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 struct list_head *p; 134 135 list_for_each(p, &snd_timer_list) { 136 timer = list_entry(p, struct snd_timer, device_list); 137 138 if (timer->tmr_class != tid->dev_class) 139 continue; 140 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 141 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 142 (timer->card == NULL || 143 timer->card->number != tid->card)) 144 continue; 145 if (timer->tmr_device != tid->device) 146 continue; 147 if (timer->tmr_subdevice != tid->subdevice) 148 continue; 149 return timer; 150 } 151 return NULL; 152 } 153 154 #ifdef CONFIG_KMOD 155 156 static void snd_timer_request(struct snd_timer_id *tid) 157 { 158 if (! current->fs->root) 159 return; 160 switch (tid->dev_class) { 161 case SNDRV_TIMER_CLASS_GLOBAL: 162 if (tid->device < timer_limit) 163 request_module("snd-timer-%i", tid->device); 164 break; 165 case SNDRV_TIMER_CLASS_CARD: 166 case SNDRV_TIMER_CLASS_PCM: 167 if (tid->card < snd_ecards_limit) 168 request_module("snd-card-%i", tid->card); 169 break; 170 default: 171 break; 172 } 173 } 174 175 #endif 176 177 /* 178 * look for a master instance matching with the slave id of the given slave. 179 * when found, relink the open_link of the slave. 180 * 181 * call this with register_mutex down. 182 */ 183 static void snd_timer_check_slave(struct snd_timer_instance *slave) 184 { 185 struct snd_timer *timer; 186 struct snd_timer_instance *master; 187 struct list_head *p, *q; 188 189 /* FIXME: it's really dumb to look up all entries.. */ 190 list_for_each(p, &snd_timer_list) { 191 timer = list_entry(p, struct snd_timer, device_list); 192 list_for_each(q, &timer->open_list_head) { 193 master = list_entry(q, struct snd_timer_instance, open_list); 194 if (slave->slave_class == master->slave_class && 195 slave->slave_id == master->slave_id) { 196 list_del(&slave->open_list); 197 list_add_tail(&slave->open_list, 198 &master->slave_list_head); 199 spin_lock_irq(&slave_active_lock); 200 slave->master = master; 201 slave->timer = master->timer; 202 spin_unlock_irq(&slave_active_lock); 203 return; 204 } 205 } 206 } 207 } 208 209 /* 210 * look for slave instances matching with the slave id of the given master. 211 * when found, relink the open_link of slaves. 212 * 213 * call this with register_mutex down. 214 */ 215 static void snd_timer_check_master(struct snd_timer_instance *master) 216 { 217 struct snd_timer_instance *slave; 218 struct list_head *p, *n; 219 220 /* check all pending slaves */ 221 list_for_each_safe(p, n, &snd_timer_slave_list) { 222 slave = list_entry(p, struct snd_timer_instance, open_list); 223 if (slave->slave_class == master->slave_class && 224 slave->slave_id == master->slave_id) { 225 list_del(p); 226 list_add_tail(p, &master->slave_list_head); 227 spin_lock_irq(&slave_active_lock); 228 slave->master = master; 229 slave->timer = master->timer; 230 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 231 list_add_tail(&slave->active_list, 232 &master->slave_active_head); 233 spin_unlock_irq(&slave_active_lock); 234 } 235 } 236 } 237 238 /* 239 * open a timer instance 240 * when opening a master, the slave id must be here given. 241 */ 242 int snd_timer_open(struct snd_timer_instance **ti, 243 char *owner, struct snd_timer_id *tid, 244 unsigned int slave_id) 245 { 246 struct snd_timer *timer; 247 struct snd_timer_instance *timeri = NULL; 248 249 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 250 /* open a slave instance */ 251 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 252 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 253 snd_printd("invalid slave class %i\n", tid->dev_sclass); 254 return -EINVAL; 255 } 256 mutex_lock(®ister_mutex); 257 timeri = snd_timer_instance_new(owner, NULL); 258 if (!timeri) { 259 mutex_unlock(®ister_mutex); 260 return -ENOMEM; 261 } 262 timeri->slave_class = tid->dev_sclass; 263 timeri->slave_id = tid->device; 264 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 265 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 266 snd_timer_check_slave(timeri); 267 mutex_unlock(®ister_mutex); 268 *ti = timeri; 269 return 0; 270 } 271 272 /* open a master instance */ 273 mutex_lock(®ister_mutex); 274 timer = snd_timer_find(tid); 275 #ifdef CONFIG_KMOD 276 if (timer == NULL) { 277 mutex_unlock(®ister_mutex); 278 snd_timer_request(tid); 279 mutex_lock(®ister_mutex); 280 timer = snd_timer_find(tid); 281 } 282 #endif 283 if (!timer) { 284 mutex_unlock(®ister_mutex); 285 return -ENODEV; 286 } 287 if (!list_empty(&timer->open_list_head)) { 288 timeri = list_entry(timer->open_list_head.next, 289 struct snd_timer_instance, open_list); 290 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 291 mutex_unlock(®ister_mutex); 292 return -EBUSY; 293 } 294 } 295 timeri = snd_timer_instance_new(owner, timer); 296 if (!timeri) { 297 mutex_unlock(®ister_mutex); 298 return -ENOMEM; 299 } 300 timeri->slave_class = tid->dev_sclass; 301 timeri->slave_id = slave_id; 302 if (list_empty(&timer->open_list_head) && timer->hw.open) 303 timer->hw.open(timer); 304 list_add_tail(&timeri->open_list, &timer->open_list_head); 305 snd_timer_check_master(timeri); 306 mutex_unlock(®ister_mutex); 307 *ti = timeri; 308 return 0; 309 } 310 311 static int _snd_timer_stop(struct snd_timer_instance *timeri, 312 int keep_flag, int event); 313 314 /* 315 * close a timer instance 316 */ 317 int snd_timer_close(struct snd_timer_instance *timeri) 318 { 319 struct snd_timer *timer = NULL; 320 struct list_head *p, *n; 321 struct snd_timer_instance *slave; 322 323 snd_assert(timeri != NULL, return -ENXIO); 324 325 /* force to stop the timer */ 326 snd_timer_stop(timeri); 327 328 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 329 /* wait, until the active callback is finished */ 330 spin_lock_irq(&slave_active_lock); 331 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 332 spin_unlock_irq(&slave_active_lock); 333 udelay(10); 334 spin_lock_irq(&slave_active_lock); 335 } 336 spin_unlock_irq(&slave_active_lock); 337 mutex_lock(®ister_mutex); 338 list_del(&timeri->open_list); 339 mutex_unlock(®ister_mutex); 340 } else { 341 timer = timeri->timer; 342 /* wait, until the active callback is finished */ 343 spin_lock_irq(&timer->lock); 344 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 345 spin_unlock_irq(&timer->lock); 346 udelay(10); 347 spin_lock_irq(&timer->lock); 348 } 349 spin_unlock_irq(&timer->lock); 350 mutex_lock(®ister_mutex); 351 list_del(&timeri->open_list); 352 if (timer && list_empty(&timer->open_list_head) && 353 timer->hw.close) 354 timer->hw.close(timer); 355 /* remove slave links */ 356 list_for_each_safe(p, n, &timeri->slave_list_head) { 357 slave = list_entry(p, struct snd_timer_instance, open_list); 