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; 631 632 spin_lock(&timer->lock); 633 /* now process all callbacks */ 634 while (!list_empty(&timer->sack_list_head)) { 635 p = timer->sack_list_head.next; /* get first item */ 636 ti = list_entry(p, struct snd_timer_instance, ack_list); 637 638 /* remove from ack_list and make empty */ 639 list_del_init(p); 640 641 ticks = ti->pticks; 642 ti->pticks = 0; 643 resolution = ti->resolution; 644 645 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 646 spin_unlock(&timer->lock); 647 if (ti->callback) 648 ti->callback(ti, resolution, ticks); 649 spin_lock(&timer->lock); 650 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 651 } 652 spin_unlock(&timer->lock); 653 } 654 655 /* 656 * timer interrupt 657 * 658 * ticks_left is usually equal to timer->sticks. 659 * 660 */ 661 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 662 { 663 struct snd_timer_instance *ti, *ts; 664 unsigned long resolution, ticks; 665 struct list_head *p, *q, *n, *ack_list_head; 666 unsigned long flags; 667 int use_tasklet = 0; 668 669 if (timer == NULL) 670 return; 671 672 spin_lock_irqsave(&timer->lock, flags); 673 674 /* remember the current resolution */ 675 if (timer->hw.c_resolution) 676 resolution = timer->hw.c_resolution(timer); 677 else 678 resolution = timer->hw.resolution; 679 680 /* loop for all active instances 681 * Here we cannot use list_for_each because the active_list of a 682 * processed instance is relinked to done_list_head before the callback 683 * is called. 684 */ 685 list_for_each_safe(p, n, &timer->active_list_head) { 686 ti = list_entry(p, struct snd_timer_instance, active_list); 687 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 688 continue; 689 ti->pticks += ticks_left; 690 ti->resolution = resolution; 691 if (ti->cticks < ticks_left) 692 ti->cticks = 0; 693 else 694 ti->cticks -= ticks_left; 695 if (ti->cticks) /* not expired */ 696 continue; 697 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 698 ti->cticks = ti->ticks; 699 } else { 700 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 701 if (--timer->running) 702 list_del(p); 703 } 704 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 705 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 706 ack_list_head = &timer->ack_list_head; 707 else 708 ack_list_head = &timer->sack_list_head; 709 if (list_empty(&ti->ack_list)) 710 list_add_tail(&ti->ack_list, ack_list_head); 711 list_for_each(q, &ti->slave_active_head) { 712 ts = list_entry(q, struct snd_timer_instance, active_list); 713 ts->pticks = ti->pticks; 714 ts->resolution = resolution; 715 if (list_empty(&ts->ack_list)) 716 list_add_tail(&ts->ack_list, ack_list_head); 717 } 718 } 719 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 720 snd_timer_reschedule(timer, ticks_left); 721 if (timer->running) { 722 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 723 timer->hw.stop(timer); 724 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 725 } 726 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 727 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 728 /* restart timer */ 729 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 730 timer->hw.start(timer); 731 } 732 } else { 733 timer->hw.stop(timer); 734 } 735 736 /* now process all fast callbacks */ 737 while (!list_empty(&timer->ack_list_head)) { 738 p = timer->ack_list_head.next; /* get first item */ 739 ti = list_entry(p, struct snd_timer_instance, ack_list); 740 741 /* remove from ack_list and make empty */ 742 list_del_init(p); 743 744 ticks = ti->pticks; 745 ti->pticks = 0; 746 747 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 748 spin_unlock(&timer->lock); 749 if (ti->callback) 750 ti->callback(ti, resolution, ticks); 751 spin_lock(&timer->lock); 752 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 753 } 754 755 /* do we have any slow callbacks? */ 756 use_tasklet = !list_empty(&timer->sack_list_head); 757 spin_unlock_irqrestore(&timer->lock, flags); 758 759 if (use_tasklet) 760 tasklet_hi_schedule(&timer->task_queue); 761 } 762 763 /* 764 765 */ 766 767 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 768 struct snd_timer **rtimer) 769 { 770 struct snd_timer *timer; 771 int err; 772 static struct snd_device_ops ops = { 773 .dev_free = snd_timer_dev_free, 774 .dev_register = snd_timer_dev_register, 775 .dev_unregister = snd_timer_dev_unregister 776 }; 777 778 snd_assert(tid != NULL, return -EINVAL); 779 snd_assert(rtimer != NULL, return -EINVAL); 780 *rtimer = NULL; 781 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 782 if (timer == NULL) { 783 snd_printk(KERN_ERR "timer: cannot allocate\n"); 784 return -ENOMEM; 785 } 786 timer->tmr_class = tid->dev_class; 787 timer->card = card; 788 timer->tmr_device = tid->device; 789 timer->tmr_subdevice = tid->subdevice; 790 if (id) 