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/io.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 <linux/uio.h> 38 39 /* 40 * Compatibility 41 */ 42 43 struct snd_pcm_hw_params_old { 44 unsigned int flags; 45 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 46 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 47 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 48 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 49 unsigned int rmask; 50 unsigned int cmask; 51 unsigned int info; 52 unsigned int msbits; 53 unsigned int rate_num; 54 unsigned int rate_den; 55 snd_pcm_uframes_t fifo_size; 56 unsigned char reserved[64]; 57 }; 58 59 #ifdef CONFIG_SND_SUPPORT_OLD_API 60 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 61 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 62 63 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 64 struct snd_pcm_hw_params_old __user * _oparams); 65 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 66 struct snd_pcm_hw_params_old __user * _oparams); 67 #endif 68 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 69 70 /* 71 * 72 */ 73 74 static DEFINE_RWLOCK(snd_pcm_link_rwlock); 75 static DECLARE_RWSEM(snd_pcm_link_rwsem); 76 77 /** 78 * snd_pcm_stream_lock - Lock the PCM stream 79 * @substream: PCM substream 80 * 81 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 82 * flag of the given substream. This also takes the global link rw lock 83 * (or rw sem), too, for avoiding the race with linked streams. 84 */ 85 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 86 { 87 if (substream->pcm->nonatomic) { 88 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING); 89 mutex_lock(&substream->self_group.mutex); 90 } else { 91 read_lock(&snd_pcm_link_rwlock); 92 spin_lock(&substream->self_group.lock); 93 } 94 } 95 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 96 97 /** 98 * snd_pcm_stream_lock - Unlock the PCM stream 99 * @substream: PCM substream 100 * 101 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 102 */ 103 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 104 { 105 if (substream->pcm->nonatomic) { 106 mutex_unlock(&substream->self_group.mutex); 107 up_read(&snd_pcm_link_rwsem); 108 } else { 109 spin_unlock(&substream->self_group.lock); 110 read_unlock(&snd_pcm_link_rwlock); 111 } 112 } 113 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 114 115 /** 116 * snd_pcm_stream_lock_irq - Lock the PCM stream 117 * @substream: PCM substream 118 * 119 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 120 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 121 * as snd_pcm_stream_lock(). 122 */ 123 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 124 { 125 if (!substream->pcm->nonatomic) 126 local_irq_disable(); 127 snd_pcm_stream_lock(substream); 128 } 129 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 130 131 /** 132 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 133 * @substream: PCM substream 134 * 135 * This is a counter-part of snd_pcm_stream_lock_irq(). 136 */ 137 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 138 { 139 snd_pcm_stream_unlock(substream); 140 if (!substream->pcm->nonatomic) 141 local_irq_enable(); 142 } 143 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 144 145 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 146 { 147 unsigned long flags = 0; 148 if (!substream->pcm->nonatomic) 149 local_irq_save(flags); 150 snd_pcm_stream_lock(substream); 151 return flags; 152 } 153 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 154 155 /** 156 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 157 * @substream: PCM substream 158 * @flags: irq flags 159 * 160 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 161 */ 162 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 163 unsigned long flags) 164 { 165 snd_pcm_stream_unlock(substream); 166 if (!substream->pcm->nonatomic) 167 local_irq_restore(flags); 168 } 169 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 170 171 static inline mm_segment_t snd_enter_user(void) 172 { 173 mm_segment_t fs = get_fs(); 174 set_fs(get_ds()); 175 return fs; 176 } 177 178 static inline void snd_leave_user(mm_segment_t fs) 179 { 180 set_fs(fs); 181 } 182 183 184 185 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 186 { 187 struct snd_pcm_runtime *runtime; 188 struct snd_pcm *pcm = substream->pcm; 189 struct snd_pcm_str *pstr = substream->pstr; 190 191 memset(info, 0, sizeof(*info)); 192 info->card = pcm->card->number; 193 info->device = pcm->device; 194 info->stream = substream->stream; 195 info->subdevice = substream->number; 196 strlcpy(info->id, pcm->id, sizeof(info->id)); 197 strlcpy(info->name, pcm->name, sizeof(info->name)); 198 info->dev_class = pcm->dev_class; 199 info->dev_subclass = pcm->dev_subclass; 200 info->subdevices_count = pstr->substream_count; 201 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 202 strlcpy(info->subname, substream->name, sizeof(info->subname)); 203 runtime = substream->runtime; 204 /* AB: FIXME!!! This is definitely nonsense */ 205 if (runtime) { 206 info->sync = runtime->sync; 207 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info); 208 } 209 return 0; 210 } 211 212 int snd_pcm_info_user(struct snd_pcm_substream *substream, 213 struct snd_pcm_info __user * _info) 214 { 215 struct snd_pcm_info *info; 216 int err; 217 218 info = kmalloc(sizeof(*info), GFP_KERNEL); 219 if (! info) 220 return -ENOMEM; 221 err = snd_pcm_info(substream, info); 222 if (err >= 0) { 223 if (copy_to_user(_info, info, sizeof(*info))) 224 err = -EFAULT; 225 } 226 kfree(info); 227 return err; 228 } 229 230 static bool hw_support_mmap(struct snd_pcm_substream *substream) 231 { 232 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 233 return false; 234 /* check architectures that return -EINVAL from dma_mmap_coherent() */ 235 /* FIXME: this should be some global flag */ 236 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\ 237 defined(CONFIG_PARISC) || defined(CONFIG_XTENSA) 238 if (!substream->ops->mmap && 239 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 240 return false; 241 #endif 242 return true; 243 } 244 245 #undef RULES_DEBUG 246 247 #ifdef RULES_DEBUG 248 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v 249 static const char * const snd_pcm_hw_param_names[] = { 250 HW_PARAM(ACCESS), 251 HW_PARAM(FORMAT), 252 HW_PARAM(SUBFORMAT), 253 HW_PARAM(SAMPLE_BITS), 254 HW_PARAM(FRAME_BITS), 255 HW_PARAM(CHANNELS), 256 HW_PARAM(RATE), 257 HW_PARAM(PERIOD_TIME), 258 HW_PARAM(PERIOD_SIZE), 259 HW_PARAM(PERIOD_BYTES), 260 HW_PARAM(PERIODS), 261 HW_PARAM(BUFFER_TIME), 262 HW_PARAM(BUFFER_SIZE), 263 HW_PARAM(BUFFER_BYTES), 264 HW_PARAM(TICK_TIME), 265 }; 266 #endif 267 268 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 269 struct snd_pcm_hw_params *params) 270 { 271 unsigned int k; 272 struct snd_pcm_hardware *hw; 273 struct snd_interval *i = NULL; 274 struct snd_mask *m = NULL; 275 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints; 276 unsigned int rstamps[constrs->rules_num]; 277 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 278 unsigned int stamp = 2; 279 int changed, again; 280 281 params->info = 0; 282 params->fifo_size = 0; 283 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 284 params->msbits = 0; 285 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 286 params->rate_num = 0; 287 params->rate_den = 0; 288 } 289 290 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 291 m = hw_param_mask(params, k); 292 if (snd_mask_empty(m)) 293 return -EINVAL; 294 if (!(params->rmask & (1 << k))) 295 continue; 296 #ifdef RULES_DEBUG 297 pr_debug("%s = ", snd_pcm_hw_param_names[k]); 298 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 299 #endif 300 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 301 #ifdef RULES_DEBUG 302 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 303 #endif 304 if (changed) 305 params->cmask |= 1 << k; 306 if (changed < 0) 307 return changed; 308 } 309 310 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 311 i = hw_param_interval(params, k); 312 if (snd_interval_empty(i)) 313 return -EINVAL; 314 if (!(params->rmask & (1 << k))) 315 continue; 316 #ifdef RULES_DEBUG 317 pr_debug("%s = ", snd_pcm_hw_param_names[k]); 318 if (i->empty) 319 pr_cont("empty"); 320 else 321 pr_cont("%c%u %u%c", 322 i->openmin ? '(' : '[', i->min, 323 i->max, i->openmax ? ')' : ']'); 324 pr_cont(" -> "); 325 #endif 326 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 327 #ifdef RULES_DEBUG 328 if (i->empty) 329 pr_cont("empty\n"); 330 else 331 pr_cont("%c%u %u%c\n", 332 i->openmin ? '(' : '[', i->min, 333 i->max, i->openmax ? ')' : ']'); 334 #endif 335 if (changed) 336 params->cmask |= 1 << k; 337 if (changed < 0) 338 return changed; 339 } 340 341 for (k = 0; k < constrs->rules_num; k++) 342 rstamps[k] = 0; 343 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 344 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 345 do { 346 again = 0; 347 for (k = 0; k < constrs->rules_num; k++) { 348 struct snd_pcm_hw_rule *r = &constrs->rules[k]; 349 unsigned int d; 350 int doit = 0; 351 if (r->cond && !(r->cond & params->flags)) 352 continue; 353 for (d = 0; r->deps[d] >= 0; d++) { 354 if (vstamps[r->deps[d]] > rstamps[k]) { 355 doit = 1; 356 break; 357 } 358 } 359 if (!doit) 360 continue; 361 #ifdef RULES_DEBUG 362 pr_debug("Rule %d [%p]: ", k, r->func); 363 if (r->var >= 0) { 364 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]); 365 if (hw_is_mask(r->var)) { 366 m = hw_param_mask(params, r->var); 367 pr_cont("%x", *m->bits); 368 } else { 369 i = hw_param_interval(params, r->var); 370 if (i->empty) 371 pr_cont("empty"); 372 else 373 pr_cont("%c%u %u%c", 374 i->openmin ? '(' : '[', i->min, 375 i->max, i->openmax ? ')' : ']'); 376 } 377 } 378 #endif 379 changed = r->func(params, r); 380 #ifdef RULES_DEBUG 381 if (r->var >= 0) { 382 pr_cont(" -> "); 383 if (hw_is_mask(r->var)) 384 pr_cont("%x", *m->bits); 385 else { 386 if (i->empty) 387 pr_cont("empty"); 388 else 389 pr_cont("%c%u %u%c", 390 i->openmin ? '(' : '[', i->min, 391 i->max, i->openmax ? ')' : ']'); 392 } 393 } 394 pr_cont("\n"); 395 #endif 396 rstamps[k] = stamp; 397 if (changed && r->var >= 0) { 398 params->cmask |= (1 << r->var); 399 vstamps[r->var] = stamp; 400 again = 1; 401 } 402 if (changed < 0) 403 return changed; 404 stamp++; 405 } 406 } while (again); 407 if (!params->msbits) { 408 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 409 if (snd_interval_single(i)) 410 params->msbits = snd_interval_value(i); 411 } 412 413 if (!params->rate_den) { 414 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 415 if (snd_interval_single(i)) { 416 params->rate_num = snd_interval_value(i); 417 params->rate_den = 1; 418 } 419 } 420 421 hw = &substream->runtime->hw; 422 if (!params->info) { 423 params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 424 SNDRV_PCM_INFO_DRAIN_TRIGGER); 425 if (!hw_support_mmap(substream)) 426 params->info &= ~(SNDRV_PCM_INFO_MMAP | 427 SNDRV_PCM_INFO_MMAP_VALID); 428 } 429 if (!params->fifo_size) { 430 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 431 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 432 if (snd_mask_min(m) == snd_mask_max(m) && 433 snd_interval_min(i) == snd_interval_max(i)) { 434 changed = substream->ops->ioctl(substream, 435 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 436 if (changed < 0) 437 return changed; 438 } 439 } 440 params->rmask = 0; 441 return 0; 442 } 443 444 EXPORT_SYMBOL(snd_pcm_hw_refine); 445 446 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 447 struct snd_pcm_hw_params __user * _params) 448 { 449 struct snd_pcm_hw_params *params; 450 int err; 451 452 params = memdup_user(_params, sizeof(*params)); 453 if (IS_ERR(params)) 454 return PTR_ERR(params); 455 456 err = snd_pcm_hw_refine(substream, params); 457 if (copy_to_user(_params, params, sizeof(*params))) { 458 if (!err) 459 err = -EFAULT; 460 } 461 462 kfree(params); 463 return err; 464 } 465 466 static int period_to_usecs(struct snd_pcm_runtime *runtime) 467 { 468 int usecs; 469 470 if (! runtime->rate) 471 return -1; /* invalid */ 472 473 /* take 75% of period time as the deadline */ 474 usecs = (750000 / runtime->rate) * runtime->period_size; 475 usecs += ((750000 % runtime->rate) * runtime->period_size) / 476 runtime->rate; 477 478 return usecs; 479 } 480 481 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 482 { 483 snd_pcm_stream_lock_irq(substream); 484 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 485 substream->runtime->status->state = state; 486 snd_pcm_stream_unlock_irq(substream); 487 } 488 489 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 490 int event) 491 { 492 #ifdef CONFIG_SND_PCM_TIMER 493 if (substream->timer) 494 snd_timer_notify(substream->timer, event, 495 &substream->runtime->trigger_tstamp); 496 #endif 497 } 498 499 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 500 struct snd_pcm_hw_params *params) 501 { 502 struct snd_pcm_runtime *runtime; 503 int err, usecs; 504 unsigned int bits; 505 snd_pcm_uframes_t frames; 506 507 if (PCM_RUNTIME_CHECK(substream)) 508 return -ENXIO; 509 runtime = substream->runtime; 510 snd_pcm_stream_lock_irq(substream); 511 switch (runtime->status->state) { 512 case SNDRV_PCM_STATE_OPEN: 513 case SNDRV_PCM_STATE_SETUP: 514 case SNDRV_PCM_STATE_PREPARED: 515 break; 516 default: 517 snd_pcm_stream_unlock_irq(substream); 518 return -EBADFD; 519 } 520 snd_pcm_stream_unlock_irq(substream); 521 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 522 if (!substream->oss.oss) 523 #endif 524 