358 spin_lock_irq(&slave_active_lock); 359 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); 360 list_del(p); 361 list_add_tail(p, &snd_timer_slave_list); 362 slave->master = NULL; 363 slave->timer = NULL; 364 spin_unlock_irq(&slave_active_lock); 365 } 366 mutex_unlock(®ister_mutex); 367 } 368 if (timeri->private_free) 369 timeri->private_free(timeri); 370 kfree(timeri->owner); 371 kfree(timeri); 372 if (timer) 373 module_put(timer->module); 374 return 0; 375 } 376 377 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 378 { 379 struct snd_timer * timer; 380 381 if (timeri == NULL) 382 return 0; 383 if ((timer = timeri->timer) != NULL) { 384 if (timer->hw.c_resolution) 385 return timer->hw.c_resolution(timer); 386 return timer->hw.resolution; 387 } 388 return 0; 389 } 390 391 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 392 { 393 struct snd_timer *timer; 394 unsigned long flags; 395 unsigned long resolution = 0; 396 struct snd_timer_instance *ts; 397 struct list_head *n; 398 struct timespec tstamp; 399 400 getnstimeofday(&tstamp); 401 snd_assert(event >= SNDRV_TIMER_EVENT_START && 402 event <= SNDRV_TIMER_EVENT_PAUSE, return); 403 if (event == SNDRV_TIMER_EVENT_START || 404 event == SNDRV_TIMER_EVENT_CONTINUE) 405 resolution = snd_timer_resolution(ti); 406 if (ti->ccallback) 407 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution); 408 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 409 return; 410 timer = ti->timer; 411 if (timer == NULL) 412 return; 413 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 414 return; 415 spin_lock_irqsave(&timer->lock, flags); 416 list_for_each(n, &ti->slave_active_head) { 417 ts = list_entry(n, struct snd_timer_instance, active_list); 418 if (ts->ccallback) 419 ts->ccallback(ti, event + 100, &tstamp, resolution); 420 } 421 spin_unlock_irqrestore(&timer->lock, flags); 422 } 423 424 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 425 unsigned long sticks) 426 { 427 list_del(&timeri->active_list); 428 list_add_tail(&timeri->active_list, &timer->active_list_head); 429 if (timer->running) { 430 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 431 goto __start_now; 432 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 433 timeri->flags |= SNDRV_TIMER_IFLG_START; 434 return 1; /* delayed start */ 435 } else { 436 timer->sticks = sticks; 437 timer->hw.start(timer); 438 __start_now: 439 timer->running++; 440 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 441 return 0; 442 } 443 } 444 445 static int snd_timer_start_slave(struct snd_timer_instance *timeri) 446 { 447 unsigned long flags; 448 449 spin_lock_irqsave(&slave_active_lock, flags); 450 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 451 if (timeri->master) 452 list_add_tail(&timeri->active_list, 453 &timeri->master->slave_active_head); 454 spin_unlock_irqrestore(&slave_active_lock, flags); 455 return 1; /* delayed start */ 456 } 457 458 /* 459 * start the timer instance 460 */ 461 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 462 { 463 struct snd_timer *timer; 464 int result = -EINVAL; 465 unsigned long flags; 466 467 if (timeri == NULL || ticks < 1) 468 return -EINVAL; 469 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 470 result = snd_timer_start_slave(timeri); 471 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 472 return result; 473 } 474 timer = timeri->timer; 475 if (timer == NULL) 476 return -EINVAL; 477 spin_lock_irqsave(&timer->lock, flags); 478 timeri->ticks = timeri->cticks = ticks; 479 timeri->pticks = 0; 480 result = snd_timer_start1(timer, timeri, ticks); 481 spin_unlock_irqrestore(&timer->lock, flags); 482 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 483 return result; 484 } 485 486 static int _snd_timer_stop(struct snd_timer_instance * timeri, 487 int keep_flag, int event) 488 { 489 struct snd_timer *timer; 490 unsigned long flags; 491 492 snd_assert(timeri != NULL, return -ENXIO); 493 494 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 495 if (!keep_flag) { 496 spin_lock_irqsave(&slave_active_lock, flags); 497 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 498 spin_unlock_irqrestore(&slave_active_lock, flags); 499 } 500 goto __end; 501 } 502 timer = timeri->timer; 503 if (!timer) 504 return -EINVAL; 505 spin_lock_irqsave(&timer->lock, flags); 506 list_del_init(&timeri->ack_list); 507 list_del_init(&timeri->active_list); 508 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 509 !(--timer->running)) { 510 timer->hw.stop(timer); 511 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 512 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 513 snd_timer_reschedule(timer, 0); 514 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 515 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 516 timer->hw.start(timer); 517 } 518 } 519 } 520 if (!keep_flag) 521 timeri->flags &= 522 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 523 spin_unlock_irqrestore(&timer->lock, flags); 524 __end: 525 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 526 snd_timer_notify1(timeri, event); 527 return 0; 528 } 529 530 /* 531 * stop the timer instance. 532 * 533 * do not call this from the timer callback! 534 */ 535 int snd_timer_stop(struct snd_timer_instance *timeri) 536 { 537 struct snd_timer *timer; 538 unsigned long flags; 539 int err; 540 541 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); 542 if (err < 0) 543 return err; 544 timer = timeri->timer; 545 spin_lock_irqsave(&timer->lock, flags); 546 timeri->cticks = timeri->ticks; 547 timeri->pticks = 0; 548 spin_unlock_irqrestore(&timer->lock, flags); 549 return 0; 550 } 551 552 /* 553 * start again.. the tick is kept. 554 */ 555 int snd_timer_continue(struct snd_timer_instance *timeri) 556 { 557 struct snd_timer *timer; 558 int result = -EINVAL; 559 unsigned long flags; 560 561 if (timeri == NULL) 562 return result; 563 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 564 return snd_timer_start_slave(timeri); 565 timer = timeri->timer; 566 if (! timer) 567 return -EINVAL; 568 spin_lock_irqsave(&timer->lock, flags); 569 if (!timeri->cticks) 570 timeri->cticks = 1; 571 timeri->pticks = 0; 572 result = snd_timer_start1(timer, timeri, timer->sticks); 573 spin_unlock_irqrestore(&timer->lock, flags); 574 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 575 return result; 576 } 577 578 /* 579 * pause.. remember the ticks left 580 */ 581 int snd_timer_pause(struct snd_timer_instance * timeri) 582 { 583 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); 584 } 585 586 /* 587 * reschedule the timer 588 * 589 * start pending instances and check the scheduling ticks. 