1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/file.h> 25 #include <linux/slab.h> 26 #include <linux/sched/signal.h> 27 #include <linux/time.h> 28 #include <linux/pm_qos.h> 29 #include <linux/io.h> 30 #include <linux/dma-mapping.h> 31 #include <sound/core.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/pcm.h> 35 #include <sound/pcm_params.h> 36 #include <sound/timer.h> 37 #include <sound/minors.h> 38 #include <linux/uio.h> 39 40 #include "pcm_local.h" 41 42 #ifdef CONFIG_SND_DEBUG 43 #define CREATE_TRACE_POINTS 44 #include "pcm_param_trace.h" 45 #else 46 #define trace_hw_mask_param_enabled() 0 47 #define trace_hw_interval_param_enabled() 0 48 #define trace_hw_mask_param(substream, type, index, prev, curr) 49 #define trace_hw_interval_param(substream, type, index, prev, curr) 50 #endif 51 52 /* 53 * Compatibility 54 */ 55 56 struct snd_pcm_hw_params_old { 57 unsigned int flags; 58 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 59 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 60 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 61 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 62 unsigned int rmask; 63 unsigned int cmask; 64 unsigned int info; 65 unsigned int msbits; 66 unsigned int rate_num; 67 unsigned int rate_den; 68 snd_pcm_uframes_t fifo_size; 69 unsigned char reserved[64]; 70 }; 71 72 #ifdef CONFIG_SND_SUPPORT_OLD_API 73 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 74 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 75 76 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 77 struct snd_pcm_hw_params_old __user * _oparams); 78 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 79 struct snd_pcm_hw_params_old __user * _oparams); 80 #endif 81 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 82 83 /* 84 * 85 */ 86 87 static DEFINE_RWLOCK(snd_pcm_link_rwlock); 88 static DECLARE_RWSEM(snd_pcm_link_rwsem); 89 90 /* Writer in rwsem may block readers even during its waiting in queue, 91 * and this may lead to a deadlock when the code path takes read sem 92 * twice (e.g. one in snd_pcm_action_nonatomic() and another in 93 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to 94 * spin until it gets the lock. 95 */ 96 static inline void down_write_nonblock(struct rw_semaphore *lock) 97 { 98 while (!down_write_trylock(lock)) 99 cond_resched(); 100 } 101 102 /** 103 * snd_pcm_stream_lock - Lock the PCM stream 104 * @substream: PCM substream 105 * 106 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 107 * flag of the given substream. This also takes the global link rw lock 108 * (or rw sem), too, for avoiding the race with linked streams. 109 */ 110 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 111 { 112 if (substream->pcm->nonatomic) { 113 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING); 114 mutex_lock(&substream->self_group.mutex); 115 } else { 116 read_lock(&snd_pcm_link_rwlock); 117 spin_lock(&substream->self_group.lock); 118 } 119 } 120 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 121 122 /** 123 * snd_pcm_stream_lock - Unlock the PCM stream 124 * @substream: PCM substream 125 * 126 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 127 */ 128 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 129 { 130 if (substream->pcm->nonatomic) { 131 mutex_unlock(&substream->self_group.mutex); 132 up_read(&snd_pcm_link_rwsem); 133 } else { 134 spin_unlock(&substream->self_group.lock); 135 read_unlock(&snd_pcm_link_rwlock); 136 } 137 } 138 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 139 140 /** 141 * snd_pcm_stream_lock_irq - Lock the PCM stream 142 * @substream: PCM substream 143 * 144 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 145 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 146 * as snd_pcm_stream_lock(). 147 */ 148 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 149 { 150 if (!substream->pcm->nonatomic) 151 local_irq_disable(); 152 snd_pcm_stream_lock(substream); 153 } 154 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 155 156 /** 157 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 158 * @substream: PCM substream 159 * 160 * This is a counter-part of snd_pcm_stream_lock_irq(). 161 */ 162 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 163 { 164 snd_pcm_stream_unlock(substream); 165 if (!substream->pcm->nonatomic) 166 local_irq_enable(); 167 } 168 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 169 170 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 171 { 172 unsigned long flags = 0; 173 if (!substream->pcm->nonatomic) 174 local_irq_save(flags); 175 snd_pcm_stream_lock(substream); 176 return flags; 177 } 178 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 179 180 /** 181 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 182 * @substream: PCM substream 183 * @flags: irq flags 184 * 185 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 186 */ 187 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 188 unsigned long flags) 189 { 190 snd_pcm_stream_unlock(substream); 191 if (!substream->pcm->nonatomic) 192 local_irq_restore(flags); 193 } 194 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 195 196 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 197 { 198 struct snd_pcm_runtime *runtime; 199 struct snd_pcm *pcm = substream->pcm; 200 struct snd_pcm_str *pstr = substream->pstr; 201 202 memset(info, 0, sizeof(*info)); 203 info->card = pcm->card->number; 204 info->device = pcm->device; 205 info->stream = substream->stream; 206 info->subdevice = substream->number; 207 strlcpy(info->id, pcm->id, sizeof(info->id)); 208 strlcpy(info->name, pcm->name, sizeof(info->name)); 209 info->dev_class = pcm->dev_class; 210 info->dev_subclass = pcm->dev_subclass; 211 info->subdevices_count = pstr->substream_count; 212 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 213 strlcpy(info->subname, substream->name, sizeof(info->subname)); 214 runtime = substream->runtime; 215 216 return 0; 217 } 218 219 int snd_pcm_info_user(struct snd_pcm_substream *substream, 220 struct snd_pcm_info __user * _info) 221 { 222 struct snd_pcm_info *info; 223 int err; 224 225 info = kmalloc(sizeof(*info), GFP_KERNEL); 226 if (! info) 227 return -ENOMEM; 228 err = snd_pcm_info(substream, info); 229 if (err >= 0) { 230 if (copy_to_user(_info, info, sizeof(*info))) 231 err = -EFAULT; 232 } 233 kfree(info); 234 return err; 235 } 236 237 static bool hw_support_mmap(struct snd_pcm_substream *substream) 238 { 239 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 240 return false; 241 /* check architectures that return -EINVAL from dma_mmap_coherent() */ 242 /* FIXME: this should be some global flag */ 243 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\ 244 defined(CONFIG_PARISC) || defined(CONFIG_XTENSA) 245 if (!substream->ops->mmap && 246 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 247 return false; 248 #endif 249 return true; 250 } 251 252 static int constrain_mask_params(struct snd_pcm_substream *substream, 253 struct snd_pcm_hw_params *params) 254 { 255 struct snd_pcm_hw_constraints *constrs = 256 &substream->runtime->hw_constraints; 257 struct snd_mask *m; 258 unsigned int k; 259 struct snd_mask old_mask; 260 int changed; 261 262 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 263 m = hw_param_mask(params, k); 264 if (snd_mask_empty(m)) 265 return -EINVAL; 266 267 /* This parameter is not requested to change by a caller. */ 268 if (!(params->rmask & (1 << k))) 269 continue; 270 271 if (trace_hw_mask_param_enabled()) 272 old_mask = *m; 273 274 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 275 if (changed < 0) 276 return changed; 277 if (changed == 0) 278 continue; 279 280 /* Set corresponding flag so that the caller gets it. */ 281 trace_hw_mask_param(substream, k, 0, &old_mask, m); 282 params->cmask |= 1 << k; 283 } 284 285 return 0; 286 } 287 288 static int constrain_interval_params(struct snd_pcm_substream *substream, 289 struct snd_pcm_hw_params *params) 290 { 291 struct snd_pcm_hw_constraints *constrs = 292 &substream->runtime->hw_constraints; 293 struct snd_interval *i; 294 unsigned int k; 295 struct snd_interval old_interval; 296 int changed; 297 298 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 299 i = hw_param_interval(params, k); 300 if (snd_interval_empty(i)) 301 return -EINVAL; 302 303 /* This parameter is not requested to change by a caller. */ 304 if (!(params->rmask & (1 << k))) 305 continue; 306 307 if (trace_hw_interval_param_enabled()) 308 old_interval = *i; 309 310 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 311 if (changed < 0) 312 return changed; 313 if (changed == 0) 314 continue; 315 316 /* Set corresponding flag so that the caller gets it. */ 317 trace_hw_interval_param(substream, k, 0, &old_interval, i); 318 params->cmask |= 1 << k; 319 } 320 321 return 0; 322 } 323 324 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 325 struct snd_pcm_hw_params *params) 326 { 327 struct snd_pcm_hw_constraints *constrs = 328 &substream->runtime->hw_constraints; 329 unsigned int k; 330 unsigned int rstamps[constrs->rules_num]; 331 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 332 unsigned int stamp; 333 struct snd_pcm_hw_rule *r; 334 unsigned int d; 335 struct snd_mask old_mask; 336 struct snd_interval old_interval; 337 bool again; 338 int changed; 339 340 /* 341 * Each application of rule has own sequence number. 342 * 343 * Each member of 'rstamps' array represents the sequence number of 344 * recent application of corresponding rule. 345 */ 346 for (k = 0; k < constrs->rules_num; k++) 347 rstamps[k] = 0; 348 349 /* 350 * Each member of 'vstamps' array represents the sequence number of 351 * recent application of rule in which corresponding parameters were 352 * changed. 353 * 354 * In initial state, elements corresponding to parameters requested by 355 * a caller is 1. For unrequested parameters, corresponding members 356 * have 0 so that the parameters are never changed anymore. 357 */ 358 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 359 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 360 361 /* Due to the above design, actual sequence number starts at 2. */ 362 stamp = 2; 363 retry: 364 /* Apply all rules in order. */ 365 again = false; 366 for (k = 0; k < constrs->rules_num; k++) { 367 r = &constrs->rules[k]; 368 369 /* 370 * Check condition bits of this rule. When the rule has 371 * some condition bits, parameter without the bits is 372 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 373 * is an example of the condition bits. 374 */ 375 if (r->cond && !(r->cond & params->flags)) 376 continue; 377 378 /* 379 * The 'deps' array includes maximum three dependencies 380 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth 381 * member of this array is a sentinel and should be 382 * negative value. 383 * 384 * This rule should be processed in this time when dependent 385 * parameters were changed at former applications of the other 386 * rules. 387 */ 388 for (d = 0; r->deps[d] >= 0; d++) { 389 if (vstamps[r->deps[d]] > rstamps[k]) 390 break; 391 } 392 if (r->deps[d] < 0) 393 continue; 394 395 if (trace_hw_mask_param_enabled()) { 396 if (hw_is_mask(r->var)) 397 old_mask = *hw_param_mask(params, r->var); 398 } 399 if (trace_hw_interval_param_enabled()) { 400 if (hw_is_interval(r->var)) 401 old_interval = *hw_param_interval(params, r->var); 402 } 403 404 changed = r->func(params, r); 405 if (changed < 0) 406 return changed; 407 408 /* 409 * When the parameter is changed, notify it to the caller 410 * by corresponding returned bit, then preparing for next 411 * iteration. 412 */ 413 if (changed && r->var >= 0) { 414 if (hw_is_mask(r->var)) { 415 trace_hw_mask_param(substream, r->var, 416 k + 1, &old_mask, 417 hw_param_mask(params, r->var)); 418 } 419 if (hw_is_interval(r->var)) { 420 trace_hw_interval_param(substream, r->var, 421 k + 1, &old_interval, 422 hw_param_interval(params, r->var)); 423 } 424 425 params->cmask |= (1 << r->var); 426 vstamps[r->var] = stamp; 427 again = true; 428 } 429 430 rstamps[k] = stamp++; 431 } 432 433 /* Iterate to evaluate all rules till no parameters are changed. */ 434 if (again) 435 goto retry; 436 437 return 0; 438 } 439 440 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 441 struct snd_pcm_hw_params *params) 442 { 443 const struct snd_interval *i; 444 const struct snd_mask *m; 445 int err; 446 447 if (!params->msbits) { 448 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 449 if (snd_interval_single(i)) 450 params->msbits = snd_interval_value(i); 451 } 452 453 if (!params->rate_den) { 454 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 455 if (snd_interval_single(i)) { 456 params->rate_num = snd_interval_value(i); 457 params->rate_den = 1; 458 } 459 } 460 461 if (!params->fifo_size) { 462 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 463 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 464 if (snd_mask_single(m) && snd_interval_single(i)) { 465 err = substream->ops->ioctl(substream, 466 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 467 if (err < 0) 468 return err; 469 } 470 } 471 472 if (!params->info) { 473 params->info = substream->runtime->hw.info; 474 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 475 SNDRV_PCM_INFO_DRAIN_TRIGGER); 476 if (!hw_support_mmap(substream)) 477 params->info &= ~(SNDRV_PCM_INFO_MMAP | 478 SNDRV_PCM_INFO_MMAP_VALID); 479 } 480 481 return 0; 482 } 483 484 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 485 struct snd_pcm_hw_params *params) 486 { 487 int err; 488 489 params->info = 0; 490 params->fifo_size = 0; 491 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 492 params->msbits = 0; 493 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 494 params->rate_num = 0; 495 params->rate_den = 0; 496 } 497 498 err = constrain_mask_params(substream, params); 499 if (err < 0) 500 return err; 501 502 err = constrain_interval_params(substream, params); 503 if (err < 0) 504 return err; 505 506 err = constrain_params_by_rules(substream, params); 507 if (err < 0) 508 return err; 509 510 params->rmask = 0; 511 512 return 0; 513 } 514 EXPORT_SYMBOL(snd_pcm_hw_refine); 515 516 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 517 struct snd_pcm_hw_params __user * _params) 518 { 519 struct snd_pcm_hw_params *params; 520 int err; 521 522 params = memdup_user(_params, sizeof(*params)); 523 if (IS_ERR(params)) 524 return PTR_ERR(params); 525 526 err = snd_pcm_hw_refine(substream, params); 527 if (err < 0) 528 goto end; 529 530 err = fixup_unreferenced_params(substream, params); 531 if (err < 0) 532 goto end; 533 534 if (copy_to_user(_params, params, sizeof(*params))) 535 err = -EFAULT; 536 end: 537 kfree(params); 538 return err; 539 } 540 541 static int period_to_usecs(struct snd_pcm_runtime *runtime) 542 { 543 int usecs; 544 545 if (! runtime->rate) 546 return -1; /* invalid */ 547 548 /* take 75% of period time as the deadline */ 549 usecs = (750000 / runtime->rate) * runtime->period_size; 550 usecs += ((750000 % runtime->rate) * runtime->period_size) / 551 runtime->rate; 552 553 return usecs; 554 } 555 556 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 557 { 558 snd_pcm_stream_lock_irq(substream); 559 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 560 substream->runtime->status->state = state; 561 snd_pcm_stream_unlock_irq(substream); 562 } 563 564 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 565 int event) 566 { 567 #ifdef CONFIG_SND_PCM_TIMER 568 if (substream->timer) 569 snd_timer_notify(substream->timer, event, 570 &substream->runtime->trigger_tstamp); 571 #endif 572 } 573 574 /** 575 * snd_pcm_hw_param_choose - choose a configuration defined by @params 576 * @pcm: PCM instance 577 * @params: the hw_params instance 578 * 579 * Choose one configuration from configuration space defined by @params. 