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