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/moduleparam.h> 29 #include <linux/string.h> 30 #include <sound/core.h> 31 #include <sound/timer.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/minors.h> 35 #include <sound/initval.h> 36 #include <linux/kmod.h> 37 #ifdef CONFIG_KERNELD 38 #include <linux/kerneld.h> 39 #endif 40 41 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE) 42 #define DEFAULT_TIMER_LIMIT 3 43 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE) 44 #define DEFAULT_TIMER_LIMIT 2 45 #else 46 #define DEFAULT_TIMER_LIMIT 1 47 #endif 48 49 static int timer_limit = DEFAULT_TIMER_LIMIT; 50 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>"); 51 MODULE_DESCRIPTION("ALSA timer interface"); 52 MODULE_LICENSE("GPL"); 53 module_param(timer_limit, int, 0444); 54 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 55 56 struct snd_timer_user { 57 struct snd_timer_instance *timeri; 58 int tread; /* enhanced read with timestamps and events */ 59 unsigned long ticks; 60 unsigned long overrun; 61 int qhead; 62 int qtail; 63 int qused; 64 int queue_size; 65 struct snd_timer_read *queue; 66 struct snd_timer_tread *tqueue; 67 spinlock_t qlock; 68 unsigned long last_resolution; 69 unsigned int filter; 70 struct timespec tstamp; /* trigger tstamp */ 71 wait_queue_head_t qchange_sleep; 72 struct fasync_struct *fasync; 73 struct semaphore tread_sem; 74 }; 75 76 /* list of timers */ 77 static LIST_HEAD(snd_timer_list); 78 79 /* list of slave instances */ 80 static LIST_HEAD(snd_timer_slave_list); 81 82 /* lock for slave active lists */ 83 static DEFINE_SPINLOCK(slave_active_lock); 84 85 static DECLARE_MUTEX(register_mutex); 86 87 static int snd_timer_free(struct snd_timer *timer); 88 static int snd_timer_dev_free(struct snd_device *device); 89 static int snd_timer_dev_register(struct snd_device *device); 90 static int snd_timer_dev_unregister(struct snd_device *device); 91 92 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 93 94 /* 95 * create a timer instance with the given owner string. 96 * when timer is not NULL, increments the module counter 97 */ 98 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 99 struct snd_timer *timer) 100 { 101 struct snd_timer_instance *timeri; 102 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 103 if (timeri == NULL) 104 return NULL; 105 timeri->owner = kstrdup(owner, GFP_KERNEL); 106 if (! timeri->owner) { 107 kfree(timeri); 108 return NULL; 109 } 110 INIT_LIST_HEAD(&timeri->open_list); 111 INIT_LIST_HEAD(&timeri->active_list); 112 INIT_LIST_HEAD(&timeri->ack_list); 113 INIT_LIST_HEAD(&timeri->slave_list_head); 114 INIT_LIST_HEAD(&timeri->slave_active_head); 115 116 timeri->timer = timer; 117 if (timer && !try_module_get(timer->module)) { 118 kfree(timeri->owner); 119 kfree(timeri); 120 return NULL; 121 } 122 123 return timeri; 124 } 125 126 /* 127 * find a timer instance from the given timer id 128 */ 129 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 130 { 131 struct snd_timer *timer = NULL; 132 struct list_head *p; 133 134 list_for_each(p, &snd_timer_list) { 135 timer = list_entry(p, struct snd_timer, device_list); 136 137 if (timer->tmr_class != tid->dev_class) 138 continue; 139 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 140 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 141 (timer->card == NULL || 142 timer->card->number != tid->card)) 143 continue; 144 if (timer->tmr_device != tid->device) 145 continue; 146 if (timer->tmr_subdevice != tid->subdevice) 147 continue; 148 return timer; 149 } 150 return NULL; 151 } 152 153 #ifdef CONFIG_KMOD 154 155 static void snd_timer_request(struct snd_timer_id *tid) 156 { 157 if (! current->fs->root) 158 return; 159 switch (tid->dev_class) { 160 case SNDRV_TIMER_CLASS_GLOBAL: 161 if (tid->device < timer_limit) 162 request_module("snd-timer-%i", tid->device); 163 break; 164 case SNDRV_TIMER_CLASS_CARD: 165 case SNDRV_TIMER_CLASS_PCM: 166 if (tid->card < snd_ecards_limit) 167 request_module("snd-card-%i", tid->card); 168 break; 169 default: 170 break; 171 } 172 } 173 174 #endif 175 176 /* 177 * look for a master instance matching with the slave id of the given slave. 178 * when found, relink the open_link of the slave. 179 * 180 * call this with register_mutex down. 181 */ 182 static void snd_timer_check_slave(struct snd_timer_instance *slave) 183 { 184 struct snd_timer *timer; 185 struct snd_timer_instance *master; 186 struct list_head *p, *q; 187 188 /* FIXME: it's really dumb to look up all entries.. */ 189 list_for_each(p, &snd_timer_list) { 190 timer = list_entry(p, struct snd_timer, device_list); 191 list_for_each(q, &timer->open_list_head) { 192 master = list_entry(q, struct snd_timer_instance, open_list); 193 if (slave->slave_class == master->slave_class && 194 slave->slave_id == master->slave_id) { 195 list_del(&slave->open_list); 196 list_add_tail(&slave->open_list, 197 &master->slave_list_head); 198 spin_lock_irq(&slave_active_lock); 199 slave->master = master; 200 slave->timer = master->timer; 201 spin_unlock_irq(&slave_active_lock); 202 return; 203 } 204 } 205 } 206 } 207 208 /* 209 * look for slave instances matching with the slave id of the given master. 210 * when found, relink the open_link of slaves. 211 * 212 * call this with register_mutex down. 213 */ 214 static void snd_timer_check_master(struct snd_timer_instance *master) 215 { 216 struct snd_timer_instance *slave; 217 struct list_head *p, *n; 218 219 /* check all pending slaves */ 220 list_for_each_safe(p, n, &snd_timer_slave_list) { 221 slave = list_entry(p, struct snd_timer_instance, open_list); 222 if (slave->slave_class == master->slave_class && 223 slave->slave_id == master->slave_id) { 224 list_del(p); 225 list_add_tail(p, &master->slave_list_head); 226 spin_lock_irq(&slave_active_lock); 227 slave->master = master; 228 slave->timer = master->timer; 229 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 230 list_add_tail(&slave->active_list, 231 &master->slave_active_head); 232 spin_unlock_irq(&slave_active_lock); 233 } 234 } 235 } 236 237 /* 238 * open a timer instance 239 * when opening a master, the slave id must be here given. 