2659 2660 snd_pcm_stream_lock_irq(substream); 2661 ret = do_pcm_hwsync(substream); 2662 if (!ret) 2663 ret = rewind_appl_ptr(substream, frames, 2664 snd_pcm_capture_hw_avail(runtime)); 2665 snd_pcm_stream_unlock_irq(substream); 2666 return ret; 2667 } 2668 2669 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2670 snd_pcm_uframes_t frames) 2671 { 2672 struct snd_pcm_runtime *runtime = substream->runtime; 2673 snd_pcm_sframes_t ret; 2674 2675 if (frames == 0) 2676 return 0; 2677 2678 snd_pcm_stream_lock_irq(substream); 2679 ret = do_pcm_hwsync(substream); 2680 if (!ret) 2681 ret = forward_appl_ptr(substream, frames, 2682 snd_pcm_playback_avail(runtime)); 2683 snd_pcm_stream_unlock_irq(substream); 2684 return ret; 2685 } 2686 2687 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2688 snd_pcm_uframes_t frames) 2689 { 2690 struct snd_pcm_runtime *runtime = substream->runtime; 2691 snd_pcm_sframes_t ret; 2692 2693 if (frames == 0) 2694 return 0; 2695 2696 snd_pcm_stream_lock_irq(substream); 2697 ret = do_pcm_hwsync(substream); 2698 if (!ret) 2699 ret = forward_appl_ptr(substream, frames, 2700 snd_pcm_capture_avail(runtime)); 2701 snd_pcm_stream_unlock_irq(substream); 2702 return ret; 2703 } 2704 2705 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2706 { 2707 int err; 2708 2709 snd_pcm_stream_lock_irq(substream); 2710 err = do_pcm_hwsync(substream); 2711 snd_pcm_stream_unlock_irq(substream); 2712 return err; 2713 } 2714 2715 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream) 2716 { 2717 struct snd_pcm_runtime *runtime = substream->runtime; 2718 int err; 2719 snd_pcm_sframes_t n = 0; 2720 2721 snd_pcm_stream_lock_irq(substream); 2722 err = do_pcm_hwsync(substream); 2723 if (!err) { 2724 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2725 n = snd_pcm_playback_hw_avail(runtime); 2726 else 2727 n = snd_pcm_capture_avail(runtime); 2728 n += runtime->delay; 2729 } 2730 snd_pcm_stream_unlock_irq(substream); 2731 return err < 0 ? err : n; 2732 } 2733 2734 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2735 struct snd_pcm_sync_ptr __user *_sync_ptr) 2736 { 2737 struct snd_pcm_runtime *runtime = substream->runtime; 2738 struct snd_pcm_sync_ptr sync_ptr; 2739 volatile struct snd_pcm_mmap_status *status; 2740 volatile struct snd_pcm_mmap_control *control; 2741 int err; 2742 2743 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2744 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2745 return -EFAULT; 2746 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2747 return -EFAULT; 2748 status = runtime->status; 2749 control = runtime->control; 2750 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2751 err = snd_pcm_hwsync(substream); 2752 if (err < 0) 2753 return err; 2754 } 2755 snd_pcm_stream_lock_irq(substream); 2756 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2757 err = apply_appl_ptr(substream, sync_ptr.c.control.appl_ptr); 2758 if (err < 0) { 2759 snd_pcm_stream_unlock_irq(substream); 2760 return err; 2761 } 2762 } else { 2763 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2764 } 2765 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2766 control->avail_min = sync_ptr.c.control.avail_min; 2767 else 2768 sync_ptr.c.control.avail_min = control->avail_min; 2769 sync_ptr.s.status.state = status->state; 2770 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2771 sync_ptr.s.status.tstamp = status->tstamp; 2772 sync_ptr.s.status.suspended_state = status->suspended_state; 2773 snd_pcm_stream_unlock_irq(substream); 2774 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2775 return -EFAULT; 2776 return 0; 2777 } 2778 2779 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2780 { 2781 struct snd_pcm_runtime *runtime = substream->runtime; 2782 int arg; 2783 2784 if (get_user(arg, _arg)) 2785 return -EFAULT; 2786 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2787 return -EINVAL; 2788 runtime->tstamp_type = arg; 2789 return 0; 2790 } 2791 2792 static int snd_pcm_common_ioctl1(struct file *file, 2793 struct snd_pcm_substream *substream, 2794 unsigned int cmd, void __user *arg) 2795 { 2796 switch (cmd) { 2797 case SNDRV_PCM_IOCTL_PVERSION: 2798 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2799 case SNDRV_PCM_IOCTL_INFO: 2800 return snd_pcm_info_user(substream, arg); 