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_unregister(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, ticks_left); 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_unregister = snd_timer_dev_unregister 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 if (timer->private_free) 817 timer->private_free(timer); 818 kfree(timer); 819 return 0; 820 } 821 822 static int snd_timer_dev_free(struct snd_device *device) 823 { 824 struct snd_timer *timer = device->device_data; 825 return snd_timer_free(timer); 826 } 827 828 static int snd_timer_dev_register(struct snd_device *dev) 829 { 830 struct snd_timer *timer = dev->device_data; 831 struct snd_timer *timer1; 832 struct list_head *p; 833 834 snd_assert(timer != NULL && timer->hw.start != NULL && 835 timer->hw.stop != NULL, return -ENXIO); 836 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 837 !timer->hw.resolution && timer->hw.c_resolution == NULL) 838 return -EINVAL; 839 840 mutex_lock(®ister_mutex); 841 list_for_each(p, &snd_timer_list) { 842 timer1 = list_entry(p, struct snd_timer, device_list); 843 if (timer1->tmr_class > timer->tmr_class) 844 break; 845 if (timer1->tmr_class < timer->tmr_class) 846 continue; 847 if (timer1->card && timer->card) { 848 if (timer1->card->number > timer->card->number) 849 break; 850 if (timer1->card->number < timer->card->number) 851 continue; 852 } 853 if (timer1->tmr_device > timer->tmr_device) 854 break; 855 if (timer1->tmr_device < timer->tmr_device) 856 continue; 857 if (timer1->tmr_subdevice > timer->tmr_subdevice) 858 break; 859 if (timer1->tmr_subdevice < timer->tmr_subdevice) 860 continue; 861 /* conflicts.. */ 862 mutex_unlock(®ister_mutex); 863 return -EBUSY; 864 } 865 list_add_tail(&timer->device_list, p); 866 mutex_unlock(®ister_mutex); 867 return 0; 868 } 869 870 static int snd_timer_unregister(struct snd_timer *timer) 871 { 872 struct list_head *p, *n; 873 struct snd_timer_instance *ti; 874 875 snd_assert(timer != NULL, return -ENXIO); 876 mutex_lock(®ister_mutex); 877 if (! list_empty(&timer->open_list_head)) { 878 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer); 879 list_for_each_safe(p, n, &timer->open_list_head) { 880 list_del_init(p); 881 ti = list_entry(p, struct snd_timer_instance, open_list); 882 ti->timer = NULL; 883 } 884 } 885 list_del(&timer->device_list); 886 mutex_unlock(®ister_mutex); 887 return snd_timer_free(timer); 888 } 889 890 static int snd_timer_dev_unregister(struct snd_device *device) 891 { 892 struct snd_timer *timer = device->device_data; 893 return snd_timer_unregister(timer); 894 } 895 896 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 897 { 898 unsigned long flags; 899 unsigned long resolution = 0; 900 struct snd_timer_instance *ti, *ts; 901 struct list_head *p, *n; 902 903 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 904 return; 905 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && 906 event <= SNDRV_TIMER_EVENT_MRESUME, return); 907 spin_lock_irqsave(&timer->lock, flags); 908 if (event == SNDRV_TIMER_EVENT_MSTART || 909 event == SNDRV_TIMER_EVENT_MCONTINUE || 910 event == SNDRV_TIMER_EVENT_MRESUME) { 911 if (timer->hw.c_resolution) 912 resolution = timer->hw.c_resolution(timer); 913 else 914 resolution = timer->hw.resolution; 915 } 916 list_for_each(p, &timer->active_list_head) { 917 ti = list_entry(p, struct snd_timer_instance, active_list); 918 if (ti->ccallback) 919 ti->ccallback(ti, event, tstamp, resolution); 920 list_for_each(n, &ti->slave_active_head) { 921 ts = list_entry(n, struct snd_timer_instance, active_list); 922 if (ts->ccallback) 923 ts->ccallback(ts, event, tstamp, resolution); 924 } 925 } 926 spin_unlock_irqrestore(&timer->lock, flags); 927 } 928 929 /* 930 * exported functions for global timers 931 */ 932 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 933 { 934 struct snd_timer_id tid; 935 936 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 937 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 938 tid.card = -1; 939 tid.device = device; 940 tid.subdevice = 0; 941 return snd_timer_new(NULL, id, &tid, rtimer); 942 } 943 944 int snd_timer_global_free(struct snd_timer *timer) 945 { 946 return snd_timer_free(timer); 947 } 948 949 int snd_timer_global_register(struct snd_timer *timer) 