240 */ 241 int snd_timer_open(struct snd_timer_instance **ti, 242 char *owner, struct snd_timer_id *tid, 243 unsigned int slave_id) 244 { 245 struct snd_timer *timer; 246 struct snd_timer_instance *timeri = NULL; 247 248 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 249 /* open a slave instance */ 250 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 251 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 252 snd_printd("invalid slave class %i\n", tid->dev_sclass); 253 return -EINVAL; 254 } 255 down(®ister_mutex); 256 timeri = snd_timer_instance_new(owner, NULL); 257 if (!timeri) { 258 up(®ister_mutex); 259 return -ENOMEM; 260 } 261 timeri->slave_class = tid->dev_sclass; 262 timeri->slave_id = tid->device; 263 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 264 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 265 snd_timer_check_slave(timeri); 266 up(®ister_mutex); 267 *ti = timeri; 268 return 0; 269 } 270 271 /* open a master instance */ 272 down(®ister_mutex); 273 timer = snd_timer_find(tid); 274 #ifdef CONFIG_KMOD 275 if (timer == NULL) { 276 up(®ister_mutex); 277 snd_timer_request(tid); 278 down(®ister_mutex); 279 timer = snd_timer_find(tid); 280 } 281 #endif 282 if (!timer) { 283 up(®ister_mutex); 284 return -ENODEV; 285 } 286 if (!list_empty(&timer->open_list_head)) { 287 timeri = list_entry(timer->open_list_head.next, 288 struct snd_timer_instance, open_list); 289 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 290 up(®ister_mutex); 291 return -EBUSY; 292 } 293 } 294 timeri = snd_timer_instance_new(owner, timer); 295 if (!timeri) { 296 up(®ister_mutex); 297 return -ENOMEM; 298 } 299 timeri->slave_class = tid->dev_sclass; 300 timeri->slave_id = slave_id; 301 if (list_empty(&timer->open_list_head) && timer->hw.open) 302 timer->hw.open(timer); 303 list_add_tail(&timeri->open_list, &timer->open_list_head); 304 snd_timer_check_master(timeri); 305 up(®ister_mutex); 306 *ti = timeri; 307 return 0; 308 } 309 310 static int _snd_timer_stop(struct snd_timer_instance *timeri, 311 int keep_flag, int event); 312 313 /* 314 * close a timer instance 315 */ 316 int snd_timer_close(struct snd_timer_instance *timeri) 317 { 318 struct snd_timer *timer = NULL; 319 struct list_head *p, *n; 320 struct snd_timer_instance *slave; 321 322 snd_assert(timeri != NULL, return -ENXIO); 323 324 /* force to stop the timer */ 325 snd_timer_stop(timeri); 326 327 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 328 /* wait, until the active callback is finished */ 329 spin_lock_irq(&slave_active_lock); 330 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 331 spin_unlock_irq(&slave_active_lock); 332 udelay(10); 333 spin_lock_irq(&slave_active_lock); 334 } 335 spin_unlock_irq(&slave_active_lock); 336 down(®ister_mutex); 337 list_del(&timeri->open_list); 338 up(®ister_mutex); 339 } else { 340 timer = timeri->timer; 341 /* wait, until the active callback is finished */ 342 spin_lock_irq(&timer->lock); 343 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 344 spin_unlock_irq(&timer->lock); 345 udelay(10); 346 spin_lock_irq(&timer->lock); 347 } 348 spin_unlock_irq(&timer->lock); 349 down(®ister_mutex); 350 list_del(&timeri->open_list); 351 if (timer && list_empty(&timer->open_list_head) && 352 timer->hw.close) 353 timer->hw.close(timer); 354 /* remove slave links */ 355 list_for_each_safe(p, n, &timeri->slave_list_head) { 356 slave = list_entry(p, struct snd_timer_instance, open_list); 357 spin_lock_irq(&slave_active_lock); 358 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); 359 list_del(p); 360 list_add_tail(p, &snd_timer_slave_list); 361 slave->master = NULL; 362 slave->timer = NULL; 363 spin_unlock_irq(&slave_active_lock); 364 } 365 up(®ister_mutex); 366 } 367 if (timeri->private_free) 368 timeri->private_free(timeri); 369 kfree(timeri->owner); 370 kfree(timeri); 371 if (timer) 372 module_put(timer->module); 373 return 0; 374 } 375 376 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 377 { 378 struct snd_timer * timer; 379 380 if (timeri == NULL) 381 return 0; 382 if ((timer = timeri->timer) != NULL) { 383 if (timer->hw.c_resolution) 384 return timer->hw.c_resolution(timer); 385 return timer->hw.resolution; 386 } 387 return 0; 388 } 389 390 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 391 { 392 struct snd_timer *timer; 393 unsigned long flags; 394 unsigned long resolution = 0; 395 struct snd_timer_instance *ts; 396 struct list_head *n; 397 struct timespec tstamp; 398 399 getnstimeofday(&tstamp); 400 snd_assert(event >= SNDRV_TIMER_EVENT_START && 401 event <= SNDRV_TIMER_EVENT_PAUSE, return); 402 if (event == SNDRV_TIMER_EVENT_START || 403 event == SNDRV_TIMER_EVENT_CONTINUE) 404 resolution = snd_timer_resolution(ti); 405 if (ti->ccallback) 406 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution); 407 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 408 return; 409 timer = ti->timer; 410 if (timer == NULL) 411 return; 412 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 413 return; 414 spin_lock_irqsave(&timer->lock, flags); 415 list_for_each(n, &ti->slave_active_head) { 416 ts = list_entry(n, struct snd_timer_instance, active_list); 417 if (ts->ccallback) 418 ts->ccallback(ti, event + 100, &tstamp, resolution); 419 } 420 spin_unlock_irqrestore(&timer->lock, flags); 421 } 422 423 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 424 unsigned long sticks) 425 { 426 list_del(&timeri->active_list); 427 list_add_tail(&timeri->active_list, &timer->active_list_head); 428 if (timer->running) { 429 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 430 goto __start_now; 431 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 432 timeri->flags |= SNDRV_TIMER_IFLG_START; 433 return 1; /* delayed start */ 434 } else { 435 timer->sticks = sticks; 436 timer->hw.start(timer); 437 __start_now: 438 timer->running++; 439 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 440 return 0; 441 } 442 } 443 444 static int snd_timer_start_slave(struct snd_timer_instance *timeri) 445 { 446 unsigned long flags; 447 448 spin_lock_irqsave(&slave_active_lock, flags); 449 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 450 if (timeri->master) 451 list_add_tail(&timeri->active_list, 452 &timeri->master->slave_active_head); 453 spin_unlock_irqrestore(&slave_active_lock, flags); 454 return 1; /* delayed start */ 455 } 456 457 /* 458 * start the timer instance 459 */ 460 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 461 { 462 struct snd_timer *timer; 463 int result = -EINVAL; 464 unsigned long flags; 465 466 if (timeri == NULL || ticks < 1) 467 return -EINVAL; 468 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 469 result = snd_timer_start_slave(timeri); 470 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 471 return result; 472 } 473 timer = timeri->timer; 474 if (timer == NULL) 475 return -EINVAL; 476 spin_lock_irqsave(&timer->lock, flags); 477 timeri->ticks = timeri->cticks = ticks; 478 timeri->pticks = 0; 479 result = snd_timer_start1(timer, timeri, ticks); 480 spin_unlock_irqrestore(&timer->lock, flags); 481 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 482 return result; 483 } 484 485 static int _snd_timer_stop(struct snd_timer_instance * timeri, 486 int keep_flag, int event) 487 { 488 struct snd_timer *timer; 489 unsigned long flags; 490 491 snd_assert(timeri != NULL, return -ENXIO); 492 493 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 494 if (!keep_flag) { 495 spin_lock_irqsave(&slave_active_lock, flags); 496 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 497 spin_unlock_irqrestore(&slave_active_lock, flags); 498 } 499 goto __end; 500 } 501 timer = timeri->timer; 502 if (!timer) 503 return -EINVAL; 504 spin_lock_irqsave(&timer->lock, flags); 505 list_del_init(&timeri->ack_list); 506 list_del_init(&timeri->active_list); 507 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 508 !