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, depth = 1; 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, depth); 790 else 791 spin_lock_nested(&s->self_group.lock, depth); 792 depth++; 793 } 794 res = ops->pre_action(s, state); 795 if (res < 0) 796 goto _unlock; 797 } 798 snd_pcm_group_for_each_entry(s, substream) { 799 res = ops->do_action(s, state); 800 if (res < 0) { 801 if (ops->undo_action) { 802 snd_pcm_group_for_each_entry(s1, substream) { 803 if (s1 == s) /* failed stream */ 804 break; 805 ops->undo_action(s1, state); 806 } 807 } 808 s = NULL; /* unlock all */ 809 goto _unlock; 810 } 811 } 812 snd_pcm_group_for_each_entry(s, substream) { 813 ops->post_action(s, state); 814 } 815 _unlock: 816 if (do_lock) { 817 /* unlock streams */ 818 snd_pcm_group_for_each_entry(s1, substream) { 819 if (s1 != substream) { 820 if (s1->pcm->nonatomic) 821 mutex_unlock(&s1->self_group.mutex); 822 else 823 spin_unlock(&s1->self_group.lock); 824 } 825 if (s1 == s) /* end */ 826 break; 827 } 828 } 829 return res; 830 } 831 832 /* 833 * Note: call with stream lock 834 */ 835 static int snd_pcm_action_single(struct action_ops *ops, 836 struct snd_pcm_substream *substream, 837 int state) 838 { 839 int res; 840 841 res = ops->pre_action(substream, state); 842 if (res < 0) 843 return res; 844 res = ops->do_action(substream, state); 845 if (res == 0) 846 ops->post_action(substream, state); 847 else if (ops->undo_action) 848 ops->undo_action(substream, state); 849 return res; 850 } 851 852 /* call in mutex-protected context */ 853 static int snd_pcm_action_mutex(struct action_ops *ops, 854 struct snd_pcm_substream *substream, 855 int state) 856 { 857 int res; 858 859 if (snd_pcm_stream_linked(substream)) { 860 if (!mutex_trylock(&substream->group->mutex)) { 861 mutex_unlock(&substream->self_group.mutex); 862 mutex_lock(&substream->group->mutex); 863 mutex_lock(&substream->self_group.mutex); 864 } 865 res = snd_pcm_action_group(ops, substream, state, 1); 866 mutex_unlock(&substream->group->mutex); 867 } else { 868 res = snd_pcm_action_single(ops, substream, state); 869 } 870 return res; 871 } 872 873 /* 874 * Note: call with stream lock 875 */ 876 static int snd_pcm_action(struct action_ops *ops, 877 struct snd_pcm_substream *substream, 878 int state) 879 { 880 int res; 881 882 if (substream->pcm->nonatomic) 883 return snd_pcm_action_mutex(ops, substream, state); 884 885 if (snd_pcm_stream_linked(substream)) { 886 if (!spin_trylock(&substream->group->lock)) { 887 spin_unlock(&substream->self_group.lock); 888 spin_lock(&substream->group->lock); 889 spin_lock(&substream->self_group.lock); 890 } 891 res = snd_pcm_action_group(ops, substream, state, 1); 892 spin_unlock(&substream->group->lock); 893 } else { 894 res = snd_pcm_action_single(ops, substream, state); 895 } 896 return res; 897 } 898 899 static int snd_pcm_action_lock_mutex(struct action_ops *ops, 900 struct snd_pcm_substream *substream, 901 int state) 902 { 903 int res; 904 905 down_read(&snd_pcm_link_rwsem); 906 if (snd_pcm_stream_linked(substream)) { 907 mutex_lock(&substream->group->mutex); 908 mutex_lock(&substream->self_group.mutex); 909 res = snd_pcm_action_group(ops, substream, state, 1); 910 mutex_unlock(&substream->self_group.mutex); 911 mutex_unlock(&substream->group->mutex); 912 } else { 913 mutex_lock(&substream->self_group.mutex); 914 res = snd_pcm_action_single(ops, substream, state); 915 mutex_unlock(&substream->self_group.mutex); 916 } 917 up_read(&snd_pcm_link_rwsem); 918 return res; 919 } 920 921 /* 922 * Note: don't use any locks before 923 */ 924 static int snd_pcm_action_lock_irq(struct action_ops *ops, 925 struct snd_pcm_substream *substream, 926 int state) 927 { 928 int res; 929 930 if (substream->pcm->nonatomic) 931 return snd_pcm_action_lock_mutex(ops, substream, state); 932 933 read_lock_irq(&snd_pcm_link_rwlock); 934 if (snd_pcm_stream_linked(substream)) { 935 spin_lock(&substream->group->lock); 936 spin_lock(&substream->self_group.lock); 937 res = snd_pcm_action_group(ops, substream, state, 1); 938 spin_unlock(&substream->self_group.lock); 939 spin_unlock(&substream->group->lock); 940 } else { 941 spin_lock(&substream->self_group.lock); 942 res = snd_pcm_action_single(ops, substream, state); 943 spin_unlock(&substream->self_group.lock); 944 } 945 read_unlock_irq(&snd_pcm_link_rwlock); 946 return res; 947 } 948 949 /* 950 */ 951 static int snd_pcm_action_nonatomic(struct action_ops *ops, 952 struct snd_pcm_substream *substream, 953 int state) 954 { 955 int res; 956 957 down_read(&snd_pcm_link_rwsem); 958 if (snd_pcm_stream_linked(substream)) 959 res = snd_pcm_action_group(ops, substream, state, 0); 960 else 961 res = snd_pcm_action_single(ops, substream, state); 962 up_read(&snd_pcm_link_rwsem); 963 return res; 964 } 965 966 /* 967 * start callbacks 968 */ 969 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 970 { 971 struct snd_pcm_runtime *runtime = substream->runtime; 972 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 973 return -EBADFD; 974 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 975 !snd_pcm_playback_data(substream)) 976 return -EPIPE; 977 runtime->trigger_master = substream; 978 return 0; 979 } 980 981 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 982 { 983 if (substream->runtime->trigger_master != substream) 984 return 0; 985 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 986 } 987 988 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 989 { 990 if (substream->runtime->trigger_master == substream) 991 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 992 } 993 994 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 995 { 996 struct snd_pcm_runtime *runtime = substream->runtime; 997 snd_pcm_trigger_tstamp(substream); 998 runtime->hw_ptr_jiffies = jiffies; 999 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1000 runtime->rate; 1001 runtime->status->state = state; 1002 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1003 runtime->silence_size > 0) 1004 snd_pcm_playback_silence(substream, ULONG_MAX); 1005 if (substream->timer) 1006 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART, 1007 &runtime->trigger_tstamp); 1008 } 1009 1010 static struct action_ops snd_pcm_action_start = { 1011 .pre_action = snd_pcm_pre_start, 1012 .do_action = snd_pcm_do_start, 1013 .undo_action = snd_pcm_undo_start, 1014 .post_action = snd_pcm_post_start 1015 }; 1016 1017 /** 1018 * snd_pcm_start - start all linked streams 1019 * @substream: the PCM substream instance 1020 * 1021 * Return: Zero if successful, or a negative error code. 1022 */ 1023 int snd_pcm_start(struct snd_pcm_substream *substream) 1024 { 1025 return snd_pcm_action(&snd_pcm_action_start, substream, 1026 SNDRV_PCM_STATE_RUNNING); 1027 } 1028 1029 /* 1030 * stop callbacks 1031 */ 1032 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 1033 { 1034 struct snd_pcm_runtime *runtime = substream->runtime; 1035 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1036 return -EBADFD; 1037 runtime->trigger_master = substream; 1038 return 0; 1039 } 1040 1041 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 1042 { 1043 if (substream->runtime->trigger_master == substream && 1044 snd_pcm_running(substream)) 1045 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1046 return 0; /* unconditonally stop all substreams */ 1047 } 1048 1049 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 1050 { 1051 struct snd_pcm_runtime *runtime = substream->runtime; 1052 if (runtime->status->state != state) { 1053 snd_pcm_trigger_tstamp(substream); 1054 if (substream->timer) 1055 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP, 1056 &runtime->trigger_tstamp); 1057 runtime->status->state = state; 1058 } 1059 wake_up(&runtime->sleep); 1060 wake_up(&runtime->tsleep); 1061 } 1062 1063 static struct action_ops snd_pcm_action_stop = { 1064 .pre_action = snd_pcm_pre_stop, 1065 .do_action = snd_pcm_do_stop, 1066 .post_action = snd_pcm_post_stop 1067 }; 1068 1069 /** 1070 * snd_pcm_stop - try to stop all running streams in the substream group 1071 * @substream: the PCM substream instance 1072 * @state: PCM state after stopping the stream 1073 * 1074 * The state of each stream is then changed to the given state unconditionally. 1075 * 1076 * Return: Zero if successful, or a negative error code. 1077 */ 1078 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1079 { 1080 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1081 } 1082 1083 EXPORT_SYMBOL(snd_pcm_stop); 1084 1085 /** 1086 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1087 * @substream: the PCM substream 1088 * 1089 * After stopping, the state is changed to SETUP. 1090 * Unlike snd_pcm_stop(), this affects only the given stream. 1091 * 1092 * Return: Zero if succesful, or a negative error code. 1093 */ 1094 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1095 { 1096 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1097 SNDRV_PCM_STATE_SETUP); 1098 } 1099 1100 /* 1101 * pause callbacks 1102 */ 1103 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 1104 { 1105 struct snd_pcm_runtime *runtime = substream->runtime; 1106 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1107 return -ENOSYS; 1108 if (push) { 1109 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1110 return -EBADFD; 1111 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1112 return -EBADFD; 1113 runtime->trigger_master = substream; 1114 return 0; 1115 } 1116 1117 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1118 { 1119 if (substream->runtime->trigger_master != substream) 1120 return 0; 1121 /* some drivers might use hw_ptr to recover from the pause - 1122 update the hw_ptr now */ 1123 if (push) 1124 snd_pcm_update_hw_ptr(substream); 1125 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1126 * a delta between the current jiffies, this gives a large enough 1127 * delta, effectively to skip the check once. 1128 */ 1129 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1130 return substream->ops->trigger(substream, 1131 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1132 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1133 } 1134 1135 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1136 { 1137 if (substream->runtime->trigger_master == substream) 1138 substream->ops->trigger(substream, 1139 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1140 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1141 } 1142 1143 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1144 { 1145 struct snd_pcm_runtime *runtime = substream->runtime; 1146 snd_pcm_trigger_tstamp(substream); 1147 if (push) { 1148 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1149 if (substream->timer) 1150 snd_timer_notify(substream->timer, 1151 SNDRV_TIMER_EVENT_MPAUSE, 1152 &runtime->trigger_tstamp); 1153 wake_up(&runtime->sleep); 1154 wake_up(&runtime->tsleep); 1155 } else { 1156 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1157 if (substream->timer) 1158 snd_timer_notify(substream->timer, 1159 SNDRV_TIMER_EVENT_MCONTINUE, 1160 &runtime->trigger_tstamp); 1161 } 1162 } 1163 1164 static struct action_ops snd_pcm_action_pause = { 1165 .pre_action = snd_pcm_pre_pause, 1166 .do_action = snd_pcm_do_pause, 1167 .undo_action = snd_pcm_undo_pause, 1168 .post_action = snd_pcm_post_pause 1169 }; 1170 1171 /* 1172 * Push/release the pause for all linked streams. 