if (atomic_read(&substream->mmap_count)) 525 return -EBADFD; 526 527 params->rmask = ~0U; 528 err = snd_pcm_hw_refine(substream, params); 529 if (err < 0) 530 goto _error; 531 532 err = snd_pcm_hw_params_choose(substream, params); 533 if (err < 0) 534 goto _error; 535 536 if (substream->ops->hw_params != NULL) { 537 err = substream->ops->hw_params(substream, params); 538 if (err < 0) 539 goto _error; 540 } 541 542 runtime->access = params_access(params); 543 runtime->format = params_format(params); 544 runtime->subformat = params_subformat(params); 545 runtime->channels = params_channels(params); 546 runtime->rate = params_rate(params); 547 runtime->period_size = params_period_size(params); 548 runtime->periods = params_periods(params); 549 runtime->buffer_size = params_buffer_size(params); 550 runtime->info = params->info; 551 runtime->rate_num = params->rate_num; 552 runtime->rate_den = params->rate_den; 553 runtime->no_period_wakeup = 554 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 555 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 556 557 bits = snd_pcm_format_physical_width(runtime->format); 558 runtime->sample_bits = bits; 559 bits *= runtime->channels; 560 runtime->frame_bits = bits; 561 frames = 1; 562 while (bits % 8 != 0) { 563 bits *= 2; 564 frames *= 2; 565 } 566 runtime->byte_align = bits / 8; 567 runtime->min_align = frames; 568 569 /* Default sw params */ 570 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 571 runtime->period_step = 1; 572 runtime->control->avail_min = runtime->period_size; 573 runtime->start_threshold = 1; 574 runtime->stop_threshold = runtime->buffer_size; 575 runtime->silence_threshold = 0; 576 runtime->silence_size = 0; 577 runtime->boundary = runtime->buffer_size; 578 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 579 runtime->boundary *= 2; 580 581 snd_pcm_timer_resolution_change(substream); 582 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 583 584 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 585 pm_qos_remove_request(&substream->latency_pm_qos_req); 586 if ((usecs = period_to_usecs(runtime)) >= 0) 587 pm_qos_add_request(&substream->latency_pm_qos_req, 588 PM_QOS_CPU_DMA_LATENCY, usecs); 589 return 0; 590 _error: 591 /* hardware might be unusable from this time, 592 so we force application to retry to set 593 the correct hardware parameter settings */ 594 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 595 if (substream->ops->hw_free != NULL) 596 substream->ops->hw_free(substream); 597 return err; 598 } 599 600 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 601 struct snd_pcm_hw_params __user * _params) 602 { 603 struct snd_pcm_hw_params *params; 604 int err; 605 606 params = memdup_user(_params, sizeof(*params)); 607 if (IS_ERR(params)) 608 return PTR_ERR(params); 609 610 err = snd_pcm_hw_params(substream, params); 611 if (copy_to_user(_params, params, sizeof(*params))) { 612 if (!err) 613 err = -EFAULT; 614 } 615 616 kfree(params); 617 return err; 618 } 619 620 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 621 { 622 struct snd_pcm_runtime *runtime; 623 int result = 0; 624 625 if (PCM_RUNTIME_CHECK(substream)) 626 return -ENXIO; 627 runtime = substream->runtime; 628 snd_pcm_stream_lock_irq(substream); 629 switch (runtime->status->state) { 630 case SNDRV_PCM_STATE_SETUP: 631 case SNDRV_PCM_STATE_PREPARED: 632 break; 633 default: 634 snd_pcm_stream_unlock_irq(substream); 635 return -EBADFD; 636 } 637 snd_pcm_stream_unlock_irq(substream); 638 if (atomic_read(&substream->mmap_count)) 639 return -EBADFD; 640 if (substream->ops->hw_free) 641 result = substream->ops->hw_free(substream); 642 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 643 pm_qos_remove_request(&substream->latency_pm_qos_req); 644 return result; 645 } 646 647 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 648 struct snd_pcm_sw_params *params) 649 { 650 struct snd_pcm_runtime *runtime; 651 int err; 652 653 if (PCM_RUNTIME_CHECK(substream)) 654 return -ENXIO; 655 runtime = substream->runtime; 656 snd_pcm_stream_lock_irq(substream); 657 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 658 snd_pcm_stream_unlock_irq(substream); 659 return -EBADFD; 660 } 661 snd_pcm_stream_unlock_irq(substream); 662 663 if (params->tstamp_mode < 0 || 664 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 665 return -EINVAL; 666 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 667 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 668 return -EINVAL; 669 if (params->avail_min == 0) 670 return -EINVAL; 671 if (params->silence_size >= runtime->boundary) { 672 if (params->silence_threshold != 0) 673 return -EINVAL; 674 } else { 675 if (params->silence_size > params->silence_threshold) 676 return -EINVAL; 677 if (params->silence_threshold > runtime->buffer_size) 678 return -EINVAL; 679 } 680 err = 0; 681 snd_pcm_stream_lock_irq(substream); 682 runtime->tstamp_mode = params->tstamp_mode; 683 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 684 runtime->tstamp_type = params->tstamp_type; 685 runtime->period_step = params->period_step; 686 runtime->control->avail_min = params->avail_min; 687 runtime->start_threshold = params->start_threshold; 688 runtime->stop_threshold = params->stop_threshold; 689 runtime->silence_threshold = params->silence_threshold; 690 runtime->silence_size = params->silence_size; 691 params->boundary = runtime->boundary; 692 if (snd_pcm_running(substream)) { 693 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 694 runtime->silence_size > 0) 695 snd_pcm_playback_silence(substream, ULONG_MAX); 696 err = snd_pcm_update_state(substream, runtime); 697 } 698 snd_pcm_stream_unlock_irq(substream); 699 return err; 700 } 701 702 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 703 struct snd_pcm_sw_params __user * _params) 704 { 705 struct snd_pcm_sw_params params; 706 int err; 707 if (copy_from_user(¶ms, _params, sizeof(params))) 708 return -EFAULT; 709 err = snd_pcm_sw_params(substream, ¶ms); 710 if (copy_to_user(_params, ¶ms, sizeof(params))) 711 return -EFAULT; 712 return err; 713 } 714 715 int snd_pcm_status(struct snd_pcm_substream *substream, 716 struct snd_pcm_status *status) 717 { 718 struct snd_pcm_runtime *runtime = substream->runtime; 719 720 snd_pcm_stream_lock_irq(substream); 721 722 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 723 &runtime->audio_tstamp_config); 724 725 /* backwards compatible behavior */ 726 if (runtime->audio_tstamp_config.type_requested == 727 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 728 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 729 runtime->audio_tstamp_config.type_requested = 730 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 731 else 732 runtime->audio_tstamp_config.type_requested = 733 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 734 runtime->audio_tstamp_report.valid = 0; 735 } else 736 runtime->audio_tstamp_report.valid = 1; 737 738 status->state = runtime->status->state; 739 status->suspended_state = runtime->status->suspended_state; 740 if (status->state == SNDRV_PCM_STATE_OPEN) 741 goto _end; 742 status->trigger_tstamp = runtime->trigger_tstamp; 743 if (snd_pcm_running(substream)) { 744 snd_pcm_update_hw_ptr(substream); 745 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 746 status->tstamp = runtime->status->tstamp; 747 status->driver_tstamp = runtime->driver_tstamp; 748 status->audio_tstamp = 749 runtime->status->audio_tstamp; 750 if (runtime->audio_tstamp_report.valid == 1) 751 /* backwards compatibility, no report provided in COMPAT mode */ 752 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 753 &status->audio_tstamp_accuracy, 754 &runtime->audio_tstamp_report); 755 756 goto _tstamp_end; 757 } 758 } else { 759 /* get tstamp only in fallback mode and only if enabled */ 760 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 761 snd_pcm_gettime(runtime, &status->tstamp); 762 } 763 _tstamp_end: 764 status->appl_ptr = runtime->control->appl_ptr; 765 status->hw_ptr = runtime->status->hw_ptr; 766 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 767 status->avail = snd_pcm_playback_avail(runtime); 768 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 769 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 770 status->delay = runtime->buffer_size - status->avail; 771 status->delay += runtime->delay; 772 } else 773 status->delay = 0; 774 } else { 775 status->avail = snd_pcm_capture_avail(runtime); 776 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 777 status->delay = status->avail + runtime->delay; 778 else 779 status->delay = 0; 780 } 781 status->avail_max = runtime->avail_max; 782 status->overrange = runtime->overrange; 783 runtime->avail_max = 0; 784 runtime->overrange = 0; 785 _end: 786 snd_pcm_stream_unlock_irq(substream); 787 return 0; 788 } 789 790 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 791 struct snd_pcm_status __user * _status, 792 bool ext) 793 { 794 struct snd_pcm_status status; 795 int res; 796 797 memset(&status, 0, sizeof(status)); 798 /* 799 * with extension, parameters are read/write, 800 * get audio_tstamp_data from user, 801 * ignore rest of status structure 802 */ 803 if (ext && get_user(status.audio_tstamp_data, 804 (u32 __user *)(&_status->audio_tstamp_data))) 805 return -EFAULT; 806 res = snd_pcm_status(substream, &status); 807 if (res < 0) 808 return res; 809 if (copy_to_user(_status, &status, sizeof(status))) 810 return -EFAULT; 811 return 0; 812 } 813 814 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 815 struct snd_pcm_channel_info * info) 816 { 817 struct snd_pcm_runtime *runtime; 818 unsigned int channel; 819 820 channel = info->channel; 821 runtime = substream->runtime; 822 snd_pcm_stream_lock_irq(substream); 823 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 824 snd_pcm_stream_unlock_irq(substream); 825 return -EBADFD; 826 } 827 snd_pcm_stream_unlock_irq(substream); 828 if (channel >= runtime->channels) 829 return -EINVAL; 830 memset(info, 0, sizeof(*info)); 831 info->channel = channel; 832 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 833 } 834 835 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 836 struct snd_pcm_channel_info __user * _info) 837 { 838 struct snd_pcm_channel_info info; 839 int res; 840 841 if (copy_from_user(&info, _info, sizeof(info))) 842 return -EFAULT; 843 res = snd_pcm_channel_info(substream, &info); 844 if (res < 0) 845 return res; 846 if (copy_to_user(_info, &info, sizeof(info))) 847 return -EFAULT; 848 return 0; 849 } 850 851 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 852 { 853 struct snd_pcm_runtime *runtime = substream->runtime; 854 if (runtime->trigger_master == NULL) 855 return; 856 if (runtime->trigger_master == substream) { 857 if (!runtime->trigger_tstamp_latched) 858 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 859 } else { 860 snd_pcm_trigger_tstamp(runtime->trigger_master); 861 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 862 } 863 runtime->trigger_master = NULL; 864 } 865 866 struct action_ops { 867 int (*pre_action)(struct snd_pcm_substream *substream, int state); 868 int (*do_action)(struct snd_pcm_substream *substream, int state); 869 void (*undo_action)(struct snd_pcm_substream *substream, int state); 870 void (*post_action)(struct snd_pcm_substream *substream, int state); 871 }; 872 873 /* 874 * this functions is core for handling of linked stream 875 * Note: the stream state might be changed also on failure 876 * Note2: call with calling stream lock + link lock 877 */ 878 static int snd_pcm_action_group(struct action_ops *ops, 879 struct snd_pcm_substream *substream, 880 int state, int do_lock) 881 { 882 struct snd_pcm_substream *s = NULL; 883 struct snd_pcm_substream *s1; 884 int res = 0, depth = 1; 885 886 snd_pcm_group_for_each_entry(s, substream) { 887 if (do_lock && s != substream) { 888 if (s->pcm->nonatomic) 889 mutex_lock_nested(&s->self_group.mutex, depth); 890 else 891 spin_lock_nested(&s->self_group.lock, depth); 892 depth++; 893 } 894 res = ops->pre_action(s, state); 895 if (res < 0) 896 goto _unlock; 897 } 898 snd_pcm_group_for_each_entry(s, substream) { 899 res = ops->do_action(s, state); 900 if (res < 0) { 901 if (ops->undo_action) { 902 snd_pcm_group_for_each_entry(s1, substream) { 903 if (s1 == s) /* failed stream */ 904 break; 905 ops->undo_action(s1, state); 906 } 907 } 908 s = NULL; /* unlock all */ 909 goto _unlock; 910 } 911 } 912 snd_pcm_group_for_each_entry(s, substream) { 913 ops->post_action(s, state); 914 } 915 _unlock: 916 if (do_lock) { 917 /* unlock streams */ 918 snd_pcm_group_for_each_entry(s1, substream) { 919 if (s1 != substream) { 920 if (s1->pcm->nonatomic) 921 mutex_unlock(&s1->self_group.mutex); 922 else 923 spin_unlock(&s1->self_group.lock); 924 } 925 if (s1 == s) /* end */ 926 break; 927 } 928 } 929 return res; 930 } 931 932 /* 933 * Note: call with stream lock 934 */ 935 static int snd_pcm_action_single(struct action_ops *ops, 936 struct snd_pcm_substream *substream, 937 int state) 938 { 939 int res; 940 941 res = ops->pre_action(substream, state); 942 if (res < 0) 943 return res; 944 res = ops->do_action(substream, state); 945 if (res == 0) 946 ops->post_action(substream, state); 947 else if (ops->undo_action) 948 ops->undo_action(substream, state); 949 return res; 950 } 951 952 /* 953 * Note: call with stream lock 954 */ 955 static int snd_pcm_action(struct action_ops *ops, 956 struct snd_pcm_substream *substream, 957 int state) 958 { 959 int res; 960 961 if (!snd_pcm_stream_linked(substream)) 962 return snd_pcm_action_single(ops, substream, state); 963 964 if (substream->pcm->nonatomic) { 965 if (!mutex_trylock(&substream->group->mutex)) { 966 mutex_unlock(&substream->self_group.mutex); 967 mutex_lock(&substream->group->mutex); 968 mutex_lock(&substream->self_group.mutex); 969 } 970 res = snd_pcm_action_group(ops, substream, state, 1); 971 mutex_unlock(&substream->group->mutex); 972 } else { 973 if (!spin_trylock(&substream->group->lock)) { 974 spin_unlock(&substream->self_group.lock); 975 spin_lock(&substream->group->lock); 976 spin_lock(&substream->self_group.lock); 977 } 978 res = snd_pcm_action_group(ops, substream, state, 1); 979 spin_unlock(&substream->group->lock); 980 } 981 return res; 982 } 983 984 /* 985 * Note: don't use any locks before 986 */ 987 static int snd_pcm_action_lock_irq(struct action_ops *ops, 988 struct snd_pcm_substream *substream, 989 int state) 990 { 991 int res; 992 993 snd_pcm_stream_lock_irq(substream); 994 res = snd_pcm_action(ops, substream, state); 995 snd_pcm_stream_unlock_irq(substream); 996 return res; 997 } 998 999 /* 1000 */ 1001 static int snd_pcm_action_nonatomic(struct action_ops *ops, 1002 struct snd_pcm_substream *substream, 1003 int state) 1004 { 1005 int res; 1006 1007 down_read(&snd_pcm_link_rwsem); 1008 if (snd_pcm_stream_linked(substream)) 1009 res = snd_pcm_action_group(ops, substream, state, 0); 1010 else 1011 res = snd_pcm_action_single(ops, substream, state); 1012 up_read(&snd_pcm_link_rwsem); 1013 return res; 1014 } 1015 1016 /* 1017 * start callbacks 1018 */ 1019 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 1020 { 1021 struct snd_pcm_runtime *runtime = substream->runtime; 1022 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1023 return -EBADFD; 1024 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1025 !snd_pcm_playback_data(substream)) 1026 return -EPIPE; 1027 runtime->trigger_tstamp_latched = false; 1028 runtime->trigger_master = substream; 1029 return 0; 1030 } 1031 1032 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 1033 { 1034 if (substream->runtime->trigger_master != substream) 1035 return 0; 1036 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1037 } 1038 1039 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 1040 { 1041 if (substream->runtime->trigger_master == substream) 1042 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1043 } 1044 1045 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 1046 { 1047 struct snd_pcm_runtime *runtime = substream->runtime; 1048 snd_pcm_trigger_tstamp(substream); 1049 runtime->hw_ptr_jiffies = jiffies; 1050 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1051 runtime->rate; 1052 runtime->status->state = state; 1053 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1054 runtime->silence_size > 0) 1055 snd_pcm_playback_silence(substream, ULONG_MAX); 1056 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1057 } 1058 1059 static struct action_ops snd_pcm_action_start = { 1060 .pre_action = snd_pcm_pre_start, 1061 .do_action = snd_pcm_do_start, 1062 .undo_action = snd_pcm_undo_start, 1063 .post_action = snd_pcm_post_start 1064 }; 1065 1066 /** 1067 * snd_pcm_start - start all linked streams 1068 * @substream: the PCM substream instance 1069 * 1070 * Return: Zero if successful, or a negative error code. 1071 */ 1072 int snd_pcm_start(struct snd_pcm_substream *substream) 1073 { 1074 return snd_pcm_action(&snd_pcm_action_start, substream, 1075 SNDRV_PCM_STATE_RUNNING); 1076 } 1077 1078 /* 1079 * stop callbacks 1080 */ 1081 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1082 { 1083 struct snd_pcm_runtime *runtime = substream->runtime; 1084 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1085 return -EBADFD; 1086 runtime->trigger_master = substream; 1087 return 0; 1088 } 1089 1090 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1091 { 1092 if (substream->runtime->trigger_master == substream && 1093 snd_pcm_running(substream)) 1094 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1095 return 0; /* unconditonally stop all substreams */ 1096 } 1097 1098 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1099 { 1100 struct snd_pcm_runtime *runtime = substream->runtime; 1101 if (runtime->status->state != state) { 1102 snd_pcm_trigger_tstamp(substream); 1103 runtime->status->state = state; 1104 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1105 } 1106 wake_up(&runtime->sleep); 1107 wake_up(&runtime->tsleep); 1108 } 1109 1110 static struct action_ops snd_pcm_action_stop = { 1111 .pre_action = snd_pcm_pre_stop, 1112 .do_action = snd_pcm_do_stop, 1113 .post_action = snd_pcm_post_stop 1114 }; 1115 1116 /** 1117 * snd_pcm_stop - try to stop all running streams in the substream group 1118 * @substream: the PCM substream instance 1119 * @state: PCM state after stopping the stream 1120 * 1121 * The state of each stream is then changed to the given state unconditionally. 1122 * 1123 * Return: Zero if successful, or a negative error code. 1124 */ 1125 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1126 { 1127 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1128 } 1129 1130 EXPORT_SYMBOL(snd_pcm_stop); 1131 1132 /** 1133 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1134 * @substream: the PCM substream 1135 * 1136 * After stopping, the state is changed to SETUP. 1137 * Unlike snd_pcm_stop(), this affects only the given stream. 1138 * 1139 * Return: Zero if succesful, or a negative error code. 1140 */ 1141 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1142 { 1143 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1144 SNDRV_PCM_STATE_SETUP); 1145 } 1146 1147 /** 1148 * snd_pcm_stop_xrun - stop the running streams as XRUN 1149 * @substream: the PCM substream instance 1150 * 1151 * This stops the given running substream (and all linked substreams) as XRUN. 1152 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1153 * 1154 * Return: Zero if successful, or a negative error code. 1155 */ 1156 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1157 { 1158 unsigned long flags; 1159 int ret = 0; 1160 1161 snd_pcm_stream_lock_irqsave(substream, flags); 1162 if (snd_pcm_running(substream)) 1163 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1164 snd_pcm_stream_unlock_irqrestore(substream, flags); 1165 return ret; 1166 } 1167 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1168 1169 /* 1170 * pause callbacks 1171 */ 1172 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1173 { 1174 struct snd_pcm_runtime *runtime = substream->runtime; 1175 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1176 return -ENOSYS; 1177 if (push) { 1178 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1179 return -EBADFD; 1180 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1181 return -EBADFD; 1182 runtime->trigger_master = substream; 1183 return 0; 1184 } 1185 1186 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1187 { 1188 if (substream->runtime->trigger_master != substream) 1189 return 0; 1190 /* some drivers might use hw_ptr to recover from the pause - 1191 update the hw_ptr now */ 1192 if (push) 1193 snd_pcm_update_hw_ptr(substream); 1194 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1195 * a delta between the current jiffies, this gives a large enough 1196 * delta, effectively to skip the check once. 1197 */ 1198 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1199 return substream->ops->trigger(substream, 1200 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1201 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1202 } 1203 1204 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1205 { 1206 if (substream->runtime->trigger_master == substream) 1207 substream->ops->trigger(substream, 1208 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1209 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1210 } 1211 1212 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1213 { 1214 struct snd_pcm_runtime *runtime = substream->runtime; 1215 snd_pcm_trigger_tstamp(substream); 1216 if (push) { 1217 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1218 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1219 wake_up(&runtime->sleep); 1220 wake_up(&runtime->tsleep); 1221 } else { 1222 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1223 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1224 } 1225 } 1226 1227 static struct action_ops snd_pcm_action_pause = { 1228 .pre_action = snd_pcm_pre_pause, 1229 .do_action = snd_pcm_do_pause, 1230 .undo_action = snd_pcm_undo_pause, 1231 .post_action = snd_pcm_post_pause 1232 }; 1233 1234 /* 1235 * Push/release the pause for all linked streams. 1236 */ 1237 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1238 { 1239 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1240 } 1241 1242 #ifdef CONFIG_PM 1243 /* suspend */ 1244 1245 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1246 { 1247 struct snd_pcm_runtime *runtime = substream->runtime; 1248 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1249 return -EBUSY; 1250 runtime->trigger_master = substream; 1251 return 0; 1252 } 1253 1254 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1255 { 1256 struct snd_pcm_runtime *runtime = substream->runtime; 1257 if (runtime->trigger_master != substream) 1258 return 0; 1259 if (! snd_pcm_running(substream)) 1260 return 0; 1261 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1262 return 0; /* suspend unconditionally */ 1263 } 1264 1265 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1266 { 1267 struct snd_pcm_runtime *runtime = substream->runtime; 1268 snd_pcm_trigger_tstamp(substream); 1269 runtime->status->suspended_state = runtime->status->state; 1270 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1271 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1272 wake_up(&runtime->sleep); 1273 wake_up(&runtime->tsleep); 1274 } 1275 1276 static struct action_ops snd_pcm_action_suspend = { 1277 .pre_action = snd_pcm_pre_suspend, 1278 .do_action = snd_pcm_do_suspend, 1279 .post_action = snd_pcm_post_suspend 1280 }; 1281 1282 /** 1283 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1284 * @substream: the PCM substream 1285 * 1286 * After this call, all streams are changed to SUSPENDED state. 1287 * 1288 * Return: Zero if successful (or @substream is %NULL), or a negative error 1289 * code. 1290 */ 1291 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1292 { 1293 int err; 1294 unsigned long flags; 1295 1296 if (! substream) 1297 return 0; 1298 1299 snd_pcm_stream_lock_irqsave(substream, flags); 1300 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1301 snd_pcm_stream_unlock_irqrestore(substream, flags); 1302 return err; 1303 } 1304 1305 EXPORT_SYMBOL(snd_pcm_suspend); 1306 1307 /** 1308 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1309 * @pcm: the PCM instance 1310 * 1311 * After this call, all streams are changed to SUSPENDED state. 1312 * 1313 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1314 */ 1315 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1316 { 1317 struct snd_pcm_substream *substream; 1318 int stream, err = 0; 1319 1320 if (! pcm) 1321 return 0; 1322 1323 for (stream = 0; stream < 2; stream++) { 1324 for (substream = pcm->streams[stream].substream; 1325 substream; substream = substream->next) { 1326 /* FIXME: the open/close code should lock this as well */ 1327 if (substream->runtime == NULL) 1328 continue; 1329 err = snd_pcm_suspend(substream); 1330 if (err < 0 && err != -EBUSY) 1331 return err; 1332 } 1333 } 1334 return 0; 1335 } 1336 1337 EXPORT_SYMBOL(snd_pcm_suspend_all); 1338 1339 /* resume */ 1340 1341 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1342 { 1343 struct snd_pcm_runtime *runtime = substream->runtime; 1344 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1345 return -ENOSYS; 1346 runtime->trigger_master = substream; 1347 return 0; 1348 } 1349 1350 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1351 { 1352 struct snd_pcm_runtime *runtime = substream->runtime; 1353 if (runtime->trigger_master != substream) 1354 return 0; 1355 /* DMA not running previously? */ 1356 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1357 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1358 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1359 return 0; 1360 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1361 } 1362 1363 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1364 { 1365 if (substream->runtime->trigger_master == substream && 1366 snd_pcm_running(substream)) 1367 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1368 } 1369 1370 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1371 { 1372 struct snd_pcm_runtime *runtime = substream->runtime; 1373 snd_pcm_trigger_tstamp(substream); 1374 runtime->status->state = runtime->status->suspended_state; 1375 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1376 } 1377 1378 static struct action_ops snd_pcm_action_resume = { 1379 .pre_action = snd_pcm_pre_resume, 1380 .do_action = snd_pcm_do_resume, 1381 .undo_action = snd_pcm_undo_resume, 1382 .post_action = snd_pcm_post_resume 1383 }; 1384 1385 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1386 { 1387 struct snd_card *card = substream->pcm->card; 1388 int res; 1389 1390 snd_power_lock(card); 1391 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1392 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1393 snd_power_unlock(card); 1394 return res; 1395 } 1396 1397 #else 1398 1399 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1400 { 1401 return -ENOSYS; 1402 } 1403 1404 #endif /* CONFIG_PM */ 1405 1406 /* 1407 * xrun ioctl 1408 * 1409 * Change the RUNNING stream(s) to XRUN state. 