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