1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/file.h> 25 #include <linux/slab.h> 26 #include <linux/time.h> 27 #include <linux/pm_qos.h> 28 #include <linux/aio.h> 29 #include <linux/dma-mapping.h> 30 #include <sound/core.h> 31 #include <sound/control.h> 32 #include <sound/info.h> 33 #include <sound/pcm.h> 34 #include <sound/pcm_params.h> 35 #include <sound/timer.h> 36 #include <sound/minors.h> 37 #include <asm/io.h> 38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 39 #include <dma-coherence.h> 40 #endif 41 42 /* 43 * Compatibility 44 */ 45 46 struct snd_pcm_hw_params_old { 47 unsigned int flags; 48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 49 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 52 unsigned int rmask; 53 unsigned int cmask; 54 unsigned int info; 55 unsigned int msbits; 56 unsigned int rate_num; 57 unsigned int rate_den; 58 snd_pcm_uframes_t fifo_size; 59 unsigned char reserved[64]; 60 }; 61 62 #ifdef CONFIG_SND_SUPPORT_OLD_API 63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 65 66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 67 struct snd_pcm_hw_params_old __user * _oparams); 68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 69 struct snd_pcm_hw_params_old __user * _oparams); 70 #endif 71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 72 73 /* 74 * 75 */ 76 77 static DEFINE_RWLOCK(snd_pcm_link_rwlock); 78 static DECLARE_RWSEM(snd_pcm_link_rwsem); 79 80 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 81 { 82 if (substream->pcm->nonatomic) { 83 down_read(&snd_pcm_link_rwsem); 84 mutex_lock(&substream->self_group.mutex); 85 } else { 86 read_lock(&snd_pcm_link_rwlock); 87 spin_lock(&substream->self_group.lock); 88 } 89 } 90 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 91 92 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 93 { 94 if (substream->pcm->nonatomic) { 95 mutex_unlock(&substream->self_group.mutex); 96 up_read(&snd_pcm_link_rwsem); 97 } else { 98 spin_unlock(&substream->self_group.lock); 99 read_unlock(&snd_pcm_link_rwlock); 100 } 101 } 102 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 103 104 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 105 { 106 if (!substream->pcm->nonatomic) 107 local_irq_disable(); 108 snd_pcm_stream_lock(substream); 109 } 110 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 111 112 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 113 { 114 snd_pcm_stream_unlock(substream); 115 if (!substream->pcm->nonatomic) 116 local_irq_enable(); 117 } 118 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 119 120 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 121 { 122 unsigned long flags = 0; 123 if (!substream->pcm->nonatomic) 124 local_irq_save(flags); 125 snd_pcm_stream_lock(substream); 126 return flags; 127 } 128 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 129 130 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 131 unsigned long flags) 132 { 133 snd_pcm_stream_unlock(substream); 134 if (!substream->pcm->nonatomic) 135 local_irq_restore(flags); 136 } 137 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 138 139 static inline mm_segment_t snd_enter_user(void) 140 { 141 mm_segment_t fs = get_fs(); 142 set_fs(get_ds()); 143 return fs; 144 } 145 146 static inline void snd_leave_user(mm_segment_t fs) 147 { 148 set_fs(fs); 149 } 150 151 152 153 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 154 { 155 struct snd_pcm_runtime *runtime; 156 struct snd_pcm *pcm = substream->pcm; 157 struct snd_pcm_str *pstr = substream->pstr; 158 159 memset(info, 0, sizeof(*info)); 160 info->card = pcm->card->number; 161 info->device = pcm->device; 162 info->stream = substream->stream; 163 info->subdevice = substream->number; 164 strlcpy(info->id, pcm->id, sizeof(info->id)); 165 strlcpy(info->name, pcm->name, sizeof(info->name)); 166 info->dev_class = pcm->dev_class; 167 info->dev_subclass = pcm->dev_subclass; 168 info->subdevices_count = pstr->substream_count; 169 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 170 strlcpy(info->subname, substream->name, sizeof(info->subname)); 171 runtime = substream->runtime; 172 /* AB: FIXME!!! This is definitely nonsense */ 173 if (runtime) { 174 info->sync = runtime->sync; 175 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info); 176 } 177 return 0; 178 } 179 180 int snd_pcm_info_user(struct snd_pcm_substream *substream, 181 struct snd_pcm_info __user * _info) 182 { 183 struct snd_pcm_info *info; 184 int err; 185 186 info = kmalloc(sizeof(*info), GFP_KERNEL); 187 if (! info) 188 return -ENOMEM; 189 err = snd_pcm_info(substream, info); 190 if (err >= 0) { 191 if (copy_to_user(_info, info, sizeof(*info))) 192 err = -EFAULT; 193 } 194 kfree(info); 195 return err; 196 } 197 198 #undef RULES_DEBUG 199 200 #ifdef RULES_DEBUG 201 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v 202 static const char * const snd_pcm_hw_param_names[] = { 203 HW_PARAM(ACCESS), 204 HW_PARAM(FORMAT), 205 HW_PARAM(SUBFORMAT), 206 HW_PARAM(SAMPLE_BITS), 207 HW_PARAM(FRAME_BITS), 208 HW_PARAM(CHANNELS), 209 HW_PARAM(RATE), 210 HW_PARAM(PERIOD_TIME), 211 HW_PARAM(PERIOD_SIZE), 212 HW_PARAM(PERIOD_BYTES), 213 HW_PARAM(PERIODS), 214 HW_PARAM(BUFFER_TIME), 215 HW_PARAM(BUFFER_SIZE), 216 HW_PARAM(BUFFER_BYTES), 217 HW_PARAM(TICK_TIME), 218 }; 219 #endif 220 221 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 222 struct snd_pcm_hw_params *params) 223 { 224 unsigned int k; 225 struct snd_pcm_hardware *hw; 226 struct snd_interval *i = NULL; 227 struct snd_mask *m = NULL; 228 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints; 229 unsigned int rstamps[constrs->rules_num]; 230 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 231 unsigned int stamp = 2; 232 int changed, again; 233 234 params->info = 0; 235 params->fifo_size = 0; 236 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 237 params->msbits = 0; 238 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 239 params->rate_num = 0; 240 params->rate_den = 0; 241 } 242 243 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 244 m = hw_param_mask(params, k); 245 if (snd_mask_empty(m)) 246 return -EINVAL; 247 if (!(params->rmask & (1 << k))) 248 continue; 249 #ifdef RULES_DEBUG 250 pr_debug("%s = ", snd_pcm_hw_param_names[k]); 251 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 252 #endif 253 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 254 #ifdef RULES_DEBUG 255 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 256 #endif 257 if (changed) 258 params->cmask |= 1 << k; 259 if (changed < 0) 260 return changed; 261 } 262 263 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 264 i = hw_param_interval(params, k); 265 if (snd_interval_empty(i)) 266 return -EINVAL; 267 if (!(params->rmask & (1 << k))) 268 continue; 269 #ifdef RULES_DEBUG 270 pr_debug("%s = ", snd_pcm_hw_param_names[k]); 271 if (i->empty) 272 pr_cont("empty"); 273 else 274 pr_cont("%c%u %u%c", 275 i->openmin ? '(' : '[', i->min, 276 i->max, i->openmax ? ')' : ']'); 277 pr_cont(" -> "); 278 #endif 279 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 280 #ifdef RULES_DEBUG 281 if (i->empty) 282 pr_cont("empty\n"); 283 else 284 pr_cont("%c%u %u%c\n", 285 i->openmin ? '(' : '[', i->min, 286 i->max, i->openmax ? ')' : ']'); 287 #endif 288 if (changed) 289 params->cmask |= 1 << k; 290 if (changed < 0) 291 return changed; 292 } 293 294 for (k = 0; k < constrs->rules_num; k++) 295 rstamps[k] = 0; 296 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 297 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 298 do { 299 again = 0; 300 for (k = 0; k < constrs->rules_num; k++) { 301 struct snd_pcm_hw_rule *r = &constrs->rules[k]; 302 unsigned int d; 303 int doit = 0; 304 if (r->cond && !(r->cond & params->flags)) 305 continue; 306 for (d = 0; r->deps[d] >= 0; d++) { 307 if (vstamps[r->deps[d]] > rstamps[k]) { 308 doit = 1; 309 break; 310 } 311 } 312 if (!doit) 313 continue; 314 #ifdef RULES_DEBUG 315 pr_debug("Rule %d [%p]: ", k, r->func); 316 if (r->var >= 0) { 317 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]); 318 if (hw_is_mask(r->var)) { 319 m = hw_param_mask(params, r->var); 320 pr_cont("%x", *m->bits); 321 } else { 322 i = hw_param_interval(params, r->var); 323 if (i->empty) 324 pr_cont("empty"); 325 else 326 pr_cont("%c%u %u%c", 327 i->openmin ? '(' : '[', i->min, 328 i->max, i->openmax ? ')' : ']'); 329 } 330 } 331 #endif 332 changed = r->func(params, r); 333 #ifdef RULES_DEBUG 334 if (r->var >= 0) { 335 pr_cont(" -> "); 336 if (hw_is_mask(r->var)) 337 pr_cont("%x", *m->bits); 338 else { 339 if (i->empty) 340 pr_cont("empty"); 341 else 342 pr_cont("%c%u %u%c", 343 i->openmin ? '(' : '[', i->min, 344 i->max, i->openmax ? ')' : ']'); 345 } 346 } 347 pr_cont("\n"); 348 #endif 349 rstamps[k] = stamp; 350 if (changed && r->var >= 0) { 351 params->cmask |= (1 << r->var); 352 vstamps[r->var] = stamp; 353 again = 1; 354 } 355 if (changed < 0) 356 return changed; 357 stamp++; 358 } 359 } while (again); 360 if (!params->msbits) { 361 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 362 if (snd_interval_single(i)) 363 params->msbits = snd_interval_value(i); 364 } 365 366 if (!params->rate_den) { 367 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 368 if (snd_interval_single(i)) { 369 params->rate_num = snd_interval_value(i); 370 params->rate_den = 1; 371 } 372 } 373 374 hw = &substream->runtime->hw; 375 if (!params->info) 376 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES; 377 if (!params->fifo_size) { 378 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 379 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 380 if (snd_mask_min(m) == snd_mask_max(m) && 381 snd_interval_min(i) == snd_interval_max(i)) { 382 changed = substream->ops->ioctl(substream, 383 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 384 if (changed < 0) 385 return changed; 386 } 387 } 388 params->rmask = 0; 389 return 0; 390 } 391 392 EXPORT_SYMBOL(snd_pcm_hw_refine); 393 394 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 395 struct snd_pcm_hw_params __user * _params) 396 { 397 struct snd_pcm_hw_params *params; 398 int err; 399 400 params = memdup_user(_params, sizeof(*params)); 401 if (IS_ERR(params)) 402 return PTR_ERR(params); 403 404 err = snd_pcm_hw_refine(substream, params); 405 if (copy_to_user(_params, params, sizeof(*params))) { 406 if (!err) 407 err = -EFAULT; 408 } 409 410 kfree(params); 411 return err; 412 } 413 414 static int period_to_usecs(struct snd_pcm_runtime *runtime) 415 { 416 int usecs; 417 418 if (! runtime->rate) 419 return -1; /* invalid */ 420 421 /* take 75% of period time as the deadline */ 422 usecs = (750000 / runtime->rate) * runtime->period_size; 423 usecs += ((750000 % runtime->rate) * runtime->period_size) / 424 runtime->rate; 425 426 return usecs; 427 } 428 429 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 430 { 431 snd_pcm_stream_lock_irq(substream); 432 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 433 substream->runtime->status->state = state; 434 snd_pcm_stream_unlock_irq(substream); 435 } 436 437 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 438 struct snd_pcm_hw_params *params) 439 { 440 struct snd_pcm_runtime *runtime; 441 int err, usecs; 442 unsigned int bits; 443 snd_pcm_uframes_t frames; 444 445 if (PCM_RUNTIME_CHECK(substream)) 446 return -ENXIO; 447 runtime = substream->runtime; 448 snd_pcm_stream_lock_irq(substream); 449 switch (runtime->status->state) { 450 case SNDRV_PCM_STATE_OPEN: 451 case SNDRV_PCM_STATE_SETUP: 452 case SNDRV_PCM_STATE_PREPARED: 453 break; 454 default: 455 snd_pcm_stream_unlock_irq(substream); 456 return -EBADFD; 457 } 458 snd_pcm_stream_unlock_irq(substream); 459 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 460 if (!substream->oss.oss) 461 #endif 462 if (atomic_read(&substream->mmap_count)) 463 return -EBADFD; 464 465 params->rmask = ~0U; 466 err = snd_pcm_hw_refine(substream, params); 467 if (err < 0) 468 goto _error; 469 470 err = snd_pcm_hw_params_choose(substream, params); 471 if (err < 0) 472 goto _error; 473 474 if (substream->ops->hw_params != NULL) { 475 err = substream->ops->hw_params(substream, params); 476 if (err < 0) 477 goto _error; 478 } 479 480 runtime->access = params_access(params); 481 runtime->format = params_format(params); 482 runtime->subformat = params_subformat(params); 483 runtime->channels = params_channels(params); 484 runtime->rate = params_rate(params); 485 runtime->period_size = params_period_size(params); 486 runtime->periods = params_periods(params); 487 runtime->buffer_size = params_buffer_size(params); 488 runtime->info = params->info; 489 runtime->rate_num = params->rate_num; 490 runtime->rate_den = params->rate_den; 491 runtime->no_period_wakeup = 492 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 493 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 494 495 bits = snd_pcm_format_physical_width(runtime->format); 496 runtime->sample_bits = bits; 497 bits *= runtime->channels; 498 runtime->frame_bits = bits; 499 frames = 1; 500 while (bits % 8 != 0) { 501 bits *= 2; 502 frames *= 2; 503 } 504 runtime->byte_align = bits / 8; 505 runtime->min_align = frames; 506 507 /* Default sw params */ 508 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 509 runtime->period_step = 1; 510 runtime->control->avail_min = runtime->period_size; 