(--timer->running)) { 509 timer->hw.stop(timer); 510 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 511 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 512 snd_timer_reschedule(timer, 0); 513 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 514 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 515 timer->hw.start(timer); 516 } 517 } 518 } 519 if (!keep_flag) 520 timeri->flags &= 521 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 522 spin_unlock_irqrestore(&timer->lock, flags); 523 __end: 524 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 525 snd_timer_notify1(timeri, event); 526 return 0; 527 } 528 529 /* 530 * stop the timer instance. 531 * 532 * do not call this from the timer callback! 533 */ 534 int snd_timer_stop(struct snd_timer_instance *timeri) 535 { 536 struct snd_timer *timer; 537 unsigned long flags; 538 int err; 539 540 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); 541 if (err < 0) 542 return err; 543 timer = timeri->timer; 544 spin_lock_irqsave(&timer->lock, flags); 545 timeri->cticks = timeri->ticks; 546 timeri->pticks = 0; 547 spin_unlock_irqrestore(&timer->lock, flags); 548 return 0; 549 } 550 551 /* 552 * start again.. the tick is kept. 553 */ 554 int snd_timer_continue(struct snd_timer_instance *timeri) 555 { 556 struct snd_timer *timer; 557 int result = -EINVAL; 558 unsigned long flags; 559 560 if (timeri == NULL) 561 return result; 562 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 563 return snd_timer_start_slave(timeri); 564 timer = timeri->timer; 565 if (! timer) 566 return -EINVAL; 567 spin_lock_irqsave(&timer->lock, flags); 568 if (!timeri->cticks) 569 timeri->cticks = 1; 570 timeri->pticks = 0; 571 result = snd_timer_start1(timer, timeri, timer->sticks); 572 spin_unlock_irqrestore(&timer->lock, flags); 573 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 574 return result; 575 } 576 577 /* 578 * pause.. remember the ticks left 579 */ 580 int snd_timer_pause(struct snd_timer_instance * timeri) 581 { 582 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); 583 } 584 585 /* 586 * reschedule the timer 587 * 588 * start pending instances and check the scheduling ticks. 589 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 590 */ 591 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 592 { 593 struct snd_timer_instance *ti; 594 unsigned long ticks = ~0UL; 595 struct list_head *p; 596 597 list_for_each(p, &timer->active_list_head) { 598 ti = list_entry(p, struct snd_timer_instance, active_list); 599 if (ti->flags & SNDRV_TIMER_IFLG_START) { 600 ti->flags &= ~SNDRV_TIMER_IFLG_START; 601 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 602 timer->running++; 603 } 604 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 605 if (ticks > ti->cticks) 606 ticks = ti->cticks; 607 } 608 } 609 if (ticks == ~0UL) { 610 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 611 return; 612 } 613 if (ticks > timer->hw.ticks) 614 ticks = timer->hw.ticks; 615 if (ticks_left != ticks) 616 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 617 timer->sticks = ticks; 618 } 619 620 /* 621 * timer tasklet 622 * 623 */ 624 static void snd_timer_tasklet(unsigned long arg) 625 { 626 struct snd_timer *timer = (struct snd_timer *) arg; 627 struct snd_timer_instance *ti; 628 struct list_head *p; 629 unsigned long resolution, ticks; 630 631 spin_lock(&timer->lock); 632 /* now process all callbacks */ 633 while (!list_empty(&timer->sack_list_head)) { 634 p = timer->sack_list_head.next; /* get first item */ 635 ti = list_entry(p, struct snd_timer_instance, ack_list); 636 637 /* remove from ack_list and make empty */ 638 list_del_init(p); 639 640 ticks = ti->pticks; 641 ti->pticks = 0; 642 resolution = ti->resolution; 643 644 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 645 spin_unlock(&timer->lock); 646 if (ti->callback) 647 ti->callback(ti, resolution, ticks); 648 spin_lock(&timer->lock); 649 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 650 } 651 spin_unlock(&timer->lock); 652 } 653 654 /* 655 * timer interrupt 656 * 657 * ticks_left is usually equal to timer->sticks. 658 * 659 */ 660 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 661 { 662 struct snd_timer_instance *ti, *ts; 663 unsigned long resolution, ticks; 664 struct list_head *p, *q, *n, *ack_list_head; 665 unsigned long flags; 666 int use_tasklet = 0; 667 668 if (timer == NULL) 669 return; 670 671 spin_lock_irqsave(&timer->lock, flags); 672 673 /* remember the current resolution */ 674 if (timer->hw.c_resolution) 675 resolution = timer->hw.c_resolution(timer); 676 else 677 resolution = timer->hw.resolution; 678 679 /* loop for all active instances 680 * Here we cannot use list_for_each because the active_list of a 681 * processed instance is relinked to done_list_head before the callback 682 * is called. 683 */ 684 list_for_each_safe(p, n, &timer->active_list_head) { 685 ti = list_entry(p, struct snd_timer_instance, active_list); 686 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 687 continue; 688 ti->pticks += ticks_left; 689 ti->resolution = resolution; 690 if (ti->cticks < ticks_left) 691 ti->cticks = 0; 692 else 693 ti->cticks -= ticks_left; 694 if (ti->cticks) /* not expired */ 695 continue; 696 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 697 ti->cticks = ti->ticks; 698 } else { 699 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 700 if (--timer->running) 701 list_del(p); 702 } 703 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 704 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 705 ack_list_head = &timer->ack_list_head; 706 else 707 ack_list_head = &timer->sack_list_head; 708 if (list_empty(&ti->ack_list)) 709 list_add_tail(&ti->ack_list, ack_list_head); 710 list_for_each(q, &ti->slave_active_head) { 711 ts = list_entry(q, struct snd_timer_instance, active_list); 712 ts->pticks = ti->pticks; 713 ts->resolution = resolution; 714 if (list_empty(&ts->ack_list)) 715 list_add_tail(&ts->ack_list, ack_list_head); 716 } 717 } 718 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 719 snd_timer_reschedule(timer, ticks_left); 720 if (timer->running) { 721 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 722 timer->hw.stop(timer); 723 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 724 } 725 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 726 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 727 /* restart timer */ 728 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 729 timer->hw.start(timer); 730 } 731 } else { 732 timer->hw.stop(timer); 733 } 734 735 /* now process all fast callbacks */ 736 while (!list_empty(&timer->ack_list_head)) { 737 p = timer->ack_list_head.next; /* get