791 strlcpy(timer->id, id, sizeof(timer->id)); 792 INIT_LIST_HEAD(&timer->device_list); 793 INIT_LIST_HEAD(&timer->open_list_head); 794 INIT_LIST_HEAD(&timer->active_list_head); 795 INIT_LIST_HEAD(&timer->ack_list_head); 796 INIT_LIST_HEAD(&timer->sack_list_head); 797 spin_lock_init(&timer->lock); 798 tasklet_init(&timer->task_queue, snd_timer_tasklet, 799 (unsigned long)timer); 800 if (card != NULL) { 801 timer->module = card->module; 802 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 803 if (err < 0) { 804 snd_timer_free(timer); 805 return err; 806 } 807 } 808 *rtimer = timer; 809 return 0; 810 } 811 812 static int snd_timer_free(struct snd_timer *timer) 813 { 814 snd_assert(timer != NULL, return -ENXIO); 815 if (timer->private_free) 816 timer->private_free(timer); 817 kfree(timer); 818 return 0; 819 } 820 821 static int snd_timer_dev_free(struct snd_device *device) 822 { 823 struct snd_timer *timer = device->device_data; 824 return snd_timer_free(timer); 825 } 826 827 static int snd_timer_dev_register(struct snd_device *dev) 828 { 829 struct snd_timer *timer = dev->device_data; 830 struct snd_timer *timer1; 831 struct list_head *p; 832 833 snd_assert(timer != NULL && timer->hw.start != NULL && 834 timer->hw.stop != NULL, return -ENXIO); 835 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 836 !timer->hw.resolution && timer->hw.c_resolution == NULL) 837 return -EINVAL; 838 839 mutex_lock(®ister_mutex); 840 list_for_each(p, &snd_timer_list) { 841 timer1 = list_entry(p, struct snd_timer, device_list); 842 if (timer1->tmr_class > timer->tmr_class) 843 break; 844 if (timer1->tmr_class < timer->tmr_class) 845 continue; 846 if (timer1->card && timer->card) { 847 if (timer1->card->number > timer->card->number) 848 break; 849 if (timer1->card->number < timer->card->number) 850 continue; 851 } 852 if (timer1->tmr_device > timer->tmr_device) 853 break; 854 if (timer1->tmr_device < timer->tmr_device) 855 continue; 856 if (timer1->tmr_subdevice > timer->tmr_subdevice) 857 break; 858 if (timer1->tmr_subdevice < timer->tmr_subdevice) 859 continue; 860 /* conflicts.. */ 861 mutex_unlock(®ister_mutex); 862 return -EBUSY; 863 } 864 list_add_tail(&timer->device_list, p); 865 mutex_unlock(®ister_mutex); 866 return 0; 867 } 868 869 static int snd_timer_unregister(struct snd_timer *timer) 870 { 871 struct list_head *p, *n; 872 struct snd_timer_instance *ti; 873 874 snd_assert(timer != NULL, return -ENXIO); 875 mutex_lock(®ister_mutex); 876 if (! list_empty(&timer->open_list_head)) { 877 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer); 878 list_for_each_safe(p, n, &timer->open_list_head) { 879 list_del_init(p); 880 ti = list_entry(p, struct snd_timer_instance, open_list); 881 ti->timer = NULL; 882 } 883 } 884 list_del(&timer->device_list); 885 mutex_unlock(®ister_mutex); 886 return snd_timer_free(timer); 887 } 888 889 static int snd_timer_dev_unregister(struct snd_device *device) 890 { 891 struct snd_timer *timer = device->device_data; 892 return snd_timer_unregister(timer); 893 } 894 895 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 896 { 897 unsigned long flags; 898 unsigned long resolution = 0; 899 struct snd_timer_instance *ti, *ts; 900 struct list_head *p, *n; 901 902 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 903 return; 904 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && 905 event <= SNDRV_TIMER_EVENT_MRESUME, return); 906 spin_lock_irqsave(&timer->lock, flags); 907 if (event == SNDRV_TIMER_EVENT_MSTART || 908 event == SNDRV_TIMER_EVENT_MCONTINUE || 909 event == SNDRV_TIMER_EVENT_MRESUME) { 910 if (timer->hw.c_resolution) 911 resolution = timer->hw.c_resolution(timer); 912 else 913 resolution = timer->hw.resolution; 914 } 915 list_for_each(p, &timer->active_list_head) { 916 ti = list_entry(p, struct snd_timer_instance, active_list); 917 if (ti->ccallback) 918 ti->ccallback(ti, event, tstamp, resolution); 919 list_for_each(n, &ti->slave_active_head) { 920 ts = list_entry(n, struct snd_timer_instance, active_list); 921 if (ts->ccallback) 922 ts->ccallback(ts, event, tstamp, resolution); 923 } 924 } 925 spin_unlock_irqrestore(&timer->lock, flags); 926 } 927 928 /* 929 * exported functions for global timers 930 */ 931 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 932 { 933 struct snd_timer_id tid; 934 935 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 936 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 937 tid.card = -1; 938 tid.device = device; 939 tid.subdevice = 0; 940 return snd_timer_new(NULL, id, &tid, rtimer); 941 } 942 943 int snd_timer_global_free(struct snd_timer *timer) 944 { 945 return snd_timer_free(timer); 946 } 947 948 int snd_timer_global_register(struct snd_timer *timer) 949 { 950 struct snd_device dev; 951 952 memset(&dev, 0, sizeof(dev)); 953 dev.device_data = timer; 954 return