580 * The configuration chosen is that obtained fixing in this order: 581 * first access, first format, first subformat, min channels, 582 * min rate, min period time, max buffer size, min tick time 583 * 584 * Return: Zero if successful, or a negative error code on failure. 585 */ 586 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 587 struct snd_pcm_hw_params *params) 588 { 589 static const int vars[] = { 590 SNDRV_PCM_HW_PARAM_ACCESS, 591 SNDRV_PCM_HW_PARAM_FORMAT, 592 SNDRV_PCM_HW_PARAM_SUBFORMAT, 593 SNDRV_PCM_HW_PARAM_CHANNELS, 594 SNDRV_PCM_HW_PARAM_RATE, 595 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 596 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 597 SNDRV_PCM_HW_PARAM_TICK_TIME, 598 -1 599 }; 600 const int *v; 601 struct snd_mask old_mask; 602 struct snd_interval old_interval; 603 int changed; 604 605 for (v = vars; *v != -1; v++) { 606 /* Keep old parameter to trace. */ 607 if (trace_hw_mask_param_enabled()) { 608 if (hw_is_mask(*v)) 609 old_mask = *hw_param_mask(params, *v); 610 } 611 if (trace_hw_interval_param_enabled()) { 612 if (hw_is_interval(*v)) 613 old_interval = *hw_param_interval(params, *v); 614 } 615 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 616 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 617 else 618 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 619 if (snd_BUG_ON(changed < 0)) 620 return changed; 621 if (changed == 0) 622 continue; 623 624 /* Trace the changed parameter. */ 625 if (hw_is_mask(*v)) { 626 trace_hw_mask_param(pcm, *v, 0, &old_mask, 627 hw_param_mask(params, *v)); 628 } 629 if (hw_is_interval(*v)) { 630 trace_hw_interval_param(pcm, *v, 0, &old_interval, 631 hw_param_interval(params, *v)); 632 } 633 } 634 635 return 0; 636 } 637 638 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 639 struct snd_pcm_hw_params *params) 640 { 641 struct snd_pcm_runtime *runtime; 642 int err, usecs; 643 unsigned int bits; 644 snd_pcm_uframes_t frames; 645 646 if (PCM_RUNTIME_CHECK(substream)) 647 return -ENXIO; 648 runtime = substream->runtime; 649 snd_pcm_stream_lock_irq(substream); 650 switch (runtime->status->state) { 651 case SNDRV_PCM_STATE_OPEN: 652 case SNDRV_PCM_STATE_SETUP: 653 case SNDRV_PCM_STATE_PREPARED: 654 break; 655 default: 656 snd_pcm_stream_unlock_irq(substream); 657 return -EBADFD; 658 } 659 snd_pcm_stream_unlock_irq(substream); 660 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 661 if (!substream->oss.oss) 662 #endif 663 if (atomic_read(&substream->mmap_count)) 664 return -EBADFD; 665 666 params->rmask = ~0U; 667 err = snd_pcm_hw_refine(substream, params); 668 if (err < 0) 669 goto _error; 670 671 err = snd_pcm_hw_params_choose(substream, params); 672 if (err < 0) 673 goto _error; 674 675 err = fixup_unreferenced_params(substream, params); 676 if (err < 0) 677 goto _error; 678 679 if (substream->ops->hw_params != NULL) { 680 err = substream->ops->hw_params(substream, params); 681 if (err < 0) 682 goto _error; 683 } 684 685 runtime->access = params_access(params); 686 runtime->format = params_format(params); 687 runtime->subformat = params_subformat(params); 688 runtime->channels = params_channels(params); 689 runtime->rate = params_rate(params); 690 runtime->period_size = params_period_size(params); 691 runtime->periods = params_periods(params); 692 runtime->buffer_size = params_buffer_size(params); 693 runtime->info = params->info; 694 runtime->rate_num = params->rate_num; 695 runtime->rate_den = params->rate_den; 696 runtime->no_period_wakeup = 697 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 698 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 699 700 bits = snd_pcm_format_physical_width(runtime->format); 701 runtime->sample_bits = bits; 702 bits *= runtime->channels; 703 runtime->frame_bits = bits; 704 frames = 1; 705 while (bits % 8 != 0) { 706 bits *= 2; 707 frames *= 2; 708 } 709 runtime->byte_align = bits / 8; 710 runtime->min_align = frames; 711 712 /* Default sw params */ 713 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 714 runtime->period_step = 1; 715 runtime->control->avail_min = runtime->period_size; 716 runtime->start_threshold = 1; 717 runtime->stop_threshold = runtime->buffer_size; 718 runtime->silence_threshold = 0; 719 runtime->silence_size = 0; 720 runtime->boundary = runtime->buffer_size; 721 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 722 runtime->boundary *= 2; 723 724 snd_pcm_timer_resolution_change(substream); 725 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 726 727 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 728 pm_qos_remove_request(&substream->latency_pm_qos_req); 729 if ((usecs = period_to_usecs(runtime)) >= 0) 730 pm_qos_add_request(&substream->latency_pm_qos_req, 731 PM_QOS_CPU_DMA_LATENCY, usecs); 732 return 0; 733 _error: 734 /* hardware might be unusable from this time, 735 so we force application to retry to set 736 the correct hardware parameter settings */ 737 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 738 if (substream->ops->hw_free != NULL) 739 substream->ops->hw_free(substream); 740 return err; 741 } 742 743 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 744 struct snd_pcm_hw_params __user * _params) 745 { 746 struct snd_pcm_hw_params *params; 747 int err; 748 749 params = memdup_user(_params, sizeof(*params)); 750 if (IS_ERR(params)) 751 return PTR_ERR(params); 752 753 err = snd_pcm_hw_params(substream, params); 754 if (err < 0) 755 goto end; 756 757 if (copy_to_user(_params, params, sizeof(*params))) 758 err = -EFAULT; 759 end: 760 kfree(params); 761 return err; 762 } 763 764 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 765 { 766 struct snd_pcm_runtime *runtime; 767 int result = 0; 768 769 if (PCM_RUNTIME_CHECK(substream)) 770 return -ENXIO; 771 runtime = substream->runtime; 772 snd_pcm_stream_lock_irq(substream); 773 switch (runtime->status->state) { 774 case SNDRV_PCM_STATE_SETUP: 775 case SNDRV_PCM_STATE_PREPARED: 776 break; 777 default: 778 snd_pcm_stream_unlock_irq(substream); 779 return -EBADFD; 780 } 781 snd_pcm_stream_unlock_irq(substream); 782 if (atomic_read(&substream->mmap_count)) 783 return -EBADFD; 784 if (substream->ops->hw_free) 785 result = substream->ops->hw_free(substream); 786 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 787 pm_qos_remove_request(&substream->latency_pm_qos_req); 788 return result; 789 } 790 791 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 792 struct snd_pcm_sw_params *params) 793 { 794 struct snd_pcm_runtime *runtime; 795 int err; 796 797 if (PCM_RUNTIME_CHECK(substream)) 798 return -ENXIO; 799 runtime = substream->runtime; 800 snd_pcm_stream_lock_irq(substream); 801 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 802 snd_pcm_stream_unlock_irq(substream); 803 return -EBADFD; 804 } 805 snd_pcm_stream_unlock_irq(substream); 806 807 if (params->tstamp_mode < 0 || 808 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 809 return -EINVAL; 810 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 811 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 812 return -EINVAL; 813 if (params->avail_min == 0) 814 return -EINVAL; 815 if (params->silence_size >= runtime->boundary) { 816 if (params->silence_threshold != 0) 817 return -EINVAL; 818 } else { 819 if (params->silence_size > params->silence_threshold) 820 return -EINVAL; 821 if (params->silence_threshold > runtime->buffer_size) 822 return -EINVAL; 823 } 824 err = 0; 825 snd_pcm_stream_lock_irq(substream); 826 runtime->tstamp_mode = params->tstamp_mode; 827 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 828 runtime->tstamp_type = params->tstamp_type; 829 runtime->period_step = params->period_step; 830 runtime->control->avail_min = params->avail_min; 831 runtime->start_threshold = params->start_threshold; 832 runtime->stop_threshold = params->stop_threshold; 833 runtime->silence_threshold = params->silence_threshold; 834 runtime->silence_size = params->silence_size; 835 params->boundary = runtime->boundary; 836 if (snd_pcm_running(substream)) { 837 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 838 runtime->silence_size > 0) 839 snd_pcm_playback_silence(substream, ULONG_MAX); 840 err = snd_pcm_update_state(substream, runtime); 841 } 842 snd_pcm_stream_unlock_irq(substream); 843 return err; 844 } 845 846 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 847 struct snd_pcm_sw_params __user * _params) 848 { 849 struct snd_pcm_sw_params params; 850 int err; 851 if (copy_from_user(¶ms, _params, sizeof(params))) 852 return -EFAULT; 853 err = snd_pcm_sw_params(substream, ¶ms); 854 if (copy_to_user(_params, ¶ms, sizeof(params))) 855 return -EFAULT; 856 return err; 857 } 858 859 int snd_pcm_status(struct snd_pcm_substream *substream, 860 struct snd_pcm_status *status) 861 { 862 struct snd_pcm_runtime *runtime = substream->runtime; 863 864 snd_pcm_stream_lock_irq(substream); 865 866 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 867 &runtime->audio_tstamp_config); 868 869 /* backwards compatible behavior */ 870 if (runtime->audio_tstamp_config.type_requested == 871 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 872 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 873 runtime->audio_tstamp_config.type_requested = 874 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 875 else 876 runtime->audio_tstamp_config.type_requested = 877 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 878 runtime->audio_tstamp_report.valid = 0; 879 } else 880 runtime->audio_tstamp_report.valid = 1; 881 882 status->state = runtime->status->state; 883 status->suspended_state = runtime->status->suspended_state; 884 if (status->state == SNDRV_PCM_STATE_OPEN) 885 goto _end; 886 status->trigger_tstamp = runtime->trigger_tstamp; 887 if (snd_pcm_running(substream)) { 888 snd_pcm_update_hw_ptr(substream); 889 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 890 status->tstamp = runtime->status->tstamp; 891 status->driver_tstamp = runtime->driver_tstamp; 892 status->audio_tstamp = 893 runtime->status->audio_tstamp; 894 if (runtime->audio_tstamp_report.valid == 1) 895 /* backwards compatibility, no report provided in COMPAT mode */ 896 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 897 &status->audio_tstamp_accuracy, 898 &runtime->audio_tstamp_report); 899 900 goto _tstamp_end; 901 } 902 } else { 903 /* get tstamp only in fallback mode and only if enabled */ 904 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 905 snd_pcm_gettime(runtime, &status->tstamp); 906 } 907 _tstamp_end: 908 status->appl_ptr = runtime->control->appl_ptr; 909 status->hw_ptr = runtime->status->hw_ptr; 910 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 911 status->avail = snd_pcm_playback_avail(runtime); 912 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 913 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 914 status->delay = runtime->buffer_size - status->avail; 915 status->delay += runtime->delay; 916 } else 917 status->delay = 0; 918 } else { 919 status->avail = snd_pcm_capture_avail(runtime); 920 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 921 status->delay = status->avail + runtime->delay; 922 else 923 status->delay = 0; 924 } 925 status->avail_max = runtime->avail_max; 926 status->overrange = runtime->overrange; 927 runtime->avail_max = 0; 928 runtime->overrange = 0; 929 _end: 930 snd_pcm_stream_unlock_irq(substream); 931 return 0; 932 } 933 934 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 935 struct snd_pcm_status __user * _status, 936 bool ext) 937 { 938 struct snd_pcm_status status; 939 int res; 940 941 memset(&status, 0, sizeof(status)); 942 /* 943 * with extension, parameters are read/write, 944 * get audio_tstamp_data from user, 945 * ignore rest of status structure 946 */ 947 if (ext && get_user(status.audio_tstamp_data, 948 (u32 __user *)(&_status->audio_tstamp_data))) 949 return -EFAULT; 950 res = snd_pcm_status(substream, &status); 951 if (res < 0) 952 return res; 953 if (copy_to_user(_status, &status, sizeof(status))) 954 return -EFAULT; 955 return 0; 956 } 957 958 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 959 struct snd_pcm_channel_info * info) 960 { 961 struct snd_pcm_runtime *runtime; 962 unsigned int channel; 963 964 channel = info->channel; 965 runtime = substream->runtime; 966 snd_pcm_stream_lock_irq(substream); 967 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 968 snd_pcm_stream_unlock_irq(substream); 969 return -EBADFD; 970 } 971 snd_pcm_stream_unlock_irq(substream); 972 if (channel >= runtime->channels) 973 return -EINVAL; 974 memset(info, 0, sizeof(*info)); 975 info->channel = channel; 976 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 977 } 978 979 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 