first item */ 738 ti = list_entry(p, struct snd_timer_instance, ack_list); 739 740 /* remove from ack_list and make empty */ 741 list_del_init(p); 742 743 ticks = ti->pticks; 744 ti->pticks = 0; 745 746 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 747 spin_unlock(&timer->lock); 748 if (ti->callback) 749 ti->callback(ti, resolution, ticks); 750 spin_lock(&timer->lock); 751 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 752 } 753 754 /* do we have any slow callbacks? */ 755 use_tasklet = !list_empty(&timer->sack_list_head); 756 spin_unlock_irqrestore(&timer->lock, flags); 757 758 if (use_tasklet) 759 tasklet_hi_schedule(&timer->task_queue); 760 } 761 762 /* 763 764 */ 765 766 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 767 struct snd_timer **rtimer) 768 { 769 struct snd_timer *timer; 770 int err; 771 static struct snd_device_ops ops = { 772 .dev_free = snd_timer_dev_free, 773 .dev_register = snd_timer_dev_register, 774 .dev_unregister = snd_timer_dev_unregister 775 }; 776 777 snd_assert(tid != NULL, return -EINVAL); 778 snd_assert(rtimer != NULL, return -EINVAL); 779 *rtimer = NULL; 780 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 781 if (timer == NULL) { 782 snd_printk(KERN_ERR "timer: cannot allocate\n"); 783 return -ENOMEM; 784 } 785 timer->tmr_class = tid->dev_class; 786 timer->card = card; 787 timer->tmr_device = tid->device; 788 timer->tmr_subdevice = tid->subdevice; 789 if (id) 790 strlcpy(timer->id, id, sizeof(timer->id)); 791 INIT_LIST_HEAD(&timer->device_list); 792 INIT_LIST_HEAD(&timer->open_list_head); 793 INIT_LIST_HEAD(&timer->active_list_head); 794 INIT_LIST_HEAD(&timer->ack_list_head); 795 INIT_LIST_HEAD(&timer->sack_list_head); 796 spin_lock_init(&timer->lock); 797 tasklet_init(&timer->task_queue, snd_timer_tasklet, 798 (unsigned long)timer); 799 if (card != NULL) { 800 timer->module = card->module; 801 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 802 if (err < 0) { 803 snd_timer_free(timer); 804 return err; 805 } 806 } 807 *rtimer = timer; 808 return 0; 809 } 810 811 static int snd_timer_free(struct snd_timer *timer) 812 { 813 snd_assert(timer != NULL, return -ENXIO); 814 if (timer->private_free) 815 timer->private_free(timer); 816 kfree(timer); 817 return 0; 818 } 819 820 static int snd_timer_dev_free(struct snd_device *device) 821 { 822 struct snd_timer *timer = device->device_data; 823 return snd_timer_free(timer); 824 } 825 826 static int snd_timer_dev_register(struct snd_device *dev) 827 { 828 struct snd_timer *timer = dev->device_data; 829 struct snd_timer *timer1; 830 struct list_head *p; 831 832 snd_assert(timer != NULL && timer->hw.start != NULL && 833 timer->hw.stop != NULL, return -ENXIO); 834 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 835 !timer->hw.resolution && timer->hw.c_resolution == NULL) 836 return -EINVAL; 837 838 down(®ister_mutex); 839 list_for_each(p, &snd_timer_list) { 840 timer1 = list_entry(p, struct snd_timer, device_list); 841 if (timer1->tmr_class > timer->tmr_class) 842 break; 843 if (timer1->tmr_class < timer->tmr_class) 844 continue; 845 if (timer1->card && timer->card) { 846 if (timer1->card->number > timer->card->number) 847 break; 848 if (timer1->card->number < timer->card->number) 849 continue; 850 } 851 if (timer1->tmr_device > timer->tmr_device) 852 break; 853 if (timer1->tmr_device < timer->tmr_device) 854 continue; 855 if (timer1->tmr_subdevice > timer->tmr_subdevice) 856 break; 857 if (timer1->tmr_subdevice < timer->tmr_subdevice) 858 continue; 859 /* conflicts.. */ 860 up(®ister_mutex); 861 return -EBUSY; 862 } 863 list_add_tail(&timer->device_list, p); 864 up(®ister_mutex); 865 return 0; 866 } 867 868 static int snd_timer_unregister(struct snd_timer *timer) 869 { 870 struct list_head *p, *n; 871 struct snd_timer_instance *ti; 872 873 snd_assert(timer != NULL, return -ENXIO); 874 down(®ister_mutex); 875 if (! list_empty(&timer->open_list_head)) { 876 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer); 877 list_for_each_safe(p, n, &timer->open_list_head) { 878 list_del_init(p); 879 ti = list_entry(p, struct snd_timer_instance, open_list); 880 ti->timer = NULL; 881 } 882 } 883 list_del(&timer->device_list); 884 up(®ister_mutex); 885 return snd_timer_free(timer); 886 } 887 888 static int snd_timer_dev_unregister(struct snd_device *device) 889 { 890 struct snd_timer *timer = device->device_data; 891 return snd_timer_unregister(timer); 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 int snd_timer_global_unregister(struct snd_timer *timer) 957 { 958 return snd_timer_unregister(timer); 959 } 960 961 /* 962 * System timer 963 */ 964 965 struct snd_timer_system_private { 966 struct timer_list tlist; 967 struct timer * timer; 968 unsigned long last_expires; 969 unsigned long last_jiffies; 970 unsigned long correction; 971 }; 972 973 static void snd_timer_s_function(unsigned long data) 974 { 975 struct snd_timer *timer = (struct snd_timer *)data; 976 struct snd_timer_system_private *priv = timer->private_data; 977 unsigned long jiff = jiffies; 978 if (time_after(jiff, priv->last_expires)) 979 priv->correction = (long)jiff - (long)priv->last_expires; 980 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 981 } 982 983 static int snd_timer_s_start(struct snd_timer * timer) 984 { 985 struct snd_timer_system_private *priv; 986 unsigned long njiff; 987 988 priv = (struct snd_timer_system_private *) timer->private_data; 989 njiff = (priv->last_jiffies = jiffies); 990 if (priv->correction > timer->sticks - 1) { 991 priv->correction -= timer->sticks - 1; 992 njiff++; 993 } else { 994 njiff += timer->sticks - priv->correction; 995 priv->correction -= timer->sticks; 996 } 997 priv->last_expires = priv->tlist.expires = njiff; 998 add_timer(&priv->tlist); 999 return 0; 1000 } 1001 1002 static int snd_timer_s_stop(struct snd_timer * timer) 1003 { 1004 struct snd_timer_system_private *priv; 1005 unsigned long jiff; 1006 1007 priv = (struct snd_timer_system_private *) timer->private_data; 1008 del_timer(&priv->tlist); 1009 jiff = jiffies; 1010 if (time_before(jiff, priv->last_expires)) 1011 timer->sticks = priv->last_expires - jiff; 1012 else 1013 timer->sticks = 1; 1014 return 0; 1015 } 1016 1017 static struct snd_timer_hardware snd_timer_system = 1018 { 1019 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1020 .resolution = 1000000000L / HZ, 1021 .ticks = 10000000L, 1022 .start = snd_timer_s_start, 1023 .stop = snd_timer_s_stop 1024 }; 1025 1026 static void snd_timer_free_system(struct snd_timer *timer) 1027 { 1028 kfree(timer->private_data); 1029 } 1030 1031 static int snd_timer_register_system(void) 1032 { 1033 struct snd_timer *timer; 1034 struct snd_timer_system_private *priv; 1035 int err; 1036 1037 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1038 if (err < 0) 1039 return err; 1040 strcpy(timer->name, "system timer"); 1041 timer->hw = snd_timer_system; 1042 