snd_timer_dev_register(&dev); 955 } 956 957 int snd_timer_global_unregister(struct snd_timer *timer) 958 { 959 return snd_timer_unregister(timer); 960 } 961 962 /* 963 * System timer 964 */ 965 966 struct snd_timer_system_private { 967 struct timer_list tlist; 968 struct timer * timer; 969 unsigned long last_expires; 970 unsigned long last_jiffies; 971 unsigned long correction; 972 }; 973 974 static void snd_timer_s_function(unsigned long data) 975 { 976 struct snd_timer *timer = (struct snd_timer *)data; 977 struct snd_timer_system_private *priv = timer->private_data; 978 unsigned long jiff = jiffies; 979 if (time_after(jiff, priv->last_expires)) 980 priv->correction = (long)jiff - (long)priv->last_expires; 981 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 982 } 983 984 static int snd_timer_s_start(struct snd_timer * timer) 985 { 986 struct snd_timer_system_private *priv; 987 unsigned long njiff; 988 989 priv = (struct snd_timer_system_private *) timer->private_data; 990 njiff = (priv->last_jiffies = jiffies); 991 if (priv->correction > timer->sticks - 1) { 992 priv->correction -= timer->sticks - 1; 993 njiff++; 994 } else { 995 njiff += timer->sticks - priv->correction; 996 priv->correction -= timer->sticks; 997 } 998 priv->last_expires = priv->tlist.expires = njiff; 999 add_timer(&priv->tlist); 1000 return 0; 1001 } 1002 1003 static int snd_timer_s_stop(struct snd_timer * timer) 1004 { 1005 struct snd_timer_system_private *priv; 1006 unsigned long jiff; 1007 1008 priv = (struct snd_timer_system_private *) timer->private_data; 1009 del_timer(&priv->tlist); 1010 jiff = jiffies; 1011 if (time_before(jiff, priv->last_expires)) 1012 timer->sticks = priv->last_expires - jiff; 1013 else 1014 timer->sticks = 1; 1015 return 0; 1016 } 1017 1018 static struct snd_timer_hardware snd_timer_system = 1019 { 1020 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1021 .resolution = 1000000000L / HZ, 1022 .ticks = 10000000L, 1023 .start = snd_timer_s_start, 1024 .stop = snd_timer_s_stop 1025 }; 1026 1027 static void snd_timer_free_system(struct snd_timer *timer) 1028 { 1029 kfree(timer->private_data); 1030 } 1031 1032 static int snd_timer_register_system(void) 1033 { 1034 struct snd_timer *timer; 1035 struct snd_timer_system_private *priv; 1036 int err; 1037 1038 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1039 if (err < 0) 1040 return err; 1041 strcpy(timer->name, "system timer"); 1042 timer->hw = snd_timer_system; 1043 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1044 if (priv == NULL) { 1045 snd_timer_free(timer); 1046 return -ENOMEM; 1047 } 1048 init_timer(&priv->tlist); 1049 priv->tlist.function = snd_timer_s_function; 1050 priv->tlist.data = (unsigned long) timer; 1051 timer->private_data = priv; 1052 timer->private_free = snd_timer_free_system; 1053 return snd_timer_global_register(timer); 1054 } 1055 1056 #ifdef CONFIG_PROC_FS 1057 /* 1058 * Info interface 1059 */ 1060 1061 static void snd_timer_proc_read(struct snd_info_entry *entry, 1062 struct snd_info_buffer *buffer) 1063 { 1064 struct snd_timer *timer; 1065 struct snd_timer_instance *ti; 1066 struct list_head *p, *q; 1067 1068 mutex_lock(®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 list_for_each(q, &timer->open_list_head) { 1098 ti = list_entry(q, struct snd_timer_instance, open_list); 1099 snd_iprintf(buffer, " Client %s : %s\n", 1100 ti->owner ? ti->owner : "unknown", 1101 ti->flags & (SNDRV_TIMER_IFLG_START | 1102 SNDRV_TIMER_IFLG_RUNNING) 1103 ? "running" : "stopped"); 1104 } 1105 } 1106 mutex_unlock(®ister_mutex); 1107 } 1108 1109 static struct snd_info_entry *snd_timer_proc_entry; 1110 1111 static void __init snd_timer_proc_init(void) 1112 { 1113 struct snd_info_entry *entry; 1114 1115 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1116 if (entry != NULL) { 1117 entry->c.text.read = snd_timer_proc_read; 1118 if (snd_info_register(entry) < 0) { 1119 snd_info_free_entry(entry); 1120 entry = NULL; 1121 } 1122 } 1123 snd_timer_proc_entry = entry; 1124 } 1125 1126 static void __exit snd_timer_proc_done(void) 1127 { 1128 snd_info_unregister(snd_timer_proc_entry); 1129 } 1130 #else /* !CONFIG_PROC_FS */ 1131 #define snd_timer_proc_init() 1132 #define snd_timer_proc_done() 1133 #endif 1134 1135 /* 1136 * USER SPACE interface 1137 */ 1138 1139 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1140 unsigned long resolution, 1141 unsigned long ticks) 1142 { 1143 struct snd_timer_user *tu = timeri->callback_data; 1144 struct snd_timer_read *r; 1145 int prev; 1146 1147 spin_lock(&tu->qlock); 1148 if (tu->qused > 0) { 1149 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1150 r = &tu->queue[prev]; 1151 if (r->resolution == resolution) { 1152 r->ticks += ticks; 1153 goto __wake; 1154 } 1155 } 1156 if (tu->qused >= tu->queue_size) { 1157 tu->overrun++; 1158 } else { 1159 r = &tu->queue[tu->qtail++]; 1160 tu->qtail %= tu->queue_size; 1161 r->resolution = resolution; 1162 r->ticks = ticks; 1163 tu->qused++; 1164 } 1165 __wake: 1166 spin_unlock(&tu->qlock); 1167 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1168 wake_up(&tu->qchange_sleep); 1169 } 1170 1171 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1172 struct snd_timer_tread *tread) 1173 { 1174 if (tu->qused >= tu->queue_size) { 1175 tu->overrun++; 1176 } else { 1177 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1178 tu->qtail %= tu->queue_size; 1179 tu->qused++; 1180 } 1181 } 1182 1183 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1184 int event, 1185 struct timespec *tstamp, 1186 unsigned long resolution) 1187 { 1188 struct snd_timer_user *tu = timeri->callback_data; 1189 struct snd_timer_tread r1; 1190 1191 if (event >= SNDRV_TIMER_EVENT_START && 1192 event <= SNDRV_TIMER_EVENT_PAUSE) 1193 tu->tstamp = *tstamp; 1194 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1195 return; 1196 r1.event = event; 1197 r1.tstamp = *tstamp; 1198 r1.val = resolution; 1199 spin_lock(&tu->qlock); 1200 snd_timer_user_append_to_tqueue(tu, &r1); 1201 spin_unlock(&tu->qlock); 1202 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1203 wake_up(&tu->qchange_sleep); 1204 } 1205 1206 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1207 unsigned long resolution, 1208 unsigned long ticks) 1209 { 1210 struct snd_timer_user *tu = timeri->callback_data; 1211 struct snd_timer_tread *r, r1; 1212 struct timespec tstamp; 1213 int prev, append = 0; 1214 1215 memset(&tstamp, 0, sizeof(tstamp)); 1216 spin_lock(&tu->qlock); 1217 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1218 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1219 spin_unlock(&tu->qlock); 1220 return; 1221 } 1222 if (tu->last_resolution != resolution || ticks > 0) 1223 getnstimeofday(&tstamp); 1224 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1225 tu->last_resolution != resolution) { 1226 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1227 r1.tstamp = tstamp; 1228 r1.val = resolution; 1229 snd_timer_user_append_to_tqueue(tu, &r1); 1230 tu->last_resolution = resolution; 1231 append++; 1232 } 1233 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1234 goto __wake; 1235 if (ticks == 0) 1236 goto __wake; 1237 if (tu->qused > 0) { 1238 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1239 r = &tu->tqueue[prev]; 1240 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1241 r->tstamp = tstamp; 1242 r->val += ticks; 1243 append++; 1244 goto __wake; 1245 } 1246 } 1247 r1.event = SNDRV_TIMER_EVENT_TICK; 1248 r1.tstamp = tstamp; 1249 r1.val = ticks; 1250 snd_timer_user_append_to_tqueue(tu, &r1); 1251 append++; 1252 __wake: 1253 spin_unlock(&tu->qlock); 1254 if (append == 0) 1255 return; 1256 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1257 wake_up(&tu->qchange_sleep); 1258 } 1259 1260 static int snd_timer_user_open(struct inode *inode, struct file *file) 1261 { 1262 struct snd_timer_user *tu; 1263 1264 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1265 if (tu == NULL) 1266 return -ENOMEM; 1267 spin_lock_init(&tu->qlock); 1268 init_waitqueue_head(&tu->qchange_sleep); 1269 mutex_init(&tu->tread_sem); 1270 tu->ticks = 1; 1271 tu->queue_size = 128; 1272 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1273 GFP_KERNEL); 1274 if (tu->queue == NULL) { 1275 kfree(tu); 1276 return -ENOMEM; 1277 } 1278 file->private_data = tu; 1279 return 0; 1280 } 1281 1282 static int snd_timer_user_release(struct inode *inode, struct file *file) 1283 { 1284 struct snd_timer_user *tu; 1285 1286 if (file->private_data) { 1287 tu = file->private_data; 1288 file->private_data = NULL; 1289 fasync_helper(-1, file, 0, &tu->fasync); 1290 if (tu->timeri) 1291 snd_timer_close(tu->timeri); 1292 kfree(tu->queue); 1293 kfree(tu->tqueue); 1294 kfree(tu); 1295 } 1296 return 0; 1297 } 1298 1299 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1300 { 1301 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1302 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1303 id->card = -1; 1304 id->device = -1; 1305 id->subdevice = -1; 1306 } 1307 1308 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1309 { 1310 id->dev_class = timer->tmr_class; 1311 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1312 id->card = timer->card ? timer->card->number : -1; 1313 id->device = timer->tmr_device; 1314 id->subdevice = timer->tmr_subdevice; 1315 } 1316 1317 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1318 { 1319 struct snd_timer_id id; 1320 struct snd_timer *timer; 1321 struct list_head *p; 1322 1323 if (copy_from_user(&id, _tid, sizeof(id))) 1324 return -EFAULT; 1325 mutex_lock(®ister_mutex); 1326 if (id.dev_class < 0) { /* first item */ 1327 if (list_empty(&snd_timer_list)) 1328 snd_timer_user_zero_id(&id); 1329 else { 1330 timer = list_entry(snd_timer_list.next, 1331 struct snd_timer, device_list); 1332 snd_timer_user_copy_id(&id, timer); 1333 } 1334 } else { 1335 switch (id.dev_class) { 1336 case SNDRV_TIMER_CLASS_GLOBAL: 1337 id.device = id.device < 0 ? 