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