590 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 591 */ 592 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 593 { 594 struct snd_timer_instance *ti; 595 unsigned long ticks = ~0UL; 596 struct list_head *p; 597 598 list_for_each(p, &timer->active_list_head) { 599 ti = list_entry(p, struct snd_timer_instance, active_list); 600 if (ti->flags & SNDRV_TIMER_IFLG_START) { 601 ti->flags &= ~SNDRV_TIMER_IFLG_START; 602 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 603 timer->running++; 604 } 605 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 606 if (ticks > ti->cticks) 607 ticks = ti->cticks; 608 } 609 } 610 if (ticks == ~0UL) { 611 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 612 return; 613 } 614 if (ticks > timer->hw.ticks) 615 ticks = timer->hw.ticks; 616 if (ticks_left != ticks) 617 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 618 timer->sticks = ticks; 619 } 620 621 /* 622 * timer tasklet 623 * 624 */ 625 static void snd_timer_tasklet(unsigned long arg) 626 { 627 struct snd_timer *timer = (struct snd_timer *) arg; 628 struct snd_timer_instance *ti; 629 struct list_head *p; 630 unsigned long resolution, ticks; 631 unsigned long flags; 632 633 spin_lock_irqsave(&timer->lock, flags); 634 /* now process all callbacks */ 635 while (!list_empty(&timer->sack_list_head)) { 636 p = timer->sack_list_head.next; /* get first item */ 637 ti = list_entry(p, struct snd_timer_instance, ack_list); 638 639 /* remove from ack_list and make empty */ 640 list_del_init(p); 641 642 ticks = ti->pticks; 643 ti->pticks = 0; 644 resolution = ti->resolution; 645 646 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 647 spin_unlock(&timer->lock); 648 if (ti->callback) 649 ti->callback(ti, resolution, ticks); 650 spin_lock(&timer->lock); 651 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 652 } 653 spin_unlock_irqrestore(&timer->lock, flags); 654 } 655 656 /* 657 * timer interrupt 658 * 659 * ticks_left is usually equal to timer->sticks. 660 * 661 */ 662 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 663 { 664 struct snd_timer_instance *ti, *ts; 665 unsigned long resolution, ticks; 666 struct list_head *p, *q, *n, *ack_list_head; 667 unsigned long flags; 668 int use_tasklet = 0; 669 670 if (timer == NULL) 671 return; 672 673 spin_lock_irqsave(&timer->lock, flags); 674 675 /* remember the current resolution */ 676 if (timer->hw.c_resolution) 677 resolution = timer->hw.c_resolution(timer); 678 else 679 resolution = timer->hw.resolution; 680 681 /* loop for all active instances 682 * Here we cannot use list_for_each because the active_list of a 683 * processed instance is relinked to done_list_head before the callback 684 * is called. 685 */ 686 list_for_each_safe(p, n, &timer->active_list_head) { 687 ti = list_entry(p, struct snd_timer_instance, active_list); 688 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 689 continue; 690 ti->pticks += ticks_left; 691 ti->resolution = resolution; 692 if (ti->cticks < ticks_left) 693 ti->cticks = 0; 694 else 695 ti->cticks -= ticks_left; 696 if (ti->cticks) /* not expired */ 697 continue; 698 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 699 ti->cticks = ti->ticks; 700 } else { 701 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 702 if (--timer->running) 703 list_del(p); 704 } 705 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 706 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 707 ack_list_head = &timer->ack_list_head; 708 else 709 ack_list_head = &timer->sack_list_head; 710 if (list_empty(&ti->ack_list)) 711 list_add_tail(&ti->ack_list, ack_list_head); 712 list_for_each(q, &ti->slave_active_head) { 713 ts = list_entry(q, struct snd_timer_instance, active_list); 714 ts->pticks = ti->pticks; 715 ts->resolution = resolution; 716 if (list_empty(&ts->ack_list)) 717 list_add_tail(&ts->ack_list, ack_list_head); 718 } 719 } 720 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 721 snd_timer_reschedule(timer, timer->sticks); 722 if (timer->running) { 723 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 724 timer->hw.stop(timer); 725 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 726 } 727 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 728 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 729 /* restart timer */ 730 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 731 timer->hw.start(timer); 732 } 733 } else { 734 timer->hw.stop(timer); 735 } 736 737 /* now process all fast callbacks */ 738 while (!list_empty(&timer->ack_list_head)) { 739 p = timer->ack_list_head.next; /* get first item */ 740 ti = list_entry(p, struct snd_timer_instance, ack_list); 741 742 /* remove from ack_list and make empty */ 743 list_del_init(p); 744 745 ticks = ti->pticks; 746 ti->pticks = 0; 747 748 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 749 spin_unlock(&timer->lock); 750 if (ti->callback) 751 ti->callback(ti, resolution, ticks); 752 spin_lock(&timer->lock); 753 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 754 } 755 756 /* do we have any slow callbacks? */ 757 use_tasklet = !list_empty(&timer->sack_list_head); 758 spin_unlock_irqrestore(&timer->lock, flags); 759 760 if (use_tasklet) 761 tasklet_hi_schedule(&timer->task_queue); 762 } 763 764 /* 765 766 */ 767 768 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 769 struct snd_timer **rtimer) 770 { 771 struct snd_timer *timer; 772 int err; 773 static struct snd_device_ops ops = { 774 .dev_free = snd_timer_dev_free, 775 .dev_register = snd_timer_dev_register, 776 .dev_disconnect = snd_timer_dev_disconnect, 777 }; 778 779 snd_assert(tid != NULL, return -EINVAL); 780 snd_assert(rtimer != NULL, return -EINVAL); 781 *rtimer = NULL; 782 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 783 if (timer == NULL) { 784 snd_printk(KERN_ERR "timer: cannot allocate\n"); 785 return -ENOMEM; 786 } 787 timer->tmr_class = tid->dev_class; 788 timer->card = card; 789 timer->tmr_device = tid->device; 790 timer->tmr_subdevice = tid->subdevice; 791 if (id) 792 strlcpy(timer->id, id, sizeof(timer->id)); 793 INIT_LIST_HEAD(&timer->device_list); 794 INIT_LIST_HEAD(&timer->open_list_head); 795 INIT_LIST_HEAD(&timer->active_list_head); 796 INIT_LIST_HEAD(&timer->ack_list_head); 797 INIT_LIST_HEAD(&timer->sack_list_head); 798 spin_lock_init(&timer->lock); 799 tasklet_init(&timer->task_queue, snd_timer_tasklet, 800 (unsigned long)timer); 801 if (card != NULL) { 802 timer->module = card->module; 803 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 804 if (err < 0) { 805 snd_timer_free(timer); 806 return err; 807 } 808 } 809 *rtimer = timer; 810 return 0; 811 } 812 813 static int snd_timer_free(struct snd_timer *timer) 814 { 815 snd_assert(timer != NULL, return -ENXIO); 816 817 mutex_lock(®ister_mutex); 818 if (! list_empty(&timer->open_list_head)) { 819 struct list_head *p, *n; 820 struct snd_timer_instance *ti; 821 snd_printk(KERN_WARNING "timer %p is busy?