980 struct snd_pcm_channel_info __user * _info) 981 { 982 struct snd_pcm_channel_info info; 983 int res; 984 985 if (copy_from_user(&info, _info, sizeof(info))) 986 return -EFAULT; 987 res = snd_pcm_channel_info(substream, &info); 988 if (res < 0) 989 return res; 990 if (copy_to_user(_info, &info, sizeof(info))) 991 return -EFAULT; 992 return 0; 993 } 994 995 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 996 { 997 struct snd_pcm_runtime *runtime = substream->runtime; 998 if (runtime->trigger_master == NULL) 999 return; 1000 if (runtime->trigger_master == substream) { 1001 if (!runtime->trigger_tstamp_latched) 1002 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1003 } else { 1004 snd_pcm_trigger_tstamp(runtime->trigger_master); 1005 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1006 } 1007 runtime->trigger_master = NULL; 1008 } 1009 1010 struct action_ops { 1011 int (*pre_action)(struct snd_pcm_substream *substream, int state); 1012 int (*do_action)(struct snd_pcm_substream *substream, int state); 1013 void (*undo_action)(struct snd_pcm_substream *substream, int state); 1014 void (*post_action)(struct snd_pcm_substream *substream, int state); 1015 }; 1016 1017 /* 1018 * this functions is core for handling of linked stream 1019 * Note: the stream state might be changed also on failure 1020 * Note2: call with calling stream lock + link lock 1021 */ 1022 static int snd_pcm_action_group(const struct action_ops *ops, 1023 struct snd_pcm_substream *substream, 1024 int state, int do_lock) 1025 { 1026 struct snd_pcm_substream *s = NULL; 1027 struct snd_pcm_substream *s1; 1028 int res = 0, depth = 1; 1029 1030 snd_pcm_group_for_each_entry(s, substream) { 1031 if (do_lock && s != substream) { 1032 if (s->pcm->nonatomic) 1033 mutex_lock_nested(&s->self_group.mutex, depth); 1034 else 1035 spin_lock_nested(&s->self_group.lock, depth); 1036 depth++; 1037 } 1038 res = ops->pre_action(s, state); 1039 if (res < 0) 1040 goto _unlock; 1041 } 1042 snd_pcm_group_for_each_entry(s, substream) { 1043 res = ops->do_action(s, state); 1044 if (res < 0) { 1045 if (ops->undo_action) { 1046 snd_pcm_group_for_each_entry(s1, substream) { 1047 if (s1 == s) /* failed stream */ 1048 break; 1049 ops->undo_action(s1, state); 1050 } 1051 } 1052 s = NULL; /* unlock all */ 1053 goto _unlock; 1054 } 1055 } 1056 snd_pcm_group_for_each_entry(s, substream) { 1057 ops->post_action(s, state); 1058 } 1059 _unlock: 1060 if (do_lock) { 1061 /* unlock streams */ 1062 snd_pcm_group_for_each_entry(s1, substream) { 1063 if (s1 != substream) { 1064 if (s1->pcm->nonatomic) 1065 mutex_unlock(&s1->self_group.mutex); 1066 else 1067 spin_unlock(&s1->self_group.lock); 1068 } 1069 if (s1 == s) /* end */ 1070 break; 1071 } 1072 } 1073 return res; 1074 } 1075 1076 /* 1077 * Note: call with stream lock 1078 */ 1079 static int snd_pcm_action_single(const struct action_ops *ops, 1080 struct snd_pcm_substream *substream, 1081 int state) 1082 { 1083 int res; 1084 1085 res = ops->pre_action(substream, state); 1086 if (res < 0) 1087 return res; 1088 res = ops->do_action(substream, state); 1089 if (res == 0) 1090 ops->post_action(substream, state); 1091 else if (ops->undo_action) 1092 ops->undo_action(substream, state); 1093 return res; 1094 } 1095 1096 /* 1097 * Note: call with stream lock 1098 */ 1099 static int snd_pcm_action(const struct action_ops *ops, 1100 struct snd_pcm_substream *substream, 1101 int state) 1102 { 1103 int res; 1104 1105 if (!snd_pcm_stream_linked(substream)) 1106 return snd_pcm_action_single(ops, substream, state); 1107 1108 if (substream->pcm->nonatomic) { 1109 if (!mutex_trylock(&substream->group->mutex)) { 1110 mutex_unlock(&substream->self_group.mutex); 1111 mutex_lock(&substream->group->mutex); 1112 mutex_lock(&substream->self_group.mutex); 1113 } 1114 res = snd_pcm_action_group(ops, substream, state, 1); 1115 mutex_unlock(&substream->group->mutex); 1116 } else { 1117 if (!spin_trylock(&substream->group->lock)) { 1118 spin_unlock(&substream->self_group.lock); 1119 spin_lock(&substream->group->lock); 1120 spin_lock(&substream->self_group.lock); 1121 } 1122 res = snd_pcm_action_group(ops, substream, state, 1); 1123 spin_unlock(&substream->group->lock); 1124 } 1125 return res; 1126 } 1127 1128 /* 1129 * Note: don't use any locks before 1130 */ 1131 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1132 struct snd_pcm_substream *substream, 1133 int state) 1134 { 1135 int res; 1136 1137 snd_pcm_stream_lock_irq(substream); 1138 res = snd_pcm_action(ops, substream, state); 1139 snd_pcm_stream_unlock_irq(substream); 1140 return res; 1141 } 1142 1143 /* 1144 */ 1145 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1146 struct snd_pcm_substream *substream, 1147 int state) 1148 { 1149 int res; 1150 1151 down_read(&snd_pcm_link_rwsem); 1152 if (snd_pcm_stream_linked(substream)) 1153 res = snd_pcm_action_group(ops, substream, state, 0); 1154 else 1155 res = snd_pcm_action_single(ops, substream, state); 1156 up_read(&snd_pcm_link_rwsem); 1157 return res; 1158 } 1159 1160 /* 1161 * start callbacks 1162 */ 1163 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1164 { 1165 struct snd_pcm_runtime *runtime = substream->runtime; 1166 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1167 return -EBADFD; 1168 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1169 !snd_pcm_playback_data(substream)) 1170 return -EPIPE; 1171 runtime->trigger_tstamp_latched = false; 1172 runtime->trigger_master = substream; 1173 return 0; 1174 } 1175 1176 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1177 { 1178 if (substream->runtime->trigger_master != substream) 1179 return 0; 1180 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1181 } 1182 1183 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1184 { 1185 if (substream->runtime->trigger_master == substream) 1186 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1187 } 1188 1189 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1190 { 1191 struct snd_pcm_runtime *runtime = substream->runtime; 1192 snd_pcm_trigger_tstamp(substream); 1193 runtime->hw_ptr_jiffies = jiffies; 1194 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1195 runtime->rate; 1196 runtime->status->state = state; 1197 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1198 runtime->silence_size > 0) 1199 snd_pcm_playback_silence(substream, ULONG_MAX); 1200 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1201 } 1202 1203 static const struct action_ops snd_pcm_action_start = { 1204 .pre_action = snd_pcm_pre_start, 1205 .do_action = snd_pcm_do_start, 1206 .undo_action = snd_pcm_undo_start, 1207 .post_action = snd_pcm_post_start 1208 }; 1209 1210 /** 1211 * snd_pcm_start - start all linked streams 1212 * @substream: the PCM substream instance 1213 * 1214 * Return: Zero if successful, or a negative error code. 1215 * The stream lock must be acquired before calling this function. 1216 */ 1217 int snd_pcm_start(struct snd_pcm_substream *substream) 1218 { 1219 return snd_pcm_action(&snd_pcm_action_start, substream, 1220 SNDRV_PCM_STATE_RUNNING); 1221 } 1222 1223 /* take the stream lock and start the streams */ 1224 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1225 { 1226 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1227 SNDRV_PCM_STATE_RUNNING); 1228 } 1229 1230 /* 1231 * stop callbacks 1232 */ 1233 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1234 { 1235 struct snd_pcm_runtime *runtime = substream->runtime; 1236 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1237 return -EBADFD; 1238 runtime->trigger_master = substream; 1239 return 0; 1240 } 1241 1242 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1243 { 1244 if (substream->runtime->trigger_master == substream && 1245 snd_pcm_running(substream)) 1246 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1247 return 0; /* unconditonally stop all substreams */ 1248 } 1249 1250 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1251 { 1252 struct snd_pcm_runtime *runtime = substream->runtime; 1253 if (runtime->status->state != state) { 1254 snd_pcm_trigger_tstamp(substream); 1255 runtime->status->state = state; 1256 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1257 } 1258 wake_up(&runtime->sleep); 1259 wake_up(&runtime->tsleep); 1260 } 1261 1262 static const struct action_ops snd_pcm_action_stop = { 1263 .pre_action = snd_pcm_pre_stop, 1264 .do_action = snd_pcm_do_stop, 1265 .post_action = snd_pcm_post_stop 1266 }; 1267 1268 /** 1269 * snd_pcm_stop - try to stop all running streams in the substream group 1270 * @substream: the PCM substream instance 1271 * @state: PCM state after stopping the stream 1272 * 1273 * The state of each stream is then changed to the given state unconditionally. 1274 * 1275 * Return: Zero if successful, or a negative error code. 1276 */ 1277 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1278 { 1279 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1280 } 1281 EXPORT_SYMBOL(snd_pcm_stop); 1282 1283 /** 1284 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1285 * @substream: the PCM substream 1286 * 1287 * After stopping, the state is changed to SETUP. 1288 * Unlike snd_pcm_stop(), this affects only the given stream. 1289 * 1290 * Return: Zero if succesful, or a negative error code. 1291 */ 1292 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1293 { 1294 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1295 SNDRV_PCM_STATE_SETUP); 1296 } 1297 1298 /** 1299 * snd_pcm_stop_xrun - stop the running streams as XRUN 1300 * @substream: the PCM substream instance 1301 * 1302 * This stops the given running substream (and all linked substreams) as XRUN. 1303 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1304 * 1305 * Return: Zero if successful, or a negative error code. 1306 */ 1307 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1308 { 1309 unsigned long flags; 1310 int ret = 0; 1311 1312 snd_pcm_stream_lock_irqsave(substream, flags); 1313 if (snd_pcm_running(substream)) 1314 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1315 snd_pcm_stream_unlock_irqrestore(substream, flags); 1316 return ret; 1317 } 1318 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1319 1320 /* 1321 * pause callbacks 1322 */ 1323 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1324 { 1325 struct snd_pcm_runtime *runtime = substream->runtime; 1326 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1327 return -ENOSYS; 1328 if (push) { 1329 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1330 return -EBADFD; 1331 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1332 return -EBADFD; 1333 runtime->trigger_master = substream; 1334 return 0; 1335 } 1336 1337 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1338 { 1339 if (substream->runtime->trigger_master != substream) 1340 return 0; 1341 /* some drivers might use hw_ptr to recover from the pause - 1342 update the hw_ptr now */ 1343 if (push) 1344 snd_pcm_update_hw_ptr(substream); 1345 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1346 * a delta between the current jiffies, this gives a large enough 1347 * delta, effectively to skip the check once. 1348 */ 1349 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1350 return substream->ops->trigger(substream, 1351 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1352 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1353 } 1354 1355 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1356 { 1357 if (substream->runtime->trigger_master == substream) 1358 substream->ops->trigger(substream, 1359 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1360 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1361 } 1362 1363 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1364 { 1365 struct snd_pcm_runtime *runtime = substream->runtime; 1366 snd_pcm_trigger_tstamp(substream); 1367 if (push) { 1368 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1369 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1370 wake_up(&runtime->sleep); 1371 wake_up(&runtime->tsleep); 1372 } else { 1373 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1374 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1375 } 1376 } 1377 1378 static const struct action_ops snd_pcm_action_pause = { 1379 .pre_action = snd_pcm_pre_pause, 1380 .do_action = snd_pcm_do_pause, 1381 .undo_action = snd_pcm_undo_pause, 1382 .post_action = snd_pcm_post_pause 1383 }; 1384 1385 /* 1386 * Push/release the pause for all linked streams. 1387 */ 1388 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1389 { 1390 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1391 } 1392 1393 #ifdef CONFIG_PM 1394 /* suspend */ 1395 1396 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1397 { 1398 struct snd_pcm_runtime *runtime = substream->runtime; 1399 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1400 return -EBUSY; 1401 runtime->trigger_master = substream; 1402 return 0; 1403 } 1404 1405 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1406 { 1407 struct snd_pcm_runtime *runtime = substream->runtime; 1408 if (runtime->trigger_master != substream) 1409 return 0; 1410 if (! snd_pcm_running(substream)) 1411 return 0; 1412 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1413 return 0; /* suspend unconditionally */ 1414 } 1415 1416 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1417 { 1418 struct snd_pcm_runtime *runtime = substream->runtime; 1419 snd_pcm_trigger_tstamp(substream); 1420 runtime->status->suspended_state = runtime->status->state; 1421 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1422 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1423 wake_up(&runtime->sleep); 1424 wake_up(&runtime->tsleep); 1425 } 1426 1427 static const struct action_ops snd_pcm_action_suspend = { 1428 .pre_action = snd_pcm_pre_suspend, 1429 .do_action = snd_pcm_do_suspend, 1430 .post_action = snd_pcm_post_suspend 1431 }; 1432 1433 /** 1434 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1435 * @substream: the PCM substream 1436 * 1437 * After this call, all streams are changed to SUSPENDED state. 