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/time.h> 27 #include <linux/pm_qos.h> 28 #include <linux/aio.h> 29 #include <linux/dma-mapping.h> 30 #include <sound/core.h> 31 #include <sound/control.h> 32 #include <sound/info.h> 33 #include <sound/pcm.h> 34 #include <sound/pcm_params.h> 35 #include <sound/timer.h> 36 #include <sound/minors.h> 37 #include <asm/io.h> 38 39 /* 40 * Compatibility 41 */ 42 43 struct snd_pcm_hw_params_old { 44 unsigned int flags; 45 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 46 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 47 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 48 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 49 unsigned int rmask; 50 unsigned int cmask; 51 unsigned int info; 52 unsigned int msbits; 53 unsigned int rate_num; 54 unsigned int rate_den; 55 snd_pcm_uframes_t fifo_size; 56 unsigned char reserved[64]; 57 }; 58 59 #ifdef CONFIG_SND_SUPPORT_OLD_API 60 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 61 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 62 63 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 64 struct snd_pcm_hw_params_old __user * _oparams); 65 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 66 struct snd_pcm_hw_params_old __user * _oparams); 67 #endif 68 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 69 70 /* 71 * 72 */ 73 74 static DEFINE_RWLOCK(snd_pcm_link_rwlock); 75 static DECLARE_RWSEM(snd_pcm_link_rwsem); 76 77 /** 78 * snd_pcm_stream_lock - Lock the PCM stream 79 * @substream: PCM substream 80 * 81 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 82 * flag of the given substream. This also takes the global link rw lock 83 * (or rw sem), too, for avoiding the race with linked streams. 84 */ 85 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 86 { 87 if (substream->pcm->nonatomic) { 88 down_read(&snd_pcm_link_rwsem); 89 mutex_lock(&substream->self_group.mutex); 90 } else { 91 read_lock(&snd_pcm_link_rwlock); 92 spin_lock(&substream->self_group.lock); 93 } 94 } 95 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 96 97 /** 98 * snd_pcm_stream_lock - Unlock the PCM stream 99 * @substream: PCM substream 100 * 101 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 102 */ 103 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 104 { 105 if (substream->pcm->nonatomic) { 106 mutex_unlock(&substream->self_group.mutex); 107 up_read(&snd_pcm_link_rwsem); 108 } else { 109 spin_unlock(&substream->self_group.lock); 110 read_unlock(&snd_pcm_link_rwlock); 111 } 112 } 113 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 114 115 /** 116 * snd_pcm_stream_lock_irq - Lock the PCM stream 117 * @substream: PCM substream 118 * 119 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 120 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 121 * as snd_pcm_stream_lock(). 122 */ 123 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 124 { 125 if (!substream->pcm->nonatomic) 126 local_irq_disable(); 127 snd_pcm_stream_lock(substream); 128 } 129 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 130 131 /** 132 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 133 * @substream: PCM substream 134 * 135 * This is a counter-part of snd_pcm_stream_lock_irq(). 136 */ 137 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 138 { 139 snd_pcm_stream_unlock(substream); 140 if (!substream->pcm->nonatomic) 141 local_irq_enable(); 142 } 143 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 144 145 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 146 { 147 unsigned long flags = 0; 148 if (!substream->pcm->nonatomic) 149 local_irq_save(flags); 150 snd_pcm_stream_lock(substream); 151 return flags; 152 } 153 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 154 155 /** 156 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 157 * @substream: PCM substream 158 * @flags: irq flags 159 * 160 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 161 */ 162 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 163 unsigned long flags) 164 { 165 snd_pcm_stream_unlock(substream); 166 if (!substream->pcm->nonatomic) 167 local_irq_restore(flags); 168 } 169 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 170 171 static inline mm_segment_t snd_enter_user(void) 172 { 173 mm_segment_t fs = get_fs(); 174 set_fs(get_ds()); 175 return fs; 176 } 177 178 static inline void snd_leave_user(mm_segment_t fs) 179 { 180 set_fs(fs); 181 } 182 183 184 185 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 186 { 187 struct snd_pcm_runtime *runtime; 188 struct snd_pcm *pcm = substream->pcm; 189 struct snd_pcm_str *pstr = substream->pstr; 190 191 memset(info, 0, sizeof(*info)); 192 info->card = pcm->card->number; 193 info->device = pcm->device; 194 info->stream = substream->stream; 195 info->subdevice = substream->number; 196 strlcpy(info->id, pcm->id, sizeof(info->id)); 197 strlcpy(info->name, pcm->name, sizeof(info->name)); 198 info->dev_class = pcm->dev_class; 199 info->dev_subclass = pcm->dev_subclass; 200 info->subdevices_count = pstr->substream_count; 201 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 202 strlcpy(info->subname, substream->name, sizeof(info->subname)); 203 runtime = substream->runtime; 204 /* AB: FIXME!!! This is definitely nonsense */ 205 if (runtime) { 206 info->sync = runtime->sync; 207 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info); 208 } 209 return 0; 210 } 211 212 int snd_pcm_info_user(struct snd_pcm_substream *substream, 213 struct snd_pcm_info __user * _info) 214 { 215 struct snd_pcm_info *info; 216 int err; 217 218 info = kmalloc(sizeof(*info), GFP_KERNEL); 219 if (! info) 220 return -ENOMEM; 221 err = snd_pcm_info(substream, info); 222 if (err >= 0) { 223 if (copy_to_user(_info, info, sizeof(*info))) 224 err = -EFAULT; 225 } 226 kfree(info); 227 return err; 228 } 229 230 static bool hw_support_mmap(struct snd_pcm_substream *substream) 231 { 232 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 233 return false; 234 /* check architectures that return -EINVAL from dma_mmap_coherent() */ 235 /* FIXME: this should be some global flag */ 236 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\ 237 defined(CONFIG_PARISC) || defined(CONFIG_XTENSA) 238 if (!substream->ops->mmap && 239 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 240 return false; 241 #endif 242 return true; 243 } 244 245 #undef RULES_DEBUG 246 247 #ifdef RULES_DEBUG 248 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v 249 static const char * const snd_pcm_hw_param_names[] = { 250 HW_PARAM(ACCESS), 251 HW_PARAM(FORMAT), 252 HW_PARAM(SUBFORMAT), 253 HW_PARAM(SAMPLE_BITS), 254 HW_PARAM(FRAME_BITS), 255 HW_PARAM(CHANNELS), 256 HW_PARAM(RATE), 257 HW_PARAM(PERIOD_TIME), 258 HW_PARAM(PERIOD_SIZE), 259 HW_PARAM(PERIOD_BYTES), 260 HW_PARAM(PERIODS), 261 HW_PARAM(BUFFER_TIME), 262 HW_PARAM(BUFFER_SIZE), 263 HW_PARAM(BUFFER_BYTES), 264 HW_PARAM(TICK_TIME), 265 }; 266 #endif 267 268 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 269 struct snd_pcm_hw_params *params) 270 { 271 unsigned int k; 272 struct snd_pcm_hardware *hw; 273 struct snd_interval *i = NULL; 274 struct snd_mask *m = NULL; 275 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints; 276 unsigned int rstamps[constrs->rules_num]; 277 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 278 unsigned int stamp = 2; 279 int changed, again; 280 281 params->info = 0; 282 params->fifo_size = 0; 283 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 284 params->msbits = 0; 285 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 286 params->rate_num = 0; 287 params->rate_den = 0; 288 } 289 290 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 291 m = hw_param_mask(params, k); 292 if (snd_mask_empty(m)) 293 return -EINVAL; 294 if (!(params->rmask & (1 << k))) 295 continue; 296 #ifdef RULES_DEBUG 297 pr_debug("%s = ", snd_pcm_hw_param_names[k]); 298 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 299 #endif 300 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 301 #ifdef RULES_DEBUG 302 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 303 #endif 304 if (changed) 305 params->cmask |= 1 << k; 306 if (changed < 0) 307 return changed; 308 } 309 310 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 311 i = hw_param_interval(params, k); 312 if (snd_interval_empty(i)) 313 return -EINVAL; 314 if (!(params->rmask & (1 << k))) 315 continue; 316 #ifdef RULES_DEBUG 317 pr_debug("%s = ", snd_pcm_hw_param_names[k]); 318 if (i->empty) 319 pr_cont("empty"); 320 else 321 pr_cont("%c%u %u%c", 322 i->openmin ? '(' : '[', i->min, 323 i->max, i->openmax ? ')' : ']'); 324 pr_cont(" -> "); 325 #endif 326 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 327 #ifdef RULES_DEBUG 328 if (i->empty) 329 pr_cont("empty\n"); 330 else 331 pr_cont("%c%u %u%c\n", 332 i->openmin ? '(' : '[', i->min, 333 i->max, i->openmax ? ')' : ']'); 334 #endif 335 if (changed) 336 params->cmask |= 1 << k; 337 if (changed < 0) 338 return changed; 339 } 340 341 for (k = 0; k < constrs->rules_num; k++) 342 rstamps[k] = 0; 343 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 344 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 345 do { 346 again = 0; 347 for (k = 0; k < constrs->rules_num; k++) { 348 struct snd_pcm_hw_rule *r = &constrs->rules[k]; 349 unsigned int d; 350 int doit = 0; 351 if (r->cond && !(r->cond & params->flags)) 352 continue; 353 for (d = 0; r->deps[d] >= 0; d++) { 354 if (vstamps[r->deps[d]] > rstamps[k]) { 355 doit = 1; 356 break; 357 } 358 } 359 if (!doit) 360 continue; 361 #ifdef RULES_DEBUG 362 pr_debug("Rule %d [%p]: ", k, r->func); 363 if (r->var >= 0) { 364 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]); 365 if (hw_is_mask(r->var)) { 366 m = hw_param_mask(params, r->var); 367 pr_cont("%x", *m->bits); 368 } else { 369 i = hw_param_interval(params, r->var); 370 if (i->empty) 371 pr_cont("empty"); 372 else 373 pr_cont("%c%u %u%c", 374 i->openmin ? '(' : '[', i->min, 375 i->max, i->openmax ? ')' : ']'); 376 } 377 } 378 #endif 379 changed = r->func(params, r); 380 #ifdef RULES_DEBUG 381 if (r->var >= 0) { 382 pr_cont(" -> "); 383 if (hw_is_mask(r->var)) 384 pr_cont("%x", *m->bits); 385 else { 386 if (i->empty) 387 pr_cont("empty"); 388 else 389 pr_cont("%c%u %u%c", 390 i->openmin ? '(' : '[', i->min, 391 i->max, i->openmax ? ')' : ']'); 392 } 393 } 394 pr_cont("\n"); 395 #endif 396 rstamps[k] = stamp; 397 if (changed && r->var >= 0) { 398 params->cmask |= (1 << r->var); 399 vstamps[r->var] = stamp; 400 again = 1; 401 } 402 if (changed < 0) 403 return changed; 404 stamp++; 405 } 406 } while (again); 407 if (!params->msbits) { 408 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 409 if (snd_interval_single(i)) 410 params->msbits = snd_interval_value(i); 411 } 412 413 if (!params->rate_den) { 414 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 415 if (snd_interval_single(i)) { 416 params->rate_num = snd_interval_value(i); 417 params->rate_den = 1; 418 } 419 } 420 421 hw = &substream->runtime->hw; 422 if (!params->info) { 423 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES; 424 if (!hw_support_mmap(substream)) 425 params->info &= ~(SNDRV_PCM_INFO_MMAP | 426 SNDRV_PCM_INFO_MMAP_VALID); 427 } 428 if (!params->fifo_size) { 429 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 430 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 431 if (snd_mask_min(m) == snd_mask_max(m) && 432 snd_interval_min(i) == snd_interval_max(i)) { 433 changed = substream->ops->ioctl(substream, 434 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 435 if (changed < 0) 436 return changed; 437 } 438 } 439 params->rmask = 0; 440 return 0; 441 } 442 443 EXPORT_SYMBOL(snd_pcm_hw_refine); 444 445 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 446 struct snd_pcm_hw_params __user * _params) 447 { 448 struct snd_pcm_hw_params *params; 449 int err; 450 451 params = memdup_user(_params, sizeof(*params)); 452 if (IS_ERR(params)) 453 return PTR_ERR(params); 454 455 err = snd_pcm_hw_refine(substream, params); 456 if (copy_to_user(_params, params, sizeof(*params))) { 457 if (!err) 458 err = -EFAULT; 459 } 460 461 kfree(params); 462 return err; 463 } 464 465 static int period_to_usecs(struct snd_pcm_runtime *runtime) 466 { 467 int usecs; 468 469 if (! runtime->rate) 470 return -1; /* invalid */ 471 472 /* take 75% of period time as the deadline */ 473 usecs = (750000 / runtime->rate) * runtime->period_size; 474 usecs += ((750000 % runtime->rate) * runtime->period_size) / 475 runtime->rate; 476 477 return usecs; 478 } 479 480 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 481 { 482 snd_pcm_stream_lock_irq(substream); 483 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 484 substream->runtime->status->state = state; 485 snd_pcm_stream_unlock_irq(substream); 486 } 487 488 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 489 struct snd_pcm_hw_params *params) 490 { 491 struct snd_pcm_runtime *runtime; 492 int err, usecs; 493 unsigned int bits; 494 snd_pcm_uframes_t frames; 495 496 if (PCM_RUNTIME_CHECK(substream)) 497 return -ENXIO; 498 runtime = substream->runtime; 499 snd_pcm_stream_lock_irq(substream); 500 switch (runtime->status->state) { 501 case SNDRV_PCM_STATE_OPEN: 502 case SNDRV_PCM_STATE_SETUP: 503 case SNDRV_PCM_STATE_PREPARED: 504 break; 505 default: 506 snd_pcm_stream_unlock_irq(substream); 507 return -EBADFD; 