2801 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2802 return 0; 2803 case SNDRV_PCM_IOCTL_TTSTAMP: 2804 return snd_pcm_tstamp(substream, arg); 2805 case SNDRV_PCM_IOCTL_HW_REFINE: 2806 return snd_pcm_hw_refine_user(substream, arg); 2807 case SNDRV_PCM_IOCTL_HW_PARAMS: 2808 return snd_pcm_hw_params_user(substream, arg); 2809 case SNDRV_PCM_IOCTL_HW_FREE: 2810 return snd_pcm_hw_free(substream); 2811 case SNDRV_PCM_IOCTL_SW_PARAMS: 2812 return snd_pcm_sw_params_user(substream, arg); 2813 case SNDRV_PCM_IOCTL_STATUS: 2814 return snd_pcm_status_user(substream, arg, false); 2815 case SNDRV_PCM_IOCTL_STATUS_EXT: 2816 return snd_pcm_status_user(substream, arg, true); 2817 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2818 return snd_pcm_channel_info_user(substream, arg); 2819 case SNDRV_PCM_IOCTL_PREPARE: 2820 return snd_pcm_prepare(substream, file); 2821 case SNDRV_PCM_IOCTL_RESET: 2822 return snd_pcm_reset(substream); 2823 case SNDRV_PCM_IOCTL_START: 2824 return snd_pcm_start_lock_irq(substream); 2825 case SNDRV_PCM_IOCTL_LINK: 2826 return snd_pcm_link(substream, (int)(unsigned long) arg); 2827 case SNDRV_PCM_IOCTL_UNLINK: 2828 return snd_pcm_unlink(substream); 2829 case SNDRV_PCM_IOCTL_RESUME: 2830 return snd_pcm_resume(substream); 2831 case SNDRV_PCM_IOCTL_XRUN: 2832 return snd_pcm_xrun(substream); 2833 case SNDRV_PCM_IOCTL_HWSYNC: 2834 return snd_pcm_hwsync(substream); 2835 case SNDRV_PCM_IOCTL_DELAY: 2836 { 2837 snd_pcm_sframes_t delay = snd_pcm_delay(substream); 2838 snd_pcm_sframes_t __user *res = arg; 2839 2840 if (delay < 0) 2841 return delay; 2842 if (put_user(delay, res)) 2843 return -EFAULT; 2844 return 0; 2845 } 2846 case SNDRV_PCM_IOCTL_SYNC_PTR: 2847 return snd_pcm_sync_ptr(substream, arg); 2848 #ifdef CONFIG_SND_SUPPORT_OLD_API 2849 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2850 return snd_pcm_hw_refine_old_user(substream, arg); 2851 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2852 return snd_pcm_hw_params_old_user(substream, arg); 2853 #endif 2854 case SNDRV_PCM_IOCTL_DRAIN: 2855 return snd_pcm_drain(substream, file); 2856 case SNDRV_PCM_IOCTL_DROP: 2857 return snd_pcm_drop(substream); 2858 case SNDRV_PCM_IOCTL_PAUSE: 2859 { 2860 int res; 2861 snd_pcm_stream_lock_irq(substream); 2862 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2863 snd_pcm_stream_unlock_irq(substream); 2864 return res; 2865 } 2866 } 2867 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2868 return -ENOTTY; 2869 } 2870 2871 static int snd_pcm_playback_ioctl1(struct file *file, 2872 struct snd_pcm_substream *substream, 2873 unsigned int cmd, void __user *arg) 2874 { 2875 if (snd_BUG_ON(!substream)) 2876 return -ENXIO; 2877 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2878 return -EINVAL; 2879 switch (cmd) { 2880 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2881 { 2882 struct snd_xferi xferi; 2883 struct snd_xferi __user *_xferi = arg; 2884 struct snd_pcm_runtime *runtime = substream->runtime; 2885 snd_pcm_sframes_t result; 2886 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2887 return -EBADFD; 2888 if (put_user(0, &_xferi->result)) 2889 return -EFAULT; 2890 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2891 return -EFAULT; 2892 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2893 __put_user(result, &_xferi->result); 2894 return result < 0 ? result : 0; 2895 } 2896 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2897 { 2898 struct snd_xfern xfern; 2899 struct snd_xfern __user *_xfern = arg; 2900 struct snd_pcm_runtime *runtime = substream->runtime; 2901 void __user **bufs; 2902 snd_pcm_sframes_t result; 2903 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2904 return -EBADFD; 2905 if (runtime->channels > 128) 2906 return -EINVAL; 2907 if (put_user(0, &_xfern->result)) 2908 return -EFAULT; 2909 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2910 return -EFAULT; 2911 2912 bufs = memdup_user(xfern.bufs, 2913 sizeof(void *) * runtime->channels); 2914 if (IS_ERR(bufs)) 2915 return PTR_ERR(bufs); 2916 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2917 kfree(bufs); 2918 __put_user(result, &_xfern->result); 2919 return result < 0 ? result : 0; 2920 } 2921 case SNDRV_PCM_IOCTL_REWIND: 2922 { 2923 snd_pcm_uframes_t frames; 2924 snd_pcm_uframes_t __user *_frames = arg; 2925 snd_pcm_sframes_t result; 2926 if (get_user(frames, _frames)) 2927 return -EFAULT; 2928 if (put_user(0, _frames)) 2929 return -EFAULT; 2930 result = snd_pcm_playback_rewind(substream, frames); 2931 __put_user(result, _frames); 2932 return result < 0 ? result : 0; 2933 } 2934 case SNDRV_PCM_IOCTL_FORWARD: 2935 { 2936 snd_pcm_uframes_t frames; 2937 snd_pcm_uframes_t __user *_frames = arg; 2938 snd_pcm_sframes_t result; 2939 if (get_user(frames, _frames)) 2940 return -EFAULT; 2941 if (put_user(0, _frames)) 2942 return -EFAULT; 2943 result = snd_pcm_playback_forward(substream, frames); 2944 __put_user(result, _frames); 2945 return result < 0 ? result : 0; 2946 } 2947 } 2948 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2949 } 2950 2951 static int snd_pcm_capture_ioctl1(struct file *file, 2952 struct snd_pcm_substream *substream, 2953 unsigned int cmd, void __user *arg) 2954 { 2955 if (snd_BUG_ON(!substream)) 2956 return -ENXIO; 2957 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2958 return -EINVAL; 2959 switch (cmd) { 2960 case SNDRV_PCM_IOCTL_READI_FRAMES: 2961 { 2962 struct snd_xferi xferi; 2963 struct snd_xferi __user *_xferi = arg; 2964 struct snd_pcm_runtime *runtime = substream->runtime; 2965 snd_pcm_sframes_t result; 2966 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2967 return -EBADFD; 2968 if (put_user(0, &_xferi->result)) 2969 return -EFAULT; 2970 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2971 return -EFAULT; 2972 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2973 __put_user(result, &_xferi->result); 2974 return result < 0 ? result : 0; 2975 } 2976 case SNDRV_PCM_IOCTL_READN_FRAMES: 2977 { 2978 struct snd_xfern xfern; 2979 struct snd_xfern __user *_xfern = arg; 2980 struct snd_pcm_runtime *runtime = substream->runtime; 2981 void *bufs; 2982 snd_pcm_sframes_t result; 2983 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2984 return -EBADFD; 2985 if (runtime->channels > 128) 2986 return -EINVAL; 2987 if (put_user(0, &_xfern->result)) 2988 return -EFAULT; 2989 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2990 return -EFAULT; 2991 2992 bufs = memdup_user(xfern.bufs, 2993 sizeof(void *) * runtime->channels); 2994 if (IS_ERR(bufs)) 2995 return PTR_ERR(bufs); 2996 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2997 kfree(bufs); 2998 __put_user(result, &_xfern->result); 2999 return result < 0 ? result : 0; 3000 } 3001 case SNDRV_PCM_IOCTL_REWIND: 3002 { 3003 snd_pcm_uframes_t frames; 3004 snd_pcm_uframes_t __user *_frames = arg; 3005 snd_pcm_sframes_t result; 3006 if (get_user(frames, _frames)) 3007 return -EFAULT; 3008 if (put_user(0, _frames)) 3009 return -EFAULT; 3010 result = snd_pcm_capture_rewind(substream, frames); 3011 __put_user(result, _frames); 3012 return result < 0 ? result : 0; 3013 } 3014 case SNDRV_PCM_IOCTL_FORWARD: 3015 { 3016 snd_pcm_uframes_t frames; 3017 snd_pcm_uframes_t __user *_frames = arg; 3018 snd_pcm_sframes_t result; 3019 if (get_user(frames, _frames)) 3020 return -EFAULT; 3021 if (put_user(0, _frames)) 3022 return -EFAULT; 3023 result = snd_pcm_capture_forward(substream, frames); 3024 __put_user(result, _frames); 3025 return result < 0 ? result : 0; 3026 } 3027 } 3028 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 3029 } 3030 3031 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 3032 unsigned long arg) 3033 { 3034 struct snd_pcm_file *pcm_file; 3035 3036 pcm_file = file->private_data; 3037 3038 if (((cmd >> 8) & 0xff) != 'A') 3039 return -ENOTTY; 3040 3041 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 3042 (void __user *)arg); 3043 } 3044 3045 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 3046 unsigned long arg) 3047 { 3048 struct snd_pcm_file *pcm_file; 3049 3050 pcm_file = file->private_data; 3051 3052 if (((cmd >> 8) & 0xff) != 'A') 3053 return -ENOTTY; 3054 3055 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 3056 (void __user *)arg); 3057 } 3058 3059 /** 3060 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3061 * @substream: PCM substream 3062 * @cmd: IOCTL cmd 3063 * @arg: IOCTL argument 3064 * 3065 * The function is provided primarily for OSS layer and USB gadget drivers, 3066 * and it allows only the limited set of ioctls (hw_params, sw_params, 3067 * prepare, start, drain, drop, forward). 