1 /* 2 * Timers abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/delay.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/time.h> 26 #include <linux/mutex.h> 27 #include <linux/moduleparam.h> 28 #include <linux/string.h> 29 #include <sound/core.h> 30 #include <sound/timer.h> 31 #include <sound/control.h> 32 #include <sound/info.h> 33 #include <sound/minors.h> 34 #include <sound/initval.h> 35 #include <linux/kmod.h> 36 37 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE) 38 #define DEFAULT_TIMER_LIMIT 3 39 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE) 40 #define DEFAULT_TIMER_LIMIT 2 41 #else 42 #define DEFAULT_TIMER_LIMIT 1 43 #endif 44 45 static int timer_limit = DEFAULT_TIMER_LIMIT; 46 static int timer_tstamp_monotonic = 1; 47 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); 48 MODULE_DESCRIPTION("ALSA timer interface"); 49 MODULE_LICENSE("GPL"); 50 module_param(timer_limit, int, 0444); 51 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 52 module_param(timer_tstamp_monotonic, int, 0444); 53 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); 54 55 struct snd_timer_user { 56 struct snd_timer_instance *timeri; 57 int tread; /* enhanced read with timestamps and events */ 58 unsigned long ticks; 59 unsigned long overrun; 60 int qhead; 61 int qtail; 62 int qused; 63 int queue_size; 64 struct snd_timer_read *queue; 65 struct snd_timer_tread *tqueue; 66 spinlock_t qlock; 67 unsigned long last_resolution; 68 unsigned int filter; 69 struct timespec tstamp; /* trigger tstamp */ 70 wait_queue_head_t qchange_sleep; 71 struct fasync_struct *fasync; 72 struct mutex tread_sem; 73 }; 74 75 /* list of timers */ 76 static LIST_HEAD(snd_timer_list); 77 78 /* list of slave instances */ 79 static LIST_HEAD(snd_timer_slave_list); 80 81 /* lock for slave active lists */ 82 static DEFINE_SPINLOCK(slave_active_lock); 83 84 static DEFINE_MUTEX(register_mutex); 85 86 static int snd_timer_free(struct snd_timer *timer); 87 static int snd_timer_dev_free(struct snd_device *device); 88 static int snd_timer_dev_register(struct snd_device *device); 89 static int snd_timer_dev_disconnect(struct snd_device *device); 90 91 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 92 93 /* 94 * create a timer instance with the given owner string. 95 * when timer is not NULL, increments the module counter 96 */ 97 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 98 struct snd_timer *timer) 99 { 100 struct snd_timer_instance *timeri; 101 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 102 if (timeri == NULL) 103 return NULL; 104 timeri->owner = kstrdup(owner, GFP_KERNEL); 105 if (! timeri->owner) { 106 kfree(timeri); 107 return NULL; 108 } 109 INIT_LIST_HEAD(&timeri->open_list); 110 INIT_LIST_HEAD(&timeri->active_list); 111 INIT_LIST_HEAD(&timeri->ack_list); 112 INIT_LIST_HEAD(&timeri->slave_list_head); 113 INIT_LIST_HEAD(&timeri->slave_active_head); 114 115 timeri->timer = timer; 116 if (timer && !try_module_get(timer->module)) { 117 kfree(timeri->owner); 118 kfree(timeri); 119 return NULL; 120 } 121 122 return timeri; 123 } 124 125 /* 126 * find a timer instance from the given timer id 127 */ 128 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 129 { 130 struct snd_timer *timer = NULL; 131 132 list_for_each_entry(timer, &snd_timer_list, device_list) { 133 if (timer->tmr_class != tid->dev_class) 134 continue; 135 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 136 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 137 (timer->card == NULL || 138 timer->card->number != tid->card)) 139 continue; 140 if (timer->tmr_device != tid->device) 141 continue; 142 if (timer->tmr_subdevice != tid->subdevice) 143 continue; 144 return timer; 145 } 146 return NULL; 147 } 148 149 #ifdef CONFIG_MODULES 150 151 static void snd_timer_request(struct snd_timer_id *tid) 152 { 153 switch (tid->dev_class) { 154 case SNDRV_TIMER_CLASS_GLOBAL: 155 if (tid->device < timer_limit) 156 request_module("snd-timer-%i", tid->device); 157 break; 158 case SNDRV_TIMER_CLASS_CARD: 159 case SNDRV_TIMER_CLASS_PCM: 160 if (tid->card < snd_ecards_limit) 161 request_module("snd-card-%i", tid->card); 162 break; 163 default: 164 break; 165 } 166 } 167 168 #endif 169 170 /* 171 * look for a master instance matching with the slave id of the given slave. 172 * when found, relink the open_link of the slave. 173 * 174 * call this with register_mutex down. 175 */ 176 static void snd_timer_check_slave(struct snd_timer_instance *slave) 177 { 178 struct snd_timer *timer; 179 struct snd_timer_instance *master; 180 181 /* FIXME: it's really dumb to look up all entries.. */ 182 list_for_each_entry(timer, &snd_timer_list, device_list) { 183 list_for_each_entry(master, &timer->open_list_head, open_list) { 184 if (slave->slave_class == master->slave_class && 185 slave->slave_id == master->slave_id) { 186 list_del(&slave->open_list); 187 list_add_tail(&slave->open_list, 188 &master->slave_list_head); 189 spin_lock_irq(&slave_active_lock); 190 slave->master = master; 191 slave->timer = master->timer; 192 spin_unlock_irq(&slave_active_lock); 193 return; 194 } 195 } 196 } 197 } 198 199 /* 200 * look for slave instances matching with the slave id of the given master. 201 * when found, relink the open_link of slaves. 202 * 203 * call this with register_mutex down. 204 */ 205 static void snd_timer_check_master(struct snd_timer_instance *master) 206 { 207 struct snd_timer_instance *slave, *tmp; 208 209 /* check all pending slaves */ 210 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 211 if (slave->slave_class == master->slave_class && 212 slave->slave_id == master->slave_id) { 213 list_move_tail(&slave->open_list, &master->slave_list_head); 214 spin_lock_irq(&slave_active_lock); 215 slave->master = master; 216 slave->timer = master->timer; 217 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 218 list_add_tail(&slave->active_list, 219 &master->slave_active_head); 220 spin_unlock_irq(&slave_active_lock); 221 } 222 } 223 } 224 225 /* 226 * open a timer instance 227 * when opening a master, the slave id must be here given. 