950 { 951 struct snd_device dev; 952 953 memset(&dev, 0, sizeof(dev)); 954 dev.device_data = timer; 955 return snd_timer_dev_register(&dev); 956 } 957 958 int snd_timer_global_unregister(struct snd_timer *timer) 959 { 960 return snd_timer_unregister(timer); 961 } 962 963 /* 964 * System timer 965 */ 966 967 struct snd_timer_system_private { 968 struct timer_list tlist; 969 struct timer * timer; 970 unsigned long last_expires; 971 unsigned long last_jiffies; 972 unsigned long correction; 973 }; 974 975 static void snd_timer_s_function(unsigned long data) 976 { 977 struct snd_timer *timer = (struct snd_timer *)data; 978 struct snd_timer_system_private *priv = timer->private_data; 979 unsigned long jiff = jiffies; 980 if (time_after(jiff, priv->last_expires)) 981 priv->correction = (long)jiff - (long)priv->last_expires; 982 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 983 } 984 985 static int snd_timer_s_start(struct snd_timer * timer) 986 { 987 struct snd_timer_system_private *priv; 988 unsigned long njiff; 989 990 priv = (struct snd_timer_system_private *) timer->private_data; 991 njiff = (priv->last_jiffies = jiffies); 992 if (priv->correction > timer->sticks - 1) { 993 priv->correction -= timer->sticks - 1; 994 njiff++; 995 } else { 996 njiff += timer->sticks - priv->correction; 997 priv->correction -= timer->sticks; 998 } 999 priv->last_expires = priv->tlist.expires = njiff; 1000 add_timer(&priv->tlist); 1001 return 0; 1002 } 1003 1004 static int snd_timer_s_stop(struct snd_timer * timer) 1005 { 1006 struct snd_timer_system_private *priv; 1007 unsigned long jiff; 1008 1009 priv = (struct snd_timer_system_private *) timer->private_data; 1010 del_timer(&priv->tlist); 1011 jiff = jiffies; 1012 if (time_before(jiff, priv->last_expires)) 1013 timer->sticks = priv->last_expires - jiff; 1014 else 1015 timer->sticks = 1; 1016 return 0; 1017 } 1018 1019 static struct snd_timer_hardware snd_timer_system = 1020 { 1021 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1022 .resolution = 1000000000L / HZ, 1023 .ticks = 10000000L, 1024 .start = snd_timer_s_start, 1025 .stop = snd_timer_s_stop 1026 }; 1027 1028 static void snd_timer_free_system(struct snd_timer *timer) 1029 { 1030 kfree(timer->private_data); 1031 } 1032 1033 static int snd_timer_register_system(void) 1034 { 1035 struct snd_timer *timer; 1036 struct snd_timer_system_private *priv; 1037 int err; 1038 1039 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1040 if (err < 0) 1041 return err; 1042 strcpy(timer->name, "system timer"); 1043 timer->hw = snd_timer_system; 1044 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1045 if (priv == NULL) { 1046 snd_timer_free(timer); 1047 return -ENOMEM; 1048 } 1049 init_timer(&priv->tlist); 1050 priv->tlist.function = snd_timer_s_function; 1051 priv->tlist.data = (unsigned long) timer; 1052 timer->private_data = priv; 1053 timer->private_free = snd_timer_free_system; 1054 return snd_timer_global_register(timer); 1055 } 1056 1057 #ifdef CONFIG_PROC_FS 1058 /* 1059 * Info interface 1060 */ 1061 1062 static void snd_timer_proc_read(struct snd_info_entry *entry, 1063 struct snd_info_buffer *buffer) 1064 { 1065 struct snd_timer *timer; 1066 struct snd_timer_instance *ti; 1067 struct list_head *p, *q; 1068 1069 mutex_lock(®ister_mutex); 1070 list_for_each(p, &snd_timer_list) { 1071 timer = list_entry(p, struct snd_timer, device_list); 1072 switch (timer->tmr_class) { 1073 case SNDRV_TIMER_CLASS_GLOBAL: 1074 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1075 break; 1076 case SNDRV_TIMER_CLASS_CARD: 1077 snd_iprintf(buffer, "C%i-%i: ", 1078 timer->card->number, timer->tmr_device); 1079 break; 1080 case SNDRV_TIMER_CLASS_PCM: 1081 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1082 timer->tmr_device, timer->tmr_subdevice); 1083 break; 1084 default: 1085 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1086 timer->card ? timer->card->number : -1, 1087 timer->tmr_device, timer->tmr_subdevice); 1088 } 1089 snd_iprintf(buffer, "%s :", timer->name); 1090 if (timer->hw.resolution) 1091 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1092 timer->hw.resolution / 1000, 1093 timer->hw.resolution % 1000, 1094 timer->hw.ticks); 1095 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1096 