1410 */ 1411 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1412 { 1413 struct snd_card *card = substream->pcm->card; 1414 struct snd_pcm_runtime *runtime = substream->runtime; 1415 int result; 1416 1417 snd_power_lock(card); 1418 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1419 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1420 if (result < 0) 1421 goto _unlock; 1422 } 1423 1424 snd_pcm_stream_lock_irq(substream); 1425 switch (runtime->status->state) { 1426 case SNDRV_PCM_STATE_XRUN: 1427 result = 0; /* already there */ 1428 break; 1429 case SNDRV_PCM_STATE_RUNNING: 1430 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1431 break; 1432 default: 1433 result = -EBADFD; 1434 } 1435 snd_pcm_stream_unlock_irq(substream); 1436 _unlock: 1437 snd_power_unlock(card); 1438 return result; 1439 } 1440 1441 /* 1442 * reset ioctl 1443 */ 1444 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1445 { 1446 struct snd_pcm_runtime *runtime = substream->runtime; 1447 switch (runtime->status->state) { 1448 case SNDRV_PCM_STATE_RUNNING: 1449 case SNDRV_PCM_STATE_PREPARED: 1450 case SNDRV_PCM_STATE_PAUSED: 1451 case SNDRV_PCM_STATE_SUSPENDED: 1452 return 0; 1453 default: 1454 return -EBADFD; 1455 } 1456 } 1457 1458 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1459 { 1460 struct snd_pcm_runtime *runtime = substream->runtime; 1461 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1462 if (err < 0) 1463 return err; 1464 runtime->hw_ptr_base = 0; 1465 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1466 runtime->status->hw_ptr % runtime->period_size; 1467 runtime->silence_start = runtime->status->hw_ptr; 1468 runtime->silence_filled = 0; 1469 return 0; 1470 } 1471 1472 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1473 { 1474 struct snd_pcm_runtime *runtime = substream->runtime; 1475 runtime->control->appl_ptr = runtime->status->hw_ptr; 1476 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1477 runtime->silence_size > 0) 1478 snd_pcm_playback_silence(substream, ULONG_MAX); 1479 } 1480 1481 static struct action_ops snd_pcm_action_reset = { 1482 .pre_action = snd_pcm_pre_reset, 1483 .do_action = snd_pcm_do_reset, 1484 .post_action = snd_pcm_post_reset 1485 }; 1486 1487 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1488 { 1489 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1490 } 1491 1492 /* 1493 * prepare ioctl 1494 */ 1495 /* we use the second argument for updating f_flags */ 1496 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1497 int f_flags) 1498 { 1499 struct snd_pcm_runtime *runtime = substream->runtime; 1500 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1501 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1502 return -EBADFD; 1503 if (snd_pcm_running(substream)) 1504 return -EBUSY; 1505 substream->f_flags = f_flags; 1506 return 0; 1507 } 1508 1509 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1510 { 1511 int err; 1512 err = substream->ops->prepare(substream); 1513 if (err < 0) 1514 return err; 1515 return snd_pcm_do_reset(substream, 0); 1516 } 1517 1518 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1519 { 1520 struct snd_pcm_runtime *runtime = substream->runtime; 1521 runtime->control->appl_ptr = runtime->status->hw_ptr; 1522 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1523 } 1524 1525 static struct action_ops snd_pcm_action_prepare = { 1526 .pre_action = snd_pcm_pre_prepare, 1527 .do_action = snd_pcm_do_prepare, 1528 .post_action = snd_pcm_post_prepare 1529 }; 1530 1531 /** 1532 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1533 * @substream: the PCM substream instance 1534 * @file: file to refer f_flags 1535 * 1536 * Return: Zero if successful, or a negative error code. 1537 */ 1538 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1539 struct file *file) 1540 { 1541 int res; 1542 struct snd_card *card = substream->pcm->card; 1543 int f_flags; 1544 1545 if (file) 1546 f_flags = file->f_flags; 1547 else 1548 f_flags = substream->f_flags; 1549 1550 snd_power_lock(card); 1551 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1552 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1553 substream, f_flags); 1554 snd_power_unlock(card); 1555 return res; 1556 } 1557 1558 /* 1559 * drain ioctl 1560 */ 1561 1562 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1563 { 1564 struct snd_pcm_runtime *runtime = substream->runtime; 1565 switch (runtime->status->state) { 1566 case SNDRV_PCM_STATE_OPEN: 1567 case SNDRV_PCM_STATE_DISCONNECTED: 1568 case SNDRV_PCM_STATE_SUSPENDED: 1569 return -EBADFD; 1570 } 1571 runtime->trigger_master = substream; 1572 return 0; 1573 } 1574 1575 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1576 { 1577 struct snd_pcm_runtime *runtime = substream->runtime; 1578 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1579 switch (runtime->status->state) { 1580 case SNDRV_PCM_STATE_PREPARED: 1581 /* start playback stream if possible */ 1582 if (! snd_pcm_playback_empty(substream)) { 1583 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1584 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1585 } else { 1586 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1587 } 1588 break; 1589 case SNDRV_PCM_STATE_RUNNING: 1590 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1591 break; 1592 case SNDRV_PCM_STATE_XRUN: 1593 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1594 break; 1595 default: 1596 break; 1597 } 1598 } else { 1599 /* stop running stream */ 1600 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1601 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1602 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1603 snd_pcm_do_stop(substream, new_state); 1604 snd_pcm_post_stop(substream, new_state); 1605 } 1606 } 1607 1608 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1609 runtime->trigger_master == substream && 1610 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1611 return substream->ops->trigger(substream, 1612 SNDRV_PCM_TRIGGER_DRAIN); 1613 1614 return 0; 1615 } 1616 1617 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1618 { 1619 } 1620 1621 static struct action_ops snd_pcm_action_drain_init = { 1622 .pre_action = snd_pcm_pre_drain_init, 1623 .do_action = snd_pcm_do_drain_init, 1624 .post_action = snd_pcm_post_drain_init 1625 }; 1626 1627 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1628 1629 /* 1630 * Drain the stream(s). 1631 * When the substream is linked, sync until the draining of all playback streams 1632 * is finished. 1633 * After this call, all streams are supposed to be either SETUP or DRAINING 1634 * (capture only) state. 1635 */ 1636 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1637 struct file *file) 1638 { 1639 struct snd_card *card; 1640 struct snd_pcm_runtime *runtime; 1641 struct snd_pcm_substream *s; 1642 wait_queue_t wait; 1643 int result = 0; 1644 int nonblock = 0; 1645 1646 card = substream->pcm->card; 1647 runtime = substream->runtime; 1648 1649 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1650 return -EBADFD; 1651 1652 snd_power_lock(card); 1653 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1654 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1655 if (result < 0) { 1656 snd_power_unlock(card); 1657 return result; 1658 } 1659 } 1660 1661 if (file) { 1662 if (file->f_flags & O_NONBLOCK) 1663 nonblock = 1; 1664 } else if (substream->f_flags & O_NONBLOCK) 1665 nonblock = 1; 1666 1667 down_read(&snd_pcm_link_rwsem); 1668 snd_pcm_stream_lock_irq(substream); 1669 /* resume pause */ 1670 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1671 snd_pcm_pause(substream, 0); 1672 1673 /* pre-start/stop - all running streams are changed to DRAINING state */ 1674 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1675 if (result < 0) 1676 goto unlock; 1677 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1678 if (nonblock) { 1679 result = -EAGAIN; 1680 goto unlock; 1681 } 1682 1683 for (;;) { 1684 long tout; 1685 struct snd_pcm_runtime *to_check; 1686 if (signal_pending(current)) { 1687 result = -ERESTARTSYS; 1688 break; 1689 } 1690 /* find a substream to drain */ 1691 to_check = NULL; 1692 snd_pcm_group_for_each_entry(s, substream) { 1693 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1694 continue; 1695 runtime = s->runtime; 1696 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1697 to_check = runtime; 1698 break; 1699 } 1700 } 1701 if (!to_check) 1702 break; /* all drained */ 1703 init_waitqueue_entry(&wait, current); 1704 add_wait_queue(&to_check->sleep, &wait); 1705 snd_pcm_stream_unlock_irq(substream); 1706 up_read(&snd_pcm_link_rwsem); 1707 snd_power_unlock(card); 1708 if (runtime->no_period_wakeup) 1709 tout = MAX_SCHEDULE_TIMEOUT; 1710 else { 1711 tout = 10; 1712 if (runtime->rate) { 1713 long t = runtime->period_size * 2 / runtime->rate; 1714 tout = max(t, tout); 1715 } 1716 tout = msecs_to_jiffies(tout * 1000); 1717 } 1718 tout = schedule_timeout_interruptible(tout); 1719 snd_power_lock(card); 1720 down_read(&snd_pcm_link_rwsem); 1721 snd_pcm_stream_lock_irq(substream); 1722 remove_wait_queue(&to_check->sleep, &wait); 1723 if (card->shutdown) { 1724 result = -ENODEV; 1725 break; 1726 } 1727 if (tout == 0) { 1728 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1729 result = -ESTRPIPE; 1730 else { 1731 dev_dbg(substream->pcm->card->dev, 1732 "playback drain error (DMA or IRQ trouble?)\n"); 1733 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1734 result = -EIO; 1735 } 1736 break; 1737 } 1738 } 1739 1740 unlock: 1741 snd_pcm_stream_unlock_irq(substream); 1742 up_read(&snd_pcm_link_rwsem); 1743 snd_power_unlock(card); 1744 1745 return result; 1746 } 1747 1748 /* 1749 * drop ioctl 1750 * 1751 * Immediately put all linked substreams into SETUP state. 1752 */ 1753 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1754 { 1755 struct snd_pcm_runtime *runtime; 1756 int result = 0; 1757 1758 if (PCM_RUNTIME_CHECK(substream)) 1759 return -ENXIO; 1760 runtime = substream->runtime; 1761 1762 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1763 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1764 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1765 return -EBADFD; 1766 1767 snd_pcm_stream_lock_irq(substream); 1768 /* resume pause */ 1769 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1770 snd_pcm_pause(substream, 0); 1771 1772 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1773 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1774 snd_pcm_stream_unlock_irq(substream); 1775 1776 return result; 1777 } 1778 1779 1780 static bool is_pcm_file(struct file *file) 1781 { 1782 struct inode *inode = file_inode(file); 1783 unsigned int minor; 1784 1785 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1786 return false; 1787 minor = iminor(inode); 1788 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1789 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1790 } 1791 1792 /* 1793 * PCM link handling 1794 */ 1795 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1796 { 1797 int res = 0; 1798 struct snd_pcm_file *pcm_file; 1799 struct snd_pcm_substream *substream1; 1800 struct snd_pcm_group *group; 1801 struct fd f = fdget(fd); 1802 1803 if (!f.file) 1804 return -EBADFD; 1805 if (!is_pcm_file(f.file)) { 1806 res = -EBADFD; 1807 goto _badf; 1808 } 1809 pcm_file = f.file->private_data; 1810 substream1 = pcm_file->substream; 1811 group = kmalloc(sizeof(*group), GFP_KERNEL); 1812 if (!group) { 1813 res = -ENOMEM; 1814 goto _nolock; 1815 } 1816 down_write(&snd_pcm_link_rwsem); 1817 write_lock_irq(&snd_pcm_link_rwlock); 1818 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1819 substream->runtime->status->state != substream1->runtime->status->state || 1820 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1821 res = -EBADFD; 1822 goto _end; 1823 } 1824 if (snd_pcm_stream_linked(substream1)) { 1825 res = -EALREADY; 1826 goto _end; 1827 } 1828 if (!snd_pcm_stream_linked(substream)) { 1829 substream->group = group; 1830 group = NULL; 1831 spin_lock_init(&substream->group->lock); 1832 mutex_init(&substream->group->mutex); 1833 INIT_LIST_HEAD(&substream->group->substreams); 1834 list_add_tail(&substream->link_list, &substream->group->substreams); 1835 substream->group->count = 1; 1836 } 1837 list_add_tail(&substream1->link_list, &substream->group->substreams); 1838 substream->group->count++; 1839 substream1->group = substream->group; 1840 _end: 1841 write_unlock_irq(&snd_pcm_link_rwlock); 1842 up_write(&snd_pcm_link_rwsem); 1843 _nolock: 1844 snd_card_unref(substream1->pcm->card); 1845 kfree(group); 1846 _badf: 1847 fdput(f); 1848 return res; 1849 } 1850 1851 static void relink_to_local(struct snd_pcm_substream *substream) 1852 { 1853 substream->group = &substream->self_group; 1854 INIT_LIST_HEAD(&substream->self_group.substreams); 1855 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1856 } 1857 1858 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1859 { 1860 struct snd_pcm_substream *s; 1861 int res = 0; 1862 1863 down_write(&snd_pcm_link_rwsem); 1864 write_lock_irq(&snd_pcm_link_rwlock); 1865 if (!snd_pcm_stream_linked(substream)) { 1866 res = -EALREADY; 1867 goto _end; 1868 } 1869 list_del(&substream->link_list); 1870 substream->group->count--; 1871 if (substream->group->count == 1) { /* detach the last stream, too */ 1872 snd_pcm_group_for_each_entry(s, substream) { 1873 relink_to_local(s); 1874 break; 1875 } 1876 kfree(substream->group); 1877 } 1878 relink_to_local(substream); 1879 _end: 1880 write_unlock_irq(&snd_pcm_link_rwlock); 1881 