228 */ 229 int snd_timer_open(struct snd_timer_instance **ti, 230 char *owner, struct snd_timer_id *tid, 231 unsigned int slave_id) 232 { 233 struct snd_timer *timer; 234 struct snd_timer_instance *timeri = NULL; 235 236 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 237 /* open a slave instance */ 238 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 239 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 240 snd_printd("invalid slave class %i\n", tid->dev_sclass); 241 return -EINVAL; 242 } 243 mutex_lock(®ister_mutex); 244 timeri = snd_timer_instance_new(owner, NULL); 245 if (!timeri) { 246 mutex_unlock(®ister_mutex); 247 return -ENOMEM; 248 } 249 timeri->slave_class = tid->dev_sclass; 250 timeri->slave_id = tid->device; 251 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 252 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 253 snd_timer_check_slave(timeri); 254 mutex_unlock(®ister_mutex); 255 *ti = timeri; 256 return 0; 257 } 258 259 /* open a master instance */ 260 mutex_lock(®ister_mutex); 261 timer = snd_timer_find(tid); 262 #ifdef CONFIG_MODULES 263 if (!timer) { 264 mutex_unlock(®ister_mutex); 265 snd_timer_request(tid); 266 mutex_lock(®ister_mutex); 267 timer = snd_timer_find(tid); 268 } 269 #endif 270 if (!timer) { 271 mutex_unlock(®ister_mutex); 272 return -ENODEV; 273 } 274 if (!list_empty(&timer->open_list_head)) { 275 timeri = list_entry(timer->open_list_head.next, 276 struct snd_timer_instance, open_list); 277 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 278 mutex_unlock(®ister_mutex); 279 return -EBUSY; 280 } 281 } 282 timeri = snd_timer_instance_new(owner, timer); 283 if (!timeri) { 284 mutex_unlock(®ister_mutex); 285 return -ENOMEM; 286 } 287 timeri->slave_class = tid->dev_sclass; 288 timeri->slave_id = slave_id; 289 if (list_empty(&timer->open_list_head) && timer->hw.open) 290 timer->hw.open(timer); 291 list_add_tail(&timeri->open_list, &timer->open_list_head); 292 snd_timer_check_master(timeri); 293 mutex_unlock(®ister_mutex); 294 *ti = timeri; 295 return 0; 296 } 297 298 static int _snd_timer_stop(struct snd_timer_instance *timeri, 299 int keep_flag, int event); 300 301 /* 302 * close a timer instance 303 */ 304 int snd_timer_close(struct snd_timer_instance *timeri) 305 { 306 struct snd_timer *timer = NULL; 307 struct snd_timer_instance *slave, *tmp; 308 309 if (snd_BUG_ON(!timeri)) 310 return -ENXIO; 311 312 /* force to stop the timer */ 313 snd_timer_stop(timeri); 314 315 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 316 /* wait, until the active callback is finished */ 317 spin_lock_irq(&slave_active_lock); 318 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 319 spin_unlock_irq(&slave_active_lock); 320 udelay(10); 321 spin_lock_irq(&slave_active_lock); 322 } 323 spin_unlock_irq(&slave_active_lock); 324 mutex_lock(®ister_mutex); 325 list_del(&timeri->open_list); 326 mutex_unlock(®ister_mutex); 327 } else { 328 timer = timeri->timer; 329 /* wait, until the active callback is finished */ 330 spin_lock_irq(&timer->lock); 331 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 332 spin_unlock_irq(&timer->lock); 333 udelay(10); 334 spin_lock_irq(&timer->lock); 335 } 336 spin_unlock_irq(&timer->lock); 337 mutex_lock(®ister_mutex); 338 list_del(&timeri->open_list); 339 if (timer && list_empty(&timer->open_list_head) && 340 timer->hw.close) 341 timer->hw.close(timer); 342 /* remove slave links */ 343 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 344 open_list) { 345 spin_lock_irq(&slave_active_lock); 346 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); 347 list_move_tail(&slave->open_list, &snd_timer_slave_list); 348 slave->master = NULL; 349 slave->timer = NULL; 350 spin_unlock_irq(&slave_active_lock); 351 } 352 mutex_unlock(®ister_mutex); 353 } 354 if (timeri->private_free) 355 timeri->private_free(timeri); 356 kfree(timeri->owner); 357 kfree(timeri); 358 if (timer) 359 module_put(timer->module); 360 return 0; 361 } 362 363 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 364 { 365 struct snd_timer * timer; 366 367 if (timeri == NULL) 368 return 0; 369 if ((timer = timeri->timer) != NULL) { 370 if (timer->hw.c_resolution) 371 return timer->hw.c_resolution(timer); 372 return timer->hw.resolution; 373 } 374 return 0; 375 } 376 377 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 378 { 379 struct snd_timer *timer; 380 unsigned long flags; 381 unsigned long resolution = 0; 382 struct snd_timer_instance *ts; 383 struct timespec tstamp; 384 385 if (timer_tstamp_monotonic) 386 do_posix_clock_monotonic_gettime(&tstamp); 387 else 388 getnstimeofday(&tstamp); 389 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 390 event > SNDRV_TIMER_EVENT_PAUSE)) 391 return; 392 if (event == SNDRV_TIMER_EVENT_START || 393 event == SNDRV_TIMER_EVENT_CONTINUE) 394 resolution = snd_timer_resolution(ti); 395 if (ti->ccallback) 396 ti->ccallback(ti, event, &tstamp, resolution); 397 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 398 return; 399 timer = ti->timer; 400 if (timer == NULL) 401 return; 402 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 403 return; 404 spin_lock_irqsave(&timer->lock, flags); 405 list_for_each_entry(ts, &ti->slave_active_head, active_list) 406 if (ts->ccallback) 407 ts->ccallback(ti, event + 100, &tstamp, resolution); 408 spin_unlock_irqrestore(&timer->lock, flags); 409 } 410 411 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 412 unsigned long sticks) 413 { 414 list_del(&timeri->active_list); 415 list_add_tail(&timeri->active_list, &timer->active_list_head); 416 if (timer->running) { 417 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 418 goto __start_now; 419 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 420 timeri->flags |= SNDRV_TIMER_IFLG_START; 421 return 1; /* delayed start */ 422 } else { 423 timer->sticks = sticks; 424 timer->hw.start(timer); 425 __start_now: 426 timer->running++; 427 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 428 return 0; 429 } 430 } 431 432 static int snd_timer_start_slave(struct snd_timer_instance *timeri) 433 { 434 unsigned long flags; 435 436 spin_lock_irqsave(&slave_active_lock, flags); 437 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 438 if (timeri->master) 439 list_add_tail(&timeri->active_list, 440 &timeri->master->slave_active_head); 441 spin_unlock_irqrestore(&slave_active_lock, flags); 442 return 1; /* delayed start */ 443 } 444 445 /* 446 * start the timer instance 447 */ 448 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 449 { 450 struct snd_timer *timer; 451 int result = -EINVAL; 452 unsigned long flags; 453 454 if (timeri == NULL || ticks < 1) 455 return -EINVAL; 456 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 457 result = snd_timer_start_slave(timeri); 458 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 459 return result; 460 } 461 timer = timeri->timer; 462 if (timer == NULL) 463 return -EINVAL; 464 spin_lock_irqsave(&timer->lock, flags); 465 timeri->ticks = timeri->cticks = ticks; 466 timeri->pticks = 0; 467 result = snd_timer_start1(timer, timeri, ticks); 468 spin_unlock_irqrestore(&timer->lock, flags); 469 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 470 return result; 471 } 472 473 static int _snd_timer_stop(struct snd_timer_instance * timeri, 474 int keep_flag, int event) 475 { 476 struct snd_timer *timer; 477 unsigned long flags; 478 479 if (snd_BUG_ON(!timeri)) 480 return -ENXIO; 481 482 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 483 if (!keep_flag) { 484 spin_lock_irqsave(&slave_active_lock, flags); 485 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 486 spin_unlock_irqrestore(&slave_active_lock, flags); 487 } 488 goto __end; 489 } 490 timer = timeri->timer; 491 if (!timer) 492 return -EINVAL; 493 spin_lock_irqsave(&timer->lock, flags); 494 list_del_init(&timeri->ack_list); 495 list_del_init(&timeri->active_list); 496 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 497 !