511 runtime->start_threshold = 1; 512 runtime->stop_threshold = runtime->buffer_size; 513 runtime->silence_threshold = 0; 514 runtime->silence_size = 0; 515 runtime->boundary = runtime->buffer_size; 516 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 517 runtime->boundary *= 2; 518 519 snd_pcm_timer_resolution_change(substream); 520 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 521 522 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 523 pm_qos_remove_request(&substream->latency_pm_qos_req); 524 if ((usecs = period_to_usecs(runtime)) >= 0) 525 pm_qos_add_request(&substream->latency_pm_qos_req, 526 PM_QOS_CPU_DMA_LATENCY, usecs); 527 return 0; 528 _error: 529 /* hardware might be unusable from this time, 530 so we force application to retry to set 531 the correct hardware parameter settings */ 532 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 533 if (substream->ops->hw_free != NULL) 534 substream->ops->hw_free(substream); 535 return err; 536 } 537 538 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 539 struct snd_pcm_hw_params __user * _params) 540 { 541 struct snd_pcm_hw_params *params; 542 int err; 543 544 params = memdup_user(_params, sizeof(*params)); 545 if (IS_ERR(params)) 546 return PTR_ERR(params); 547 548 err = snd_pcm_hw_params(substream, params); 549 if (copy_to_user(_params, params, sizeof(*params))) { 550 if (!err) 551 err = -EFAULT; 552 } 553 554 kfree(params); 555 return err; 556 } 557 558 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 559 { 560 struct snd_pcm_runtime *runtime; 561 int result = 0; 562 563 if (PCM_RUNTIME_CHECK(substream)) 564 return -ENXIO; 565 runtime = substream->runtime; 566 snd_pcm_stream_lock_irq(substream); 567 switch (runtime->status->state) { 568 case SNDRV_PCM_STATE_SETUP: 569 case SNDRV_PCM_STATE_PREPARED: 570 break; 571 default: 572 snd_pcm_stream_unlock_irq(substream); 573 return -EBADFD; 574 } 575 snd_pcm_stream_unlock_irq(substream); 576 if (atomic_read(&substream->mmap_count)) 577 return -EBADFD; 578 if (substream->ops->hw_free) 579 result = substream->ops->hw_free(substream); 580 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 581 pm_qos_remove_request(&substream->latency_pm_qos_req); 582 return result; 583 } 584 585 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 586 struct snd_pcm_sw_params *params) 587 { 588 struct snd_pcm_runtime *runtime; 589 int err; 590 591 if (PCM_RUNTIME_CHECK(substream)) 592 return -ENXIO; 593 runtime = substream->runtime; 594 snd_pcm_stream_lock_irq(substream); 595 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 596 snd_pcm_stream_unlock_irq(substream); 597 return -EBADFD; 598 } 599 snd_pcm_stream_unlock_irq(substream); 600 601 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 602 return -EINVAL; 603 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 604 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 605 return -EINVAL; 606 if (params->avail_min == 0) 607 return -EINVAL; 608 if (params->silence_size >= runtime->boundary) { 609 if (params->silence_threshold != 0) 610 return -EINVAL; 611 } else { 612 if (params->silence_size > params->silence_threshold) 613 return -EINVAL; 614 if (params->silence_threshold > runtime->buffer_size) 615 return -EINVAL; 616 } 617 err = 0; 618 snd_pcm_stream_lock_irq(substream); 619 runtime->tstamp_mode = params->tstamp_mode; 620 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 621 runtime->tstamp_type = params->tstamp_type; 622 runtime->period_step = params->period_step; 623 runtime->control->avail_min = params->avail_min; 624 runtime->start_threshold = params->start_threshold; 625 runtime->stop_threshold = params->stop_threshold; 626 runtime->silence_threshold = params->silence_threshold; 627 runtime->silence_size = params->silence_size; 628 params->boundary = runtime->boundary; 629 if (snd_pcm_running(substream)) { 630 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 631 runtime->silence_size > 0) 632 snd_pcm_playback_silence(substream, ULONG_MAX); 633 err = snd_pcm_update_state(substream, runtime); 634 } 635 snd_pcm_stream_unlock_irq(substream); 636 return err; 637 } 638 639 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 640 struct snd_pcm_sw_params __user * _params) 641 { 642 struct snd_pcm_sw_params params; 643 int err; 644 if (copy_from_user(¶ms, _params, sizeof(params))) 645 return -EFAULT; 646 err = snd_pcm_sw_params(substream, ¶ms); 647 if (copy_to_user(_params, ¶ms, sizeof(params))) 648 return -EFAULT; 649 return err; 650 } 651 652 int snd_pcm_status(struct snd_pcm_substream *substream, 653 struct snd_pcm_status *status) 654 { 655 struct snd_pcm_runtime *runtime = substream->runtime; 656 657 snd_pcm_stream_lock_irq(substream); 658 status->state = runtime->status->state; 659 status->suspended_state = runtime->status->suspended_state; 660 if (status->state == SNDRV_PCM_STATE_OPEN) 661 goto _end; 662 status->trigger_tstamp = runtime->trigger_tstamp; 663 if (snd_pcm_running(substream)) { 664 snd_pcm_update_hw_ptr(substream); 665 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 666 status->tstamp = runtime->status->tstamp; 667 status->audio_tstamp = 668 runtime->status->audio_tstamp; 669 goto _tstamp_end; 670 } 671 } 672 snd_pcm_gettime(runtime, &status->tstamp); 673 _tstamp_end: 674 status->appl_ptr = runtime->control->appl_ptr; 675 status->hw_ptr = runtime->status->hw_ptr; 676 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 677 status->avail = snd_pcm_playback_avail(runtime); 678 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 679 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 680 status->delay = runtime->buffer_size - status->avail; 681 status->delay += runtime->delay; 682 } else 683 status->delay = 0; 684 } else { 685 status->avail = snd_pcm_capture_avail(runtime); 686 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 687 status->delay = status->avail + runtime->delay; 688 else 689 status->delay = 0; 690 } 691 status->avail_max = runtime->avail_max; 692 status->overrange = runtime->overrange; 693 runtime->avail_max = 0; 694 runtime->overrange = 0; 695 _end: 696 snd_pcm_stream_unlock_irq(substream); 697 return 0; 698 } 699 700 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 701 struct snd_pcm_status __user * _status) 702 { 703 struct snd_pcm_status status; 704 int res; 705 706 memset(&status, 0, sizeof(status)); 707 res = snd_pcm_status(substream, &status); 708 if (res < 0) 709 return res; 710 if (copy_to_user(_status, &status, sizeof(status))) 711 return -EFAULT; 712 return 0; 713 } 714 715 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 716 struct snd_pcm_channel_info * info) 717 { 718 struct snd_pcm_runtime *runtime; 719 unsigned int channel; 720 721 channel = info->channel; 722 runtime = substream->runtime; 723 snd_pcm_stream_lock_irq(substream); 724 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 725 snd_pcm_stream_unlock_irq(substream); 726 return -EBADFD; 727 } 728 snd_pcm_stream_unlock_irq(substream); 729 if (channel >= runtime->channels) 730 return -EINVAL; 731 memset(info, 0, sizeof(*info)); 732 info->channel = channel; 733 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 734 } 735 736 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 737 struct snd_pcm_channel_info __user * _info) 738 { 739 struct snd_pcm_channel_info info; 740 int res; 741 742 if (copy_from_user(&info, _info, sizeof(info))) 743 return -EFAULT; 744 res = snd_pcm_channel_info(substream, &info); 745 if (res < 0) 746 return res; 747 if (copy_to_user(_info, &info, sizeof(info))) 748 return -EFAULT; 749 return 0; 750 } 751 752 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 753 { 754 struct snd_pcm_runtime *runtime = substream->runtime; 755 if (runtime->trigger_master == NULL) 756 return; 757 if (runtime->trigger_master == substream) { 758 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 759 } else { 760 snd_pcm_trigger_tstamp(runtime->trigger_master); 761 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 762 } 763 runtime->trigger_master = NULL; 764 } 765 766 struct action_ops { 767 int (*pre_action)(struct snd_pcm_substream *substream, int state); 768 int (*do_action)(struct snd_pcm_substream *substream, int state); 769 void (*undo_action)(struct snd_pcm_substream *substream, int state); 770 void (*post_action)(struct snd_pcm_substream *substream, int state); 771 }; 772 773 /* 774 * this functions is core for handling of linked stream 775 * Note: the stream state might be changed also on failure 776 * Note2: call with calling stream lock + link lock 777 */ 778 static int snd_pcm_action_group(struct action_ops *ops, 779 struct snd_pcm_substream *substream, 780 int state, int do_lock) 781 { 782 struct snd_pcm_substream *s = NULL; 783 struct snd_pcm_substream *s1; 784 int res = 0; 785 786 snd_pcm_group_for_each_entry(s, substream) { 787 if (do_lock && s != substream) { 788 if (s->pcm->nonatomic) 789 mutex_lock_nested(&s->self_group.mutex, 790 SINGLE_DEPTH_NESTING); 791 else 792 spin_lock_nested(&s->self_group.lock, 793 SINGLE_DEPTH_NESTING); 794 } 795 res = ops->pre_action(s, state); 796 if (res < 0) 797 goto _unlock; 798 } 799 snd_pcm_group_for_each_entry(s, substream) { 800 res = ops->do_action(s, state); 801 if (res < 0) { 802 if (ops->undo_action) { 803 snd_pcm_group_for_each_entry(s1, substream) { 804 if (s1 == s) /* failed stream */ 805 break; 806 ops->undo_action(s1, state); 807 } 808 } 809 s = NULL; /* unlock all */ 810 goto _unlock; 811 } 812 } 813 snd_pcm_group_for_each_entry(s, substream) { 814 ops->post_action(s, state); 815 } 816 _unlock: 817 if (do_lock) { 818 /* unlock streams */ 819 snd_pcm_group_for_each_entry(s1, substream) { 820 if (s1 != substream) { 821 if (s1->pcm->nonatomic) 822 mutex_unlock(&s1->self_group.mutex); 823 else 824 spin_unlock(&s1->self_group.lock); 825 } 826 if (s1 == s) /* end */ 827 break; 828 } 829 } 830 return res; 831 } 832 833 /* 834 * Note: call with stream lock 835 */ 836 static int snd_pcm_action_single(struct action_ops *ops, 837 struct snd_pcm_substream *substream, 838 int state) 839 { 840 int res; 841 842 res = ops->pre_action(substream, state); 843 if (res < 0) 844 return res; 845 res = ops->do_action(substream, state); 846 if (res == 0) 847 ops->post_action(substream, state); 848 else if (ops->undo_action) 849 ops->undo_action(substream, state); 850 return res; 851 } 852 853 /* call in mutex-protected context */ 854 static int snd_pcm_action_mutex(struct action_ops *ops, 855 struct snd_pcm_substream *substream, 856 int state) 857 { 858 int res; 859 860 if (snd_pcm_stream_linked(substream)) { 861 if (!mutex_trylock(&substream->group->mutex)) { 862 mutex_unlock(&substream->self_group.mutex); 863 mutex_lock(&substream->group->mutex); 864 mutex_lock(&substream->self_group.mutex); 865 } 866 res = snd_pcm_action_group(ops, substream, state, 1); 867 mutex_unlock(&substream->group->mutex); 868 } else { 869 res = snd_pcm_action_single(ops, substream, state); 870 } 871 return res; 872 } 873 874 /* 875 * Note: call with stream lock 876 */ 877 static int snd_pcm_action(struct action_ops *ops, 878 struct snd_pcm_substream *substream, 879 int state) 880 { 881 int res; 882 883 if (substream->pcm->nonatomic) 884 return snd_pcm_action_mutex(ops, substream, state); 885 886 if (snd_pcm_stream_linked(substream)) { 887 if (!spin_trylock(&substream->group->lock)) { 888 spin_unlock(&substream->self_group.lock); 889 spin_lock(&substream->group->lock); 890 spin_lock(&substream->self_group.lock); 891 } 892 res = snd_pcm_action_group(ops, substream, state, 1); 893 spin_unlock(&substream->group->lock); 894 } else { 895 res = snd_pcm_action_single(ops, substream, state); 896 } 897 return res; 898 } 899 900 static int snd_pcm_action_lock_mutex(struct action_ops *ops, 901 struct snd_pcm_substream *substream, 902 int state) 903 { 904 int res; 905 906 down_read(&snd_pcm_link_rwsem); 907 if (snd_pcm_stream_linked(substream)) { 908 mutex_lock(&substream->group->mutex); 909 mutex_lock_nested(&substream->self_group.mutex, 910 SINGLE_DEPTH_NESTING); 911 res = snd_pcm_action_group(ops, substream, state, 1); 912 mutex_unlock(&substream->self_group.mutex); 913 mutex_unlock(&substream->group->mutex); 914 } else { 915 mutex_lock(&substream->self_group.mutex); 916 res = snd_pcm_action_single(ops, substream, state); 917 mutex_unlock(&substream->self_group.mutex); 918 } 919 up_read(&snd_pcm_link_rwsem); 920 return res; 921 } 922 923 /* 924 * Note: don't use any locks before 925 */ 926 static int snd_pcm_action_lock_irq(struct action_ops *ops, 927 struct snd_pcm_substream *substream, 928 int state) 929 { 930 int res; 931 932 if (substream->pcm->nonatomic) 933 return snd_pcm_action_lock_mutex(ops, substream, state); 934 935 read_lock_irq(&snd_pcm_link_rwlock); 936 if (snd_pcm_stream_linked(substream)) { 937 spin_lock(&substream->group->lock); 938 spin_lock(&substream->self_group.lock); 939 res = snd_pcm_action_group(ops, substream, state, 1); 940 spin_unlock(&substream->self_group.lock); 941 spin_unlock(&substream->group->lock); 942 } else { 943 spin_lock(&substream->self_group.lock); 944 res = snd_pcm_action_single(ops, substream, state); 945 spin_unlock(&substream->self_group.lock); 946 } 947 read_unlock_irq(&snd_pcm_link_rwlock); 948 return res; 949 } 950 951 /* 952 */ 953 static int snd_pcm_action_nonatomic(struct action_ops *ops, 954 struct