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1043 if (priv == NULL) { 1044 snd_timer_free(timer); 1045 return -ENOMEM; 1046 } 1047 init_timer(&priv->tlist); 1048 priv->tlist.function = snd_timer_s_function; 1049 priv->tlist.data = (unsigned long) timer; 1050 timer->private_data = priv; 1051 timer->private_free = snd_timer_free_system; 1052 return snd_timer_global_register(timer); 1053 } 1054 1055 #ifdef CONFIG_PROC_FS 1056 /* 1057 * Info interface 1058 */ 1059 1060 static void snd_timer_proc_read(struct snd_info_entry *entry, 1061 struct snd_info_buffer *buffer) 1062 { 1063 unsigned long flags; 1064 struct snd_timer *timer; 1065 struct snd_timer_instance *ti; 1066 struct list_head *p, *q; 1067 1068 down(®ister_mutex); 1069 list_for_each(p, &snd_timer_list) { 1070 timer = list_entry(p, struct snd_timer, device_list); 1071 switch (timer->tmr_class) { 1072 case SNDRV_TIMER_CLASS_GLOBAL: 1073 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1074 break; 1075 case SNDRV_TIMER_CLASS_CARD: 1076 snd_iprintf(buffer, "C%i-%i: ", 1077 timer->card->number, timer->tmr_device); 1078 break; 1079 case SNDRV_TIMER_CLASS_PCM: 1080 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1081 timer->tmr_device, timer->tmr_subdevice); 1082 break; 1083 default: 1084 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1085 timer->card ? timer->card->number : -1, 1086 timer->tmr_device, timer->tmr_subdevice); 1087 } 1088 snd_iprintf(buffer, "%s :", timer->name); 1089 if (timer->hw.resolution) 1090 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1091 timer->hw.resolution / 1000, 1092 timer->hw.resolution % 1000, 1093 timer->hw.ticks); 1094 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1095 snd_iprintf(buffer, " SLAVE"); 1096 snd_iprintf(buffer, "\n"); 1097 spin_lock_irqsave(&timer->lock, flags); 1098 list_for_each(q, &timer->open_list_head) { 1099 ti = list_entry(q, struct snd_timer_instance, open_list); 1100 snd_iprintf(buffer, " Client %s : %s\n", 1101 ti->owner ? ti->owner : "unknown", 1102 ti->flags & (SNDRV_TIMER_IFLG_START | 1103 SNDRV_TIMER_IFLG_RUNNING) 1104 ? "running" : "stopped"); 1105 } 1106 spin_unlock_irqrestore(&timer->lock, flags); 1107 } 1108 up(®ister_mutex); 1109 } 1110 1111 static struct snd_info_entry *snd_timer_proc_entry = NULL; 1112 1113 static void __init snd_timer_proc_init(void) 1114 { 1115 struct snd_info_entry *entry; 1116 1117 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1118 if (entry != NULL) { 1119 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128; 1120 entry->c.text.read = snd_timer_proc_read; 1121 if (snd_info_register(entry) < 0) { 1122 snd_info_free_entry(entry); 1123 entry = NULL; 1124 } 1125 } 1126 snd_timer_proc_entry = entry; 1127 } 1128 1129 static void __exit snd_timer_proc_done(void) 1130 { 1131 snd_info_unregister(snd_timer_proc_entry); 1132 } 1133 #else /* !CONFIG_PROC_FS */ 1134 #define snd_timer_proc_init() 1135 #define snd_timer_proc_done() 1136 #endif 1137 1138 /* 1139 * USER SPACE interface 1140 */ 1141 1142 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1143 unsigned long resolution, 1144 unsigned long ticks) 1145 { 1146 struct snd_timer_user *tu = timeri->callback_data; 1147 struct snd_timer_read *r; 1148 int prev; 1149 1150 spin_lock(&tu->qlock); 1151 if (tu->qused > 0) { 1152 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1153 r = &tu->queue[prev]; 1154 if (r->resolution == resolution) { 1155 r->ticks += ticks; 1156 goto __wake; 1157 } 1158 } 1159 if (tu->qused >= tu->queue_size) { 1160 tu->overrun++; 1161 } else { 1162 r = &tu->queue[tu->qtail++]; 1163 tu->qtail %= tu->queue_size; 1164 r->resolution = resolution; 1165 r->ticks = ticks; 1166 tu->qused++; 1167 } 1168 __wake: 1169 spin_unlock(&tu->qlock); 1170 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1171 wake_up(&tu->qchange_sleep); 1172 } 1173 1174 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1175 struct snd_timer_tread *tread) 1176 { 1177 if (tu->qused >= tu->queue_size) { 1178 tu->overrun++; 1179 } else { 1180 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1181 tu->qtail %= tu->queue_size; 1182 tu->qused++; 1183 } 1184 } 1185 1186 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1187 int event, 1188 struct timespec *tstamp, 1189 unsigned long resolution) 1190 { 1191 struct snd_timer_user *tu = timeri->callback_data; 1192 struct snd_timer_tread r1; 1193 1194 if (event >= SNDRV_TIMER_EVENT_START && 1195 event <= SNDRV_TIMER_EVENT_PAUSE) 1196 tu->tstamp = *tstamp; 1197 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1198 return; 1199 r1.event = event; 1200 r1.tstamp = *tstamp; 1201 r1.val = resolution; 1202 spin_lock(&tu->qlock); 1203 snd_timer_user_append_to_tqueue(tu, &r1); 1204 spin_unlock(&tu->qlock); 1205 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1206 wake_up(&tu->qchange_sleep); 1207 } 1208 1209 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1210 unsigned long resolution, 1211 unsigned long ticks) 1212 { 1213 struct snd_timer_user *tu = timeri->callback_data; 1214 struct snd_timer_tread *r, r1; 1215 struct timespec tstamp; 1216 int prev, append = 0; 1217 1218 memset(&tstamp, 0, sizeof(tstamp)); 1219 spin_lock(&tu->qlock); 1220 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1221 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1222 spin_unlock(&tu->qlock); 1223 return; 1224 } 1225 if (tu->last_resolution != resolution || ticks > 0) 1226 getnstimeofday(&tstamp); 1227 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1228 tu->last_resolution != resolution) { 1229 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1230 r1.tstamp = tstamp; 1231 r1.val = resolution; 1232 snd_timer_user_append_to_tqueue(tu, &r1); 1233 tu->last_resolution = resolution; 1234 append++; 1235 } 1236 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1237 goto __wake; 1238 if (ticks == 0) 1239 goto __wake; 1240 if (tu->qused > 0) { 1241 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1242 r = &tu->tqueue[prev]; 1243 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1244 r->tstamp = tstamp; 1245 r->val += ticks; 1246 append++; 1247 goto __wake; 1248 } 1249 } 1250 r1.event = SNDRV_TIMER_EVENT_TICK; 1251 r1.tstamp = tstamp; 1252 r1.val = ticks; 1253 snd_timer_user_append_to_tqueue(tu, &r1); 1254 append++; 1255 __wake: 1256 spin_unlock(&tu->qlock); 1257 if (append == 0) 1258 return; 1259 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1260 wake_up(&tu->qchange_sleep); 1261 } 1262 1263 static int snd_timer_user_open(struct inode *inode, struct file *file) 1264 { 1265 struct snd_timer_user *tu; 1266 1267 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1268 if (tu == NULL) 1269 return -ENOMEM; 1270 spin_lock_init(&tu->qlock); 1271 init_waitqueue_head(&tu->qchange_sleep); 1272 init_MUTEX(&tu->tread_sem); 1273 tu->ticks = 1; 1274 tu->queue_size = 128; 1275 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1276 