(--timer->running)) { 498 timer->hw.stop(timer); 499 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 500 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 501 snd_timer_reschedule(timer, 0); 502 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 503 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 504 timer->hw.start(timer); 505 } 506 } 507 } 508 if (!keep_flag) 509 timeri->flags &= 510 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 511 spin_unlock_irqrestore(&timer->lock, flags); 512 __end: 513 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 514 snd_timer_notify1(timeri, event); 515 return 0; 516 } 517 518 /* 519 * stop the timer instance. 520 * 521 * do not call this from the timer callback! 522 */ 523 int snd_timer_stop(struct snd_timer_instance *timeri) 524 { 525 struct snd_timer *timer; 526 unsigned long flags; 527 int err; 528 529 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); 530 if (err < 0) 531 return err; 532 timer = timeri->timer; 533 spin_lock_irqsave(&timer->lock, flags); 534 timeri->cticks = timeri->ticks; 535 timeri->pticks = 0; 536 spin_unlock_irqrestore(&timer->lock, flags); 537 return 0; 538 } 539 540 /* 541 * start again.. the tick is kept. 542 */ 543 int snd_timer_continue(struct snd_timer_instance *timeri) 544 { 545 struct snd_timer *timer; 546 int result = -EINVAL; 547 unsigned long flags; 548 549 if (timeri == NULL) 550 return result; 551 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 552 return snd_timer_start_slave(timeri); 553 timer = timeri->timer; 554 if (! timer) 555 return -EINVAL; 556 spin_lock_irqsave(&timer->lock, flags); 557 if (!timeri->cticks) 558 timeri->cticks = 1; 559 timeri->pticks = 0; 560 result = snd_timer_start1(timer, timeri, timer->sticks); 561 spin_unlock_irqrestore(&timer->lock, flags); 562 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 563 return result; 564 } 565 566 /* 567 * pause.. remember the ticks left 568 */ 569 int snd_timer_pause(struct snd_timer_instance * timeri) 570 { 571 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); 572 } 573 574 /* 575 * reschedule the timer 576 * 577 * start pending instances and check the scheduling ticks. 578 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 579 */ 580 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 581 { 582 struct snd_timer_instance *ti; 583 unsigned long ticks = ~0UL; 584 585 list_for_each_entry(ti, &timer->active_list_head, active_list) { 586 if (ti->flags & SNDRV_TIMER_IFLG_START) { 587 ti->flags &= ~SNDRV_TIMER_IFLG_START; 588 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 589 timer->running++; 590 } 591 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 592 if (ticks > ti->cticks) 593 ticks = ti->cticks; 594 } 595 } 596 if (ticks == ~0UL) { 597 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 598 return; 599 } 600 if (ticks > timer->hw.ticks) 601 ticks = timer->hw.ticks; 602 if (ticks_left != ticks) 603 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 604 timer->sticks = ticks; 605 } 606 607 /* 608 * timer tasklet 609 * 610 */ 611 static void snd_timer_tasklet(unsigned long arg) 612 { 613 struct snd_timer *timer = (struct snd_timer *) arg; 614 struct snd_timer_instance *ti; 615 struct list_head *p; 616 unsigned long resolution, ticks; 617 unsigned long flags; 618 619 spin_lock_irqsave(&timer->lock, flags); 620 /* now process all callbacks */ 621 while (!list_empty(&timer->sack_list_head)) { 622 p = timer->sack_list_head.next; /* get first item */ 623 ti = list_entry(p, struct snd_timer_instance, ack_list); 624 625 /* remove from ack_list and make empty */ 626 list_del_init(p); 627 628 ticks = ti->pticks; 629 ti->pticks = 0; 630 resolution = ti->resolution; 631 632 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 633 spin_unlock(&timer->lock); 634 if (ti->callback) 635 ti->callback(ti, resolution, ticks); 636 spin_lock(&timer->lock); 637 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 638 } 639 spin_unlock_irqrestore(&timer->lock, flags); 640 } 641 642 /* 643 * timer interrupt 644 * 645 * ticks_left is usually equal to timer->sticks. 646 * 647 */ 648 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 649 { 650 struct snd_timer_instance *ti, *ts, *tmp; 651 unsigned long resolution, ticks; 652 struct list_head *p, *ack_list_head; 653 unsigned long flags; 654 int use_tasklet = 0; 655 656 if (timer == NULL) 657 return; 658 659 spin_lock_irqsave(&timer->lock, flags); 660 661 /* remember the current resolution */ 662 if (timer->hw.c_resolution) 663 resolution = timer->hw.c_resolution(timer); 664 else 665 resolution = timer->hw.resolution; 666 667 /* loop for all active instances 668 * Here we cannot use list_for_each_entry because the active_list of a 669 * processed instance is relinked to done_list_head before the callback 670 * is called. 671 */ 672 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 673 active_list) { 674 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 675 continue; 676 ti->pticks += ticks_left; 677 ti->resolution = resolution; 678 if (ti->cticks < ticks_left) 679 ti->cticks = 0; 680 else 681 ti->cticks -= ticks_left; 682 if (ti->cticks) /* not expired */ 683 continue; 684 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 685 ti->cticks = ti->ticks; 686 } else { 687 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 688 if (--timer->running) 689 list_del(&ti->active_list); 690 } 691 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 692 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 693 ack_list_head = &timer->ack_list_head; 694 else 695 ack_list_head = &timer->sack_list_head; 696 if (list_empty(&ti->ack_list)) 697 list_add_tail(&ti->ack_list, ack_list_head); 698 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 699 ts->pticks = ti->pticks; 700 ts->resolution = resolution; 701 if (list_empty(&ts->ack_list)) 702 list_add_tail(&ts->ack_list, ack_list_head); 703 } 704 } 705 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 706 snd_timer_reschedule(timer, timer->sticks); 707 if (timer->running) { 708 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 709 timer->hw.stop(timer); 710 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 711 } 712 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 713 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 714 /* restart timer */ 715 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 716 timer->hw.start(timer); 717 } 718 } else { 719 timer->hw.stop(timer); 720 } 721 722 /* now process all fast callbacks */ 723 while (!list_empty(&timer->ack_list_head)) { 724 p = timer->ack_list_head.next; /* get first item */ 725 ti = list_entry(p, struct snd_timer_instance, ack_list); 726 727 /* remove from ack_list and make empty */ 728 list_del_init(p); 729 730 ticks = ti->pticks; 731 ti->pticks = 0; 732 733 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 734 spin_unlock(&timer->lock); 735 if (ti->callback) 736 ti->callback(ti, resolution, ticks); 737 spin_lock(&timer->lock); 738 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 