1173 */ 1174 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1175 { 1176 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1177 } 1178 1179 #ifdef CONFIG_PM 1180 /* suspend */ 1181 1182 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1183 { 1184 struct snd_pcm_runtime *runtime = substream->runtime; 1185 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1186 return -EBUSY; 1187 runtime->trigger_master = substream; 1188 return 0; 1189 } 1190 1191 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1192 { 1193 struct snd_pcm_runtime *runtime = substream->runtime; 1194 if (runtime->trigger_master != substream) 1195 return 0; 1196 if (! snd_pcm_running(substream)) 1197 return 0; 1198 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1199 return 0; /* suspend unconditionally */ 1200 } 1201 1202 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1203 { 1204 struct snd_pcm_runtime *runtime = substream->runtime; 1205 snd_pcm_trigger_tstamp(substream); 1206 if (substream->timer) 1207 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND, 1208 &runtime->trigger_tstamp); 1209 runtime->status->suspended_state = runtime->status->state; 1210 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1211 wake_up(&runtime->sleep); 1212 wake_up(&runtime->tsleep); 1213 } 1214 1215 static struct action_ops snd_pcm_action_suspend = { 1216 .pre_action = snd_pcm_pre_suspend, 1217 .do_action = snd_pcm_do_suspend, 1218 .post_action = snd_pcm_post_suspend 1219 }; 1220 1221 /** 1222 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1223 * @substream: the PCM substream 1224 * 1225 * After this call, all streams are changed to SUSPENDED state. 1226 * 1227 * Return: Zero if successful (or @substream is %NULL), or a negative error 1228 * code. 1229 */ 1230 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1231 { 1232 int err; 1233 unsigned long flags; 1234 1235 if (! substream) 1236 return 0; 1237 1238 snd_pcm_stream_lock_irqsave(substream, flags); 1239 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1240 snd_pcm_stream_unlock_irqrestore(substream, flags); 1241 return err; 1242 } 1243 1244 EXPORT_SYMBOL(snd_pcm_suspend); 1245 1246 /** 1247 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1248 * @pcm: the PCM instance 1249 * 1250 * After this call, all streams are changed to SUSPENDED state. 1251 * 1252 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1253 */ 1254 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1255 { 1256 struct snd_pcm_substream *substream; 1257 int stream, err = 0; 1258 1259 if (! pcm) 1260 return 0; 1261 1262 for (stream = 0; stream < 2; stream++) { 1263 for (substream = pcm->streams[stream].substream; 1264 substream; substream = substream->next) { 1265 /* FIXME: the open/close code should lock this as well */ 1266 if (substream->runtime == NULL) 1267 continue; 1268 err = snd_pcm_suspend(substream); 1269 if (err < 0 && err != -EBUSY) 1270 return err; 1271 } 1272 } 1273 return 0; 1274 } 1275 1276 EXPORT_SYMBOL(snd_pcm_suspend_all); 1277 1278 /* resume */ 1279 1280 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1281 { 1282 struct snd_pcm_runtime *runtime = substream->runtime; 1283 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1284 return -ENOSYS; 1285 runtime->trigger_master = substream; 1286 return 0; 1287 } 1288 1289 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1290 { 1291 struct snd_pcm_runtime *runtime = substream->runtime; 1292 if (runtime->trigger_master != substream) 1293 return 0; 1294 /* DMA not running previously? */ 1295 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1296 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1297 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1298 return 0; 1299 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1300 } 1301 1302 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1303 { 1304 if (substream->runtime->trigger_master == substream && 1305 snd_pcm_running(substream)) 1306 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1307 } 1308 1309 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1310 { 1311 struct snd_pcm_runtime *runtime = substream->runtime; 1312 snd_pcm_trigger_tstamp(substream); 1313 if (substream->timer) 1314 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME, 1315 &runtime->trigger_tstamp); 1316 runtime->status->state = runtime->status->suspended_state; 1317 } 1318 1319 static struct action_ops snd_pcm_action_resume = { 1320 .pre_action = snd_pcm_pre_resume, 1321 .do_action = snd_pcm_do_resume, 1322 .undo_action = snd_pcm_undo_resume, 1323 .post_action = snd_pcm_post_resume 1324 }; 1325 1326 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1327 { 1328 struct snd_card *card = substream->pcm->card; 1329 int res; 1330 1331 snd_power_lock(card); 1332 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1333 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1334 snd_power_unlock(card); 1335 return res; 1336 } 1337 1338 #else 1339 1340 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1341 { 1342 return -ENOSYS; 1343 } 1344 1345 #endif /* CONFIG_PM */ 1346 1347 /* 1348 * xrun ioctl 1349 * 1350 * Change the RUNNING stream(s) to XRUN state. 1351 */ 1352 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1353 { 1354 struct snd_card *card = substream->pcm->card; 1355 struct snd_pcm_runtime *runtime = substream->runtime; 1356 int result; 1357 1358 snd_power_lock(card); 1359 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1360 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1361 if (result < 0) 1362 goto _unlock; 1363 } 1364 1365 snd_pcm_stream_lock_irq(substream); 1366 switch (runtime->status->state) { 1367 case SNDRV_PCM_STATE_XRUN: 1368 result = 0; /* already there */ 1369 break; 1370 case SNDRV_PCM_STATE_RUNNING: 1371 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1372 break; 1373 default: 1374 result = -EBADFD; 1375 } 1376 snd_pcm_stream_unlock_irq(substream); 1377 _unlock: 1378 snd_power_unlock(card); 1379 return result; 1380 } 1381 1382 /* 1383 * reset ioctl 1384 */ 1385 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1386 { 1387 struct snd_pcm_runtime *runtime = substream->runtime; 1388 switch (runtime->status->state) { 1389 case SNDRV_PCM_STATE_RUNNING: 1390 case SNDRV_PCM_STATE_PREPARED: 1391 case SNDRV_PCM_STATE_PAUSED: 1392 case SNDRV_PCM_STATE_SUSPENDED: 1393 return 0; 1394 default: 1395 return -EBADFD; 1396 } 1397 } 1398 1399 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1400 { 1401 struct snd_pcm_runtime *runtime = substream->runtime; 1402 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1403 if (err < 0) 1404 return err; 1405 runtime->hw_ptr_base = 0; 1406 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1407 runtime->status->hw_ptr % runtime->period_size; 1408 runtime->silence_start = runtime->status->hw_ptr; 1409 runtime->silence_filled = 0; 1410 return 0; 1411 } 1412 1413 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1414 { 1415 struct snd_pcm_runtime *runtime = substream->runtime; 1416 runtime->control->appl_ptr = runtime->status->hw_ptr; 1417 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1418 runtime->silence_size > 0) 1419 snd_pcm_playback_silence(substream, ULONG_MAX); 1420 } 1421 1422 static struct action_ops snd_pcm_action_reset = { 1423 .pre_action = snd_pcm_pre_reset, 1424 .do_action = snd_pcm_do_reset, 1425 .post_action = snd_pcm_post_reset 1426 }; 1427 1428 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1429 { 1430 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1431 } 1432 1433 /* 1434 * prepare ioctl 1435 */ 1436 /* we use the second argument for updating f_flags */ 1437 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1438 int f_flags) 1439 { 1440 struct snd_pcm_runtime *runtime = substream->runtime; 1441 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1442 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1443 return -EBADFD; 1444 if (snd_pcm_running(substream)) 1445 return -EBUSY; 1446 substream->f_flags = f_flags; 1447 return 0; 1448 } 1449 1450 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1451 { 1452 int err; 1453 err = substream->ops->prepare(substream); 1454 if (err < 0) 1455 return err; 1456 return snd_pcm_do_reset(substream, 0); 1457 } 1458 1459 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1460 { 1461 struct snd_pcm_runtime *runtime = substream->runtime; 1462 runtime->control->appl_ptr = runtime->status->hw_ptr; 1463 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1464 } 1465 1466 static struct action_ops snd_pcm_action_prepare = { 1467 .pre_action = snd_pcm_pre_prepare, 1468 .do_action = snd_pcm_do_prepare, 1469 .post_action = snd_pcm_post_prepare 1470 }; 1471 1472 /** 1473 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1474 * @substream: the PCM substream instance 1475 * @file: file to refer f_flags 1476 * 1477 * Return: Zero if successful, or a negative error code. 1478 */ 1479 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1480 struct file *file) 1481 { 1482 int res; 1483 struct snd_card *card = substream->pcm->card; 1484 int f_flags; 1485 1486 if (file) 1487 f_flags = file->f_flags; 1488 else 1489 f_flags = substream->f_flags; 1490 1491 snd_power_lock(card); 1492 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1493 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1494 substream, f_flags); 1495 snd_power_unlock(card); 1496 return res; 1497 } 1498 1499 /* 1500 * drain ioctl 1501 */ 1502 1503 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1504 { 1505 struct snd_pcm_runtime *runtime = substream->runtime; 1506 switch (runtime->status->state) { 1507 case SNDRV_PCM_STATE_OPEN: 1508 case SNDRV_PCM_STATE_DISCONNECTED: 1509 case SNDRV_PCM_STATE_SUSPENDED: 1510 return -EBADFD; 1511 } 1512 runtime->trigger_master = substream; 1513 return 0; 1514 } 1515 1516 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1517 { 1518 struct snd_pcm_runtime *runtime = substream->runtime; 1519 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1520 switch (runtime->status->state) { 1521 case SNDRV_PCM_STATE_PREPARED: 1522 /* start playback stream if possible */ 1523 if (! snd_pcm_playback_empty(substream)) { 1524 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1525 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1526 } 1527 break; 1528 case SNDRV_PCM_STATE_RUNNING: 1529 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1530 break; 1531 case SNDRV_PCM_STATE_XRUN: 1532 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1533 break; 1534 default: 1535 break; 1536 } 1537 } else { 1538 /* stop running stream */ 1539 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1540 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1541 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1542 snd_pcm_do_stop(substream, new_state); 1543 snd_pcm_post_stop(substream, new_state); 1544 } 1545 } 1546 return 0; 1547 } 1548 1549 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1550 { 1551 } 1552 1553 static struct action_ops snd_pcm_action_drain_init = { 1554 .pre_action = snd_pcm_pre_drain_init, 1555 .do_action = snd_pcm_do_drain_init, 1556 .post_action = snd_pcm_post_drain_init 1557 }; 1558 1559 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1560 1561 /* 1562 * Drain the stream(s). 