up_write(&snd_pcm_link_rwsem); 1882 return res; 1883 } 1884 1885 /* 1886 * hw configurator 1887 */ 1888 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1889 struct snd_pcm_hw_rule *rule) 1890 { 1891 struct snd_interval t; 1892 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1893 hw_param_interval_c(params, rule->deps[1]), &t); 1894 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1895 } 1896 1897 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1898 struct snd_pcm_hw_rule *rule) 1899 { 1900 struct snd_interval t; 1901 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1902 hw_param_interval_c(params, rule->deps[1]), &t); 1903 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1904 } 1905 1906 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1907 struct snd_pcm_hw_rule *rule) 1908 { 1909 struct snd_interval t; 1910 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1911 hw_param_interval_c(params, rule->deps[1]), 1912 (unsigned long) rule->private, &t); 1913 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1914 } 1915 1916 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1917 struct snd_pcm_hw_rule *rule) 1918 { 1919 struct snd_interval t; 1920 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1921 (unsigned long) rule->private, 1922 hw_param_interval_c(params, rule->deps[1]), &t); 1923 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1924 } 1925 1926 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1927 struct snd_pcm_hw_rule *rule) 1928 { 1929 unsigned int k; 1930 struct snd_interval *i = hw_param_interval(params, rule->deps[0]); 1931 struct snd_mask m; 1932 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1933 snd_mask_any(&m); 1934 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1935 int bits; 1936 if (! snd_mask_test(mask, k)) 1937 continue; 1938 bits = snd_pcm_format_physical_width(k); 1939 if (bits <= 0) 1940 continue; /* ignore invalid formats */ 1941 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1942 snd_mask_reset(&m, k); 1943 } 1944 return snd_mask_refine(mask, &m); 1945 } 1946 1947 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1948 struct snd_pcm_hw_rule *rule) 1949 { 1950 struct snd_interval t; 1951 unsigned int k; 1952 t.min = UINT_MAX; 1953 t.max = 0; 1954 t.openmin = 0; 1955 t.openmax = 0; 1956 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1957 int bits; 1958 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1959 continue; 1960 bits = snd_pcm_format_physical_width(k); 1961 if (bits <= 0) 1962 continue; /* ignore invalid formats */ 1963 if (t.min > (unsigned)bits) 1964 t.min = bits; 1965 if (t.max < (unsigned)bits) 1966 t.max = bits; 1967 } 1968 t.integer = 1; 1969 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1970 } 1971 1972 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1973 #error "Change this table" 1974 #endif 1975 1976 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1977 48000, 64000, 88200, 96000, 176400, 192000 }; 1978 1979 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1980 .count = ARRAY_SIZE(rates), 1981 .list = rates, 1982 }; 1983 1984 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1985 struct snd_pcm_hw_rule *rule) 1986 { 1987 struct snd_pcm_hardware *hw = rule->private; 1988 return snd_interval_list(hw_param_interval(params, rule->var), 1989 snd_pcm_known_rates.count, 1990 snd_pcm_known_rates.list, hw->rates); 1991 } 1992 1993 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1994 struct snd_pcm_hw_rule *rule) 1995 { 1996 struct snd_interval t; 1997 struct snd_pcm_substream *substream = rule->private; 1998 t.min = 0; 1999 t.max = substream->buffer_bytes_max; 2000 t.openmin = 0; 2001 t.openmax = 0; 2002 t.integer = 1; 2003 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2004 } 2005 2006 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2007 { 2008 struct snd_pcm_runtime *runtime = substream->runtime; 2009 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2010 int k, err; 2011 2012 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2013 snd_mask_any(constrs_mask(constrs, k)); 2014 } 2015 2016 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2017 snd_interval_any(constrs_interval(constrs, k)); 2018 } 2019 2020 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2021 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2022 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2023 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2024 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2025 2026 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2027 snd_pcm_hw_rule_format, NULL, 2028 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2029 if (err < 0) 2030 return err; 2031 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2032 snd_pcm_hw_rule_sample_bits, NULL, 2033 SNDRV_PCM_HW_PARAM_FORMAT, 2034 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2035 if (err < 0) 2036 return err; 2037 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2038 snd_pcm_hw_rule_div, NULL, 2039 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2040 if (err < 0) 2041 return err; 2042 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2043 snd_pcm_hw_rule_mul, NULL, 2044 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2045 if (err < 0) 2046 return err; 2047 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2048 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2049 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2050 if (err < 0) 2051 return err; 2052 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2053 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2054 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2055 if (err < 0) 2056 return err; 2057 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2058 snd_pcm_hw_rule_div, NULL, 2059 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2060 if (err < 0) 2061 return err; 2062 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2063 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2064 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2065 if (err < 0) 2066 return err; 2067 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2068 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2069 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2070 if (err < 0) 2071 return err; 2072 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2073 snd_pcm_hw_rule_div, NULL, 2074 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2075 if (err < 0) 2076 return err; 2077 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2078 snd_pcm_hw_rule_div, NULL, 2079 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2080 if (err < 0) 2081 return err; 2082 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2083 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2084 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2085 if (err < 0) 2086 return err; 2087 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2088 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2089 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2090 if (err < 0) 2091 return err; 2092 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2093 snd_pcm_hw_rule_mul, NULL, 2094 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2095 if (err < 0) 2096 return err; 2097 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2098 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2099 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2100 if (err < 0) 2101 return err; 2102 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2103 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2104 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2105 if (err < 0) 2106 return err; 2107 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2108 snd_pcm_hw_rule_muldivk, (void*) 8, 2109 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2110 if (err < 0) 2111 return err; 2112 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2113 snd_pcm_hw_rule_muldivk, (void*) 8, 2114 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2115 if (err < 0) 2116 return err; 2117 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2118 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2119 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2120 if (err < 0) 2121 return err; 2122 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2123 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2124 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2125 if (err < 0) 2126 return err; 2127 return 0; 2128 } 2129 2130 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2131 { 2132 struct snd_pcm_runtime *runtime = substream->runtime; 2133 struct snd_pcm_hardware *hw = &runtime->hw; 2134 int err; 2135 unsigned int mask = 0; 2136 2137 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2138 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2139 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2140 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2141 if (hw_support_mmap(substream)) { 2142 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2143 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2144 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2145 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2146 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2147 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2148 } 2149 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2150 if (err < 0) 2151 return err; 2152 2153 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2154 if (err < 0) 2155 return err; 2156 2157 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2158 if (err < 0) 2159 return err; 2160 2161 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2162 hw->channels_min, hw->channels_max); 2163 if (err < 0) 2164 return err; 2165 2166 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2167 hw->rate_min, hw->rate_max); 2168 if (err < 0) 2169 return err; 2170 2171 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2172 hw->period_bytes_min, hw->period_bytes_max); 2173 if (err < 0) 2174 return err; 2175 2176 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2177 hw->periods_min, hw->periods_max); 2178 if (err < 0) 2179 return err; 2180 2181 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2182 hw->period_bytes_min, hw->buffer_bytes_max); 2183 if (err < 0) 2184 return err; 2185 2186 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2187 snd_pcm_hw_rule_buffer_bytes_max, substream, 2188 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2189 if (err < 0) 2190 return err; 2191 2192 /* FIXME: remove */ 2193 if (runtime->dma_bytes) { 2194 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2195 if (err < 0) 2196 return err; 2197 } 2198 2199 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2200 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2201 snd_pcm_hw_rule_rate, hw, 2202 SNDRV_PCM_HW_PARAM_RATE, -1); 2203 if (err < 0) 2204 return err; 2205 } 2206 2207 /* FIXME: this belong to lowlevel */ 2208 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2209 2210 return 0; 2211 } 2212 2213 static void pcm_release_private(struct snd_pcm_substream *substream) 2214 { 2215 snd_pcm_unlink(substream); 2216 } 2217 2218 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2219 { 2220 substream->ref_count--; 2221 if (substream->ref_count > 0) 2222 return; 2223 2224 snd_pcm_drop(substream); 2225 if (substream->hw_opened) { 2226 if (substream->ops->hw_free && 2227 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2228 substream->ops->hw_free(substream); 2229 substream->ops->close(substream); 2230 substream->hw_opened = 0; 2231 } 2232 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2233 pm_qos_remove_request(&substream->latency_pm_qos_req); 2234 if (substream->pcm_release) { 2235 substream->pcm_release(substream); 2236 substream->pcm_release = NULL; 2237 } 2238 snd_pcm_detach_substream(substream); 2239 } 2240 2241 EXPORT_SYMBOL(snd_pcm_release_substream); 2242 2243 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2244 struct file *file, 2245 struct snd_pcm_substream **rsubstream) 2246 { 2247 struct snd_pcm_substream *substream; 2248 int err; 2249 2250 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2251 if (err < 0) 2252 return err; 2253 if (substream->ref_count > 1) { 2254 *rsubstream = substream; 2255 return 0; 2256 } 2257 2258 err = snd_pcm_hw_constraints_init(substream); 2259 if (err < 0) { 2260 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2261 goto error; 2262 } 2263 2264 if ((err = substream->ops->open(substream)) < 0) 2265 goto error; 2266 2267 substream->hw_opened = 1; 2268 2269 err = snd_pcm_hw_constraints_complete(substream); 2270 if (err < 0) { 2271 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2272 goto error; 2273 } 2274 2275 *rsubstream = substream; 2276 return 0; 2277 2278 error: 2279 snd_pcm_release_substream(substream); 2280 return err; 2281 } 2282 2283 EXPORT_SYMBOL(snd_pcm_open_substream); 2284 2285 static int snd_pcm_open_file(struct file *file, 2286 struct snd_pcm *pcm, 2287 int stream) 2288 { 2289 struct snd_pcm_file *pcm_file; 2290 struct snd_pcm_substream *substream; 2291 int err; 2292 2293 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2294 if (err < 0) 2295 return err; 2296 2297 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2298 if (pcm_file == NULL) { 2299 snd_pcm_release_substream(substream); 2300 return -ENOMEM; 2301 } 2302 pcm_file->substream = substream; 2303 if (substream->ref_count == 1) { 2304 substream->file = pcm_file; 2305 substream->pcm_release = pcm_release_private; 2306 } 2307 