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