3068 */ 3069 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3070 unsigned int cmd, void *arg) 3071 { 3072 snd_pcm_uframes_t *frames = arg; 3073 snd_pcm_sframes_t result; 3074 3075 switch (cmd) { 3076 case SNDRV_PCM_IOCTL_FORWARD: 3077 { 3078 /* provided only for OSS; capture-only and no value returned */ 3079 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3080 return -EINVAL; 3081 result = snd_pcm_capture_forward(substream, *frames); 3082 return result < 0 ? result : 0; 3083 } 3084 case SNDRV_PCM_IOCTL_HW_PARAMS: 3085 return snd_pcm_hw_params(substream, arg); 3086 case SNDRV_PCM_IOCTL_SW_PARAMS: 3087 return snd_pcm_sw_params(substream, arg); 3088 case SNDRV_PCM_IOCTL_PREPARE: 3089 return snd_pcm_prepare(substream, NULL); 3090 case SNDRV_PCM_IOCTL_START: 3091 return snd_pcm_start_lock_irq(substream); 3092 case SNDRV_PCM_IOCTL_DRAIN: 3093 return snd_pcm_drain(substream, NULL); 3094 case SNDRV_PCM_IOCTL_DROP: 3095 return snd_pcm_drop(substream); 3096 case SNDRV_PCM_IOCTL_DELAY: 3097 { 3098 result = snd_pcm_delay(substream); 3099 if (result < 0) 3100 return result; 3101 *frames = result; 3102 return 0; 3103 } 3104 default: 3105 return -EINVAL; 3106 } 3107 } 3108 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3109 3110 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3111 loff_t * offset) 3112 { 3113 struct snd_pcm_file *pcm_file; 3114 struct snd_pcm_substream *substream; 3115 struct snd_pcm_runtime *runtime; 3116 snd_pcm_sframes_t result; 3117 3118 pcm_file = file->private_data; 3119 substream = pcm_file->substream; 3120 if (PCM_RUNTIME_CHECK(substream)) 3121 return -ENXIO; 3122 runtime = substream->runtime; 3123 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3124 return -EBADFD; 3125 if (!frame_aligned(runtime, count)) 3126 return -EINVAL; 3127 count = bytes_to_frames(runtime, count); 3128 result = snd_pcm_lib_read(substream, buf, count); 3129 if (result > 0) 3130 result = frames_to_bytes(runtime, result); 3131 return result; 3132 } 3133 3134 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3135 size_t count, loff_t * offset) 3136 { 3137 struct snd_pcm_file *pcm_file; 3138 struct snd_pcm_substream *substream; 3139 struct snd_pcm_runtime *runtime; 3140 snd_pcm_sframes_t result; 3141 3142 pcm_file = file->private_data; 3143 substream = pcm_file->substream; 3144 if (PCM_RUNTIME_CHECK(substream)) 3145 return -ENXIO; 3146 runtime = substream->runtime; 3147 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3148 return -EBADFD; 3149 if (!frame_aligned(runtime, count)) 3150 return -EINVAL; 3151 count = bytes_to_frames(runtime, count); 3152 result = snd_pcm_lib_write(substream, buf, count); 3153 if (result > 0) 3154 result = frames_to_bytes(runtime, result); 3155 return result; 3156 } 3157 3158 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3159 { 3160 struct snd_pcm_file *pcm_file; 3161 struct snd_pcm_substream *substream; 3162 struct snd_pcm_runtime *runtime; 3163 snd_pcm_sframes_t result; 3164 unsigned long i; 3165 void __user **bufs; 3166 snd_pcm_uframes_t frames; 3167 3168 pcm_file = iocb->ki_filp->private_data; 3169 substream = pcm_file->substream; 3170 if (PCM_RUNTIME_CHECK(substream)) 3171 return -ENXIO; 3172 runtime = substream->runtime; 3173 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3174 return -EBADFD; 3175 if (!iter_is_iovec(to)) 3176 return -EINVAL; 3177 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3178 return -EINVAL; 3179 if (!frame_aligned(runtime, to->iov->iov_len)) 3180 return -EINVAL; 3181 frames = bytes_to_samples(runtime, to->iov->iov_len); 3182 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3183 if (bufs == NULL) 3184 return -ENOMEM; 3185 for (i = 0; i < to->nr_segs; ++i) 3186 bufs[i] = to->iov[i].iov_base; 3187 result = snd_pcm_lib_readv(substream, bufs, frames); 3188 if (result > 0) 3189 result = frames_to_bytes(runtime, result); 3190 kfree(bufs); 3191 return result; 3192 } 3193 3194 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3195 { 3196 struct snd_pcm_file *pcm_file; 3197 struct snd_pcm_substream *substream; 3198 struct snd_pcm_runtime *runtime; 3199 snd_pcm_sframes_t result; 3200 unsigned long i; 3201 void __user **bufs; 3202 snd_pcm_uframes_t frames; 3203 3204 pcm_file = iocb->ki_filp->private_data; 3205 