739 } 740 741 /* do we have any slow callbacks? */ 742 use_tasklet = !list_empty(&timer->sack_list_head); 743 spin_unlock_irqrestore(&timer->lock, flags); 744 745 if (use_tasklet) 746 tasklet_schedule(&timer->task_queue); 747 } 748 749 /* 750 751 */ 752 753 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 754 struct snd_timer **rtimer) 755 { 756 struct snd_timer *timer; 757 int err; 758 static struct snd_device_ops ops = { 759 .dev_free = snd_timer_dev_free, 760 .dev_register = snd_timer_dev_register, 761 .dev_disconnect = snd_timer_dev_disconnect, 762 }; 763 764 if (snd_BUG_ON(!tid)) 765 return -EINVAL; 766 if (rtimer) 767 *rtimer = NULL; 768 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 769 if (timer == NULL) { 770 snd_printk(KERN_ERR "timer: cannot allocate\n"); 771 return -ENOMEM; 772 } 773 timer->tmr_class = tid->dev_class; 774 timer->card = card; 775 timer->tmr_device = tid->device; 776 timer->tmr_subdevice = tid->subdevice; 777 if (id) 778 strlcpy(timer->id, id, sizeof(timer->id)); 779 INIT_LIST_HEAD(&timer->device_list); 780 INIT_LIST_HEAD(&timer->open_list_head); 781 INIT_LIST_HEAD(&timer->active_list_head); 782 INIT_LIST_HEAD(&timer->ack_list_head); 783 INIT_LIST_HEAD(&timer->sack_list_head); 784 spin_lock_init(&timer->lock); 785 tasklet_init(&timer->task_queue, snd_timer_tasklet, 786 (unsigned long)timer); 787 if (card != NULL) { 788 timer->module = card->module; 789 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 790 if (err < 0) { 791 snd_timer_free(timer); 792 return err; 793 } 794 } 795 if (rtimer) 796 *rtimer = timer; 797 return 0; 798 } 799 800 static int snd_timer_free(struct snd_timer *timer) 801 { 802 if (!timer) 803 return 0; 804 805 mutex_lock(®ister_mutex); 806 if (! list_empty(&timer->open_list_head)) { 807 struct list_head *p, *n; 808 struct snd_timer_instance *ti; 809 snd_printk(KERN_WARNING "timer %p is busy?\n", timer); 810 list_for_each_safe(p, n, &timer->open_list_head) { 811 list_del_init(p); 812 ti = list_entry(p, struct snd_timer_instance, open_list); 813 ti->timer = NULL; 814 } 815 } 816 list_del(&timer->device_list); 817 mutex_unlock(®ister_mutex); 818 819 if (timer->private_free) 820 timer->private_free(timer); 821 kfree(timer); 822 return 0; 823 } 824 825 static int snd_timer_dev_free(struct snd_device *device) 826 { 827 struct snd_timer *timer = device->device_data; 828 return snd_timer_free(timer); 829 } 830 831 static int snd_timer_dev_register(struct snd_device *dev) 832 { 833 struct snd_timer *timer = dev->device_data; 834 struct snd_timer *timer1; 835 836 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 837 return -ENXIO; 838 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 839 !timer->hw.resolution && timer->hw.c_resolution == NULL) 840 return -EINVAL; 841 842 mutex_lock(®ister_mutex); 843 list_for_each_entry(timer1, &snd_timer_list, device_list) { 844 if (timer1->tmr_class > timer->tmr_class) 845 break; 846 if (timer1->tmr_class < timer->tmr_class) 847 continue; 848 if (timer1->card && timer->card) { 849 if (timer1->card->number > timer->card->number) 850 break; 851 if (timer1->card->number < timer->card->number) 852 continue; 853 } 854 if (timer1->tmr_device > timer->tmr_device) 855 break; 856 if (timer1->tmr_device < timer->tmr_device) 857 continue; 858 if (timer1->tmr_subdevice > timer->tmr_subdevice) 859 break; 860 if (timer1->tmr_subdevice < timer->tmr_subdevice) 861 continue; 862 /* conflicts.. */ 863 mutex_unlock(®ister_mutex); 864 return -EBUSY; 865 } 866 list_add_tail(&timer->device_list, &timer1->device_list); 867 mutex_unlock(®ister_mutex); 868 return 0; 869 } 870 871 static int snd_timer_dev_disconnect(struct snd_device *device) 872 { 873 struct snd_timer *timer = device->device_data; 874 mutex_lock(®ister_mutex); 875 list_del_init(&timer->device_list); 876 mutex_unlock(®ister_mutex); 877 return 0; 878 } 879 880 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 881 { 882 unsigned long flags; 883 unsigned long resolution = 0; 884 struct snd_timer_instance *ti, *ts; 885 886 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 887 return; 888 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 889 event > SNDRV_TIMER_EVENT_MRESUME)) 890 return; 891 spin_lock_irqsave(&timer->lock, flags); 892 if (event == SNDRV_TIMER_EVENT_MSTART || 893 event == SNDRV_TIMER_EVENT_MCONTINUE || 894 event == SNDRV_TIMER_EVENT_MRESUME) { 895 if (timer->hw.c_resolution) 896 resolution = timer->hw.c_resolution(timer); 897 else 898 resolution = timer->hw.resolution; 899 } 900 list_for_each_entry(ti, &timer->active_list_head, active_list) { 901 if (ti->ccallback) 902 ti->ccallback(ti, event, tstamp, resolution); 903 list_for_each_entry(ts, &ti->slave_active_head, active_list) 904 if (ts->ccallback) 905 ts->ccallback(ts, event, tstamp, resolution); 906 } 907 spin_unlock_irqrestore(&timer->lock, flags); 908 } 909 910 /* 911 * exported functions for global timers 912 */ 913 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 914 { 915 struct snd_timer_id tid; 916 917 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 918 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 919 tid.card = -1; 920 tid.device = device; 921 tid.subdevice = 0; 922 return snd_timer_new(NULL, id, &tid, rtimer); 923 } 924 925 int snd_timer_global_free(struct snd_timer *timer) 926 { 927 return snd_timer_free(timer); 928 } 929 930 int snd_timer_global_register(struct snd_timer *timer) 931 { 932 struct snd_device dev; 933 934 memset(&dev, 0, sizeof(dev)); 935 dev.device_data = timer; 936 return snd_timer_dev_register(&dev); 937 } 938 939 /* 940 * System timer 941 */ 942 943 struct snd_timer_system_private { 944 struct timer_list tlist; 945 unsigned long last_expires; 946 unsigned long last_jiffies; 947 unsigned long correction; 948 }; 949 950 static void snd_timer_s_function(unsigned long data) 951 { 952 struct snd_timer *timer = (struct snd_timer *)data; 953 struct snd_timer_system_private *priv = timer->private_data; 954 unsigned long jiff = jiffies; 955 if (time_after(jiff, priv->last_expires)) 956 priv->correction += (long)jiff - (long)priv->last_expires; 957 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 958 } 959 960 static int snd_timer_s_start(struct snd_timer * timer) 961 { 962 struct snd_timer_system_private *priv; 963 unsigned long njiff; 964 965 priv = (struct snd_timer_system_private *) timer->private_data; 966 njiff = (priv->last_jiffies = jiffies); 967 if (priv->correction > timer->sticks - 1) { 968 priv->correction -= timer->sticks - 1; 969 njiff++; 970 } else { 971 njiff += timer->sticks - priv->correction; 972 priv->correction = 0; 973 } 974 priv->last_expires = priv->tlist.expires = njiff; 975 add_timer(&priv->tlist); 976 return 0; 977 } 978 979 static int snd_timer_s_stop(struct snd_timer * timer) 980 { 981 struct snd_timer_system_private *priv; 982 unsigned long jiff; 983 984 priv = (struct snd_timer_system_private *) timer->private_data; 985 del_timer(&priv->tlist); 986 jiff = jiffies; 987 if (time_before(jiff, priv->last_expires)) 