1563 * When the substream is linked, sync until the draining of all playback streams 1564 * is finished. 1565 * After this call, all streams are supposed to be either SETUP or DRAINING 1566 * (capture only) state. 1567 */ 1568 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1569 struct file *file) 1570 { 1571 struct snd_card *card; 1572 struct snd_pcm_runtime *runtime; 1573 struct snd_pcm_substream *s; 1574 wait_queue_t wait; 1575 int result = 0; 1576 int nonblock = 0; 1577 1578 card = substream->pcm->card; 1579 runtime = substream->runtime; 1580 1581 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1582 return -EBADFD; 1583 1584 snd_power_lock(card); 1585 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1586 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1587 if (result < 0) { 1588 snd_power_unlock(card); 1589 return result; 1590 } 1591 } 1592 1593 if (file) { 1594 if (file->f_flags & O_NONBLOCK) 1595 nonblock = 1; 1596 } else if (substream->f_flags & O_NONBLOCK) 1597 nonblock = 1; 1598 1599 down_read(&snd_pcm_link_rwsem); 1600 snd_pcm_stream_lock_irq(substream); 1601 /* resume pause */ 1602 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1603 snd_pcm_pause(substream, 0); 1604 1605 /* pre-start/stop - all running streams are changed to DRAINING state */ 1606 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1607 if (result < 0) 1608 goto unlock; 1609 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1610 if (nonblock) { 1611 result = -EAGAIN; 1612 goto unlock; 1613 } 1614 1615 for (;;) { 1616 long tout; 1617 struct snd_pcm_runtime *to_check; 1618 if (signal_pending(current)) { 1619 result = -ERESTARTSYS; 1620 break; 1621 } 1622 /* find a substream to drain */ 1623 to_check = NULL; 1624 snd_pcm_group_for_each_entry(s, substream) { 1625 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1626 continue; 1627 runtime = s->runtime; 1628 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1629 to_check = runtime; 1630 break; 1631 } 1632 } 1633 if (!to_check) 1634 break; /* all drained */ 1635 init_waitqueue_entry(&wait, current); 1636 add_wait_queue(&to_check->sleep, &wait); 1637 snd_pcm_stream_unlock_irq(substream); 1638 up_read(&snd_pcm_link_rwsem); 1639 snd_power_unlock(card); 1640 if (runtime->no_period_wakeup) 1641 tout = MAX_SCHEDULE_TIMEOUT; 1642 else { 1643 tout = 10; 1644 if (runtime->rate) { 1645 long t = runtime->period_size * 2 / runtime->rate; 1646 tout = max(t, tout); 1647 } 1648 tout = msecs_to_jiffies(tout * 1000); 1649 } 1650 tout = schedule_timeout_interruptible(tout); 1651 snd_power_lock(card); 1652 down_read(&snd_pcm_link_rwsem); 1653 snd_pcm_stream_lock_irq(substream); 1654 remove_wait_queue(&to_check->sleep, &wait); 1655 if (card->shutdown) { 1656 result = -ENODEV; 1657 break; 1658 } 1659 if (tout == 0) { 1660 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1661 result = -ESTRPIPE; 1662 else { 1663 dev_dbg(substream->pcm->card->dev, 1664 "playback drain error (DMA or IRQ trouble?)\n"); 1665 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1666 result = -EIO; 1667 } 1668 break; 1669 } 1670 } 1671 1672 unlock: 1673 snd_pcm_stream_unlock_irq(substream); 1674 up_read(&snd_pcm_link_rwsem); 1675 snd_power_unlock(card); 1676 1677 return result; 1678 } 1679 1680 /* 1681 * drop ioctl 1682 * 1683 * Immediately put all linked substreams into SETUP state. 1684 */ 1685 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1686 { 1687 struct snd_pcm_runtime *runtime; 1688 int result = 0; 1689 1690 if (PCM_RUNTIME_CHECK(substream)) 1691 return -ENXIO; 1692 runtime = substream->runtime; 1693 1694 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1695 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1696 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1697 return -EBADFD; 1698 1699 snd_pcm_stream_lock_irq(substream); 1700 /* resume pause */ 1701 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1702 snd_pcm_pause(substream, 0); 1703 1704 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1705 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1706 snd_pcm_stream_unlock_irq(substream); 1707 1708 return result; 1709 } 1710 1711 1712 static bool is_pcm_file(struct file *file) 1713 { 1714 struct inode *inode = file_inode(file); 1715 unsigned int minor; 1716 1717 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1718 return false; 1719 minor = iminor(inode); 1720 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1721 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1722 } 1723 1724 /* 1725 * PCM link handling 1726 */ 1727 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1728 { 1729 int res = 0; 1730 struct snd_pcm_file *pcm_file; 1731 struct snd_pcm_substream *substream1; 1732 struct snd_pcm_group *group; 1733 struct fd f = fdget(fd); 1734 1735 if (!f.file) 1736 return -EBADFD; 1737 if (!is_pcm_file(f.file)) { 1738 res = -EBADFD; 1739 goto _badf; 1740 } 1741 pcm_file = f.file->private_data; 1742 substream1 = pcm_file->substream; 1743 group = kmalloc(sizeof(*group), GFP_KERNEL); 1744 if (!group) { 1745 res = -ENOMEM; 1746 goto _nolock; 1747 } 1748 down_write(&snd_pcm_link_rwsem); 1749 write_lock_irq(&snd_pcm_link_rwlock); 1750 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1751 substream->runtime->status->state != substream1->runtime->status->state || 1752 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 1753 res = -EBADFD; 1754 goto _end; 1755 } 1756 if (snd_pcm_stream_linked(substream1)) { 1757 res = -EALREADY; 1758 goto _end; 1759 } 1760 if (!snd_pcm_stream_linked(substream)) { 1761 substream->group = group; 1762 group = NULL; 1763 spin_lock_init(&substream->group->lock); 1764 mutex_init(&substream->group->mutex); 1765 INIT_LIST_HEAD(&substream->group->substreams); 1766 list_add_tail(&substream->link_list, &substream->group->substreams); 1767 substream->group->count = 1; 1768 } 1769 list_add_tail(&substream1->link_list, &substream->group->substreams); 1770 substream->group->count++; 1771 substream1->group = substream->group; 1772 _end: 1773 write_unlock_irq(&snd_pcm_link_rwlock); 1774 up_write(&snd_pcm_link_rwsem); 1775 _nolock: 1776 snd_card_unref(substream1->pcm->card); 1777 kfree(group); 1778 _badf: 1779 fdput(f); 1780 return res; 1781 } 1782 1783 static void relink_to_local(struct snd_pcm_substream *substream) 1784 { 1785 substream->group = &substream->self_group; 1786 INIT_LIST_HEAD(&substream->self_group.substreams); 1787 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1788 } 1789 1790 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1791 { 1792 struct snd_pcm_substream *s; 1793 int res = 0; 1794 1795 down_write(&snd_pcm_link_rwsem); 1796 write_lock_irq(&snd_pcm_link_rwlock); 1797 if (!snd_pcm_stream_linked(substream)) { 1798 res = -EALREADY; 1799 goto _end; 1800 } 1801 list_del(&substream->link_list); 1802 substream->group->count--; 1803 if (substream->group->count == 1) { /* detach the last stream, too */ 1804 snd_pcm_group_for_each_entry(s, substream) { 1805 relink_to_local(s); 1806 break; 1807 } 1808 kfree(substream->group); 1809 } 1810 relink_to_local(substream); 1811 _end: 1812 write_unlock_irq(&snd_pcm_link_rwlock); 1813 up_write(&snd_pcm_link_rwsem); 1814 return res; 1815 } 1816 1817 /* 1818 * hw configurator 1819 */ 1820 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1821 struct snd_pcm_hw_rule *rule) 1822 { 1823 struct snd_interval t; 1824 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1825 hw_param_interval_c(params, rule->deps[1]), &t); 1826 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1827 } 1828 1829 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1830 struct snd_pcm_hw_rule *rule) 1831 { 1832 struct snd_interval t; 1833 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1834 hw_param_interval_c(params, rule->deps[1]), &t); 1835 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1836 } 1837 1838 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1839 struct snd_pcm_hw_rule *rule) 1840 { 1841 struct snd_interval t; 1842 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1843 hw_param_interval_c(params, rule->deps[1]), 1844 (unsigned long) rule->private, &t); 1845 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1846 } 1847 1848 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1849 struct snd_pcm_hw_rule *rule) 1850 { 1851 struct snd_interval t; 1852 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1853 (unsigned long) rule->private, 1854 hw_param_interval_c(params, rule->deps[1]), &t); 1855 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1856 } 1857 1858 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1859 struct snd_pcm_hw_rule *rule) 1860 { 1861 unsigned int k; 1862 struct snd_interval *i = hw_param_interval(params, rule->deps[0]); 1863 struct snd_mask m; 1864 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1865 snd_mask_any(&m); 1866 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1867 int bits; 1868 if (! snd_mask_test(mask, k)) 1869 continue; 1870 bits = snd_pcm_format_physical_width(k); 1871 if (bits <= 0) 1872 continue; /* ignore invalid formats */ 1873 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1874 snd_mask_reset(&m, k); 1875 } 1876 return snd_mask_refine(mask, &m); 1877 } 1878 1879 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1880 struct snd_pcm_hw_rule *rule) 1881 { 1882 struct snd_interval t; 1883 unsigned int k; 1884 t.min = UINT_MAX; 1885 t.max = 0; 1886 t.openmin = 0; 1887 t.openmax = 0; 1888 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1889 int bits; 1890 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1891 continue; 1892 bits = snd_pcm_format_physical_width(k); 1893 if (bits <= 0) 1894 continue; /* ignore invalid formats */ 1895 if (t.min > (unsigned)bits) 1896 t.min = bits; 1897 if (t.max < (unsigned)bits) 1898 t.max = bits; 1899 } 1900 t.integer = 1; 1901 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1902 } 1903 1904 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1905 #error "Change this table" 1906 #endif 1907 1908 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1909 48000, 64000, 88200, 96000, 176400, 192000 }; 1910 1911 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1912 .count = ARRAY_SIZE(rates), 1913 .list = rates, 1914 }; 1915 1916 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1917 struct snd_pcm_hw_rule *rule) 1918 { 1919 struct snd_pcm_hardware *hw = rule->private; 1920 return snd_interval_list(hw_param_interval(params, rule->var), 1921 snd_pcm_known_rates.count, 1922 snd_pcm_known_rates.list, hw->rates); 1923 } 1924 1925 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1926 struct snd_pcm_hw_rule *rule) 1927 { 1928 struct snd_interval t; 1929 struct snd_pcm_substream *substream = rule->private; 1930 t.min = 0; 1931 t.max = substream->buffer_bytes_max; 1932 t.openmin = 0; 1933 t.openmax = 0; 1934 t.integer = 1; 1935 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1936 } 1937 1938 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 1939 { 1940 struct snd_pcm_runtime *runtime = substream->runtime; 1941 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1942 int k, err; 1943 1944 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 1945 snd_mask_any(constrs_mask(constrs, k)); 1946 } 1947 1948 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 1949 snd_interval_any(constrs_interval(constrs, k)); 1950 } 1951 1952 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 1953 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 1954 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 1955 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 1956 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 1957 1958 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1959 snd_pcm_hw_rule_format, NULL, 1960 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1961 if (err < 0) 1962 return err; 1963 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1964 snd_pcm_hw_rule_sample_bits, NULL, 1965 SNDRV_PCM_HW_PARAM_FORMAT, 1966 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1967 if (err < 0) 1968 return err; 1969 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1970 snd_pcm_hw_rule_div, NULL, 1971 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1972 if (err < 0) 1973 return err; 1974 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1975 snd_pcm_hw_rule_mul, NULL, 1976 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1977 if (err < 0) 1978 return err; 1979 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1980 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1981 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1982 if (err < 0) 1983 return err; 1984 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1985 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1986 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 1987 if (err < 0) 1988 return err; 1989 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1990 snd_pcm_hw_rule_div, NULL, 1991 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1992 if (err < 0) 1993 return err; 1994 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1995 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1996 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 1997 if (err < 0) 1998 return err; 1999 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2000 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2001 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2002 if (err < 0) 2003 return err; 2004 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2005 snd_pcm_hw_rule_div, NULL, 2006 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2007 if (err < 0) 2008 return err; 2009 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2010 snd_pcm_hw_rule_div, NULL, 2011 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2012 if (err < 0) 2013 return err; 2014 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2015 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2016 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2017 if (err < 0) 2018 return err; 2019 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2020 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2021 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2022 if (err < 0) 2023 return err; 2024 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2025 snd_pcm_hw_rule_mul, NULL, 2026 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2027 if (err < 0) 2028 return err; 2029 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2030 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2031 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2032 if (err < 0) 2033 return err; 2034 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2035 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2036 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2037 if (err < 0) 2038 return err; 2039 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2040 snd_pcm_hw_rule_muldivk, (void*) 8, 2041 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2042 if (err < 0) 2043 return err; 2044 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2045 snd_pcm_hw_rule_muldivk, (void*) 8, 2046 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2047 if (err < 0) 2048 return err; 2049 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2050 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2051 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2052 if (err < 0) 2053 return err; 2054 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2055 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2056 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2057 if (err < 0) 2058 return err; 2059 return 0; 2060 } 2061 2062 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2063 { 2064 struct snd_pcm_runtime *runtime = substream->runtime; 2065 struct snd_pcm_hardware *hw = &runtime->hw; 2066 int err; 2067 unsigned int mask = 0; 2068 2069 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2070 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 2071 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2072 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 2073 if (hw->info & SNDRV_PCM_INFO_MMAP) { 2074 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2075 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 2076 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2077 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 2078 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2079 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 2080 } 2081 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2082 if (err < 0) 2083 return err; 2084 2085 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2086 if (err < 0) 2087 return err; 2088 2089 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 2090 if (err < 0) 2091 return err; 2092 2093 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2094 hw->channels_min, hw->channels_max); 2095 if (err < 0) 2096 return err; 2097 2098 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2099 hw->rate_min, hw->rate_max); 2100 if (err < 0) 2101 return err; 2102 2103 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2104 hw->period_bytes_min, hw->period_bytes_max); 2105 if (err < 0) 2106 return err; 2107 2108 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2109 hw->periods_min, hw->periods_max); 2110 if (err < 0) 2111 return err; 2112 2113 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2114 hw->period_bytes_min, hw->buffer_bytes_max); 2115 if (err < 0) 2116 return err; 2117 2118 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2119 snd_pcm_hw_rule_buffer_bytes_max, substream, 2120 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2121 if (err < 0) 2122 return err; 2123 2124 /* FIXME: remove */ 2125 if (runtime->dma_bytes) { 2126 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2127 if (err < 0) 2128 return err; 2129 } 2130 2131 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2132 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2133 snd_pcm_hw_rule_rate, hw, 2134 SNDRV_PCM_HW_PARAM_RATE, -1); 2135 if (err < 0) 2136 return err; 2137 } 2138 2139 /* FIXME: this belong to lowlevel */ 2140 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2141 2142 return 0; 2143 } 2144 2145 static void pcm_release_private(struct snd_pcm_substream *substream) 2146 { 2147 snd_pcm_unlink(substream); 2148 } 2149 2150 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2151 { 2152 substream->ref_count--; 2153 if (substream->ref_count > 0) 2154 return; 2155 2156 snd_pcm_drop(substream); 2157 if (substream->hw_opened) { 2158 if (substream->ops->hw_free != NULL) 2159 substream->ops->hw_free(substream); 2160 substream->ops->close(substream); 2161 substream->hw_opened = 0; 2162 } 2163 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2164 pm_qos_remove_request(&substream->latency_pm_qos_req); 2165 if (substream->pcm_release) { 2166 substream->pcm_release(substream); 2167 substream->pcm_release = NULL; 2168 } 2169 snd_pcm_detach_substream(substream); 2170 } 2171 2172 EXPORT_SYMBOL(snd_pcm_release_substream); 2173 2174 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2175 struct file *file, 2176 struct snd_pcm_substream **rsubstream) 2177 { 2178 struct snd_pcm_substream *substream; 2179 int err; 2180 2181 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2182 if (err < 0) 2183 return err; 2184 if (substream->ref_count > 1) { 2185 *rsubstream = substream; 2186 return 0; 2187 } 2188 2189 err = snd_pcm_hw_constraints_init(substream); 2190 if (err < 0) { 2191 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2192 