file->private_data = pcm_file; 2308 2309 return 0; 2310 } 2311 2312 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2313 { 2314 struct snd_pcm *pcm; 2315 int err = nonseekable_open(inode, file); 2316 if (err < 0) 2317 return err; 2318 pcm = snd_lookup_minor_data(iminor(inode), 2319 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2320 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2321 if (pcm) 2322 snd_card_unref(pcm->card); 2323 return err; 2324 } 2325 2326 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2327 { 2328 struct snd_pcm *pcm; 2329 int err = nonseekable_open(inode, file); 2330 if (err < 0) 2331 return err; 2332 pcm = snd_lookup_minor_data(iminor(inode), 2333 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2334 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2335 if (pcm) 2336 snd_card_unref(pcm->card); 2337 return err; 2338 } 2339 2340 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2341 { 2342 int err; 2343 wait_queue_t wait; 2344 2345 if (pcm == NULL) { 2346 err = -ENODEV; 2347 goto __error1; 2348 } 2349 err = snd_card_file_add(pcm->card, file); 2350 if (err < 0) 2351 goto __error1; 2352 if (!try_module_get(pcm->card->module)) { 2353 err = -EFAULT; 2354 goto __error2; 2355 } 2356 init_waitqueue_entry(&wait, current); 2357 add_wait_queue(&pcm->open_wait, &wait); 2358 mutex_lock(&pcm->open_mutex); 2359 while (1) { 2360 err = snd_pcm_open_file(file, pcm, stream); 2361 if (err >= 0) 2362 break; 2363 if (err == -EAGAIN) { 2364 if (file->f_flags & O_NONBLOCK) { 2365 err = -EBUSY; 2366 break; 2367 } 2368 } else 2369 break; 2370 set_current_state(TASK_INTERRUPTIBLE); 2371 mutex_unlock(&pcm->open_mutex); 2372 schedule(); 2373 mutex_lock(&pcm->open_mutex); 2374 if (pcm->card->shutdown) { 2375 err = -ENODEV; 2376 break; 2377 } 2378 if (signal_pending(current)) { 2379 err = -ERESTARTSYS; 2380 break; 2381 } 2382 } 2383 remove_wait_queue(&pcm->open_wait, &wait); 2384 mutex_unlock(&pcm->open_mutex); 2385 if (err < 0) 2386 goto __error; 2387 return err; 2388 2389 __error: 2390 module_put(pcm->card->module); 2391 __error2: 2392 snd_card_file_remove(pcm->card, file); 2393 __error1: 2394 return err; 2395 } 2396 2397 static int snd_pcm_release(struct inode *inode, struct file *file) 2398 { 2399 struct snd_pcm *pcm; 2400 struct snd_pcm_substream *substream; 2401 struct snd_pcm_file *pcm_file; 2402 2403 pcm_file = file->private_data; 2404 substream = pcm_file->substream; 2405 if (snd_BUG_ON(!substream)) 2406 return -ENXIO; 2407 pcm = substream->pcm; 2408 mutex_lock(&pcm->open_mutex); 2409 snd_pcm_release_substream(substream); 2410 kfree(pcm_file); 2411 mutex_unlock(&pcm->open_mutex); 2412 wake_up(&pcm->open_wait); 2413 module_put(pcm->card->module); 2414 snd_card_file_remove(pcm->card, file); 2415 return 0; 2416 } 2417 2418 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2419 snd_pcm_uframes_t frames) 2420 { 2421 struct snd_pcm_runtime *runtime = substream->runtime; 2422 snd_pcm_sframes_t appl_ptr; 2423 snd_pcm_sframes_t ret; 2424 snd_pcm_sframes_t hw_avail; 2425 2426 if (frames == 0) 2427 return 0; 2428 2429 snd_pcm_stream_lock_irq(substream); 2430 switch (runtime->status->state) { 2431 case SNDRV_PCM_STATE_PREPARED: 2432 break; 2433 case SNDRV_PCM_STATE_DRAINING: 2434 case SNDRV_PCM_STATE_RUNNING: 2435 if (snd_pcm_update_hw_ptr(substream) >= 0) 2436 break; 2437 /* Fall through */ 2438 case SNDRV_PCM_STATE_XRUN: 2439 ret = -EPIPE; 2440 goto __end; 2441 case SNDRV_PCM_STATE_SUSPENDED: 2442 ret = -ESTRPIPE; 2443 goto __end; 2444 default: 2445 ret = -EBADFD; 2446 goto __end; 2447 } 2448 2449 hw_avail = snd_pcm_playback_hw_avail(runtime); 2450 if (hw_avail <= 0) { 2451 ret = 0; 2452 goto __end; 2453 } 2454 if (frames > (snd_pcm_uframes_t)hw_avail) 2455 frames = hw_avail; 2456 appl_ptr = runtime->control->appl_ptr - frames; 2457 if (appl_ptr < 0) 2458 appl_ptr += runtime->boundary; 2459 runtime->control->appl_ptr = appl_ptr; 2460 ret = frames; 2461 __end: 2462 snd_pcm_stream_unlock_irq(substream); 2463 return ret; 2464 } 2465 2466 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2467 snd_pcm_uframes_t frames) 2468 { 2469 struct snd_pcm_runtime *runtime = substream->runtime; 2470 snd_pcm_sframes_t appl_ptr; 2471 snd_pcm_sframes_t ret; 2472 snd_pcm_sframes_t hw_avail; 2473 2474 if (frames == 0) 2475 return 0; 2476 2477 snd_pcm_stream_lock_irq(substream); 2478 switch (runtime->status->state) { 2479 case SNDRV_PCM_STATE_PREPARED: 2480 case SNDRV_PCM_STATE_DRAINING: 2481 break; 2482 case SNDRV_PCM_STATE_RUNNING: 2483 if (snd_pcm_update_hw_ptr(substream) >= 0) 2484 break; 2485 /* Fall through */ 2486 case SNDRV_PCM_STATE_XRUN: 2487 ret = -EPIPE; 2488 goto __end; 2489 case SNDRV_PCM_STATE_SUSPENDED: 2490 ret = -ESTRPIPE; 2491 goto __end; 2492 default: 2493 ret = -EBADFD; 2494 goto __end; 2495 } 2496 2497 hw_avail = snd_pcm_capture_hw_avail(runtime); 2498 if (hw_avail <= 0) { 2499 ret = 0; 2500 goto __end; 2501 } 2502 if (frames > (snd_pcm_uframes_t)hw_avail) 2503 frames = hw_avail; 2504 appl_ptr = runtime->control->appl_ptr - frames; 2505 if (appl_ptr < 0) 2506 appl_ptr += runtime->boundary; 2507 runtime->control->appl_ptr = appl_ptr; 2508 ret = frames; 2509 __end: 2510 snd_pcm_stream_unlock_irq(substream); 2511 return ret; 2512 } 2513 2514 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2515 snd_pcm_uframes_t frames) 2516 { 2517 struct snd_pcm_runtime *runtime = substream->runtime; 2518 snd_pcm_sframes_t appl_ptr; 2519 snd_pcm_sframes_t ret; 2520 snd_pcm_sframes_t avail; 2521 2522 if (frames == 0) 2523 return 0; 2524 2525 snd_pcm_stream_lock_irq(substream); 2526 switch (runtime->status->state) { 2527 case SNDRV_PCM_STATE_PREPARED: 2528 case SNDRV_PCM_STATE_PAUSED: 2529 break; 2530 case SNDRV_PCM_STATE_DRAINING: 2531 case SNDRV_PCM_STATE_RUNNING: 2532 if (snd_pcm_update_hw_ptr(substream) >= 0) 2533 break; 2534 /* Fall through */ 2535 case SNDRV_PCM_STATE_XRUN: 2536 ret = -EPIPE; 2537 goto __end; 2538 case SNDRV_PCM_STATE_SUSPENDED: 2539 ret = -ESTRPIPE; 2540 goto __end; 2541 default: 2542 ret = -EBADFD; 2543 goto __end; 2544 } 2545 2546 avail = snd_pcm_playback_avail(runtime); 2547 if (avail <= 0) { 2548 ret = 0; 2549 goto __end; 2550 } 2551 if (frames > (snd_pcm_uframes_t)avail) 2552 frames = avail; 2553 appl_ptr = runtime->control->appl_ptr + frames; 2554 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2555 appl_ptr -= runtime->boundary; 2556 runtime->control->appl_ptr = appl_ptr; 2557 ret = frames; 2558 __end: 2559 snd_pcm_stream_unlock_irq(substream); 2560 return ret; 2561 } 2562 2563 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2564 snd_pcm_uframes_t frames) 2565 { 2566 struct snd_pcm_runtime *runtime = substream->runtime; 2567 snd_pcm_sframes_t appl_ptr; 2568 snd_pcm_sframes_t ret; 2569 snd_pcm_sframes_t avail; 2570 2571 if (frames == 0) 2572 return 0; 2573 2574 snd_pcm_stream_lock_irq(substream); 2575 switch (runtime->status->state) { 2576 case SNDRV_PCM_STATE_PREPARED: 2577 case SNDRV_PCM_STATE_DRAINING: 2578 case SNDRV_PCM_STATE_PAUSED: 2579 break; 2580 case SNDRV_PCM_STATE_RUNNING: 2581 if (snd_pcm_update_hw_ptr(substream) >= 0) 2582 break; 2583 /* Fall through */ 2584 case SNDRV_PCM_STATE_XRUN: 2585 ret = -EPIPE; 2586 goto __end; 2587 case SNDRV_PCM_STATE_SUSPENDED: 2588 ret = -ESTRPIPE; 2589 goto __end; 2590 default: 2591 ret = -EBADFD; 2592 goto __end; 2593 } 2594 2595 avail = snd_pcm_capture_avail(runtime); 2596 if (avail <= 0) { 2597 ret = 0; 2598 goto __end; 2599 } 2600 if (frames > (snd_pcm_uframes_t)avail) 2601 frames = avail; 2602 appl_ptr = runtime->control->appl_ptr + frames; 2603 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2604 appl_ptr -= runtime->boundary; 2605 runtime->control->appl_ptr = appl_ptr; 2606 ret = frames; 2607 __end: 2608 snd_pcm_stream_unlock_irq(substream); 2609 return ret; 2610 } 2611 2612 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2613 { 2614 struct snd_pcm_runtime *runtime = substream->runtime; 2615 int err; 2616 2617 snd_pcm_stream_lock_irq(substream); 2618 switch (runtime->status->state) { 2619 case SNDRV_PCM_STATE_DRAINING: 2620 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2621 goto __badfd; 2622 /* Fall through */ 2623 case SNDRV_PCM_STATE_RUNNING: 2624 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2625 break; 2626 /* Fall through */ 2627 case SNDRV_PCM_STATE_PREPARED: 2628 case SNDRV_PCM_STATE_SUSPENDED: 2629 err = 0; 2630 break; 2631 case SNDRV_PCM_STATE_XRUN: 2632 err = -EPIPE; 2633 break; 2634 default: 2635 __badfd: 2636 err = -EBADFD; 2637 break; 2638 } 2639 snd_pcm_stream_unlock_irq(substream); 2640 return err; 2641 } 2642 2643 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2644 snd_pcm_sframes_t __user *res) 2645 { 2646 struct snd_pcm_runtime *runtime = substream->runtime; 2647 int err; 2648 snd_pcm_sframes_t n = 0; 2649 2650 snd_pcm_stream_lock_irq(substream); 2651 switch (runtime->status->state) { 2652 case SNDRV_PCM_STATE_DRAINING: 2653 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2654 goto __badfd; 2655 /* Fall through */ 2656 case SNDRV_PCM_STATE_RUNNING: 2657 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2658 break; 2659 /* Fall through */ 2660 case SNDRV_PCM_STATE_PREPARED: 2661 case SNDRV_PCM_STATE_SUSPENDED: 2662 err = 0; 2663 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2664 n = snd_pcm_playback_hw_avail(runtime); 2665 else 2666 n = snd_pcm_capture_avail(runtime); 2667 n += runtime->delay; 2668 break; 2669 case SNDRV_PCM_STATE_XRUN: 2670 err = -EPIPE; 2671 break; 2672 default: 2673 __badfd: 2674 err = -EBADFD; 2675 break; 2676 } 2677 snd_pcm_stream_unlock_irq(substream); 2678 if (!err) 2679 if (put_user(n, res)) 2680 err = -EFAULT; 2681 return err; 2682 } 2683 2684 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2685 struct snd_pcm_sync_ptr __user *_sync_ptr) 2686 { 2687 struct snd_pcm_runtime *runtime = substream->runtime; 2688 struct snd_pcm_sync_ptr sync_ptr; 2689 volatile struct snd_pcm_mmap_status *status; 2690 volatile struct snd_pcm_mmap_control *control; 2691 int err; 2692 2693 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2694 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2695 return -EFAULT; 2696 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2697 return -EFAULT; 2698 status = runtime->status; 2699 control = runtime->control; 2700 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2701 err = snd_pcm_hwsync(substream); 2702 if (err < 0) 2703 return err; 2704 } 2705 snd_pcm_stream_lock_irq(substream); 2706 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 2707 control->appl_ptr = sync_ptr.c.control.appl_ptr; 2708 else 2709 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2710 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2711 control->avail_min = sync_ptr.c.control.avail_min; 2712 else 2713 sync_ptr.c.control.avail_min = control->avail_min; 2714 sync_ptr.s.status.state = status->state; 2715 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2716 sync_ptr.s.status.tstamp = status->tstamp; 2717 sync_ptr.s.status.suspended_state = status->suspended_state; 2718 snd_pcm_stream_unlock_irq(substream); 2719 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2720 return -EFAULT; 2721 return 0; 2722 } 2723 2724 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2725 { 2726 struct snd_pcm_runtime *runtime = substream->runtime; 2727 int arg; 2728 2729 if (get_user(arg, _arg)) 2730 return -EFAULT; 2731 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2732 return -EINVAL; 2733 runtime->tstamp_type = arg; 2734 return 0; 2735 } 2736 2737 static int snd_pcm_common_ioctl1(struct file *file, 2738 struct snd_pcm_substream *substream, 2739 unsigned int cmd, void __user *arg) 2740 { 2741 switch (cmd) { 2742 case SNDRV_PCM_IOCTL_PVERSION: 2743 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2744 case SNDRV_PCM_IOCTL_INFO: 2745 return snd_pcm_info_user(substream, arg); 2746 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2747 return 0; 2748 case SNDRV_PCM_IOCTL_TTSTAMP: 2749 return snd_pcm_tstamp(substream, arg); 2750 case SNDRV_PCM_IOCTL_HW_REFINE: 2751 return snd_pcm_hw_refine_user(substream, arg); 2752 case SNDRV_PCM_IOCTL_HW_PARAMS: 2753 return snd_pcm_hw_params_user(substream, arg); 2754 case SNDRV_PCM_IOCTL_HW_FREE: 2755 return snd_pcm_hw_free(substream); 2756 case SNDRV_PCM_IOCTL_SW_PARAMS: 2757 return snd_pcm_sw_params_user(substream, arg); 2758 case SNDRV_PCM_IOCTL_STATUS: 2759 return snd_pcm_status_user(substream, arg, false); 2760 case SNDRV_PCM_IOCTL_STATUS_EXT: 2761 return snd_pcm_status_user(substream, arg, true); 2762 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2763 return snd_pcm_channel_info_user(substream, arg); 2764 case SNDRV_PCM_IOCTL_PREPARE: 2765 return snd_pcm_prepare(substream, file); 2766 case SNDRV_PCM_IOCTL_RESET: 2767 return snd_pcm_reset(substream); 2768 case SNDRV_PCM_IOCTL_START: 2769 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); 2770 case SNDRV_PCM_IOCTL_LINK: 2771 return snd_pcm_link(substream, (int)(unsigned long) arg); 2772 case SNDRV_PCM_IOCTL_UNLINK: 2773 return snd_pcm_unlink(substream); 2774 case SNDRV_PCM_IOCTL_RESUME: 2775 return snd_pcm_resume(substream); 2776 case SNDRV_PCM_IOCTL_XRUN: 2777 return snd_pcm_xrun(substream); 2778 case SNDRV_PCM_IOCTL_HWSYNC: 2779 return snd_pcm_hwsync(substream); 2780 case SNDRV_PCM_IOCTL_DELAY: 2781 return snd_pcm_delay(substream, arg); 2782 case SNDRV_PCM_IOCTL_SYNC_PTR: 2783 return snd_pcm_sync_ptr(substream, arg); 2784 #ifdef CONFIG_SND_SUPPORT_OLD_API 2785 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2786 return snd_pcm_hw_refine_old_user(substream, arg); 