1438 * 1439 * Return: Zero if successful (or @substream is %NULL), or a negative error 1440 * code. 1441 */ 1442 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1443 { 1444 int err; 1445 unsigned long flags; 1446 1447 if (! substream) 1448 return 0; 1449 1450 snd_pcm_stream_lock_irqsave(substream, flags); 1451 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1452 snd_pcm_stream_unlock_irqrestore(substream, flags); 1453 return err; 1454 } 1455 EXPORT_SYMBOL(snd_pcm_suspend); 1456 1457 /** 1458 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1459 * @pcm: the PCM instance 1460 * 1461 * After this call, all streams are changed to SUSPENDED state. 1462 * 1463 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1464 */ 1465 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1466 { 1467 struct snd_pcm_substream *substream; 1468 int stream, err = 0; 1469 1470 if (! pcm) 1471 return 0; 1472 1473 for (stream = 0; stream < 2; stream++) { 1474 for (substream = pcm->streams[stream].substream; 1475 substream; substream = substream->next) { 1476 /* FIXME: the open/close code should lock this as well */ 1477 if (substream->runtime == NULL) 1478 continue; 1479 err = snd_pcm_suspend(substream); 1480 if (err < 0 && err != -EBUSY) 1481 return err; 1482 } 1483 } 1484 return 0; 1485 } 1486 EXPORT_SYMBOL(snd_pcm_suspend_all); 1487 1488 /* resume */ 1489 1490 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1491 { 1492 struct snd_pcm_runtime *runtime = substream->runtime; 1493 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1494 return -ENOSYS; 1495 runtime->trigger_master = substream; 1496 return 0; 1497 } 1498 1499 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1500 { 1501 struct snd_pcm_runtime *runtime = substream->runtime; 1502 if (runtime->trigger_master != substream) 1503 return 0; 1504 /* DMA not running previously? */ 1505 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1506 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1507 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1508 return 0; 1509 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1510 } 1511 1512 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1513 { 1514 if (substream->runtime->trigger_master == substream && 1515 snd_pcm_running(substream)) 1516 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1517 } 1518 1519 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1520 { 1521 struct snd_pcm_runtime *runtime = substream->runtime; 1522 snd_pcm_trigger_tstamp(substream); 1523 runtime->status->state = runtime->status->suspended_state; 1524 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1525 } 1526 1527 static const struct action_ops snd_pcm_action_resume = { 1528 .pre_action = snd_pcm_pre_resume, 1529 .do_action = snd_pcm_do_resume, 1530 .undo_action = snd_pcm_undo_resume, 1531 .post_action = snd_pcm_post_resume 1532 }; 1533 1534 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1535 { 1536 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1537 } 1538 1539 #else 1540 1541 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1542 { 1543 return -ENOSYS; 1544 } 1545 1546 #endif /* CONFIG_PM */ 1547 1548 /* 1549 * xrun ioctl 1550 * 1551 * Change the RUNNING stream(s) to XRUN state. 1552 */ 1553 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1554 { 1555 struct snd_pcm_runtime *runtime = substream->runtime; 1556 int result; 1557 1558 snd_pcm_stream_lock_irq(substream); 1559 switch (runtime->status->state) { 1560 case SNDRV_PCM_STATE_XRUN: 1561 result = 0; /* already there */ 1562 break; 1563 case SNDRV_PCM_STATE_RUNNING: 1564 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1565 break; 1566 default: 1567 result = -EBADFD; 1568 } 1569 snd_pcm_stream_unlock_irq(substream); 1570 return result; 1571 } 1572 1573 /* 1574 * reset ioctl 1575 */ 1576 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1577 { 1578 struct snd_pcm_runtime *runtime = substream->runtime; 1579 switch (runtime->status->state) { 1580 case SNDRV_PCM_STATE_RUNNING: 1581 case SNDRV_PCM_STATE_PREPARED: 1582 case SNDRV_PCM_STATE_PAUSED: 1583 case SNDRV_PCM_STATE_SUSPENDED: 1584 return 0; 1585 default: 1586 return -EBADFD; 1587 } 1588 } 1589 1590 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1591 { 1592 struct snd_pcm_runtime *runtime = substream->runtime; 1593 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1594 if (err < 0) 1595 return err; 1596 runtime->hw_ptr_base = 0; 1597 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1598 runtime->status->hw_ptr % runtime->period_size; 1599 runtime->silence_start = runtime->status->hw_ptr; 1600 runtime->silence_filled = 0; 1601 return 0; 1602 } 1603 1604 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1605 { 1606 struct snd_pcm_runtime *runtime = substream->runtime; 1607 runtime->control->appl_ptr = runtime->status->hw_ptr; 1608 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1609 runtime->silence_size > 0) 1610 snd_pcm_playback_silence(substream, ULONG_MAX); 1611 } 1612 1613 static const struct action_ops snd_pcm_action_reset = { 1614 .pre_action = snd_pcm_pre_reset, 1615 .do_action = snd_pcm_do_reset, 1616 .post_action = snd_pcm_post_reset 1617 }; 1618 1619 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1620 { 1621 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1622 } 1623 1624 /* 1625 * prepare ioctl 1626 */ 1627 /* we use the second argument for updating f_flags */ 1628 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1629 int f_flags) 1630 { 1631 struct snd_pcm_runtime *runtime = substream->runtime; 1632 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1633 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1634 return -EBADFD; 1635 if (snd_pcm_running(substream)) 1636 return -EBUSY; 1637 substream->f_flags = f_flags; 1638 return 0; 1639 } 1640 1641 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1642 { 1643 int err; 1644 err = substream->ops->prepare(substream); 1645 if (err < 0) 1646 return err; 1647 return snd_pcm_do_reset(substream, 0); 1648 } 1649 1650 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1651 { 1652 struct snd_pcm_runtime *runtime = substream->runtime; 1653 runtime->control->appl_ptr = runtime->status->hw_ptr; 1654 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1655 } 1656 1657 static const struct action_ops snd_pcm_action_prepare = { 1658 .pre_action = snd_pcm_pre_prepare, 1659 .do_action = snd_pcm_do_prepare, 1660 .post_action = snd_pcm_post_prepare 1661 }; 1662 1663 /** 1664 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1665 * @substream: the PCM substream instance 1666 * @file: file to refer f_flags 1667 * 1668 * Return: Zero if successful, or a negative error code. 1669 */ 1670 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1671 struct file *file) 1672 { 1673 int f_flags; 1674 1675 if (file) 1676 f_flags = file->f_flags; 1677 else 1678 f_flags = substream->f_flags; 1679 1680 snd_pcm_stream_lock_irq(substream); 1681 switch (substream->runtime->status->state) { 1682 case SNDRV_PCM_STATE_PAUSED: 1683 snd_pcm_pause(substream, 0); 1684 /* fallthru */ 1685 case SNDRV_PCM_STATE_SUSPENDED: 1686 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1687 break; 1688 } 1689 snd_pcm_stream_unlock_irq(substream); 1690 1691 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1692 substream, f_flags); 1693 } 1694 1695 /* 1696 * drain ioctl 1697 */ 1698 1699 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1700 { 1701 struct snd_pcm_runtime *runtime = substream->runtime; 1702 switch (runtime->status->state) { 1703 case SNDRV_PCM_STATE_OPEN: 1704 case SNDRV_PCM_STATE_DISCONNECTED: 1705 case SNDRV_PCM_STATE_SUSPENDED: 1706 return -EBADFD; 1707 } 1708 runtime->trigger_master = substream; 1709 return 0; 1710 } 1711 1712 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1713 { 1714 struct snd_pcm_runtime *runtime = substream->runtime; 1715 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1716 switch (runtime->status->state) { 1717 case SNDRV_PCM_STATE_PREPARED: 1718 /* start playback stream if possible */ 1719 if (! snd_pcm_playback_empty(substream)) { 1720 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1721 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1722 } else { 1723 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1724 } 1725 break; 1726 case SNDRV_PCM_STATE_RUNNING: 1727 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1728 break; 1729 case SNDRV_PCM_STATE_XRUN: 1730 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1731 break; 1732 default: 1733 break; 1734 } 1735 } else { 1736 /* stop running stream */ 1737 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1738 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1739 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1740 snd_pcm_do_stop(substream, new_state); 1741 snd_pcm_post_stop(substream, new_state); 1742 } 1743 } 1744 1745 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1746 runtime->trigger_master == substream && 1747 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1748 return substream->ops->trigger(substream, 1749 SNDRV_PCM_TRIGGER_DRAIN); 1750 1751 return 0; 1752 } 1753 1754 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1755 { 1756 } 1757 1758 static const struct action_ops snd_pcm_action_drain_init = { 1759 .pre_action = snd_pcm_pre_drain_init, 1760 .do_action = snd_pcm_do_drain_init, 1761 .post_action = snd_pcm_post_drain_init 1762 }; 1763 1764 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1765 1766 /* 1767 * Drain the stream(s). 1768 * When the substream is linked, sync until the draining of all playback streams 1769 * is finished. 1770 * After this call, all streams are supposed to be either SETUP or DRAINING 1771 * (capture only) state. 1772 */ 1773 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1774 struct file *file) 1775 { 1776 struct snd_card *card; 1777 struct snd_pcm_runtime *runtime; 1778 struct snd_pcm_substream *s; 1779 wait_queue_entry_t wait; 1780 int result = 0; 1781 int nonblock = 0; 1782 1783 card = substream->pcm->card; 1784 runtime = substream->runtime; 1785 1786 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1787 return -EBADFD; 1788 1789 if (file) { 1790 if (file->f_flags & O_NONBLOCK) 1791 nonblock = 1; 1792 } else if (substream->f_flags & O_NONBLOCK) 1793 nonblock = 1; 1794 1795 down_read(&snd_pcm_link_rwsem); 1796 snd_pcm_stream_lock_irq(substream); 1797 /* resume pause */ 1798 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1799 snd_pcm_pause(substream, 0); 1800 1801 /* pre-start/stop - all running streams are changed to DRAINING state */ 1802 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1803 if (result < 0) 1804 goto unlock; 1805 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1806 if (nonblock) { 1807 result = -EAGAIN; 1808 goto unlock; 1809 } 1810 1811 for (;;) { 1812 long tout; 1813 struct snd_pcm_runtime *to_check; 1814 if (signal_pending(current)) { 1815 result = -ERESTARTSYS; 1816 break; 1817 } 1818 /* find a substream to drain */ 1819 to_check = NULL; 1820 snd_pcm_group_for_each_entry(s, substream) { 1821 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1822 continue; 1823 runtime = s->runtime; 1824 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1825 to_check = runtime; 1826 break; 1827 } 1828 } 1829 if (!to_check) 1830 break; /* all drained */ 1831 init_waitqueue_entry(&wait, current); 1832 add_wait_queue(&to_check->sleep, &wait); 1833 snd_pcm_stream_unlock_irq(substream); 1834 up_read(&snd_pcm_link_rwsem); 1835 snd_power_unlock(card); 1836 if (runtime->no_period_wakeup) 1837 tout = MAX_SCHEDULE_TIMEOUT; 1838 else { 1839 tout = 10; 1840 if (runtime->rate) { 1841 long t = runtime->period_size * 2 / runtime->rate; 1842 tout = max(t, tout); 1843 } 1844 tout = msecs_to_jiffies(tout * 1000); 1845 } 1846 tout = schedule_timeout_interruptible(tout); 1847 snd_power_lock(card); 1848 down_read(&snd_pcm_link_rwsem); 1849 snd_pcm_stream_lock_irq(substream); 1850 remove_wait_queue(&to_check->sleep, &wait); 1851 if (card->shutdown) { 1852 result = -ENODEV; 1853 break; 1854 } 1855 if (tout == 0) { 1856 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1857 result = -ESTRPIPE; 1858 else { 1859 dev_dbg(substream->pcm->card->dev, 1860 "playback drain error (DMA or IRQ trouble?)\n"); 1861 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1862 result = -EIO; 1863 } 1864 break; 1865 } 1866 } 1867 1868 unlock: 1869 snd_pcm_stream_unlock_irq(substream); 1870 up_read(&snd_pcm_link_rwsem); 1871 1872 return result; 1873 } 1874 1875 /* 1876 * drop ioctl 1877 * 1878 * Immediately put all linked substreams into SETUP state. 