snd_iprintf(buffer, " SLAVE"); 1097 snd_iprintf(buffer, "\n"); 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 } 1107 mutex_unlock(®ister_mutex); 1108 } 1109 1110 static struct snd_info_entry *snd_timer_proc_entry; 1111 1112 static void __init snd_timer_proc_init(void) 1113 { 1114 struct snd_info_entry *entry; 1115 1116 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1117 if (entry != NULL) { 1118 entry->c.text.read = snd_timer_proc_read; 1119 if (snd_info_register(entry) < 0) { 1120 snd_info_free_entry(entry); 1121 entry = NULL; 1122 } 1123 } 1124 snd_timer_proc_entry = entry; 1125 } 1126 1127 static void __exit snd_timer_proc_done(void) 1128 { 1129 snd_info_unregister(snd_timer_proc_entry); 1130 } 1131 #else /* !CONFIG_PROC_FS */ 1132 #define snd_timer_proc_init() 1133 #define snd_timer_proc_done() 1134 #endif 1135 1136 /* 1137 * USER SPACE interface 1138 */ 1139 1140 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1141 unsigned long resolution, 1142 unsigned long ticks) 1143 { 1144 struct snd_timer_user *tu = timeri->callback_data; 1145 struct snd_timer_read *r; 1146 int prev; 1147 1148 spin_lock(&tu->qlock); 1149 if (tu->qused > 0) { 1150 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1151 r = &tu->queue[prev]; 1152 if (r->resolution == resolution) { 1153 r->ticks += ticks; 1154 goto __wake; 1155 } 1156 } 1157 if (tu->qused >= tu->queue_size) { 1158 tu->overrun++; 1159 } else { 1160 r = &tu->queue[tu->qtail++]; 1161 tu->qtail %= tu->queue_size; 1162 r->resolution = resolution; 1163 r->ticks = ticks; 1164 tu->qused++; 1165 } 1166 __wake: 1167 spin_unlock(&tu->qlock); 1168 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1169 wake_up(&tu->qchange_sleep); 1170 } 1171 1172 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1173 struct snd_timer_tread *tread) 1174 { 1175 if (tu->qused >= tu->queue_size) { 1176 tu->overrun++; 1177 } else { 1178 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1179 tu->qtail %= tu->queue_size; 1180 tu->qused++; 1181 } 1182 } 1183 1184 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1185 int event, 1186 struct timespec *tstamp, 1187 unsigned long resolution) 1188 { 1189 struct snd_timer_user *tu = timeri->callback_data; 1190 struct snd_timer_tread r1; 1191 1192 if (event >= SNDRV_TIMER_EVENT_START && 1193 event <= SNDRV_TIMER_EVENT_PAUSE) 1194 tu->tstamp = *tstamp; 1195 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1196 return; 1197 r1.event = event; 1198 r1.tstamp = *tstamp; 1199 r1.val = resolution; 1200 spin_lock(&tu->qlock); 1201 snd_timer_user_append_to_tqueue(tu, &r1); 1202 spin_unlock(&tu->qlock); 1203 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1204 wake_up(&tu->qchange_sleep); 1205 } 1206 1207 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1208 unsigned long resolution, 1209 unsigned long ticks) 1210 { 1211 struct snd_timer_user *tu = timeri->callback_data; 1212 struct snd_timer_tread *r, r1; 1213 struct timespec tstamp; 1214 int prev, append = 0; 1215 1216 memset(&tstamp, 0, sizeof(tstamp)); 1217 spin_lock(&tu->qlock); 1218 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1219 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1220 spin_unlock(&tu->qlock); 1221 return; 1222 } 1223 if (tu->last_resolution != resolution || ticks > 0) 1224 getnstimeofday(&tstamp); 1225 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1226 tu->last_resolution != resolution) { 1227 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1228 r1.tstamp = tstamp; 1229 r1.val = resolution; 1230 snd_timer_user_append_to_tqueue(tu, &r1); 1231 tu->last_resolution = resolution; 1232 append++; 1233 } 1234 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1235 goto __wake; 1236 if (ticks == 0) 1237 goto __wake; 1238 if (tu->qused > 0) { 1239 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1240 r = &tu->tqueue[prev]; 1241 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1242 r->tstamp = tstamp; 1243 r->val += ticks; 1244 append++; 1245 goto __wake; 1246 } 1247 } 1248 r1.event = SNDRV_TIMER_EVENT_TICK; 1249 r1.tstamp = tstamp; 1250 r1.val = ticks; 1251 snd_timer_user_append_to_tqueue(tu, &r1); 1252 append++; 1253 __wake: 1254 spin_unlock(&tu->qlock); 1255 if (append == 0) 1256 return; 1257 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1258 