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