GFP_KERNEL); 1277 if (tu->queue == NULL) { 1278 kfree(tu); 1279 return -ENOMEM; 1280 } 1281 file->private_data = tu; 1282 return 0; 1283 } 1284 1285 static int snd_timer_user_release(struct inode *inode, struct file *file) 1286 { 1287 struct snd_timer_user *tu; 1288 1289 if (file->private_data) { 1290 tu = file->private_data; 1291 file->private_data = NULL; 1292 fasync_helper(-1, file, 0, &tu->fasync); 1293 if (tu->timeri) 1294 snd_timer_close(tu->timeri); 1295 kfree(tu->queue); 1296 kfree(tu->tqueue); 1297 kfree(tu); 1298 } 1299 return 0; 1300 } 1301 1302 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1303 { 1304 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1305 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1306 id->card = -1; 1307 id->device = -1; 1308 id->subdevice = -1; 1309 } 1310 1311 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1312 { 1313 id->dev_class = timer->tmr_class; 1314 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1315 id->card = timer->card ? timer->card->number : -1; 1316 id->device = timer->tmr_device; 1317 id->subdevice = timer->tmr_subdevice; 1318 } 1319 1320 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1321 { 1322 struct snd_timer_id id; 1323 struct snd_timer *timer; 1324 struct list_head *p; 1325 1326 if (copy_from_user(&id, _tid, sizeof(id))) 1327 return -EFAULT; 1328 down(®ister_mutex); 1329 if (id.dev_class < 0) { /* first item */ 1330 if (list_empty(&snd_timer_list)) 1331 snd_timer_user_zero_id(&id); 1332 else { 1333 timer = list_entry(snd_timer_list.next, 1334 struct snd_timer, device_list); 1335 snd_timer_user_copy_id(&id, timer); 1336 } 1337 } else { 1338 switch (id.dev_class) { 1339 case SNDRV_TIMER_CLASS_GLOBAL: 1340 id.device = id.device < 0 ? 0 : id.device + 1; 1341 list_for_each(p, &snd_timer_list) { 1342 timer = list_entry(p, struct snd_timer, device_list); 1343 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1344 snd_timer_user_copy_id(&id, timer); 1345 break; 1346 } 1347 if (timer->tmr_device >= id.device) { 1348 snd_timer_user_copy_id(&id, timer); 1349 break; 1350 } 1351 } 1352 if (p == &snd_timer_list) 1353 snd_timer_user_zero_id(&id); 1354 break; 1355 case SNDRV_TIMER_CLASS_CARD: 1356 case SNDRV_TIMER_CLASS_PCM: 1357 if (id.card < 0) { 1358 id.card = 0; 1359 } else { 1360 if (id.card < 0) { 1361 id.card = 0; 1362 } else { 1363 if (id.device < 0) { 1364 id.device = 0; 1365 } else { 1366 if (id.subdevice < 0) { 1367 id.subdevice = 0; 1368 } else { 1369 id.subdevice++; 1370 } 1371 } 1372 } 1373 } 1374 list_for_each(p, &snd_timer_list) { 1375 timer = list_entry(p, struct snd_timer, device_list); 1376 if (timer->tmr_class > id.dev_class) { 1377 snd_timer_user_copy_id(&id, timer); 1378 break; 1379 } 1380 if (timer->tmr_class < id.dev_class) 1381 continue; 1382 if (timer->card->number > id.card) { 1383 snd_timer_user_copy_id(&id, timer); 1384 break; 1385 } 1386 if (timer->card->number < id.card) 1387 continue; 1388 if (timer->tmr_device > id.device) { 1389 snd_timer_user_copy_id(&id, timer); 1390 break; 1391 } 1392 if (timer->tmr_device < id.device) 1393 continue; 1394 if (timer->tmr_subdevice > id.subdevice) { 1395 snd_timer_user_copy_id(&id, timer); 1396 break; 1397 } 1398 if (timer->tmr_subdevice < id.subdevice) 1399 continue; 1400 snd_timer_user_copy_id(&id, timer); 1401 break; 1402 } 1403 if (p == &snd_timer_list) 1404 snd_timer_user_zero_id(&id); 1405 break; 1406 default: 1407 snd_timer_user_zero_id(&id); 1408 } 1409 } 1410 up(®ister_mutex); 1411 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1412 return -EFAULT; 1413 return 0; 1414 } 1415 1416 static int snd_timer_user_ginfo(struct file *file, 1417 struct snd_timer_ginfo __user *_ginfo) 1418 { 1419 struct snd_timer_ginfo *ginfo; 1420 struct snd_timer_id tid; 1421 struct snd_timer *t; 1422 struct list_head *p; 1423 int err = 0; 1424 1425 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL); 1426 if (! ginfo) 1427 return -ENOMEM; 1428 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) { 1429 kfree(ginfo); 1430 return -EFAULT; 1431 } 1432 tid = ginfo->tid; 1433 memset(ginfo, 0, sizeof(*ginfo)); 1434 ginfo->tid = tid; 1435 down(®ister_mutex); 1436 t = snd_timer_find(&tid); 1437 if (t != NULL) { 1438 ginfo->card = t->card ? t->card->number : -1; 1439 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1440 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1441 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1442 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1443 ginfo->resolution = t->hw.resolution; 1444 if (t->hw.resolution_min > 0) { 1445 ginfo->resolution_min = t->hw.resolution_min; 1446 ginfo->resolution_max = t->hw.resolution_max; 1447 } 1448 list_for_each(p, &t->open_list_head) { 1449 ginfo->clients++; 1450 } 1451 } else { 1452 err = -ENODEV; 1453 } 1454 up(®ister_mutex); 1455 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1456 err = -EFAULT; 1457 kfree(ginfo); 1458 return err; 1459 } 1460 1461 static int snd_timer_user_gparams(struct file *file, 1462 struct snd_timer_gparams __user *_gparams) 1463 { 1464 struct snd_timer_gparams gparams; 1465 struct snd_timer *t; 1466 int err; 1467 1468 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1469 return -EFAULT; 1470 down(®ister_mutex); 1471 t = snd_timer_find(&gparams.tid); 1472 if (!t) { 1473 err = -ENODEV; 1474 goto _error; 1475 } 1476 if (!list_empty(&t->open_list_head)) { 1477 err = -EBUSY; 1478 goto _error; 1479 } 1480 if (!t->hw.set_period) { 1481 err = -ENOSYS; 1482 goto _error; 1483 } 1484 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1485 _error: 1486 up(®ister_mutex); 1487 return err; 1488 } 1489 1490 static int snd_timer_user_gstatus(struct file *file, 1491 struct snd_timer_gstatus __user *_gstatus) 1492 { 1493 struct snd_timer_gstatus gstatus; 1494 struct snd_timer_id tid; 1495 struct snd_timer *t; 1496 int err = 0; 1497 1498 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1499 return -EFAULT; 1500 tid = gstatus.tid; 1501 memset(&gstatus, 0, sizeof(gstatus)); 1502 gstatus.tid = tid; 1503 down(®ister_mutex); 1504 t = snd_timer_find(&tid); 1505 if (t != NULL) { 1506 if (t->hw.c_resolution) 1507 gstatus.resolution = t->hw.c_resolution(t); 1508 else 1509 gstatus.resolution = t->hw.resolution; 1510 if (t->hw.precise_resolution) { 1511 t->hw.precise_resolution(t, &gstatus.resolution_num, 1512 &gstatus.resolution_den); 1513 } else { 1514 gstatus.resolution_num = gstatus.resolution; 1515 gstatus.resolution_den = 1000000000uL; 1516 } 1517 } else { 1518 err = -ENODEV; 1519 } 1520 up(®ister_mutex); 1521 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1522 err = -EFAULT; 1523 return err; 1524 } 1525 1526 static int snd_timer_user_tselect(struct file *file, 1527 struct snd_timer_select __user *_tselect) 1528 { 1529 struct snd_timer_user *tu; 1530 struct snd_timer_select tselect; 1531 char str[32]; 1532 int err = 0; 1533 1534 tu = file->private_data; 1535 