wake_up(&tu->qchange_sleep); 1259 } 1260 1261 static int snd_timer_user_open(struct inode *inode, struct file *file) 1262 { 1263 struct snd_timer_user *tu; 1264 1265 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1266 if (tu == NULL) 1267 return -ENOMEM; 1268 spin_lock_init(&tu->qlock); 1269 init_waitqueue_head(&tu->qchange_sleep); 1270 mutex_init(&tu->tread_sem); 1271 tu->ticks = 1; 1272 tu->queue_size = 128; 1273 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1274 GFP_KERNEL); 1275 if (tu->queue == NULL) { 1276 kfree(tu); 1277 return -ENOMEM; 1278 } 1279 file->private_data = tu; 1280 return 0; 1281 } 1282 1283 static int snd_timer_user_release(struct inode *inode, struct file *file) 1284 { 1285 struct snd_timer_user *tu; 1286 1287 if (file->private_data) { 1288 tu = file->private_data; 1289 file->private_data = NULL; 1290 fasync_helper(-1, file, 0, &tu->fasync); 1291 if (tu->timeri) 1292 snd_timer_close(tu->timeri); 1293 kfree(tu->queue); 1294 kfree(tu->tqueue); 1295 kfree(tu); 1296 } 1297 return 0; 1298 } 1299 1300 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1301 { 1302 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1303 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1304 id->card = -1; 1305 id->device = -1; 1306 id->subdevice = -1; 1307 } 1308 1309 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1310 { 1311 id->dev_class = timer->tmr_class; 1312 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1313 id->card = timer->card ? timer->card->number : -1; 1314 id->device = timer->tmr_device; 1315 id->subdevice = timer->tmr_subdevice; 1316 } 1317 1318 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1319 { 1320 struct snd_timer_id id; 1321 struct snd_timer *timer; 1322 struct list_head *p; 1323 1324 if (copy_from_user(&id, _tid, sizeof(id))) 1325 return -EFAULT; 1326 mutex_lock(®ister_mutex); 1327 if (id.dev_class < 0) { /* first item */ 1328 if (list_empty(&snd_timer_list)) 1329 snd_timer_user_zero_id(&id); 1330 else { 1331 timer = list_entry(snd_timer_list.next, 1332 struct snd_timer, device_list); 1333 snd_timer_user_copy_id(&id, timer); 1334 } 1335 } else { 1336 switch (id.dev_class) { 1337 case SNDRV_TIMER_CLASS_GLOBAL: 1338 id.device = id.device < 0 ? 0 : id.device + 1; 1339 list_for_each(p, &snd_timer_list) { 1340 timer = list_entry(p, struct snd_timer, device_list); 1341 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1342 snd_timer_user_copy_id(&id, timer); 1343 break; 1344 } 1345 if (timer->tmr_device >= id.device) { 1346 snd_timer_user_copy_id(&id, timer); 1347 break; 1348 } 1349 } 1350 if (p == &snd_timer_list) 1351 snd_timer_user_zero_id(&id); 1352 break; 1353 case SNDRV_TIMER_CLASS_CARD: 1354 case SNDRV_TIMER_CLASS_PCM: 1355 if (id.card < 0) { 1356 id.card = 0; 1357 } else { 1358 if (id.card < 0) { 1359 id.card = 0; 1360 } else { 1361 if (id.device < 0) { 1362 id.device = 0; 1363 } else { 1364 if (id.subdevice < 0) { 1365 id.subdevice = 0; 1366 } else { 1367 id.subdevice++; 1368 } 1369 } 1370 } 1371 } 1372 list_for_each(p, &snd_timer_list) { 1373 timer = list_entry(p, struct snd_timer, device_list); 1374 if (timer->tmr_class > id.dev_class) { 1375 snd_timer_user_copy_id(&id, timer); 1376 break; 1377 } 1378 if (timer->tmr_class < id.dev_class) 1379 continue; 1380 if (timer->card->number > id.card) { 1381 snd_timer_user_copy_id(&id, timer); 1382 break; 1383 } 1384 if (timer->card->number < id.card) 1385 continue; 1386 if (timer->tmr_device > id.device) { 1387 snd_timer_user_copy_id(&id, timer); 1388 break; 1389 } 1390 if (timer->tmr_device < id.device) 1391 continue; 1392 if (timer->tmr_subdevice > id.subdevice) { 1393 snd_timer_user_copy_id(&id, timer); 1394 break; 1395 } 1396 if (timer->tmr_subdevice < id.subdevice) 1397 continue; 1398 snd_timer_user_copy_id(&id, timer); 1399 break; 1400 } 1401 if (p == &snd_timer_list) 1402 snd_timer_user_zero_id(&id); 1403 break; 1404 default: 1405 snd_timer_user_zero_id(&id); 1406 } 1407 } 1408 mutex_unlock(®ister_mutex); 1409 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1410 return -EFAULT; 1411 return 0; 1412 } 1413 1414 static int snd_timer_user_ginfo(struct file *file, 1415 struct snd_timer_ginfo __user *_ginfo) 1416 { 1417 struct snd_timer_ginfo *ginfo; 1418 struct