0 : id.device + 1; 1338 list_for_each(p, &snd_timer_list) { 1339 timer = list_entry(p, struct snd_timer, device_list); 1340 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1341 snd_timer_user_copy_id(&id, timer); 1342 break; 1343 } 1344 if (timer->tmr_device >= id.device) { 1345 snd_timer_user_copy_id(&id, timer); 1346 break; 1347 } 1348 } 1349 if (p == &snd_timer_list) 1350 snd_timer_user_zero_id(&id); 1351 break; 1352 case SNDRV_TIMER_CLASS_CARD: 1353 case SNDRV_TIMER_CLASS_PCM: 1354 if (id.card < 0) { 1355 id.card = 0; 1356 } else { 1357 if (id.card < 0) { 1358 id.card = 0; 1359 } else { 1360 if (id.device < 0) { 1361 id.device = 0; 1362 } else { 1363 if (id.subdevice < 0) { 1364 id.subdevice = 0; 1365 } else { 1366 id.subdevice++; 1367 } 1368 } 1369 } 1370 } 1371 list_for_each(p, &snd_timer_list) { 1372 timer = list_entry(p, struct snd_timer, device_list); 1373 if (timer->tmr_class > id.dev_class) { 1374 snd_timer_user_copy_id(&id, timer); 1375 break; 1376 } 1377 if (timer->tmr_class < id.dev_class) 1378 continue; 1379 if (timer->card->number > id.card) { 1380 snd_timer_user_copy_id(&id, timer); 1381 break; 1382 } 1383 if (timer->card->number < id.card) 1384 continue; 1385 if (timer->tmr_device > id.device) { 1386 snd_timer_user_copy_id(&id, timer); 1387 break; 1388 } 1389 if (timer->tmr_device < id.device) 1390 continue; 1391 if (timer->tmr_subdevice > id.subdevice) { 1392 snd_timer_user_copy_id(&id, timer); 1393 break; 1394 } 1395 if (timer->tmr_subdevice < id.subdevice) 1396 continue; 1397 snd_timer_user_copy_id(&id, timer); 1398 break; 1399 } 1400 if (p == &snd_timer_list) 1401 snd_timer_user_zero_id(&id); 1402 break; 1403 default: 1404 snd_timer_user_zero_id(&id); 1405 } 1406 } 1407 mutex_unlock(®ister_mutex); 1408 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1409 return -EFAULT; 1410 return 0; 1411 } 1412 1413 static int snd_timer_user_ginfo(struct file *file, 1414 struct snd_timer_ginfo __user *_ginfo) 1415 { 1416 struct snd_timer_ginfo *ginfo; 1417 struct snd_timer_id tid; 1418 struct snd_timer *t; 1419 struct list_head *p; 1420 int err = 0; 1421 1422 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL); 1423 if (! ginfo) 1424 return -ENOMEM; 1425 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) { 1426 kfree(ginfo); 1427 return -EFAULT; 1428 } 1429 tid = ginfo->tid; 1430 memset(ginfo, 0, sizeof(*ginfo)); 1431 ginfo->tid = tid; 1432 mutex_lock(®ister_mutex); 1433 t = snd_timer_find(&tid); 1434 if (t != NULL) { 1435 ginfo->card = t->card ? t->card->number : -1; 1436 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1437 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1438 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1439 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1440 ginfo->resolution = t->hw.resolution; 1441 if (t->hw.resolution_min > 0) { 1442 ginfo->resolution_min = t->hw.resolution_min; 1443 ginfo->resolution_max = t->hw.resolution_max; 1444 } 1445 list_for_each(p, &t->open_list_head) { 1446 ginfo->clients++; 1447 } 1448 } else { 1449 err = -ENODEV; 1450 } 1451 mutex_unlock(®ister_mutex); 1452 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1453 err = -EFAULT; 1454 kfree(ginfo); 1455 return err; 1456 } 1457 1458 static int snd_timer_user_gparams(struct file *file, 1459 struct snd_timer_gparams __user *_gparams) 1460 { 1461 struct snd_timer_gparams gparams; 1462 struct snd_timer *t; 1463 int err; 1464 1465 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1466 return -EFAULT; 1467 mutex_lock(®ister_mutex); 1468 t = snd_timer_find(&gparams.tid); 1469 if (!t) { 1470 err = -ENODEV; 1471 goto _error; 1472 } 1473 if (!list_empty(&t->open_list_head)) { 1474 err = -EBUSY; 1475 goto _error; 1476 } 1477 if (!t->hw.set_period) { 1478 err = -ENOSYS; 1479 goto _error; 1480 } 1481 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1482 _error: 1483 mutex_unlock(®ister_mutex); 1484 return err; 1485 } 1486 1487 static int snd_timer_user_gstatus(struct file *file, 1488 struct snd_timer_gstatus __user *_gstatus) 1489 { 1490 struct snd_timer_gstatus gstatus; 1491 struct snd_timer_id tid; 1492 struct snd_timer *t; 1493 int err = 0; 1494 1495 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1496 return -EFAULT; 1497 tid = gstatus.tid; 1498 memset(&gstatus, 0, sizeof(gstatus)); 1499 gstatus.tid = tid; 1500 mutex_lock(®ister_mutex); 1501 t = snd_timer_find(&tid); 1502 if (t != NULL) { 1503 if (t->hw.c_resolution) 1504 gstatus.resolution = t->hw.c_resolution(t); 1505 else 1506 gstatus.resolution = t->hw.resolution; 1507 if (t->hw.precise_resolution) { 