\n", timer); 822 list_for_each_safe(p, n, &timer->open_list_head) { 823 list_del_init(p); 824 ti = list_entry(p, struct snd_timer_instance, open_list); 825 ti->timer = NULL; 826 } 827 } 828 list_del(&timer->device_list); 829 mutex_unlock(®ister_mutex); 830 831 if (timer->private_free) 832 timer->private_free(timer); 833 kfree(timer); 834 return 0; 835 } 836 837 static int snd_timer_dev_free(struct snd_device *device) 838 { 839 struct snd_timer *timer = device->device_data; 840 return snd_timer_free(timer); 841 } 842 843 static int snd_timer_dev_register(struct snd_device *dev) 844 { 845 struct snd_timer *timer = dev->device_data; 846 struct snd_timer *timer1; 847 struct list_head *p; 848 849 snd_assert(timer != NULL && timer->hw.start != NULL && 850 timer->hw.stop != NULL, return -ENXIO); 851 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 852 !timer->hw.resolution && timer->hw.c_resolution == NULL) 853 return -EINVAL; 854 855 mutex_lock(®ister_mutex); 856 list_for_each(p, &snd_timer_list) { 857 timer1 = list_entry(p, struct snd_timer, device_list); 858 if (timer1->tmr_class > timer->tmr_class) 859 break; 860 if (timer1->tmr_class < timer->tmr_class) 861 continue; 862 if (timer1->card && timer->card) { 863 if (timer1->card->number > timer->card->number) 864 break; 865 if (timer1->card->number < timer->card->number) 866 continue; 867 } 868 if (timer1->tmr_device > timer->tmr_device) 869 break; 870 if (timer1->tmr_device < timer->tmr_device) 871 continue; 872 if (timer1->tmr_subdevice > timer->tmr_subdevice) 873 break; 874 if (timer1->tmr_subdevice < timer->tmr_subdevice) 875 continue; 876 /* conflicts.. */ 877 mutex_unlock(®ister_mutex); 878 return -EBUSY; 879 } 880 list_add_tail(&timer->device_list, p); 881 mutex_unlock(®ister_mutex); 882 return 0; 883 } 884 885 static int snd_timer_dev_disconnect(struct snd_device *device) 886 { 887 struct snd_timer *timer = device->device_data; 888 mutex_lock(®ister_mutex); 889 list_del_init(&timer->device_list); 890 mutex_unlock(®ister_mutex); 891 return 0; 892 } 893 894 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 895 { 896 unsigned long flags; 897 unsigned long resolution = 0; 898 struct snd_timer_instance *ti, *ts; 899 struct list_head *p, *n; 900 901 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 902 return; 903 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && 904 event <= SNDRV_TIMER_EVENT_MRESUME, return); 905 spin_lock_irqsave(&timer->lock, flags); 906 if (event == SNDRV_TIMER_EVENT_MSTART || 907 event == SNDRV_TIMER_EVENT_MCONTINUE || 908 event == SNDRV_TIMER_EVENT_MRESUME) { 909 if (timer->hw.c_resolution) 910 resolution = timer->hw.c_resolution(timer); 911 else 912 resolution = timer->hw.resolution; 913 } 914 list_for_each(p, &timer->active_list_head) { 915 ti = list_entry(p, struct snd_timer_instance, active_list); 916 if (ti->ccallback) 917 ti->ccallback(ti, event, tstamp, resolution); 918 list_for_each(n, &ti->slave_active_head) { 919 ts = list_entry(n, struct snd_timer_instance, active_list); 920 if (ts->ccallback) 921 ts->ccallback(ts, event, tstamp, resolution); 922 } 923 } 924 spin_unlock_irqrestore(&timer->lock, flags); 925 } 926 927 /* 928 * exported functions for global timers 929 */ 930 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 931 { 932 struct snd_timer_id tid; 933 934 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 935 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 936 tid.card = -1; 937 tid.device = device; 938 tid.subdevice = 0; 939 return snd_timer_new(NULL, id, &tid, rtimer); 940 } 941 942 int snd_timer_global_free(struct snd_timer *timer) 943 { 944 return snd_timer_free(timer); 945 } 946 947 int snd_timer_global_register(struct snd_timer *timer) 948 { 949 struct snd_device dev; 950 951 memset(&dev, 0, sizeof(dev)); 952 dev.device_data = timer; 953 return snd_timer_dev_register(&dev); 954 } 955 956 /* 957 * System timer 958 */ 959 960 struct snd_timer_system_private { 961 struct timer_list tlist; 962 unsigned long last_expires; 963 unsigned long last_jiffies; 964 unsigned long correction; 965 }; 966 967 static void snd_timer_s_function(unsigned long data) 968 { 969 struct snd_timer *timer = (struct snd_timer *)data; 970 struct snd_timer_system_private *priv = timer->private_data; 971 unsigned long jiff = jiffies; 972 if (time_after(jiff, priv->last_expires)) 973 priv->correction += (long)jiff - (long)priv->last_expires; 974 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 975 } 976 977 static int snd_timer_s_start(struct snd_timer * timer) 978 { 979 struct snd_timer_system_private *priv; 980 unsigned long njiff; 981 982 priv = (struct snd_timer_system_private *) timer->private_data; 983 njiff = (priv->last_jiffies = jiffies); 984 if (priv->correction > timer->sticks - 1) { 985 priv->correction -= timer->sticks - 1; 986 njiff++; 987 } else { 988 njiff += timer->sticks - priv->correction; 989 priv->correction = 0; 990 } 991 priv->last_expires = priv->tlist.expires = njiff; 992 add_timer(&priv->tlist); 993 return 0; 994 } 995 996 static int snd_timer_s_stop(struct snd_timer * timer) 997 { 998 struct snd_timer_system_private *priv; 999 unsigned long jiff; 1000 1001 priv = (struct snd_timer_system_private *) timer->private_data; 1002 del_timer(&priv->tlist); 1003 jiff = jiffies; 1004 if (time_before(jiff, priv->last_expires)) 1005 timer->sticks = priv->last_expires - jiff; 1006 else 1007 timer->sticks = 1; 1008 priv->correction = 0; 1009 return 0; 1010 } 1011 1012 static struct snd_timer_hardware snd_timer_system = 1013 { 1014 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1015 .resolution = 1000000000L / HZ, 1016 .ticks = 10000000L, 1017 .start = snd_timer_s_start, 1018 .stop = snd_timer_s_stop 1019 }; 1020 1021 static void snd_timer_free_system(struct snd_timer *timer) 1022 { 1023 kfree(timer->private_data); 1024 } 1025 1026 static int snd_timer_register_system(void) 1027 { 1028 struct snd_timer *timer; 1029 struct snd_timer_system_private *priv; 1030 int err; 1031 1032 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1033 if (err < 0) 1034 return err; 1035 strcpy(timer->name, "system timer"); 1036 timer->hw = snd_timer_system; 1037 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1038 if (priv == NULL) { 1039 snd_timer_free(timer); 1040 return -ENOMEM; 1041 } 1042 init_timer(&priv->tlist); 1043 priv->tlist.function = snd_timer_s_function; 1044 priv->tlist.data = (unsigned long) timer; 1045 timer->private_data = priv; 1046 timer->private_free = snd_timer_free_system; 1047 return snd_timer_global_register(timer); 1048 } 1049 1050 #ifdef CONFIG_PROC_FS 1051 /* 1052 * Info interface 1053 */ 1054 