2787 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2788 return snd_pcm_hw_params_old_user(substream, arg); 2789 #endif 2790 case SNDRV_PCM_IOCTL_DRAIN: 2791 return snd_pcm_drain(substream, file); 2792 case SNDRV_PCM_IOCTL_DROP: 2793 return snd_pcm_drop(substream); 2794 case SNDRV_PCM_IOCTL_PAUSE: 2795 { 2796 int res; 2797 snd_pcm_stream_lock_irq(substream); 2798 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2799 snd_pcm_stream_unlock_irq(substream); 2800 return res; 2801 } 2802 } 2803 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2804 return -ENOTTY; 2805 } 2806 2807 static int snd_pcm_playback_ioctl1(struct file *file, 2808 struct snd_pcm_substream *substream, 2809 unsigned int cmd, void __user *arg) 2810 { 2811 if (snd_BUG_ON(!substream)) 2812 return -ENXIO; 2813 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2814 return -EINVAL; 2815 switch (cmd) { 2816 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2817 { 2818 struct snd_xferi xferi; 2819 struct snd_xferi __user *_xferi = arg; 2820 struct snd_pcm_runtime *runtime = substream->runtime; 2821 snd_pcm_sframes_t result; 2822 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2823 return -EBADFD; 2824 if (put_user(0, &_xferi->result)) 2825 return -EFAULT; 2826 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2827 return -EFAULT; 2828 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2829 __put_user(result, &_xferi->result); 2830 return result < 0 ? result : 0; 2831 } 2832 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2833 { 2834 struct snd_xfern xfern; 2835 struct snd_xfern __user *_xfern = arg; 2836 struct snd_pcm_runtime *runtime = substream->runtime; 2837 void __user **bufs; 2838 snd_pcm_sframes_t result; 2839 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2840 return -EBADFD; 2841 if (runtime->channels > 128) 2842 return -EINVAL; 2843 if (put_user(0, &_xfern->result)) 2844 return -EFAULT; 2845 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2846 return -EFAULT; 2847 2848 bufs = memdup_user(xfern.bufs, 2849 sizeof(void *) * runtime->channels); 2850 if (IS_ERR(bufs)) 2851 return PTR_ERR(bufs); 2852 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2853 kfree(bufs); 2854 __put_user(result, &_xfern->result); 2855 return result < 0 ? result : 0; 2856 } 2857 case SNDRV_PCM_IOCTL_REWIND: 2858 { 2859 snd_pcm_uframes_t frames; 2860 snd_pcm_uframes_t __user *_frames = arg; 2861 snd_pcm_sframes_t result; 2862 if (get_user(frames, _frames)) 2863 return -EFAULT; 2864 if (put_user(0, _frames)) 2865 return -EFAULT; 2866 result = snd_pcm_playback_rewind(substream, frames); 2867 __put_user(result, _frames); 2868 return result < 0 ? result : 0; 2869 } 2870 case SNDRV_PCM_IOCTL_FORWARD: 2871 { 2872 snd_pcm_uframes_t frames; 2873 snd_pcm_uframes_t __user *_frames = arg; 2874 snd_pcm_sframes_t result; 2875 if (get_user(frames, _frames)) 2876 return -EFAULT; 2877 if (put_user(0, _frames)) 2878 return -EFAULT; 2879 result = snd_pcm_playback_forward(substream, frames); 2880 __put_user(result, _frames); 2881 return result < 0 ? result : 0; 2882 } 2883 } 2884 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2885 } 2886 2887 static int snd_pcm_capture_ioctl1(struct file *file, 2888 struct snd_pcm_substream *substream, 2889 unsigned int cmd, void __user *arg) 2890 { 2891 if (snd_BUG_ON(!substream)) 2892 return -ENXIO; 2893 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2894 return -EINVAL; 2895 switch (cmd) { 2896 case SNDRV_PCM_IOCTL_READI_FRAMES: 2897 { 2898 struct snd_xferi xferi; 2899 struct snd_xferi __user *_xferi = arg; 2900 struct snd_pcm_runtime *runtime = substream->runtime; 2901 snd_pcm_sframes_t result; 2902 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2903 return -EBADFD; 2904 if (put_user(0, &_xferi->result)) 2905 return -EFAULT; 2906 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2907 return -EFAULT; 2908 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2909 __put_user(result, &_xferi->result); 2910 return result < 0 ? result : 0; 2911 } 2912 case SNDRV_PCM_IOCTL_READN_FRAMES: 2913 { 2914 struct snd_xfern xfern; 2915 struct snd_xfern __user *_xfern = arg; 2916 struct snd_pcm_runtime *runtime = substream->runtime; 2917 void *bufs; 2918 snd_pcm_sframes_t result; 2919 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2920 return -EBADFD; 2921 if (runtime->channels > 128) 2922 return -EINVAL; 2923 if (put_user(0, &_xfern->result)) 2924 return -EFAULT; 2925 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2926 return -EFAULT; 2927 2928 bufs = memdup_user(xfern.bufs, 2929 sizeof(void *) * runtime->channels); 2930 if (IS_ERR(bufs)) 2931 return PTR_ERR(bufs); 2932 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2933 kfree(bufs); 2934 __put_user(result, &_xfern->result); 2935 return result < 0 ? result : 0; 2936 } 2937 case SNDRV_PCM_IOCTL_REWIND: 2938 { 2939 snd_pcm_uframes_t frames; 2940 snd_pcm_uframes_t __user *_frames = arg; 2941 snd_pcm_sframes_t result; 2942 if (get_user(frames, _frames)) 2943 return -EFAULT; 2944 if (put_user(0, _frames)) 2945 return -EFAULT; 2946 result = snd_pcm_capture_rewind(substream, frames); 2947 __put_user(result, _frames); 2948 return result < 0 ? result : 0; 2949 } 2950 case SNDRV_PCM_IOCTL_FORWARD: 2951 { 2952 snd_pcm_uframes_t frames; 2953 snd_pcm_uframes_t __user *_frames = arg; 2954 snd_pcm_sframes_t result; 2955 if (get_user(frames, _frames)) 2956 return -EFAULT; 2957 if (put_user(0, _frames)) 2958 return -EFAULT; 2959 result = snd_pcm_capture_forward(substream, frames); 2960 __put_user(result, _frames); 2961 return result < 0 ? result : 0; 2962 } 2963 } 2964 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2965 } 2966 2967 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2968 unsigned long arg) 2969 { 2970 struct snd_pcm_file *pcm_file; 2971 2972 pcm_file = file->private_data; 2973 2974 if (((cmd >> 8) & 0xff) != 'A') 2975 return -ENOTTY; 2976 2977 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2978 (void __user *)arg); 2979 } 2980 2981 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2982 unsigned long arg) 2983 { 2984 struct snd_pcm_file *pcm_file; 2985 2986 pcm_file = file->private_data; 2987 2988 if (((cmd >> 8) & 0xff) != 'A') 2989 return -ENOTTY; 2990 2991 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2992 (void __user *)arg); 2993 } 2994 2995 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2996 unsigned int cmd, void *arg) 2997 { 2998 mm_segment_t fs; 2999 int result; 3000 3001 fs = snd_enter_user(); 3002 switch (substream->stream) { 3003 case SNDRV_PCM_STREAM_PLAYBACK: 3004 result = snd_pcm_playback_ioctl1(NULL, substream, cmd, 3005 (void __user *)arg); 3006 break; 3007 case SNDRV_PCM_STREAM_CAPTURE: 3008 result = snd_pcm_capture_ioctl1(NULL, substream, cmd, 3009 (void __user *)arg); 3010 break; 3011 default: 3012 result = -EINVAL; 3013 break; 3014 } 3015 snd_leave_user(fs); 3016 return result; 3017 } 3018 3019 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3020 3021 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3022 loff_t * offset) 3023 { 3024 struct snd_pcm_file *pcm_file; 3025 struct snd_pcm_substream *substream; 3026 struct snd_pcm_runtime *runtime; 3027 snd_pcm_sframes_t result; 3028 3029 pcm_file = file->private_data; 3030 substream = pcm_file->substream; 3031 if (PCM_RUNTIME_CHECK(substream)) 3032 return -ENXIO; 3033 runtime = substream->runtime; 3034 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3035 return -EBADFD; 3036 if (!frame_aligned(runtime, count)) 3037 return -EINVAL; 3038 count = bytes_to_frames(runtime, count); 3039 result = snd_pcm_lib_read(substream, buf, count); 3040 if (result > 0) 3041 result = frames_to_bytes(runtime, result); 3042 return result; 3043 } 3044 3045 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3046 size_t count, loff_t * offset) 3047 { 3048 struct snd_pcm_file *pcm_file; 3049 struct snd_pcm_substream *substream; 3050 struct snd_pcm_runtime *runtime; 3051 snd_pcm_sframes_t result; 3052 3053 pcm_file = file->private_data; 3054 substream = pcm_file->substream; 3055 if (PCM_RUNTIME_CHECK(substream)) 3056 return -ENXIO; 3057 runtime = substream->runtime; 3058 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3059 return -EBADFD; 3060 if (!frame_aligned(runtime, count)) 3061 return -EINVAL; 3062 count = bytes_to_frames(runtime, count); 3063 result = snd_pcm_lib_write(substream, buf, count); 3064 if (result > 0) 3065 result = frames_to_bytes(runtime, result); 3066 return result; 3067 } 3068 3069 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3070 { 3071 struct snd_pcm_file *pcm_file; 3072 struct snd_pcm_substream *substream; 3073 struct snd_pcm_runtime *runtime; 3074 snd_pcm_sframes_t result; 3075 unsigned long i; 3076 void __user **bufs; 3077 snd_pcm_uframes_t frames; 3078 3079 pcm_file = iocb->ki_filp->private_data; 3080 substream = pcm_file->substream; 3081 if (PCM_RUNTIME_CHECK(substream)) 3082 return -ENXIO; 3083 runtime = substream->runtime; 3084 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3085 return -EBADFD; 3086 if (!iter_is_iovec(to)) 3087 return -EINVAL; 3088 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3089 return -EINVAL; 3090 if (!frame_aligned(runtime, to->iov->iov_len)) 3091 return -EINVAL; 3092 frames = bytes_to_samples(runtime, to->iov->iov_len); 3093 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); 3094 if (bufs == NULL) 3095 return -ENOMEM; 3096 for (i = 0; i < to->nr_segs; ++i) 3097 bufs[i] = to->iov[i].iov_base; 3098 result = snd_pcm_lib_readv(substream, bufs, frames); 3099 if (result > 0) 3100 result = frames_to_bytes(runtime, result); 3101 kfree(bufs); 3102 return result; 3103 } 3104 3105 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3106 { 3107 struct snd_pcm_file *pcm_file; 3108 struct snd_pcm_substream *substream; 3109 struct snd_pcm_runtime *runtime; 3110 snd_pcm_sframes_t result; 3111 unsigned long i; 3112 void __user **bufs; 3113 snd_pcm_uframes_t frames; 3114 3115 pcm_file = iocb->ki_filp->private_data; 3116 substream = pcm_file->substream; 3117 if (PCM_RUNTIME_CHECK(substream)) 3118 return -ENXIO; 3119 runtime = substream->runtime; 3120 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3121 return -EBADFD; 3122 if (!iter_is_iovec(from)) 3123 return -EINVAL; 3124 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3125 !frame_aligned(runtime, from->iov->iov_len)) 3126 return -EINVAL; 3127 frames = bytes_to_samples(runtime, from->iov->iov_len); 3128 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); 3129 if (bufs == NULL) 3130 return -ENOMEM; 3131 for (i = 0; i < from->nr_segs; ++i) 3132 bufs[i] = from->iov[i].iov_base; 3133 result = snd_pcm_lib_writev(substream, bufs, frames); 3134 if (result > 0) 3135 result = frames_to_bytes(runtime, result); 3136 kfree(bufs); 3137 return result; 3138 } 3139 3140 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3141 { 3142 struct snd_pcm_file *pcm_file; 3143 struct snd_pcm_substream *substream; 3144 struct snd_pcm_runtime *runtime; 3145 unsigned int mask; 3146 snd_pcm_uframes_t avail; 3147 3148 pcm_file = file->private_data; 3149 3150 substream = pcm_file->substream; 3151 if (PCM_RUNTIME_CHECK(substream)) 3152 return -ENXIO; 3153 runtime = substream->runtime; 3154 3155 poll_wait(file, &runtime->sleep, wait); 3156 3157 snd_pcm_stream_lock_irq(substream); 3158 avail = snd_pcm_playback_avail(runtime); 3159 switch (runtime->status->state) { 3160 case SNDRV_PCM_STATE_RUNNING: 3161 case SNDRV_PCM_STATE_PREPARED: 3162 case SNDRV_PCM_STATE_PAUSED: 3163 if (avail >= runtime->control->avail_min) { 3164 mask = POLLOUT | POLLWRNORM; 3165 break; 3166 } 3167 /* Fall through */ 3168 case SNDRV_PCM_STATE_DRAINING: 3169 mask = 0; 3170 break; 3171 default: 3172 mask = POLLOUT | POLLWRNORM | POLLERR; 3173 break; 3174 } 3175 snd_pcm_stream_unlock_irq(substream); 3176 return mask; 3177 } 3178 3179 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3180 { 3181 struct snd_pcm_file *pcm_file; 3182 struct snd_pcm_substream *substream; 3183 struct snd_pcm_runtime *runtime; 3184 unsigned int mask; 3185 snd_pcm_uframes_t avail; 3186 3187 pcm_file = file->private_data; 3188 3189 substream = pcm_file->substream; 3190 if (PCM_RUNTIME_CHECK(substream)) 3191 return -ENXIO; 3192 runtime = substream->runtime; 3193 3194 poll_wait(file, &runtime->sleep, wait); 3195 3196 snd_pcm_stream_lock_irq(substream); 3197 avail = snd_pcm_capture_avail(runtime); 3198 switch (runtime->status->state) { 3199 case SNDRV_PCM_STATE_RUNNING: 3200 case SNDRV_PCM_STATE_PREPARED: 3201 case SNDRV_PCM_STATE_PAUSED: 3202 if (avail >= runtime->control->avail_min) { 3203 mask = POLLIN | POLLRDNORM; 3204 break; 3205 } 3206 mask = 0; 3207 break; 3208 case SNDRV_PCM_STATE_DRAINING: 3209 if (avail > 0) { 3210 mask = POLLIN | POLLRDNORM; 3211 break; 3212 } 3213 /* Fall through */ 3214 default: 3215 mask = POLLIN | POLLRDNORM | POLLERR; 3216 break; 3217 } 3218 snd_pcm_stream_unlock_irq(substream); 3219 return mask; 3220 } 3221 3222 /* 3223 * mmap support 3224 */ 3225 3226 /* 3227 * Only on coherent architectures, we can mmap the status and the control records 3228 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3229 */ 3230 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3231 /* 3232 * mmap status record 3233 */ 3234 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area, 3235 struct vm_fault *vmf) 3236 { 3237 struct snd_pcm_substream *substream = area->vm_private_data; 3238 struct snd_pcm_runtime *runtime; 3239 3240 if (substream == NULL) 3241 return VM_FAULT_SIGBUS; 3242 runtime = substream->runtime; 3243 vmf->page = virt_to_page(runtime->status); 3244 get_page(vmf->page); 3245 return 0; 3246 } 3247 3248 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3249 { 3250 .fault = snd_pcm_mmap_status_fault, 3251 }; 3252 3253 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3254 struct vm_area_struct *area) 3255 { 3256 long size; 3257 if (!