1508 t->hw.precise_resolution(t, &gstatus.resolution_num, 1509 &gstatus.resolution_den); 1510 } else { 1511 gstatus.resolution_num = gstatus.resolution; 1512 gstatus.resolution_den = 1000000000uL; 1513 } 1514 } else { 1515 err = -ENODEV; 1516 } 1517 mutex_unlock(®ister_mutex); 1518 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1519 err = -EFAULT; 1520 return err; 1521 } 1522 1523 static int snd_timer_user_tselect(struct file *file, 1524 struct snd_timer_select __user *_tselect) 1525 { 1526 struct snd_timer_user *tu; 1527 struct snd_timer_select tselect; 1528 char str[32]; 1529 int err = 0; 1530 1531 tu = file->private_data; 1532 mutex_lock(&tu->tread_sem); 1533 if (tu->timeri) { 1534 snd_timer_close(tu->timeri); 1535 tu->timeri = NULL; 1536 } 1537 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1538 err = -EFAULT; 1539 goto __err; 1540 } 1541 sprintf(str, "application %i", current->pid); 1542 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1543 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1544 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1545 if (err < 0) 1546 goto __err; 1547 1548 kfree(tu->queue); 1549 tu->queue = NULL; 1550 kfree(tu->tqueue); 1551 tu->tqueue = NULL; 1552 if (tu->tread) { 1553 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1554 GFP_KERNEL); 1555 if (tu->tqueue == NULL) 1556 err = -ENOMEM; 1557 } else { 1558 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1559 GFP_KERNEL); 1560 if (tu->queue == NULL) 1561 err = -ENOMEM; 1562 } 1563 1564 if (err < 0) { 1565 snd_timer_close(tu->timeri); 1566 tu->timeri = NULL; 1567 } else { 1568 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1569 tu->timeri->callback = tu->tread 1570 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1571 tu->timeri->ccallback = snd_timer_user_ccallback; 1572 tu->timeri->callback_data = (void *)tu; 1573 } 1574 1575 __err: 1576 mutex_unlock(&tu->tread_sem); 1577 return err; 1578 } 1579 1580 static int snd_timer_user_info(struct file *file, 1581 struct snd_timer_info __user *_info) 1582 { 1583 struct snd_timer_user *tu; 1584 struct snd_timer_info *info; 1585 struct snd_timer *t; 1586 int err = 0; 1587 1588 tu = file->private_data; 1589 snd_assert(tu->timeri != NULL, return -ENXIO); 1590 t = tu->timeri->timer; 1591 snd_assert(t != NULL, return -ENXIO); 1592 1593 info = kzalloc(sizeof(*info), GFP_KERNEL); 1594 if (! info) 1595 return -ENOMEM; 1596 info->card = t->card ? t->card->number : -1; 1597 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1598 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1599 strlcpy(info->id, t->id, sizeof(info->id)); 1600 strlcpy(info->name, t->name, sizeof(info->name)); 1601 info->resolution = t->hw.resolution; 1602 if (copy_to_user(_info, info, sizeof(*_info))) 1603 err = -EFAULT; 1604 kfree(info); 1605 return err; 1606 } 1607 1608 static int snd_timer_user_params(struct file *file, 1609 struct snd_timer_params __user *_params) 1610 { 1611 struct snd_timer_user *tu; 1612 struct snd_timer_params params; 1613 struct snd_timer *t; 1614 struct snd_timer_read *tr; 1615 struct snd_timer_tread *ttr; 1616 int err; 1617 1618 tu = file->private_data; 1619 snd_assert(tu->timeri != NULL, return -ENXIO); 1620 t = tu->timeri->timer; 1621 snd_assert(t != NULL, return -ENXIO); 1622 if (copy_from_user(¶ms, _params, sizeof(params))) 1623 return -EFAULT; 1624 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1625 err = -EINVAL; 1626 goto _end; 1627 } 1628 if (params.queue_size > 0 && 1629 (params.queue_size < 32 || params.queue_size > 1024)) { 1630 err = -EINVAL; 1631 goto _end; 1632 } 1633 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1634 (1<<SNDRV_TIMER_EVENT_TICK)| 1635 (1<<SNDRV_TIMER_EVENT_START)| 1636 (1<<SNDRV_TIMER_EVENT_STOP)| 1637 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1638 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1639 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1640 (1<<SNDRV_TIMER_EVENT_RESUME)| 1641 (1<<SNDRV_TIMER_EVENT_MSTART)| 1642 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1643 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1644 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1645 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1646 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1647 err = -EINVAL; 1648 goto _end; 1649 } 1650 snd_timer_stop(tu->timeri); 1651 spin_lock_irq(&t->lock); 1652 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1653 SNDRV_TIMER_IFLG_EXCLUSIVE| 1654 SNDRV_TIMER_IFLG_EARLY_EVENT); 1655 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1656 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1657 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1658 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1659 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1660 