1879 */ 1880 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1881 { 1882 struct snd_pcm_runtime *runtime; 1883 int result = 0; 1884 1885 if (PCM_RUNTIME_CHECK(substream)) 1886 return -ENXIO; 1887 runtime = substream->runtime; 1888 1889 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1890 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1891 return -EBADFD; 1892 1893 snd_pcm_stream_lock_irq(substream); 1894 /* resume pause */ 1895 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1896 snd_pcm_pause(substream, 0); 1897 1898 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1899 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1900 snd_pcm_stream_unlock_irq(substream); 1901 1902 return result; 1903 } 1904 1905 1906 static bool is_pcm_file(struct file *file) 1907 { 1908 struct inode *inode = file_inode(file); 1909 unsigned int minor; 1910 1911 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1912 return false; 1913 minor = iminor(inode); 1914 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1915 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1916 } 1917 1918 /* 1919 * PCM link handling 1920 */ 1921 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1922 { 1923 int res = 0; 1924 struct snd_pcm_file *pcm_file; 1925 struct snd_pcm_substream *substream1; 1926 struct snd_pcm_group *group; 1927 struct fd f = fdget(fd); 1928 1929 if (!f.file) 1930 return -EBADFD; 1931 if (!is_pcm_file(f.file)) { 1932 res = -EBADFD; 1933 goto _badf; 1934 } 1935 pcm_file = f.file->private_data; 1936 substream1 = pcm_file->substream; 1937 group = kmalloc(sizeof(*group), GFP_KERNEL); 1938 if (!group) { 1939 res = -ENOMEM; 1940 goto _nolock; 1941 } 1942 down_write_nonblock(&snd_pcm_link_rwsem); 1943 write_lock_irq(&snd_pcm_link_rwlock); 1944 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1945 substream->runtime->status->state != substream1->runtime->status->state || 1946 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1947 res = -EBADFD; 1948 goto _end; 1949 } 1950 if (snd_pcm_stream_linked(substream1)) { 1951 res = -EALREADY; 1952 goto _end; 1953 } 1954 if (!snd_pcm_stream_linked(substream)) { 1955 substream->group = group; 1956 group = NULL; 1957 spin_lock_init(&substream->group->lock); 1958 mutex_init(&substream->group->mutex); 1959 INIT_LIST_HEAD(&substream->group->substreams); 1960 list_add_tail(&substream->link_list, &substream->group->substreams); 1961 substream->group->count = 1; 1962 } 1963 list_add_tail(&substream1->link_list, &substream->group->substreams); 1964 substream->group->count++; 1965 substream1->group = substream->group; 1966 _end: 1967 write_unlock_irq(&snd_pcm_link_rwlock); 1968 up_write(&snd_pcm_link_rwsem); 1969 _nolock: 1970 snd_card_unref(substream1->pcm->card); 1971 kfree(group); 1972 _badf: 1973 fdput(f); 1974 return res; 1975 } 1976 1977 static void relink_to_local(struct snd_pcm_substream *substream) 1978 { 1979 substream->group = &substream->self_group; 1980 INIT_LIST_HEAD(&substream->self_group.substreams); 1981 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1982 } 1983 1984 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1985 { 1986 struct snd_pcm_substream *s; 1987 int res = 0; 1988 1989 down_write_nonblock(&snd_pcm_link_rwsem); 1990 write_lock_irq(&snd_pcm_link_rwlock); 1991 if (!snd_pcm_stream_linked(substream)) { 1992 res = -EALREADY; 1993 goto _end; 1994 } 1995 list_del(&substream->link_list); 1996 substream->group->count--; 1997 if (substream->group->count == 1) { /* detach the last stream, too */ 1998 snd_pcm_group_for_each_entry(s, substream) { 1999 relink_to_local(s); 2000 break; 2001 } 2002 kfree(substream->group); 2003 } 2004 relink_to_local(substream); 2005 _end: 2006 write_unlock_irq(&snd_pcm_link_rwlock); 2007 up_write(&snd_pcm_link_rwsem); 2008 return res; 2009 } 2010 2011 /* 2012 * hw configurator 2013 */ 2014 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2015 struct snd_pcm_hw_rule *rule) 2016 { 2017 struct snd_interval t; 2018 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2019 hw_param_interval_c(params, rule->deps[1]), &t); 2020 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2021 } 2022 2023 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2024 struct snd_pcm_hw_rule *rule) 2025 { 2026 struct snd_interval t; 2027 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2028 hw_param_interval_c(params, rule->deps[1]), &t); 2029 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2030 } 2031 2032 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2033 struct snd_pcm_hw_rule *rule) 2034 { 2035 struct snd_interval t; 2036 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2037 hw_param_interval_c(params, rule->deps[1]), 2038 (unsigned long) rule->private, &t); 2039 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2040 } 2041 2042 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2043 struct snd_pcm_hw_rule *rule) 2044 { 2045 struct snd_interval t; 2046 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2047 (unsigned long) rule->private, 2048 hw_param_interval_c(params, rule->deps[1]), &t); 2049 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2050 } 2051 2052 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2053 struct snd_pcm_hw_rule *rule) 2054 { 2055 unsigned int k; 2056 const struct snd_interval *i = 2057 hw_param_interval_c(params, rule->deps[0]); 2058 struct snd_mask m; 2059 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2060 snd_mask_any(&m); 2061 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2062 int bits; 2063 if (! snd_mask_test(mask, k)) 2064 continue; 2065 bits = snd_pcm_format_physical_width(k); 2066 if (bits <= 0) 2067 continue; /* ignore invalid formats */ 2068 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2069 snd_mask_reset(&m, k); 2070 } 2071 return snd_mask_refine(mask, &m); 2072 } 2073 2074 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2075 struct snd_pcm_hw_rule *rule) 2076 { 2077 struct snd_interval t; 2078 unsigned int k; 2079 t.min = UINT_MAX; 2080 t.max = 0; 2081 t.openmin = 0; 2082 t.openmax = 0; 2083 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 2084 int bits; 2085 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2086 continue; 2087 bits = snd_pcm_format_physical_width(k); 2088 if (bits <= 0) 2089 continue; /* ignore invalid formats */ 2090 if (t.min > (unsigned)bits) 2091 t.min = bits; 2092 if (t.max < (unsigned)bits) 2093 t.max = bits; 2094 } 2095 t.integer = 1; 2096 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2097 } 2098 2099 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2100 #error "Change this table" 2101 #endif 2102 2103 static const unsigned int rates[] = { 2104 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2105 48000, 64000, 88200, 96000, 176400, 192000 2106 }; 2107 2108 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2109 .count = ARRAY_SIZE(rates), 2110 .list = rates, 2111 }; 2112 2113 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2114 struct snd_pcm_hw_rule *rule) 2115 { 2116 struct snd_pcm_hardware *hw = rule->private; 2117 return snd_interval_list(hw_param_interval(params, rule->var), 2118 snd_pcm_known_rates.count, 2119 snd_pcm_known_rates.list, hw->rates); 2120 } 2121 2122 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2123 struct snd_pcm_hw_rule *rule) 2124 { 2125 struct snd_interval t; 2126 struct snd_pcm_substream *substream = rule->private; 2127 t.min = 0; 2128 t.max = substream->buffer_bytes_max; 2129 t.openmin = 0; 2130 t.openmax = 0; 2131 t.integer = 1; 2132 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2133 } 2134 2135 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2136 { 2137 struct snd_pcm_runtime *runtime = substream->runtime; 2138 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2139 int k, err; 2140 2141 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2142 snd_mask_any(constrs_mask(constrs, k)); 2143 } 2144 2145 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2146 snd_interval_any(constrs_interval(constrs, k)); 2147 } 2148 2149 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2150 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2151 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2152 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2153 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2154 2155 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2156 snd_pcm_hw_rule_format, NULL, 2157 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2158 if (err < 0) 2159 return err; 2160 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2161 snd_pcm_hw_rule_sample_bits, NULL, 2162 SNDRV_PCM_HW_PARAM_FORMAT, 2163 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2164 if (err < 0) 2165 return err; 2166 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2167 snd_pcm_hw_rule_div, NULL, 2168 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2169 if (err < 0) 2170 return err; 2171 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2172 snd_pcm_hw_rule_mul, NULL, 2173 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2174 if (err < 0) 2175 return err; 2176 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2177 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2178 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2179 if (err < 0) 2180 return err; 2181 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2182 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2183 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2184 if (err < 0) 2185 return err; 2186 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2187 snd_pcm_hw_rule_div, NULL, 2188 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2189 if (err < 0) 2190 return err; 2191 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2192 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2193 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2194 if (err < 0) 2195 return err; 2196 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2197 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2198 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2199 if (err < 0) 2200 return err; 2201 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2202 snd_pcm_hw_rule_div, NULL, 2203 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2204 if (err < 0) 2205 return err; 2206 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2207 snd_pcm_hw_rule_div, NULL, 2208 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2209 if (err < 0) 2210 return err; 2211 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2212 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2213 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2214 if (err < 0) 2215 return err; 2216 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2217 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2218 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2219 if (err < 0) 2220 return err; 2221 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2222 snd_pcm_hw_rule_mul, NULL, 2223 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2224 if (err < 0) 2225 return err; 2226 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2227 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2228 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2229 if (err < 0) 2230 return err; 2231 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2232 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2233 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2234 if (err < 0) 2235 return err; 2236 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2237 snd_pcm_hw_rule_muldivk, (void*) 8, 2238 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2239 if (err < 0) 2240 return err; 2241 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2242 snd_pcm_hw_rule_muldivk, (void*) 8, 2243 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2244 if (err < 0) 2245 return err; 2246 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2247 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2248 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2249 if (err < 0) 2250 return err; 2251 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2252 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2253 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2254 if (err < 0) 2255 return err; 2256 return 0; 2257 } 2258 2259 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2260 { 2261 struct snd_pcm_runtime *runtime = substream->runtime; 2262 struct snd_pcm_hardware *hw = &runtime->hw; 2263 int err; 2264 unsigned int mask = 0; 2265 2266 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2267 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2268 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2269 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2270 if (hw_support_mmap(substream)) { 2271 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2272 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2273 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2274 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2275 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2276 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2277 } 2278 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2279 if (err < 0) 2280 return err; 2281 2282 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2283 if (err < 0) 2284 return err; 2285 2286 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2287 if (err < 0) 2288 return err; 2289 2290 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2291 hw->channels_min, hw->channels_max); 2292 if (err < 0) 2293 return err; 2294 2295 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2296 hw->rate_min, hw->rate_max); 2297 if (err < 0) 2298 return err; 2299 2300 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2301 hw->period_bytes_min, hw->period_bytes_max); 2302 if (err < 0) 2303 return err; 2304 2305 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2306 hw->periods_min, hw->periods_max); 2307 if (err < 0) 2308 return err; 2309 2310 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2311 hw->period_bytes_min, hw->buffer_bytes_max); 2312 if (err < 0) 2313 return err; 2314 2315 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2316 snd_pcm_hw_rule_buffer_bytes_max, substream, 2317 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2318 if (err < 0) 2319 return err; 2320 2321 /* FIXME: remove */ 2322 if (runtime->dma_bytes) { 2323 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2324 if (err < 0) 2325 return err; 2326 } 2327 2328 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2329 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2330 snd_pcm_hw_rule_rate, hw, 2331 SNDRV_PCM_HW_PARAM_RATE, -1); 2332 if (err < 0) 2333 return err; 2334 } 2335 2336 /* FIXME: this belong to lowlevel */ 2337 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2338 2339 return 0; 2340 } 2341 2342 static void pcm_release_private(struct snd_pcm_substream *substream) 2343 { 2344 snd_pcm_unlink(substream); 2345 } 2346 2347 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2348 { 2349 substream->ref_count--; 2350 if (substream->ref_count > 0) 2351 return; 2352 2353 snd_pcm_drop(substream); 2354 if (substream->hw_opened) { 2355 if (substream->ops->hw_free && 2356 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2357 substream->ops->hw_free(substream); 2358 substream->ops->close(substream); 2359 substream->hw_opened = 0; 2360 } 2361 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2362 pm_qos_remove_request(&substream->latency_pm_qos_req); 2363 if (substream->pcm_release) { 2364 substream->pcm_release(substream); 2365 substream->pcm_release = NULL; 2366 } 2367 snd_pcm_detach_substream(substream); 2368 } 2369 EXPORT_SYMBOL(snd_pcm_release_substream); 2370 2371 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2372 struct file *file, 2373 struct snd_pcm_substream **rsubstream) 2374 { 2375 struct snd_pcm_substream *substream; 2376 int err; 2377 2378 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2379 if (err < 0) 2380 return err; 2381 if (substream->ref_count > 1) { 2382 *rsubstream = substream; 