508 } 509 snd_pcm_stream_unlock_irq(substream); 510 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 511 if (!substream->oss.oss) 512 #endif 513 if (atomic_read(&substream->mmap_count)) 514 return -EBADFD; 515 516 params->rmask = ~0U; 517 err = snd_pcm_hw_refine(substream, params); 518 if (err < 0) 519 goto _error; 520 521 err = snd_pcm_hw_params_choose(substream, params); 522 if (err < 0) 523 goto _error; 524 525 if (substream->ops->hw_params != NULL) { 526 err = substream->ops->hw_params(substream, params); 527 if (err < 0) 528 goto _error; 529 } 530 531 runtime->access = params_access(params); 532 runtime->format = params_format(params); 533 runtime->subformat = params_subformat(params); 534 runtime->channels = params_channels(params); 535 runtime->rate = params_rate(params); 536 runtime->period_size = params_period_size(params); 537 runtime->periods = params_periods(params); 538 runtime->buffer_size = params_buffer_size(params); 539 runtime->info = params->info; 540 runtime->rate_num = params->rate_num; 541 runtime->rate_den = params->rate_den; 542 runtime->no_period_wakeup = 543 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 544 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 545 546 bits = snd_pcm_format_physical_width(runtime->format); 547 runtime->sample_bits = bits; 548 bits *= runtime->channels; 549 runtime->frame_bits = bits; 550 frames = 1; 551 while (bits % 8 != 0) { 552 bits *= 2; 553 frames *= 2; 554 } 555 runtime->byte_align = bits / 8; 556 runtime->min_align = frames; 557 558 /* Default sw params */ 559 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 560 runtime->period_step = 1; 561 runtime->control->avail_min = runtime->period_size; 562 runtime->start_threshold = 1; 563 runtime->stop_threshold = runtime->buffer_size; 564 runtime->silence_threshold = 0; 565 runtime->silence_size = 0; 566 runtime->boundary = runtime->buffer_size; 567 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 568 runtime->boundary *= 2; 569 570 snd_pcm_timer_resolution_change(substream); 571 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 572 573 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 574 pm_qos_remove_request(&substream->latency_pm_qos_req); 575 if ((usecs = period_to_usecs(runtime)) >= 0) 576 pm_qos_add_request(&substream->latency_pm_qos_req, 577 PM_QOS_CPU_DMA_LATENCY, usecs); 578 return 0; 579 _error: 580 /* hardware might be unusable from this time, 581 so we force application to retry to set 582 the correct hardware parameter settings */ 583 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 584 if (substream->ops->hw_free != NULL) 585 substream->ops->hw_free(substream); 586 return err; 587 } 588 589 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 590 struct snd_pcm_hw_params __user * _params) 591 { 592 struct snd_pcm_hw_params *params; 593 int err; 594 595 params = memdup_user(_params, sizeof(*params)); 596 if (IS_ERR(params)) 597 return PTR_ERR(params); 598 599 err = snd_pcm_hw_params(substream, params); 600 if (copy_to_user(_params, params, sizeof(*params))) { 601 if (!err) 602 err = -EFAULT; 603 } 604 605 kfree(params); 606 return err; 607 } 608 609 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 610 { 611 struct snd_pcm_runtime *runtime; 612 int result = 0; 613 614 if (PCM_RUNTIME_CHECK(substream)) 615 return -ENXIO; 616 runtime = substream->runtime; 617 snd_pcm_stream_lock_irq(substream); 618 switch (runtime->status->state) { 619 case SNDRV_PCM_STATE_SETUP: 620 case SNDRV_PCM_STATE_PREPARED: 621 break; 622 default: 623 snd_pcm_stream_unlock_irq(substream); 624 return -EBADFD; 625 } 626 snd_pcm_stream_unlock_irq(substream); 627 if (atomic_read(&substream->mmap_count)) 628 return -EBADFD; 629 if (substream->ops->hw_free) 630 result = substream->ops->hw_free(substream); 631 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 632 pm_qos_remove_request(&substream->latency_pm_qos_req); 633 return result; 634 } 635 636 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 637 struct snd_pcm_sw_params *params) 638 { 639 struct snd_pcm_runtime *runtime; 640 int err; 641 642 if (PCM_RUNTIME_CHECK(substream)) 643 return -ENXIO; 644 runtime = substream->runtime; 645 snd_pcm_stream_lock_irq(substream); 646 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 647 snd_pcm_stream_unlock_irq(substream); 648 return -EBADFD; 649 } 650 snd_pcm_stream_unlock_irq(substream); 651 652 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 653 return -EINVAL; 654 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 655 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 656 return -EINVAL; 657 if (params->avail_min == 0) 658 return -EINVAL; 659 if (params->silence_size >= runtime->boundary) { 660 if (params->silence_threshold != 0) 661 return -EINVAL; 662 } else { 663 if (params->silence_size > params->silence_threshold) 664 return -EINVAL; 665 if (params->silence_threshold > runtime->buffer_size) 666 return -EINVAL; 667 } 668 err = 0; 669 snd_pcm_stream_lock_irq(substream); 670 runtime->tstamp_mode = params->tstamp_mode; 671 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 672 runtime->tstamp_type = params->tstamp_type; 673 runtime->period_step = params->period_step; 674 runtime->control->avail_min = params->avail_min; 675 runtime->start_threshold = params->start_threshold; 676 runtime->stop_threshold = params->stop_threshold; 677 runtime->silence_threshold = params->silence_threshold; 678 runtime->silence_size = params->silence_size; 679 params->boundary = runtime->boundary; 680 if (snd_pcm_running(substream)) { 681 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 682 runtime->silence_size > 0) 683 snd_pcm_playback_silence(substream, ULONG_MAX); 684 err = snd_pcm_update_state(substream, runtime); 685 } 686 snd_pcm_stream_unlock_irq(substream); 687 return err; 688 } 689 690 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 691 struct snd_pcm_sw_params __user * _params) 692 { 693 struct snd_pcm_sw_params params; 694 int err; 695 if (copy_from_user(¶ms, _params, sizeof(params))) 696 return -EFAULT; 697 err = snd_pcm_sw_params(substream, ¶ms); 698 if (copy_to_user(_params, ¶ms, sizeof(params))) 699 return -EFAULT; 700 return err; 701 } 702 703 int snd_pcm_status(struct snd_pcm_substream *substream, 704 struct snd_pcm_status *status) 705 { 706 struct snd_pcm_runtime *runtime = substream->runtime; 707 708 snd_pcm_stream_lock_irq(substream); 709 status->state = runtime->status->state; 710 status->suspended_state = runtime->status->suspended_state; 711 if (status->state == SNDRV_PCM_STATE_OPEN) 712 goto _end; 713 status->trigger_tstamp = runtime->trigger_tstamp; 714 if (snd_pcm_running(substream)) { 715 snd_pcm_update_hw_ptr(substream); 716 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 717 status->tstamp = runtime->status->tstamp; 718 status->audio_tstamp = 719 runtime->status->audio_tstamp; 720 goto _tstamp_end; 721 } 722 } 723 snd_pcm_gettime(runtime, &status->tstamp); 724 _tstamp_end: 725 status->appl_ptr = runtime->control->appl_ptr; 726 status->hw_ptr = runtime->status->hw_ptr; 727 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 728 status->avail = snd_pcm_playback_avail(runtime); 729 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 730 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 731 status->delay = runtime->buffer_size - status->avail; 732 status->delay += runtime->delay; 733 } else 734 status->delay = 0; 735 } else { 736 status->avail = snd_pcm_capture_avail(runtime); 737 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 738 status->delay = status->avail + runtime->delay; 739 else 740 status->delay = 0; 741 } 742 status->avail_max = runtime->avail_max; 743 status->overrange = runtime->overrange; 744 runtime->avail_max = 0; 745 runtime->overrange = 0; 746 _end: 747 snd_pcm_stream_unlock_irq(substream); 748 return 0; 749 } 750 751 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 752 struct snd_pcm_status __user * _status) 753 { 754 struct snd_pcm_status status; 755 int res; 756 757 memset(&status, 0, sizeof(status)); 758 res = snd_pcm_status(substream, &status); 759 if (res < 0) 760 return res; 761 if (copy_to_user(_status, &status, sizeof(status))) 762 return -EFAULT; 763 return 0; 764 } 765 766 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 767 struct snd_pcm_channel_info * info) 768 { 769 struct snd_pcm_runtime *runtime; 770 unsigned int channel; 771 772 channel = info->channel; 773 runtime = substream->runtime; 774 snd_pcm_stream_lock_irq(substream); 775 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 776 snd_pcm_stream_unlock_irq(substream); 777 return -EBADFD; 778 } 779 snd_pcm_stream_unlock_irq(substream); 780 if (channel >= runtime->channels) 781 return -EINVAL; 782 memset(info, 0, sizeof(*info)); 783 info->channel = channel; 784 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 785 } 786 787 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 788 struct snd_pcm_channel_info __user * _info) 789 { 790 struct snd_pcm_channel_info info; 791 int res; 792 793 if (copy_from_user(&info, _info, sizeof(info))) 794 return -EFAULT; 795 res = snd_pcm_channel_info(substream, &info); 796 if (res < 0) 797 return res; 798 if (copy_to_user(_info, &info, sizeof(info))) 799 return -EFAULT; 800 return 0; 801 } 802 803 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 804 { 805 struct snd_pcm_runtime *runtime = substream->runtime; 806 if (runtime->trigger_master == NULL) 807 return; 808 if (runtime->trigger_master == substream) { 809 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 810 } else { 811 snd_pcm_trigger_tstamp(runtime->trigger_master); 812 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 813 } 814 runtime->trigger_master = NULL; 815 } 816 817 struct action_ops { 818 int (*pre_action)(struct snd_pcm_substream *substream, int state); 819 int (*do_action)(struct snd_pcm_substream *substream, int state); 820 void (*undo_action)(struct snd_pcm_substream *substream, int state); 821 void (*post_action)(struct snd_pcm_substream *substream, int state); 822 }; 823 824 /* 825 * this functions is core for handling of linked stream 826 * Note: the stream state might be changed also on failure 827 * Note2: call with calling stream lock + link lock 828 */ 829 static int snd_pcm_action_group(struct action_ops *ops, 830 struct snd_pcm_substream *substream, 831 int state, int do_lock) 832 { 833 struct snd_pcm_substream *s = NULL; 834 struct snd_pcm_substream *s1; 835 int res = 0, depth = 1; 836 837 snd_pcm_group_for_each_entry(s, substream) { 838 if (do_lock && s != substream) { 839 if (s->pcm->nonatomic) 840 mutex_lock_nested(&s->self_group.mutex, depth); 841 else 842 spin_lock_nested(&s->self_group.lock, depth); 843 depth++; 844 } 845 res = ops->pre_action(s, state); 846 if (res < 0) 847 goto _unlock; 848 } 849 snd_pcm_group_for_each_entry(s, substream) { 850 res = ops->do_action(s, state); 851 if (res < 0) { 852 if (ops->undo_action) { 853 snd_pcm_group_for_each_entry(s1, substream) { 854 if (s1 == s) /* failed stream */ 855 break; 856 ops->undo_action(s1, state); 857 } 858 } 859 s = NULL; /* unlock all */ 860 goto _unlock; 861 } 862 } 863 snd_pcm_group_for_each_entry(s, substream) { 864 ops->post_action(s, state); 865 } 866 _unlock: 867 if (do_lock) { 868 /* unlock streams */ 869 snd_pcm_group_for_each_entry(s1, substream) { 870 if (s1 != substream) { 871 if (s1->pcm->nonatomic) 872 mutex_unlock(&s1->self_group.mutex); 873 else 874 spin_unlock(&s1->self_group.lock); 875 } 876 if (s1 == s) /* end */ 877 break; 878 } 879 } 880 return res; 881 } 882 883 /* 884 * Note: call with stream lock 885 */ 886 static int snd_pcm_action_single(struct action_ops *ops, 887 struct snd_pcm_substream *substream, 888 int state) 889 { 890 int res; 891 892 res = ops->pre_action(substream, state); 893 if (res < 0) 894 return res; 895 res = ops->do_action(substream, state); 896 if (res == 0) 897 ops->post_action(substream, state); 898 else if (ops->undo_action) 899 ops->undo_action(substream, state); 900 return res; 901 } 902 903 /* 904 * Note: call with stream lock 905 */ 906 static int snd_pcm_action(struct action_ops *ops, 907 struct snd_pcm_substream *substream, 908 int state) 909 { 910 int res; 911 912 if (!snd_pcm_stream_linked(substream)) 913 return snd_pcm_action_single(ops, substream, state); 914 915 if (substream->pcm->nonatomic) { 916 if (!mutex_trylock(&substream->group->mutex)) { 917 mutex_unlock(&substream->self_group.mutex); 918 mutex_lock(&substream->group->mutex); 919 mutex_lock(&substream->self_group.mutex); 920 } 921 res = snd_pcm_action_group(ops, substream, state, 1); 922 mutex_unlock(&substream->group->mutex); 923 } else { 924 if (!spin_trylock(&substream->group->lock)) { 925 spin_unlock(&substream->self_group.lock); 926 spin_lock(&substream->group->lock); 927 spin_lock(&substream->self_group.lock); 928 } 929 res = snd_pcm_action_group(ops, substream, state, 1); 930 spin_unlock(&substream->group->lock); 931 } 932 return res; 933 } 934 935 /* 936 * Note: don't use any locks before 937 */ 938 static int snd_pcm_action_lock_irq(struct action_ops *ops, 939 struct snd_pcm_substream *substream, 940 int state) 941 { 942 int res; 943 944 snd_pcm_stream_lock_irq(substream); 945 res = snd_pcm_action(ops, substream, state); 946 snd_pcm_stream_unlock_irq(substream); 947 return res; 948 } 949 950 /* 951 */ 952 static int snd_pcm_action_nonatomic(struct