substream = pcm_file->substream; 3206 if (PCM_RUNTIME_CHECK(substream)) 3207 return -ENXIO; 3208 runtime = substream->runtime; 3209 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3210 return -EBADFD; 3211 if (!iter_is_iovec(from)) 3212 return -EINVAL; 3213 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3214 !frame_aligned(runtime, from->iov->iov_len)) 3215 return -EINVAL; 3216 frames = bytes_to_samples(runtime, from->iov->iov_len); 3217 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3218 if (bufs == NULL) 3219 return -ENOMEM; 3220 for (i = 0; i < from->nr_segs; ++i) 3221 bufs[i] = from->iov[i].iov_base; 3222 result = snd_pcm_lib_writev(substream, bufs, frames); 3223 if (result > 0) 3224 result = frames_to_bytes(runtime, result); 3225 kfree(bufs); 3226 return result; 3227 } 3228 3229 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3230 { 3231 struct snd_pcm_file *pcm_file; 3232 struct snd_pcm_substream *substream; 3233 struct snd_pcm_runtime *runtime; 3234 unsigned int mask; 3235 snd_pcm_uframes_t avail; 3236 3237 pcm_file = file->private_data; 3238 3239 substream = pcm_file->substream; 3240 if (PCM_RUNTIME_CHECK(substream)) 3241 return POLLOUT | POLLWRNORM | POLLERR; 3242 runtime = substream->runtime; 3243 3244 poll_wait(file, &runtime->sleep, wait); 3245 3246 snd_pcm_stream_lock_irq(substream); 3247 avail = snd_pcm_playback_avail(runtime); 3248 switch (runtime->status->state) { 3249 case SNDRV_PCM_STATE_RUNNING: 3250 case SNDRV_PCM_STATE_PREPARED: 3251 case SNDRV_PCM_STATE_PAUSED: 3252 if (avail >= runtime->control->avail_min) { 3253 mask = POLLOUT | POLLWRNORM; 3254 break; 3255 } 3256 /* Fall through */ 3257 case SNDRV_PCM_STATE_DRAINING: 3258 mask = 0; 3259 break; 3260 default: 3261 mask = POLLOUT | POLLWRNORM | POLLERR; 3262 break; 3263 } 3264 snd_pcm_stream_unlock_irq(substream); 3265 return mask; 3266 } 3267 3268 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3269 { 3270 struct snd_pcm_file *pcm_file; 3271 struct snd_pcm_substream *substream; 3272 struct snd_pcm_runtime *runtime; 3273 unsigned int mask; 3274 snd_pcm_uframes_t avail; 3275 3276 pcm_file = file->private_data; 3277 3278 substream = pcm_file->substream; 3279 if (PCM_RUNTIME_CHECK(substream)) 3280 return POLLIN | POLLRDNORM | POLLERR; 3281 runtime = substream->runtime; 3282 3283 poll_wait(file, &runtime->sleep, wait); 3284 3285 snd_pcm_stream_lock_irq(substream); 3286 avail = snd_pcm_capture_avail(runtime); 3287 switch (runtime->status->state) { 3288 case SNDRV_PCM_STATE_RUNNING: 3289 case SNDRV_PCM_STATE_PREPARED: 3290 case SNDRV_PCM_STATE_PAUSED: 3291 if (avail >= runtime->control->avail_min) { 3292 mask = POLLIN | POLLRDNORM; 3293 break; 3294 } 3295 mask = 0; 3296 break; 3297 case SNDRV_PCM_STATE_DRAINING: 3298 if (avail > 0) { 3299 mask = POLLIN | POLLRDNORM; 3300 break; 3301 } 3302 /* Fall through */ 3303 default: 3304 mask = POLLIN | POLLRDNORM | POLLERR; 3305 break; 3306 } 3307 snd_pcm_stream_unlock_irq(substream); 3308 return mask; 3309 } 3310 3311 /* 3312 * mmap support 3313 */ 3314 3315 /* 3316 * Only on coherent architectures, we can mmap the status and the control records 3317 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3318 */ 3319 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3320 /* 3321 * mmap status record 3322 */ 3323 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3324 { 3325 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3326 struct snd_pcm_runtime *runtime; 3327 3328 if (substream == NULL) 3329 return VM_FAULT_SIGBUS; 3330 runtime = substream->runtime; 3331 vmf->page = virt_to_page(runtime->status); 3332 get_page(vmf->page); 3333 return 0; 3334 } 3335 3336 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3337 { 3338 .fault = snd_pcm_mmap_status_fault, 3339 }; 3340 3341 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3342 struct vm_area_struct *area) 3343 { 3344 long size; 3345 if (!