2383 return 0; 2384 } 2385 2386 err = snd_pcm_hw_constraints_init(substream); 2387 if (err < 0) { 2388 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2389 goto error; 2390 } 2391 2392 if ((err = substream->ops->open(substream)) < 0) 2393 goto error; 2394 2395 substream->hw_opened = 1; 2396 2397 err = snd_pcm_hw_constraints_complete(substream); 2398 if (err < 0) { 2399 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2400 goto error; 2401 } 2402 2403 *rsubstream = substream; 2404 return 0; 2405 2406 error: 2407 snd_pcm_release_substream(substream); 2408 return err; 2409 } 2410 EXPORT_SYMBOL(snd_pcm_open_substream); 2411 2412 static int snd_pcm_open_file(struct file *file, 2413 struct snd_pcm *pcm, 2414 int stream) 2415 { 2416 struct snd_pcm_file *pcm_file; 2417 struct snd_pcm_substream *substream; 2418 int err; 2419 2420 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2421 if (err < 0) 2422 return err; 2423 2424 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2425 if (pcm_file == NULL) { 2426 snd_pcm_release_substream(substream); 2427 return -ENOMEM; 2428 } 2429 pcm_file->substream = substream; 2430 if (substream->ref_count == 1) { 2431 substream->file = pcm_file; 2432 substream->pcm_release = pcm_release_private; 2433 } 2434 file->private_data = pcm_file; 2435 2436 return 0; 2437 } 2438 2439 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2440 { 2441 struct snd_pcm *pcm; 2442 int err = nonseekable_open(inode, file); 2443 if (err < 0) 2444 return err; 2445 pcm = snd_lookup_minor_data(iminor(inode), 2446 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2447 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2448 if (pcm) 2449 snd_card_unref(pcm->card); 2450 return err; 2451 } 2452 2453 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2454 { 2455 struct snd_pcm *pcm; 2456 int err = nonseekable_open(inode, file); 2457 if (err < 0) 2458 return err; 2459 pcm = snd_lookup_minor_data(iminor(inode), 2460 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2461 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2462 if (pcm) 2463 snd_card_unref(pcm->card); 2464 return err; 2465 } 2466 2467 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2468 { 2469 int err; 2470 wait_queue_entry_t wait; 2471 2472 if (pcm == NULL) { 2473 err = -ENODEV; 2474 goto __error1; 2475 } 2476 err = snd_card_file_add(pcm->card, file); 2477 if (err < 0) 2478 goto __error1; 2479 if (!try_module_get(pcm->card->module)) { 2480 err = -EFAULT; 2481 goto __error2; 2482 } 2483 init_waitqueue_entry(&wait, current); 2484 add_wait_queue(&pcm->open_wait, &wait); 2485 mutex_lock(&pcm->open_mutex); 2486 while (1) { 2487 err = snd_pcm_open_file(file, pcm, stream); 2488 if (err >= 0) 2489 break; 2490 if (err == -EAGAIN) { 2491 if (file->f_flags & O_NONBLOCK) { 2492 err = -EBUSY; 2493 break; 2494 } 2495 } else 2496 break; 2497 set_current_state(TASK_INTERRUPTIBLE); 2498 mutex_unlock(&pcm->open_mutex); 2499 schedule(); 2500 mutex_lock(&pcm->open_mutex); 2501 if (pcm->card->shutdown) { 2502 err = -ENODEV; 2503 break; 2504 } 2505 if (signal_pending(current)) { 2506 err = -ERESTARTSYS; 2507 break; 2508 } 2509 } 2510 remove_wait_queue(&pcm->open_wait, &wait); 2511 mutex_unlock(&pcm->open_mutex); 2512 if (err < 0) 2513 goto __error; 2514 return err; 2515 2516 __error: 2517 module_put(pcm->card->module); 2518 __error2: 2519 snd_card_file_remove(pcm->card, file); 2520 __error1: 2521 return err; 2522 } 2523 2524 static int snd_pcm_release(struct inode *inode, struct file *file) 2525 { 2526 struct snd_pcm *pcm; 2527 struct snd_pcm_substream *substream; 2528 struct snd_pcm_file *pcm_file; 2529 2530 pcm_file = file->private_data; 2531 substream = pcm_file->substream; 2532 if (snd_BUG_ON(!substream)) 2533 return -ENXIO; 2534 pcm = substream->pcm; 2535 mutex_lock(&pcm->open_mutex); 2536 snd_pcm_release_substream(substream); 2537 kfree(pcm_file); 2538 mutex_unlock(&pcm->open_mutex); 2539 wake_up(&pcm->open_wait); 2540 module_put(pcm->card->module); 2541 snd_card_file_remove(pcm->card, file); 2542 return 0; 2543 } 2544 2545 /* check and update PCM state; return 0 or a negative error 2546 * call this inside PCM lock 2547 */ 2548 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2549 { 2550 switch (substream->runtime->status->state) { 2551 case SNDRV_PCM_STATE_DRAINING: 2552 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2553 return -EBADFD; 2554 /* Fall through */ 2555 case SNDRV_PCM_STATE_RUNNING: 2556 return snd_pcm_update_hw_ptr(substream); 2557 case SNDRV_PCM_STATE_PREPARED: 2558 case SNDRV_PCM_STATE_PAUSED: 2559 return 0; 2560 case SNDRV_PCM_STATE_SUSPENDED: 2561 return -ESTRPIPE; 2562 case SNDRV_PCM_STATE_XRUN: 2563 return -EPIPE; 2564 default: 2565 return -EBADFD; 2566 } 2567 } 2568 2569 /* increase the appl_ptr; returns the processed frames or a negative error */ 2570 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2571 snd_pcm_uframes_t frames, 2572 snd_pcm_sframes_t avail) 2573 { 2574 struct snd_pcm_runtime *runtime = substream->runtime; 2575 snd_pcm_sframes_t appl_ptr; 2576 int ret; 2577 2578 if (avail <= 0) 2579 return 0; 2580 if (frames > (snd_pcm_uframes_t)avail) 2581 frames = avail; 2582 appl_ptr = runtime->control->appl_ptr + frames; 2583 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2584 appl_ptr -= runtime->boundary; 2585 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2586 return ret < 0 ? ret : frames; 2587 } 2588 2589 /* decrease the appl_ptr; returns the processed frames or a negative error */ 2590 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2591 snd_pcm_uframes_t frames, 2592 snd_pcm_sframes_t avail) 2593 { 2594 struct snd_pcm_runtime *runtime = substream->runtime; 2595 snd_pcm_sframes_t appl_ptr; 2596 int ret; 2597 2598 if (avail <= 0) 2599 return 0; 2600 if (frames > (snd_pcm_uframes_t)avail) 2601 frames = avail; 2602 appl_ptr = runtime->control->appl_ptr - frames; 2603 if (appl_ptr < 0) 2604 appl_ptr += runtime->boundary; 2605 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2606 return ret < 0 ? ret : frames; 2607 } 2608 2609 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2610 snd_pcm_uframes_t frames) 2611 { 2612 struct snd_pcm_runtime *runtime = substream->runtime; 2613 snd_pcm_sframes_t ret; 2614 2615 if (frames == 0) 2616 return 0; 2617 2618 snd_pcm_stream_lock_irq(substream); 2619 ret = do_pcm_hwsync(substream); 2620 if (!ret) 2621 ret = rewind_appl_ptr(substream, frames, 2622 snd_pcm_playback_hw_avail(runtime)); 2623 snd_pcm_stream_unlock_irq(substream); 2624 return ret; 2625 } 2626 2627 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2628 snd_pcm_uframes_t frames) 2629 { 2630 struct snd_pcm_runtime *runtime = substream->runtime; 2631 snd_pcm_sframes_t ret; 2632 2633 if (frames == 0) 2634 return 0; 2635 2636 snd_pcm_stream_lock_irq(substream); 2637 ret = do_pcm_hwsync(substream); 2638 if (!ret) 2639 ret = rewind_appl_ptr(substream, frames, 2640 snd_pcm_capture_hw_avail(runtime)); 2641 snd_pcm_stream_unlock_irq(substream); 2642 return ret; 2643 } 2644 2645 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2646 snd_pcm_uframes_t frames) 2647 { 2648 struct snd_pcm_runtime *runtime = substream->runtime; 2649 snd_pcm_sframes_t ret; 2650 2651 if (frames == 0) 2652 return 0; 2653 2654 snd_pcm_stream_lock_irq(substream); 2655 ret = do_pcm_hwsync(substream); 2656 if (!ret) 2657 ret = forward_appl_ptr(substream, frames, 2658 snd_pcm_playback_avail(runtime)); 2659 snd_pcm_stream_unlock_irq(substream); 2660 return ret; 2661 } 2662 2663 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2664 snd_pcm_uframes_t frames) 2665 { 2666 struct snd_pcm_runtime *runtime = substream->runtime; 2667 snd_pcm_sframes_t ret; 2668 2669 if (frames == 0) 2670 return 0; 2671 2672 snd_pcm_stream_lock_irq(substream); 2673 ret = do_pcm_hwsync(substream); 2674 if (!ret) 2675 ret = forward_appl_ptr(substream, frames, 2676 snd_pcm_capture_avail(runtime)); 2677 snd_pcm_stream_unlock_irq(substream); 2678 return ret; 2679 } 2680 2681 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2682 { 2683 int err; 2684 2685 snd_pcm_stream_lock_irq(substream); 2686 err = do_pcm_hwsync(substream); 2687 snd_pcm_stream_unlock_irq(substream); 2688 return err; 2689 } 2690 2691 static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream) 2692 { 2693 struct snd_pcm_runtime *runtime = substream->runtime; 2694 int err; 2695 snd_pcm_sframes_t n = 0; 2696 2697 snd_pcm_stream_lock_irq(substream); 2698 err = do_pcm_hwsync(substream); 2699 if (!err) { 2700 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2701 n = snd_pcm_playback_hw_avail(runtime); 2702 else 2703 n = snd_pcm_capture_avail(runtime); 2704 n += runtime->delay; 2705 } 2706 snd_pcm_stream_unlock_irq(substream); 2707 return err < 0 ? err : n; 2708 } 2709 2710 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2711 struct snd_pcm_sync_ptr __user *_sync_ptr) 2712 { 2713 struct snd_pcm_runtime *runtime = substream->runtime; 2714 struct snd_pcm_sync_ptr sync_ptr; 2715 volatile struct snd_pcm_mmap_status *status; 2716 volatile struct snd_pcm_mmap_control *control; 2717 int err; 2718 2719 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2720 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2721 return -EFAULT; 2722 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2723 return -EFAULT; 2724 status = runtime->status; 2725 control = runtime->control; 2726 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2727 err = snd_pcm_hwsync(substream); 2728 if (err < 0) 2729 return err; 2730 } 2731 snd_pcm_stream_lock_irq(substream); 2732 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2733 err = pcm_lib_apply_appl_ptr(substream, 2734 sync_ptr.c.control.appl_ptr); 2735 if (err < 0) { 2736 snd_pcm_stream_unlock_irq(substream); 2737 return err; 2738 } 2739 } else { 2740 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2741 } 2742 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2743 control->avail_min = sync_ptr.c.control.avail_min; 2744 else 2745 sync_ptr.c.control.avail_min = control->avail_min; 2746 sync_ptr.s.status.state = status->state; 2747 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2748 sync_ptr.s.status.tstamp = status->tstamp; 2749 sync_ptr.s.status.suspended_state = status->suspended_state; 2750 snd_pcm_stream_unlock_irq(substream); 2751 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2752 return -EFAULT; 2753 return 0; 2754 } 2755 2756 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2757 { 2758 struct snd_pcm_runtime *runtime = substream->runtime; 2759 int arg; 2760 2761 if (get_user(arg, _arg)) 2762 return -EFAULT; 2763 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2764 return -EINVAL; 2765 runtime->tstamp_type = arg; 2766 return 0; 2767 } 2768 2769 static int snd_pcm_common_ioctl(struct file *file, 2770 struct snd_pcm_substream *substream, 2771 unsigned int cmd, void __user *arg) 2772 { 2773 struct snd_pcm_file *pcm_file = file->private_data; 2774 2775 switch (cmd) { 2776 case SNDRV_PCM_IOCTL_PVERSION: 2777 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2778 case SNDRV_PCM_IOCTL_INFO: 2779 return snd_pcm_info_user(substream, arg); 2780 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2781 return 0; 2782 case SNDRV_PCM_IOCTL_TTSTAMP: 2783 return snd_pcm_tstamp(substream, arg); 2784 case SNDRV_PCM_IOCTL_USER_PVERSION: 2785 if (get_user(pcm_file->user_pversion, 2786 (unsigned int __user *)arg)) 2787 return -EFAULT; 2788 return 0; 2789 case SNDRV_PCM_IOCTL_HW_REFINE: 2790 return snd_pcm_hw_refine_user(substream, arg); 2791 case SNDRV_PCM_IOCTL_HW_PARAMS: 2792 return snd_pcm_hw_params_user(substream, arg); 2793 case SNDRV_PCM_IOCTL_HW_FREE: 2794 return snd_pcm_hw_free(substream); 2795 case SNDRV_PCM_IOCTL_SW_PARAMS: 2796 return snd_pcm_sw_params_user(substream, arg); 2797 case SNDRV_PCM_IOCTL_STATUS: 2798 return snd_pcm_status_user(substream, arg, false); 2799 case SNDRV_PCM_IOCTL_STATUS_EXT: 2800 return snd_pcm_status_user(substream, arg, true); 2801 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2802 return snd_pcm_channel_info_user(substream, arg); 2803 case SNDRV_PCM_IOCTL_PREPARE: 2804 return snd_pcm_prepare(substream, file); 2805 case SNDRV_PCM_IOCTL_RESET: 2806 return snd_pcm_reset(substream); 2807 case SNDRV_PCM_IOCTL_START: 2808 return snd_pcm_start_lock_irq(substream); 2809 case SNDRV_PCM_IOCTL_LINK: 2810 return snd_pcm_link(substream, (int)(unsigned long) arg); 2811 case SNDRV_PCM_IOCTL_UNLINK: 2812 return snd_pcm_unlink(substream); 2813 case SNDRV_PCM_IOCTL_RESUME: 2814 return snd_pcm_resume(substream); 2815 case SNDRV_PCM_IOCTL_XRUN: 2816 return snd_pcm_xrun(substream); 2817 case SNDRV_PCM_IOCTL_HWSYNC: 2818 return snd_pcm_hwsync(substream); 2819 case SNDRV_PCM_IOCTL_DELAY: 2820 { 2821 snd_pcm_sframes_t delay = snd_pcm_delay(substream); 2822 snd_pcm_sframes_t __user *res = arg; 2823 2824 if (delay < 0) 2825 return delay; 2826 if (put_user(delay, res)) 2827 return -EFAULT; 2828 return 0; 2829 } 2830 case SNDRV_PCM_IOCTL_SYNC_PTR: 2831 return snd_pcm_sync_ptr(substream, arg); 2832 #ifdef CONFIG_SND_SUPPORT_OLD_API 2833 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2834 return snd_pcm_hw_refine_old_user(substream, arg); 2835 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2836 return snd_pcm_hw_params_old_user(substream, arg); 2837 #endif 2838 case SNDRV_PCM_IOCTL_DRAIN: 2839 return snd_pcm_drain(substream, file); 2840 case SNDRV_PCM_IOCTL_DROP: 2841 return snd_pcm_drop(substream); 2842 case SNDRV_PCM_IOCTL_PAUSE: 2843 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, 2844 substream, 2845 (int)(unsigned long)arg); 2846 } 2847 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2848 return -ENOTTY; 2849 } 2850 2851 static int snd_pcm_common_ioctl1(struct file *file, 2852 struct snd_pcm_substream *substream, 2853 unsigned int cmd, void __user *arg) 2854 { 2855 struct snd_card *card = substream->pcm->card; 2856 int res; 2857 2858 snd_power_lock(card); 2859 res = snd_power_wait(card, SNDRV_CTL_POWER_D0); 2860 if (res >= 0) 2861 res = snd_pcm_common_ioctl(file, substream, cmd, arg); 2862 snd_power_unlock(card); 2863 return res; 2864 } 2865 2866 static int snd_pcm_playback_ioctl1(struct file *file, 2867 struct snd_pcm_substream *substream, 2868 unsigned int cmd, void __user *arg) 2869 { 