action_ops *ops, 953 struct snd_pcm_substream *substream, 954 int state) 955 { 956 int res; 957 958 down_read(&snd_pcm_link_rwsem); 959 if (snd_pcm_stream_linked(substream)) 960 res = snd_pcm_action_group(ops, substream, state, 0); 961 else 962 res = snd_pcm_action_single(ops, substream, state); 963 up_read(&snd_pcm_link_rwsem); 964 return res; 965 } 966 967 /* 968 * start callbacks 969 */ 970 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 971 { 972 struct snd_pcm_runtime *runtime = substream->runtime; 973 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 974 return -EBADFD; 975 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 976 !snd_pcm_playback_data(substream)) 977 return -EPIPE; 978 runtime->trigger_master = substream; 979 return 0; 980 } 981 982 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 983 { 984 if (substream->runtime->trigger_master != substream) 985 return 0; 986 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 987 } 988 989 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 990 { 991 if (substream->runtime->trigger_master == substream) 992 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 993 } 994 995 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 996 { 997 struct snd_pcm_runtime *runtime = substream->runtime; 998 snd_pcm_trigger_tstamp(substream); 999 runtime->hw_ptr_jiffies = jiffies; 1000 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1001 runtime->rate; 1002 runtime->status->state = state; 1003 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1004 runtime->silence_size > 0) 1005 snd_pcm_playback_silence(substream, ULONG_MAX); 1006 if (substream->timer) 1007 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART, 1008 &runtime->trigger_tstamp); 1009 } 1010 1011 static struct action_ops snd_pcm_action_start = { 1012 .pre_action = snd_pcm_pre_start, 1013 .do_action = snd_pcm_do_start, 1014 .undo_action = snd_pcm_undo_start, 1015 .post_action = snd_pcm_post_start 1016 }; 1017 1018 /** 1019 * snd_pcm_start - start all linked streams 1020 * @substream: the PCM substream instance 1021 * 1022 * Return: Zero if successful, or a negative error code. 1023 */ 1024 int snd_pcm_start(struct snd_pcm_substream *substream) 1025 { 1026 return snd_pcm_action(&snd_pcm_action_start, substream, 1027 SNDRV_PCM_STATE_RUNNING); 1028 } 1029 1030 /* 1031 * stop callbacks 1032 */ 1033 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1034 { 1035 struct snd_pcm_runtime *runtime = substream->runtime; 1036 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1037 return -EBADFD; 1038 runtime->trigger_master = substream; 1039 return 0; 1040 } 1041 1042 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1043 { 1044 if (substream->runtime->trigger_master == substream && 1045 snd_pcm_running(substream)) 1046 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1047 return 0; /* unconditonally stop all substreams */ 1048 } 1049 1050 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1051 { 1052 struct snd_pcm_runtime *runtime = substream->runtime; 1053 if (runtime->status->state != state) { 1054 snd_pcm_trigger_tstamp(substream); 1055 runtime->status->state = state; 1056 if (substream->timer) 1057 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP, 1058 &runtime->trigger_tstamp); 1059 } 1060 wake_up(&runtime->sleep); 1061 wake_up(&runtime->tsleep); 1062 } 1063 1064 static struct action_ops snd_pcm_action_stop = { 1065 .pre_action = snd_pcm_pre_stop, 1066 .do_action = snd_pcm_do_stop, 1067 .post_action = snd_pcm_post_stop 1068 }; 1069 1070 /** 1071 * snd_pcm_stop - try to stop all running streams in the substream group 1072 * @substream: the PCM substream instance 1073 * @state: PCM state after stopping the stream 1074 * 1075 * The state of each stream is then changed to the given state unconditionally. 1076 * 1077 * Return: Zero if successful, or a negative error code. 1078 */ 1079 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1080 { 1081 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1082 } 1083 1084 EXPORT_SYMBOL(snd_pcm_stop); 1085 1086 /** 1087 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1088 * @substream: the PCM substream 1089 * 1090 * After stopping, the state is changed to SETUP. 1091 * Unlike snd_pcm_stop(), this affects only the given stream. 1092 * 1093 * Return: Zero if succesful, or a negative error code. 1094 */ 1095 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1096 { 1097 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1098 SNDRV_PCM_STATE_SETUP); 1099 } 1100 1101 /** 1102 * snd_pcm_stop_xrun - stop the running streams as XRUN 1103 * @substream: the PCM substream instance 1104 * 1105 * This stops the given running substream (and all linked substreams) as XRUN. 1106 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1107 * 1108 * Return: Zero if successful, or a negative error code. 1109 */ 1110 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1111 { 1112 unsigned long flags; 1113 int ret = 0; 1114 1115 snd_pcm_stream_lock_irqsave(substream, flags); 1116 if (snd_pcm_running(substream)) 1117 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1118 snd_pcm_stream_unlock_irqrestore(substream, flags); 1119 return ret; 1120 } 1121 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1122 1123 /* 1124 * pause callbacks 1125 */ 1126 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1127 { 1128 struct snd_pcm_runtime *runtime = substream->runtime; 1129 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1130 return -ENOSYS; 1131 if (push) { 1132 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1133 return -EBADFD; 1134 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1135 return -EBADFD; 1136 runtime->trigger_master = substream; 1137 return 0; 1138 } 1139 1140 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1141 { 1142 if (substream->runtime->trigger_master != substream) 1143 return 0; 1144 /* some drivers might use hw_ptr to recover from the pause - 1145 update the hw_ptr now */ 1146 if (push) 1147 snd_pcm_update_hw_ptr(substream); 1148 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1149 * a delta between the current jiffies, this gives a large enough 1150 * delta, effectively to skip the check once. 1151 */ 1152 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1153 return substream->ops->trigger(substream, 1154 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1155 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1156 } 1157 1158 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1159 { 1160 if (substream->runtime->trigger_master == substream) 1161 substream->ops->trigger(substream, 1162 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1163 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1164 } 1165 1166 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1167 { 1168 struct snd_pcm_runtime *runtime = substream->runtime; 1169 snd_pcm_trigger_tstamp(substream); 1170 if (push) { 1171 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1172 if (substream->timer) 1173 snd_timer_notify(substream->timer, 1174 SNDRV_TIMER_EVENT_MPAUSE, 1175 &runtime->trigger_tstamp); 1176 wake_up(&runtime->sleep); 1177 wake_up(&runtime->tsleep); 1178 } else { 1179 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1180 if (substream->timer) 1181 snd_timer_notify(substream->timer, 1182 SNDRV_TIMER_EVENT_MCONTINUE, 1183 &runtime->trigger_tstamp); 1184 } 1185 } 1186 1187 static struct action_ops snd_pcm_action_pause = { 1188 .pre_action = snd_pcm_pre_pause, 1189 .do_action = snd_pcm_do_pause, 1190 .undo_action = snd_pcm_undo_pause, 1191 .post_action = snd_pcm_post_pause 1192 }; 1193 1194 /* 1195 * Push/release the pause for all linked streams. 1196 */ 1197 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1198 { 1199 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1200 } 1201 1202 #ifdef CONFIG_PM 1203 /* suspend */ 1204 1205 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1206 { 1207 struct snd_pcm_runtime *runtime = substream->runtime; 1208 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1209 return -EBUSY; 1210 runtime->trigger_master = substream; 1211 return 0; 1212 } 1213 1214 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1215 { 1216 struct snd_pcm_runtime *runtime = substream->runtime; 1217 if (runtime->trigger_master != substream) 1218 return 0; 1219 if (! snd_pcm_running(substream)) 1220 return 0; 1221 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1222 return 0; /* suspend unconditionally */ 1223 } 1224 1225 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1226 { 1227 struct snd_pcm_runtime *runtime = substream->runtime; 1228 snd_pcm_trigger_tstamp(substream); 1229 runtime->status->suspended_state = runtime->status->state; 1230 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1231 if (substream->timer) 1232 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND, 1233 &runtime->trigger_tstamp); 1234 wake_up(&runtime->sleep); 1235 wake_up(&runtime->tsleep); 1236 } 1237 1238 static struct action_ops snd_pcm_action_suspend = { 1239 .pre_action = snd_pcm_pre_suspend, 1240 .do_action = snd_pcm_do_suspend, 1241 .post_action = snd_pcm_post_suspend 1242 }; 1243 1244 /** 1245 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1246 * @substream: the PCM substream 1247 * 1248 * After this call, all streams are changed to SUSPENDED state. 1249 * 1250 * Return: Zero if successful (or @substream is %NULL), or a negative error 1251 * code. 1252 */ 1253 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1254 { 1255 int err; 1256 unsigned long flags; 1257 1258 if (! substream) 1259 return 0; 1260 1261 snd_pcm_stream_lock_irqsave(substream, flags); 1262 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1263 snd_pcm_stream_unlock_irqrestore(substream, flags); 1264 return err; 1265 } 1266 1267 EXPORT_SYMBOL(snd_pcm_suspend); 1268 1269 /** 1270 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1271 * @pcm: the PCM instance 1272 * 1273 * After this call, all streams are changed to SUSPENDED state. 1274 * 1275 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1276 */ 1277 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1278 { 1279 struct snd_pcm_substream *substream; 1280 int stream, err = 0; 1281 1282 if (! pcm) 1283 return 0; 1284 1285 for (stream = 0; stream < 2; stream++) { 1286 for (substream = pcm->streams[stream].substream; 1287 substream; substream = substream->next) { 1288 /* FIXME: the open/close code should lock this as well */ 1289 if (substream->runtime == NULL) 1290 continue; 1291 err = snd_pcm_suspend(substream); 1292 if (err < 0 && err != -EBUSY) 1293 return err; 1294 } 1295 } 1296 return 0; 1297 } 1298 1299 EXPORT_SYMBOL(snd_pcm_suspend_all); 1300 1301 /* resume */ 1302 1303 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1304 { 1305 struct snd_pcm_runtime *runtime = substream->runtime; 1306 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1307 return -ENOSYS; 1308 runtime->trigger_master = substream; 1309 return 0; 1310 } 1311 1312 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1313 { 1314 struct snd_pcm_runtime *runtime = substream->runtime; 1315 if (runtime->trigger_master != substream) 1316 return 0; 1317 /* DMA not running previously? */ 1318 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1319 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1320 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1321 return 0; 1322 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1323 } 1324 1325 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1326 { 1327 if (substream->runtime->trigger_master == substream && 1328 snd_pcm_running(substream)) 1329 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1330 } 1331 1332 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1333 { 1334 struct snd_pcm_runtime *runtime = substream->runtime; 1335 snd_pcm_trigger_tstamp(substream); 1336 runtime->status->state = runtime->status->suspended_state; 1337 if (substream->timer) 1338 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME, 1339 &runtime->trigger_tstamp); 1340 } 1341 1342 static struct action_ops snd_pcm_action_resume = { 1343 .pre_action = snd_pcm_pre_resume, 1344 .do_action = snd_pcm_do_resume, 1345 .undo_action = snd_pcm_undo_resume, 1346 .post_action = snd_pcm_post_resume 1347 }; 1348 1349 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1350 { 1351 struct snd_card *card = substream->pcm->card; 1352 int res; 1353 1354 snd_power_lock(card); 1355 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1356 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1357 snd_power_unlock(card); 1358 return res; 1359 } 1360 1361 #else 1362 1363 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1364 { 1365 return -ENOSYS; 1366 } 1367 1368 #endif /* CONFIG_PM */ 1369 1370 /* 1371 * xrun ioctl 1372 * 1373 * Change the RUNNING stream(s) to XRUN state. 