1055 static void snd_timer_proc_read(struct snd_info_entry *entry, 1056 struct snd_info_buffer *buffer) 1057 { 1058 struct snd_timer *timer; 1059 struct snd_timer_instance *ti; 1060 struct list_head *p, *q; 1061 1062 mutex_lock(®ister_mutex); 1063 list_for_each(p, &snd_timer_list) { 1064 timer = list_entry(p, struct snd_timer, device_list); 1065 switch (timer->tmr_class) { 1066 case SNDRV_TIMER_CLASS_GLOBAL: 1067 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1068 break; 1069 case SNDRV_TIMER_CLASS_CARD: 1070 snd_iprintf(buffer, "C%i-%i: ", 1071 timer->card->number, timer->tmr_device); 1072 break; 1073 case SNDRV_TIMER_CLASS_PCM: 1074 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1075 timer->tmr_device, timer->tmr_subdevice); 1076 break; 1077 default: 1078 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1079 timer->card ? timer->card->number : -1, 1080 timer->tmr_device, timer->tmr_subdevice); 1081 } 1082 snd_iprintf(buffer, "%s :", timer->name); 1083 if (timer->hw.resolution) 1084 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1085 timer->hw.resolution / 1000, 1086 timer->hw.resolution % 1000, 1087 timer->hw.ticks); 1088 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1089 snd_iprintf(buffer, " SLAVE"); 1090 snd_iprintf(buffer, "\n"); 1091 list_for_each(q, &timer->open_list_head) { 1092 ti = list_entry(q, struct snd_timer_instance, open_list); 1093 snd_iprintf(buffer, " Client %s : %s\n", 1094 ti->owner ? ti->owner : "unknown", 1095 ti->flags & (SNDRV_TIMER_IFLG_START | 1096 SNDRV_TIMER_IFLG_RUNNING) 1097 ? "running" : "stopped"); 1098 } 1099 } 1100 mutex_unlock(®ister_mutex); 1101 } 1102 1103 static struct snd_info_entry *snd_timer_proc_entry; 1104 1105 static void __init snd_timer_proc_init(void) 1106 { 1107 struct snd_info_entry *entry; 1108 1109 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1110 if (entry != NULL) { 1111 entry->c.text.read = snd_timer_proc_read; 1112 if (snd_info_register(entry) < 0) { 1113 snd_info_free_entry(entry); 1114 entry = NULL; 1115 } 1116 } 1117 snd_timer_proc_entry = entry; 1118 } 1119 1120 static void __exit snd_timer_proc_done(void) 1121 { 1122 snd_info_free_entry(snd_timer_proc_entry); 1123 } 1124 #else /* !CONFIG_PROC_FS */ 1125 #define snd_timer_proc_init() 1126 #define snd_timer_proc_done() 1127 #endif 1128 1129 /* 1130 * USER SPACE interface 1131 */ 1132 1133 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1134 unsigned long resolution, 1135 unsigned long ticks) 1136 { 1137 struct snd_timer_user *tu = timeri->callback_data; 1138 struct snd_timer_read *r; 1139 int prev; 1140 1141 spin_lock(&tu->qlock); 1142 if (tu->qused > 0) { 1143 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1144 r = &tu->queue[prev]; 1145 if (r->resolution == resolution) { 1146 r->ticks += ticks; 1147 goto __wake; 1148 } 1149 } 1150 if (tu->qused >= tu->queue_size) { 1151 tu->overrun++; 1152 } else { 1153 r = &tu->queue[tu->qtail++]; 1154 tu->qtail %= tu->queue_size; 1155 r->resolution = resolution; 1156 r->ticks = ticks; 1157 tu->qused++; 1158 } 1159 __wake: 1160 spin_unlock(&tu->qlock); 1161 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1162 wake_up(&tu->qchange_sleep); 1163 } 1164 1165 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1166 struct snd_timer_tread *tread) 1167 { 1168 if (tu->qused >= tu->queue_size) { 1169 tu->overrun++; 1170 } else { 1171 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1172 tu->qtail %= tu->queue_size; 1173 tu->qused++; 1174 } 1175 } 1176 1177 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1178 int event, 1179 struct timespec *tstamp, 1180 unsigned long resolution) 1181 { 1182 struct snd_timer_user *tu = timeri->callback_data; 1183 struct snd_timer_tread r1; 1184 1185 if (event >= SNDRV_TIMER_EVENT_START && 1186 event <= SNDRV_TIMER_EVENT_PAUSE) 1187 tu->tstamp = *tstamp; 1188 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1189 return; 1190 r1.event = event; 1191 r1.tstamp = *tstamp; 1192 r1.val = resolution; 1193 spin_lock(&tu->qlock); 1194 snd_timer_user_append_to_tqueue(tu, &r1); 1195 spin_unlock(&tu->qlock); 1196 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1197 wake_up(&tu->qchange_sleep); 1198 } 1199 1200 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1201 unsigned long resolution, 1202 unsigned long ticks) 1203 { 1204 struct snd_timer_user *tu = timeri->callback_data; 1205 struct snd_timer_tread *r, r1; 1206 struct timespec tstamp; 1207 int prev, append = 0; 1208 1209 memset(&tstamp, 0, sizeof(tstamp)); 1210 spin_lock(&tu->qlock); 1211 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1212 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1213 spin_unlock(&tu->qlock); 1214 return; 1215 } 1216 if (tu->last_resolution != resolution || ticks > 0) 1217 getnstimeofday(&tstamp); 1218 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1219 tu->last_resolution != resolution) { 1220 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1221 r1.tstamp = tstamp; 1222 r1.val = resolution; 1223 snd_timer_user_append_to_tqueue(tu, &r1); 1224 tu->last_resolution = resolution; 1225 append++; 1226 } 1227 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1228 goto __wake; 1229 if (ticks == 0) 1230 goto __wake; 1231 if (tu->qused > 0) { 1232 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1233 r = &tu->tqueue[prev]; 1234 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1235 r->tstamp = tstamp; 1236 r->val += ticks; 1237 append++; 1238 goto __wake; 1239 } 1240 } 1241 r1.event = SNDRV_TIMER_EVENT_TICK; 1242 r1.tstamp = tstamp; 1243 r1.val = ticks; 1244 snd_timer_user_append_to_tqueue(tu, &r1); 1245 append++; 1246 __wake: 1247 spin_unlock(&tu->qlock); 1248 if (append == 0) 1249 return; 1250 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1251 wake_up(&tu->qchange_sleep); 1252 } 1253 1254 static int snd_timer_user_open(struct inode *inode, struct file *file) 1255 { 1256 struct snd_timer_user *tu; 1257 1258 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1259 if (tu == NULL) 1260 return -ENOMEM; 1261 spin_lock_init(&tu->qlock); 1262 init_waitqueue_head(&tu->qchange_sleep); 1263 mutex_init(&tu->tread_sem); 1264 tu->ticks = 1; 1265 tu->queue_size = 128; 1266 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1267 GFP_KERNEL); 1268 if (tu->queue == NULL) { 1269 kfree(tu); 1270 return -ENOMEM; 1271 } 1272 file->private_data = tu; 1273 return 0; 1274 } 1275 1276 static int snd_timer_user_release(struct inode *inode, struct file *file) 1277 { 1278 struct snd_timer_user *tu; 1279 1280 if (file->private_data) { 1281 tu = file->private_data; 1282 file->private_data = NULL; 1283 fasync_helper(-1, file, 0, &tu->fasync); 1284 if (tu->timeri) 1285 snd_timer_close(tu->timeri); 1286 kfree(tu->queue); 