snd_pcm_substream *substream, 955 int state) 956 { 957 int res; 958 959 down_read(&snd_pcm_link_rwsem); 960 if (snd_pcm_stream_linked(substream)) 961 res = snd_pcm_action_group(ops, substream, state, 0); 962 else 963 res = snd_pcm_action_single(ops, substream, state); 964 up_read(&snd_pcm_link_rwsem); 965 return res; 966 } 967 968 /* 969 * start callbacks 970 */ 971 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 972 { 973 struct snd_pcm_runtime *runtime = substream->runtime; 974 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 975 return -EBADFD; 976 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 977 !snd_pcm_playback_data(substream)) 978 return -EPIPE; 979 runtime->trigger_master = substream; 980 return 0; 981 } 982 983 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 984 { 985 if (substream->runtime->trigger_master != substream) 986 return 0; 987 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 988 } 989 990 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 991 { 992 if (substream->runtime->trigger_master == substream) 993 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 994 } 995 996 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 997 { 998 struct snd_pcm_runtime *runtime = substream->runtime; 999 snd_pcm_trigger_tstamp(substream); 1000 runtime->hw_ptr_jiffies = jiffies; 1001 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1002 runtime->rate; 1003 runtime->status->state = state; 1004 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1005 runtime->silence_size > 0) 1006 snd_pcm_playback_silence(substream, ULONG_MAX); 1007 if (substream->timer) 1008 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART, 1009 &runtime->trigger_tstamp); 1010 } 1011 1012 static struct action_ops snd_pcm_action_start = { 1013 .pre_action = snd_pcm_pre_start, 1014 .do_action = snd_pcm_do_start, 1015 .undo_action = snd_pcm_undo_start, 1016 .post_action = snd_pcm_post_start 1017 }; 1018 1019 /** 1020 * snd_pcm_start - start all linked streams 1021 * @substream: the PCM substream instance 1022 * 1023 * Return: Zero if successful, or a negative error code. 1024 */ 1025 int snd_pcm_start(struct snd_pcm_substream *substream) 1026 { 1027 return snd_pcm_action(&snd_pcm_action_start, substream, 1028 SNDRV_PCM_STATE_RUNNING); 1029 } 1030 1031 /* 1032 * stop callbacks 1033 */ 1034 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1035 { 1036 struct snd_pcm_runtime *runtime = substream->runtime; 1037 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1038 return -EBADFD; 1039 runtime->trigger_master = substream; 1040 return 0; 1041 } 1042 1043 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1044 { 1045 if (substream->runtime->trigger_master == substream && 1046 snd_pcm_running(substream)) 1047 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1048 return 0; /* unconditonally stop all substreams */ 1049 } 1050 1051 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1052 { 1053 struct snd_pcm_runtime *runtime = substream->runtime; 1054 if (runtime->status->state != state) { 1055 snd_pcm_trigger_tstamp(substream); 1056 if (substream->timer) 1057 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP, 1058 &runtime->trigger_tstamp); 1059 runtime->status->state = state; 1060 } 1061 wake_up(&runtime->sleep); 1062 wake_up(&runtime->tsleep); 1063 } 1064 1065 static struct action_ops snd_pcm_action_stop = { 1066 .pre_action = snd_pcm_pre_stop, 1067 .do_action = snd_pcm_do_stop, 1068 .post_action = snd_pcm_post_stop 1069 }; 1070 1071 /** 1072 * snd_pcm_stop - try to stop all running streams in the substream group 1073 * @substream: the PCM substream instance 1074 * @state: PCM state after stopping the stream 1075 * 1076 * The state of each stream is then changed to the given state unconditionally. 1077 * 1078 * Return: Zero if successful, or a negative error code. 1079 */ 1080 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1081 { 1082 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1083 } 1084 1085 EXPORT_SYMBOL(snd_pcm_stop); 1086 1087 /** 1088 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1089 * @substream: the PCM substream 1090 * 1091 * After stopping, the state is changed to SETUP. 1092 * Unlike snd_pcm_stop(), this affects only the given stream. 1093 * 1094 * Return: Zero if succesful, or a negative error code. 1095 */ 1096 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1097 { 1098 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1099 SNDRV_PCM_STATE_SETUP); 1100 } 1101 1102 /* 1103 * pause callbacks 1104 */ 1105 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1106 { 1107 struct snd_pcm_runtime *runtime = substream->runtime; 1108 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1109 return -ENOSYS; 1110 if (push) { 1111 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1112 return -EBADFD; 1113 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1114 return -EBADFD; 1115 runtime->trigger_master = substream; 1116 return 0; 1117 } 1118 1119 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1120 { 1121 if (substream->runtime->trigger_master != substream) 1122 return 0; 1123 /* some drivers might use hw_ptr to recover from the pause - 1124 update the hw_ptr now */ 1125 if (push) 1126 snd_pcm_update_hw_ptr(substream); 1127 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1128 * a delta between the current jiffies, this gives a large enough 1129 * delta, effectively to skip the check once. 1130 */ 1131 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1132 return substream->ops->trigger(substream, 1133 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1134 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1135 } 1136 1137 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1138 { 1139 if (substream->runtime->trigger_master == substream) 1140 substream->ops->trigger(substream, 1141 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1142 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1143 } 1144 1145 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1146 { 1147 struct snd_pcm_runtime *runtime = substream->runtime; 1148 snd_pcm_trigger_tstamp(substream); 1149 if (push) { 1150 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1151 if (substream->timer) 1152 snd_timer_notify(substream->timer, 1153 SNDRV_TIMER_EVENT_MPAUSE, 1154 &runtime->trigger_tstamp); 1155 wake_up(&runtime->sleep); 1156 wake_up(&runtime->tsleep); 1157 } else { 1158 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1159 if (substream->timer) 1160 snd_timer_notify(substream->timer, 1161 SNDRV_TIMER_EVENT_MCONTINUE, 1162 &runtime->trigger_tstamp); 1163 } 1164 } 1165 1166 static struct action_ops snd_pcm_action_pause = { 1167 .pre_action = snd_pcm_pre_pause, 1168 .do_action = snd_pcm_do_pause, 1169 .undo_action = snd_pcm_undo_pause, 1170 .post_action = snd_pcm_post_pause 1171 }; 1172 1173 /* 1174 * Push/release the pause for all linked streams. 1175 */ 1176 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1177 { 1178 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1179 } 1180 1181 #ifdef CONFIG_PM 1182 /* suspend */ 1183 1184 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1185 { 1186 struct snd_pcm_runtime *runtime = substream->runtime; 1187 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1188 return -EBUSY; 1189 runtime->trigger_master = substream; 1190 return 0; 1191 } 1192 1193 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1194 { 1195 struct snd_pcm_runtime *runtime = substream->runtime; 1196 if (runtime->trigger_master != substream) 1197 return 0; 1198 if (! snd_pcm_running(substream)) 1199 return 0; 1200 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1201 return 0; /* suspend unconditionally */ 1202 } 1203 1204 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1205 { 1206 struct snd_pcm_runtime *runtime = substream->runtime; 1207 snd_pcm_trigger_tstamp(substream); 1208 if (substream->timer) 1209 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND, 1210 &runtime->trigger_tstamp); 1211 runtime->status->suspended_state = runtime->status->state; 1212 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1213 wake_up(&runtime->sleep); 1214 wake_up(&runtime->tsleep); 1215 } 1216 1217 static struct action_ops snd_pcm_action_suspend = { 1218 .pre_action = snd_pcm_pre_suspend, 1219 .do_action = snd_pcm_do_suspend, 1220 .post_action = snd_pcm_post_suspend 1221 }; 1222 1223 /** 1224 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1225 * @substream: the PCM substream 1226 * 1227 * After this call, all streams are changed to SUSPENDED state. 1228 * 1229 * Return: Zero if successful (or @substream is %NULL), or a negative error 1230 * code. 1231 */ 1232 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1233 { 1234 int err; 1235 unsigned long flags; 1236 1237 if (! substream) 1238 return 0; 1239 1240 snd_pcm_stream_lock_irqsave(substream, flags); 1241 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1242 snd_pcm_stream_unlock_irqrestore(substream, flags); 1243 return err; 1244 } 1245 1246 EXPORT_SYMBOL(snd_pcm_suspend); 1247 1248 /** 1249 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1250 * @pcm: the PCM instance 1251 * 1252 * After this call, all streams are changed to SUSPENDED state. 1253 * 1254 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1255 */ 1256 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1257 { 1258 struct snd_pcm_substream *substream; 1259 int stream, err = 0; 1260 1261 if (! pcm) 1262 return 0; 1263 1264 for (stream = 0; stream < 2; stream++) { 1265 for (substream = pcm->streams[stream].substream; 1266 substream; substream = substream->next) { 1267 /* FIXME: the open/close code should lock this as well */ 1268 if (substream->runtime == NULL) 1269 continue; 1270 err = snd_pcm_suspend(substream); 1271 if (err < 0 && err != -EBUSY) 1272 return err; 1273 } 1274 } 1275 return 0; 1276 } 1277 1278 EXPORT_SYMBOL(snd_pcm_suspend_all); 1279 1280 /* resume */ 1281 1282 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1283 { 1284 struct snd_pcm_runtime *runtime = substream->runtime; 1285 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1286 return -ENOSYS; 1287 runtime->trigger_master = substream; 1288 return 0; 1289 } 1290 1291 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1292 { 1293 struct snd_pcm_runtime *runtime = substream->runtime; 1294 if (runtime->trigger_master != substream) 1295 return 0; 1296 /* DMA not running previously? */ 1297 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1298 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1299 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1300 return 0; 1301 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1302 } 1303 1304 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1305 { 1306 if (substream->runtime->trigger_master == substream && 1307 snd_pcm_running(substream)) 1308 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1309 } 1310 1311 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1312 { 1313 struct snd_pcm_runtime *runtime = substream->runtime; 1314 snd_pcm_trigger_tstamp(substream); 1315 if (substream->timer) 1316 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME, 1317 &runtime->trigger_tstamp); 1318 runtime->status->state = runtime->status->suspended_state; 1319 } 1320 1321 static struct action_ops snd_pcm_action_resume = { 1322 .pre_action = snd_pcm_pre_resume, 1323 .do_action = snd_pcm_do_resume, 1324 .undo_action = snd_pcm_undo_resume, 1325 .post_action = snd_pcm_post_resume 1326 }; 1327 1328 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1329 { 1330 struct snd_card *card = substream->pcm->card; 1331 int res; 1332 1333 snd_power_lock(card); 1334 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1335 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1336 snd_power_unlock(card); 1337 return res; 1338 } 1339 1340 #else 1341 1342 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1343 { 1344 return -ENOSYS; 1345 } 1346 1347 #endif /* CONFIG_PM */ 1348 1349 /* 1350 * xrun ioctl 1351 * 1352 * Change the RUNNING stream(s) to XRUN state. 