1374 */ 1375 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1376 { 1377 struct snd_card *card = substream->pcm->card; 1378 struct snd_pcm_runtime *runtime = substream->runtime; 1379 int result; 1380 1381 snd_power_lock(card); 1382 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1383 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1384 if (result < 0) 1385 goto _unlock; 1386 } 1387 1388 snd_pcm_stream_lock_irq(substream); 1389 switch (runtime->status->state) { 1390 case SNDRV_PCM_STATE_XRUN: 1391 result = 0; /* already there */ 1392 break; 1393 case SNDRV_PCM_STATE_RUNNING: 1394 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1395 break; 1396 default: 1397 result = -EBADFD; 1398 } 1399 snd_pcm_stream_unlock_irq(substream); 1400 _unlock: 1401 snd_power_unlock(card); 1402 return result; 1403 } 1404 1405 /* 1406 * reset ioctl 1407 */ 1408 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1409 { 1410 struct snd_pcm_runtime *runtime = substream->runtime; 1411 switch (runtime->status->state) { 1412 case SNDRV_PCM_STATE_RUNNING: 1413 case SNDRV_PCM_STATE_PREPARED: 1414 case SNDRV_PCM_STATE_PAUSED: 1415 case SNDRV_PCM_STATE_SUSPENDED: 1416 return 0; 1417 default: 1418 return -EBADFD; 1419 } 1420 } 1421 1422 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1423 { 1424 struct snd_pcm_runtime *runtime = substream->runtime; 1425 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1426 if (err < 0) 1427 return err; 1428 runtime->hw_ptr_base = 0; 1429 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1430 runtime->status->hw_ptr % runtime->period_size; 1431 runtime->silence_start = runtime->status->hw_ptr; 1432 runtime->silence_filled = 0; 1433 return 0; 1434 } 1435 1436 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1437 { 1438 struct snd_pcm_runtime *runtime = substream->runtime; 1439 runtime->control->appl_ptr = runtime->status->hw_ptr; 1440 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1441 runtime->silence_size > 0) 1442 snd_pcm_playback_silence(substream, ULONG_MAX); 1443 } 1444 1445 static struct action_ops snd_pcm_action_reset = { 1446 .pre_action = snd_pcm_pre_reset, 1447 .do_action = snd_pcm_do_reset, 1448 .post_action = snd_pcm_post_reset 1449 }; 1450 1451 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1452 { 1453 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1454 } 1455 1456 /* 1457 * prepare ioctl 1458 */ 1459 /* we use the second argument for updating f_flags */ 1460 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1461 int f_flags) 1462 { 1463 struct snd_pcm_runtime *runtime = substream->runtime; 1464 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1465 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1466 return -EBADFD; 1467 if (snd_pcm_running(substream)) 1468 return -EBUSY; 1469 substream->f_flags = f_flags; 1470 return 0; 1471 } 1472 1473 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1474 { 1475 int err; 1476 err = substream->ops->prepare(substream); 1477 if (err < 0) 1478 return err; 1479 return snd_pcm_do_reset(substream, 0); 1480 } 1481 1482 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1483 { 1484 struct snd_pcm_runtime *runtime = substream->runtime; 1485 runtime->control->appl_ptr = runtime->status->hw_ptr; 1486 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1487 } 1488 1489 static struct action_ops snd_pcm_action_prepare = { 1490 .pre_action = snd_pcm_pre_prepare, 1491 .do_action = snd_pcm_do_prepare, 1492 .post_action = snd_pcm_post_prepare 1493 }; 1494 1495 /** 1496 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1497 * @substream: the PCM substream instance 1498 * @file: file to refer f_flags 1499 * 1500 * Return: Zero if successful, or a negative error code. 1501 */ 1502 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1503 struct file *file) 1504 { 1505 int res; 1506 struct snd_card *card = substream->pcm->card; 1507 int f_flags; 1508 1509 if (file) 1510 f_flags = file->f_flags; 1511 else 1512 f_flags = substream->f_flags; 1513 1514 snd_power_lock(card); 1515 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1516 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1517 substream, f_flags); 1518 snd_power_unlock(card); 1519 return res; 1520 } 1521 1522 /* 1523 * drain ioctl 1524 */ 1525 1526 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1527 { 1528 struct snd_pcm_runtime *runtime = substream->runtime; 1529 switch (runtime->status->state) { 1530 case SNDRV_PCM_STATE_OPEN: 1531 case SNDRV_PCM_STATE_DISCONNECTED: 1532 case SNDRV_PCM_STATE_SUSPENDED: 1533 return -EBADFD; 1534 } 1535 runtime->trigger_master = substream; 1536 return 0; 1537 } 1538 1539 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1540 { 1541 struct snd_pcm_runtime *runtime = substream->runtime; 1542 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1543 switch (runtime->status->state) { 1544 case SNDRV_PCM_STATE_PREPARED: 1545 /* start playback stream if possible */ 1546 if (! snd_pcm_playback_empty(substream)) { 1547 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1548 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1549 } 1550 break; 1551 case SNDRV_PCM_STATE_RUNNING: 1552 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1553 break; 1554 case SNDRV_PCM_STATE_XRUN: 1555 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1556 break; 1557 default: 1558 break; 1559 } 1560 } else { 1561 /* stop running stream */ 1562 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1563 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1564 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1565 snd_pcm_do_stop(substream, new_state); 1566 snd_pcm_post_stop(substream, new_state); 1567 } 1568 } 1569 return 0; 1570 } 1571 1572 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1573 { 1574 } 1575 1576 static struct action_ops snd_pcm_action_drain_init = { 1577 .pre_action = snd_pcm_pre_drain_init, 1578 .do_action = snd_pcm_do_drain_init, 1579 .post_action = snd_pcm_post_drain_init 1580 }; 1581 1582 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1583 1584 /* 1585 * Drain the stream(s). 1586 * When the substream is linked, sync until the draining of all playback streams 1587 * is finished. 1588 * After this call, all streams are supposed to be either SETUP or DRAINING 1589 * (capture only) state. 1590 */ 1591 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1592 struct file *file) 1593 { 1594 struct snd_card *card; 1595 struct snd_pcm_runtime *runtime; 1596 struct snd_pcm_substream *s; 1597 wait_queue_t wait; 1598 int result = 0; 1599 int nonblock = 0; 1600 1601 card = substream->pcm->card; 1602 runtime = substream->runtime; 1603 1604 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1605 return -EBADFD; 1606 1607 snd_power_lock(card); 1608 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1609 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1610 if (result < 0) { 1611 snd_power_unlock(card); 1612 return result; 1613 } 1614 } 1615 1616 if (file) { 1617 if (file->f_flags & O_NONBLOCK) 1618 nonblock = 1; 1619 } else if (substream->f_flags & O_NONBLOCK) 1620 nonblock = 1; 1621 1622 down_read(&snd_pcm_link_rwsem); 1623 snd_pcm_stream_lock_irq(substream); 1624 /* resume pause */ 1625 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1626 snd_pcm_pause(substream, 0); 1627 1628 /* pre-start/stop - all running streams are changed to DRAINING state */ 1629 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1630 if (result < 0) 1631 goto unlock; 1632 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1633 if (nonblock) { 1634 result = -EAGAIN; 1635 goto unlock; 1636 } 1637 1638 for (;;) { 1639 long tout; 1640 struct snd_pcm_runtime *to_check; 1641 if (signal_pending(current)) { 1642 result = -ERESTARTSYS; 1643 break; 1644 } 1645 /* find a substream to drain */ 1646 to_check = NULL; 1647 snd_pcm_group_for_each_entry(s, substream) { 1648 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1649 continue; 1650 runtime = s->runtime; 1651 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1652 to_check = runtime; 1653 break; 1654 } 1655 } 1656 if (!to_check) 1657 break; /* all drained */ 1658 init_waitqueue_entry(&wait, current); 1659 add_wait_queue(&to_check->sleep, &wait); 1660 snd_pcm_stream_unlock_irq(substream); 1661 up_read(&snd_pcm_link_rwsem); 1662 snd_power_unlock(card); 1663 if (runtime->no_period_wakeup) 1664 tout = MAX_SCHEDULE_TIMEOUT; 1665 else { 1666 tout = 10; 1667 if (runtime->rate) { 1668 long t = runtime->period_size * 2 / runtime->rate; 1669 tout = max(t, tout); 1670 } 1671 tout = msecs_to_jiffies(tout * 1000); 1672 } 1673 tout = schedule_timeout_interruptible(tout); 1674 snd_power_lock(card); 1675 down_read(&snd_pcm_link_rwsem); 1676 snd_pcm_stream_lock_irq(substream); 1677 remove_wait_queue(&to_check->sleep, &wait); 1678 if (card->shutdown) { 1679 result = -ENODEV; 1680 break; 1681 } 1682 if (tout == 0) { 1683 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1684 result = -ESTRPIPE; 1685 else { 1686 dev_dbg(substream->pcm->card->dev, 1687 "playback drain error (DMA or IRQ trouble?)\n"); 1688 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1689 result = -EIO; 1690 } 1691 break; 1692 } 1693 } 1694 1695 unlock: 1696 snd_pcm_stream_unlock_irq(substream); 1697 up_read(&snd_pcm_link_rwsem); 1698 snd_power_unlock(card); 1699 1700 return result; 1701 } 1702 1703 /* 1704 * drop ioctl 1705 * 1706 * Immediately put all linked substreams into SETUP state. 1707 */ 1708 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1709 { 1710 struct snd_pcm_runtime *runtime; 1711 int result = 0; 1712 1713 if (PCM_RUNTIME_CHECK(substream)) 1714 return -ENXIO; 1715 runtime = substream->runtime; 1716 1717 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1718 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1719 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1720 return -EBADFD; 1721 1722 snd_pcm_stream_lock_irq(substream); 1723 /* resume pause */ 1724 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1725 snd_pcm_pause(substream, 0); 1726 1727 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1728 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1729 snd_pcm_stream_unlock_irq(substream); 1730 1731 return result; 1732 } 1733 1734 1735 static bool is_pcm_file(struct file *file) 1736 { 1737 struct inode *inode = file_inode(file); 1738 unsigned int minor; 1739 1740 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1741 return false; 1742 minor = iminor(inode); 1743 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1744 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1745 } 1746 1747 /* 1748 * PCM link handling 1749 */ 1750 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1751 { 1752 int res = 0; 1753 struct snd_pcm_file *pcm_file; 1754 struct snd_pcm_substream *substream1; 1755 struct snd_pcm_group *group; 1756 struct fd f = fdget(fd); 1757 1758 if (!f.file) 1759 return -EBADFD; 1760 if (!is_pcm_file(f.file)) { 1761 res = -EBADFD; 1762 goto _badf; 1763 } 1764 pcm_file = f.file->private_data; 1765 substream1 = pcm_file->substream; 1766 group = kmalloc(sizeof(*group), GFP_KERNEL); 1767 if (!group) { 1768 res = -ENOMEM; 1769 goto _nolock; 1770 } 1771 down_write(&snd_pcm_link_rwsem); 1772 write_lock_irq(&snd_pcm_link_rwlock); 1773 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1774 substream->runtime->status->state != substream1->runtime->status->state || 1775 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1776 res = -EBADFD; 1777 goto _end; 1778 } 1779 if (snd_pcm_stream_linked(substream1)) { 1780 res = -EALREADY; 1781 goto _end; 1782 } 1783 if (!snd_pcm_stream_linked(substream)) { 1784 substream->group = group; 1785 group = NULL; 1786 spin_lock_init(&substream->group->lock); 1787 mutex_init(&substream->group->mutex); 1788 INIT_LIST_HEAD(&substream->group->substreams); 1789 list_add_tail(&substream->link_list, &substream->group->substreams); 1790 substream->group->count = 1; 1791 } 1792 list_add_tail(&substream1->link_list, &substream->group->substreams); 1793 substream->group->count++; 1794 substream1->group = substream->group; 1795 _end: 1796 write_unlock_irq(&snd_pcm_link_rwlock); 1797 up_write(&snd_pcm_link_rwsem); 1798 _nolock: 1799 snd_card_unref(substream1->pcm->card); 1800 kfree(group); 1801 _badf: 1802 fdput(f); 1803 return res; 1804 } 1805 1806 static void relink_to_local(struct snd_pcm_substream *substream) 1807 { 1808 substream->group = &substream->self_group; 1809 INIT_LIST_HEAD(&substream->self_group.substreams); 1810 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1811 } 1812 1813 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1814 { 1815 struct snd_pcm_substream *s; 1816 int res = 0; 1817 1818 down_write(&snd_pcm_link_rwsem); 1819 write_lock_irq(&snd_pcm_link_rwlock); 1820 if (!snd_pcm_stream_linked(substream)) { 1821 res = -EALREADY; 1822 goto _end; 1823 } 1824 list_del(&substream->link_list); 1825 substream->group->count--; 1826 if (substream->group->count == 1) { /* detach the last stream, too */ 1827 snd_pcm_group_for_each_entry(s, substream) { 1828 relink_to_local(s); 1829 break; 1830 } 1831 kfree(substream->group); 1832 } 1833 relink_to_local(substream); 1834 _end: 1835 write_unlock_irq(&snd_pcm_link_rwlock); 1836 up_write(&snd_pcm_link_rwsem); 1837 return res; 1838 } 1839 1840 /* 1841 * hw configurator 1842 */ 1843 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1844 struct snd_pcm_hw_rule *rule) 1845 { 1846 struct snd_interval t; 1847 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1848 hw_param_interval_c(params, rule->deps[1]), &t); 1849 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1850 } 1851 1852 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1853 struct snd_pcm_hw_rule *rule) 1854 { 1855 struct snd_interval t; 1856 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1857 hw_param_interval_c(params, rule->deps[1]), &t); 1858 