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1661 spin_unlock_irq(&t->lock); 1662 if (params.queue_size > 0 && 1663 (unsigned int)tu->queue_size != params.queue_size) { 1664 if (tu->tread) { 1665 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1666 GFP_KERNEL); 1667 if (ttr) { 1668 kfree(tu->tqueue); 1669 tu->queue_size = params.queue_size; 1670 tu->tqueue = ttr; 1671 } 1672 } else { 1673 tr = kmalloc(params.queue_size * sizeof(*tr), 1674 GFP_KERNEL); 1675 if (tr) { 1676 kfree(tu->queue); 1677 tu->queue_size = params.queue_size; 1678 tu->queue = tr; 1679 } 1680 } 1681 } 1682 tu->qhead = tu->qtail = tu->qused = 0; 1683 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1684 if (tu->tread) { 1685 struct snd_timer_tread tread; 1686 tread.event = SNDRV_TIMER_EVENT_EARLY; 1687 tread.tstamp.tv_sec = 0; 1688 tread.tstamp.tv_nsec = 0; 1689 tread.val = 0; 1690 snd_timer_user_append_to_tqueue(tu, &tread); 1691 } else { 1692 struct snd_timer_read *r = &tu->queue[0]; 1693 r->resolution = 0; 1694 r->ticks = 0; 1695 tu->qused++; 1696 tu->qtail++; 1697 } 1698 } 1699 tu->filter = params.filter; 1700 tu->ticks = params.ticks; 1701 err = 0; 1702 _end: 1703 if (copy_to_user(_params, ¶ms, sizeof(params))) 1704 return -EFAULT; 1705 return err; 1706 } 1707 1708 static int snd_timer_user_status(struct file *file, 1709 struct snd_timer_status __user *_status) 1710 { 1711 struct snd_timer_user *tu; 1712 struct snd_timer_status status; 1713 1714 tu = file->private_data; 1715 snd_assert(tu->timeri != NULL, return -ENXIO); 1716 memset(&status, 0, sizeof(status)); 1717 status.tstamp = tu->tstamp; 1718 status.resolution = snd_timer_resolution(tu->timeri); 1719 status.lost = tu->timeri->lost; 1720 status.overrun = tu->overrun; 1721 spin_lock_irq(&tu->qlock); 1722 status.queue = tu->qused; 1723 spin_unlock_irq(&tu->qlock); 1724 if (copy_to_user(_status, &status, sizeof(status))) 1725 return -EFAULT; 1726 return 0; 1727 } 1728 1729 static int snd_timer_user_start(struct file *file) 1730 { 1731 int err; 1732 struct snd_timer_user *tu; 1733 1734 tu = file->private_data; 1735 snd_assert(tu->timeri != NULL, return -ENXIO); 1736 snd_timer_stop(tu->timeri); 1737 tu->timeri->lost = 0; 1738 tu->last_resolution = 0; 1739 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1740 } 1741 1742 static int snd_timer_user_stop(struct file *file) 1743 { 1744 int err; 1745 struct snd_timer_user *tu; 1746 1747 tu = file->private_data; 1748 snd_assert(tu->timeri != NULL, return -ENXIO); 1749 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1750 } 1751 1752 static int snd_timer_user_continue(struct file *file) 1753 { 1754 int err; 1755 struct snd_timer_user *tu; 1756 1757 tu = file->private_data; 1758 snd_assert(tu->timeri != NULL, return -ENXIO); 1759 tu->timeri->lost = 0; 1760 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1761 } 1762 1763 static int snd_timer_user_pause(struct file *file) 1764 { 1765 int err; 1766 struct snd_timer_user *tu; 1767 1768 tu = file->private_data; 1769 snd_assert(tu->timeri != NULL, return -ENXIO); 1770 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1771 } 1772 1773 enum { 1774 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1775 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1776 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1777 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1778 }; 1779 1780 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1781 unsigned long arg) 1782 { 1783 struct snd_timer_user *tu; 1784 void __user *argp = (void __user *)arg; 1785 int __user *p = argp; 1786 1787 tu = file->private_data; 1788 switch (cmd) { 1789 case SNDRV_TIMER_IOCTL_PVERSION: 1790 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1791 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1792 return snd_timer_user_next_device(argp); 1793 case SNDRV_TIMER_IOCTL_TREAD: 1794 { 1795 int xarg; 1796 1797 mutex_lock(&tu->tread_sem); 1798 if (tu->timeri) { /* too late */ 1799 mutex_unlock(&tu->tread_sem); 1800 return -EBUSY; 1801 } 1802 if (get_user(xarg, p)) { 1803 mutex_unlock(&tu->tread_sem); 1804 return -EFAULT; 1805 } 1806 tu->tread = xarg ? 1 : 0; 1807 mutex_unlock(&tu->tread_sem); 1808 return 0; 1809 } 1810 case SNDRV_TIMER_IOCTL_GINFO: 1811 return snd_timer_user_ginfo(file, argp); 1812 case SNDRV_TIMER_IOCTL_GPARAMS: 1813 return snd_timer_user_gparams(file, argp); 1814 case SNDRV_TIMER_IOCTL_GSTATUS: 1815 return snd_timer_user_gstatus(file, argp); 1816 case SNDRV_TIMER_IOCTL_SELECT: 1817 return snd_timer_user_tselect(file, argp); 1818 case SNDRV_TIMER_IOCTL_INFO: 1819 return snd_timer_user_info(file, argp); 1820 case SNDRV_TIMER_IOCTL_PARAMS: 1821 return snd_timer_user_params(file, argp); 1822 case SNDRV_TIMER_IOCTL_STATUS: 1823 return snd_timer_user_status(file, argp); 1824 case SNDRV_TIMER_IOCTL_START: 1825 case SNDRV_TIMER_IOCTL_START_OLD: 1826 return