1353 */ 1354 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1355 { 1356 struct snd_card *card = substream->pcm->card; 1357 struct snd_pcm_runtime *runtime = substream->runtime; 1358 int result; 1359 1360 snd_power_lock(card); 1361 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1362 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1363 if (result < 0) 1364 goto _unlock; 1365 } 1366 1367 snd_pcm_stream_lock_irq(substream); 1368 switch (runtime->status->state) { 1369 case SNDRV_PCM_STATE_XRUN: 1370 result = 0; /* already there */ 1371 break; 1372 case SNDRV_PCM_STATE_RUNNING: 1373 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1374 break; 1375 default: 1376 result = -EBADFD; 1377 } 1378 snd_pcm_stream_unlock_irq(substream); 1379 _unlock: 1380 snd_power_unlock(card); 1381 return result; 1382 } 1383 1384 /* 1385 * reset ioctl 1386 */ 1387 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1388 { 1389 struct snd_pcm_runtime *runtime = substream->runtime; 1390 switch (runtime->status->state) { 1391 case SNDRV_PCM_STATE_RUNNING: 1392 case SNDRV_PCM_STATE_PREPARED: 1393 case SNDRV_PCM_STATE_PAUSED: 1394 case SNDRV_PCM_STATE_SUSPENDED: 1395 return 0; 1396 default: 1397 return -EBADFD; 1398 } 1399 } 1400 1401 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1402 { 1403 struct snd_pcm_runtime *runtime = substream->runtime; 1404 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1405 if (err < 0) 1406 return err; 1407 runtime->hw_ptr_base = 0; 1408 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1409 runtime->status->hw_ptr % runtime->period_size; 1410 runtime->silence_start = runtime->status->hw_ptr; 1411 runtime->silence_filled = 0; 1412 return 0; 1413 } 1414 1415 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1416 { 1417 struct snd_pcm_runtime *runtime = substream->runtime; 1418 runtime->control->appl_ptr = runtime->status->hw_ptr; 1419 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1420 runtime->silence_size > 0) 1421 snd_pcm_playback_silence(substream, ULONG_MAX); 1422 } 1423 1424 static struct action_ops snd_pcm_action_reset = { 1425 .pre_action = snd_pcm_pre_reset, 1426 .do_action = snd_pcm_do_reset, 1427 .post_action = snd_pcm_post_reset 1428 }; 1429 1430 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1431 { 1432 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1433 } 1434 1435 /* 1436 * prepare ioctl 1437 */ 1438 /* we use the second argument for updating f_flags */ 1439 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1440 int f_flags) 1441 { 1442 struct snd_pcm_runtime *runtime = substream->runtime; 1443 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1444 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1445 return -EBADFD; 1446 if (snd_pcm_running(substream)) 1447 return -EBUSY; 1448 substream->f_flags = f_flags; 1449 return 0; 1450 } 1451 1452 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1453 { 1454 int err; 1455 err = substream->ops->prepare(substream); 1456 if (err < 0) 1457 return err; 1458 return snd_pcm_do_reset(substream, 0); 1459 } 1460 1461 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1462 { 1463 struct snd_pcm_runtime *runtime = substream->runtime; 1464 runtime->control->appl_ptr = runtime->status->hw_ptr; 1465 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1466 } 1467 1468 static struct action_ops snd_pcm_action_prepare = { 1469 .pre_action = snd_pcm_pre_prepare, 1470 .do_action = snd_pcm_do_prepare, 1471 .post_action = snd_pcm_post_prepare 1472 }; 1473 1474 /** 1475 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1476 * @substream: the PCM substream instance 1477 * @file: file to refer f_flags 1478 * 1479 * Return: Zero if successful, or a negative error code. 1480 */ 1481 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1482 struct file *file) 1483 { 1484 int res; 1485 struct snd_card *card = substream->pcm->card; 1486 int f_flags; 1487 1488 if (file) 1489 f_flags = file->f_flags; 1490 else 1491 f_flags = substream->f_flags; 1492 1493 snd_power_lock(card); 1494 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1495 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1496 substream, f_flags); 1497 snd_power_unlock(card); 1498 return res; 1499 } 1500 1501 /* 1502 * drain ioctl 1503 */ 1504 1505 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1506 { 1507 struct snd_pcm_runtime *runtime = substream->runtime; 1508 switch (runtime->status->state) { 1509 case SNDRV_PCM_STATE_OPEN: 1510 case SNDRV_PCM_STATE_DISCONNECTED: 1511 case SNDRV_PCM_STATE_SUSPENDED: 1512 return -EBADFD; 1513 } 1514 runtime->trigger_master = substream; 1515 return 0; 1516 } 1517 1518 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1519 { 1520 struct snd_pcm_runtime *runtime = substream->runtime; 1521 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1522 switch (runtime->status->state) { 1523 case SNDRV_PCM_STATE_PREPARED: 1524 /* start playback stream if possible */ 1525 if (! snd_pcm_playback_empty(substream)) { 1526 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1527 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1528 } 1529 break; 1530 case SNDRV_PCM_STATE_RUNNING: 1531 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1532 break; 1533 case SNDRV_PCM_STATE_XRUN: 1534 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1535 break; 1536 default: 1537 break; 1538 } 1539 } else { 1540 /* stop running stream */ 1541 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1542 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1543 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1544 snd_pcm_do_stop(substream, new_state); 1545 snd_pcm_post_stop(substream, new_state); 1546 } 1547 } 1548 return 0; 1549 } 1550 1551 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1552 { 1553 } 1554 1555 static struct action_ops snd_pcm_action_drain_init = { 1556 .pre_action = snd_pcm_pre_drain_init, 1557 .do_action = snd_pcm_do_drain_init, 1558 .post_action = snd_pcm_post_drain_init 1559 }; 1560 1561 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1562 1563 /* 1564 * Drain the stream(s). 1565 * When the substream is linked, sync until the draining of all playback streams 1566 * is finished. 1567 * After this call, all streams are supposed to be either SETUP or DRAINING 1568 * (capture only) state. 1569 */ 1570 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1571 struct file *file) 1572 { 1573 struct snd_card *card; 1574 struct snd_pcm_runtime *runtime; 1575 struct snd_pcm_substream *s; 1576 wait_queue_t wait; 1577 int result = 0; 1578 int nonblock = 0; 1579 1580 card = substream->pcm->card; 1581 runtime = substream->runtime; 1582 1583 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1584 return -EBADFD; 1585 1586 snd_power_lock(card); 1587 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1588 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1589 if (result < 0) { 1590 snd_power_unlock(card); 1591 return result; 1592 } 1593 } 1594 1595 if (file) { 1596 if (file->f_flags & O_NONBLOCK) 1597 nonblock = 1; 1598 } else if (substream->f_flags & O_NONBLOCK) 1599 nonblock = 1; 1600 1601 down_read(&snd_pcm_link_rwsem); 1602 snd_pcm_stream_lock_irq(substream); 1603 /* resume pause */ 1604 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1605 snd_pcm_pause(substream, 0); 1606 1607 /* pre-start/stop - all running streams are changed to DRAINING state */ 1608 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1609 if (result < 0) 1610 goto unlock; 1611 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1612 if (nonblock) { 1613 result = -EAGAIN; 1614 goto unlock; 1615 } 1616 1617 for (;;) { 1618 long tout; 1619 struct snd_pcm_runtime *to_check; 1620 if (signal_pending(current)) { 1621 result = -ERESTARTSYS; 1622 break; 1623 } 1624 /* find a substream to drain */ 1625 to_check = NULL; 1626 snd_pcm_group_for_each_entry(s, substream) { 1627 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1628 continue; 1629 runtime = s->runtime; 1630 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1631 to_check = runtime; 1632 break; 1633 } 1634 } 1635 if (!to_check) 1636 break; /* all drained */ 1637 init_waitqueue_entry(&wait, current); 1638 add_wait_queue(&to_check->sleep, &wait); 1639 snd_pcm_stream_unlock_irq(substream); 1640 up_read(&snd_pcm_link_rwsem); 1641 snd_power_unlock(card); 1642 if (runtime->no_period_wakeup) 1643 tout = MAX_SCHEDULE_TIMEOUT; 1644 else { 1645 tout = 10; 1646 if (runtime->rate) { 1647 long t = runtime->period_size * 2 / runtime->rate; 1648 tout = max(t, tout); 1649 } 1650 tout = msecs_to_jiffies(tout * 1000); 1651 } 1652 tout = schedule_timeout_interruptible(tout); 1653 snd_power_lock(card); 1654 down_read(&snd_pcm_link_rwsem); 1655 snd_pcm_stream_lock_irq(substream); 1656 remove_wait_queue(&to_check->sleep, &wait); 1657 if (card->shutdown) { 1658 result = -ENODEV; 1659 break; 1660 } 1661 if (tout == 0) { 1662 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1663 result = -ESTRPIPE; 1664 else { 1665 dev_dbg(substream->pcm->card->dev, 1666 "playback drain error (DMA or IRQ trouble?)\n"); 1667 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1668 result = -EIO; 1669 } 1670 break; 1671 } 1672 } 1673 1674 unlock: 1675 snd_pcm_stream_unlock_irq(substream); 1676 up_read(&snd_pcm_link_rwsem); 1677 snd_power_unlock(card); 1678 1679 return result; 1680 } 1681 1682 /* 1683 * drop ioctl 1684 * 1685 * Immediately put all linked substreams into SETUP state. 1686 */ 1687 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1688 { 1689 struct snd_pcm_runtime *runtime; 1690 int result = 0; 1691 1692 if (PCM_RUNTIME_CHECK(substream)) 1693 return -ENXIO; 1694 runtime = substream->runtime; 1695 1696 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1697 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1698 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1699 return -EBADFD; 1700 1701 snd_pcm_stream_lock_irq(substream); 1702 /* resume pause */ 1703 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1704 snd_pcm_pause(substream, 0); 1705 1706 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1707 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1708 snd_pcm_stream_unlock_irq(substream); 1709 1710 return result; 1711 } 1712 1713 1714 static bool is_pcm_file(struct file *file) 1715 { 1716 struct inode *inode = file_inode(file); 1717 unsigned int minor; 1718 1719 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1720 return false; 1721 minor = iminor(inode); 1722 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1723 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1724 } 1725 1726 /* 1727 * PCM link handling 1728 */ 1729 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1730 { 1731 int res = 0; 1732 struct snd_pcm_file *pcm_file; 1733 struct snd_pcm_substream *substream1; 1734 struct snd_pcm_group *group; 1735 struct fd f = fdget(fd); 1736 1737 if (!f.file) 1738 return -EBADFD; 1739 if (!is_pcm_file(f.file)) { 1740 res = -EBADFD; 1741 goto _badf; 1742 } 1743 pcm_file = f.file->private_data; 1744 substream1 = pcm_file->substream; 1745 group = kmalloc(sizeof(*group), GFP_KERNEL); 1746 if (!group) { 1747 res = -ENOMEM; 1748 goto _nolock; 1749 } 1750 down_write(&snd_pcm_link_rwsem); 1751 write_lock_irq(&snd_pcm_link_rwlock); 1752 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1753 substream->runtime->status->state != substream1->runtime->status->state || 1754 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1755 res = -EBADFD; 1756 goto _end; 1757 } 1758 if (snd_pcm_stream_linked(substream1)) { 1759 res = -EALREADY; 1760 goto _end; 1761 } 1762 if (!snd_pcm_stream_linked(substream)) { 1763 substream->group = group; 1764 group = NULL; 1765 spin_lock_init(&substream->group->lock); 1766 mutex_init(&substream->group->mutex); 1767 INIT_LIST_HEAD(&substream->group->substreams); 1768 list_add_tail(&substream->link_list, &substream->group->substreams); 1769 substream->group->count = 1; 1770 } 1771 list_add_tail(&substream1->link_list, &substream->group->substreams); 1772 substream->group->count++; 1773 substream1->group = substream->group; 1774 _end: 1775 write_unlock_irq(&snd_pcm_link_rwlock); 1776 up_write(&snd_pcm_link_rwsem); 1777 _nolock: 1778 snd_card_unref(substream1->pcm->card); 1779 kfree(group); 1780 _badf: 1781 fdput(f); 1782 return res; 1783 } 1784 1785 static void relink_to_local(struct snd_pcm_substream *substream) 1786 { 1787 substream->group = &substream->self_group; 1788 INIT_LIST_HEAD(&substream->self_group.substreams); 1789 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1790 } 1791 1792 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1793 { 1794 struct snd_pcm_substream *s; 1795 int res = 0; 1796 1797 down_write(&snd_pcm_link_rwsem); 1798 write_lock_irq(&snd_pcm_link_rwlock); 1799 if (!snd_pcm_stream_linked(substream)) { 1800 res = -EALREADY; 1801 goto _end; 1802 } 1803 list_del(&substream->link_list); 1804 substream->group->count--; 1805 if (substream->group->count == 1) { /* detach the last stream, too */ 1806 snd_pcm_group_for_each_entry(s, substream) { 1807 relink_to_local(s); 1808 break; 1809 } 1810 kfree(substream->group); 1811 } 1812 relink_to_local(substream); 1813 _end: 1814 write_unlock_irq(&snd_pcm_link_rwlock); 1815 up_write(&snd_pcm_link_rwsem); 1816 return res; 1817 } 1818 1819 /* 1820 * hw configurator 1821 */ 1822 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1823 struct snd_pcm_hw_rule *rule) 1824 { 1825 struct snd_interval t; 1826 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1827 hw_param_interval_c(params, rule->deps[1]), &t); 1828 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1829 } 1830 1831 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1832 struct snd_pcm_hw_rule *rule) 1833 { 1834 struct snd_interval t; 1835 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1836 hw_param_interval_c(params, rule->deps[1]), &t); 1837 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1838 } 1839 1840 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1841 struct snd_pcm_hw_rule *rule) 1842 { 1843 struct snd_interval t; 1844 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1845 hw_param_interval_c(params, rule->deps[1]), 1846 (unsigned long) rule->private, &t); 1847 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1848 } 1849 1850 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1851 struct snd_pcm_hw_rule *rule) 1852 { 1853 struct snd_interval t; 1854 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1855 (unsigned long) rule->private, 1856 hw_param_interval_c(params, rule->deps[1]), &t); 