988 timer->sticks = priv->last_expires - jiff; 989 else 990 timer->sticks = 1; 991 priv->correction = 0; 992 return 0; 993 } 994 995 static struct snd_timer_hardware snd_timer_system = 996 { 997 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 998 .resolution = 1000000000L / HZ, 999 .ticks = 10000000L, 1000 .start = snd_timer_s_start, 1001 .stop = snd_timer_s_stop 1002 }; 1003 1004 static void snd_timer_free_system(struct snd_timer *timer) 1005 { 1006 kfree(timer->private_data); 1007 } 1008 1009 static int snd_timer_register_system(void) 1010 { 1011 struct snd_timer *timer; 1012 struct snd_timer_system_private *priv; 1013 int err; 1014 1015 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1016 if (err < 0) 1017 return err; 1018 strcpy(timer->name, "system timer"); 1019 timer->hw = snd_timer_system; 1020 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1021 if (priv == NULL) { 1022 snd_timer_free(timer); 1023 return -ENOMEM; 1024 } 1025 init_timer(&priv->tlist); 1026 priv->tlist.function = snd_timer_s_function; 1027 priv->tlist.data = (unsigned long) timer; 1028 timer->private_data = priv; 1029 timer->private_free = snd_timer_free_system; 1030 return snd_timer_global_register(timer); 1031 } 1032 1033 #ifdef CONFIG_PROC_FS 1034 /* 1035 * Info interface 1036 */ 1037 1038 static void snd_timer_proc_read(struct snd_info_entry *entry, 1039 struct snd_info_buffer *buffer) 1040 { 1041 struct snd_timer *timer; 1042 struct snd_timer_instance *ti; 1043 1044 mutex_lock(®ister_mutex); 1045 list_for_each_entry(timer, &snd_timer_list, device_list) { 1046 switch (timer->tmr_class) { 1047 case SNDRV_TIMER_CLASS_GLOBAL: 1048 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1049 break; 1050 case SNDRV_TIMER_CLASS_CARD: 1051 snd_iprintf(buffer, "C%i-%i: ", 1052 timer->card->number, timer->tmr_device); 1053 break; 1054 case SNDRV_TIMER_CLASS_PCM: 1055 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1056 timer->tmr_device, timer->tmr_subdevice); 1057 break; 1058 default: 1059 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1060 timer->card ? timer->card->number : -1, 1061 timer->tmr_device, timer->tmr_subdevice); 1062 } 1063 snd_iprintf(buffer, "%s :", timer->name); 1064 if (timer->hw.resolution) 1065 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1066 timer->hw.resolution / 1000, 1067 timer->hw.resolution % 1000, 1068 timer->hw.ticks); 1069 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1070 snd_iprintf(buffer, " SLAVE"); 1071 snd_iprintf(buffer, "\n"); 1072 list_for_each_entry(ti, &timer->open_list_head, open_list) 1073 snd_iprintf(buffer, " Client %s : %s\n", 1074 ti->owner ? ti->owner : "unknown", 1075 ti->flags & (SNDRV_TIMER_IFLG_START | 1076 SNDRV_TIMER_IFLG_RUNNING) 1077 ? "running" : "stopped"); 1078 } 1079 mutex_unlock(®ister_mutex); 1080 } 1081 1082 static struct snd_info_entry *snd_timer_proc_entry; 1083 1084 static void __init snd_timer_proc_init(void) 1085 { 1086 struct snd_info_entry *entry; 1087 1088 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1089 if (entry != NULL) { 1090 entry->c.text.read = snd_timer_proc_read; 1091 if (snd_info_register(entry) < 0) { 1092 snd_info_free_entry(entry); 1093 entry = NULL; 1094 } 1095 } 1096 snd_timer_proc_entry = entry; 1097 } 1098 1099 static void __exit snd_timer_proc_done(void) 1100 { 1101 snd_info_free_entry(snd_timer_proc_entry); 1102 } 1103 #else /* !CONFIG_PROC_FS */ 1104 #define snd_timer_proc_init() 1105 #define snd_timer_proc_done() 1106 #endif 1107 1108 /* 1109 * USER SPACE interface 1110 */ 1111 1112 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1113 unsigned long resolution, 1114 unsigned long ticks) 1115 { 1116 struct snd_timer_user *tu = timeri->callback_data; 1117 struct snd_timer_read *r; 1118 int prev; 1119 1120 spin_lock(&tu->qlock); 1121 if (tu->qused > 0) { 1122 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1123 r = &tu->queue[prev]; 1124 if (r->resolution == resolution) { 1125 r->ticks += ticks; 1126 goto __wake; 1127 } 1128 } 1129 if (tu->qused >= tu->queue_size) { 1130 tu->overrun++; 1131 } else { 1132 r = &tu->queue[tu->qtail++]; 1133 tu->qtail %= tu->queue_size; 1134 r->resolution = resolution; 1135 r->ticks = ticks; 1136 tu->qused++; 1137 } 1138 __wake: 1139 spin_unlock(&tu->qlock); 1140 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1141 wake_up(&tu->qchange_sleep); 1142 } 1143 1144 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1145 struct snd_timer_tread *tread) 1146 { 1147 if (tu->qused >= tu->queue_size) { 1148 tu->overrun++; 1149 } else { 1150 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1151 tu->qtail %= tu->queue_size; 1152 tu->qused++; 1153 } 1154 } 1155 1156 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1157 int event, 1158 struct timespec *tstamp, 1159 unsigned long resolution) 1160 { 1161 struct snd_timer_user *tu = timeri->callback_data; 1162 struct snd_timer_tread r1; 1163 unsigned long flags; 1164 1165 if (event >= SNDRV_TIMER_EVENT_START && 1166 event <= SNDRV_TIMER_EVENT_PAUSE) 1167 tu->tstamp = *tstamp; 1168 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1169 return; 1170 r1.event = event; 1171 r1.tstamp = *tstamp; 1172 r1.val = resolution; 1173 spin_lock_irqsave(&tu->qlock, flags); 1174 snd_timer_user_append_to_tqueue(tu, &r1); 1175 spin_unlock_irqrestore(&tu->qlock, flags); 1176 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1177 wake_up(&tu->qchange_sleep); 1178 } 1179 1180 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1181 unsigned long resolution, 1182 unsigned long ticks) 1183 { 1184 struct snd_timer_user *tu = timeri->callback_data; 1185 struct snd_timer_tread *r, r1; 1186 struct timespec tstamp; 1187 int prev, append = 0; 1188 1189 memset(&tstamp, 0, sizeof(tstamp)); 1190 spin_lock(&tu->qlock); 1191 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1192 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1193 spin_unlock(&tu->qlock); 1194 return; 1195 } 1196 if (tu->last_resolution != resolution || ticks > 0) { 1197 if (timer_tstamp_monotonic) 1198 do_posix_clock_monotonic_gettime(&tstamp); 1199 else 1200 getnstimeofday(&tstamp); 1201 } 1202 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1203 tu->last_resolution != resolution) { 1204 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1205 r1.tstamp = tstamp; 1206 r1.val = resolution; 1207 snd_timer_user_append_to_tqueue(tu, &r1); 1208 tu->last_resolution = resolution; 1209 append++; 1210 } 1211 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1212 goto __wake; 1213 if (ticks == 0) 1214 goto __wake; 1215 if (tu->qused > 0) { 1216 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1217 r = &tu->tqueue[prev]; 1218 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1219 r->tstamp = tstamp; 1220 r->val += ticks; 1221 append++; 1222 goto __wake; 1223 } 1224 } 1225 r1.event = SNDRV_TIMER_EVENT_TICK; 1226 r1.tstamp = tstamp; 1227 r1.val = ticks; 1228 snd_timer_user_append_to_tqueue(tu, &r1); 1229 append++; 1230 __wake: 1231 spin_unlock(&tu->qlock); 1232 if (append == 0) 1233 return; 1234 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1235 wake_up(&tu->qchange_sleep); 1236 } 1237 1238 static int snd_timer_user_open(struct inode *inode, struct file *file) 1239 { 1240 struct snd_timer_user *tu; 1241 1242 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1243 if (tu == NULL) 1244 return -ENOMEM; 1245 spin_lock_init(&tu->qlock); 1246 init_waitqueue_head(&tu->qchange_sleep); 1247 mutex_init(&tu->tread_sem); 1248 tu->ticks = 1; 1249 tu->queue_size = 128; 1250 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1251 GFP_KERNEL); 1252 if (tu->queue == NULL) { 1253 kfree(tu); 1254 return -ENOMEM; 1255 } 1256 file->private_data = tu; 1257 return 0; 1258 } 1259 1260 static int snd_timer_user_release(struct inode *inode, struct file *file) 1261 { 1262 struct snd_timer_user *tu; 1263 1264 if (file->private_data) { 1265 tu = file->private_data; 1266 file->private_data = NULL; 1267 if (tu->timeri) 1268 snd_timer_close(tu->timeri); 1269 kfree(tu->queue); 1270 kfree(tu->tqueue); 1271 kfree(tu); 1272 } 1273 return 0; 1274 } 1275 1276 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1277 { 1278 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1279 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1280 id->card = -1; 1281 id->device = -1; 1282 id->subdevice = -1; 1283 } 1284 1285 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1286 { 1287 id->dev_class = timer->tmr_class; 1288 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1289 id->card = timer->card ? timer->card->number : -1; 1290 id->device = timer->tmr_device; 1291 id->subdevice = timer->tmr_subdevice; 1292 } 1293 1294 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1295 { 1296 struct snd_timer_id id; 1297 struct snd_timer *timer; 1298 struct list_head *p; 1299 1300 if (copy_from_user(&id, _tid, sizeof(id))) 1301 return -EFAULT; 1302 mutex_lock(®ister_mutex); 1303 if (id.dev_class < 0) { /* first item */ 1304 if (list_empty(&snd_timer_list)) 1305 snd_timer_user_zero_id(&id); 1306 else { 1307 timer = list_entry(snd_timer_list.next, 1308 struct snd_timer, device_list); 1309 snd_timer_user_copy_id(&id, timer); 1310 } 1311 } else { 1312 switch (id.dev_class) { 1313 case SNDRV_TIMER_CLASS_GLOBAL: 1314 id.device = id.device < 0 ? 0 : id.device + 1; 1315 list_for_each(p, &snd_timer_list) { 1316 timer = list_entry(p, struct snd_timer, device_list); 1317 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1318 snd_timer_user_copy_id(&id, timer); 1319 break; 1320 } 1321 if (timer->tmr_device >= id.device) { 1322 snd_timer_user_copy_id(&id, timer); 1323 break; 1324 } 1325 } 1326 if (p == &snd_timer_list) 1327 snd_timer_user_zero_id(&id); 1328 break; 1329 case SNDRV_TIMER_CLASS_CARD: 1330 case SNDRV_TIMER_CLASS_PCM: 1331 if (id.card < 0) { 1332 id.card = 0; 1333 } else { 1334 if (id.card < 0) { 1335 id.card = 0; 1336 } else { 1337 if (id.device < 0) { 1338 id.device = 0; 1339 } else { 1340 if (id.subdevice < 0) { 1341 id.subdevice = 0; 1342 } else { 1343 id.subdevice++; 1344 } 1345 } 1346 } 1347 } 1348 list_for_each(p, &snd_timer_list) { 1349 timer = list_entry(p, struct snd_timer, device_list); 1350 if (timer->tmr_class > id.dev_class) { 1351 snd_timer_user_copy_id(&id, timer); 1352 break; 1353 } 1354 if (timer->tmr_class < id.dev_class) 1355 continue; 1356 if (timer->card->number > id.card) { 1357 snd_timer_user_copy_id(&id, timer); 1358 break; 1359 } 1360 if (timer->card->number < id.card) 1361 continue; 1362 if (timer->tmr_device > id.device) { 1363 snd_timer_user_copy_id(&id, timer); 1364 break; 1365 } 1366 if (timer->tmr_device < id.device) 1367 continue; 1368 if (timer->tmr_subdevice > id.subdevice) { 1369 snd_timer_user_copy_id(&id, timer); 1370 break; 1371 } 1372 if (timer->tmr_subdevice < id.subdevice) 1373 continue; 1374 snd_timer_user_copy_id(&id, timer); 1375 break; 1376 } 1377 if (p == &snd_timer_list) 1378 snd_timer_user_zero_id(&id); 1379 break; 1380 default: 1381 snd_timer_user_zero_id(&id); 1382 } 1383 } 1384 mutex_unlock(®ister_mutex); 1385 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1386 return -EFAULT; 1387 return 0; 1388 } 1389 1390 static int snd_timer_user_ginfo(struct file *file, 1391 struct snd_timer_ginfo __user *_ginfo) 1392 { 1393 struct snd_timer_ginfo *ginfo; 1394 struct snd_timer_id tid; 1395 struct snd_timer *t; 1396 struct list_head *p; 1397 int err = 0; 1398 1399 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1400 if (IS_ERR(ginfo)) 1401 return PTR_ERR(ginfo); 1402 1403 tid = ginfo->tid; 1404 memset(ginfo, 0, sizeof(*ginfo)); 1405 ginfo->tid = tid; 1406 mutex_lock(®ister_mutex); 1407 t = snd_timer_find(&tid); 1408 if (t != NULL) { 1409 ginfo->card = t->card ? t->card->number : -1; 1410 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1411 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1412 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1413 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1414 ginfo->resolution = t->hw.resolution; 1415 if (t->hw.resolution_min > 0) { 1416 ginfo->resolution_min = t->hw.resolution_min; 1417 ginfo->resolution_max = t->hw.resolution_max; 1418 } 1419 list_for_each(p, &t->open_list_head) { 1420 ginfo->clients++; 1421 } 1422 } else { 1423 err = -ENODEV; 1424 } 1425 mutex_unlock(®ister_mutex); 1426 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1427 err = -EFAULT; 1428 kfree(ginfo); 1429 return err; 1430 } 1431 1432 static int snd_timer_user_gparams(struct file *file, 1433 struct snd_timer_gparams __user *_gparams) 1434 { 1435 struct snd_timer_gparams gparams; 1436 struct snd_timer *t; 1437 int err; 1438 1439 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1440 return -EFAULT; 1441 mutex_lock(®ister_mutex); 1442 t = snd_timer_find(&gparams.tid); 1443 if (!t) { 1444 err = -ENODEV; 1445 goto _error; 1446 } 1447 if (!list_empty(&t->open_list_head)) { 1448 err = -EBUSY; 1449 goto _error; 1450 } 1451 if (!t->hw.set_period) { 1452 err = -ENOSYS; 1453 goto _error; 1454 } 1455 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1456 _error: 1457 mutex_unlock(®ister_mutex); 1458 return err; 1459 } 1460 1461 static int snd_timer_user_gstatus(struct file *file, 1462 struct snd_timer_gstatus __user *_gstatus) 1463 { 1464 struct snd_timer_gstatus gstatus; 1465 struct snd_timer_id tid; 1466 struct snd_timer *t; 1467 int err = 0; 1468 1469 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1470 return -EFAULT; 1471 tid = gstatus.tid; 1472 memset(&gstatus, 0, sizeof(gstatus)); 1473 gstatus.tid = tid; 1474 mutex_lock(®ister_mutex); 1475 t = snd_timer_find(&tid); 1476 if (t != NULL) { 1477 if (t->hw.c_resolution) 1478 gstatus.resolution = t->hw.c_resolution(t); 1479 else 1480 gstatus.resolution = t->hw.resolution; 1481 if (t->hw.precise_resolution) { 1482 t->hw.precise_resolution(t, &gstatus.resolution_num, 1483 &gstatus.resolution_den); 1484 } else { 1485 gstatus.resolution_num = gstatus.resolution; 1486 gstatus.resolution_den = 1000000000uL; 1487 } 1488 } else { 1489 err = -ENODEV; 1490 } 1491 mutex_unlock(®ister_mutex); 