(area->vm_flags & VM_READ)) 3346 return -EINVAL; 3347 size = area->vm_end - area->vm_start; 3348 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3349 return -EINVAL; 3350 area->vm_ops = &snd_pcm_vm_ops_status; 3351 area->vm_private_data = substream; 3352 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3353 return 0; 3354 } 3355 3356 /* 3357 * mmap control record 3358 */ 3359 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3360 { 3361 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3362 struct snd_pcm_runtime *runtime; 3363 3364 if (substream == NULL) 3365 return VM_FAULT_SIGBUS; 3366 runtime = substream->runtime; 3367 vmf->page = virt_to_page(runtime->control); 3368 get_page(vmf->page); 3369 return 0; 3370 } 3371 3372 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3373 { 3374 .fault = snd_pcm_mmap_control_fault, 3375 }; 3376 3377 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3378 struct vm_area_struct *area) 3379 { 3380 long size; 3381 if (!(area->vm_flags & VM_READ)) 3382 return -EINVAL; 3383 size = area->vm_end - area->vm_start; 3384 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3385 return -EINVAL; 3386 area->vm_ops = &snd_pcm_vm_ops_control; 3387 area->vm_private_data = substream; 3388 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3389 return 0; 3390 } 3391 #else /* ! coherent mmap */ 3392 /* 3393 * don't support mmap for status and control records. 3394 */ 3395 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3396 struct vm_area_struct *area) 3397 { 3398 return -ENXIO; 3399 } 3400 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3401 struct vm_area_struct *area) 3402 { 3403 return -ENXIO; 3404 } 3405 #endif /* coherent mmap */ 3406 3407 static inline struct page * 3408 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3409 { 3410 void *vaddr = substream->runtime->dma_area + ofs; 3411 return virt_to_page(vaddr); 3412 } 3413 3414 /* 3415 * fault callback for mmapping a RAM page 3416 */ 3417 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3418 { 3419 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3420 struct snd_pcm_runtime *runtime; 3421 unsigned long offset; 3422 struct page * page; 3423 size_t dma_bytes; 3424 3425 if (substream == NULL) 3426 return VM_FAULT_SIGBUS; 3427 runtime = substream->runtime; 3428 offset = vmf->pgoff << PAGE_SHIFT; 3429 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3430 if (offset > dma_bytes - PAGE_SIZE) 3431 return VM_FAULT_SIGBUS; 3432 if (substream->ops->page) 3433 page = substream->ops->page(substream, offset); 3434 else 3435 page = snd_pcm_default_page_ops(substream, offset); 3436 if (!page) 3437 return VM_FAULT_SIGBUS; 3438 get_page(page); 3439 vmf->page = page; 3440 return 0; 3441 } 3442 3443 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3444 .open = snd_pcm_mmap_data_open, 3445 .close = snd_pcm_mmap_data_close, 3446 }; 3447 3448 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3449 .open = snd_pcm_mmap_data_open, 3450 .close = snd_pcm_mmap_data_close, 3451 .fault = snd_pcm_mmap_data_fault, 3452 }; 3453 3454 /* 3455 * mmap the DMA buffer on RAM 3456 */ 3457 3458 /** 3459 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3460 * @substream: PCM substream 3461 * @area: VMA 3462 * 3463 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3464 * this function is invoked implicitly. 3465 */ 3466 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3467 struct vm_area_struct *area) 3468 { 3469 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3470 #ifdef CONFIG_GENERIC_ALLOCATOR 3471 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3472 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3473 return remap_pfn_range(area, area->vm_start, 3474 substream->dma_buffer.addr >> PAGE_SHIFT, 3475 area->vm_end - area->vm_start, area->vm_page_prot); 3476 } 3477 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3478 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3479 if (!substream->ops->page && 3480 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3481 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3482 area, 3483 substream->runtime->dma_area, 3484 substream->runtime->dma_addr, 3485 area->vm_end - area->vm_start); 3486 #endif /* CONFIG_X86 */ 3487 /* mmap with fault handler */ 3488 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3489 return 0; 3490 } 3491 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3492 3493 /* 3494 * mmap the DMA buffer on I/O memory area 3495 */ 3496 #if SNDRV_PCM_INFO_MMAP_IOMEM 3497 /** 3498 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3499 * @substream: PCM substream 3500 * @area: VMA 3501 * 3502 * When your hardware uses the iomapped pages as the hardware buffer and 3503 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3504 * is supposed to work only on limited architectures. 