(area->vm_flags & VM_READ)) 3258 return -EINVAL; 3259 size = area->vm_end - area->vm_start; 3260 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3261 return -EINVAL; 3262 area->vm_ops = &snd_pcm_vm_ops_status; 3263 area->vm_private_data = substream; 3264 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3265 return 0; 3266 } 3267 3268 /* 3269 * mmap control record 3270 */ 3271 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area, 3272 struct vm_fault *vmf) 3273 { 3274 struct snd_pcm_substream *substream = area->vm_private_data; 3275 struct snd_pcm_runtime *runtime; 3276 3277 if (substream == NULL) 3278 return VM_FAULT_SIGBUS; 3279 runtime = substream->runtime; 3280 vmf->page = virt_to_page(runtime->control); 3281 get_page(vmf->page); 3282 return 0; 3283 } 3284 3285 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3286 { 3287 .fault = snd_pcm_mmap_control_fault, 3288 }; 3289 3290 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3291 struct vm_area_struct *area) 3292 { 3293 long size; 3294 if (!(area->vm_flags & VM_READ)) 3295 return -EINVAL; 3296 size = area->vm_end - area->vm_start; 3297 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3298 return -EINVAL; 3299 area->vm_ops = &snd_pcm_vm_ops_control; 3300 area->vm_private_data = substream; 3301 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3302 return 0; 3303 } 3304 #else /* ! coherent mmap */ 3305 /* 3306 * don't support mmap for status and control records. 3307 */ 3308 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3309 struct vm_area_struct *area) 3310 { 3311 return -ENXIO; 3312 } 3313 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3314 struct vm_area_struct *area) 3315 { 3316 return -ENXIO; 3317 } 3318 #endif /* coherent mmap */ 3319 3320 static inline struct page * 3321 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3322 { 3323 void *vaddr = substream->runtime->dma_area + ofs; 3324 return virt_to_page(vaddr); 3325 } 3326 3327 /* 3328 * fault callback for mmapping a RAM page 3329 */ 3330 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area, 3331 struct vm_fault *vmf) 3332 { 3333 struct snd_pcm_substream *substream = area->vm_private_data; 3334 struct snd_pcm_runtime *runtime; 3335 unsigned long offset; 3336 struct page * page; 3337 size_t dma_bytes; 3338 3339 if (substream == NULL) 3340 return VM_FAULT_SIGBUS; 3341 runtime = substream->runtime; 3342 offset = vmf->pgoff << PAGE_SHIFT; 3343 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3344 if (offset > dma_bytes - PAGE_SIZE) 3345 return VM_FAULT_SIGBUS; 3346 if (substream->ops->page) 3347 page = substream->ops->page(substream, offset); 3348 else 3349 page = snd_pcm_default_page_ops(substream, offset); 3350 if (!page) 3351 return VM_FAULT_SIGBUS; 3352 get_page(page); 3353 vmf->page = page; 3354 return 0; 3355 } 3356 3357 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3358 .open = snd_pcm_mmap_data_open, 3359 .close = snd_pcm_mmap_data_close, 3360 }; 3361 3362 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3363 .open = snd_pcm_mmap_data_open, 3364 .close = snd_pcm_mmap_data_close, 3365 .fault = snd_pcm_mmap_data_fault, 3366 }; 3367 3368 /* 3369 * mmap the DMA buffer on RAM 3370 */ 3371 3372 /** 3373 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3374 * @substream: PCM substream 3375 * @area: VMA 3376 * 3377 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3378 * this function is invoked implicitly. 3379 */ 3380 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3381 struct vm_area_struct *area) 3382 { 3383 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3384 #ifdef CONFIG_GENERIC_ALLOCATOR 3385 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3386 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3387 return remap_pfn_range(area, area->vm_start, 3388 substream->dma_buffer.addr >> PAGE_SHIFT, 3389 area->vm_end - area->vm_start, area->vm_page_prot); 3390 } 3391 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3392 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ 3393 if (!substream->ops->page && 3394 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3395 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3396 area, 3397 substream->runtime->dma_area, 3398 substream->runtime->dma_addr, 3399 area->vm_end - area->vm_start); 3400 #endif /* CONFIG_X86 */ 3401 /* mmap with fault handler */ 3402 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3403 return 0; 3404 } 3405 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3406 3407 /* 3408 * mmap the DMA buffer on I/O memory area 3409 */ 3410 #if SNDRV_PCM_INFO_MMAP_IOMEM 3411 /** 3412 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3413 * @substream: PCM substream 3414 * @area: VMA 3415 * 3416 * When your hardware uses the iomapped pages as the hardware buffer and 3417 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3418 * is supposed to work only on limited architectures. 3419 */ 3420 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3421 struct vm_area_struct *area) 3422 { 3423 struct snd_pcm_runtime *runtime = substream->runtime;; 3424 3425 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3426 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3427 } 3428 3429 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3430 #endif /* SNDRV_PCM_INFO_MMAP */ 3431 3432 /* 3433 * mmap DMA buffer 3434 */ 3435 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3436 struct vm_area_struct *area) 3437 { 3438 struct snd_pcm_runtime *runtime; 3439 long size; 3440 unsigned long offset; 3441 size_t dma_bytes; 3442 int err; 3443 3444 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3445 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3446 return -EINVAL; 3447 } else { 3448 if (!(area->vm_flags & VM_READ)) 3449 return -EINVAL; 3450 } 3451 runtime = substream->runtime; 3452 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3453 return -EBADFD; 3454 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3455 return -ENXIO; 3456 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3457 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3458 return -EINVAL; 3459 size = area->vm_end - area->vm_start; 3460 offset = area->vm_pgoff << PAGE_SHIFT; 3461 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3462 if ((size_t)size > dma_bytes) 3463 return -EINVAL; 3464 if (offset > dma_bytes - size) 3465 return -EINVAL; 3466 3467 area->vm_ops = &snd_pcm_vm_ops_data; 3468 area->vm_private_data = substream; 3469 if (substream->ops->mmap) 3470 err = substream->ops->mmap(substream, area); 3471 else 3472 err = snd_pcm_lib_default_mmap(substream, area); 3473 if (!err) 3474 atomic_inc(&substream->mmap_count); 3475 return err; 3476 } 3477 3478 EXPORT_SYMBOL(snd_pcm_mmap_data); 3479 3480 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3481 { 3482 struct snd_pcm_file * pcm_file; 3483 struct snd_pcm_substream *substream; 3484 unsigned long offset; 3485 3486 pcm_file = file->private_data; 3487 substream = pcm_file->substream; 3488 if (PCM_RUNTIME_CHECK(substream)) 3489 return -ENXIO; 3490 3491 offset = area->vm_pgoff << PAGE_SHIFT; 3492 switch (offset) { 3493 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3494 if (pcm_file->no_compat_mmap) 3495 return -ENXIO; 3496 return snd_pcm_mmap_status(substream, file, area); 3497 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3498 if (pcm_file->no_compat_mmap) 3499 return -ENXIO; 3500 return snd_pcm_mmap_control(substream, file, area); 3501 default: 3502 return snd_pcm_mmap_data(substream, file, area); 3503 } 3504 return 0; 3505 } 3506 3507 static int snd_pcm_fasync(int fd, struct file * file, int on) 3508 { 3509 struct snd_pcm_file * pcm_file; 3510 struct snd_pcm_substream *substream; 3511 struct snd_pcm_runtime *runtime; 3512 3513 pcm_file = file->private_data; 3514 substream = pcm_file->substream; 3515 if (PCM_RUNTIME_CHECK(substream)) 3516 return -ENXIO; 3517 runtime = substream->runtime; 3518 return fasync_helper(fd, file, on, &runtime->fasync); 3519 } 3520 3521 /* 3522 * ioctl32 compat 3523 */ 3524 #ifdef CONFIG_COMPAT 3525 #include "pcm_compat.c" 3526 #else 3527 #define snd_pcm_ioctl_compat NULL 3528 #endif 3529 3530 /* 3531 * To be removed helpers to keep binary compatibility 3532 */ 3533 3534 #ifdef CONFIG_SND_SUPPORT_OLD_API 3535 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3536 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3537 3538 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3539 struct snd_pcm_hw_params_old *oparams) 3540 { 3541 unsigned int i; 3542 3543 memset(params, 0, sizeof(*params)); 3544 params->flags = oparams->flags; 3545 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3546 params->masks[i].bits[0] = oparams->masks[i]; 3547 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3548 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3549 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3550 params->info = oparams->info; 3551 params->msbits = oparams->msbits; 3552 params->rate_num = oparams->rate_num; 3553 params->rate_den = oparams->rate_den; 3554 params->fifo_size = oparams->fifo_size; 3555 } 3556 3557 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3558 struct snd_pcm_hw_params *params) 3559 { 3560 unsigned int i; 3561 3562 memset(oparams, 0, sizeof(*oparams)); 3563 oparams->flags = params->flags; 3564 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3565 oparams->masks[i] = params->masks[i].bits[0]; 3566 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3567 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3568 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3569 oparams->info = params->info; 3570 oparams->msbits = params->msbits; 3571 oparams->rate_num = params->rate_num; 3572 oparams->rate_den = params->rate_den; 3573 oparams->fifo_size = params->fifo_size; 3574 } 3575 3576 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3577 struct snd_pcm_hw_params_old __user * _oparams) 3578 { 3579 struct snd_pcm_hw_params *params; 3580 struct snd_pcm_hw_params_old *oparams = NULL; 3581 int err; 3582 3583 params = kmalloc(sizeof(*params), GFP_KERNEL); 3584 if (!params) 3585 return -ENOMEM; 3586 3587 oparams = memdup_user(_oparams, sizeof(*oparams)); 3588 if (IS_ERR(oparams)) { 3589 err = PTR_ERR(oparams); 3590 goto out; 3591 } 3592 snd_pcm_hw_convert_from_old_params(params, oparams); 3593 err = snd_pcm_hw_refine(substream, params); 3594 snd_pcm_hw_convert_to_old_params(oparams, params); 3595 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3596 if (!err) 3597 err = -EFAULT; 3598 } 3599 3600 kfree(oparams); 3601 out: 3602 kfree(params); 3603 return err; 3604 } 3605 3606 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3607 struct snd_pcm_hw_params_old __user * _oparams) 3608 { 3609 struct snd_pcm_hw_params *params; 3610 struct snd_pcm_hw_params_old *oparams = NULL; 3611 int err; 3612 3613 params = kmalloc(sizeof(*params), GFP_KERNEL); 3614 if (!params) 3615 return -ENOMEM; 3616 3617 oparams = memdup_user(_oparams, sizeof(*oparams)); 3618 if (IS_ERR(oparams)) { 3619 err = PTR_ERR(oparams); 3620 goto out; 3621 } 3622 snd_pcm_hw_convert_from_old_params(params, oparams); 3623 err = snd_pcm_hw_params(substream, params); 3624 snd_pcm_hw_convert_to_old_params(oparams, params); 3625 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3626 if (!err) 3627 err = -EFAULT; 3628 } 3629 3630 kfree(oparams); 3631 out: 3632 kfree(params); 3633 return err; 3634 } 3635 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3636 3637 #ifndef CONFIG_MMU 3638 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3639 unsigned long addr, 3640 unsigned long len, 3641 unsigned long pgoff, 3642 unsigned long flags) 3643 { 3644 struct snd_pcm_file *pcm_file = file->private_data; 3645 struct snd_pcm_substream *substream = pcm_file->substream; 3646 struct snd_pcm_runtime *runtime = substream->runtime; 3647 unsigned long offset = pgoff << PAGE_SHIFT; 3648 3649 switch (offset) { 3650 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3651 return (unsigned long)runtime->status; 3652 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3653 return (unsigned long)runtime->control; 3654 default: 3655 return (unsigned long)runtime->dma_area + offset; 3656 } 3657 } 3658 #else 3659 # define snd_pcm_get_unmapped_area NULL 3660 #endif 3661 3662 /* 3663 * Register section 3664 */ 3665 3666 const struct file_operations snd_pcm_f_ops[2] = { 3667 { 3668 .owner = THIS_MODULE, 3669 .write = snd_pcm_write, 3670 .write_iter = snd_pcm_writev, 3671 .open = snd_pcm_playback_open, 3672 .release = snd_pcm_release, 3673 .llseek = no_llseek, 3674 .poll = snd_pcm_playback_poll, 3675 .unlocked_ioctl = snd_pcm_playback_ioctl, 3676 .compat_ioctl = snd_pcm_ioctl_compat, 3677 .mmap = snd_pcm_mmap, 3678 .fasync = snd_pcm_fasync, 3679 .get_unmapped_area = snd_pcm_get_unmapped_area, 3680 }, 3681 { 3682 .owner = THIS_MODULE, 3683 .read = snd_pcm_read, 3684 .read_iter = snd_pcm_readv, 3685 .open = snd_pcm_capture_open, 3686 .release = snd_pcm_release, 3687 .llseek = no_llseek, 3688 .poll = snd_pcm_capture_poll, 3689 .unlocked_ioctl = snd_pcm_capture_ioctl, 3690 .compat_ioctl = snd_pcm_ioctl_compat, 3691 .mmap = snd_pcm_mmap, 3692 .fasync = snd_pcm_fasync, 3693 .get_unmapped_area = snd_pcm_get_unmapped_area, 3694 } 3695 }; 3696