1287 kfree(tu->tqueue); 1288 kfree(tu); 1289 } 1290 return 0; 1291 } 1292 1293 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1294 { 1295 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1296 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1297 id->card = -1; 1298 id->device = -1; 1299 id->subdevice = -1; 1300 } 1301 1302 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1303 { 1304 id->dev_class = timer->tmr_class; 1305 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1306 id->card = timer->card ? timer->card->number : -1; 1307 id->device = timer->tmr_device; 1308 id->subdevice = timer->tmr_subdevice; 1309 } 1310 1311 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1312 { 1313 struct snd_timer_id id; 1314 struct snd_timer *timer; 1315 struct list_head *p; 1316 1317 if (copy_from_user(&id, _tid, sizeof(id))) 1318 return -EFAULT; 1319 mutex_lock(®ister_mutex); 1320 if (id.dev_class < 0) { /* first item */ 1321 if (list_empty(&snd_timer_list)) 1322 snd_timer_user_zero_id(&id); 1323 else { 1324 timer = list_entry(snd_timer_list.next, 1325 struct snd_timer, device_list); 1326 snd_timer_user_copy_id(&id, timer); 1327 } 1328 } else { 1329 switch (id.dev_class) { 1330 case SNDRV_TIMER_CLASS_GLOBAL: 1331 id.device = id.device < 0 ? 0 : id.device + 1; 1332 list_for_each(p, &snd_timer_list) { 1333 timer = list_entry(p, struct snd_timer, device_list); 1334 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1335 snd_timer_user_copy_id(&id, timer); 1336 break; 1337 } 1338 if (timer->tmr_device >= id.device) { 1339 snd_timer_user_copy_id(&id, timer); 1340 break; 1341 } 1342 } 1343 if (p == &snd_timer_list) 1344 snd_timer_user_zero_id(&id); 1345 break; 1346 case SNDRV_TIMER_CLASS_CARD: 1347 case SNDRV_TIMER_CLASS_PCM: 1348 if (id.card < 0) { 1349 id.card = 0; 1350 } else { 1351 if (id.card < 0) { 1352 id.card = 0; 1353 } else { 1354 if (id.device < 0) { 1355 id.device = 0; 1356 } else { 1357 if (id.subdevice < 0) { 1358 id.subdevice = 0; 1359 } else { 1360 id.subdevice++; 1361 } 1362 } 1363 } 1364 } 1365 list_for_each(p, &snd_timer_list) { 1366 timer = list_entry(p, struct snd_timer, device_list); 1367 if (timer->tmr_class > id.dev_class) { 1368 snd_timer_user_copy_id(&id, timer); 1369 break; 1370 } 1371 if (timer->tmr_class < id.dev_class) 1372 continue; 1373 if (timer->card->number > id.card) { 1374 snd_timer_user_copy_id(&id, timer); 1375 break; 1376 } 1377 if (timer->card->number < id.card) 1378 continue; 1379 if (timer->tmr_device > id.device) { 1380 snd_timer_user_copy_id(&id, timer); 1381 break; 1382 } 1383 if (timer->tmr_device < id.device) 1384 continue; 1385 if (timer->tmr_subdevice > id.subdevice) { 1386 snd_timer_user_copy_id(&id, timer); 1387 break; 1388 } 1389 if (timer->tmr_subdevice < id.subdevice) 1390 continue; 1391 snd_timer_user_copy_id(&id, timer); 1392 break; 1393 } 1394 if (p == &snd_timer_list) 1395 snd_timer_user_zero_id(&id); 1396 break; 1397 default: 1398 snd_timer_user_zero_id(&id); 1399 } 1400 } 1401 mutex_unlock(®ister_mutex); 1402 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1403 return -EFAULT; 1404 return 0; 1405 } 1406 1407 static int snd_timer_user_ginfo(struct file *file, 1408 struct snd_timer_ginfo __user *_ginfo) 1409 { 1410 struct snd_timer_ginfo *ginfo; 1411 struct snd_timer_id tid; 1412 struct snd_timer *t; 1413 struct list_head *p; 1414 int err = 0; 1415 1416 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL); 1417 if (! ginfo) 1418 return -ENOMEM; 1419 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) { 1420 kfree(ginfo); 1421 return -EFAULT; 1422 } 1423 tid = ginfo->tid; 1424 memset(ginfo, 0, sizeof(*ginfo)); 1425 ginfo->tid = tid; 1426 mutex_lock(®ister_mutex); 1427 t = snd_timer_find(&tid); 1428 if (t != NULL) { 1429 ginfo->card = t->card ? t->card->number : -1; 1430 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1431 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1432 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1433 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1434 ginfo->resolution = t->hw.resolution; 1435 if (t->hw.resolution_min > 0) { 1436 ginfo->resolution_min = t->hw.resolution_min; 1437 ginfo->resolution_max = t->hw.resolution_max; 1438 } 1439 list_for_each(p, &t->open_list_head) { 1440 ginfo->clients++; 1441 } 1442 } else { 1443 err = -ENODEV; 1444 } 1445 mutex_unlock(®ister_mutex); 1446 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1447 err = -EFAULT; 1448 kfree(ginfo); 1449 return err; 1450 } 1451 1452 static int snd_timer_user_gparams(struct file *file, 1453 struct snd_timer_gparams __user *_gparams) 1454 { 1455 struct snd_timer_gparams gparams; 1456 struct snd_timer *t; 1457 int err; 1458 1459 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1460 return -EFAULT; 1461 mutex_lock(®ister_mutex); 1462 t = snd_timer_find(&gparams.tid); 1463 if (!t) { 1464 err = -ENODEV; 1465 goto _error; 1466 } 1467 if (!list_empty(&t->open_list_head)) { 1468 err = -EBUSY; 1469 goto _error; 1470 } 1471 if (!t->hw.set_period) { 1472 err = -ENOSYS; 1473 goto _error; 1474 } 1475 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1476 _error: 1477 mutex_unlock(®ister_mutex); 1478 return err; 1479 } 1480 1481 static int snd_timer_user_gstatus(struct file *file, 1482 struct snd_timer_gstatus __user *_gstatus) 1483 { 1484 struct snd_timer_gstatus gstatus; 1485 struct snd_timer_id tid; 1486 struct snd_timer *t; 1487 int err = 0; 1488 1489 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1490 return -EFAULT; 1491 tid = gstatus.tid; 1492 memset(&gstatus, 0, sizeof(gstatus)); 1493 gstatus.tid = tid; 1494 mutex_lock(®ister_mutex); 1495 t = snd_timer_find(&tid); 1496 if (t != NULL) { 1497 if (t->hw.c_resolution) 1498 gstatus.resolution = t->hw.c_resolution(t); 1499 else 1500 gstatus.resolution = t->hw.resolution; 1501 if (t->hw.precise_resolution) { 1502 t->hw.precise_resolution(t, &gstatus.resolution_num, 1503 &gstatus.resolution_den); 1504 } else { 1505 gstatus.resolution_num = gstatus.resolution; 1506 gstatus.resolution_den = 1000000000uL; 1507 } 1508 } else { 1509 err = -ENODEV; 1510 } 1511 mutex_unlock(®ister_mutex); 1512 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1513 err = -EFAULT; 1514 return err; 1515 } 1516 1517 static int snd_timer_user_tselect(struct file *file, 1518 struct snd_timer_select __user *_tselect) 1519 { 1520 struct snd_timer_user *tu; 1521 struct snd_timer_select tselect; 1522 char str[32]; 1523 int err = 0; 1524 1525 tu = file->private_data; 1526 mutex_lock(&tu->tread_sem); 1527 if (tu->timeri) { 1528 snd_timer_close(tu->timeri); 1529 tu->timeri = NULL; 1530 } 1531 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1532 err = -EFAULT; 1533 goto __err; 1534 } 1535 sprintf(str, "application %i", current->pid); 1536 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1537 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1538 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1539 if (err < 0) 1540 goto __err; 1541 1542 kfree(tu->queue); 1543 tu->queue = NULL; 1544 kfree(tu->tqueue); 1545 tu->tqueue = NULL; 1546 if (tu->tread) { 1547 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1548 GFP_KERNEL); 1549 if (tu->tqueue == NULL) 1550 err = -ENOMEM; 1551 } else { 1552 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1553 GFP_KERNEL); 1554 if (tu->queue == NULL) 1555 err = -ENOMEM; 1556 } 1557 1558 if (err < 0) { 1559 snd_timer_close(tu->timeri); 1560 tu->timeri = NULL; 1561 } else { 1562 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1563 tu->timeri->callback = tu->tread 1564 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1565 tu->timeri->ccallback = snd_timer_user_ccallback; 1566 tu->timeri->callback_data = (void *)tu; 1567 } 1568 1569 __err: 1570 mutex_unlock(&tu->tread_sem); 1571 return err; 1572 } 1573 1574 static int snd_timer_user_info(struct file *file, 1575 struct snd_timer_info __user *_info) 1576 { 1577 struct snd_timer_user *tu; 1578 struct snd_timer_info *info; 1579 struct snd_timer *t; 1580 int err = 0; 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 1587 info = kzalloc(sizeof(*info), GFP_KERNEL); 1588 if (! info) 1589 return -ENOMEM; 1590 info->card = t->card ? t->card->number : -1; 1591 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1592 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1593 strlcpy(info->id, t->id, sizeof(info->id)); 1594 strlcpy(info->name, t->name, sizeof(info->name)); 1595 info->resolution = t->hw.resolution; 1596 if (copy_to_user(_info, info, sizeof(*_info))) 1597 err = -EFAULT; 1598 kfree(info); 1599 return err; 1600 } 1601 1602 static int snd_timer_user_params(struct file *file, 1603 struct snd_timer_params __user *_params) 1604 { 1605 struct snd_timer_user *tu; 1606 struct snd_timer_params params; 1607 struct snd_timer *t; 1608 struct snd_timer_read *tr; 1609 struct snd_timer_tread *ttr; 1610 int err; 1611 1612 tu = file->private_data; 1613 snd_assert(tu->timeri != NULL, return -ENXIO); 1614 t = tu->timeri->timer; 1615 snd_assert(t != NULL, return -ENXIO); 1616 if (copy_from_user(¶ms, _params, sizeof(params))) 1617 return -EFAULT; 1618 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1619 err = -EINVAL; 1620 goto _end; 1621 } 1622 if (params.queue_size > 0 && 1623 (params.queue_size < 32 || params.queue_size > 1024)) { 1624 err = -EINVAL; 1625 goto _end; 1626 } 1627 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1628 (1<<SNDRV_TIMER_EVENT_TICK)| 1629 (1<<SNDRV_TIMER_EVENT_START)| 1630 (1<<SNDRV_TIMER_EVENT_STOP)| 1631 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1632 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1633 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1634 (1<<SNDRV_TIMER_EVENT_RESUME)| 1635 (1<<SNDRV_TIMER_EVENT_MSTART)| 1636 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1637 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1638 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1639 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1640 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1641 err = -EINVAL; 1642 goto _end; 1643 } 1644 snd_timer_stop(tu->timeri); 1645 spin_lock_irq(&t->lock); 1646 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1647 SNDRV_TIMER_IFLG_EXCLUSIVE| 1648 SNDRV_TIMER_IFLG_EARLY_EVENT); 1649 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1650 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1651 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1652 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1653 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1654 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1655 spin_unlock_irq(&t->lock); 1656 if (params.queue_size > 0 && 1657 (unsigned int)tu->queue_size != params.queue_size) { 1658 if (tu->tread) { 1659 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1660 GFP_KERNEL); 1661 if (ttr) { 1662 kfree(tu->tqueue); 1663 tu->queue_size = params.queue_size; 1664 tu->tqueue = ttr; 1665 } 1666 } else { 1667 tr = kmalloc(params.queue_size * sizeof(*tr), 1668 GFP_KERNEL); 1669 if (tr) { 1670 kfree(tu->queue); 1671 tu->queue_size = params.queue_size; 1672 tu->queue = tr; 1673 } 1674 } 1675 } 1676 tu->qhead = tu->qtail = tu->qused = 0; 1677 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1678 if (tu->tread) { 1679 struct snd_timer_tread tread; 1680 tread.event = SNDRV_TIMER_EVENT_EARLY; 1681 tread.tstamp.tv_sec = 0; 1682 tread.tstamp.tv_nsec = 0; 1683 tread.val = 0; 1684 snd_timer_user_append_to_tqueue(tu, &tread); 1685 } else { 1686 struct snd_timer_read *r = &tu->queue[0]; 1687 r->resolution = 0; 1688 r->ticks = 0; 1689 tu->qused++; 1690 tu->qtail++; 1691 } 1692 } 1693 tu->filter = params.filter; 1694 tu->ticks = params.ticks; 1695 err = 0; 1696 _end: 1697 if (copy_to_user(_params, ¶ms, sizeof(params))) 1698 return -EFAULT; 1699 return err; 1700 } 1701 1702 static int snd_timer_user_status(struct file *file, 1703 struct snd_timer_status __user *_status) 1704 { 1705 struct snd_timer_user *tu; 1706 struct snd_timer_status status; 1707 1708 tu = file->private_data; 1709 snd_assert(tu->timeri != NULL, return -ENXIO); 1710 memset(&status, 0, sizeof(status)); 1711 status.tstamp = tu->tstamp; 1712 status.resolution = snd_timer_resolution(tu->timeri); 1713 status.lost = tu->timeri->lost; 1714 status.overrun = tu->overrun; 1715 spin_lock_irq(&tu->qlock); 1716 status.queue = tu->qused; 1717 spin_unlock_irq(&tu->qlock); 1718 if (copy_to_user(_status, &status, sizeof(status))) 1719 return -EFAULT; 1720 return 0; 1721 } 1722 1723 static int snd_timer_user_start(struct file *file) 1724 { 1725 int err; 1726 struct snd_timer_user *tu; 1727 1728 tu = file->private_data; 1729 snd_assert(tu->timeri != NULL, return -ENXIO); 1730 snd_timer_stop(tu->timeri); 1731 tu->timeri->lost = 0; 1732 tu->last_resolution = 0; 1733 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1734 } 1735 1736 static int snd_timer_user_stop(struct file *file) 1737 { 1738 int err; 1739 struct snd_timer_user *tu; 1740 1741 tu = file->private_data; 1742 snd_assert(tu->timeri != NULL, return -ENXIO); 1743 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1744 } 1745 1746 static int snd_timer_user_continue(struct file *file) 1747 { 1748 int err; 1749 struct snd_timer_user *tu; 1750 1751 tu = file->private_data; 1752 snd_assert(tu->timeri != NULL, return -ENXIO); 1753 tu->timeri->lost = 0; 1754 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1755 } 1756 1757 static int snd_timer_user_pause(struct file *file) 