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1859 } 1860 1861 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1862 struct snd_pcm_hw_rule *rule) 1863 { 1864 struct snd_interval t; 1865 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1866 hw_param_interval_c(params, rule->deps[1]), 1867 (unsigned long) rule->private, &t); 1868 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1869 } 1870 1871 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1872 struct snd_pcm_hw_rule *rule) 1873 { 1874 struct snd_interval t; 1875 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1876 (unsigned long) rule->private, 1877 hw_param_interval_c(params, rule->deps[1]), &t); 1878 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1879 } 1880 1881 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1882 struct snd_pcm_hw_rule *rule) 1883 { 1884 unsigned int k; 1885 struct snd_interval *i = hw_param_interval(params, rule->deps[0]); 1886 struct snd_mask m; 1887 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1888 snd_mask_any(&m); 1889 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1890 int bits; 1891 if (! snd_mask_test(mask, k)) 1892 continue; 1893 bits = snd_pcm_format_physical_width(k); 1894 if (bits <= 0) 1895 continue; /* ignore invalid formats */ 1896 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1897 snd_mask_reset(&m, k); 1898 } 1899 return snd_mask_refine(mask, &m); 1900 } 1901 1902 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1903 struct snd_pcm_hw_rule *rule) 1904 { 1905 struct snd_interval t; 1906 unsigned int k; 1907 t.min = UINT_MAX; 1908 t.max = 0; 1909 t.openmin = 0; 1910 t.openmax = 0; 1911 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1912 int bits; 1913 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1914 continue; 1915 bits = snd_pcm_format_physical_width(k); 1916 if (bits <= 0) 1917 continue; /* ignore invalid formats */ 1918 if (t.min > (unsigned)bits) 1919 t.min = bits; 1920 if (t.max < (unsigned)bits) 1921 t.max = bits; 1922 } 1923 t.integer = 1; 1924 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1925 } 1926 1927 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1928 #error "Change this table" 1929 #endif 1930 1931 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1932 48000, 64000, 88200, 96000, 176400, 192000 }; 1933 1934 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1935 .count = ARRAY_SIZE(rates), 1936 .list = rates, 1937 }; 1938 1939 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1940 struct snd_pcm_hw_rule *rule) 1941 { 1942 struct snd_pcm_hardware *hw = rule->private; 1943 return snd_interval_list(hw_param_interval(params, rule->var), 1944 snd_pcm_known_rates.count, 1945 snd_pcm_known_rates.list, hw->rates); 1946 } 1947 1948 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1949 struct snd_pcm_hw_rule *rule) 1950 { 1951 struct snd_interval t; 1952 struct snd_pcm_substream *substream = rule->private; 1953 t.min = 0; 1954 t.max = substream->buffer_bytes_max; 1955 t.openmin = 0; 1956 t.openmax = 0; 1957 t.integer = 1; 1958 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1959 } 1960 1961 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 1962 { 1963 struct snd_pcm_runtime *runtime = substream->runtime; 1964 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1965 int k, err; 1966 1967 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 1968 snd_mask_any(constrs_mask(constrs, k)); 1969 } 1970 1971 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 1972 snd_interval_any(constrs_interval(constrs, k)); 1973 } 1974 1975 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 1976 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 1977 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 1978 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 1979 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 1980 1981 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1982 snd_pcm_hw_rule_format, NULL, 1983 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1984 if (err < 0) 1985 return err; 1986 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1987 snd_pcm_hw_rule_sample_bits, NULL, 1988 SNDRV_PCM_HW_PARAM_FORMAT, 1989 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1990 if (err < 0) 1991 return err; 1992 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1993 snd_pcm_hw_rule_div, NULL, 1994 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1995 if (err < 0) 1996 return err; 1997 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1998 snd_pcm_hw_rule_mul, NULL, 1999 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2000 if (err < 0) 2001 return err; 2002 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2003 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2004 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2005 if (err < 0) 2006 return err; 2007 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2008 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2009 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2010 if (err < 0) 2011 return err; 2012 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2013 snd_pcm_hw_rule_div, NULL, 2014 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2015 if (err < 0) 2016 return err; 2017 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2018 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2019 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2020 if (err < 0) 2021 return err; 2022 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2023 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2024 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2025 if (err < 0) 2026 return err; 2027 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2028 snd_pcm_hw_rule_div, NULL, 2029 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2030 if (err < 0) 2031 return err; 2032 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2033 snd_pcm_hw_rule_div, NULL, 2034 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2035 if (err < 0) 2036 return err; 2037 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2038 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2039 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2040 if (err < 0) 2041 return err; 2042 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2043 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2044 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2045 if (err < 0) 2046 return err; 2047 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2048 snd_pcm_hw_rule_mul, NULL, 2049 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2050 if (err < 0) 2051 return err; 2052 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2053 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2054 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2055 if (err < 0) 2056 return err; 2057 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2058 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2059 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2060 if (err < 0) 2061 return err; 2062 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2063 snd_pcm_hw_rule_muldivk, (void*) 8, 2064 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2065 if (err < 0) 2066 return err; 2067 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2068 snd_pcm_hw_rule_muldivk, (void*) 8, 2069 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2070 if (err < 0) 2071 return err; 2072 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2073 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2074 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2075 if (err < 0) 2076 return err; 2077 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2078 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2079 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2080 if (err < 0) 2081 return err; 2082 return 0; 2083 } 2084 2085 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2086 { 2087 struct snd_pcm_runtime *runtime = substream->runtime; 2088 struct snd_pcm_hardware *hw = &runtime->hw; 2089 int err; 2090 unsigned int mask = 0; 2091 2092 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2093 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2094 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2095 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2096 if (hw_support_mmap(substream)) { 2097 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2098 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2099 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2100 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2101 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2102 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2103 } 2104 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2105 if (err < 0) 2106 return err; 2107 2108 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2109 if (err < 0) 2110 return err; 2111 2112 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2113 if (err < 0) 2114 return err; 2115 2116 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2117 hw->channels_min, hw->channels_max); 2118 if (err < 0) 2119 return err; 2120 2121 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2122 hw->rate_min, hw->rate_max); 2123 if (err < 0) 2124 return err; 2125 2126 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2127 hw->period_bytes_min, hw->period_bytes_max); 2128 if (err < 0) 2129 return err; 2130 2131 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2132 hw->periods_min, hw->periods_max); 2133 if (err < 0) 2134 return err; 2135 2136 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2137 hw->period_bytes_min, hw->buffer_bytes_max); 2138 if (err < 0) 2139 return err; 2140 2141 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2142 snd_pcm_hw_rule_buffer_bytes_max, substream, 2143 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2144 if (err < 0) 2145 return err; 2146 2147 /* FIXME: remove */ 2148 if (runtime->dma_bytes) { 2149 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2150 if (err < 0) 2151 return err; 2152 } 2153 2154 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2155 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2156 snd_pcm_hw_rule_rate, hw, 2157 SNDRV_PCM_HW_PARAM_RATE, -1); 2158 if (err < 0) 2159 return err; 2160 } 2161 2162 /* FIXME: this belong to lowlevel */ 2163 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2164 2165 return 0; 2166 } 2167 2168 static void pcm_release_private(struct snd_pcm_substream *substream) 2169 { 2170 snd_pcm_unlink(substream); 2171 } 2172 2173 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2174 { 2175 substream->ref_count--; 2176 if (substream->ref_count > 0) 2177 return; 2178 2179 snd_pcm_drop(substream); 2180 if (substream->hw_opened) { 2181 if (substream->ops->hw_free != NULL) 2182 substream->ops->hw_free(substream); 2183 substream->ops->close(substream); 2184 substream->hw_opened = 0; 2185 } 2186 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2187 pm_qos_remove_request(&substream->latency_pm_qos_req); 2188 if (substream->pcm_release) { 2189 substream->pcm_release(substream); 2190 substream->pcm_release = NULL; 2191 } 2192 snd_pcm_detach_substream(substream); 2193 } 2194 2195 EXPORT_SYMBOL(snd_pcm_release_substream); 2196 2197 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2198 struct file *file, 2199 struct snd_pcm_substream **rsubstream) 2200 { 2201 struct snd_pcm_substream *substream; 2202 int err; 2203 2204 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2205 if (err < 0) 2206 return err; 2207 if (substream->ref_count > 1) { 2208 *rsubstream = substream; 2209 return 0; 2210 } 2211 2212 err = snd_pcm_hw_constraints_init(substream); 2213 if (err < 0) { 2214 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2215 goto error; 2216 } 2217 2218 if ((err = substream->ops->open(substream)) < 0) 2219 goto error; 2220 2221 substream->hw_opened = 1; 2222 2223 err = snd_pcm_hw_constraints_complete(substream); 2224 if (err < 0) { 2225 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2226 goto error; 2227 } 2228 2229 *rsubstream = substream; 2230 return 0; 2231 2232 error: 2233 snd_pcm_release_substream(substream); 2234 return err; 2235 } 2236 2237 EXPORT_SYMBOL(snd_pcm_open_substream); 2238 2239 static int snd_pcm_open_file(struct file *file, 2240 struct snd_pcm *pcm, 2241 int stream) 2242 { 2243 struct snd_pcm_file *pcm_file; 2244 struct snd_pcm_substream *substream; 2245 int err; 2246 2247 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2248 if (err < 0) 2249 return err; 2250 2251 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2252 if (pcm_file == NULL) { 2253 snd_pcm_release_substream(substream); 2254 return -ENOMEM; 2255 } 2256 pcm_file->substream = substream; 2257 if (substream->ref_count == 1) { 2258 substream->file = pcm_file; 2259 substream->pcm_release = pcm_release_private; 2260 } 2261 file->private_data = pcm_file; 2262 2263 return 0; 2264 } 2265 2266 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2267 { 2268 struct snd_pcm *pcm; 2269 int err = nonseekable_open(inode, file); 2270 if (err < 0) 2271 return err; 2272 pcm = snd_lookup_minor_data(iminor(inode), 2273 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2274 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2275 if (pcm) 2276 snd_card_unref(pcm->card); 2277 return err; 2278 } 2279 2280 