1857 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1858 } 1859 1860 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1861 struct snd_pcm_hw_rule *rule) 1862 { 1863 unsigned int k; 1864 struct snd_interval *i = hw_param_interval(params, rule->deps[0]); 1865 struct snd_mask m; 1866 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1867 snd_mask_any(&m); 1868 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1869 int bits; 1870 if (! snd_mask_test(mask, k)) 1871 continue; 1872 bits = snd_pcm_format_physical_width(k); 1873 if (bits <= 0) 1874 continue; /* ignore invalid formats */ 1875 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1876 snd_mask_reset(&m, k); 1877 } 1878 return snd_mask_refine(mask, &m); 1879 } 1880 1881 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1882 struct snd_pcm_hw_rule *rule) 1883 { 1884 struct snd_interval t; 1885 unsigned int k; 1886 t.min = UINT_MAX; 1887 t.max = 0; 1888 t.openmin = 0; 1889 t.openmax = 0; 1890 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1891 int bits; 1892 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1893 continue; 1894 bits = snd_pcm_format_physical_width(k); 1895 if (bits <= 0) 1896 continue; /* ignore invalid formats */ 1897 if (t.min > (unsigned)bits) 1898 t.min = bits; 1899 if (t.max < (unsigned)bits) 1900 t.max = bits; 1901 } 1902 t.integer = 1; 1903 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1904 } 1905 1906 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1907 #error "Change this table" 1908 #endif 1909 1910 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1911 48000, 64000, 88200, 96000, 176400, 192000 }; 1912 1913 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1914 .count = ARRAY_SIZE(rates), 1915 .list = rates, 1916 }; 1917 1918 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1919 struct snd_pcm_hw_rule *rule) 1920 { 1921 struct snd_pcm_hardware *hw = rule->private; 1922 return snd_interval_list(hw_param_interval(params, rule->var), 1923 snd_pcm_known_rates.count, 1924 snd_pcm_known_rates.list, hw->rates); 1925 } 1926 1927 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1928 struct snd_pcm_hw_rule *rule) 1929 { 1930 struct snd_interval t; 1931 struct snd_pcm_substream *substream = rule->private; 1932 t.min = 0; 1933 t.max = substream->buffer_bytes_max; 1934 t.openmin = 0; 1935 t.openmax = 0; 1936 t.integer = 1; 1937 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1938 } 1939 1940 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 1941 { 1942 struct snd_pcm_runtime *runtime = substream->runtime; 1943 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1944 int k, err; 1945 1946 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 1947 snd_mask_any(constrs_mask(constrs, k)); 1948 } 1949 1950 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 1951 snd_interval_any(constrs_interval(constrs, k)); 1952 } 1953 1954 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 1955 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 1956 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 1957 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 1958 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 1959 1960 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1961 snd_pcm_hw_rule_format, NULL, 1962 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1963 if (err < 0) 1964 return err; 1965 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1966 snd_pcm_hw_rule_sample_bits, NULL, 1967 SNDRV_PCM_HW_PARAM_FORMAT, 1968 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1969 if (err < 0) 1970 return err; 1971 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1972 snd_pcm_hw_rule_div, NULL, 1973 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1974 if (err < 0) 1975 return err; 1976 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1977 snd_pcm_hw_rule_mul, NULL, 1978 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1979 if (err < 0) 1980 return err; 1981 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1982 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1983 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1984 if (err < 0) 1985 return err; 1986 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1987 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1988 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 1989 if (err < 0) 1990 return err; 1991 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1992 snd_pcm_hw_rule_div, NULL, 1993 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1994 if (err < 0) 1995 return err; 1996 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1997 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1998 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 1999 if (err < 0) 2000 return err; 2001 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2002 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2003 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2004 if (err < 0) 2005 return err; 2006 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2007 snd_pcm_hw_rule_div, NULL, 2008 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2009 if (err < 0) 2010 return err; 2011 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2012 snd_pcm_hw_rule_div, NULL, 2013 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2014 if (err < 0) 2015 return err; 2016 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2017 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2018 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2019 if (err < 0) 2020 return err; 2021 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2022 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2023 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2024 if (err < 0) 2025 return err; 2026 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2027 snd_pcm_hw_rule_mul, NULL, 2028 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2029 if (err < 0) 2030 return err; 2031 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2032 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2033 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2034 if (err < 0) 2035 return err; 2036 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2037 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2038 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2039 if (err < 0) 2040 return err; 2041 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2042 snd_pcm_hw_rule_muldivk, (void*) 8, 2043 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2044 if (err < 0) 2045 return err; 2046 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2047 snd_pcm_hw_rule_muldivk, (void*) 8, 2048 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2049 if (err < 0) 2050 return err; 2051 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2052 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2053 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2054 if (err < 0) 2055 return err; 2056 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2057 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2058 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2059 if (err < 0) 2060 return err; 2061 return 0; 2062 } 2063 2064 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2065 { 2066 struct snd_pcm_runtime *runtime = substream->runtime; 2067 struct snd_pcm_hardware *hw = &runtime->hw; 2068 int err; 2069 unsigned int mask = 0; 2070 2071 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2072 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2073 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2074 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2075 if (hw->info & SNDRV_PCM_INFO_MMAP) { 2076 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2077 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2078 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2079 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2080 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2081 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2082 } 2083 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2084 if (err < 0) 2085 return err; 2086 2087 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2088 if (err < 0) 2089 return err; 2090 2091 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2092 if (err < 0) 2093 return err; 2094 2095 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2096 hw->channels_min, hw->channels_max); 2097 if (err < 0) 2098 return err; 2099 2100 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2101 hw->rate_min, hw->rate_max); 2102 if (err < 0) 2103 return err; 2104 2105 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2106 hw->period_bytes_min, hw->period_bytes_max); 2107 if (err < 0) 2108 return err; 2109 2110 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2111 hw->periods_min, hw->periods_max); 2112 if (err < 0) 2113 return err; 2114 2115 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2116 hw->period_bytes_min, hw->buffer_bytes_max); 2117 if (err < 0) 2118 return err; 2119 2120 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2121 snd_pcm_hw_rule_buffer_bytes_max, substream, 2122 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2123 if (err < 0) 2124 return err; 2125 2126 /* FIXME: remove */ 2127 if (runtime->dma_bytes) { 2128 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2129 if (err < 0) 2130 return err; 2131 } 2132 2133 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2134 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2135 snd_pcm_hw_rule_rate, hw, 2136 SNDRV_PCM_HW_PARAM_RATE, -1); 2137 if (err < 0) 2138 return err; 2139 } 2140 2141 /* FIXME: this belong to lowlevel */ 2142 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2143 2144 return 0; 2145 } 2146 2147 static void pcm_release_private(struct snd_pcm_substream *substream) 2148 { 2149 snd_pcm_unlink(substream); 2150 } 2151 2152 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2153 { 2154 substream->ref_count--; 2155 if (substream->ref_count > 0) 2156 return; 2157 2158 snd_pcm_drop(substream); 2159 if (substream->hw_opened) { 2160 if (substream->ops->hw_free != NULL) 2161 substream->ops->hw_free(substream); 2162 substream->ops->close(substream); 2163 substream->hw_opened = 0; 2164 } 2165 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2166 pm_qos_remove_request(&substream->latency_pm_qos_req); 2167 if (substream->pcm_release) { 2168 substream->pcm_release(substream); 2169 substream->pcm_release = NULL; 2170 } 2171 snd_pcm_detach_substream(substream); 2172 } 2173 2174 EXPORT_SYMBOL(snd_pcm_release_substream); 2175 2176 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2177 struct file *file, 2178 struct snd_pcm_substream **rsubstream) 2179 { 2180 struct snd_pcm_substream *substream; 2181 int err; 2182 2183 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2184 if (err < 0) 2185 return err; 2186 if (substream->ref_count > 1) { 2187 *rsubstream = substream; 2188 return 0; 2189 } 2190 2191 err = snd_pcm_hw_constraints_init(substream); 2192 if (err < 0) { 2193 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2194 goto error; 2195 } 2196 2197 if ((err = substream->ops->open(substream)) < 0) 2198 goto error; 2199 2200 substream->hw_opened = 1; 2201 2202 err = snd_pcm_hw_constraints_complete(substream); 2203 if (err < 0) { 2204 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2205 goto error; 2206 } 2207 2208 *rsubstream = substream; 2209 return 0; 2210 2211 error: 2212 snd_pcm_release_substream(substream); 2213 return err; 2214 } 2215 2216 EXPORT_SYMBOL(snd_pcm_open_substream); 2217 2218 static int snd_pcm_open_file(struct file *file, 2219 struct snd_pcm *pcm, 2220 int stream) 2221 { 2222 struct snd_pcm_file *pcm_file; 2223 struct snd_pcm_substream *substream; 2224 int err; 2225 2226 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2227 if (err < 0) 2228 return err; 2229 2230 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2231 if (pcm_file == NULL) { 2232 snd_pcm_release_substream(substream); 2233 return -ENOMEM; 2234 } 2235 pcm_file->substream = substream; 2236 if (substream->ref_count == 1) { 2237 substream->file = pcm_file; 2238 substream->pcm_release = pcm_release_private; 2239 } 2240 file->private_data = pcm_file; 2241 2242 return 0; 2243 } 2244 2245 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2246 { 2247 struct snd_pcm *pcm; 2248 int err = nonseekable_open(inode, file); 2249 if (err < 0) 2250 return err; 2251 pcm = snd_lookup_minor_data(iminor(inode), 2252 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2253 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2254 if (pcm) 2255 snd_card_unref(pcm->card); 2256 return err; 2257 } 2258 2259 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2260 { 2261 struct snd_pcm *pcm; 2262 int err = nonseekable_open(inode, file); 2263 if (err < 0) 2264 return err; 2265 pcm = snd_lookup_minor_data(iminor(inode), 2266 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2267 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2268 if (pcm) 2269 snd_card_unref(pcm->card); 2270 return err; 2271 } 2272 2273 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2274 { 2275 int err; 2276 wait_queue_t wait; 2277 2278 if (pcm == NULL) { 2279 err = -ENODEV; 2280 goto __error1; 2281 } 2282 err = snd_card_file_add(pcm->card, file); 