1492 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1493 err = -EFAULT; 1494 return err; 1495 } 1496 1497 static int snd_timer_user_tselect(struct file *file, 1498 struct snd_timer_select __user *_tselect) 1499 { 1500 struct snd_timer_user *tu; 1501 struct snd_timer_select tselect; 1502 char str[32]; 1503 int err = 0; 1504 1505 tu = file->private_data; 1506 mutex_lock(&tu->tread_sem); 1507 if (tu->timeri) { 1508 snd_timer_close(tu->timeri); 1509 tu->timeri = NULL; 1510 } 1511 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1512 err = -EFAULT; 1513 goto __err; 1514 } 1515 sprintf(str, "application %i", current->pid); 1516 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1517 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1518 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1519 if (err < 0) 1520 goto __err; 1521 1522 kfree(tu->queue); 1523 tu->queue = NULL; 1524 kfree(tu->tqueue); 1525 tu->tqueue = NULL; 1526 if (tu->tread) { 1527 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1528 GFP_KERNEL); 1529 if (tu->tqueue == NULL) 1530 err = -ENOMEM; 1531 } else { 1532 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1533 GFP_KERNEL); 1534 if (tu->queue == NULL) 1535 err = -ENOMEM; 1536 } 1537 1538 if (err < 0) { 1539 snd_timer_close(tu->timeri); 1540 tu->timeri = NULL; 1541 } else { 1542 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1543 tu->timeri->callback = tu->tread 1544 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1545 tu->timeri->ccallback = snd_timer_user_ccallback; 1546 tu->timeri->callback_data = (void *)tu; 1547 } 1548 1549 __err: 1550 mutex_unlock(&tu->tread_sem); 1551 return err; 1552 } 1553 1554 static int snd_timer_user_info(struct file *file, 1555 struct snd_timer_info __user *_info) 1556 { 1557 struct snd_timer_user *tu; 1558 struct snd_timer_info *info; 1559 struct snd_timer *t; 1560 int err = 0; 1561 1562 tu = file->private_data; 1563 if (!tu->timeri) 1564 return -EBADFD; 1565 t = tu->timeri->timer; 1566 if (!t) 1567 return -EBADFD; 1568 1569 info = kzalloc(sizeof(*info), GFP_KERNEL); 1570 if (! info) 1571 return -ENOMEM; 1572 info->card = t->card ? t->card->number : -1; 1573 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1574 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1575 strlcpy(info->id, t->id, sizeof(info->id)); 1576 strlcpy(info->name, t->name, sizeof(info->name)); 1577 info->resolution = t->hw.resolution; 1578 if (copy_to_user(_info, info, sizeof(*_info))) 1579 err = -EFAULT; 1580 kfree(info); 1581 return err; 1582 } 1583 1584 static int snd_timer_user_params(struct file *file, 1585 struct snd_timer_params __user *_params) 1586 { 1587 struct snd_timer_user *tu; 1588 struct snd_timer_params params; 1589 struct snd_timer *t; 1590 struct snd_timer_read *tr; 1591 struct snd_timer_tread *ttr; 1592 int err; 1593 1594 tu = file->private_data; 1595 if (!tu->timeri) 1596 return -EBADFD; 1597 t = tu->timeri->timer; 1598 if (!t) 1599 return -EBADFD; 1600 if (copy_from_user(¶ms, _params, sizeof(params))) 1601 return -EFAULT; 1602 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1603 err = -EINVAL; 1604 goto _end; 1605 } 1606 if (params.queue_size > 0 && 1607 (params.queue_size < 32 || params.queue_size > 1024)) { 1608 err = -EINVAL; 1609 goto _end; 1610 } 1611 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1612 (1<<SNDRV_TIMER_EVENT_TICK)| 1613 (1<<SNDRV_TIMER_EVENT_START)| 1614 (1<<SNDRV_TIMER_EVENT_STOP)| 1615 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1616 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1617 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1618 (1<<SNDRV_TIMER_EVENT_RESUME)| 1619 (1<<SNDRV_TIMER_EVENT_MSTART)| 1620 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1621 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1622 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1623 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1624 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1625 err = -EINVAL; 1626 goto _end; 1627 } 1628 snd_timer_stop(tu->timeri); 1629 spin_lock_irq(&t->lock); 1630 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1631 SNDRV_TIMER_IFLG_EXCLUSIVE| 1632 SNDRV_TIMER_IFLG_EARLY_EVENT); 1633 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1634 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1635 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1636 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1637 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1638 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1639 spin_unlock_irq(&t->lock); 1640 if (params.queue_size > 0 && 1641 (unsigned int)tu->queue_size != params.queue_size) { 1642 if (tu->tread) { 1643 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1644 GFP_KERNEL); 1645 if (ttr) { 1646 kfree(tu->tqueue); 1647 tu->queue_size = params.queue_size; 1648 tu->tqueue = ttr; 1649 } 1650 } else { 1651 tr = kmalloc(params.queue_size * sizeof(*tr), 1652 GFP_KERNEL); 1653 if (tr) { 1654 kfree(tu->queue); 1655 tu->queue_size = params.queue_size; 1656 tu->queue = tr; 1657 } 1658 } 1659 } 1660 tu->qhead = tu->qtail = tu->qused = 0; 1661 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1662 if (tu->tread) { 1663 struct snd_timer_tread tread; 1664 tread.event = SNDRV_TIMER_EVENT_EARLY; 1665 tread.tstamp.tv_sec = 0; 1666 tread.tstamp.tv_nsec = 0; 1667 tread.val = 0; 1668 snd_timer_user_append_to_tqueue(tu, &tread); 1669 } else { 1670 struct snd_timer_read *r = &tu->queue[0]; 1671 r->resolution = 0; 1672 r->ticks = 0; 1673 tu->qused++; 1674 tu->qtail++; 1675 } 1676 } 1677 tu->filter = params.filter; 1678 tu->ticks = params.ticks; 1679 err = 0; 1680 _end: 1681 if (copy_to_user(_params, ¶ms, sizeof(params))) 1682 return -EFAULT; 1683 return err; 1684 } 1685 1686 static int snd_timer_user_status(struct file *file, 1687 struct snd_timer_status __user *_status) 1688 { 1689 struct snd_timer_user *tu; 1690 struct snd_timer_status status; 1691 1692 tu = file->private_data; 1693 if (!tu->timeri) 1694 return -EBADFD; 1695 memset(&status, 0, sizeof(status)); 1696 status.tstamp = tu->tstamp; 1697 status.resolution = snd_timer_resolution(tu->timeri); 1698 status.lost = tu->timeri->lost; 1699 status.overrun = tu->overrun; 1700 spin_lock_irq(&tu->qlock); 1701 status.queue = tu->qused; 1702 spin_unlock_irq(&tu->qlock); 1703 if (copy_to_user(_status, &status, sizeof(status))) 1704 return -EFAULT; 1705 return 0; 1706 } 1707 1708 static int snd_timer_user_start(struct file *file) 1709 { 1710 int err; 1711 struct snd_timer_user *tu; 1712 1713 tu = file->private_data; 1714 if (!tu->timeri) 1715 return -EBADFD; 1716 snd_timer_stop(tu->timeri); 1717 tu->timeri->lost = 0; 1718 tu->last_resolution = 0; 1719 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1720 } 1721 1722 static int snd_timer_user_stop(struct file *file) 1723 { 1724 int err; 1725 struct snd_timer_user *tu; 1726 1727 tu = file->private_data; 1728 if (!tu->timeri) 1729 return -EBADFD; 1730 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1731 } 1732 1733 static int snd_timer_user_continue(struct file *file) 1734 { 1735 int err; 1736 struct snd_timer_user *tu; 1737 1738 tu = file->private_data; 1739 if (!tu->timeri) 1740 return -EBADFD; 1741 tu->timeri->lost = 0; 1742 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1743 } 1744 1745 static int snd_timer_user_pause(struct file *file) 1746 { 1747 int err; 1748 struct snd_timer_user *tu; 1749 1750 tu = file->private_data; 1751 if (!tu->timeri) 1752 return -EBADFD; 1753 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1754 } 1755 1756 enum { 1757 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1758 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1759 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1760 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1761 }; 1762 1763 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1764 unsigned long arg) 1765 { 1766 struct snd_timer_user *tu; 1767 void __user *argp = (void __user *)arg; 1768 int __user *p = argp; 1769 1770 tu = file->private_data; 1771 switch (cmd) { 1772 case SNDRV_TIMER_IOCTL_PVERSION: 1773 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1774 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1775 return snd_timer_user_next_device(argp); 1776 case SNDRV_TIMER_IOCTL_TREAD: 1777 { 1778 int xarg; 1779 1780 mutex_lock(&tu->tread_sem); 1781 if (tu->timeri) { /* too late */ 1782 mutex_unlock(&tu->tread_sem); 1783 return -EBUSY; 1784 } 1785 if (get_user(xarg, p)) { 1786 mutex_unlock(&tu->tread_sem); 1787 return -EFAULT; 1788 } 1789 tu->tread = xarg ? 1 : 0; 1790 mutex_unlock(&tu->tread_sem); 1791 return 0; 1792 } 1793 case SNDRV_TIMER_IOCTL_GINFO: 1794 return snd_timer_user_ginfo(file, argp); 1795 case SNDRV_TIMER_IOCTL_GPARAMS: 1796 return snd_timer_user_gparams(file, argp); 1797 case SNDRV_TIMER_IOCTL_GSTATUS: 1798 return snd_timer_user_gstatus(file, argp); 1799 case SNDRV_TIMER_IOCTL_SELECT: 1800 return snd_timer_user_tselect(file, argp); 1801 case SNDRV_TIMER_IOCTL_INFO: 1802 return snd_timer_user_info(file, argp); 1803 case SNDRV_TIMER_IOCTL_PARAMS: 1804 return snd_timer_user_params(file, argp); 1805 case SNDRV_TIMER_IOCTL_STATUS: 1806 return snd_timer_user_status(file, argp); 1807 case SNDRV_TIMER_IOCTL_START: 1808 case SNDRV_TIMER_IOCTL_START_OLD: 1809 return snd_timer_user_start(file); 1810 case SNDRV_TIMER_IOCTL_STOP: 1811 case SNDRV_TIMER_IOCTL_STOP_OLD: 1812 return snd_timer_user_stop(file); 1813 case SNDRV_TIMER_IOCTL_CONTINUE: 1814 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1815 return snd_timer_user_continue(file); 1816 case SNDRV_TIMER_IOCTL_PAUSE: 1817 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1818 return snd_timer_user_pause(file); 1819 } 1820 return -ENOTTY; 1821 } 1822 1823 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1824 { 1825 struct snd_timer_user *tu; 1826 1827 tu = file->private_data; 1828 return fasync_helper(fd, file, on, &tu->fasync); 1829 } 1830 1831 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1832 size_t count, loff_t *offset) 1833 { 1834 struct snd_timer_user *tu; 1835 long result = 0, unit; 1836 int err = 0; 1837 1838 tu = file->private_data; 1839 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1840 spin_lock_irq(&tu->qlock); 1841 while ((long)count - result >= unit) { 1842 while (!tu->qused) { 1843 wait_queue_t wait; 1844 1845 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1846 err = -EAGAIN; 1847 break; 1848 } 1849 1850 set_current_state(TASK_INTERRUPTIBLE); 1851 init_waitqueue_entry(&wait, current); 1852 add_wait_queue(&tu->qchange_sleep, &wait); 1853 1854 spin_unlock_irq(&tu->qlock); 1855 schedule(); 1856 spin_lock_irq(&tu->qlock); 1857 1858 remove_wait_queue(&tu->qchange_sleep, &wait); 1859 1860 if (signal_pending(current)) { 1861 err = -ERESTARTSYS; 1862 break; 1863 } 1864 } 1865 1866 spin_unlock_irq(&tu->qlock); 1867 if (err < 0) 1868 goto _error; 1869 1870 if (tu->tread) { 1871 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1872 sizeof(struct snd_timer_tread))) { 1873 err = -EFAULT; 1874 goto _error; 1875 } 1876 } else { 1877 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1878 sizeof(struct snd_timer_read))) { 1879 err = -EFAULT; 1880 goto _error; 1881 } 1882 } 1883 1884 tu->qhead %= tu->queue_size; 1885 1886 result += unit; 1887 buffer += unit; 1888 1889 spin_lock_irq(&tu->qlock); 1890 tu->qused--; 1891 } 1892 spin_unlock_irq(&tu->qlock); 1893 _error: 1894 return result > 0 ? result : err; 1895 } 1896 1897 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1898 { 1899 unsigned int mask; 1900 struct snd_timer_user *tu; 1901 1902 tu = file->private_data; 1903 1904 poll_wait(file, &tu->qchange_sleep, wait); 1905 1906 mask = 0; 1907 if (tu->qused) 1908 mask |= POLLIN | POLLRDNORM; 1909 1910 return mask; 1911 } 1912 1913 #ifdef CONFIG_COMPAT 1914 #include "timer_compat.c" 1915 #else 1916 #define snd_timer_user_ioctl_compat NULL 1917 #endif 1918 1919 static const struct file_operations snd_timer_f_ops = 1920 { 1921 .owner = THIS_MODULE, 1922 .read = snd_timer_user_read, 1923 .open = snd_timer_user_open, 1924 .release = snd_timer_user_release, 1925 .poll = snd_timer_user_poll, 1926 .unlocked_ioctl = snd_timer_user_ioctl, 1927 .compat_ioctl = snd_timer_user_ioctl_compat, 1928 .fasync = snd_timer_user_fasync, 1929 }; 1930 1931 /* 1932 * ENTRY functions 1933 */ 1934 1935 static int __init alsa_timer_init(void) 1936 { 1937 int err; 1938 1939 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1940 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 1941 "system timer"); 1942 #endif 1943 1944 if ((err = snd_timer_register_system()) < 0) 1945 snd_printk(KERN_ERR "unable to register system timer (%i)\n", 1946 err); 1947 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 1948 &snd_timer_f_ops, NULL, "timer")) < 0) 1949 snd_printk(KERN_ERR "unable to register timer device (%i)\n", 1950 err); 1951 snd_timer_proc_init(); 1952 return 0; 1953 } 1954 1955 static void __exit alsa_timer_exit(void) 1956 { 1957 struct list_head *p, *n; 1958 1959 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 1960 /* unregister the system timer */ 1961 list_for_each_safe(p, n, &snd_timer_list) { 1962 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list); 1963 snd_timer_free(timer); 1964 } 1965 snd_timer_proc_done(); 1966 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1967 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1968 #endif 1969 } 1970 1971 module_init(alsa_timer_init) 1972 module_exit(alsa_timer_exit) 1973 1974 EXPORT_SYMBOL(snd_timer_open); 1975 EXPORT_SYMBOL(snd_timer_close); 1976 EXPORT_SYMBOL(snd_timer_resolution); 1977 EXPORT_SYMBOL(snd_timer_start); 1978 EXPORT_SYMBOL(snd_timer_stop); 1979 EXPORT_SYMBOL(snd_timer_continue); 1980 EXPORT_SYMBOL(snd_timer_pause); 1981 EXPORT_SYMBOL(snd_timer_new); 1982 EXPORT_SYMBOL(snd_timer_notify); 1983 EXPORT_SYMBOL(snd_timer_global_new); 1984 EXPORT_SYMBOL(snd_timer_global_free); 1985 EXPORT_SYMBOL(snd_timer_global_register); 1986 EXPORT_SYMBOL(snd_timer_interrupt); 1987