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