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2281 { 2282 struct snd_pcm *pcm; 2283 int err = nonseekable_open(inode, file); 2284 if (err < 0) 2285 return err; 2286 pcm = snd_lookup_minor_data(iminor(inode), 2287 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2288 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2289 if (pcm) 2290 snd_card_unref(pcm->card); 2291 return err; 2292 } 2293 2294 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2295 { 2296 int err; 2297 wait_queue_t wait; 2298 2299 if (pcm == NULL) { 2300 err = -ENODEV; 2301 goto __error1; 2302 } 2303 err = snd_card_file_add(pcm->card, file); 2304 if (err < 0) 2305 goto __error1; 2306 if (!try_module_get(pcm->card->module)) { 2307 err = -EFAULT; 2308 goto __error2; 2309 } 2310 init_waitqueue_entry(&wait, current); 2311 add_wait_queue(&pcm->open_wait, &wait); 2312 mutex_lock(&pcm->open_mutex); 2313 while (1) { 2314 err = snd_pcm_open_file(file, pcm, stream); 2315 if (err >= 0) 2316 break; 2317 if (err == -EAGAIN) { 2318 if (file->f_flags & O_NONBLOCK) { 2319 err = -EBUSY; 2320 break; 2321 } 2322 } else 2323 break; 2324 set_current_state(TASK_INTERRUPTIBLE); 2325 mutex_unlock(&pcm->open_mutex); 2326 schedule(); 2327 mutex_lock(&pcm->open_mutex); 2328 if (pcm->card->shutdown) { 2329 err = -ENODEV; 2330 break; 2331 } 2332 if (signal_pending(current)) { 2333 err = -ERESTARTSYS; 2334 break; 2335 } 2336 } 2337 remove_wait_queue(&pcm->open_wait, &wait); 2338 mutex_unlock(&pcm->open_mutex); 2339 if (err < 0) 2340 goto __error; 2341 return err; 2342 2343 __error: 2344 module_put(pcm->card->module); 2345 __error2: 2346 snd_card_file_remove(pcm->card, file); 2347 __error1: 2348 return err; 2349 } 2350 2351 static int snd_pcm_release(struct inode *inode, struct file *file) 2352 { 2353 struct snd_pcm *pcm; 2354 struct snd_pcm_substream *substream; 2355 struct snd_pcm_file *pcm_file; 2356 2357 pcm_file = file->private_data; 2358 substream = pcm_file->substream; 2359 if (snd_BUG_ON(!substream)) 2360 return -ENXIO; 2361 pcm = substream->pcm; 2362 mutex_lock(&pcm->open_mutex); 2363 snd_pcm_release_substream(substream); 2364 kfree(pcm_file); 2365 mutex_unlock(&pcm->open_mutex); 2366 wake_up(&pcm->open_wait); 2367 module_put(pcm->card->module); 2368 snd_card_file_remove(pcm->card, file); 2369 return 0; 2370 } 2371 2372 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2373 snd_pcm_uframes_t frames) 2374 { 2375 struct snd_pcm_runtime *runtime = substream->runtime; 2376 snd_pcm_sframes_t appl_ptr; 2377 snd_pcm_sframes_t ret; 2378 snd_pcm_sframes_t hw_avail; 2379 2380 if (frames == 0) 2381 return 0; 2382 2383 snd_pcm_stream_lock_irq(substream); 2384 switch (runtime->status->state) { 2385 case SNDRV_PCM_STATE_PREPARED: 2386 break; 2387 case SNDRV_PCM_STATE_DRAINING: 2388 case SNDRV_PCM_STATE_RUNNING: 2389 if (snd_pcm_update_hw_ptr(substream) >= 0) 2390 break; 2391 /* Fall through */ 2392 case SNDRV_PCM_STATE_XRUN: 2393 ret = -EPIPE; 2394 goto __end; 2395 case SNDRV_PCM_STATE_SUSPENDED: 2396 ret = -ESTRPIPE; 2397 goto __end; 2398 default: 2399 ret = -EBADFD; 2400 goto __end; 2401 } 2402 2403 hw_avail = snd_pcm_playback_hw_avail(runtime); 2404 if (hw_avail <= 0) { 2405 ret = 0; 2406 goto __end; 2407 } 2408 if (frames > (snd_pcm_uframes_t)hw_avail) 2409 frames = hw_avail; 2410 appl_ptr = runtime->control->appl_ptr - frames; 2411 if (appl_ptr < 0) 2412 appl_ptr += runtime->boundary; 2413 runtime->control->appl_ptr = appl_ptr; 2414 ret = frames; 2415 __end: 2416 snd_pcm_stream_unlock_irq(substream); 2417 return ret; 2418 } 2419 2420 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2421 snd_pcm_uframes_t frames) 2422 { 2423 struct snd_pcm_runtime *runtime = substream->runtime; 2424 snd_pcm_sframes_t appl_ptr; 2425 snd_pcm_sframes_t ret; 2426 snd_pcm_sframes_t hw_avail; 2427 2428 if (frames == 0) 2429 return 0; 2430 2431 snd_pcm_stream_lock_irq(substream); 2432 switch (runtime->status->state) { 2433 case SNDRV_PCM_STATE_PREPARED: 2434 case SNDRV_PCM_STATE_DRAINING: 2435 break; 2436 case SNDRV_PCM_STATE_RUNNING: 2437 if (snd_pcm_update_hw_ptr(substream) >= 0) 2438 break; 2439 /* Fall through */ 2440 case SNDRV_PCM_STATE_XRUN: 2441 ret = -EPIPE; 2442 goto __end; 2443 case SNDRV_PCM_STATE_SUSPENDED: 2444 ret = -ESTRPIPE; 2445 goto __end; 2446 default: 2447 ret = -EBADFD; 2448 goto __end; 2449 } 2450 2451 hw_avail = snd_pcm_capture_hw_avail(runtime); 2452 if (hw_avail <= 0) { 2453 ret = 0; 2454 goto __end; 2455 } 2456 if (frames > (snd_pcm_uframes_t)hw_avail) 2457 frames = hw_avail; 2458 appl_ptr = runtime->control->appl_ptr - frames; 2459 if (appl_ptr < 0) 2460 appl_ptr += runtime->boundary; 2461 runtime->control->appl_ptr = appl_ptr; 2462 ret = frames; 2463 __end: 2464 snd_pcm_stream_unlock_irq(substream); 2465 return ret; 2466 } 2467 2468 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2469 snd_pcm_uframes_t frames) 2470 { 2471 struct snd_pcm_runtime *runtime = substream->runtime; 2472 snd_pcm_sframes_t appl_ptr; 2473 snd_pcm_sframes_t ret; 2474 snd_pcm_sframes_t avail; 2475 2476 if (frames == 0) 2477 return 0; 2478 2479 snd_pcm_stream_lock_irq(substream); 2480 switch (runtime->status->state) { 2481 case SNDRV_PCM_STATE_PREPARED: 2482 case SNDRV_PCM_STATE_PAUSED: 2483 break; 2484 case SNDRV_PCM_STATE_DRAINING: 2485 case SNDRV_PCM_STATE_RUNNING: 2486 if (snd_pcm_update_hw_ptr(substream) >= 0) 2487 break; 2488 /* Fall through */ 2489 case SNDRV_PCM_STATE_XRUN: 2490 ret = -EPIPE; 2491 goto __end; 2492 case SNDRV_PCM_STATE_SUSPENDED: 2493 ret = -ESTRPIPE; 2494 goto __end; 2495 default: 2496 ret = -EBADFD; 2497 goto __end; 2498 } 2499 2500 avail = snd_pcm_playback_avail(runtime); 2501 if (avail <= 0) { 2502 ret = 0; 2503 goto __end; 2504 } 2505 if (frames > (snd_pcm_uframes_t)avail) 2506 frames = avail; 2507 appl_ptr = runtime->control->appl_ptr + frames; 2508 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2509 appl_ptr -= runtime->boundary; 2510 runtime->control->appl_ptr = appl_ptr; 2511 ret = frames; 2512 __end: 2513 snd_pcm_stream_unlock_irq(substream); 2514 return ret; 2515 } 2516 2517 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2518 snd_pcm_uframes_t frames) 2519 { 2520 struct snd_pcm_runtime *runtime = substream->runtime; 2521 snd_pcm_sframes_t appl_ptr; 2522 snd_pcm_sframes_t ret; 2523 snd_pcm_sframes_t avail; 2524 2525 if (frames == 0) 2526 return 0; 2527 2528 snd_pcm_stream_lock_irq(substream); 2529 switch (runtime->status->state) { 2530 case SNDRV_PCM_STATE_PREPARED: 2531 case SNDRV_PCM_STATE_DRAINING: 2532 case SNDRV_PCM_STATE_PAUSED: 2533 break; 2534 case SNDRV_PCM_STATE_RUNNING: 2535 if (snd_pcm_update_hw_ptr(substream) >= 0) 2536 break; 2537 /* Fall through */ 2538 case SNDRV_PCM_STATE_XRUN: 2539 ret = -EPIPE; 2540 goto __end; 2541 case SNDRV_PCM_STATE_SUSPENDED: 2542 ret = -ESTRPIPE; 2543 goto __end; 2544 default: 2545 ret = -EBADFD; 2546 goto __end; 2547 } 2548 2549 avail = snd_pcm_capture_avail(runtime); 2550 if (avail <= 0) { 2551 ret = 0; 2552 goto __end; 2553 } 2554 if (frames > (snd_pcm_uframes_t)avail) 2555 frames = avail; 2556 appl_ptr = runtime->control->appl_ptr + frames; 2557 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2558 appl_ptr -= runtime->boundary; 2559 runtime->control->appl_ptr = appl_ptr; 2560 ret = frames; 2561 __end: 2562 snd_pcm_stream_unlock_irq(substream); 2563 return ret; 2564 } 2565 2566 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2567 { 2568 struct snd_pcm_runtime *runtime = substream->runtime; 2569 int err; 2570 2571 snd_pcm_stream_lock_irq(substream); 2572 switch (runtime->status->state) { 2573 case SNDRV_PCM_STATE_DRAINING: 2574 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2575 goto __badfd; 2576 /* Fall through */ 2577 case SNDRV_PCM_STATE_RUNNING: 2578 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2579 break; 2580 /* Fall through */ 2581 case SNDRV_PCM_STATE_PREPARED: 2582 case SNDRV_PCM_STATE_SUSPENDED: 2583 err = 0; 2584 break; 2585 case SNDRV_PCM_STATE_XRUN: 2586 err = -EPIPE; 2587 break; 2588 default: 2589 __badfd: 2590 err = -EBADFD; 2591 break; 2592 } 2593 snd_pcm_stream_unlock_irq(substream); 2594 return err; 2595 } 2596 2597 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2598 snd_pcm_sframes_t __user *res) 2599 { 2600 struct snd_pcm_runtime *runtime = substream->runtime; 2601 int err; 2602 snd_pcm_sframes_t n = 0; 2603 2604 snd_pcm_stream_lock_irq(substream); 2605 switch (runtime->status->state) { 2606 case SNDRV_PCM_STATE_DRAINING: 2607 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2608 goto __badfd; 2609 /* Fall through */ 2610 case SNDRV_PCM_STATE_RUNNING: 2611 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2612 break; 2613 /* Fall through */ 2614 case SNDRV_PCM_STATE_PREPARED: 2615 case SNDRV_PCM_STATE_SUSPENDED: 2616 err = 0; 2617 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2618 n = snd_pcm_playback_hw_avail(runtime); 2619 else 2620 n = snd_pcm_capture_avail(runtime); 2621 n += runtime->delay; 2622 break; 2623 case SNDRV_PCM_STATE_XRUN: 2624 err = -EPIPE; 2625 break; 2626 default: 2627 __badfd: 2628 err = -EBADFD; 2629 break; 2630 } 2631 snd_pcm_stream_unlock_irq(substream); 2632 if (!err) 2633 if (put_user(n, res)) 2634 err = -EFAULT; 2635 return err; 2636 } 2637 2638 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2639 struct snd_pcm_sync_ptr __user *_sync_ptr) 2640 { 2641 struct snd_pcm_runtime *runtime = substream->runtime; 2642 struct snd_pcm_sync_ptr sync_ptr; 2643 volatile struct snd_pcm_mmap_status *status; 2644 volatile struct snd_pcm_mmap_control *control; 2645 int err; 2646 2647 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2648 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2649 return -EFAULT; 2650 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2651 return -EFAULT; 2652 status = runtime->status; 2653 control = runtime->control; 2654 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2655 err = snd_pcm_hwsync(substream); 2656 if (err < 0) 2657 return err; 2658 } 2659 snd_pcm_stream_lock_irq(substream); 2660 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 2661 control->appl_ptr = sync_ptr.c.control.appl_ptr; 2662 else 2663 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2664 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2665 control->avail_min = sync_ptr.c.control.avail_min; 2666 else 2667 sync_ptr.c.control.avail_min = control->avail_min; 2668 sync_ptr.s.status.state = status->state; 2669 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2670 sync_ptr.s.status.tstamp = status->tstamp; 2671 sync_ptr.s.status.suspended_state = status->suspended_state; 2672 snd_pcm_stream_unlock_irq(substream); 2673 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2674 return -EFAULT; 2675 return 0; 2676 } 2677 2678 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2679 { 2680 struct snd_pcm_runtime *runtime = substream->runtime; 2681 int arg; 2682 2683 if (get_user(arg, _arg)) 2684 return -EFAULT; 2685 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2686 return -EINVAL; 2687 runtime->tstamp_type = arg; 2688 return 0; 2689 } 2690 2691 static int snd_pcm_common_ioctl1(struct file *file, 2692 struct snd_pcm_substream *substream, 2693 unsigned int cmd, void __user *arg) 2694 { 2695 switch (cmd) { 2696 case SNDRV_PCM_IOCTL_PVERSION: 2697 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2698 case SNDRV_PCM_IOCTL_INFO: 2699 return snd_pcm_info_user(substream, arg); 2700 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2701 return 0; 2702 case SNDRV_PCM_IOCTL_TTSTAMP: 2703 return snd_pcm_tstamp(substream, arg); 2704 case SNDRV_PCM_IOCTL_HW_REFINE: 2705 return snd_pcm_hw_refine_user(substream, arg); 2706 case SNDRV_PCM_IOCTL_HW_PARAMS: 2707 return snd_pcm_hw_params_user(substream, arg); 2708 case SNDRV_PCM_IOCTL_HW_FREE: 2709 return snd_pcm_hw_free(substream); 2710 case SNDRV_PCM_IOCTL_SW_PARAMS: 2711 return snd_pcm_sw_params_user(substream, arg); 2712 case SNDRV_PCM_IOCTL_STATUS: 2713 return snd_pcm_status_user(substream, arg); 2714 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2715 return snd_pcm_channel_info_user(substream, arg); 2716 case SNDRV_PCM_IOCTL_PREPARE: 2717 return snd_pcm_prepare(substream, file); 2718 case SNDRV_PCM_IOCTL_RESET: 2719 return snd_pcm_reset(substream); 2720 case SNDRV_PCM_IOCTL_START: 2721 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); 2722 case SNDRV_PCM_IOCTL_LINK: 2723 return snd_pcm_link(substream, (int)(unsigned long) arg); 2724 case SNDRV_PCM_IOCTL_UNLINK: 2725 return snd_pcm_unlink(substream); 2726 case SNDRV_PCM_IOCTL_RESUME: 2727 return snd_pcm_resume(substream); 2728 case SNDRV_PCM_IOCTL_XRUN: 2729 return snd_pcm_xrun(substream); 2730 case SNDRV_PCM_IOCTL_HWSYNC: 2731 return snd_pcm_hwsync(substream); 2732 case SNDRV_PCM_IOCTL_DELAY: 2733 return snd_pcm_delay(substream, arg); 2734 case SNDRV_PCM_IOCTL_SYNC_PTR: 2735 return snd_pcm_sync_ptr(substream, arg); 2736 #ifdef CONFIG_SND_SUPPORT_OLD_API 2737 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2738 return snd_pcm_hw_refine_old_user(substream, arg); 2739 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2740 return snd_pcm_hw_params_old_user(substream, arg); 2741 #endif 2742 case SNDRV_PCM_IOCTL_DRAIN: 2743 return snd_pcm_drain(substream, file); 2744 case SNDRV_PCM_IOCTL_DROP: 2745 return snd_pcm_drop(substream); 2746 case SNDRV_PCM_IOCTL_PAUSE: 2747 { 2748 int res; 2749 snd_pcm_stream_lock_irq(substream); 