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