snd_timer_id tid; 1419 struct snd_timer *t; 1420 struct list_head *p; 1421 int err = 0; 1422 1423 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL); 1424 if (! ginfo) 1425 return -ENOMEM; 1426 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) { 1427 kfree(ginfo); 1428 return -EFAULT; 1429 } 1430 tid = ginfo->tid; 1431 memset(ginfo, 0, sizeof(*ginfo)); 1432 ginfo->tid = tid; 1433 mutex_lock(®ister_mutex); 1434 t = snd_timer_find(&tid); 1435 if (t != NULL) { 1436 ginfo->card = t->card ? t->card->number : -1; 1437 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1438 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1439 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1440 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1441 ginfo->resolution = t->hw.resolution; 1442 if (t->hw.resolution_min > 0) { 1443 ginfo->resolution_min = t->hw.resolution_min; 1444 ginfo->resolution_max = t->hw.resolution_max; 1445 } 1446 list_for_each(p, &t->open_list_head) { 1447 ginfo->clients++; 1448 } 1449 } else { 1450 err = -ENODEV; 1451 } 1452 mutex_unlock(®ister_mutex); 1453 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1454 err = -EFAULT; 1455 kfree(ginfo); 1456 return err; 1457 } 1458 1459 static int snd_timer_user_gparams(struct file *file, 1460 struct snd_timer_gparams __user *_gparams) 1461 { 1462 struct snd_timer_gparams gparams; 1463 struct snd_timer *t; 1464 int err; 1465 1466 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1467 return -EFAULT; 1468 mutex_lock(®ister_mutex); 1469 t = snd_timer_find(&gparams.tid); 1470 if (!t) { 1471 err = -ENODEV; 1472 goto _error; 1473 } 1474 if (!list_empty(&t->open_list_head)) { 1475 err = -EBUSY; 1476 goto _error; 1477 } 1478 if (!t->hw.set_period) { 1479 err = -ENOSYS; 1480 goto _error; 1481 } 1482 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1483 _error: 1484 mutex_unlock(®ister_mutex); 1485 return err; 1486 } 1487 1488 static int snd_timer_user_gstatus(struct file *file, 1489 struct snd_timer_gstatus __user *_gstatus) 1490 { 1491 struct snd_timer_gstatus gstatus; 1492 struct snd_timer_id tid; 1493 struct snd_timer *t; 1494 int err = 0; 1495 1496 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1497 return -EFAULT; 1498 tid = gstatus.tid; 1499 memset(&gstatus, 0, sizeof(gstatus)); 1500 gstatus.tid = tid; 1501 mutex_lock(®ister_mutex); 1502 t = snd_timer_find(&tid); 1503 if (t != NULL) { 1504 if (t->hw.c_resolution) 1505 gstatus.resolution = t->hw.c_resolution(t); 1506 else 1507 gstatus.resolution = t->hw.resolution; 1508 if (t->hw.precise_resolution) { 1509 t->hw.precise_resolution(t, &gstatus.resolution_num, 1510 &gstatus.resolution_den); 1511 } else { 1512 gstatus.resolution_num = gstatus.resolution; 1513 gstatus.resolution_den = 1000000000uL; 1514 } 1515 } else { 1516 err = -ENODEV; 1517 } 1518 mutex_unlock(®ister_mutex); 1519 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1520 err = -EFAULT; 1521 return err; 1522 } 1523 1524 static int snd_timer_user_tselect(struct file *file, 1525 struct snd_timer_select __user *_tselect) 1526 { 1527 struct snd_timer_user *tu; 1528 struct snd_timer_select tselect; 1529 char str[32]; 1530 int err = 0; 1531 1532 tu = file->private_data; 1533 mutex_lock(&tu->tread_sem); 1534 if (tu->timeri) { 1535 snd_timer_close(tu->timeri); 1536 tu->timeri = NULL; 1537 } 1538 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1539 err = -EFAULT; 1540 goto __err; 1541 } 1542 sprintf(str, "application %i", current->pid); 1543 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1544 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1545 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1546 if (err < 0) 1547 goto __err; 1548 1549 kfree(tu->queue); 1550 tu->queue = NULL; 1551 kfree(tu->tqueue); 1552 tu->tqueue = NULL; 1553 if (tu->tread) { 1554 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1555 GFP_KERNEL); 1556 if (tu->tqueue == NULL) 1557 err = -ENOMEM; 1558 } else { 1559 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1560 GFP_KERNEL); 1561 if (tu->queue == NULL) 1562 err = -ENOMEM; 1563 } 1564 1565 if (err < 0) { 1566 snd_timer_close(tu->timeri); 1567 tu->timeri = NULL; 1568 } else { 1569 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1570 tu->timeri->callback = tu->tread 