2283 if (err < 0) 2284 goto __error1; 2285 if (!try_module_get(pcm->card->module)) { 2286 err = -EFAULT; 2287 goto __error2; 2288 } 2289 init_waitqueue_entry(&wait, current); 2290 add_wait_queue(&pcm->open_wait, &wait); 2291 mutex_lock(&pcm->open_mutex); 2292 while (1) { 2293 err = snd_pcm_open_file(file, pcm, stream); 2294 if (err >= 0) 2295 break; 2296 if (err == -EAGAIN) { 2297 if (file->f_flags & O_NONBLOCK) { 2298 err = -EBUSY; 2299 break; 2300 } 2301 } else 2302 break; 2303 set_current_state(TASK_INTERRUPTIBLE); 2304 mutex_unlock(&pcm->open_mutex); 2305 schedule(); 2306 mutex_lock(&pcm->open_mutex); 2307 if (pcm->card->shutdown) { 2308 err = -ENODEV; 2309 break; 2310 } 2311 if (signal_pending(current)) { 2312 err = -ERESTARTSYS; 2313 break; 2314 } 2315 } 2316 remove_wait_queue(&pcm->open_wait, &wait); 2317 mutex_unlock(&pcm->open_mutex); 2318 if (err < 0) 2319 goto __error; 2320 return err; 2321 2322 __error: 2323 module_put(pcm->card->module); 2324 __error2: 2325 snd_card_file_remove(pcm->card, file); 2326 __error1: 2327 return err; 2328 } 2329 2330 static int snd_pcm_release(struct inode *inode, struct file *file) 2331 { 2332 struct snd_pcm *pcm; 2333 struct snd_pcm_substream *substream; 2334 struct snd_pcm_file *pcm_file; 2335 2336 pcm_file = file->private_data; 2337 substream = pcm_file->substream; 2338 if (snd_BUG_ON(!substream)) 2339 return -ENXIO; 2340 pcm = substream->pcm; 2341 mutex_lock(&pcm->open_mutex); 2342 snd_pcm_release_substream(substream); 2343 kfree(pcm_file); 2344 mutex_unlock(&pcm->open_mutex); 2345 wake_up(&pcm->open_wait); 2346 module_put(pcm->card->module); 2347 snd_card_file_remove(pcm->card, file); 2348 return 0; 2349 } 2350 2351 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2352 snd_pcm_uframes_t frames) 2353 { 2354 struct snd_pcm_runtime *runtime = substream->runtime; 2355 snd_pcm_sframes_t appl_ptr; 2356 snd_pcm_sframes_t ret; 2357 snd_pcm_sframes_t hw_avail; 2358 2359 if (frames == 0) 2360 return 0; 2361 2362 snd_pcm_stream_lock_irq(substream); 2363 switch (runtime->status->state) { 2364 case SNDRV_PCM_STATE_PREPARED: 2365 break; 2366 case SNDRV_PCM_STATE_DRAINING: 2367 case SNDRV_PCM_STATE_RUNNING: 2368 if (snd_pcm_update_hw_ptr(substream) >= 0) 2369 break; 2370 /* Fall through */ 2371 case SNDRV_PCM_STATE_XRUN: 2372 ret = -EPIPE; 2373 goto __end; 2374 case SNDRV_PCM_STATE_SUSPENDED: 2375 ret = -ESTRPIPE; 2376 goto __end; 2377 default: 2378 ret = -EBADFD; 2379 goto __end; 2380 } 2381 2382 hw_avail = snd_pcm_playback_hw_avail(runtime); 2383 if (hw_avail <= 0) { 2384 ret = 0; 2385 goto __end; 2386 } 2387 if (frames > (snd_pcm_uframes_t)hw_avail) 2388 frames = hw_avail; 2389 appl_ptr = runtime->control->appl_ptr - frames; 2390 if (appl_ptr < 0) 2391 appl_ptr += runtime->boundary; 2392 runtime->control->appl_ptr = appl_ptr; 2393 ret = frames; 2394 __end: 2395 snd_pcm_stream_unlock_irq(substream); 2396 return ret; 2397 } 2398 2399 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2400 snd_pcm_uframes_t frames) 2401 { 2402 struct snd_pcm_runtime *runtime = substream->runtime; 2403 snd_pcm_sframes_t appl_ptr; 2404 snd_pcm_sframes_t ret; 2405 snd_pcm_sframes_t hw_avail; 2406 2407 if (frames == 0) 2408 return 0; 2409 2410 snd_pcm_stream_lock_irq(substream); 2411 switch (runtime->status->state) { 2412 case SNDRV_PCM_STATE_PREPARED: 2413 case SNDRV_PCM_STATE_DRAINING: 2414 break; 2415 case SNDRV_PCM_STATE_RUNNING: 2416 if (snd_pcm_update_hw_ptr(substream) >= 0) 2417 break; 2418 /* Fall through */ 2419 case SNDRV_PCM_STATE_XRUN: 2420 ret = -EPIPE; 2421 goto __end; 2422 case SNDRV_PCM_STATE_SUSPENDED: 2423 ret = -ESTRPIPE; 2424 goto __end; 2425 default: 2426 ret = -EBADFD; 2427 goto __end; 2428 } 2429 2430 hw_avail = snd_pcm_capture_hw_avail(runtime); 2431 if (hw_avail <= 0) { 2432 ret = 0; 2433 goto __end; 2434 } 2435 if (frames > (snd_pcm_uframes_t)hw_avail) 2436 frames = hw_avail; 2437 appl_ptr = runtime->control->appl_ptr - frames; 2438 if (appl_ptr < 0) 2439 appl_ptr += runtime->boundary; 2440 runtime->control->appl_ptr = appl_ptr; 2441 ret = frames; 2442 __end: 2443 snd_pcm_stream_unlock_irq(substream); 2444 return ret; 2445 } 2446 2447 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2448 snd_pcm_uframes_t frames) 2449 { 2450 struct snd_pcm_runtime *runtime = substream->runtime; 2451 snd_pcm_sframes_t appl_ptr; 2452 snd_pcm_sframes_t ret; 2453 snd_pcm_sframes_t avail; 2454 2455 if (frames == 0) 2456 return 0; 2457 2458 snd_pcm_stream_lock_irq(substream); 2459 switch (runtime->status->state) { 2460 case SNDRV_PCM_STATE_PREPARED: 2461 case SNDRV_PCM_STATE_PAUSED: 2462 break; 2463 case SNDRV_PCM_STATE_DRAINING: 2464 case SNDRV_PCM_STATE_RUNNING: 2465 if (snd_pcm_update_hw_ptr(substream) >= 0) 2466 break; 2467 /* Fall through */ 2468 case SNDRV_PCM_STATE_XRUN: 2469 ret = -EPIPE; 2470 goto __end; 2471 case SNDRV_PCM_STATE_SUSPENDED: 2472 ret = -ESTRPIPE; 2473 goto __end; 2474 default: 2475 ret = -EBADFD; 2476 goto __end; 2477 } 2478 2479 avail = snd_pcm_playback_avail(runtime); 2480 if (avail <= 0) { 2481 ret = 0; 2482 goto __end; 2483 } 2484 if (frames > (snd_pcm_uframes_t)avail) 2485 frames = avail; 2486 appl_ptr = runtime->control->appl_ptr + frames; 2487 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2488 appl_ptr -= runtime->boundary; 2489 runtime->control->appl_ptr = appl_ptr; 2490 ret = frames; 2491 __end: 2492 snd_pcm_stream_unlock_irq(substream); 2493 return ret; 2494 } 2495 2496 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2497 snd_pcm_uframes_t frames) 2498 { 2499 struct snd_pcm_runtime *runtime = substream->runtime; 2500 snd_pcm_sframes_t appl_ptr; 2501 snd_pcm_sframes_t ret; 2502 snd_pcm_sframes_t avail; 2503 2504 if (frames == 0) 2505 return 0; 2506 2507 snd_pcm_stream_lock_irq(substream); 2508 switch (runtime->status->state) { 2509 case SNDRV_PCM_STATE_PREPARED: 2510 case SNDRV_PCM_STATE_DRAINING: 2511 case SNDRV_PCM_STATE_PAUSED: 2512 break; 2513 case SNDRV_PCM_STATE_RUNNING: 2514 if (snd_pcm_update_hw_ptr(substream) >= 0) 2515 break; 2516 /* Fall through */ 2517 case SNDRV_PCM_STATE_XRUN: 2518 ret = -EPIPE; 2519 goto __end; 2520 case SNDRV_PCM_STATE_SUSPENDED: 2521 ret = -ESTRPIPE; 2522 goto __end; 2523 default: 2524 ret = -EBADFD; 2525 goto __end; 2526 } 2527 2528 avail = snd_pcm_capture_avail(runtime); 2529 if (avail <= 0) { 2530 ret = 0; 2531 goto __end; 2532 } 2533 if (frames > (snd_pcm_uframes_t)avail) 2534 frames = avail; 2535 appl_ptr = runtime->control->appl_ptr + frames; 2536 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2537 appl_ptr -= runtime->boundary; 2538 runtime->control->appl_ptr = appl_ptr; 2539 ret = frames; 2540 __end: 2541 snd_pcm_stream_unlock_irq(substream); 2542 return ret; 2543 } 2544 2545 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2546 { 2547 struct snd_pcm_runtime *runtime = substream->runtime; 2548 int err; 2549 2550 snd_pcm_stream_lock_irq(substream); 2551 switch (runtime->status->state) { 2552 case SNDRV_PCM_STATE_DRAINING: 2553 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2554 goto __badfd; 2555 /* Fall through */ 2556 case SNDRV_PCM_STATE_RUNNING: 2557 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2558 break; 2559 /* Fall through */ 2560 case SNDRV_PCM_STATE_PREPARED: 2561 case SNDRV_PCM_STATE_SUSPENDED: 2562 err = 0; 2563 break; 2564 case SNDRV_PCM_STATE_XRUN: 2565 err = -EPIPE; 2566 break; 2567 default: 2568 __badfd: 2569 err = -EBADFD; 2570 break; 2571 } 2572 snd_pcm_stream_unlock_irq(substream); 2573 return err; 2574 } 2575 2576 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2577 snd_pcm_sframes_t __user *res) 2578 { 2579 struct snd_pcm_runtime *runtime = substream->runtime; 2580 int err; 2581 snd_pcm_sframes_t n = 0; 2582 2583 snd_pcm_stream_lock_irq(substream); 2584 switch (runtime->status->state) { 2585 case SNDRV_PCM_STATE_DRAINING: 2586 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2587 goto __badfd; 2588 /* Fall through */ 2589 case SNDRV_PCM_STATE_RUNNING: 2590 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2591 break; 2592 /* Fall through */ 2593 case SNDRV_PCM_STATE_PREPARED: 2594 case SNDRV_PCM_STATE_SUSPENDED: 2595 err = 0; 2596 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2597 n = snd_pcm_playback_hw_avail(runtime); 2598 else 2599 n = snd_pcm_capture_avail(runtime); 2600 n += runtime->delay; 2601 break; 2602 case SNDRV_PCM_STATE_XRUN: 2603 err = -EPIPE; 2604 break; 2605 default: 2606 __badfd: 2607 err = -EBADFD; 2608 break; 2609 } 2610 snd_pcm_stream_unlock_irq(substream); 2611 if (!err) 2612 if (put_user(n, res)) 2613 err = -EFAULT; 2614 return err; 2615 } 2616 2617 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2618 struct snd_pcm_sync_ptr __user *_sync_ptr) 2619 { 2620 struct snd_pcm_runtime *runtime = substream->runtime; 2621 struct snd_pcm_sync_ptr sync_ptr; 2622 volatile struct snd_pcm_mmap_status *status; 2623 volatile struct snd_pcm_mmap_control *control; 2624 int err; 2625 2626 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2627 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2628 return -EFAULT; 2629 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2630 return -EFAULT; 2631 status = runtime->status; 2632 control = runtime->control; 2633 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2634 err = snd_pcm_hwsync(substream); 2635 if (err < 0) 2636 return err; 2637 } 2638 snd_pcm_stream_lock_irq(substream); 2639 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 2640 control->appl_ptr = sync_ptr.c.control.appl_ptr; 2641 else 2642 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2643 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2644 control->avail_min = sync_ptr.c.control.avail_min; 2645 else 2646 sync_ptr.c.control.avail_min = control->avail_min; 2647 sync_ptr.s.status.state = status->state; 2648 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2649 sync_ptr.s.status.tstamp = status->tstamp; 2650 sync_ptr.s.status.suspended_state = status->suspended_state; 2651 snd_pcm_stream_unlock_irq(substream); 2652 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2653 return -EFAULT; 2654 return 0; 2655 } 2656 2657 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2658 { 2659 struct snd_pcm_runtime *runtime = substream->runtime; 2660 int arg; 2661 2662 if (get_user(arg, _arg)) 2663 return -EFAULT; 2664 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2665 return -EINVAL; 2666 runtime->tstamp_type = arg; 2667 return 0; 2668 } 2669 2670 static int snd_pcm_common_ioctl1(struct file *file, 2671 struct snd_pcm_substream *substream, 2672 unsigned int cmd, void __user *arg) 2673 { 2674 switch (cmd) { 2675 case SNDRV_PCM_IOCTL_PVERSION: 2676 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2677 case SNDRV_PCM_IOCTL_INFO: 2678 return snd_pcm_info_user(substream, arg); 2679 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2680 return 0; 2681 case SNDRV_PCM_IOCTL_TTSTAMP: 2682 return snd_pcm_tstamp(substream, arg); 2683 case SNDRV_PCM_IOCTL_HW_REFINE: 2684 return snd_pcm_hw_refine_user(substream, arg); 2685 case SNDRV_PCM_IOCTL_HW_PARAMS: 2686 return snd_pcm_hw_params_user(substream, arg); 2687 case SNDRV_PCM_IOCTL_HW_FREE: 2688 return snd_pcm_hw_free(substream); 2689 case SNDRV_PCM_IOCTL_SW_PARAMS: 2690 return snd_pcm_sw_params_user(substream, arg); 2691 case SNDRV_PCM_IOCTL_STATUS: 2692 return snd_pcm_status_user(substream, arg); 2693 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2694 return snd_pcm_channel_info_user(substream, arg); 2695 case SNDRV_PCM_IOCTL_PREPARE: 2696 return snd_pcm_prepare(substream, file); 2697 case SNDRV_PCM_IOCTL_RESET: 2698 return snd_pcm_reset(substream); 2699 case SNDRV_PCM_IOCTL_START: 2700 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); 2701 case SNDRV_PCM_IOCTL_LINK: 2702 return snd_pcm_link(substream, (int)(unsigned long) arg); 2703 case SNDRV_PCM_IOCTL_UNLINK: 2704 return snd_pcm_unlink(substream); 2705 case SNDRV_PCM_IOCTL_RESUME: 2706 return snd_pcm_resume(substream); 2707 case SNDRV_PCM_IOCTL_XRUN: 2708 return snd_pcm_xrun(substream); 2709 case SNDRV_PCM_IOCTL_HWSYNC: 2710 return snd_pcm_hwsync(substream); 2711 case SNDRV_PCM_IOCTL_DELAY: 2712 return snd_pcm_delay(substream, arg); 2713 case SNDRV_PCM_IOCTL_SYNC_PTR: 2714 return snd_pcm_sync_ptr(substream, arg); 2715 #ifdef CONFIG_SND_SUPPORT_OLD_API 2716 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2717 return snd_pcm_hw_refine_old_user(substream, arg); 2718 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2719 return snd_pcm_hw_params_old_user(substream, arg); 2720 #endif 2721 case SNDRV_PCM_IOCTL_DRAIN: 2722 return snd_pcm_drain(substream, file); 2723 case SNDRV_PCM_IOCTL_DROP: 2724 return snd_pcm_drop(substream); 2725 case SNDRV_PCM_IOCTL_PAUSE: 2726 { 2727 int res; 2728 snd_pcm_stream_lock_irq(substream); 2729 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2730 snd_pcm_stream_unlock_irq(substream); 2731 return res; 2732 } 2733 } 2734 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2735 return -ENOTTY; 2736 } 2737 2738 static int snd_pcm_playback_ioctl1(struct file *file, 2739 struct snd_pcm_substream *substream, 2740 unsigned int cmd, void __user *arg) 2741 { 2742 if (snd_BUG_ON(!substream)) 2743 return -ENXIO; 2744 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2745 return -EINVAL; 2746 switch (cmd) { 2747 