2750 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2751 snd_pcm_stream_unlock_irq(substream); 2752 return res; 2753 } 2754 } 2755 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2756 return -ENOTTY; 2757 } 2758 2759 static int snd_pcm_playback_ioctl1(struct file *file, 2760 struct snd_pcm_substream *substream, 2761 unsigned int cmd, void __user *arg) 2762 { 2763 if (snd_BUG_ON(!substream)) 2764 return -ENXIO; 2765 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2766 return -EINVAL; 2767 switch (cmd) { 2768 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2769 { 2770 struct snd_xferi xferi; 2771 struct snd_xferi __user *_xferi = arg; 2772 struct snd_pcm_runtime *runtime = substream->runtime; 2773 snd_pcm_sframes_t result; 2774 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2775 return -EBADFD; 2776 if (put_user(0, &_xferi->result)) 2777 return -EFAULT; 2778 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2779 return -EFAULT; 2780 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2781 __put_user(result, &_xferi->result); 2782 return result < 0 ? result : 0; 2783 } 2784 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2785 { 2786 struct snd_xfern xfern; 2787 struct snd_xfern __user *_xfern = arg; 2788 struct snd_pcm_runtime *runtime = substream->runtime; 2789 void __user **bufs; 2790 snd_pcm_sframes_t result; 2791 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2792 return -EBADFD; 2793 if (runtime->channels > 128) 2794 return -EINVAL; 2795 if (put_user(0, &_xfern->result)) 2796 return -EFAULT; 2797 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2798 return -EFAULT; 2799 2800 bufs = memdup_user(xfern.bufs, 2801 sizeof(void *) * runtime->channels); 2802 if (IS_ERR(bufs)) 2803 return PTR_ERR(bufs); 2804 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2805 kfree(bufs); 2806 __put_user(result, &_xfern->result); 2807 return result < 0 ? result : 0; 2808 } 2809 case SNDRV_PCM_IOCTL_REWIND: 2810 { 2811 snd_pcm_uframes_t frames; 2812 snd_pcm_uframes_t __user *_frames = arg; 2813 snd_pcm_sframes_t result; 2814 if (get_user(frames, _frames)) 2815 return -EFAULT; 2816 if (put_user(0, _frames)) 2817 return -EFAULT; 2818 result = snd_pcm_playback_rewind(substream, frames); 2819 __put_user(result, _frames); 2820 return result < 0 ? result : 0; 2821 } 2822 case SNDRV_PCM_IOCTL_FORWARD: 2823 { 2824 snd_pcm_uframes_t frames; 2825 snd_pcm_uframes_t __user *_frames = arg; 2826 snd_pcm_sframes_t result; 2827 if (get_user(frames, _frames)) 2828 return -EFAULT; 2829 if (put_user(0, _frames)) 2830 return -EFAULT; 2831 result = snd_pcm_playback_forward(substream, frames); 2832 __put_user(result, _frames); 2833 return result < 0 ? result : 0; 2834 } 2835 } 2836 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2837 } 2838 2839 static int snd_pcm_capture_ioctl1(struct file *file, 2840 struct snd_pcm_substream *substream, 2841 unsigned int cmd, void __user *arg) 2842 { 2843 if (snd_BUG_ON(!substream)) 2844 return -ENXIO; 2845 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2846 return -EINVAL; 2847 switch (cmd) { 2848 case SNDRV_PCM_IOCTL_READI_FRAMES: 2849 { 2850 struct snd_xferi xferi; 2851 struct snd_xferi __user *_xferi = arg; 2852 struct snd_pcm_runtime *runtime = substream->runtime; 2853 snd_pcm_sframes_t result; 2854 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2855 return -EBADFD; 2856 if (put_user(0, &_xferi->result)) 2857 return -EFAULT; 2858 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2859 return -EFAULT; 2860 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2861 __put_user(result, &_xferi->result); 2862 return result < 0 ? result : 0; 2863 } 2864 case SNDRV_PCM_IOCTL_READN_FRAMES: 2865 { 2866 struct snd_xfern xfern; 2867 struct snd_xfern __user *_xfern = arg; 2868 struct snd_pcm_runtime *runtime = substream->runtime; 2869 void *bufs; 2870 snd_pcm_sframes_t result; 2871 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2872 return -EBADFD; 2873 if (runtime->channels > 128) 2874 return -EINVAL; 2875 if (put_user(0, &_xfern->result)) 2876 return -EFAULT; 2877 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2878 return -EFAULT; 2879 2880 bufs = memdup_user(xfern.bufs, 2881 sizeof(void *) * runtime->channels); 2882 if (IS_ERR(bufs)) 2883 return PTR_ERR(bufs); 2884 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2885 kfree(bufs); 2886 __put_user(result, &_xfern->result); 2887 return result < 0 ? result : 0; 2888 } 2889 case SNDRV_PCM_IOCTL_REWIND: 2890 { 2891 snd_pcm_uframes_t frames; 2892 snd_pcm_uframes_t __user *_frames = arg; 2893 snd_pcm_sframes_t result; 2894 if (get_user(frames, _frames)) 2895 return -EFAULT; 2896 if (put_user(0, _frames)) 2897 return -EFAULT; 2898 result = snd_pcm_capture_rewind(substream, frames); 2899 __put_user(result, _frames); 2900 return result < 0 ? result : 0; 2901 } 2902 case SNDRV_PCM_IOCTL_FORWARD: 2903 { 2904 snd_pcm_uframes_t frames; 2905 snd_pcm_uframes_t __user *_frames = arg; 2906 snd_pcm_sframes_t result; 2907 if (get_user(frames, _frames)) 2908 return -EFAULT; 2909 if (put_user(0, _frames)) 2910 return -EFAULT; 2911 result = snd_pcm_capture_forward(substream, frames); 2912 __put_user(result, _frames); 2913 return result < 0 ? result : 0; 2914 } 2915 } 2916 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2917 } 2918 2919 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2920 unsigned long arg) 2921 { 2922 struct snd_pcm_file *pcm_file; 2923 2924 pcm_file = file->private_data; 2925 2926 if (((cmd >> 8) & 0xff) != 'A') 2927 return -ENOTTY; 2928 2929 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2930 (void __user *)arg); 2931 } 2932 2933 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2934 unsigned long arg) 2935 { 2936 struct snd_pcm_file *pcm_file; 2937 2938 pcm_file = file->private_data; 2939 2940 if (((cmd >> 8) & 0xff) != 'A') 2941 return -ENOTTY; 2942 2943 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2944 (void __user *)arg); 2945 } 2946 2947 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2948 unsigned int cmd, void *arg) 2949 { 2950 mm_segment_t fs; 2951 int result; 2952 2953 fs = snd_enter_user(); 2954 switch (substream->stream) { 2955 case SNDRV_PCM_STREAM_PLAYBACK: 2956 result = snd_pcm_playback_ioctl1(NULL, substream, cmd, 2957 (void __user *)arg); 2958 break; 2959 case SNDRV_PCM_STREAM_CAPTURE: 2960 result = snd_pcm_capture_ioctl1(NULL, substream, cmd, 2961 (void __user *)arg); 2962 break; 2963 default: 2964 result = -EINVAL; 2965 break; 2966 } 2967 snd_leave_user(fs); 2968 return result; 2969 } 2970 2971 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2972 2973 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2974 loff_t * offset) 2975 { 2976 struct snd_pcm_file *pcm_file; 2977 struct snd_pcm_substream *substream; 2978 struct snd_pcm_runtime *runtime; 2979 snd_pcm_sframes_t result; 2980 2981 pcm_file = file->private_data; 2982 substream = pcm_file->substream; 2983 if (PCM_RUNTIME_CHECK(substream)) 2984 return -ENXIO; 2985 runtime = substream->runtime; 2986 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2987 return -EBADFD; 2988 if (!frame_aligned(runtime, count)) 2989 return -EINVAL; 2990 count = bytes_to_frames(runtime, count); 2991 result = snd_pcm_lib_read(substream, buf, count); 2992 if (result > 0) 2993 result = frames_to_bytes(runtime, result); 2994 return result; 2995 } 2996 2997 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 2998 size_t count, loff_t * offset) 2999 { 3000 struct snd_pcm_file *pcm_file; 3001 struct snd_pcm_substream *substream; 3002 struct snd_pcm_runtime *runtime; 3003 snd_pcm_sframes_t result; 3004 3005 pcm_file = file->private_data; 3006 substream = pcm_file->substream; 3007 if (PCM_RUNTIME_CHECK(substream)) 3008 return -ENXIO; 3009 runtime = substream->runtime; 3010 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3011 return -EBADFD; 3012 if (!frame_aligned(runtime, count)) 3013 return -EINVAL; 3014 count = bytes_to_frames(runtime, count); 3015 result = snd_pcm_lib_write(substream, buf, count); 3016 if (result > 0) 3017 result = frames_to_bytes(runtime, result); 3018 return result; 3019 } 3020 3021 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov, 3022 unsigned long nr_segs, loff_t pos) 3023 3024 { 3025 struct snd_pcm_file *pcm_file; 3026 struct snd_pcm_substream *substream; 3027 struct snd_pcm_runtime *runtime; 3028 snd_pcm_sframes_t result; 3029 unsigned long i; 3030 void __user **bufs; 3031 snd_pcm_uframes_t frames; 3032 3033 pcm_file = iocb->ki_filp->private_data; 3034 substream = pcm_file->substream; 3035 if (PCM_RUNTIME_CHECK(substream)) 3036 return -ENXIO; 3037 runtime = substream->runtime; 3038 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3039 return -EBADFD; 3040 if (nr_segs > 1024 || nr_segs != runtime->channels) 3041 return -EINVAL; 3042 if (!frame_aligned(runtime, iov->iov_len)) 3043 return -EINVAL; 3044 frames = bytes_to_samples(runtime, iov->iov_len); 3045 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 3046 if (bufs == NULL) 3047 return -ENOMEM; 3048 for (i = 0; i < nr_segs; ++i) 3049 bufs[i] = iov[i].iov_base; 3050 result = snd_pcm_lib_readv(substream, bufs, frames); 3051 if (result > 0) 3052 result = frames_to_bytes(runtime, result); 3053 kfree(bufs); 3054 return result; 3055 } 3056 3057 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov, 3058 unsigned long nr_segs, loff_t pos) 3059 { 3060 struct snd_pcm_file *pcm_file; 3061 struct snd_pcm_substream *substream; 3062 struct snd_pcm_runtime *runtime; 3063 snd_pcm_sframes_t result; 3064 unsigned long i; 3065 void __user **bufs; 3066 snd_pcm_uframes_t frames; 3067 3068 pcm_file = iocb->ki_filp->private_data; 3069 substream = pcm_file->substream; 3070 if (PCM_RUNTIME_CHECK(substream)) 3071 return -ENXIO; 3072 runtime = substream->runtime; 3073 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3074 return -EBADFD; 3075 if (nr_segs > 128 || nr_segs != runtime->channels || 3076 !frame_aligned(runtime, iov->iov_len)) 3077 return -EINVAL; 3078 frames = bytes_to_samples(runtime, iov->iov_len); 3079 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 3080 if (bufs == NULL) 3081 return -ENOMEM; 3082 for (i = 0; i < nr_segs; ++i) 3083 bufs[i] = iov[i].iov_base; 3084 result = snd_pcm_lib_writev(substream, bufs, frames); 3085 if (result > 0) 3086 result = frames_to_bytes(runtime, result); 3087 kfree(bufs); 3088 return result; 3089 } 3090 3091 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3092 { 3093 struct snd_pcm_file *pcm_file; 3094 struct snd_pcm_substream *substream; 3095 struct snd_pcm_runtime *runtime; 3096 unsigned int mask; 3097 snd_pcm_uframes_t avail; 3098 3099 pcm_file = file->private_data; 3100 3101 substream = pcm_file->substream; 3102 if (PCM_RUNTIME_CHECK(substream)) 3103 return -ENXIO; 3104 runtime = substream->runtime; 3105 3106 poll_wait(file, &runtime->sleep, wait); 3107 3108 snd_pcm_stream_lock_irq(substream); 3109 avail = snd_pcm_playback_avail(runtime); 3110 switch (runtime->status->state) { 3111 case SNDRV_PCM_STATE_RUNNING: 3112 case SNDRV_PCM_STATE_PREPARED: 3113 case SNDRV_PCM_STATE_PAUSED: 3114 if (avail >= runtime->control->avail_min) { 3115 mask = POLLOUT | POLLWRNORM; 3116 break; 3117 } 3118 /* Fall through */ 3119 case SNDRV_PCM_STATE_DRAINING: 3120 mask = 0; 3121 break; 3122 default: 3123 mask = POLLOUT | POLLWRNORM | POLLERR; 3124 break; 3125 } 3126 snd_pcm_stream_unlock_irq(substream); 3127 return mask; 3128 } 3129 3130 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3131 { 3132 struct snd_pcm_file *pcm_file; 3133 struct snd_pcm_substream *substream; 3134 struct snd_pcm_runtime *runtime; 3135 unsigned int mask; 3136 snd_pcm_uframes_t avail; 3137 3138 pcm_file = file->private_data; 3139 3140 substream = pcm_file->substream; 3141 if (PCM_RUNTIME_CHECK(substream)) 3142 return -ENXIO; 3143 runtime = substream->runtime; 3144 3145 poll_wait(file, &runtime->sleep, wait); 3146 3147 snd_pcm_stream_lock_irq(substream); 3148 avail = snd_pcm_capture_avail(runtime); 3149 switch (runtime->status->state) { 3150 case SNDRV_PCM_STATE_RUNNING: 3151 case SNDRV_PCM_STATE_PREPARED: 3152 case SNDRV_PCM_STATE_PAUSED: 3153 if (avail >= runtime->control->avail_min) { 3154 mask = POLLIN | POLLRDNORM; 3155 break; 3156 } 3157 mask = 0; 3158 break; 3159 case SNDRV_PCM_STATE_DRAINING: 3160 if (avail > 0) { 3161 mask = POLLIN | POLLRDNORM; 3162 break; 3163 } 3164 /* Fall through */ 3165 default: 3166 mask = POLLIN | POLLRDNORM | POLLERR; 3167 break; 3168 } 3169 snd_pcm_stream_unlock_irq(substream); 3170 return mask; 3171 } 3172 3173 /* 3174 * mmap support 3175 */ 3176 3177 /* 3178 * Only on coherent architectures, we can mmap the status and the control records 3179 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3180 */ 3181 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3182 /* 3183 * mmap status record 3184 */ 3185 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area, 3186 struct vm_fault *vmf) 3187 { 3188 struct snd_pcm_substream *substream = area->vm_private_data; 3189 struct snd_pcm_runtime *runtime; 3190 3191 if (substream == NULL) 3192 return VM_FAULT_SIGBUS; 3193 runtime = substream->runtime; 3194 vmf->page = virt_to_page(runtime->status); 3195 get_page(vmf->page); 3196 return 0; 3197 } 3198 3199 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3200 { 3201 .fault = snd_pcm_mmap_status_fault, 3202 }; 3203 3204 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3205 struct vm_area_struct *area) 3206 { 3207 long size; 3208 if (!