3505 */ 3506 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3507 struct vm_area_struct *area) 3508 { 3509 struct snd_pcm_runtime *runtime = substream->runtime;; 3510 3511 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3512 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3513 } 3514 3515 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3516 #endif /* SNDRV_PCM_INFO_MMAP */ 3517 3518 /* 3519 * mmap DMA buffer 3520 */ 3521 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3522 struct vm_area_struct *area) 3523 { 3524 struct snd_pcm_runtime *runtime; 3525 long size; 3526 unsigned long offset; 3527 size_t dma_bytes; 3528 int err; 3529 3530 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3531 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3532 return -EINVAL; 3533 } else { 3534 if (!(area->vm_flags & VM_READ)) 3535 return -EINVAL; 3536 } 3537 runtime = substream->runtime; 3538 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3539 return -EBADFD; 3540 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3541 return -ENXIO; 3542 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3543 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3544 return -EINVAL; 3545 size = area->vm_end - area->vm_start; 3546 offset = area->vm_pgoff << PAGE_SHIFT; 3547 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3548 if ((size_t)size > dma_bytes) 3549 return -EINVAL; 3550 if (offset > dma_bytes - size) 3551 return -EINVAL; 3552 3553 area->vm_ops = &snd_pcm_vm_ops_data; 3554 area->vm_private_data = substream; 3555 if (substream->ops->mmap) 3556 err = substream->ops->mmap(substream, area); 3557 else 3558 err = snd_pcm_lib_default_mmap(substream, area); 3559 if (!err) 3560 atomic_inc(&substream->mmap_count); 3561 return err; 3562 } 3563 3564 EXPORT_SYMBOL(snd_pcm_mmap_data); 3565 3566 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3567 { 3568 struct snd_pcm_file * pcm_file; 3569 struct snd_pcm_substream *substream; 3570 unsigned long offset; 3571 3572 pcm_file = file->private_data; 3573 substream = pcm_file->substream; 3574 if (PCM_RUNTIME_CHECK(substream)) 3575 return -ENXIO; 3576 3577 offset = area->vm_pgoff << PAGE_SHIFT; 3578 switch (offset) { 3579 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3580 if (pcm_file->no_compat_mmap) 3581 return -ENXIO; 3582 return snd_pcm_mmap_status(substream, file, area); 3583 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3584 if (pcm_file->no_compat_mmap) 3585 return -ENXIO; 3586 return snd_pcm_mmap_control(substream, file, area); 3587 default: 3588 return snd_pcm_mmap_data(substream, file, area); 3589 } 3590 return 0; 3591 } 3592 3593 static int snd_pcm_fasync(int fd, struct file * file, int on) 3594 { 3595 struct snd_pcm_file * pcm_file; 3596 struct snd_pcm_substream *substream; 3597 struct snd_pcm_runtime *runtime; 3598 3599 pcm_file = file->private_data; 3600 substream = pcm_file->substream; 3601 if (PCM_RUNTIME_CHECK(substream)) 3602 return -ENXIO; 3603 runtime = substream->runtime; 3604 return fasync_helper(fd, file, on, &runtime->fasync); 3605 } 3606 3607 /* 3608 * ioctl32 compat 3609 */ 3610 #ifdef CONFIG_COMPAT 3611 #include "pcm_compat.c" 3612 #else 3613 #define snd_pcm_ioctl_compat NULL 3614 #endif 3615 3616 /* 3617 * To be removed helpers to keep binary compatibility 3618 */ 3619 3620 #ifdef CONFIG_SND_SUPPORT_OLD_API 3621 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3622 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3623 3624 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3625 struct snd_pcm_hw_params_old *oparams) 3626 { 3627 unsigned int i; 3628 3629 memset(params, 0, sizeof(*params)); 3630 params->flags = oparams->flags; 3631 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3632 params->masks[i].bits[0] = oparams->masks[i]; 3633 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3634 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3635 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3636 params->info = oparams->info; 3637 params->msbits = oparams->msbits; 3638 params->rate_num = oparams->rate_num; 3639 params->rate_den = oparams->rate_den; 