down(&tu->tread_sem); 1536 if (tu->timeri) { 1537 snd_timer_close(tu->timeri); 1538 tu->timeri = NULL; 1539 } 1540 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1541 err = -EFAULT; 1542 goto __err; 1543 } 1544 sprintf(str, "application %i", current->pid); 1545 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1546 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1547 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1548 if (err < 0) 1549 goto __err; 1550 1551 kfree(tu->queue); 1552 tu->queue = NULL; 1553 kfree(tu->tqueue); 1554 tu->tqueue = NULL; 1555 if (tu->tread) { 1556 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1557 GFP_KERNEL); 1558 if (tu->tqueue == NULL) 1559 err = -ENOMEM; 1560 } else { 1561 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1562 GFP_KERNEL); 1563 if (tu->queue == NULL) 1564 err = -ENOMEM; 1565 } 1566 1567 if (err < 0) { 1568 snd_timer_close(tu->timeri); 1569 tu->timeri = NULL; 1570 } else { 1571 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1572 tu->timeri->callback = tu->tread 1573 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1574 tu->timeri->ccallback = snd_timer_user_ccallback; 1575 tu->timeri->callback_data = (void *)tu; 1576 } 1577 1578 __err: 1579 up(&tu->tread_sem); 1580 return err; 1581 } 1582 1583 static int snd_timer_user_info(struct file *file, 1584 struct snd_timer_info __user *_info) 1585 { 1586 struct snd_timer_user *tu; 1587 struct snd_timer_info *info; 1588 struct snd_timer *t; 1589 int err = 0; 1590 1591 tu = file->private_data; 1592 snd_assert(tu->timeri != NULL, return -ENXIO); 1593 t = tu->timeri->timer; 1594 snd_assert(t != NULL, return -ENXIO); 1595 1596 info = kzalloc(sizeof(*info), GFP_KERNEL); 1597 if (! info) 1598 return -ENOMEM; 1599 info->card = t->card ? t->card->number : -1; 1600 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1601 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1602 strlcpy(info->id, t->id, sizeof(info->id)); 1603 strlcpy(info->name, t->name, sizeof(info->name)); 1604 info->resolution = t->hw.resolution; 1605 if (copy_to_user(_info, info, sizeof(*_info))) 1606 err = -EFAULT; 1607 kfree(info); 1608 return err; 1609 } 1610 1611 static int snd_timer_user_params(struct file *file, 1612 struct snd_timer_params __user *_params) 1613 { 1614 struct snd_timer_user *tu; 1615 struct snd_timer_params params; 1616 struct snd_timer *t; 1617 struct snd_timer_read *tr; 1618 struct snd_timer_tread *ttr; 1619 int err; 1620 1621 tu = file->private_data; 1622 snd_assert(tu->timeri != NULL, return -ENXIO); 1623 t = tu->timeri->timer; 1624 snd_assert(t != NULL, return -ENXIO); 1625 if (copy_from_user(¶ms, _params, sizeof(params))) 1626 return -EFAULT; 1627 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1628 err = -EINVAL; 1629 goto _end; 1630 } 1631 if (params.queue_size > 0 && 1632 (params.queue_size < 32 || params.queue_size > 1024)) { 1633 err = -EINVAL; 1634 goto _end; 1635 } 1636 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1637 (1<<SNDRV_TIMER_EVENT_TICK)| 1638 (1<<SNDRV_TIMER_EVENT_START)| 1639 (1<<SNDRV_TIMER_EVENT_STOP)| 1640 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1641 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1642 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1643 (1<<SNDRV_TIMER_EVENT_RESUME)| 1644 (1<<SNDRV_TIMER_EVENT_MSTART)| 1645 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1646 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1647 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1648 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1649 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1650 err = -EINVAL; 1651 goto _end; 1652 } 1653 snd_timer_stop(tu->timeri); 1654 spin_lock_irq(&t->lock); 1655 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1656 SNDRV_TIMER_IFLG_EXCLUSIVE| 1657 SNDRV_TIMER_IFLG_EARLY_EVENT); 1658 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1659 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1660 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1661 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1662 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1663 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1664 spin_unlock_irq(&t->lock); 1665 if (params.queue_size > 0 && 1666 (unsigned int)tu->queue_size != params.queue_size) { 1667 if (tu->tread) { 1668 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1669 GFP_KERNEL); 1670 if (ttr) { 1671 kfree(tu->tqueue); 1672 tu->queue_size = params.queue_size; 1673 tu->tqueue = ttr; 1674 } 1675 } else { 1676 tr = kmalloc(params.queue_size * sizeof(*tr), 1677 GFP_KERNEL); 1678 if (tr) { 1679 kfree(tu->queue); 1680 tu->queue_size = params.queue_size; 1681 tu->queue = tr; 1682 } 1683 } 1684 } 1685 tu->qhead = tu->qtail = tu->qused = 0; 1686 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1687 if (tu->tread) { 1688 struct snd_timer_tread tread; 1689 tread.event = SNDRV_TIMER_EVENT_EARLY; 1690 tread.tstamp.tv_sec = 0; 1691 tread.tstamp.tv_nsec = 0; 1692 tread.val = 0; 1693 snd_timer_user_append_to_tqueue(tu, &tread); 1694 } else { 1695 struct snd_timer_read *r = &tu->queue[0]; 1696 r->resolution = 0; 1697 r->ticks = 0; 1698 tu->qused++; 1699 tu->qtail++; 1700 } 1701 } 1702 tu->filter = params.filter; 1703 tu->ticks = params.ticks; 1704 err = 0; 1705 _end: 1706 if (copy_to_user(_params, ¶ms, sizeof(params))) 1707 return -EFAULT; 1708 return err; 1709 } 1710 1711 static int snd_timer_user_status(struct file *file, 1712 struct snd_timer_status __user *_status) 1713 { 1714 struct snd_timer_user *tu; 1715 struct snd_timer_status status; 1716 1717 tu = file->private_data; 1718 snd_assert(tu->timeri != NULL, return -ENXIO); 1719 memset(&status, 0, sizeof(status)); 1720 status.tstamp = tu->tstamp; 1721 status.resolution = snd_timer_resolution(tu->timeri); 1722 status.lost = tu->timeri->lost; 1723 status.overrun = tu->overrun; 1724 spin_lock_irq(&tu->qlock); 1725 status.queue = tu->qused; 1726 spin_unlock_irq(&tu->qlock); 1727 if (copy_to_user(_status, &status, sizeof(status))) 1728 return -EFAULT; 1729 return 0; 1730 } 1731 1732 static int snd_timer_user_start(struct file *file) 1733 { 1734 int err; 1735 struct snd_timer_user *tu; 1736 1737 tu = file->private_data; 1738 snd_assert(tu->timeri != NULL, return -ENXIO); 1739 snd_timer_stop(tu->timeri); 1740 tu->timeri->lost = 0; 1741 tu->last_resolution = 0; 1742 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1743 } 1744 1745 static int snd_timer_user_stop(struct file *file) 1746 { 1747 int err; 1748 struct snd_timer_user *tu; 1749 1750 tu = file->private_data; 1751 snd_assert(tu->timeri != NULL, return -ENXIO); 1752 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1753 } 1754 1755 static int snd_timer_user_continue(struct file *file) 1756 { 1757 int err; 1758 struct snd_timer_user *tu; 1759 1760 tu = file->private_data; 1761 snd_assert(tu->timeri != NULL, return -ENXIO); 1762 tu->timeri->lost = 0; 1763 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1764 } 1765 1766 static int snd_timer_user_pause(struct file *file) 1767 { 1768 int err; 1769 struct snd_timer_user *tu; 1770 1771 tu = file->private_data; 1772 snd_assert(tu->timeri != NULL, return -ENXIO); 1773 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1774 } 1775 1776 enum { 1777 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1778 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1779 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1780 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1781 }; 1782 1783 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1784 unsigned long arg) 1785 { 1786 struct snd_timer_user *tu; 1787 void __user *argp = (void __user *)arg; 1788 int __user *p = argp; 1789 1790 tu = file->private_data; 1791 switch (cmd) { 1792 case SNDRV_TIMER_IOCTL_PVERSION: 1793 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1794 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1795 return snd_timer_user_next_device(argp); 1796 case SNDRV_TIMER_IOCTL_TREAD: 1797 { 1798 int xarg; 1799 1800 down(&tu->tread_sem); 1801 if (tu->timeri) { /* too late */ 1802 up(&tu->tread_sem); 1803 return -EBUSY; 1804 } 1805 if (get_user(xarg, p)) { 1806 up(&tu->tread_sem); 1807 return -EFAULT; 1808 } 1809 tu->tread = xarg ? 1 : 0; 1810 up(&tu->tread_sem); 1811 return 0; 1812 } 1813 case SNDRV_TIMER_IOCTL_GINFO: 1814 return snd_timer_user_ginfo(file, argp); 1815 case SNDRV_TIMER_IOCTL_GPARAMS: 1816 return snd_timer_user_gparams(file, argp); 1817 case SNDRV_TIMER_IOCTL_GSTATUS: 1818 return snd_timer_user_gstatus(file, argp); 1819 case SNDRV_TIMER_IOCTL_SELECT: 1820 return snd_timer_user_tselect(file, argp); 1821 case SNDRV_TIMER_IOCTL_INFO: 1822 return snd_timer_user_info(file, argp); 1823 case SNDRV_TIMER_IOCTL_PARAMS: 1824 return snd_timer_user_params(file, argp); 1825 case SNDRV_TIMER_IOCTL_STATUS: 1826 return snd_timer_user_status(file, argp); 1827 case SNDRV_TIMER_IOCTL_START: 1828 case SNDRV_TIMER_IOCTL_START_OLD: 1829 return snd_timer_user_start(file); 1830 case SNDRV_TIMER_IOCTL_STOP: 1831 case SNDRV_TIMER_IOCTL_STOP_OLD: 1832 return snd_timer_user_stop(file); 1833 case SNDRV_TIMER_IOCTL_CONTINUE: 1834 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1835 return snd_timer_user_continue(file); 1836 case SNDRV_TIMER_IOCTL_PAUSE: 1837 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1838 return snd_timer_user_pause(file); 1839 } 1840 return -ENOTTY; 1841 } 1842 1843 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1844 { 1845 struct snd_timer_user *tu; 1846 int err; 1847 1848 tu = file->private_data; 1849 err = fasync_helper(fd, file, on, &tu->fasync); 1850 if (err < 0) 1851 return err; 1852 return 0; 1853 } 1854 1855 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1856 size_t count, loff_t *offset) 1857 { 1858 struct snd_timer_user *tu; 1859 long result = 0, unit; 1860 int err = 0; 1861 1862 tu = file->private_data; 1863 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1864 spin_lock_irq(&tu->qlock); 1865 while ((long)count - result >= unit) { 1866 while (!tu->qused) { 1867 wait_queue_t wait; 1868 1869 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1870 err = -EAGAIN; 1871 break; 1872 } 1873 1874 set_current_state(TASK_INTERRUPTIBLE); 1875 init_waitqueue_entry(&wait, current); 1876 add_wait_queue(&tu->qchange_sleep, &wait); 1877 1878 spin_unlock_irq(&tu->qlock); 1879 schedule(); 1880 spin_lock_irq(&tu->qlock); 1881 1882 remove_wait_queue(&tu->qchange_sleep, &wait); 1883 1884 if (signal_pending(current)) { 1885 err = -ERESTARTSYS; 1886 break; 1887 } 1888 } 1889 1890 spin_unlock_irq(&tu->qlock); 1891 if (err < 0) 1892 goto _error; 1893 1894 if (tu->tread) { 1895 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1896 sizeof(struct snd_timer_tread))) { 1897 err = -EFAULT; 1898 goto _error; 1899 } 1900 } else { 1901 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1902 sizeof(struct snd_timer_read))) { 1903 err = -EFAULT; 1904 goto _error; 1905 } 1906 } 1907 1908 tu->qhead %= tu->queue_size; 1909 1910 result += unit; 1911 buffer += unit; 1912 1913 spin_lock_irq(&tu->qlock); 1914 tu->qused--; 1915 } 1916 spin_unlock_irq(&tu->qlock); 1917 _error: 1918 return result > 0 ? result : err; 1919 } 1920 1921 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1922 { 1923 unsigned int mask; 1924 struct snd_timer_user *tu; 1925 1926 tu = file->private_data; 1927 1928 poll_wait(file, &tu->qchange_sleep, wait); 1929 1930 mask = 0; 1931 if (tu->qused) 1932 mask |= POLLIN | POLLRDNORM; 1933 1934 return mask; 1935 } 1936 1937 #ifdef CONFIG_COMPAT 1938 #include "timer_compat.c" 1939 #else 1940 #define snd_timer_user_ioctl_compat NULL 1941 #endif 1942 1943 static struct file_operations snd_timer_f_ops = 1944 { 1945 .owner = THIS_MODULE, 1946 .read = snd_timer_user_read, 1947 .open = snd_timer_user_open, 1948 .release = snd_timer_user_release, 1949 .poll = snd_timer_user_poll, 1950 .unlocked_ioctl = snd_timer_user_ioctl, 1951 .compat_ioctl = snd_timer_user_ioctl_compat, 1952 .fasync = snd_timer_user_fasync, 1953 }; 1954 1955 /* 1956 * ENTRY functions 1957 */ 1958 1959 static int __init alsa_timer_init(void) 1960 { 1961 int err; 1962 1963 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1964 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 1965 "system timer"); 1966 #endif 1967 1968 if ((err = snd_timer_register_system()) < 0) 1969 snd_printk(KERN_ERR "unable to register system timer (%i)\n", 1970 err); 1971 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 1972 &snd_timer_f_ops, NULL, "timer")) < 0) 1973 snd_printk(KERN_ERR "unable to register timer device (%i)\n", 1974 err); 1975 snd_timer_proc_init(); 1976 return 0; 1977 } 1978 1979 static void __exit alsa_timer_exit(void) 1980 { 1981 struct list_head *p, *n; 1982 1983 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 1984 /* unregister the system timer */ 1985 list_for_each_safe(p, n, &snd_timer_list) { 1986 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list); 1987 snd_timer_unregister(timer); 1988 } 1989 snd_timer_proc_done(); 1990 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1991 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1992 #endif 1993 } 1994 1995 module_init(alsa_timer_init) 1996 module_exit(alsa_timer_exit) 1997 1998 EXPORT_SYMBOL(snd_timer_open); 1999 EXPORT_SYMBOL(snd_timer_close); 2000 EXPORT_SYMBOL(snd_timer_resolution); 2001 EXPORT_SYMBOL(snd_timer_start); 2002 EXPORT_SYMBOL(snd_timer_stop); 2003 EXPORT_SYMBOL(snd_timer_continue); 2004 EXPORT_SYMBOL(snd_timer_pause); 2005 EXPORT_SYMBOL(snd_timer_new); 2006 EXPORT_SYMBOL(snd_timer_notify); 2007 EXPORT_SYMBOL(snd_timer_global_new); 2008 EXPORT_SYMBOL(snd_timer_global_free); 2009 EXPORT_SYMBOL(snd_timer_global_register); 2010 EXPORT_SYMBOL(snd_timer_global_unregister); 2011 EXPORT_SYMBOL(snd_timer_interrupt); 2012