2870 if (PCM_RUNTIME_CHECK(substream)) 2871 return -ENXIO; 2872 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2873 return -EINVAL; 2874 switch (cmd) { 2875 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2876 { 2877 struct snd_xferi xferi; 2878 struct snd_xferi __user *_xferi = arg; 2879 struct snd_pcm_runtime *runtime = substream->runtime; 2880 snd_pcm_sframes_t result; 2881 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2882 return -EBADFD; 2883 if (put_user(0, &_xferi->result)) 2884 return -EFAULT; 2885 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2886 return -EFAULT; 2887 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2888 __put_user(result, &_xferi->result); 2889 return result < 0 ? result : 0; 2890 } 2891 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2892 { 2893 struct snd_xfern xfern; 2894 struct snd_xfern __user *_xfern = arg; 2895 struct snd_pcm_runtime *runtime = substream->runtime; 2896 void __user **bufs; 2897 snd_pcm_sframes_t result; 2898 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2899 return -EBADFD; 2900 if (runtime->channels > 128) 2901 return -EINVAL; 2902 if (put_user(0, &_xfern->result)) 2903 return -EFAULT; 2904 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2905 return -EFAULT; 2906 2907 bufs = memdup_user(xfern.bufs, 2908 sizeof(void *) * runtime->channels); 2909 if (IS_ERR(bufs)) 2910 return PTR_ERR(bufs); 2911 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2912 kfree(bufs); 2913 __put_user(result, &_xfern->result); 2914 return result < 0 ? result : 0; 2915 } 2916 case SNDRV_PCM_IOCTL_REWIND: 2917 { 2918 snd_pcm_uframes_t frames; 2919 snd_pcm_uframes_t __user *_frames = arg; 2920 snd_pcm_sframes_t result; 2921 if (get_user(frames, _frames)) 2922 return -EFAULT; 2923 if (put_user(0, _frames)) 2924 return -EFAULT; 2925 result = snd_pcm_playback_rewind(substream, frames); 2926 __put_user(result, _frames); 2927 return result < 0 ? result : 0; 2928 } 2929 case SNDRV_PCM_IOCTL_FORWARD: 2930 { 2931 snd_pcm_uframes_t frames; 2932 snd_pcm_uframes_t __user *_frames = arg; 2933 snd_pcm_sframes_t result; 2934 if (get_user(frames, _frames)) 2935 return -EFAULT; 2936 if (put_user(0, _frames)) 2937 return -EFAULT; 2938 result = snd_pcm_playback_forward(substream, frames); 2939 __put_user(result, _frames); 2940 return result < 0 ? result : 0; 2941 } 2942 } 2943 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2944 } 2945 2946 static int snd_pcm_capture_ioctl1(struct file *file, 2947 struct snd_pcm_substream *substream, 2948 unsigned int cmd, void __user *arg) 2949 { 2950 if (PCM_RUNTIME_CHECK(substream)) 2951 return -ENXIO; 2952 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2953 return -EINVAL; 2954 switch (cmd) { 2955 case SNDRV_PCM_IOCTL_READI_FRAMES: 2956 { 2957 struct snd_xferi xferi; 2958 struct snd_xferi __user *_xferi = arg; 2959 struct snd_pcm_runtime *runtime = substream->runtime; 2960 snd_pcm_sframes_t result; 2961 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2962 return -EBADFD; 2963 if (put_user(0, &_xferi->result)) 2964 return -EFAULT; 2965 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2966 return -EFAULT; 2967 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2968 __put_user(result, &_xferi->result); 2969 return result < 0 ? result : 0; 2970 } 2971 case SNDRV_PCM_IOCTL_READN_FRAMES: 2972 { 2973 struct snd_xfern xfern; 2974 struct snd_xfern __user *_xfern = arg; 2975 struct snd_pcm_runtime *runtime = substream->runtime; 2976 void *bufs; 2977 snd_pcm_sframes_t result; 2978 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2979 return -EBADFD; 2980 if (runtime->channels > 128) 2981 return -EINVAL; 2982 if (put_user(0, &_xfern->result)) 2983 return -EFAULT; 2984 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2985 return -EFAULT; 2986 2987 bufs = memdup_user(xfern.bufs, 2988 sizeof(void *) * runtime->channels); 2989 if (IS_ERR(bufs)) 2990 return PTR_ERR(bufs); 2991 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2992 kfree(bufs); 2993 __put_user(result, &_xfern->result); 2994 return result < 0 ? result : 0; 2995 } 2996 case SNDRV_PCM_IOCTL_REWIND: 2997 { 2998 snd_pcm_uframes_t frames; 2999 snd_pcm_uframes_t __user *_frames = arg; 3000 snd_pcm_sframes_t result; 3001 if (get_user(frames, _frames)) 3002 return -EFAULT; 3003 if (put_user(0, _frames)) 3004 return -EFAULT; 3005 result = snd_pcm_capture_rewind(substream, frames); 3006 __put_user(result, _frames); 3007 return result < 0 ? result : 0; 3008 } 3009 case SNDRV_PCM_IOCTL_FORWARD: 3010 { 3011 snd_pcm_uframes_t frames; 3012 snd_pcm_uframes_t __user *_frames = arg; 3013 snd_pcm_sframes_t result; 3014 if (get_user(frames, _frames)) 3015 return -EFAULT; 3016 if (put_user(0, _frames)) 3017 return -EFAULT; 3018 result = snd_pcm_capture_forward(substream, frames); 3019 __put_user(result, _frames); 3020 return result < 0 ? result : 0; 3021 } 3022 } 3023 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 3024 } 3025 3026 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 3027 unsigned long arg) 3028 { 3029 struct snd_pcm_file *pcm_file; 3030 3031 pcm_file = file->private_data; 3032 3033 if (((cmd >> 8) & 0xff) != 'A') 3034 return -ENOTTY; 3035 3036 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 3037 (void __user *)arg); 3038 } 3039 3040 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 3041 unsigned long arg) 3042 { 3043 struct snd_pcm_file *pcm_file; 3044 3045 pcm_file = file->private_data; 3046 3047 if (((cmd >> 8) & 0xff) != 'A') 3048 return -ENOTTY; 3049 3050 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 3051 (void __user *)arg); 3052 } 3053 3054 /** 3055 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3056 * @substream: PCM substream 3057 * @cmd: IOCTL cmd 3058 * @arg: IOCTL argument 3059 * 3060 * The function is provided primarily for OSS layer and USB gadget drivers, 3061 * and it allows only the limited set of ioctls (hw_params, sw_params, 3062 * prepare, start, drain, drop, forward). 3063 */ 3064 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3065 unsigned int cmd, void *arg) 3066 { 3067 snd_pcm_uframes_t *frames = arg; 3068 snd_pcm_sframes_t result; 3069 3070 switch (cmd) { 3071 case SNDRV_PCM_IOCTL_FORWARD: 3072 { 3073 /* provided only for OSS; capture-only and no value returned */ 3074 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3075 return -EINVAL; 3076 result = snd_pcm_capture_forward(substream, *frames); 3077 return result < 0 ? result : 0; 3078 } 3079 case SNDRV_PCM_IOCTL_HW_PARAMS: 3080 return snd_pcm_hw_params(substream, arg); 3081 case SNDRV_PCM_IOCTL_SW_PARAMS: 3082 return snd_pcm_sw_params(substream, arg); 3083 case SNDRV_PCM_IOCTL_PREPARE: 3084 return snd_pcm_prepare(substream, NULL); 3085 case SNDRV_PCM_IOCTL_START: 3086 return snd_pcm_start_lock_irq(substream); 3087 case SNDRV_PCM_IOCTL_DRAIN: 3088 return snd_pcm_drain(substream, NULL); 3089 case SNDRV_PCM_IOCTL_DROP: 3090 return snd_pcm_drop(substream); 3091 case SNDRV_PCM_IOCTL_DELAY: 3092 { 3093 result = snd_pcm_delay(substream); 3094 if (result < 0) 3095 return result; 3096 *frames = result; 3097 return 0; 3098 } 3099 default: 3100 return -EINVAL; 3101 } 3102 } 3103 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3104 3105 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3106 loff_t * offset) 3107 { 3108 struct snd_pcm_file *pcm_file; 3109 struct snd_pcm_substream *substream; 3110 struct snd_pcm_runtime *runtime; 3111 snd_pcm_sframes_t result; 3112 3113 pcm_file = file->private_data; 3114 substream = pcm_file->substream; 3115 if (PCM_RUNTIME_CHECK(substream)) 3116 return -ENXIO; 3117 runtime = substream->runtime; 3118 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3119 return -EBADFD; 3120 if (!frame_aligned(runtime, count)) 3121 return -EINVAL; 3122 count = bytes_to_frames(runtime, count); 3123 result = snd_pcm_lib_read(substream, buf, count); 3124 if (result > 0) 3125 result = frames_to_bytes(runtime, result); 3126 return result; 3127 } 3128 3129 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3130 size_t count, loff_t * offset) 3131 { 3132 struct snd_pcm_file *pcm_file; 3133 struct snd_pcm_substream *substream; 3134 struct snd_pcm_runtime *runtime; 3135 snd_pcm_sframes_t result; 3136 3137 pcm_file = file->private_data; 3138 substream = pcm_file->substream; 3139 if (PCM_RUNTIME_CHECK(substream)) 3140 return -ENXIO; 3141 runtime = substream->runtime; 3142 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3143 return -EBADFD; 3144 if (!frame_aligned(runtime, count)) 3145 return -EINVAL; 3146 count = bytes_to_frames(runtime, count); 3147 result = snd_pcm_lib_write(substream, buf, count); 3148 if (result > 0) 3149 result = frames_to_bytes(runtime, result); 3150 return result; 3151 } 3152 3153 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3154 { 3155 struct snd_pcm_file *pcm_file; 3156 struct snd_pcm_substream *substream; 3157 struct snd_pcm_runtime *runtime; 3158 snd_pcm_sframes_t result; 3159 unsigned long i; 3160 void __user **bufs; 3161 snd_pcm_uframes_t frames; 3162 3163 pcm_file = iocb->ki_filp->private_data; 3164 substream = pcm_file->substream; 3165 if (PCM_RUNTIME_CHECK(substream)) 3166 return -ENXIO; 3167 runtime = substream->runtime; 3168 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3169 return -EBADFD; 3170 if (!iter_is_iovec(to)) 3171 return -EINVAL; 3172 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3173 return -EINVAL; 3174 if (!frame_aligned(runtime, to->iov->iov_len)) 3175 return -EINVAL; 3176 frames = bytes_to_samples(runtime, to->iov->iov_len); 3177 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3178 if (bufs == NULL) 3179 return -ENOMEM; 3180 for (i = 0; i < to->nr_segs; ++i) 3181 bufs[i] = to->iov[i].iov_base; 3182 result = snd_pcm_lib_readv(substream, bufs, frames); 3183 if (result > 0) 3184 result = frames_to_bytes(runtime, result); 3185 kfree(bufs); 3186 return result; 3187 } 3188 3189 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3190 { 3191 struct snd_pcm_file *pcm_file; 3192 struct snd_pcm_substream *substream; 3193 struct snd_pcm_runtime *runtime; 3194 snd_pcm_sframes_t result; 3195 unsigned long i; 3196 void __user **bufs; 3197 snd_pcm_uframes_t frames; 3198 3199 pcm_file = iocb->ki_filp->private_data; 3200 substream = pcm_file->substream; 3201 if (PCM_RUNTIME_CHECK(substream)) 3202 return -ENXIO; 3203 runtime = substream->runtime; 3204 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3205 return -EBADFD; 3206 if (!iter_is_iovec(from)) 3207 return -EINVAL; 3208 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3209 !frame_aligned(runtime, from->iov->iov_len)) 3210 return -EINVAL; 3211 frames = bytes_to_samples(runtime, from->iov->iov_len); 3212 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3213 if (bufs == NULL) 3214 return -ENOMEM; 3215 for (i = 0; i < from->nr_segs; ++i) 3216 bufs[i] = from->iov[i].iov_base; 3217 result = snd_pcm_lib_writev(substream, bufs, frames); 3218 if (result > 0) 3219 result = frames_to_bytes(runtime, result); 3220 kfree(bufs); 3221 return result; 3222 } 3223 3224 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3225 { 3226 struct snd_pcm_file *pcm_file; 3227 struct snd_pcm_substream *substream; 3228 struct snd_pcm_runtime *runtime; 3229 unsigned int mask; 3230 snd_pcm_uframes_t avail; 3231 3232 pcm_file = file->private_data; 3233 3234 substream = pcm_file->substream; 3235 if (PCM_RUNTIME_CHECK(substream)) 3236 return POLLOUT | POLLWRNORM | POLLERR; 3237 runtime = substream->runtime; 3238 3239 poll_wait(file, &runtime->sleep, wait); 3240 3241 snd_pcm_stream_lock_irq(substream); 3242 avail = snd_pcm_playback_avail(runtime); 3243 switch (runtime->status->state) { 3244 case SNDRV_PCM_STATE_RUNNING: 3245 case SNDRV_PCM_STATE_PREPARED: 3246 case SNDRV_PCM_STATE_PAUSED: 3247 if (avail >= runtime->control->avail_min) { 3248 mask = POLLOUT | POLLWRNORM; 3249 break; 3250 } 3251 /* Fall through */ 3252 case SNDRV_PCM_STATE_DRAINING: 3253 mask = 0; 3254 break; 3255 default: 3256 mask = POLLOUT | POLLWRNORM | POLLERR; 3257 break; 3258 } 3259 snd_pcm_stream_unlock_irq(substream); 3260 return mask; 3261 } 3262 3263 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3264 { 3265 struct snd_pcm_file *pcm_file; 3266 struct snd_pcm_substream *substream; 3267 struct snd_pcm_runtime *runtime; 3268 unsigned int mask; 3269 snd_pcm_uframes_t avail; 3270 3271 pcm_file = file->private_data; 3272 3273 substream = pcm_file->substream; 3274 if (PCM_RUNTIME_CHECK(substream)) 3275 return POLLIN | POLLRDNORM | POLLERR; 3276 runtime = substream->runtime; 3277 3278 poll_wait(file, &runtime->sleep, wait); 3279 3280 snd_pcm_stream_lock_irq(substream); 3281 avail = snd_pcm_capture_avail(runtime); 3282 switch (runtime->status->state) { 3283 case SNDRV_PCM_STATE_RUNNING: 3284 case SNDRV_PCM_STATE_PREPARED: 3285 case SNDRV_PCM_STATE_PAUSED: 3286 if (avail >= runtime->control->avail_min) { 3287 mask = POLLIN | POLLRDNORM; 3288 break; 3289 } 3290 mask = 0; 3291 break; 3292 case SNDRV_PCM_STATE_DRAINING: 3293 if (avail > 0) { 3294 mask = POLLIN | POLLRDNORM; 3295 break; 3296 } 3297 /* Fall through */ 3298 default: 3299 mask = POLLIN | POLLRDNORM | POLLERR; 3300 break; 3301 } 3302 snd_pcm_stream_unlock_irq(substream); 3303 return mask; 3304 } 3305 3306 /* 3307 * mmap support 3308 */ 3309 3310 /* 3311 * Only on coherent architectures, we can mmap the status and the control records 3312 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3313 */ 3314 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3315 /* 3316 * mmap status record 3317 */ 3318 static int snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3319 { 3320 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3321 struct snd_pcm_runtime *runtime; 3322 3323 if (substream == NULL) 3324 return VM_FAULT_SIGBUS; 3325 runtime = substream->runtime; 3326 vmf->page = virt_to_page(runtime->status); 3327 get_page(vmf->page); 3328 return 0; 3329 } 3330 3331 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3332 { 3333 .fault = snd_pcm_mmap_status_fault, 3334 }; 3335 3336 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3337 struct vm_area_struct *area) 3338 { 3339 long size; 3340 if (!