3640 params->fifo_size = oparams->fifo_size; 3641 } 3642 3643 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3644 struct snd_pcm_hw_params *params) 3645 { 3646 unsigned int i; 3647 3648 memset(oparams, 0, sizeof(*oparams)); 3649 oparams->flags = params->flags; 3650 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3651 oparams->masks[i] = params->masks[i].bits[0]; 3652 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3653 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3654 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3655 oparams->info = params->info; 3656 oparams->msbits = params->msbits; 3657 oparams->rate_num = params->rate_num; 3658 oparams->rate_den = params->rate_den; 3659 oparams->fifo_size = params->fifo_size; 3660 } 3661 3662 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3663 struct snd_pcm_hw_params_old __user * _oparams) 3664 { 3665 struct snd_pcm_hw_params *params; 3666 struct snd_pcm_hw_params_old *oparams = NULL; 3667 int err; 3668 3669 params = kmalloc(sizeof(*params), GFP_KERNEL); 3670 if (!params) 3671 return -ENOMEM; 3672 3673 oparams = memdup_user(_oparams, sizeof(*oparams)); 3674 if (IS_ERR(oparams)) { 3675 err = PTR_ERR(oparams); 3676 goto out; 3677 } 3678 snd_pcm_hw_convert_from_old_params(params, oparams); 3679 err = snd_pcm_hw_refine(substream, params); 3680 if (err >= 0) 3681 err = fixup_unreferenced_params(substream, params); 3682 snd_pcm_hw_convert_to_old_params(oparams, params); 3683 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3684 if (!err) 3685 err = -EFAULT; 3686 } 3687 3688 kfree(oparams); 3689 out: 3690 kfree(params); 3691 return err; 3692 } 3693 3694 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3695 struct snd_pcm_hw_params_old __user * _oparams) 3696 { 3697 struct snd_pcm_hw_params *params; 3698 struct snd_pcm_hw_params_old *oparams = NULL; 3699 int err; 3700 3701 params = kmalloc(sizeof(*params), GFP_KERNEL); 3702 if (!params) 3703 return -ENOMEM; 3704 3705 oparams = memdup_user(_oparams, sizeof(*oparams)); 3706 if (IS_ERR(oparams)) { 3707 err = PTR_ERR(oparams); 3708 goto out; 3709 } 3710 snd_pcm_hw_convert_from_old_params(params, oparams); 3711 err = snd_pcm_hw_params(substream, params); 3712 snd_pcm_hw_convert_to_old_params(oparams, params); 3713 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3714 if (!err) 3715 err = -EFAULT; 3716 } 3717 3718 kfree(oparams); 3719 out: 3720 kfree(params); 3721 return err; 3722 } 3723 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3724 3725 #ifndef CONFIG_MMU 3726 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3727 unsigned long addr, 3728 unsigned long len, 3729 unsigned long pgoff, 3730 unsigned long flags) 3731 { 3732 struct snd_pcm_file *pcm_file = file->private_data; 3733 struct snd_pcm_substream *substream = pcm_file->substream; 3734 struct snd_pcm_runtime *runtime = substream->runtime; 3735 unsigned long offset = pgoff << PAGE_SHIFT; 3736 3737 switch (offset) { 3738 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3739 return (unsigned long)runtime->status; 3740 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3741 return (unsigned long)runtime->control; 3742 default: 3743 return (unsigned long)runtime->dma_area + offset; 3744 } 3745 } 3746 #else 3747 # define snd_pcm_get_unmapped_area NULL 3748 #endif 3749 3750 /* 3751 * Register section 3752 */ 3753 3754 const struct file_operations snd_pcm_f_ops[2] = { 3755 { 3756 .owner = THIS_MODULE, 3757 .write = snd_pcm_write, 3758 .write_iter = snd_pcm_writev, 3759 .open = snd_pcm_playback_open, 3760 .release = snd_pcm_release, 3761 .llseek = no_llseek, 3762 .poll = snd_pcm_playback_poll, 3763 .unlocked_ioctl = snd_pcm_playback_ioctl, 3764 .compat_ioctl = snd_pcm_ioctl_compat, 3765 .mmap = snd_pcm_mmap, 3766 .fasync = snd_pcm_fasync, 3767 .get_unmapped_area = snd_pcm_get_unmapped_area, 3768 }, 3769 { 3770 .owner = THIS_MODULE, 3771 .read = snd_pcm_read, 3772 .read_iter = snd_pcm_readv, 3773 .open = snd_pcm_capture_open, 3774 .release = snd_pcm_release, 3775 .llseek = no_llseek, 3776 .poll = snd_pcm_capture_poll, 3777 .unlocked_ioctl = snd_pcm_capture_ioctl, 3778 .compat_ioctl = snd_pcm_ioctl_compat, 3779 .mmap = snd_pcm_mmap, 3780 .fasync = snd_pcm_fasync, 3781 .get_unmapped_area = snd_pcm_get_unmapped_area, 3782 } 3783 }; 3784