goto error; 2193 } 2194 2195 if ((err = substream->ops->open(substream)) < 0) 2196 goto error; 2197 2198 substream->hw_opened = 1; 2199 2200 err = snd_pcm_hw_constraints_complete(substream); 2201 if (err < 0) { 2202 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2203 goto error; 2204 } 2205 2206 *rsubstream = substream; 2207 return 0; 2208 2209 error: 2210 snd_pcm_release_substream(substream); 2211 return err; 2212 } 2213 2214 EXPORT_SYMBOL(snd_pcm_open_substream); 2215 2216 static int snd_pcm_open_file(struct file *file, 2217 struct snd_pcm *pcm, 2218 int stream) 2219 { 2220 struct snd_pcm_file *pcm_file; 2221 struct snd_pcm_substream *substream; 2222 int err; 2223 2224 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2225 if (err < 0) 2226 return err; 2227 2228 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2229 if (pcm_file == NULL) { 2230 snd_pcm_release_substream(substream); 2231 return -ENOMEM; 2232 } 2233 pcm_file->substream = substream; 2234 if (substream->ref_count == 1) { 2235 substream->file = pcm_file; 2236 substream->pcm_release = pcm_release_private; 2237 } 2238 file->private_data = pcm_file; 2239 2240 return 0; 2241 } 2242 2243 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2244 { 2245 struct snd_pcm *pcm; 2246 int err = nonseekable_open(inode, file); 2247 if (err < 0) 2248 return err; 2249 pcm = snd_lookup_minor_data(iminor(inode), 2250 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2251 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2252 if (pcm) 2253 snd_card_unref(pcm->card); 2254 return err; 2255 } 2256 2257 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2258 { 2259 struct snd_pcm *pcm; 2260 int err = nonseekable_open(inode, file); 2261 if (err < 0) 2262 return err; 2263 pcm = snd_lookup_minor_data(iminor(inode), 2264 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2265 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2266 if (pcm) 2267 snd_card_unref(pcm->card); 2268 return err; 2269 } 2270 2271 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2272 { 2273 int err; 2274 wait_queue_t wait; 2275 2276 if (pcm == NULL) { 2277 err = -ENODEV; 2278 goto __error1; 2279 } 2280 err = snd_card_file_add(pcm->card, file); 2281 if (err < 0) 2282 goto __error1; 2283 if (!try_module_get(pcm->card->module)) { 2284 err = -EFAULT; 2285 goto __error2; 2286 } 2287 init_waitqueue_entry(&wait, current); 2288 add_wait_queue(&pcm->open_wait, &wait); 2289 mutex_lock(&pcm->open_mutex); 2290 while (1) { 2291 err = snd_pcm_open_file(file, pcm, stream); 2292 if (err >= 0) 2293 break; 2294 if (err == -EAGAIN) { 2295 if (file->f_flags & O_NONBLOCK) { 2296 err = -EBUSY; 2297 break; 2298 } 2299 } else 2300 break; 2301 set_current_state(TASK_INTERRUPTIBLE); 2302 mutex_unlock(&pcm->open_mutex); 2303 schedule(); 2304 mutex_lock(&pcm->open_mutex); 2305 if (pcm->card->shutdown) { 2306 err = -ENODEV; 2307 break; 2308 } 2309 if (signal_pending(current)) { 2310 err = -ERESTARTSYS; 2311 break; 2312 } 2313 } 2314 remove_wait_queue(&pcm->open_wait, &wait); 2315 mutex_unlock(&pcm->open_mutex); 2316 if (err < 0) 2317 goto __error; 2318 return err; 2319 2320 __error: 2321 module_put(pcm->card->module); 2322 __error2: 2323 snd_card_file_remove(pcm->card, file); 2324 __error1: 2325 return err; 2326 } 2327 2328 static int snd_pcm_release(struct inode *inode, struct file *file) 2329 { 2330 struct snd_pcm *pcm; 2331 struct snd_pcm_substream *substream; 2332 struct snd_pcm_file *pcm_file; 2333 2334 pcm_file = file->private_data; 2335 substream = pcm_file->substream; 2336 if (snd_BUG_ON(!substream)) 2337 return -ENXIO; 2338 pcm = substream->pcm; 2339 mutex_lock(&pcm->open_mutex); 2340 snd_pcm_release_substream(substream); 2341 kfree(pcm_file); 2342 mutex_unlock(&pcm->open_mutex); 2343 wake_up(&pcm->open_wait); 2344 module_put(pcm->card->module); 2345 snd_card_file_remove(pcm->card, file); 2346 return 0; 2347 } 2348 2349 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2350 snd_pcm_uframes_t frames) 2351 { 2352 struct snd_pcm_runtime *runtime = substream->runtime; 2353 snd_pcm_sframes_t appl_ptr; 2354 snd_pcm_sframes_t ret; 2355 snd_pcm_sframes_t hw_avail; 2356 2357 if (frames == 0) 2358 return 0; 2359 2360 snd_pcm_stream_lock_irq(substream); 2361 switch (runtime->status->state) { 2362 case SNDRV_PCM_STATE_PREPARED: 2363 break; 2364 case SNDRV_PCM_STATE_DRAINING: 2365 case SNDRV_PCM_STATE_RUNNING: 2366 if (snd_pcm_update_hw_ptr(substream) >= 0) 2367 break; 2368 /* Fall through */ 2369 case SNDRV_PCM_STATE_XRUN: 2370 ret = -EPIPE; 2371 goto __end; 2372 case SNDRV_PCM_STATE_SUSPENDED: 2373 ret = -ESTRPIPE; 2374 goto __end; 2375 default: 2376 ret = -EBADFD; 2377 goto __end; 2378 } 2379 2380 hw_avail = snd_pcm_playback_hw_avail(runtime); 2381 if (hw_avail <= 0) { 2382 ret = 0; 2383 goto __end; 2384 } 2385 if (frames > (snd_pcm_uframes_t)hw_avail) 2386 frames = hw_avail; 2387 appl_ptr = runtime->control->appl_ptr - frames; 2388 if (appl_ptr < 0) 2389 appl_ptr += runtime->boundary; 2390 runtime->control->appl_ptr = appl_ptr; 2391 ret = frames; 2392 __end: 2393 snd_pcm_stream_unlock_irq(substream); 2394 return ret; 2395 } 2396 2397 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2398 snd_pcm_uframes_t frames) 2399 { 2400 struct snd_pcm_runtime *runtime = substream->runtime; 2401 snd_pcm_sframes_t appl_ptr; 2402 snd_pcm_sframes_t ret; 2403 snd_pcm_sframes_t hw_avail; 2404 2405 if (frames == 0) 2406 return 0; 2407 2408 snd_pcm_stream_lock_irq(substream); 2409 switch (runtime->status->state) { 2410 case SNDRV_PCM_STATE_PREPARED: 2411 case SNDRV_PCM_STATE_DRAINING: 2412 break; 2413 case SNDRV_PCM_STATE_RUNNING: 2414 if (snd_pcm_update_hw_ptr(substream) >= 0) 2415 break; 2416 /* Fall through */ 2417 case SNDRV_PCM_STATE_XRUN: 2418 ret = -EPIPE; 2419 goto __end; 2420 case SNDRV_PCM_STATE_SUSPENDED: 2421 ret = -ESTRPIPE; 2422 goto __end; 2423 default: 2424 ret = -EBADFD; 2425 goto __end; 2426 } 2427 2428 hw_avail = snd_pcm_capture_hw_avail(runtime); 2429 if (hw_avail <= 0) { 2430 ret = 0; 2431 goto __end; 2432 } 2433 if (frames > (snd_pcm_uframes_t)hw_avail) 2434 frames = hw_avail; 2435 appl_ptr = runtime->control->appl_ptr - frames; 2436 if (appl_ptr < 0) 2437 appl_ptr += runtime->boundary; 2438 runtime->control->appl_ptr = appl_ptr; 2439 ret = frames; 2440 __end: 2441 snd_pcm_stream_unlock_irq(substream); 2442 return ret; 2443 } 2444 2445 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2446 snd_pcm_uframes_t frames) 2447 { 2448 struct snd_pcm_runtime *runtime = substream->runtime; 2449 snd_pcm_sframes_t appl_ptr; 2450 snd_pcm_sframes_t ret; 2451 snd_pcm_sframes_t avail; 2452 2453 if (frames == 0) 2454 return 0; 2455 2456 snd_pcm_stream_lock_irq(substream); 2457 switch (runtime->status->state) { 2458 case SNDRV_PCM_STATE_PREPARED: 2459 case SNDRV_PCM_STATE_PAUSED: 2460 break; 2461 case SNDRV_PCM_STATE_DRAINING: 2462 case SNDRV_PCM_STATE_RUNNING: 2463 if (snd_pcm_update_hw_ptr(substream) >= 0) 2464 break; 2465 /* Fall through */ 2466 case SNDRV_PCM_STATE_XRUN: 2467 ret = -EPIPE; 2468 goto __end; 2469 case SNDRV_PCM_STATE_SUSPENDED: 2470 ret = -ESTRPIPE; 2471 goto __end; 2472 default: 2473 ret = -EBADFD; 2474 goto __end; 2475 } 2476 2477 avail = snd_pcm_playback_avail(runtime); 2478 if (avail <= 0) { 2479 ret = 0; 2480 goto __end; 2481 } 2482 if (frames > (snd_pcm_uframes_t)avail) 2483 frames = avail; 2484 appl_ptr = runtime->control->appl_ptr + frames; 2485 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2486 appl_ptr -= runtime->boundary; 2487 runtime->control->appl_ptr = appl_ptr; 2488 ret = frames; 2489 __end: 2490 snd_pcm_stream_unlock_irq(substream); 2491 return ret; 2492 } 2493 2494 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2495 snd_pcm_uframes_t frames) 2496 { 2497 struct snd_pcm_runtime *runtime = substream->runtime; 2498 snd_pcm_sframes_t appl_ptr; 2499 snd_pcm_sframes_t ret; 2500 snd_pcm_sframes_t avail; 2501 2502 if (frames == 0) 2503 return 0; 2504 2505 snd_pcm_stream_lock_irq(substream); 2506 switch (runtime->status->state) { 2507 case SNDRV_PCM_STATE_PREPARED: 2508 case SNDRV_PCM_STATE_DRAINING: 2509 case SNDRV_PCM_STATE_PAUSED: 2510 break; 2511 case SNDRV_PCM_STATE_RUNNING: 2512 if (snd_pcm_update_hw_ptr(substream) >= 0) 2513 break; 2514 /* Fall through */ 2515 case SNDRV_PCM_STATE_XRUN: 2516 ret = -EPIPE; 2517 goto __end; 2518 case SNDRV_PCM_STATE_SUSPENDED: 2519 ret = -ESTRPIPE; 2520 goto __end; 2521 default: 2522 ret = -EBADFD; 2523 goto __end; 2524 } 2525 2526 avail = snd_pcm_capture_avail(runtime); 2527 if (avail <= 0) { 2528 ret = 0; 2529 goto __end; 2530 } 2531 if (frames > (snd_pcm_uframes_t)avail) 2532 frames = avail; 2533 appl_ptr = runtime->control->appl_ptr + frames; 2534 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2535 appl_ptr -= runtime->boundary; 2536 runtime->control->appl_ptr = appl_ptr; 2537 ret = frames; 2538 __end: 2539 snd_pcm_stream_unlock_irq(substream); 2540 return ret; 2541 } 2542 2543 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2544 { 2545 struct snd_pcm_runtime *runtime = substream->runtime; 2546 int err; 2547 2548 snd_pcm_stream_lock_irq(substream); 2549 switch (runtime->status->state) { 2550 case SNDRV_PCM_STATE_DRAINING: 2551 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2552 goto __badfd; 2553 /* Fall through */ 2554 case SNDRV_PCM_STATE_RUNNING: 2555 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2556 break; 2557 /* Fall through */ 2558 case SNDRV_PCM_STATE_PREPARED: 2559 case SNDRV_PCM_STATE_SUSPENDED: 2560 err = 0; 2561 break; 2562 case SNDRV_PCM_STATE_XRUN: 2563 err = -EPIPE; 2564 break; 2565 default: 2566 __badfd: 2567 err = -EBADFD; 2568 break; 2569 } 2570 snd_pcm_stream_unlock_irq(substream); 2571 return err; 2572 } 2573 2574 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2575 snd_pcm_sframes_t __user *res) 2576 { 2577 struct snd_pcm_runtime *runtime = substream->runtime; 2578 int err; 2579 snd_pcm_sframes_t n = 0; 2580 2581 snd_pcm_stream_lock_irq(substream); 2582 switch (runtime->status->state) { 2583 case SNDRV_PCM_STATE_DRAINING: 2584 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2585 goto __badfd; 2586 /* Fall through */ 2587 case SNDRV_PCM_STATE_RUNNING: 2588 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2589 break; 2590 /* Fall through */ 2591 case SNDRV_PCM_STATE_PREPARED: 2592 case SNDRV_PCM_STATE_SUSPENDED: 2593 err = 0; 2594 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2595 n = snd_pcm_playback_hw_avail(runtime); 2596 else 2597 n = snd_pcm_capture_avail(runtime); 2598 n += runtime->delay; 2599 break; 2600 