(area->vm_flags & VM_READ)) 3209 return -EINVAL; 3210 size = area->vm_end - area->vm_start; 3211 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3212 return -EINVAL; 3213 area->vm_ops = &snd_pcm_vm_ops_status; 3214 area->vm_private_data = substream; 3215 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3216 return 0; 3217 } 3218 3219 /* 3220 * mmap control record 3221 */ 3222 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area, 3223 struct vm_fault *vmf) 3224 { 3225 struct snd_pcm_substream *substream = area->vm_private_data; 3226 struct snd_pcm_runtime *runtime; 3227 3228 if (substream == NULL) 3229 return VM_FAULT_SIGBUS; 3230 runtime = substream->runtime; 3231 vmf->page = virt_to_page(runtime->control); 3232 get_page(vmf->page); 3233 return 0; 3234 } 3235 3236 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3237 { 3238 .fault = snd_pcm_mmap_control_fault, 3239 }; 3240 3241 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3242 struct vm_area_struct *area) 3243 { 3244 long size; 3245 if (!(area->vm_flags & VM_READ)) 3246 return -EINVAL; 3247 size = area->vm_end - area->vm_start; 3248 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3249 return -EINVAL; 3250 area->vm_ops = &snd_pcm_vm_ops_control; 3251 area->vm_private_data = substream; 3252 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3253 return 0; 3254 } 3255 #else /* ! coherent mmap */ 3256 /* 3257 * don't support mmap for status and control records. 3258 */ 3259 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3260 struct vm_area_struct *area) 3261 { 3262 return -ENXIO; 3263 } 3264 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3265 struct vm_area_struct *area) 3266 { 3267 return -ENXIO; 3268 } 3269 #endif /* coherent mmap */ 3270 3271 static inline struct page * 3272 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3273 { 3274 void *vaddr = substream->runtime->dma_area + ofs; 3275 return virt_to_page(vaddr); 3276 } 3277 3278 /* 3279 * fault callback for mmapping a RAM page 3280 */ 3281 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area, 3282 struct vm_fault *vmf) 3283 { 3284 struct snd_pcm_substream *substream = area->vm_private_data; 3285 struct snd_pcm_runtime *runtime; 3286 unsigned long offset; 3287 struct page * page; 3288 size_t dma_bytes; 3289 3290 if (substream == NULL) 3291 return VM_FAULT_SIGBUS; 3292 runtime = substream->runtime; 3293 offset = vmf->pgoff << PAGE_SHIFT; 3294 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3295 if (offset > dma_bytes - PAGE_SIZE) 3296 return VM_FAULT_SIGBUS; 3297 if (substream->ops->page) 3298 page = substream->ops->page(substream, offset); 3299 else 3300 page = snd_pcm_default_page_ops(substream, offset); 3301 if (!page) 3302 return VM_FAULT_SIGBUS; 3303 get_page(page); 3304 vmf->page = page; 3305 return 0; 3306 } 3307 3308 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3309 .open = snd_pcm_mmap_data_open, 3310 .close = snd_pcm_mmap_data_close, 3311 }; 3312 3313 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3314 .open = snd_pcm_mmap_data_open, 3315 .close = snd_pcm_mmap_data_close, 3316 .fault = snd_pcm_mmap_data_fault, 3317 }; 3318 3319 /* 3320 * mmap the DMA buffer on RAM 3321 */ 3322 3323 /** 3324 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3325 * @substream: PCM substream 3326 * @area: VMA 3327 * 3328 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3329 * this function is invoked implicitly. 3330 */ 3331 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3332 struct vm_area_struct *area) 3333 { 3334 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3335 #ifdef CONFIG_GENERIC_ALLOCATOR 3336 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3337 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3338 return remap_pfn_range(area, area->vm_start, 3339 substream->dma_buffer.addr >> PAGE_SHIFT, 3340 area->vm_end - area->vm_start, area->vm_page_prot); 3341 } 3342 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3343 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3344 if (!substream->ops->page && 3345 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3346 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3347 area, 3348 substream->runtime->dma_area, 3349 substream->runtime->dma_addr, 3350 area->vm_end - area->vm_start); 3351 #endif /* CONFIG_X86 */ 3352 /* mmap with fault handler */ 3353 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3354 return 0; 3355 } 3356 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3357 3358 /* 3359 * mmap the DMA buffer on I/O memory area 3360 */ 3361 #if SNDRV_PCM_INFO_MMAP_IOMEM 3362 /** 3363 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3364 * @substream: PCM substream 3365 * @area: VMA 3366 * 3367 * When your hardware uses the iomapped pages as the hardware buffer and 3368 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3369 * is supposed to work only on limited architectures. 3370 */ 3371 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3372 struct vm_area_struct *area) 3373 { 3374 struct snd_pcm_runtime *runtime = substream->runtime;; 3375 3376 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3377 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3378 } 3379 3380 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3381 #endif /* SNDRV_PCM_INFO_MMAP */ 3382 3383 /* 3384 * mmap DMA buffer 3385 */ 3386 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3387 struct vm_area_struct *area) 3388 { 3389 struct snd_pcm_runtime *runtime; 3390 long size; 3391 unsigned long offset; 3392 size_t dma_bytes; 3393 int err; 3394 3395 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3396 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3397 return -EINVAL; 3398 } else { 3399 if (!(area->vm_flags & VM_READ)) 3400 return -EINVAL; 3401 } 3402 runtime = substream->runtime; 3403 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3404 return -EBADFD; 3405 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3406 return -ENXIO; 3407 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3408 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3409 return -EINVAL; 3410 size = area->vm_end - area->vm_start; 3411 offset = area->vm_pgoff << PAGE_SHIFT; 3412 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3413 if ((size_t)size > dma_bytes) 3414 return -EINVAL; 3415 if (offset > dma_bytes - size) 3416 return -EINVAL; 3417 3418 area->vm_ops = &snd_pcm_vm_ops_data; 3419 area->vm_private_data = substream; 3420 if (substream->ops->mmap) 3421 err = substream->ops->mmap(substream, area); 3422 else 3423 err = snd_pcm_lib_default_mmap(substream, area); 3424 if (!err) 3425 atomic_inc(&substream->mmap_count); 3426 return err; 3427 } 3428 3429 EXPORT_SYMBOL(snd_pcm_mmap_data); 3430 3431 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3432 { 3433 struct snd_pcm_file * pcm_file; 3434 struct snd_pcm_substream *substream; 3435 unsigned long offset; 3436 3437 pcm_file = file->private_data; 3438 substream = pcm_file->substream; 3439 if (PCM_RUNTIME_CHECK(substream)) 3440 return -ENXIO; 3441 3442 offset = area->vm_pgoff << PAGE_SHIFT; 3443 switch (offset) { 3444 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3445 if (pcm_file->no_compat_mmap) 3446 return -ENXIO; 3447 return snd_pcm_mmap_status(substream, file, area); 3448 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3449 if (pcm_file->no_compat_mmap) 3450 return -ENXIO; 3451 return snd_pcm_mmap_control(substream, file, area); 3452 default: 3453 return snd_pcm_mmap_data(substream, file, area); 3454 } 3455 return 0; 3456 } 3457 3458 static int snd_pcm_fasync(int fd, struct file * file, int on) 3459 { 3460 struct snd_pcm_file * pcm_file; 3461 struct snd_pcm_substream *substream; 3462 struct snd_pcm_runtime *runtime; 3463 3464 pcm_file = file->private_data; 3465 substream = pcm_file->substream; 3466 if (PCM_RUNTIME_CHECK(substream)) 3467 return -ENXIO; 3468 runtime = substream->runtime; 3469 return fasync_helper(fd, file, on, &runtime->fasync); 3470 } 3471 3472 /* 3473 * ioctl32 compat 3474 */ 3475 #ifdef CONFIG_COMPAT 3476 #include "pcm_compat.c" 3477 #else 3478 #define snd_pcm_ioctl_compat NULL 3479 #endif 3480 3481 /* 3482 * To be removed helpers to keep binary compatibility 3483 */ 3484 3485 #ifdef CONFIG_SND_SUPPORT_OLD_API 3486 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3487 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3488 3489 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3490 struct snd_pcm_hw_params_old *oparams) 3491 { 3492 unsigned int i; 3493 3494 memset(params, 0, sizeof(*params)); 3495 params->flags = oparams->flags; 3496 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3497 params->masks[i].bits[0] = oparams->masks[i]; 3498 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3499 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3500 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3501 params->info = oparams->info; 3502 params->msbits = oparams->msbits; 3503 params->rate_num = oparams->rate_num; 3504 params->rate_den = oparams->rate_den; 3505 params->fifo_size = oparams->fifo_size; 3506 } 3507 3508 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3509 struct snd_pcm_hw_params *params) 3510 { 3511 unsigned int i; 3512 3513 memset(oparams, 0, sizeof(*oparams)); 3514 oparams->flags = params->flags; 3515 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3516 oparams->masks[i] = params->masks[i].bits[0]; 3517 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3518 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3519 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3520 oparams->info = params->info; 3521 oparams->msbits = params->msbits; 3522 oparams->rate_num = params->rate_num; 3523 oparams->rate_den = params->rate_den; 3524 oparams->fifo_size = params->fifo_size; 3525 } 3526 3527 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3528 struct snd_pcm_hw_params_old __user * _oparams) 3529 { 3530 struct snd_pcm_hw_params *params; 3531 struct snd_pcm_hw_params_old *oparams = NULL; 3532 int err; 3533 3534 params = kmalloc(sizeof(*params), GFP_KERNEL); 3535 if (!params) 3536 return -ENOMEM; 3537 3538 oparams = memdup_user(_oparams, sizeof(*oparams)); 3539 if (IS_ERR(oparams)) { 3540 err = PTR_ERR(oparams); 3541 goto out; 3542 } 3543 snd_pcm_hw_convert_from_old_params(params, oparams); 3544 err = snd_pcm_hw_refine(substream, params); 3545 snd_pcm_hw_convert_to_old_params(oparams, params); 3546 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3547 if (!err) 3548 err = -EFAULT; 3549 } 3550 3551 kfree(oparams); 3552 out: 3553 kfree(params); 3554 return err; 3555 } 3556 3557 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3558 struct snd_pcm_hw_params_old __user * _oparams) 3559 { 3560 struct snd_pcm_hw_params *params; 3561 struct snd_pcm_hw_params_old *oparams = NULL; 3562 int err; 3563 3564 params = kmalloc(sizeof(*params), GFP_KERNEL); 3565 if (!params) 3566 return -ENOMEM; 3567 3568 oparams = memdup_user(_oparams, sizeof(*oparams)); 3569 if (IS_ERR(oparams)) { 3570 err = PTR_ERR(oparams); 3571 goto out; 3572 } 3573 snd_pcm_hw_convert_from_old_params(params, oparams); 3574 err = snd_pcm_hw_params(substream, params); 3575 snd_pcm_hw_convert_to_old_params(oparams, params); 3576 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3577 if (!err) 3578 err = -EFAULT; 3579 } 3580 3581 kfree(oparams); 3582 out: 3583 kfree(params); 3584 return err; 3585 } 3586 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3587 3588 #ifndef CONFIG_MMU 3589 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3590 unsigned long addr, 3591 unsigned long len, 3592 unsigned long pgoff, 3593 unsigned long flags) 3594 { 3595 struct snd_pcm_file *pcm_file = file->private_data; 3596 struct snd_pcm_substream *substream = pcm_file->substream; 3597 struct snd_pcm_runtime *runtime = substream->runtime; 3598 unsigned long offset = pgoff << PAGE_SHIFT; 3599 3600 switch (offset) { 3601 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3602 return (unsigned long)runtime->status; 3603 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3604 return (unsigned long)runtime->control; 3605 default: 3606 return (unsigned long)runtime->dma_area + offset; 3607 } 3608 } 3609 #else 3610 # define snd_pcm_get_unmapped_area NULL 3611 #endif 3612 3613 /* 3614 * Register section 3615 */ 3616 3617 const struct file_operations snd_pcm_f_ops[2] = { 3618 { 3619 .owner = THIS_MODULE, 3620 .write = snd_pcm_write, 3621 .aio_write = snd_pcm_aio_write, 3622 .open = snd_pcm_playback_open, 3623 .release = snd_pcm_release, 3624 .llseek = no_llseek, 3625 .poll = snd_pcm_playback_poll, 3626 .unlocked_ioctl = snd_pcm_playback_ioctl, 3627 .compat_ioctl = snd_pcm_ioctl_compat, 3628 .mmap = snd_pcm_mmap, 3629 .fasync = snd_pcm_fasync, 3630 .get_unmapped_area = snd_pcm_get_unmapped_area, 3631 }, 3632 { 3633 .owner = THIS_MODULE, 3634 .read = snd_pcm_read, 3635 .aio_read = snd_pcm_aio_read, 3636 .open = snd_pcm_capture_open, 3637 .release = snd_pcm_release, 3638 .llseek = no_llseek, 3639 .poll = snd_pcm_capture_poll, 3640 .unlocked_ioctl = snd_pcm_capture_ioctl, 3641 .compat_ioctl = snd_pcm_ioctl_compat, 3642 .mmap = snd_pcm_mmap, 3643 .fasync = snd_pcm_fasync, 3644 .get_unmapped_area = snd_pcm_get_unmapped_area, 3645 } 3646 }; 3647