snd_timer_user_start(file); 1827 case SNDRV_TIMER_IOCTL_STOP: 1828 case SNDRV_TIMER_IOCTL_STOP_OLD: 1829 return snd_timer_user_stop(file); 1830 case SNDRV_TIMER_IOCTL_CONTINUE: 1831 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1832 return snd_timer_user_continue(file); 1833 case SNDRV_TIMER_IOCTL_PAUSE: 1834 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1835 return snd_timer_user_pause(file); 1836 } 1837 return -ENOTTY; 1838 } 1839 1840 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1841 { 1842 struct snd_timer_user *tu; 1843 int err; 1844 1845 tu = file->private_data; 1846 err = fasync_helper(fd, file, on, &tu->fasync); 1847 if (err < 0) 1848 return err; 1849 return 0; 1850 } 1851 1852 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1853 size_t count, loff_t *offset) 1854 { 1855 struct snd_timer_user *tu; 1856 long result = 0, unit; 1857 int err = 0; 1858 1859 tu = file->private_data; 1860 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1861 spin_lock_irq(&tu->qlock); 1862 while ((long)count - result >= unit) { 1863 while (!tu->qused) { 1864 wait_queue_t wait; 1865 1866 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1867 err = -EAGAIN; 1868 break; 1869 } 1870 1871 set_current_state(TASK_INTERRUPTIBLE); 1872 init_waitqueue_entry(&wait, current); 1873 add_wait_queue(&tu->qchange_sleep, &wait); 1874 1875 spin_unlock_irq(&tu->qlock); 1876 schedule(); 1877 spin_lock_irq(&tu->qlock); 1878 1879 remove_wait_queue(&tu->qchange_sleep, &wait); 1880 1881 if (signal_pending(current)) { 1882 err = -ERESTARTSYS; 1883 break; 1884 } 1885 } 1886 1887 spin_unlock_irq(&tu->qlock); 1888 if (err < 0) 1889 goto _error; 1890 1891 if (tu->tread) { 1892 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1893 sizeof(struct snd_timer_tread))) { 1894 err = -EFAULT; 1895 goto _error; 1896 } 1897 } else { 1898 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1899 sizeof(struct snd_timer_read))) { 1900 err = -EFAULT; 1901 goto _error; 1902 } 1903 } 1904 1905 tu->qhead %= tu->queue_size; 1906 1907 result += unit; 1908 buffer += unit; 1909 1910 spin_lock_irq(&tu->qlock); 1911 tu->qused--; 1912 } 1913 spin_unlock_irq(&tu->qlock); 1914 _error: 1915 return result > 0 ? result : err; 1916 } 1917 1918 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1919 { 1920 unsigned int mask; 1921 struct snd_timer_user *tu; 1922 1923 tu = file->private_data; 1924 1925 poll_wait(file, &tu->qchange_sleep, wait); 1926 1927 mask = 0; 1928 if (tu->qused) 1929 mask |= POLLIN | POLLRDNORM; 1930 1931 return mask; 1932 } 1933 1934 #ifdef CONFIG_COMPAT 1935 #include "timer_compat.c" 1936 #else 1937 #define snd_timer_user_ioctl_compat NULL 1938 #endif 1939 1940 static struct file_operations snd_timer_f_ops = 1941 { 1942 .owner = THIS_MODULE, 1943 .read = snd_timer_user_read, 1944 .open = snd_timer_user_open, 1945 .release = snd_timer_user_release, 1946 .poll = snd_timer_user_poll, 1947 .unlocked_ioctl = snd_timer_user_ioctl, 1948 .compat_ioctl = snd_timer_user_ioctl_compat, 1949 .fasync = snd_timer_user_fasync, 1950 }; 1951 1952 /* 1953 * ENTRY functions 1954 */ 1955 1956 static int __init alsa_timer_init(void) 1957 { 1958 int err; 1959 1960 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1961 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 1962 "system timer"); 1963 #endif 1964 1965 if ((err = snd_timer_register_system()) < 0) 1966 snd_printk(KERN_ERR "unable to register system timer (%i)\n", 1967 err); 1968 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 1969 &snd_timer_f_ops, NULL, "timer")) < 0) 1970 snd_printk(KERN_ERR "unable to register timer device (%i)\n", 1971 err); 1972 snd_timer_proc_init(); 1973 return 0; 1974 } 1975 1976 static void __exit alsa_timer_exit(void) 1977 { 1978 struct list_head *p, *n; 1979 1980 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 1981 /* unregister the system timer */ 1982 list_for_each_safe(p, n, &snd_timer_list) { 1983 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list); 1984 snd_timer_unregister(timer); 1985 } 1986 snd_timer_proc_done(); 1987 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1988 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1989 #endif 1990 } 1991 1992 module_init(alsa_timer_init) 1993 module_exit(alsa_timer_exit) 1994 1995 EXPORT_SYMBOL(snd_timer_open); 1996 EXPORT_SYMBOL(snd_timer_close); 1997 EXPORT_SYMBOL(snd_timer_resolution); 1998 EXPORT_SYMBOL(snd_timer_start); 1999 EXPORT_SYMBOL(snd_timer_stop); 2000 EXPORT_SYMBOL(snd_timer_continue); 2001 EXPORT_SYMBOL(snd_timer_pause); 2002 EXPORT_SYMBOL(snd_timer_new); 2003 EXPORT_SYMBOL(snd_timer_notify); 2004 EXPORT_SYMBOL(snd_timer_global_new); 2005 EXPORT_SYMBOL(snd_timer_global_free); 2006 EXPORT_SYMBOL(snd_timer_global_register); 2007 EXPORT_SYMBOL(snd_timer_global_unregister); 2008 EXPORT_SYMBOL(snd_timer_interrupt); 2009