case SNDRV_PCM_STATE_XRUN: 2601 err = -EPIPE; 2602 break; 2603 default: 2604 __badfd: 2605 err = -EBADFD; 2606 break; 2607 } 2608 snd_pcm_stream_unlock_irq(substream); 2609 if (!err) 2610 if (put_user(n, res)) 2611 err = -EFAULT; 2612 return err; 2613 } 2614 2615 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2616 struct snd_pcm_sync_ptr __user *_sync_ptr) 2617 { 2618 struct snd_pcm_runtime *runtime = substream->runtime; 2619 struct snd_pcm_sync_ptr sync_ptr; 2620 volatile struct snd_pcm_mmap_status *status; 2621 volatile struct snd_pcm_mmap_control *control; 2622 int err; 2623 2624 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2625 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2626 return -EFAULT; 2627 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2628 return -EFAULT; 2629 status = runtime->status; 2630 control = runtime->control; 2631 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2632 err = snd_pcm_hwsync(substream); 2633 if (err < 0) 2634 return err; 2635 } 2636 snd_pcm_stream_lock_irq(substream); 2637 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 2638 control->appl_ptr = sync_ptr.c.control.appl_ptr; 2639 else 2640 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2641 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2642 control->avail_min = sync_ptr.c.control.avail_min; 2643 else 2644 sync_ptr.c.control.avail_min = control->avail_min; 2645 sync_ptr.s.status.state = status->state; 2646 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2647 sync_ptr.s.status.tstamp = status->tstamp; 2648 sync_ptr.s.status.suspended_state = status->suspended_state; 2649 snd_pcm_stream_unlock_irq(substream); 2650 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2651 return -EFAULT; 2652 return 0; 2653 } 2654 2655 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2656 { 2657 struct snd_pcm_runtime *runtime = substream->runtime; 2658 int arg; 2659 2660 if (get_user(arg, _arg)) 2661 return -EFAULT; 2662 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2663 return -EINVAL; 2664 runtime->tstamp_type = arg; 2665 return 0; 2666 } 2667 2668 static int snd_pcm_common_ioctl1(struct file *file, 2669 struct snd_pcm_substream *substream, 2670 unsigned int cmd, void __user *arg) 2671 { 2672 switch (cmd) { 2673 case SNDRV_PCM_IOCTL_PVERSION: 2674 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2675 case SNDRV_PCM_IOCTL_INFO: 2676 return snd_pcm_info_user(substream, arg); 2677 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2678 return 0; 2679 case SNDRV_PCM_IOCTL_TTSTAMP: 2680 return snd_pcm_tstamp(substream, arg); 2681 case SNDRV_PCM_IOCTL_HW_REFINE: 2682 return snd_pcm_hw_refine_user(substream, arg); 2683 case SNDRV_PCM_IOCTL_HW_PARAMS: 2684 return snd_pcm_hw_params_user(substream, arg); 2685 case SNDRV_PCM_IOCTL_HW_FREE: 2686 return snd_pcm_hw_free(substream); 2687 case SNDRV_PCM_IOCTL_SW_PARAMS: 2688 return snd_pcm_sw_params_user(substream, arg); 2689 case SNDRV_PCM_IOCTL_STATUS: 2690 return snd_pcm_status_user(substream, arg); 2691 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2692 return snd_pcm_channel_info_user(substream, arg); 2693 case SNDRV_PCM_IOCTL_PREPARE: 2694 return snd_pcm_prepare(substream, file); 2695 case SNDRV_PCM_IOCTL_RESET: 2696 return snd_pcm_reset(substream); 2697 case SNDRV_PCM_IOCTL_START: 2698 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); 2699 case SNDRV_PCM_IOCTL_LINK: 2700 return snd_pcm_link(substream, (int)(unsigned long) arg); 2701 case SNDRV_PCM_IOCTL_UNLINK: 2702 return snd_pcm_unlink(substream); 2703 case SNDRV_PCM_IOCTL_RESUME: 2704 return snd_pcm_resume(substream); 2705 case SNDRV_PCM_IOCTL_XRUN: 2706 return snd_pcm_xrun(substream); 2707 case SNDRV_PCM_IOCTL_HWSYNC: 2708 return snd_pcm_hwsync(substream); 2709 case SNDRV_PCM_IOCTL_DELAY: 2710 return snd_pcm_delay(substream, arg); 2711 case SNDRV_PCM_IOCTL_SYNC_PTR: 2712 return snd_pcm_sync_ptr(substream, arg); 2713 #ifdef CONFIG_SND_SUPPORT_OLD_API 2714 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2715 return snd_pcm_hw_refine_old_user(substream, arg); 2716 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2717 return snd_pcm_hw_params_old_user(substream, arg); 2718 #endif 2719 case SNDRV_PCM_IOCTL_DRAIN: 2720 return snd_pcm_drain(substream, file); 2721 case SNDRV_PCM_IOCTL_DROP: 2722 return snd_pcm_drop(substream); 2723 case SNDRV_PCM_IOCTL_PAUSE: 2724 { 2725 int res; 2726 snd_pcm_stream_lock_irq(substream); 2727 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2728 snd_pcm_stream_unlock_irq(substream); 2729 return res; 2730 } 2731 } 2732 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2733 return -ENOTTY; 2734 } 2735 2736 static int snd_pcm_playback_ioctl1(struct file *file, 2737 struct snd_pcm_substream *substream, 2738 unsigned int cmd, void __user *arg) 2739 { 2740 if (snd_BUG_ON(!substream)) 2741 return -ENXIO; 2742 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2743 return -EINVAL; 2744 switch (cmd) { 2745 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2746 { 2747 struct snd_xferi xferi; 2748 struct snd_xferi __user *_xferi = arg; 2749 struct snd_pcm_runtime *runtime = substream->runtime; 2750 snd_pcm_sframes_t result; 2751 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2752 return -EBADFD; 2753 if (put_user(0, &_xferi->result)) 2754 return -EFAULT; 2755 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2756 return -EFAULT; 2757 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2758 __put_user(result, &_xferi->result); 2759 return result < 0 ? result : 0; 2760 } 2761 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2762 { 2763 struct snd_xfern xfern; 2764 struct snd_xfern __user *_xfern = arg; 2765 struct snd_pcm_runtime *runtime = substream->runtime; 2766 void __user **bufs; 2767 snd_pcm_sframes_t result; 2768 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2769 return -EBADFD; 2770 if (runtime->channels > 128) 2771 return -EINVAL; 2772 if (put_user(0, &_xfern->result)) 2773 return -EFAULT; 2774 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2775 return -EFAULT; 2776 2777 bufs = memdup_user(xfern.bufs, 2778 sizeof(void *) * runtime->channels); 2779 if (IS_ERR(bufs)) 2780 return PTR_ERR(bufs); 2781 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2782 kfree(bufs); 2783 __put_user(result, &_xfern->result); 2784 return result < 0 ? result : 0; 2785 } 2786 case SNDRV_PCM_IOCTL_REWIND: 2787 { 2788 snd_pcm_uframes_t frames; 2789 snd_pcm_uframes_t __user *_frames = arg; 2790 snd_pcm_sframes_t result; 2791 if (get_user(frames, _frames)) 2792 return -EFAULT; 2793 if (put_user(0, _frames)) 2794 return -EFAULT; 2795 result = snd_pcm_playback_rewind(substream, frames); 2796 __put_user(result, _frames); 2797 return result < 0 ? result : 0; 2798 } 2799 case SNDRV_PCM_IOCTL_FORWARD: 2800 { 2801 snd_pcm_uframes_t frames; 2802 snd_pcm_uframes_t __user *_frames = arg; 2803 snd_pcm_sframes_t result; 2804 if (get_user(frames, _frames)) 2805 return -EFAULT; 2806 if (put_user(0, _frames)) 2807 return -EFAULT; 2808 result = snd_pcm_playback_forward(substream, frames); 2809 __put_user(result, _frames); 2810 return result < 0 ? result : 0; 2811 } 2812 } 2813 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2814 } 2815 2816 static int snd_pcm_capture_ioctl1(struct file *file, 2817 struct snd_pcm_substream *substream, 2818 unsigned int cmd, void __user *arg) 2819 { 2820 if (snd_BUG_ON(!substream)) 2821 return -ENXIO; 2822 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2823 return -EINVAL; 2824 switch (cmd) { 2825 case SNDRV_PCM_IOCTL_READI_FRAMES: 2826 { 2827 struct snd_xferi xferi; 2828 struct snd_xferi __user *_xferi = arg; 2829 struct snd_pcm_runtime *runtime = substream->runtime; 2830 snd_pcm_sframes_t result; 2831 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2832 return -EBADFD; 2833 if (put_user(0, &_xferi->result)) 2834 return -EFAULT; 2835 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2836 return -EFAULT; 2837 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2838 __put_user(result, &_xferi->result); 2839 return result < 0 ? result : 0; 2840 } 2841 case SNDRV_PCM_IOCTL_READN_FRAMES: 2842 { 2843 struct snd_xfern xfern; 2844 struct snd_xfern __user *_xfern = arg; 2845 struct snd_pcm_runtime *runtime = substream->runtime; 2846 void *bufs; 2847 snd_pcm_sframes_t result; 2848 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2849 return -EBADFD; 2850 if (runtime->channels > 128) 2851 return -EINVAL; 2852 if (put_user(0, &_xfern->result)) 2853 return -EFAULT; 2854 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2855 return -EFAULT; 2856 2857 bufs = memdup_user(xfern.bufs, 2858 sizeof(void *) * runtime->channels); 2859 if (IS_ERR(bufs)) 2860 return PTR_ERR(bufs); 2861 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2862 kfree(bufs); 2863 __put_user(result, &_xfern->result); 2864 return result < 0 ? result : 0; 2865 } 2866 case SNDRV_PCM_IOCTL_REWIND: 2867 { 2868 snd_pcm_uframes_t frames; 2869 snd_pcm_uframes_t __user *_frames = arg; 2870 snd_pcm_sframes_t result; 2871 if (get_user(frames, _frames)) 2872 return -EFAULT; 2873 if (put_user(0, _frames)) 2874 return -EFAULT; 2875 result = snd_pcm_capture_rewind(substream, frames); 2876 __put_user(result, _frames); 2877 return result < 0 ? result : 0; 2878 } 2879 case SNDRV_PCM_IOCTL_FORWARD: 2880 { 2881 snd_pcm_uframes_t frames; 2882 snd_pcm_uframes_t __user *_frames = arg; 2883 snd_pcm_sframes_t result; 2884 if (get_user(frames, _frames)) 2885 return -EFAULT; 2886 if (put_user(0, _frames)) 2887 return -EFAULT; 2888 result = snd_pcm_capture_forward(substream, frames); 2889 __put_user(result, _frames); 2890 return result < 0 ? result : 0; 2891 } 2892 } 2893 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2894 } 2895 2896 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2897 unsigned long arg) 2898 { 2899 struct snd_pcm_file *pcm_file; 2900 2901 pcm_file = file->private_data; 2902 2903 if (((cmd >> 8) & 0xff) != 'A') 2904 return -ENOTTY; 2905 2906 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2907 (void __user *)arg); 2908 } 2909 2910 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2911 unsigned long arg) 2912 { 2913 struct snd_pcm_file *pcm_file; 2914 2915 pcm_file = file->private_data; 2916 2917 if (((cmd >> 8) & 0xff) != 'A') 2918 return -ENOTTY; 2919 2920 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2921 (void __user *)arg); 2922 } 2923 2924 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2925 unsigned int cmd, void *arg) 2926 { 2927 mm_segment_t fs; 2928 int result; 