1571 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1572 tu->timeri->ccallback = snd_timer_user_ccallback; 1573 tu->timeri->callback_data = (void *)tu; 1574 } 1575 1576 __err: 1577 mutex_unlock(&tu->tread_sem); 1578 return err; 1579 } 1580 1581 static int snd_timer_user_info(struct file *file, 1582 struct snd_timer_info __user *_info) 1583 { 1584 struct snd_timer_user *tu; 1585 struct snd_timer_info *info; 1586 struct snd_timer *t; 1587 int err = 0; 1588 1589 tu = file->private_data; 1590 snd_assert(tu->timeri != NULL, return -ENXIO); 1591 t = tu->timeri->timer; 1592 snd_assert(t != NULL, return -ENXIO); 1593 1594 info = kzalloc(sizeof(*info), GFP_KERNEL); 1595 if (! info) 1596 return -ENOMEM; 1597 info->card = t->card ? t->card->number : -1; 1598 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1599 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1600 strlcpy(info->id, t->id, sizeof(info->id)); 1601 strlcpy(info->name, t->name, sizeof(info->name)); 1602 info->resolution = t->hw.resolution; 1603 if (copy_to_user(_info, info, sizeof(*_info))) 1604 err = -EFAULT; 1605 kfree(info); 1606 return err; 1607 } 1608 1609 static int snd_timer_user_params(struct file *file, 1610 struct snd_timer_params __user *_params) 1611 { 1612 struct snd_timer_user *tu; 1613 struct snd_timer_params params; 1614 struct snd_timer *t; 1615 struct snd_timer_read *tr; 1616 struct snd_timer_tread *ttr; 1617 int err; 1618 1619 tu = file->private_data; 1620 snd_assert(tu->timeri != NULL, return -ENXIO); 1621 t = tu->timeri->timer; 1622 snd_assert(t != NULL, return -ENXIO); 1623 if (copy_from_user(¶ms, _params, sizeof(params))) 1624 return -EFAULT; 1625 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1626 err = -EINVAL; 1627 goto _end; 1628 } 1629 if (params.queue_size > 0 && 1630 (params.queue_size < 32 || params.queue_size > 1024)) { 1631 err = -EINVAL; 1632 goto _end; 1633 } 1634 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1635 (1<<SNDRV_TIMER_EVENT_TICK)| 1636 (1<<SNDRV_TIMER_EVENT_START)| 1637 (1<<SNDRV_TIMER_EVENT_STOP)| 1638 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1639 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1640 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1641 (1<<SNDRV_TIMER_EVENT_RESUME)| 1642 (1<<SNDRV_TIMER_EVENT_MSTART)| 1643 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1644 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1645 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1646 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1647 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1648 err = -EINVAL; 1649 goto _end; 1650 } 1651 snd_timer_stop(tu->timeri); 1652 spin_lock_irq(&t->lock); 1653 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1654 SNDRV_TIMER_IFLG_EXCLUSIVE| 1655 SNDRV_TIMER_IFLG_EARLY_EVENT); 1656 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1657 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1658 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1659 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1660 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1661 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1662 spin_unlock_irq(&t->lock); 1663 if (params.queue_size > 0 && 1664 (unsigned int)tu->queue_size != params.queue_size) { 1665 if (tu->tread) { 1666 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1667 GFP_KERNEL); 1668 if (ttr) { 1669 kfree(tu->tqueue); 1670 tu->queue_size = params.queue_size; 1671 tu->tqueue = ttr; 1672 } 1673 } else { 1674 tr = kmalloc(params.queue_size * sizeof(*tr), 1675 GFP_KERNEL); 1676 if (tr) { 1677 kfree(tu->queue); 1678 tu->queue_size = params.queue_size; 1679 tu->queue = tr; 1680 } 1681 } 1682 } 1683 tu->qhead = tu->qtail = tu->qused = 0; 1684 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1685 if (tu->tread) { 1686 struct snd_timer_tread tread; 1687 tread.event = SNDRV_TIMER_EVENT_EARLY; 1688 tread.tstamp.tv_sec = 0; 1689 tread.tstamp.tv_nsec = 0; 1690 tread.val = 0; 1691 snd_timer_user_append_to_tqueue(tu, &tread); 1692 } else { 1693 struct snd_timer_read *r = &tu->queue[0]; 1694 r->resolution = 0; 1695 r->ticks = 0; 1696 tu->qused++; 1697 tu->qtail++; 1698 } 1699 } 1700 tu->filter = params.filter; 1701 tu->ticks = params.ticks; 1702 err = 0; 1703 _end: 1704 if (copy_to_user(_params, ¶ms, sizeof(params))) 1705 return -EFAULT; 1706 return err; 1707 } 1708 1709 static int snd_timer_user_status(struct file *file, 1710 struct snd_timer_status __user *_status) 1711 { 1712 struct snd_timer_user *tu; 1713 struct snd_timer_status status; 1714 1715 tu = file->private_data; 1716 snd_assert(tu->timeri != NULL, return -ENXIO); 1717 memset(&status, 0, sizeof(status)); 1718 status.tstamp = tu->tstamp; 1719 status.resolution = snd_timer_resolution(tu->timeri); 1720 status.lost = tu->timeri->lost; 1721 status.overrun = tu->overrun; 1722 spin_lock_irq(&tu->qlock); 1723 status.queue = tu->qused; 1724 spin_unlock_irq(&tu->qlock); 1725 if (copy_to_user(_status, &status, sizeof(status))) 1726 return -EFAULT; 1727 return 0; 1728 } 1729 1730 static int snd_timer_user_start(struct file *file) 1731 { 1732 int err; 1733 struct snd_timer_user *tu; 1734 1735 tu = file->private_data; 1736 snd_assert(tu->timeri != NULL, return -ENXIO); 1737 snd_timer_stop(tu->timeri); 1738 tu->timeri->lost = 0; 1739 tu->last_resolution = 0; 1740 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1741 } 1742 1743 static int snd_timer_user_stop(struct file *file) 1744 { 1745 int err; 1746 struct snd_timer_user *tu; 1747 1748 tu = file->private_data; 1749 snd_assert(tu->timeri != NULL, return -ENXIO); 1750 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1751 } 1752 1753 static int snd_timer_user_continue(struct file *file) 1754 { 1755 int err; 1756 struct snd_timer_user *tu; 1757 1758 tu = file->private_data; 1759 snd_assert(tu->timeri != NULL, return -ENXIO); 1760 tu->timeri->lost = 0; 1761 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1762 } 1763 1764 static int snd_timer_user_pause(struct file *file) 1765 { 1766 int err; 1767 struct snd_timer_user *tu; 1768 1769 tu = file->private_data; 1770 snd_assert(tu->timeri != NULL, return -ENXIO); 1771 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1772 } 1773 1774 enum { 1775 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1776 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1777 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1778 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1779 }; 1780 1781 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1782 unsigned long arg) 1783 { 1784 struct snd_timer_user *tu; 1785 void __user *argp = (void __user *)arg; 1786 int __user *p = argp; 1787 1788 tu = file->private_data; 1789 switch (cmd) { 1790 case SNDRV_TIMER_IOCTL_PVERSION: 1791 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1792 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1793 return snd_timer_user_next_device(argp); 1794 case SNDRV_TIMER_IOCTL_TREAD: 1795 { 1796 int xarg; 1797 1798 mutex_lock(&tu->tread_sem); 1799 if (tu->timeri) { /* too late */ 1800 mutex_unlock(&tu->tread_sem); 1801 return -EBUSY; 1802 } 1803 if (get_user(xarg, p)) { 1804 mutex_unlock(&tu->tread_sem); 1805 return -EFAULT; 1806 } 1807 tu->tread = xarg ? 1 : 0; 1808 mutex_unlock(&tu->tread_sem); 1809 return 0; 1810 } 1811 case SNDRV_TIMER_IOCTL_GINFO: 1812 return snd_timer_user_ginfo(file, argp); 1813 case SNDRV_TIMER_IOCTL_GPARAMS: 1814 return snd_timer_user_gparams(file, argp); 1815 case SNDRV_TIMER_IOCTL_GSTATUS: 1816 return snd_timer_user_gstatus(file, argp); 1817 case SNDRV_TIMER_IOCTL_SELECT: 1818 return snd_timer_user_tselect(file, argp); 1819 case SNDRV_TIMER_IOCTL_INFO: 1820 return snd_timer_user_info(file, argp); 1821 case SNDRV_TIMER_IOCTL_PARAMS: 1822 return snd_timer_user_params(file, argp); 1823 case SNDRV_TIMER_IOCTL_STATUS: 1824 return snd_timer_user_status(file, argp); 1825 case SNDRV_TIMER_IOCTL_START: 1826 case SNDRV_TIMER_IOCTL_START_OLD: 1827 return snd_timer_user_start(file); 1828 case SNDRV_TIMER_IOCTL_STOP: 1829 case SNDRV_TIMER_IOCTL_STOP_OLD: 1830 return snd_timer_user_stop(file); 1831 case SNDRV_TIMER_IOCTL_CONTINUE: 1832 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1833 return snd_timer_user_continue(file); 1834 case SNDRV_TIMER_IOCTL_PAUSE: 1835 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1836 return snd_timer_user_pause(file); 1837 } 1838 return -ENOTTY; 1839 } 1840 1841 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1842 { 1843 struct snd_timer_user *tu; 1844 int err; 1845 