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