2929 2930 fs = snd_enter_user(); 2931 switch (substream->stream) { 2932 case SNDRV_PCM_STREAM_PLAYBACK: 2933 result = snd_pcm_playback_ioctl1(NULL, substream, cmd, 2934 (void __user *)arg); 2935 break; 2936 case SNDRV_PCM_STREAM_CAPTURE: 2937 result = snd_pcm_capture_ioctl1(NULL, substream, cmd, 2938 (void __user *)arg); 2939 break; 2940 default: 2941 result = -EINVAL; 2942 break; 2943 } 2944 snd_leave_user(fs); 2945 return result; 2946 } 2947 2948 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2949 2950 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2951 loff_t * offset) 2952 { 2953 struct snd_pcm_file *pcm_file; 2954 struct snd_pcm_substream *substream; 2955 struct snd_pcm_runtime *runtime; 2956 snd_pcm_sframes_t result; 2957 2958 pcm_file = file->private_data; 2959 substream = pcm_file->substream; 2960 if (PCM_RUNTIME_CHECK(substream)) 2961 return -ENXIO; 2962 runtime = substream->runtime; 2963 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2964 return -EBADFD; 2965 if (!frame_aligned(runtime, count)) 2966 return -EINVAL; 2967 count = bytes_to_frames(runtime, count); 2968 result = snd_pcm_lib_read(substream, buf, count); 2969 if (result > 0) 2970 result = frames_to_bytes(runtime, result); 2971 return result; 2972 } 2973 2974 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 2975 size_t count, loff_t * offset) 2976 { 2977 struct snd_pcm_file *pcm_file; 2978 struct snd_pcm_substream *substream; 2979 struct snd_pcm_runtime *runtime; 2980 snd_pcm_sframes_t result; 2981 2982 pcm_file = file->private_data; 2983 substream = pcm_file->substream; 2984 if (PCM_RUNTIME_CHECK(substream)) 2985 return -ENXIO; 2986 runtime = substream->runtime; 2987 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2988 return -EBADFD; 2989 if (!frame_aligned(runtime, count)) 2990 return -EINVAL; 2991 count = bytes_to_frames(runtime, count); 2992 result = snd_pcm_lib_write(substream, buf, count); 2993 if (result > 0) 2994 result = frames_to_bytes(runtime, result); 2995 return result; 2996 } 2997 2998 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov, 2999 unsigned long nr_segs, loff_t pos) 3000 3001 { 3002 struct snd_pcm_file *pcm_file; 3003 struct snd_pcm_substream *substream; 3004 struct snd_pcm_runtime *runtime; 3005 snd_pcm_sframes_t result; 3006 unsigned long i; 3007 void __user **bufs; 3008 snd_pcm_uframes_t frames; 3009 3010 pcm_file = iocb->ki_filp->private_data; 3011 substream = pcm_file->substream; 3012 if (PCM_RUNTIME_CHECK(substream)) 3013 return -ENXIO; 3014 runtime = substream->runtime; 3015 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3016 return -EBADFD; 3017 if (nr_segs > 1024 || nr_segs != runtime->channels) 3018 return -EINVAL; 3019 if (!frame_aligned(runtime, iov->iov_len)) 3020 return -EINVAL; 3021 frames = bytes_to_samples(runtime, iov->iov_len); 3022 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 3023 if (bufs == NULL) 3024 return -ENOMEM; 3025 for (i = 0; i < nr_segs; ++i) 3026 bufs[i] = iov[i].iov_base; 3027 result = snd_pcm_lib_readv(substream, bufs, frames); 3028 if (result > 0) 3029 result = frames_to_bytes(runtime, result); 3030 kfree(bufs); 3031 return result; 3032 } 3033 3034 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov, 3035 unsigned long nr_segs, loff_t pos) 3036 { 3037 struct snd_pcm_file *pcm_file; 3038 struct snd_pcm_substream *substream; 3039 struct snd_pcm_runtime *runtime; 3040 snd_pcm_sframes_t result; 3041 unsigned long i; 3042 void __user **bufs; 3043 snd_pcm_uframes_t frames; 3044 3045 pcm_file = iocb->ki_filp->private_data; 3046 substream = pcm_file->substream; 3047 if (PCM_RUNTIME_CHECK(substream)) 3048 return -ENXIO; 3049 runtime = substream->runtime; 3050 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3051 return -EBADFD; 3052 if (nr_segs > 128 || nr_segs != runtime->channels || 3053 !frame_aligned(runtime, iov->iov_len)) 3054 return -EINVAL; 3055 frames = bytes_to_samples(runtime, iov->iov_len); 3056 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 3057 if (bufs == NULL) 3058 return -ENOMEM; 3059 for (i = 0; i < nr_segs; ++i) 3060 bufs[i] = iov[i].iov_base; 3061 result = snd_pcm_lib_writev(substream, bufs, frames); 3062 if (result > 0) 3063 result = frames_to_bytes(runtime, result); 3064 kfree(bufs); 3065 return result; 3066 } 3067 3068 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 3069 { 3070 struct snd_pcm_file *pcm_file; 3071 struct snd_pcm_substream *substream; 3072 struct snd_pcm_runtime *runtime; 3073 unsigned int mask; 3074 snd_pcm_uframes_t avail; 3075 3076 pcm_file = file->private_data; 3077 3078 substream = pcm_file->substream; 3079 if (PCM_RUNTIME_CHECK(substream)) 3080 return -ENXIO; 3081 runtime = substream->runtime; 3082 3083 poll_wait(file, &runtime->sleep, wait); 3084 3085 snd_pcm_stream_lock_irq(substream); 3086 avail = snd_pcm_playback_avail(runtime); 3087 switch (runtime->status->state) { 3088 case SNDRV_PCM_STATE_RUNNING: 3089 case SNDRV_PCM_STATE_PREPARED: 3090 case SNDRV_PCM_STATE_PAUSED: 3091 if (avail >= runtime->control->avail_min) { 3092 mask = POLLOUT | POLLWRNORM; 3093 break; 3094 } 3095 /* Fall through */ 3096 case SNDRV_PCM_STATE_DRAINING: 3097 mask = 0; 3098 break; 3099 default: 3100 mask = POLLOUT | POLLWRNORM | POLLERR; 3101 break; 3102 } 3103 snd_pcm_stream_unlock_irq(substream); 3104 return mask; 3105 } 3106 3107 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 3108 { 3109 struct snd_pcm_file *pcm_file; 3110 struct snd_pcm_substream *substream; 3111 struct snd_pcm_runtime *runtime; 3112 unsigned int mask; 3113 snd_pcm_uframes_t avail; 3114 3115 pcm_file = file->private_data; 3116 3117 substream = pcm_file->substream; 3118 if (PCM_RUNTIME_CHECK(substream)) 3119 return -ENXIO; 3120 runtime = substream->runtime; 3121 3122 poll_wait(file, &runtime->sleep, wait); 3123 3124 snd_pcm_stream_lock_irq(substream); 3125 avail = snd_pcm_capture_avail(runtime); 3126 switch (runtime->status->state) { 3127 case SNDRV_PCM_STATE_RUNNING: 3128 case SNDRV_PCM_STATE_PREPARED: 3129 case SNDRV_PCM_STATE_PAUSED: 3130 if (avail >= runtime->control->avail_min) { 3131 mask = POLLIN | POLLRDNORM; 3132 break; 3133 } 3134 mask = 0; 3135 break; 3136 case SNDRV_PCM_STATE_DRAINING: 3137 if (avail > 0) { 3138 mask = POLLIN | POLLRDNORM; 3139 break; 3140 } 3141 /* Fall through */ 3142 default: 3143 mask = POLLIN | POLLRDNORM | POLLERR; 3144 break; 3145 } 3146 snd_pcm_stream_unlock_irq(substream); 3147 return mask; 3148 } 3149 3150 /* 3151 * mmap support 3152 */ 3153 3154 /* 3155 * Only on coherent architectures, we can mmap the status and the control records 3156 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3157 */ 3158 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3159 /* 3160 * mmap status record 3161 */ 3162 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area, 3163 struct vm_fault *vmf) 3164 { 3165 struct snd_pcm_substream *substream = area->vm_private_data; 3166 struct snd_pcm_runtime *runtime; 3167 3168 if (substream == NULL) 3169 return VM_FAULT_SIGBUS; 3170 runtime = substream->runtime; 3171 vmf->page = virt_to_page(runtime->status); 3172 get_page(vmf->page); 3173 return 0; 3174 } 3175 3176 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3177 { 3178 .fault = snd_pcm_mmap_status_fault, 3179 }; 3180 3181 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3182 struct vm_area_struct *area) 3183 { 3184 long size; 3185 if (!(area->vm_flags & VM_READ)) 3186 return -EINVAL; 3187 size = area->vm_end - area->vm_start; 3188 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3189 return -EINVAL; 3190 area->vm_ops = &snd_pcm_vm_ops_status; 3191 area->vm_private_data = substream; 3192 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3193 return 0; 3194 } 3195 3196 /* 3197 * mmap control record 3198 */ 3199 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area, 3200 struct vm_fault *vmf) 3201 { 3202 struct snd_pcm_substream *substream = area->vm_private_data; 3203 struct snd_pcm_runtime *runtime; 3204 3205 if (substream == NULL) 3206 return VM_FAULT_SIGBUS; 3207 runtime = substream->runtime; 3208 vmf->page = virt_to_page(runtime->control); 3209 get_page(vmf->page); 3210 return 0; 3211 } 3212 3213 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3214 { 3215 .fault = snd_pcm_mmap_control_fault, 3216 }; 3217 3218 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3219 struct vm_area_struct *area) 3220 { 3221 long size; 3222 if (!(area->vm_flags & VM_READ)) 3223 return -EINVAL; 3224 size = area->vm_end - area->vm_start; 3225 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3226 return -EINVAL; 3227 area->vm_ops = &snd_pcm_vm_ops_control; 3228 area->vm_private_data = substream; 3229 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3230 return 0; 3231 } 3232 #else /* ! coherent mmap */ 3233 /* 3234 * don't support mmap for status and control records. 3235 */ 3236 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3237 struct vm_area_struct *area) 3238 { 3239 return -ENXIO; 3240 } 3241 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3242 struct vm_area_struct *area) 3243 { 3244 return -ENXIO; 3245 } 3246 #endif /* coherent mmap */ 3247 3248 static inline struct page * 3249 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3250 { 3251 void *vaddr = substream->runtime->dma_area + ofs; 3252 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3253 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3254 return virt_to_page(CAC_ADDR(vaddr)); 3255 #endif 3256 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE) 3257 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) { 3258 dma_addr_t addr = substream->runtime->dma_addr + ofs; 3259 addr -= get_dma_offset(substream->dma_buffer.dev.dev); 3260 /* assume dma_handle set via pfn_to_phys() in 3261 * mm/dma-noncoherent.c 3262 */ 3263 return pfn_to_page(addr >> PAGE_SHIFT); 3264 } 3265 #endif 3266 return virt_to_page(vaddr); 3267 } 3268 3269 /* 3270 * fault callback for mmapping a RAM page 3271 */ 3272 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area, 3273 struct vm_fault *vmf) 3274 { 3275 struct snd_pcm_substream *substream = area->vm_private_data; 3276 struct snd_pcm_runtime *runtime; 3277 unsigned long offset; 3278 struct page * page; 3279 size_t dma_bytes; 3280 3281 if (substream == NULL) 3282 return VM_FAULT_SIGBUS; 3283 runtime = substream->runtime; 3284 offset = vmf->pgoff << PAGE_SHIFT; 3285 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3286 if (offset > dma_bytes - PAGE_SIZE) 3287 return VM_FAULT_SIGBUS; 3288 if (substream->ops->page) 3289 page = substream->ops->page(substream, offset); 3290 else 3291 page = snd_pcm_default_page_ops(substream, offset); 3292 if (!page) 3293 return VM_FAULT_SIGBUS; 3294 get_page(page); 3295 vmf->page = page; 3296 return 0; 3297 } 3298 3299 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3300 .open = snd_pcm_mmap_data_open, 3301 .close = snd_pcm_mmap_data_close, 3302 }; 3303 3304 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3305 .open = snd_pcm_mmap_data_open, 3306 .close = snd_pcm_mmap_data_close, 3307 .fault = snd_pcm_mmap_data_fault, 3308 }; 3309 3310 #ifndef ARCH_HAS_DMA_MMAP_COHERENT 3311 /* This should be defined / handled globally! */ 3312 #if defined(CONFIG_ARM) || defined(CONFIG_ARM64) 3313 #define ARCH_HAS_DMA_MMAP_COHERENT 3314 #endif 3315 #endif 3316 3317 /* 3318 * mmap the DMA buffer on RAM 3319 */ 3320 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3321 struct vm_area_struct *area) 3322 { 3323 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3324 #ifdef CONFIG_GENERIC_ALLOCATOR 3325 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3326 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3327 return remap_pfn_range(area, area->vm_start, 3328 substream->dma_buffer.addr >> PAGE_SHIFT, 3329 area->vm_end - area->vm_start, area->vm_page_prot); 3330 } 3331 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3332 #ifdef ARCH_HAS_DMA_MMAP_COHERENT 3333 if (!substream->ops->page && 3334 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3335 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3336 area, 3337 substream->runtime->dma_area, 3338 substream->runtime->dma_addr, 3339 area->vm_end - area->vm_start); 3340 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3341 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV && 3342 !plat_device_is_coherent(substream->dma_buffer.dev.dev)) 3343 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3344 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */ 3345 /* mmap with fault handler */ 3346 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3347 return 0; 3348 } 3349 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3350 3351 /* 3352 * mmap the DMA buffer on I/O memory area 3353 */ 3354 #if SNDRV_PCM_INFO_MMAP_IOMEM 3355 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3356 struct vm_area_struct *area) 3357 { 3358 struct snd_pcm_runtime *runtime = substream->runtime;; 3359 3360 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3361 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3362 } 3363 3364 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3365 #endif /* SNDRV_PCM_INFO_MMAP */ 3366 3367 /* 3368 * mmap DMA buffer 3369 */ 3370 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3371 struct vm_area_struct *area) 3372 { 3373 struct snd_pcm_runtime *runtime; 3374 long size; 3375 unsigned long offset; 3376 size_t dma_bytes; 3377 int err; 3378 3379 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3380 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3381 return -EINVAL; 3382 } else { 3383 if (!(area->vm_flags & VM_READ)) 3384 return -EINVAL; 3385 } 3386 runtime = substream->runtime; 3387 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3388 return -EBADFD; 3389 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3390 return -ENXIO; 3391 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3392 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3393 return -EINVAL; 3394 size = area->vm_end - area->vm_start; 3395 offset = area->vm_pgoff << PAGE_SHIFT; 3396 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3397 if ((size_t)size > dma_bytes) 3398 return -EINVAL; 3399 if (offset > dma_bytes - size) 3400 return -EINVAL; 3401 3402 area->vm_ops = &snd_pcm_vm_ops_data; 3403 area->vm_private_data = substream; 3404 if (substream->ops->mmap) 3405 err = substream->ops->mmap(substream, area); 3406 else 3407 err = snd_pcm_lib_default_mmap(substream, area); 3408 if (!err) 3409 atomic_inc(&substream->mmap_count); 3410 return err; 3411 } 3412 3413 EXPORT_SYMBOL(snd_pcm_mmap_data); 3414 3415 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3416 { 3417 struct snd_pcm_file * pcm_file; 3418 struct snd_pcm_substream *substream; 3419 unsigned long offset; 3420 3421 pcm_file = file->private_data; 3422 substream = pcm_file->substream; 3423 if (PCM_RUNTIME_CHECK(substream)) 3424 return -ENXIO; 3425 3426 offset = area->vm_pgoff << PAGE_SHIFT; 3427 switch (offset) { 3428 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3429 if (pcm_file->no_compat_mmap) 3430 return -ENXIO; 3431 return snd_pcm_mmap_status(substream, file, area); 3432 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3433 if (pcm_file->no_compat_mmap) 3434 return -ENXIO; 3435 return snd_pcm_mmap_control(substream, file, area); 3436 default: 3437 return snd_pcm_mmap_data(substream, file, area); 3438 } 3439 return 0; 3440 } 3441 3442 static int snd_pcm_fasync(int fd, struct file * file, int on) 3443 { 3444 struct snd_pcm_file * pcm_file; 3445 struct snd_pcm_substream *substream; 3446 struct snd_pcm_runtime *runtime; 3447 3448 pcm_file = file->private_data; 3449 substream = pcm_file->substream; 3450 if (PCM_RUNTIME_CHECK(substream)) 3451 return -ENXIO; 3452 runtime = substream->runtime; 3453 return fasync_helper(fd, file, on, &runtime->fasync); 3454 } 3455 3456 /* 3457 * ioctl32 compat 3458 */ 3459 #ifdef CONFIG_COMPAT 3460 #include "pcm_compat.c" 3461 #else 3462 #define snd_pcm_ioctl_compat NULL 3463 #endif 3464 3465 /* 3466 * To be removed helpers to keep binary compatibility 3467 */ 3468 3469 #ifdef CONFIG_SND_SUPPORT_OLD_API 3470 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3471 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3472 3473 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3474 struct snd_pcm_hw_params_old *oparams) 3475 { 3476 unsigned int i; 3477 3478 memset(params, 0, sizeof(*params)); 3479 params->flags = oparams->flags; 3480 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3481 params->masks[i].bits[0] = oparams->masks[i]; 3482 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3483 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3484 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3485 params->info = oparams->info; 3486 params->msbits = oparams->msbits; 3487 params->rate_num = oparams->rate_num; 3488 params->rate_den = oparams->rate_den; 3489 params->fifo_size = oparams->fifo_size; 3490 } 3491 3492 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3493 struct snd_pcm_hw_params *params) 3494 { 3495 unsigned int i; 3496 3497 memset(oparams, 0, sizeof(*oparams)); 3498 oparams->flags = params->flags; 3499 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3500 oparams->masks[i] = params->masks[i].bits[0]; 3501 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3502 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3503 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3504 oparams->info = params->info; 3505 oparams->msbits = params->msbits; 3506 oparams->rate_num = params->rate_num; 3507 oparams->rate_den = params->rate_den; 3508 oparams->fifo_size = params->fifo_size; 3509 } 3510 3511 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3512 struct snd_pcm_hw_params_old __user * _oparams) 3513 { 3514 struct snd_pcm_hw_params *params; 3515 struct snd_pcm_hw_params_old *oparams = NULL; 3516 int err; 3517 3518 params = kmalloc(sizeof(*params), GFP_KERNEL); 3519 if (!params) 3520 return -ENOMEM; 3521 3522 oparams = memdup_user(_oparams, sizeof(*oparams)); 3523 if (IS_ERR(oparams)) { 3524 err = PTR_ERR(oparams); 3525 goto out; 3526 } 3527 snd_pcm_hw_convert_from_old_params(params, oparams); 3528 err = snd_pcm_hw_refine(substream, params); 3529 snd_pcm_hw_convert_to_old_params(oparams, params); 3530 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3531 if (!err) 3532 err = -EFAULT; 3533 } 3534 3535 kfree(oparams); 3536 out: 3537 kfree(params); 3538 return err; 3539 } 3540 3541 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3542 struct snd_pcm_hw_params_old __user * _oparams) 3543 { 3544 struct snd_pcm_hw_params *params; 3545 struct snd_pcm_hw_params_old *oparams = NULL; 3546 int err; 3547 3548 params = kmalloc(sizeof(*params), GFP_KERNEL); 3549 if (!params) 3550 return -ENOMEM; 3551 3552 oparams = memdup_user(_oparams, sizeof(*oparams)); 3553 if (IS_ERR(oparams)) { 3554 err = PTR_ERR(oparams); 3555 goto out; 3556 } 3557 snd_pcm_hw_convert_from_old_params(params, oparams); 3558 err = snd_pcm_hw_params(substream, params); 3559 snd_pcm_hw_convert_to_old_params(oparams, params); 3560 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3561 if (!err) 3562 err = -EFAULT; 3563 } 3564 3565 kfree(oparams); 3566 out: 3567 kfree(params); 3568 return err; 3569 } 3570 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3571 3572 #ifndef CONFIG_MMU 3573 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3574 unsigned long addr, 3575 unsigned long len, 3576 unsigned long pgoff, 3577 unsigned long flags) 3578 { 3579 struct snd_pcm_file *pcm_file = file->private_data; 3580 struct snd_pcm_substream *substream = pcm_file->substream; 3581 struct snd_pcm_runtime *runtime = substream->runtime; 3582 unsigned long offset = pgoff << PAGE_SHIFT; 3583 3584 switch (offset) { 3585 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3586 return (unsigned long)runtime->status; 3587 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3588 return (unsigned long)runtime->control; 3589 default: 3590 return (unsigned long)runtime->dma_area + offset; 3591 } 3592 } 3593 #else 3594 # define snd_pcm_get_unmapped_area NULL 3595 #endif 3596 3597 /* 3598 * Register section 3599 */ 3600 3601 const struct file_operations snd_pcm_f_ops[2] = { 3602 { 3603 .owner = THIS_MODULE, 3604 .write = snd_pcm_write, 3605 .aio_write = snd_pcm_aio_write, 3606 .open = snd_pcm_playback_open, 3607 .release = snd_pcm_release, 3608 .llseek = no_llseek, 3609 .poll = snd_pcm_playback_poll, 3610 .unlocked_ioctl = snd_pcm_playback_ioctl, 3611 .compat_ioctl = snd_pcm_ioctl_compat, 3612 .mmap = snd_pcm_mmap, 3613 .fasync = snd_pcm_fasync, 3614 .get_unmapped_area = snd_pcm_get_unmapped_area, 3615 }, 3616 { 3617 .owner = THIS_MODULE, 3618 .read = snd_pcm_read, 3619 .aio_read = snd_pcm_aio_read, 3620 .open = snd_pcm_capture_open, 3621 .release = snd_pcm_release, 3622 .llseek = no_llseek, 3623 .poll = snd_pcm_capture_poll, 3624 .unlocked_ioctl = snd_pcm_capture_ioctl, 3625 .compat_ioctl = snd_pcm_ioctl_compat, 3626 .mmap = snd_pcm_mmap, 3627 .fasync = snd_pcm_fasync, 3628 .get_unmapped_area = snd_pcm_get_unmapped_area, 3629 } 3630 }; 3631