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2748 { 2749 struct snd_xferi xferi; 2750 struct snd_xferi __user *_xferi = arg; 2751 struct snd_pcm_runtime *runtime = substream->runtime; 2752 snd_pcm_sframes_t result; 2753 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2754 return -EBADFD; 2755 if (put_user(0, &_xferi->result)) 2756 return -EFAULT; 2757 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2758 return -EFAULT; 2759 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2760 __put_user(result, &_xferi->result); 2761 return result < 0 ? result : 0; 2762 } 2763 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2764 { 2765 struct snd_xfern xfern; 2766 struct snd_xfern __user *_xfern = arg; 2767 struct snd_pcm_runtime *runtime = substream->runtime; 2768 void __user **bufs; 2769 snd_pcm_sframes_t result; 2770 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2771 return -EBADFD; 2772 if (runtime->channels > 128) 2773 return -EINVAL; 2774 if (put_user(0, &_xfern->result)) 2775 return -EFAULT; 2776 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2777 return -EFAULT; 2778 2779 bufs = memdup_user(xfern.bufs, 2780 sizeof(void *) * runtime->channels); 2781 if (IS_ERR(bufs)) 2782 return PTR_ERR(bufs); 2783 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2784 kfree(bufs); 2785 __put_user(result, &_xfern->result); 2786 return result < 0 ? result : 0; 2787 } 2788 case SNDRV_PCM_IOCTL_REWIND: 2789 { 2790 snd_pcm_uframes_t frames; 2791 snd_pcm_uframes_t __user *_frames = arg; 2792 snd_pcm_sframes_t result; 2793 if (get_user(frames, _frames)) 2794 return -EFAULT; 2795 if (put_user(0, _frames)) 2796 return -EFAULT; 2797 result = snd_pcm_playback_rewind(substream, frames); 2798 __put_user(result, _frames); 2799 return result < 0 ? result : 0; 2800 } 2801 case SNDRV_PCM_IOCTL_FORWARD: 2802 { 2803 snd_pcm_uframes_t frames; 2804 snd_pcm_uframes_t __user *_frames = arg; 2805 snd_pcm_sframes_t result; 2806 if (get_user(frames, _frames)) 2807 return -EFAULT; 2808 if (put_user(0, _frames)) 2809 return -EFAULT; 2810 result = snd_pcm_playback_forward(substream, frames); 2811 __put_user(result, _frames); 2812 return result < 0 ? result : 0; 2813 } 2814 } 2815 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2816 } 2817 2818 static int snd_pcm_capture_ioctl1(struct file *file, 2819 struct snd_pcm_substream *substream, 2820 unsigned int cmd, void __user *arg) 2821 { 2822 if (snd_BUG_ON(!substream)) 2823 return -ENXIO; 2824 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2825 return -EINVAL; 2826 switch (cmd) { 2827 case SNDRV_PCM_IOCTL_READI_FRAMES: 2828 { 2829 struct snd_xferi xferi; 2830 struct snd_xferi __user *_xferi = arg; 2831 struct snd_pcm_runtime *runtime = substream->runtime; 2832 snd_pcm_sframes_t result; 2833 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2834 return -EBADFD; 2835 if (put_user(0, &_xferi->result)) 2836 return -EFAULT; 2837 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2838 return -EFAULT; 2839 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2840 __put_user(result, &_xferi->result); 2841 return result < 0 ? result : 0; 2842 } 2843 case SNDRV_PCM_IOCTL_READN_FRAMES: 2844 { 2845 struct snd_xfern xfern; 2846 struct snd_xfern __user *_xfern = arg; 2847 struct snd_pcm_runtime *runtime = substream->runtime; 2848 void *bufs; 2849 snd_pcm_sframes_t result; 2850 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2851 return -EBADFD; 2852 if (runtime->channels > 128) 2853 return -EINVAL; 2854 if (put_user(0, &_xfern->result)) 2855 return -EFAULT; 2856 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2857 return -EFAULT; 2858 2859 bufs = memdup_user(xfern.bufs, 2860 sizeof(void *) * runtime->channels); 2861 if (IS_ERR(bufs)) 2862 return PTR_ERR(bufs); 2863 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2864 kfree(bufs); 2865 __put_user(result, &_xfern->result); 2866 return result < 0 ? result : 0; 2867 } 2868 case SNDRV_PCM_IOCTL_REWIND: 2869 { 2870 snd_pcm_uframes_t frames; 2871 snd_pcm_uframes_t __user *_frames = arg; 2872 snd_pcm_sframes_t result; 2873 if (get_user(frames, _frames)) 2874 return -EFAULT; 2875 if (put_user(0, _frames)) 2876 return -EFAULT; 2877 result = snd_pcm_capture_rewind(substream, frames); 2878 __put_user(result, _frames); 2879 return result < 0 ? result : 0; 2880 } 2881 case SNDRV_PCM_IOCTL_FORWARD: 2882 { 2883 snd_pcm_uframes_t frames; 2884 snd_pcm_uframes_t __user *_frames = arg; 2885 snd_pcm_sframes_t result; 2886 if (get_user(frames, _frames)) 2887 return -EFAULT; 2888 if (put_user(0, _frames)) 2889 return -EFAULT; 2890 result = snd_pcm_capture_forward(substream, frames); 2891 __put_user(result, _frames); 2892 return result < 0 ? result : 0; 2893 } 2894 } 2895 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2896 } 2897 2898 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2899 unsigned long arg) 2900 { 2901 struct snd_pcm_file *pcm_file; 2902 2903 pcm_file = file->private_data; 2904 2905 if (((cmd >> 8) & 0xff) != 'A') 2906 return -ENOTTY; 2907 2908 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2909 (void __user *)arg); 2910 } 2911 2912 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2913 unsigned long arg) 2914 { 2915 struct snd_pcm_file *pcm_file; 2916 2917 pcm_file = file->private_data; 2918 2919 if (((cmd >> 8) & 0xff) != 'A') 2920 return -ENOTTY; 2921 2922 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2923 (void __user *)arg); 2924 } 2925 2926 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2927 unsigned int cmd, void *arg) 2928 { 2929 mm_segment_t fs; 2930 int result; 2931 2932 fs = snd_enter_user(); 2933 switch (substream->stream) { 2934 case SNDRV_PCM_STREAM_PLAYBACK: 2935 result = snd_pcm_playback_ioctl1(NULL, substream, cmd, 2936 (void __user *)arg); 2937 break; 2938 case SNDRV_PCM_STREAM_CAPTURE: 2939 result = snd_pcm_capture_ioctl1(NULL, substream, cmd, 2940 (void __user *)arg); 2941 break; 2942 default: 2943 result = -EINVAL; 2944 break; 2945 } 2946 snd_leave_user(fs); 2947 return result; 2948 } 2949 2950 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2951 2952 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2953 loff_t * offset) 2954 { 2955 struct snd_pcm_file *pcm_file; 2956 struct snd_pcm_substream *substream; 2957 struct snd_pcm_runtime *runtime; 2958 snd_pcm_sframes_t result; 2959 2960 pcm_file = file->private_data; 2961 substream = pcm_file->substream; 2962 if (PCM_RUNTIME_CHECK(substream)) 2963 return -ENXIO; 2964 runtime = substream->runtime; 2965 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2966 return -EBADFD; 2967 if (!frame_aligned(runtime, count)) 2968 return -EINVAL; 2969 count = bytes_to_frames(runtime, count); 2970 result = snd_pcm_lib_read(substream, buf, count); 2971 if (result > 0) 2972 result = frames_to_bytes(runtime, result); 2973 return result; 2974 } 2975 2976 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 2977 size_t count, loff_t * offset) 2978 { 2979 struct snd_pcm_file *pcm_file; 2980 struct snd_pcm_substream *substream; 2981 struct snd_pcm_runtime *runtime; 2982 snd_pcm_sframes_t result; 2983 2984 pcm_file = file->private_data; 2985 substream = pcm_file->substream; 2986 if (PCM_RUNTIME_CHECK(substream)) 2987 return -ENXIO; 2988 runtime = substream->runtime; 2989 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2990 return -EBADFD; 2991 if (!frame_aligned(runtime, count)) 2992 return -EINVAL; 2993 count = bytes_to_frames(runtime, count); 2994 result = snd_pcm_lib_write(substream, buf, count); 2995 if (result > 0) 2996 result = frames_to_bytes(runtime, result); 2997 return result; 2998 } 2999 3000 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov, 3001 unsigned long nr_segs, loff_t pos) 3002 3003 { 3004 struct snd_pcm_file *pcm_file; 3005 struct snd_pcm_substream *substream; 3006 struct snd_pcm_runtime *runtime; 3007 snd_pcm_sframes_t result; 3008 unsigned long i; 3009 void __user **bufs; 3010 snd_pcm_uframes_t frames; 3011 3012 pcm_file = iocb->ki_filp->private_data; 3013 substream = pcm_file->substream; 3014 if (PCM_RUNTIME_CHECK(substream)) 3015 return -ENXIO; 3016 runtime = substream->runtime; 3017 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3018 return -EBADFD; 3019 if (nr_segs > 1024 || nr_segs != runtime->channels) 3020 return -EINVAL; 3021 if (!frame_aligned(runtime, iov->iov_len)) 3022 return -EINVAL; 3023 frames = bytes_to_samples(runtime, iov->iov_len); 3024 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 3025 if (bufs == NULL) 3026 return -ENOMEM; 3027 for (i = 0; i < nr_segs; ++i) 3028 bufs[i] = iov[i].iov_base; 3029 result = snd_pcm_lib_readv(substream, bufs, frames); 3030 if (result > 0) 3031 result = frames_to_bytes(runtime, result); 3032 kfree(bufs); 3033 return result; 3034 } 3035 3036 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov, 3037 unsigned long nr_segs, loff_t pos) 3038 { 3039 struct snd_pcm_file *pcm_file; 3040 struct snd_pcm_substream *substream; 3041 struct snd_pcm_runtime *runtime; 3042 snd_pcm_sframes_t result; 3043 unsigned long i; 3044 void __user **bufs; 3045 snd_pcm_uframes_t frames; 3046 3047 pcm_file = iocb->ki_filp->private_data; 3048 substream = pcm_file->substream; 3049 if (PCM_RUNTIME_CHECK(substream)) 3050 return -ENXIO; 3051 runtime = substream->runtime; 3052 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3053 return -EBADFD; 3054 if (nr_segs > 128 || nr_segs != runtime->channels || 3055 !frame_aligned(runtime, iov->iov_len)) 3056 return -EINVAL; 3057 frames = bytes_to_samples(runtime, iov->iov_len); 3058 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 3059 if (bufs == NULL) 3060 return -ENOMEM; 3061 for (i = 0; i < nr_segs; ++i) 3062 bufs[i] = iov[i].iov_base; 3063 result = snd_pcm_lib_writev(substream, bufs, frames); 3064 if (result > 0) 3065 result = frames_to_bytes(runtime, result); 3066 kfree(bufs); 3067 return result; 3068 } 3069 3070 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3071 { 3072 struct snd_pcm_file *pcm_file; 3073 struct snd_pcm_substream *substream; 3074 struct snd_pcm_runtime *runtime; 3075 unsigned int mask; 3076 snd_pcm_uframes_t avail; 3077 3078 pcm_file = file->private_data; 3079 3080 substream = pcm_file->substream; 3081 if (PCM_RUNTIME_CHECK(substream)) 3082 return -ENXIO; 3083 runtime = substream->runtime; 3084 3085 poll_wait(file, &runtime->sleep, wait); 3086 3087 snd_pcm_stream_lock_irq(substream); 3088 avail = snd_pcm_playback_avail(runtime); 3089 switch (runtime->status->state) { 3090 case SNDRV_PCM_STATE_RUNNING: 3091 case SNDRV_PCM_STATE_PREPARED: 3092 case SNDRV_PCM_STATE_PAUSED: 3093 if (avail >= runtime->control->avail_min) { 3094 mask = POLLOUT | POLLWRNORM; 3095 break; 3096 } 3097 /* Fall through */ 3098 case SNDRV_PCM_STATE_DRAINING: 3099 mask = 0; 3100 break; 3101 default: 3102 mask = POLLOUT | POLLWRNORM | POLLERR; 3103 break; 3104 } 3105 snd_pcm_stream_unlock_irq(substream); 3106 return mask; 3107 } 3108 3109 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3110 { 3111 struct snd_pcm_file *pcm_file; 3112 struct snd_pcm_substream *substream; 3113 struct snd_pcm_runtime *runtime; 3114 unsigned int mask; 3115 snd_pcm_uframes_t avail; 3116 3117 pcm_file = file->private_data; 3118 3119 substream = pcm_file->substream; 3120 if (PCM_RUNTIME_CHECK(substream)) 3121 return -ENXIO; 3122 runtime = substream->runtime; 3123 3124 poll_wait(file, &runtime->sleep, wait); 3125 3126 snd_pcm_stream_lock_irq(substream); 3127 avail = snd_pcm_capture_avail(runtime); 3128 switch (runtime->status->state) { 3129 case SNDRV_PCM_STATE_RUNNING: 3130 case SNDRV_PCM_STATE_PREPARED: 3131 case SNDRV_PCM_STATE_PAUSED: 3132 if (avail >= runtime->control->avail_min) { 3133 mask = POLLIN | POLLRDNORM; 3134 break; 3135 } 3136 mask = 0; 3137 break; 3138 case SNDRV_PCM_STATE_DRAINING: 3139 if (avail > 0) { 3140 mask = POLLIN | POLLRDNORM; 3141 break; 3142 } 3143 /* Fall through */ 3144 default: 3145 mask = POLLIN | POLLRDNORM | POLLERR; 3146 break; 3147 } 3148 snd_pcm_stream_unlock_irq(substream); 3149 return mask; 3150 } 3151 3152 /* 3153 * mmap support 3154 */ 3155 3156 /* 3157 * Only on coherent architectures, we can mmap the status and the control records 3158 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3159 */ 3160 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3161 /* 3162 * mmap status record 3163 */ 3164 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area, 3165 struct vm_fault *vmf) 3166 { 3167 struct snd_pcm_substream *substream = area->vm_private_data; 3168 struct snd_pcm_runtime *runtime; 3169 3170 if (substream == NULL) 3171 return VM_FAULT_SIGBUS; 3172 runtime = substream->runtime; 3173 vmf->page = virt_to_page(runtime->status); 3174 get_page(vmf->page); 3175 return 0; 3176 } 3177 3178 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3179 { 3180 .fault = snd_pcm_mmap_status_fault, 3181 }; 3182 3183 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3184 struct vm_area_struct *area) 3185 { 3186 long size; 3187 if (!