1846 tu = file->private_data; 1847 err = fasync_helper(fd, file, on, &tu->fasync); 1848 if (err < 0) 1849 return err; 1850 return 0; 1851 } 1852 1853 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1854 size_t count, loff_t *offset) 1855 { 1856 struct snd_timer_user *tu; 1857 long result = 0, unit; 1858 int err = 0; 1859 1860 tu = file->private_data; 1861 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1862 spin_lock_irq(&tu->qlock); 1863 while ((long)count - result >= unit) { 1864 while (!tu->qused) { 1865 wait_queue_t wait; 1866 1867 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1868 err = -EAGAIN; 1869 break; 1870 } 1871 1872 set_current_state(TASK_INTERRUPTIBLE); 1873 init_waitqueue_entry(&wait, current); 1874 add_wait_queue(&tu->qchange_sleep, &wait); 1875 1876 spin_unlock_irq(&tu->qlock); 1877 schedule(); 1878 spin_lock_irq(&tu->qlock); 1879 1880 remove_wait_queue(&tu->qchange_sleep, &wait); 1881 1882 if (signal_pending(current)) { 1883 err = -ERESTARTSYS; 1884 break; 1885 } 1886 } 1887 1888 spin_unlock_irq(&tu->qlock); 1889 if (err < 0) 1890 goto _error; 1891 1892 if (tu->tread) { 1893 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1894 sizeof(struct snd_timer_tread))) { 1895 err = -EFAULT; 1896 goto _error; 1897 } 1898 } else { 1899 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1900 sizeof(struct snd_timer_read))) { 1901 err = -EFAULT; 1902 goto _error; 1903 } 1904 } 1905 1906 tu->qhead %= tu->queue_size; 1907 1908 result += unit; 1909 buffer += unit; 1910 1911 spin_lock_irq(&tu->qlock); 1912 tu->qused--; 1913 } 1914 spin_unlock_irq(&tu->qlock); 1915 _error: 1916 return result > 0 ? result : err; 1917 } 1918 1919 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1920 { 1921 unsigned int mask; 1922 struct snd_timer_user *tu; 1923 1924 tu = file->private_data; 1925 1926 poll_wait(file, &tu->qchange_sleep, wait); 1927 1928 mask = 0; 1929 if (tu->qused) 1930 mask |= POLLIN | POLLRDNORM; 1931 1932 return mask; 1933 } 1934 1935 #ifdef CONFIG_COMPAT 1936 #include "timer_compat.c" 1937 #else 1938 #define snd_timer_user_ioctl_compat NULL 1939 #endif 1940 1941 static struct file_operations snd_timer_f_ops = 1942 { 1943 .owner = THIS_MODULE, 1944 .read = snd_timer_user_read, 1945 .open = snd_timer_user_open, 1946 .release = snd_timer_user_release, 1947 .poll = snd_timer_user_poll, 1948 .unlocked_ioctl = snd_timer_user_ioctl, 1949 .compat_ioctl = snd_timer_user_ioctl_compat, 1950 .fasync = snd_timer_user_fasync, 1951 }; 1952 1953 /* 1954 * ENTRY functions 1955 */ 1956 1957 static int __init alsa_timer_init(void) 1958 { 1959 int err; 1960 1961 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1962 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 1963 "system timer"); 1964 #endif 1965 1966 if ((err = snd_timer_register_system()) < 0) 1967 snd_printk(KERN_ERR "unable to register system timer (%i)\n", 1968 err); 1969 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 1970 &snd_timer_f_ops, NULL, "timer")) < 0) 1971 snd_printk(KERN_ERR "unable to register timer device (%i)\n", 1972 err); 1973 snd_timer_proc_init(); 1974 return 0; 1975 } 1976 1977 static void __exit alsa_timer_exit(void) 1978 { 1979 struct list_head *p, *n; 1980 1981 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 1982 /* unregister the system timer */ 1983 list_for_each_safe(p, n, &snd_timer_list) { 1984 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list); 1985 snd_timer_unregister(timer); 1986 } 1987 snd_timer_proc_done(); 1988 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1989 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1990 #endif 1991 } 1992 1993 module_init(alsa_timer_init) 1994 module_exit(alsa_timer_exit) 1995 1996 EXPORT_SYMBOL(snd_timer_open); 1997 EXPORT_SYMBOL(snd_timer_close); 1998 EXPORT_SYMBOL(snd_timer_resolution); 1999 EXPORT_SYMBOL(snd_timer_start); 2000 EXPORT_SYMBOL(snd_timer_stop); 2001 EXPORT_SYMBOL(snd_timer_continue); 2002 EXPORT_SYMBOL(snd_timer_pause); 2003 EXPORT_SYMBOL(snd_timer_new); 2004 EXPORT_SYMBOL(snd_timer_notify); 2005 EXPORT_SYMBOL(snd_timer_global_new); 2006 EXPORT_SYMBOL(snd_timer_global_free); 2007 EXPORT_SYMBOL(snd_timer_global_register); 2008 EXPORT_SYMBOL(snd_timer_global_unregister); 2009 EXPORT_SYMBOL(snd_timer_interrupt); 2010