(area->vm_flags & VM_READ)) 3341 return -EINVAL; 3342 size = area->vm_end - area->vm_start; 3343 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3344 return -EINVAL; 3345 area->vm_ops = &snd_pcm_vm_ops_status; 3346 area->vm_private_data = substream; 3347 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3348 return 0; 3349 } 3350 3351 /* 3352 * mmap control record 3353 */ 3354 static int snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3355 { 3356 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3357 struct snd_pcm_runtime *runtime; 3358 3359 if (substream == NULL) 3360 return VM_FAULT_SIGBUS; 3361 runtime = substream->runtime; 3362 vmf->page = virt_to_page(runtime->control); 3363 get_page(vmf->page); 3364 return 0; 3365 } 3366 3367 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3368 { 3369 .fault = snd_pcm_mmap_control_fault, 3370 }; 3371 3372 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3373 struct vm_area_struct *area) 3374 { 3375 long size; 3376 if (!(area->vm_flags & VM_READ)) 3377 return -EINVAL; 3378 size = area->vm_end - area->vm_start; 3379 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3380 return -EINVAL; 3381 area->vm_ops = &snd_pcm_vm_ops_control; 3382 area->vm_private_data = substream; 3383 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3384 return 0; 3385 } 3386 3387 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3388 { 3389 if (pcm_file->no_compat_mmap) 3390 return false; 3391 /* See pcm_control_mmap_allowed() below. 3392 * Since older alsa-lib requires both status and control mmaps to be 3393 * coupled, we have to disable the status mmap for old alsa-lib, too. 3394 */ 3395 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3396 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3397 return false; 3398 return true; 3399 } 3400 3401 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3402 { 3403 if (pcm_file->no_compat_mmap) 3404 return false; 3405 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3406 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3407 * thus it effectively assures the manual update of appl_ptr. 3408 */ 3409 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3410 return false; 3411 return true; 3412 } 3413 3414 #else /* ! coherent mmap */ 3415 /* 3416 * don't support mmap for status and control records. 3417 */ 3418 #define pcm_status_mmap_allowed(pcm_file) false 3419 #define pcm_control_mmap_allowed(pcm_file) false 3420 3421 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3422 struct vm_area_struct *area) 3423 { 3424 return -ENXIO; 3425 } 3426 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3427 struct vm_area_struct *area) 3428 { 3429 return -ENXIO; 3430 } 3431 #endif /* coherent mmap */ 3432 3433 static inline struct page * 3434 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3435 { 3436 void *vaddr = substream->runtime->dma_area + ofs; 3437 return virt_to_page(vaddr); 3438 } 3439 3440 /* 3441 * fault callback for mmapping a RAM page 3442 */ 3443 static int snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3444 { 3445 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3446 struct snd_pcm_runtime *runtime; 3447 unsigned long offset; 3448 struct page * page; 3449 size_t dma_bytes; 3450 3451 if (substream == NULL) 3452 return VM_FAULT_SIGBUS; 3453 runtime = substream->runtime; 3454 offset = vmf->pgoff << PAGE_SHIFT; 3455 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3456 if (offset > dma_bytes - PAGE_SIZE) 3457 return VM_FAULT_SIGBUS; 3458 if (substream->ops->page) 3459 page = substream->ops->page(substream, offset); 3460 else 3461 page = snd_pcm_default_page_ops(substream, offset); 3462 if (!page) 3463 return VM_FAULT_SIGBUS; 3464 get_page(page); 3465 vmf->page = page; 3466 return 0; 3467 } 3468 3469 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3470 .open = snd_pcm_mmap_data_open, 3471 .close = snd_pcm_mmap_data_close, 3472 }; 3473 3474 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3475 .open = snd_pcm_mmap_data_open, 3476 .close = snd_pcm_mmap_data_close, 3477 .fault = snd_pcm_mmap_data_fault, 3478 }; 3479 3480 /* 3481 * mmap the DMA buffer on RAM 3482 */ 3483 3484 /** 3485 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3486 * @substream: PCM substream 3487 * @area: VMA 3488 * 3489 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3490 * this function is invoked implicitly. 3491 */ 3492 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3493 struct vm_area_struct *area) 3494 { 3495 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3496 #ifdef CONFIG_GENERIC_ALLOCATOR 3497 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3498 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3499 return remap_pfn_range(area, area->vm_start, 3500 substream->dma_buffer.addr >> PAGE_SHIFT, 3501 area->vm_end - area->vm_start, area->vm_page_prot); 3502 } 3503 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3504 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3505 if (!substream->ops->page && 3506 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3507 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3508 area, 3509 substream->runtime->dma_area, 3510 substream->runtime->dma_addr, 3511 area->vm_end - area->vm_start); 3512 #endif /* CONFIG_X86 */ 3513 /* mmap with fault handler */ 3514 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3515 return 0; 3516 } 3517 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3518 3519 /* 3520 * mmap the DMA buffer on I/O memory area 3521 */ 3522 #if SNDRV_PCM_INFO_MMAP_IOMEM 3523 /** 3524 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3525 * @substream: PCM substream 3526 * @area: VMA 3527 * 3528 * When your hardware uses the iomapped pages as the hardware buffer and 3529 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3530 * is supposed to work only on limited architectures. 3531 */ 3532 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3533 struct vm_area_struct *area) 3534 { 3535 struct snd_pcm_runtime *runtime = substream->runtime;; 3536 3537 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3538 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3539 } 3540 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3541 #endif /* SNDRV_PCM_INFO_MMAP */ 3542 3543 /* 3544 * mmap DMA buffer 3545 */ 3546 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3547 struct vm_area_struct *area) 3548 { 3549 struct snd_pcm_runtime *runtime; 3550 long size; 3551 unsigned long offset; 3552 size_t dma_bytes; 3553 int err; 3554 3555 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3556 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3557 return -EINVAL; 3558 } else { 3559 if (!(area->vm_flags & VM_READ)) 3560 return -EINVAL; 3561 } 3562 runtime = substream->runtime; 3563 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3564 return -EBADFD; 3565 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3566 return -ENXIO; 3567 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3568 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3569 return -EINVAL; 3570 size = area->vm_end - area->vm_start; 3571 offset = area->vm_pgoff << PAGE_SHIFT; 3572 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3573 if ((size_t)size > dma_bytes) 3574 return -EINVAL; 3575 if (offset > dma_bytes - size) 3576 return -EINVAL; 3577 3578 area->vm_ops = &snd_pcm_vm_ops_data; 3579 area->vm_private_data = substream; 3580 if (substream->ops->mmap) 3581 err = substream->ops->mmap(substream, area); 3582 else 3583 err = snd_pcm_lib_default_mmap(substream, area); 3584 if (!err) 3585 atomic_inc(&substream->mmap_count); 3586 return err; 3587 } 3588 EXPORT_SYMBOL(snd_pcm_mmap_data); 3589 3590 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3591 { 3592 struct snd_pcm_file * pcm_file; 3593 struct snd_pcm_substream *substream; 3594 unsigned long offset; 3595 3596 pcm_file = file->private_data; 3597 substream = pcm_file->substream; 3598 if (PCM_RUNTIME_CHECK(substream)) 3599 return -ENXIO; 3600 3601 offset = area->vm_pgoff << PAGE_SHIFT; 3602 switch (offset) { 3603 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3604 if (!pcm_status_mmap_allowed(pcm_file)) 3605 return -ENXIO; 3606 return snd_pcm_mmap_status(substream, file, area); 3607 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3608 if (!pcm_control_mmap_allowed(pcm_file)) 3609 return -ENXIO; 3610 return snd_pcm_mmap_control(substream, file, area); 3611 default: 3612 return snd_pcm_mmap_data(substream, file, area); 3613 } 3614 return 0; 3615 } 3616 3617 static int snd_pcm_fasync(int fd, struct file * file, int on) 3618 { 3619 struct snd_pcm_file * pcm_file; 3620 struct snd_pcm_substream *substream; 3621 struct snd_pcm_runtime *runtime; 3622 3623 pcm_file = file->private_data; 3624 substream = pcm_file->substream; 3625 if (PCM_RUNTIME_CHECK(substream)) 3626 return -ENXIO; 3627 runtime = substream->runtime; 3628 return fasync_helper(fd, file, on, &runtime->fasync); 3629 } 3630 3631 /* 3632 * ioctl32 compat 3633 */ 3634 #ifdef CONFIG_COMPAT 3635 #include "pcm_compat.c" 3636 #else 3637 #define snd_pcm_ioctl_compat NULL 3638 #endif 3639 3640 /* 3641 * To be removed helpers to keep binary compatibility 3642 */ 3643 3644 #ifdef CONFIG_SND_SUPPORT_OLD_API 3645 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3646 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3647 3648 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3649 struct snd_pcm_hw_params_old *oparams) 3650 { 3651 unsigned int i; 3652 3653 memset(params, 0, sizeof(*params)); 3654 params->flags = oparams->flags; 3655 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3656 params->masks[i].bits[0] = oparams->masks[i]; 3657 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3658 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3659 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3660 params->info = oparams->info; 3661 params->msbits = oparams->msbits; 3662 params->rate_num = oparams->rate_num; 3663 params->rate_den = oparams->rate_den; 3664 params->fifo_size = oparams->fifo_size; 3665 } 3666 3667 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3668 struct snd_pcm_hw_params *params) 3669 { 3670 unsigned int i; 3671 3672 memset(oparams, 0, sizeof(*oparams)); 3673 oparams->flags = params->flags; 3674 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3675 oparams->masks[i] = params->masks[i].bits[0]; 3676 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3677 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3678 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3679 oparams->info = params->info; 3680 oparams->msbits = params->msbits; 3681 oparams->rate_num = params->rate_num; 3682 oparams->rate_den = params->rate_den; 3683 oparams->fifo_size = params->fifo_size; 3684 } 3685 3686 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3687 struct snd_pcm_hw_params_old __user * _oparams) 3688 { 3689 struct snd_pcm_hw_params *params; 3690 struct snd_pcm_hw_params_old *oparams = NULL; 3691 int err; 3692 3693 params = kmalloc(sizeof(*params), GFP_KERNEL); 3694 if (!params) 3695 return -ENOMEM; 3696 3697 oparams = memdup_user(_oparams, sizeof(*oparams)); 3698 if (IS_ERR(oparams)) { 3699 err = PTR_ERR(oparams); 3700 goto out; 3701 } 3702 snd_pcm_hw_convert_from_old_params(params, oparams); 3703 err = snd_pcm_hw_refine(substream, params); 3704 if (err < 0) 3705 goto out_old; 3706 3707 err = fixup_unreferenced_params(substream, params); 3708 if (err < 0) 3709 goto out_old; 3710 3711 snd_pcm_hw_convert_to_old_params(oparams, params); 3712 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3713 err = -EFAULT; 3714 out_old: 3715 kfree(oparams); 3716 out: 3717 kfree(params); 3718 return err; 3719 } 3720 3721 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3722 struct snd_pcm_hw_params_old __user * _oparams) 3723 { 3724 struct snd_pcm_hw_params *params; 3725 struct snd_pcm_hw_params_old *oparams = NULL; 3726 int err; 3727 3728 params = kmalloc(sizeof(*params), GFP_KERNEL); 3729 if (!params) 3730 return -ENOMEM; 3731 3732 oparams = memdup_user(_oparams, sizeof(*oparams)); 3733 if (IS_ERR(oparams)) { 3734 err = PTR_ERR(oparams); 3735 goto out; 3736 } 3737 3738 snd_pcm_hw_convert_from_old_params(params, oparams); 3739 err = snd_pcm_hw_params(substream, params); 3740 if (err < 0) 3741 goto out_old; 3742 3743 snd_pcm_hw_convert_to_old_params(oparams, params); 3744 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3745 err = -EFAULT; 3746 out_old: 3747 kfree(oparams); 3748 out: 3749 kfree(params); 3750 return err; 3751 } 3752 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3753 3754 #ifndef CONFIG_MMU 3755 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3756 unsigned long addr, 3757 unsigned long len, 3758 unsigned long pgoff, 3759 unsigned long flags) 3760 { 3761 struct snd_pcm_file *pcm_file = file->private_data; 3762 struct snd_pcm_substream *substream = pcm_file->substream; 3763 struct snd_pcm_runtime *runtime = substream->runtime; 3764 unsigned long offset = pgoff << PAGE_SHIFT; 3765 3766 switch (offset) { 3767 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3768 return (unsigned long)runtime->status; 3769 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3770 return (unsigned long)runtime->control; 3771 default: 3772 return (unsigned long)runtime->dma_area + offset; 3773 } 3774 } 3775 #else 3776 # define snd_pcm_get_unmapped_area NULL 3777 #endif 3778 3779 /* 3780 * Register section 3781 */ 3782 3783 const struct file_operations snd_pcm_f_ops[2] = { 3784 { 3785 .owner = THIS_MODULE, 3786 .write = snd_pcm_write, 3787 .write_iter = snd_pcm_writev, 3788 .open = snd_pcm_playback_open, 3789 .release = snd_pcm_release, 3790 .llseek = no_llseek, 3791 .poll = snd_pcm_playback_poll, 3792 .unlocked_ioctl = snd_pcm_playback_ioctl, 3793 .compat_ioctl = snd_pcm_ioctl_compat, 3794 .mmap = snd_pcm_mmap, 3795 .fasync = snd_pcm_fasync, 3796 .get_unmapped_area = snd_pcm_get_unmapped_area, 3797 }, 3798 { 3799 .owner = THIS_MODULE, 3800 .read = snd_pcm_read, 3801 .read_iter = snd_pcm_readv, 3802 .open = snd_pcm_capture_open, 3803 .release = snd_pcm_release, 3804 .llseek = no_llseek, 3805 .poll = snd_pcm_capture_poll, 3806 .unlocked_ioctl = snd_pcm_capture_ioctl, 3807 .compat_ioctl = snd_pcm_ioctl_compat, 3808 .mmap = snd_pcm_mmap, 3809 .fasync = snd_pcm_fasync, 3810 .get_unmapped_area = snd_pcm_get_unmapped_area, 3811 } 3812 }; 3813