(area->vm_flags & VM_READ)) 3188 return -EINVAL; 3189 size = area->vm_end - area->vm_start; 3190 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3191 return -EINVAL; 3192 area->vm_ops = &snd_pcm_vm_ops_status; 3193 area->vm_private_data = substream; 3194 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3195 return 0; 3196 } 3197 3198 /* 3199 * mmap control record 3200 */ 3201 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area, 3202 struct vm_fault *vmf) 3203 { 3204 struct snd_pcm_substream *substream = area->vm_private_data; 3205 struct snd_pcm_runtime *runtime; 3206 3207 if (substream == NULL) 3208 return VM_FAULT_SIGBUS; 3209 runtime = substream->runtime; 3210 vmf->page = virt_to_page(runtime->control); 3211 get_page(vmf->page); 3212 return 0; 3213 } 3214 3215 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3216 { 3217 .fault = snd_pcm_mmap_control_fault, 3218 }; 3219 3220 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3221 struct vm_area_struct *area) 3222 { 3223 long size; 3224 if (!(area->vm_flags & VM_READ)) 3225 return -EINVAL; 3226 size = area->vm_end - area->vm_start; 3227 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3228 return -EINVAL; 3229 area->vm_ops = &snd_pcm_vm_ops_control; 3230 area->vm_private_data = substream; 3231 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3232 return 0; 3233 } 3234 #else /* ! coherent mmap */ 3235 /* 3236 * don't support mmap for status and control records. 3237 */ 3238 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3239 struct vm_area_struct *area) 3240 { 3241 return -ENXIO; 3242 } 3243 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3244 struct vm_area_struct *area) 3245 { 3246 return -ENXIO; 3247 } 3248 #endif /* coherent mmap */ 3249 3250 static inline struct page * 3251 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3252 { 3253 void *vaddr = substream->runtime->dma_area + ofs; 3254 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3255 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3256 return virt_to_page(CAC_ADDR(vaddr)); 3257 #endif 3258 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE) 3259 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) { 3260 dma_addr_t addr = substream->runtime->dma_addr + ofs; 3261 addr -= get_dma_offset(substream->dma_buffer.dev.dev); 3262 /* assume dma_handle set via pfn_to_phys() in 3263 * mm/dma-noncoherent.c 3264 */ 3265 return pfn_to_page(addr >> PAGE_SHIFT); 3266 } 3267 #endif 3268 return virt_to_page(vaddr); 3269 } 3270 3271 /* 3272 * fault callback for mmapping a RAM page 3273 */ 3274 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area, 3275 struct vm_fault *vmf) 3276 { 3277 struct snd_pcm_substream *substream = area->vm_private_data; 3278 struct snd_pcm_runtime *runtime; 3279 unsigned long offset; 3280 struct page * page; 3281 size_t dma_bytes; 3282 3283 if (substream == NULL) 3284 return VM_FAULT_SIGBUS; 3285 runtime = substream->runtime; 3286 offset = vmf->pgoff << PAGE_SHIFT; 3287 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3288 if (offset > dma_bytes - PAGE_SIZE) 3289 return VM_FAULT_SIGBUS; 3290 if (substream->ops->page) 3291 page = substream->ops->page(substream, offset); 3292 else 3293 page = snd_pcm_default_page_ops(substream, offset); 3294 if (!page) 3295 return VM_FAULT_SIGBUS; 3296 get_page(page); 3297 vmf->page = page; 3298 return 0; 3299 } 3300 3301 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3302 .open = snd_pcm_mmap_data_open, 3303 .close = snd_pcm_mmap_data_close, 3304 }; 3305 3306 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3307 .open = snd_pcm_mmap_data_open, 3308 .close = snd_pcm_mmap_data_close, 3309 .fault = snd_pcm_mmap_data_fault, 3310 }; 3311 3312 #ifndef ARCH_HAS_DMA_MMAP_COHERENT 3313 /* This should be defined / handled globally! */ 3314 #ifdef CONFIG_ARM 3315 #define ARCH_HAS_DMA_MMAP_COHERENT 3316 #endif 3317 #endif 3318 3319 /* 3320 * mmap the DMA buffer on RAM 3321 */ 3322 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3323 struct vm_area_struct *area) 3324 { 3325 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3326 #ifdef CONFIG_GENERIC_ALLOCATOR 3327 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3328 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3329 return remap_pfn_range(area, area->vm_start, 3330 substream->dma_buffer.addr >> PAGE_SHIFT, 3331 area->vm_end - area->vm_start, area->vm_page_prot); 3332 } 3333 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3334 #ifdef ARCH_HAS_DMA_MMAP_COHERENT 3335 if (!substream->ops->page && 3336 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3337 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3338 area, 3339 substream->runtime->dma_area, 3340 substream->runtime->dma_addr, 3341 area->vm_end - area->vm_start); 3342 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3343 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV && 3344 !plat_device_is_coherent(substream->dma_buffer.dev.dev)) 3345 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3346 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */ 3347 /* mmap with fault handler */ 3348 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3349 return 0; 3350 } 3351 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3352 3353 /* 3354 * mmap the DMA buffer on I/O memory area 3355 */ 3356 #if SNDRV_PCM_INFO_MMAP_IOMEM 3357 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3358 struct vm_area_struct *area) 3359 { 3360 struct snd_pcm_runtime *runtime = substream->runtime;; 3361 3362 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3363 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3364 } 3365 3366 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3367 #endif /* SNDRV_PCM_INFO_MMAP */ 3368 3369 /* 3370 * mmap DMA buffer 3371 */ 3372 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3373 struct vm_area_struct *area) 3374 { 3375 struct snd_pcm_runtime *runtime; 3376 long size; 3377 unsigned long offset; 3378 size_t dma_bytes; 3379 int err; 3380 3381 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3382 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3383 return -EINVAL; 3384 } else { 3385 if (!(area->vm_flags & VM_READ)) 3386 return -EINVAL; 3387 } 3388 runtime = substream->runtime; 3389 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3390 return -EBADFD; 3391 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3392 return -ENXIO; 3393 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3394 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3395 return -EINVAL; 3396 size = area->vm_end - area->vm_start; 3397 offset = area->vm_pgoff << PAGE_SHIFT; 3398 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3399 if ((size_t)size > dma_bytes) 3400 return -EINVAL; 3401 if (offset > dma_bytes - size) 3402 return -EINVAL; 3403 3404 area->vm_ops = &snd_pcm_vm_ops_data; 3405 area->vm_private_data = substream; 3406 if (substream->ops->mmap) 3407 err = substream->ops->mmap(substream, area); 3408 else 3409 err = snd_pcm_lib_default_mmap(substream, area); 3410 if (!err) 3411 atomic_inc(&substream->mmap_count); 3412 return err; 3413 } 3414 3415 EXPORT_SYMBOL(snd_pcm_mmap_data); 3416 3417 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3418 { 3419 struct snd_pcm_file * pcm_file; 3420 struct snd_pcm_substream *substream; 3421 unsigned long offset; 3422 3423 pcm_file = file->private_data; 3424 substream = pcm_file->substream; 3425 if (PCM_RUNTIME_CHECK(substream)) 3426 return -ENXIO; 3427 3428 offset = area->vm_pgoff << PAGE_SHIFT; 3429 switch (offset) { 3430 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3431 if (pcm_file->no_compat_mmap) 3432 return -ENXIO; 3433 return snd_pcm_mmap_status(substream, file, area); 3434 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3435 if (pcm_file->no_compat_mmap) 3436 return -ENXIO; 3437 return snd_pcm_mmap_control(substream, file, area); 3438 default: 3439 return snd_pcm_mmap_data(substream, file, area); 3440 } 3441 return 0; 3442 } 3443 3444 static int snd_pcm_fasync(int fd, struct file * file, int on) 3445 { 3446 struct snd_pcm_file * pcm_file; 3447 struct snd_pcm_substream *substream; 3448 struct snd_pcm_runtime *runtime; 3449 3450 pcm_file = file->private_data; 3451 substream = pcm_file->substream; 3452 if (PCM_RUNTIME_CHECK(substream)) 3453 return -ENXIO; 3454 runtime = substream->runtime; 3455 return fasync_helper(fd, file, on, &runtime->fasync); 3456 } 3457 3458 /* 3459 * ioctl32 compat 3460 */ 3461 #ifdef CONFIG_COMPAT 3462 #include "pcm_compat.c" 3463 #else 3464 #define snd_pcm_ioctl_compat NULL 3465 #endif 3466 3467 /* 3468 * To be removed helpers to keep binary compatibility 3469 */ 3470 3471 #ifdef CONFIG_SND_SUPPORT_OLD_API 3472 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3473 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3474 3475 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3476 struct snd_pcm_hw_params_old *oparams) 3477 { 3478 unsigned int i; 3479 3480 memset(params, 0, sizeof(*params)); 3481 params->flags = oparams->flags; 3482 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3483 params->masks[i].bits[0] = oparams->masks[i]; 3484 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3485 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3486 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3487 params->info = oparams->info; 3488 params->msbits = oparams->msbits; 3489 params->rate_num = oparams->rate_num; 3490 params->rate_den = oparams->rate_den; 3491 params->fifo_size = oparams->fifo_size; 3492 } 3493 3494 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3495 struct snd_pcm_hw_params *params) 3496 { 3497 unsigned int i; 3498 3499 memset(oparams, 0, sizeof(*oparams)); 3500 oparams->flags = params->flags; 3501 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3502 oparams->masks[i] = params->masks[i].bits[0]; 3503 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3504 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3505 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3506 oparams->info = params->info; 3507 oparams->msbits = params->msbits; 3508 oparams->rate_num = params->rate_num; 3509 oparams->rate_den = params->rate_den; 3510 oparams->fifo_size = params->fifo_size; 3511 } 3512 3513 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3514 struct snd_pcm_hw_params_old __user * _oparams) 3515 { 3516 struct snd_pcm_hw_params *params; 3517 struct snd_pcm_hw_params_old *oparams = NULL; 3518 int err; 3519 3520 params = kmalloc(sizeof(*params), GFP_KERNEL); 3521 if (!params) 3522 return -ENOMEM; 3523 3524 oparams = memdup_user(_oparams, sizeof(*oparams)); 3525 if (IS_ERR(oparams)) { 3526 err = PTR_ERR(oparams); 3527 goto out; 3528 } 3529 snd_pcm_hw_convert_from_old_params(params, oparams); 3530 err = snd_pcm_hw_refine(substream, params); 3531 snd_pcm_hw_convert_to_old_params(oparams, params); 3532 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3533 if (!err) 3534 err = -EFAULT; 3535 } 3536 3537 kfree(oparams); 3538 out: 3539 kfree(params); 3540 return err; 3541 } 3542 3543 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3544 struct snd_pcm_hw_params_old __user * _oparams) 3545 { 3546 struct snd_pcm_hw_params *params; 3547 struct snd_pcm_hw_params_old *oparams = NULL; 3548 int err; 3549 3550 params = kmalloc(sizeof(*params), GFP_KERNEL); 3551 if (!params) 3552 return -ENOMEM; 3553 3554 oparams = memdup_user(_oparams, sizeof(*oparams)); 3555 if (IS_ERR(oparams)) { 3556 err = PTR_ERR(oparams); 3557 goto out; 3558 } 3559 snd_pcm_hw_convert_from_old_params(params, oparams); 3560 err = snd_pcm_hw_params(substream, params); 3561 snd_pcm_hw_convert_to_old_params(oparams, params); 3562 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3563 if (!err) 3564 err = -EFAULT; 3565 } 3566 3567 kfree(oparams); 3568 out: 3569 kfree(params); 3570 return err; 3571 } 3572 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3573 3574 #ifndef CONFIG_MMU 3575 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3576 unsigned long addr, 3577 unsigned long len, 3578 unsigned long pgoff, 3579 unsigned long flags) 3580 { 3581 struct snd_pcm_file *pcm_file = file->private_data; 3582 struct snd_pcm_substream *substream = pcm_file->substream; 3583 struct snd_pcm_runtime *runtime = substream->runtime; 3584 unsigned long offset = pgoff << PAGE_SHIFT; 3585 3586 switch (offset) { 3587 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3588 return (unsigned long)runtime->status; 3589 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3590 return (unsigned long)runtime->control; 3591 default: 3592 return (unsigned long)runtime->dma_area + offset; 3593 } 3594 } 3595 #else 3596 # define snd_pcm_get_unmapped_area NULL 3597 #endif 3598 3599 /* 3600 * Register section 3601 */ 3602 3603 const struct file_operations snd_pcm_f_ops[2] = { 3604 { 3605 .owner = THIS_MODULE, 3606 .write = snd_pcm_write, 3607 .aio_write = snd_pcm_aio_write, 3608 .open = snd_pcm_playback_open, 3609 .release = snd_pcm_release, 3610 .llseek = no_llseek, 3611 .poll = snd_pcm_playback_poll, 3612 .unlocked_ioctl = snd_pcm_playback_ioctl, 3613 .compat_ioctl = snd_pcm_ioctl_compat, 3614 .mmap = snd_pcm_mmap, 3615 .fasync = snd_pcm_fasync, 3616 .get_unmapped_area = snd_pcm_get_unmapped_area, 3617 }, 3618 { 3619 .owner = THIS_MODULE, 3620 .read = snd_pcm_read, 3621 .aio_read = snd_pcm_aio_read, 3622 .open = snd_pcm_capture_open, 3623 .release = snd_pcm_release, 3624 .llseek = no_llseek, 3625 .poll = snd_pcm_capture_poll, 3626 .unlocked_ioctl = snd_pcm_capture_ioctl, 3627 .compat_ioctl = snd_pcm_ioctl_compat, 3628 .mmap = snd_pcm_mmap, 3629 .fasync = snd_pcm_fasync, 3630 .get_unmapped_area = snd_pcm_get_unmapped_area, 3631 } 3632 }; 3633