1758 { 1759 int err; 1760 struct snd_timer_user *tu; 1761 1762 tu = file->private_data; 1763 snd_assert(tu->timeri != NULL, return -ENXIO); 1764 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1765 } 1766 1767 enum { 1768 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1769 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1770 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1771 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1772 }; 1773 1774 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1775 unsigned long arg) 1776 { 1777 struct snd_timer_user *tu; 1778 void __user *argp = (void __user *)arg; 1779 int __user *p = argp; 1780 1781 tu = file->private_data; 1782 switch (cmd) { 1783 case SNDRV_TIMER_IOCTL_PVERSION: 1784 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1785 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1786 return snd_timer_user_next_device(argp); 1787 case SNDRV_TIMER_IOCTL_TREAD: 1788 { 1789 int xarg; 1790 1791 mutex_lock(&tu->tread_sem); 1792 if (tu->timeri) { /* too late */ 1793 mutex_unlock(&tu->tread_sem); 1794 return -EBUSY; 1795 } 1796 if (get_user(xarg, p)) { 1797 mutex_unlock(&tu->tread_sem); 1798 return -EFAULT; 1799 } 1800 tu->tread = xarg ? 1 : 0; 1801 mutex_unlock(&tu->tread_sem); 1802 return 0; 1803 } 1804 case SNDRV_TIMER_IOCTL_GINFO: 1805 return snd_timer_user_ginfo(file, argp); 1806 case SNDRV_TIMER_IOCTL_GPARAMS: 1807 return snd_timer_user_gparams(file, argp); 1808 case SNDRV_TIMER_IOCTL_GSTATUS: 1809 return snd_timer_user_gstatus(file, argp); 1810 case SNDRV_TIMER_IOCTL_SELECT: 1811 return snd_timer_user_tselect(file, argp); 1812 case SNDRV_TIMER_IOCTL_INFO: 1813 return snd_timer_user_info(file, argp); 1814 case SNDRV_TIMER_IOCTL_PARAMS: 1815 return snd_timer_user_params(file, argp); 1816 case SNDRV_TIMER_IOCTL_STATUS: 1817 return snd_timer_user_status(file, argp); 1818 case SNDRV_TIMER_IOCTL_START: 1819 case SNDRV_TIMER_IOCTL_START_OLD: 1820 return snd_timer_user_start(file); 1821 case SNDRV_TIMER_IOCTL_STOP: 1822 case SNDRV_TIMER_IOCTL_STOP_OLD: 1823 return snd_timer_user_stop(file); 1824 case SNDRV_TIMER_IOCTL_CONTINUE: 1825 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1826 return snd_timer_user_continue(file); 1827 case SNDRV_TIMER_IOCTL_PAUSE: 1828 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1829 return snd_timer_user_pause(file); 1830 } 1831 return -ENOTTY; 1832 } 1833 1834 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1835 { 1836 struct snd_timer_user *tu; 1837 int err; 1838 1839 tu = file->private_data; 1840 err = fasync_helper(fd, file, on, &tu->fasync); 1841 if (err < 0) 1842 return err; 1843 return 0; 1844 } 1845 1846 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1847 size_t count, loff_t *offset) 1848 { 1849 struct snd_timer_user *tu; 1850 long result = 0, unit; 1851 int err = 0; 1852 1853 tu = file->private_data; 1854 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1855 spin_lock_irq(&tu->qlock); 1856 while ((long)count - result >= unit) { 1857 while (!tu->qused) { 1858 wait_queue_t wait; 1859 1860 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1861 err = -EAGAIN; 1862 break; 1863 } 1864 1865 set_current_state(TASK_INTERRUPTIBLE); 1866 init_waitqueue_entry(&wait, current); 1867 add_wait_queue(&tu->qchange_sleep, &wait); 1868 1869 spin_unlock_irq(&tu->qlock); 1870 schedule(); 1871 spin_lock_irq(&tu->qlock); 1872 1873 remove_wait_queue(&tu->qchange_sleep, &wait); 1874 1875 if (signal_pending(current)) { 1876 err = -ERESTARTSYS; 1877 break; 1878 } 1879 } 1880 1881 spin_unlock_irq(&tu->qlock); 1882 if (err < 0) 1883 goto _error; 1884 1885 if (tu->tread) { 1886 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1887 sizeof(struct snd_timer_tread))) { 1888 err = -EFAULT; 1889 goto _error; 1890 } 1891 } else { 1892 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1893 sizeof(struct snd_timer_read))) { 1894 err = -EFAULT; 1895 goto _error; 1896 } 1897 } 1898 1899 tu->qhead %= tu->queue_size; 1900 1901 result += unit; 1902 buffer += unit; 1903 1904 spin_lock_irq(&tu->qlock); 1905 tu->qused--; 1906 } 1907 spin_unlock_irq(&tu->qlock); 1908 _error: 1909 return result > 0 ? result : err; 1910 } 1911 1912 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1913 { 1914 unsigned int mask; 1915 struct snd_timer_user *tu; 1916 1917 tu = file->private_data; 1918 1919 poll_wait(file, &tu->qchange_sleep, wait); 1920 1921 mask = 0; 1922 if (tu->qused) 1923 mask |= POLLIN | POLLRDNORM; 1924 1925 return mask; 1926 } 1927 1928 #ifdef CONFIG_COMPAT 1929 #include "timer_compat.c" 1930 #else 1931 #define snd_timer_user_ioctl_compat NULL 1932 #endif 1933 1934 static struct file_operations snd_timer_f_ops = 1935 { 1936 .owner = THIS_MODULE, 1937 .read = snd_timer_user_read, 1938 .open = snd_timer_user_open, 1939 .release = snd_timer_user_release, 1940 .poll = snd_timer_user_poll, 1941 .unlocked_ioctl = snd_timer_user_ioctl, 1942 .compat_ioctl = snd_timer_user_ioctl_compat, 1943 .fasync = snd_timer_user_fasync, 1944 }; 1945 1946 /* 1947 * ENTRY functions 1948 */ 1949 1950 static int __init alsa_timer_init(void) 1951 { 1952 int err; 1953 1954 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1955 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 1956 "system timer"); 1957 #endif 1958 1959 if ((err = snd_timer_register_system()) < 0) 1960 snd_printk(KERN_ERR "unable to register system timer (%i)\n", 1961 err); 1962 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 1963 &snd_timer_f_ops, NULL, "timer")) < 0) 1964 snd_printk(KERN_ERR "unable to register timer device (%i)\n", 1965 err); 1966 snd_timer_proc_init(); 1967 return 0; 1968 } 1969 1970 static void __exit alsa_timer_exit(void) 1971 { 1972 struct list_head *p, *n; 1973 1974 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 1975 /* unregister the system timer */ 1976 list_for_each_safe(p, n, &snd_timer_list) { 1977 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list); 1978 snd_timer_free(timer); 1979 } 1980 snd_timer_proc_done(); 1981 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1982 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1983 #endif 1984 } 1985 1986 module_init(alsa_timer_init) 1987 module_exit(alsa_timer_exit) 1988 1989 EXPORT_SYMBOL(snd_timer_open); 1990 EXPORT_SYMBOL(snd_timer_close); 1991 EXPORT_SYMBOL(snd_timer_resolution); 1992 EXPORT_SYMBOL(snd_timer_start); 1993 EXPORT_SYMBOL(snd_timer_stop); 1994 EXPORT_SYMBOL(snd_timer_continue); 1995 EXPORT_SYMBOL(snd_timer_pause); 1996 EXPORT_SYMBOL(snd_timer_new); 1997 EXPORT_SYMBOL(snd_timer_notify); 1998 EXPORT_SYMBOL(snd_timer_global_new); 1999 EXPORT_SYMBOL(snd_timer_global_free); 2000 EXPORT_SYMBOL(snd_timer_global_register); 2001 EXPORT_SYMBOL(snd_timer_interrupt); 2002