1 /* 2 * Timers abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <sound/driver.h> 23 #include <linux/delay.h> 24 #include <linux/init.h> 25 #include <linux/smp_lock.h> 26 #include <linux/slab.h> 27 #include <linux/time.h> 28 #include <linux/moduleparam.h> 29 #include <linux/string.h> 30 #include <sound/core.h> 31 #include <sound/timer.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/minors.h> 35 #include <sound/initval.h> 36 #include <linux/kmod.h> 37 #ifdef CONFIG_KERNELD 38 #include <linux/kerneld.h> 39 #endif 40 41 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE) 42 #define DEFAULT_TIMER_LIMIT 3 43 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE) 44 #define DEFAULT_TIMER_LIMIT 2 45 #else 46 #define DEFAULT_TIMER_LIMIT 1 47 #endif 48 49 static int timer_limit = DEFAULT_TIMER_LIMIT; 50 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>"); 51 MODULE_DESCRIPTION("ALSA timer interface"); 52 MODULE_LICENSE("GPL"); 53 module_param(timer_limit, int, 0444); 54 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 55 56 typedef struct { 57 snd_timer_instance_t *timeri; 58 int tread; /* enhanced read with timestamps and events */ 59 unsigned long ticks; 60 unsigned long overrun; 61 int qhead; 62 int qtail; 63 int qused; 64 int queue_size; 65 snd_timer_read_t *queue; 66 snd_timer_tread_t *tqueue; 67 spinlock_t qlock; 68 unsigned long last_resolution; 69 unsigned int filter; 70 struct timespec tstamp; /* trigger tstamp */ 71 wait_queue_head_t qchange_sleep; 72 struct fasync_struct *fasync; 73 struct semaphore tread_sem; 74 } snd_timer_user_t; 75 76 /* list of timers */ 77 static LIST_HEAD(snd_timer_list); 78 79 /* list of slave instances */ 80 static LIST_HEAD(snd_timer_slave_list); 81 82 /* lock for slave active lists */ 83 static DEFINE_SPINLOCK(slave_active_lock); 84 85 static DECLARE_MUTEX(register_mutex); 86 87 static int snd_timer_free(snd_timer_t *timer); 88 static int snd_timer_dev_free(snd_device_t *device); 89 static int snd_timer_dev_register(snd_device_t *device); 90 static int snd_timer_dev_unregister(snd_device_t *device); 91 92 static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left); 93 94 /* 95 * create a timer instance with the given owner string. 96 * when timer is not NULL, increments the module counter 97 */ 98 static snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *timer) 99 { 100 snd_timer_instance_t *timeri; 101 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 102 if (timeri == NULL) 103 return NULL; 104 timeri->owner = kstrdup(owner, GFP_KERNEL); 105 if (! timeri->owner) { 106 kfree(timeri); 107 return NULL; 108 } 109 INIT_LIST_HEAD(&timeri->open_list); 110 INIT_LIST_HEAD(&timeri->active_list); 111 INIT_LIST_HEAD(&timeri->ack_list); 112 INIT_LIST_HEAD(&timeri->slave_list_head); 113 INIT_LIST_HEAD(&timeri->slave_active_head); 114 115 timeri->timer = timer; 116 if (timer && timer->card && !try_module_get(timer->card->module)) { 117 kfree(timeri->owner); 118 kfree(timeri); 119 return NULL; 120 } 121 122 return timeri; 123 } 124 125 /* 126 * find a timer instance from the given timer id 127 */ 128 static snd_timer_t *snd_timer_find(snd_timer_id_t *tid) 129 { 130 snd_timer_t *timer = NULL; 131 struct list_head *p; 132 133 list_for_each(p, &snd_timer_list) { 134 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); 135 136 if (timer->tmr_class != tid->dev_class) 137 continue; 138 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 139 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 140 (timer->card == NULL || 141 timer->card->number != tid->card)) 142 continue; 143 if (timer->tmr_device != tid->device) 144 continue; 145 if (timer->tmr_subdevice != tid->subdevice) 146 continue; 147 return timer; 148 } 149 return NULL; 150 } 151 152 #ifdef CONFIG_KMOD 153 154 static void snd_timer_request(snd_timer_id_t *tid) 155 { 156 if (! current->fs->root) 157 return; 158 switch (tid->dev_class) { 159 case SNDRV_TIMER_CLASS_GLOBAL: 160 if (tid->device < timer_limit) 161 request_module("snd-timer-%i", tid->device); 162 break; 163 case SNDRV_TIMER_CLASS_CARD: 164 case SNDRV_TIMER_CLASS_PCM: 165 if (tid->card < snd_ecards_limit) 166 request_module("snd-card-%i", tid->card); 167 break; 168 default: 169 break; 170 } 171 } 172 173 #endif 174 175 /* 176 * look for a master instance matching with the slave id of the given slave. 177 * when found, relink the open_link of the slave. 178 * 179 * call this with register_mutex down. 180 */ 181 static void snd_timer_check_slave(snd_timer_instance_t *slave) 182 { 183 snd_timer_t *timer; 184 snd_timer_instance_t *master; 185 struct list_head *p, *q; 186 187 /* FIXME: it's really dumb to look up all entries.. */ 188 list_for_each(p, &snd_timer_list) { 189 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); 190 list_for_each(q, &timer->open_list_head) { 191 master = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list); 192 if (slave->slave_class == master->slave_class && 193 slave->slave_id == master->slave_id) { 194 list_del(&slave->open_list); 195 list_add_tail(&slave->open_list, &master->slave_list_head); 196 spin_lock_irq(&slave_active_lock); 197 slave->master = master; 198 slave->timer = master->timer; 199 spin_unlock_irq(&slave_active_lock); 200 return; 201 } 202 } 203 } 204 } 205 206 /* 207 * look for slave instances matching with the slave id of the given master. 208 * when found, relink the open_link of slaves. 209 * 210 * call this with register_mutex down. 211 */ 212 static void snd_timer_check_master(snd_timer_instance_t *master) 213 { 214 snd_timer_instance_t *slave; 215 struct list_head *p, *n; 216 217 /* check all pending slaves */ 218 list_for_each_safe(p, n, &snd_timer_slave_list) { 219 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); 220 if (slave->slave_class == master->slave_class && 221 slave->slave_id == master->slave_id) { 222 list_del(p); 223 list_add_tail(p, &master->slave_list_head); 224 spin_lock_irq(&slave_active_lock); 225 slave->master = master; 226 slave->timer = master->timer; 227 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 228 list_add_tail(&slave->active_list, &master->slave_active_head); 229 spin_unlock_irq(&slave_active_lock); 230 } 231 } 232 } 233 234 /* 235 * open a timer instance 236 * when opening a master, the slave id must be here given. 237 */ 238 int snd_timer_open(snd_timer_instance_t **ti, 239 char *owner, snd_timer_id_t *tid, 240 unsigned int slave_id) 241 { 242 snd_timer_t *timer; 243 snd_timer_instance_t *timeri = NULL; 244 245 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 246 /* open a slave instance */ 247 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 248 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 249 snd_printd("invalid slave class %i\n", tid->dev_sclass); 250 return -EINVAL; 251 } 252 down(®ister_mutex); 253 timeri = snd_timer_instance_new(owner, NULL); 254 timeri->slave_class = tid->dev_sclass; 255 timeri->slave_id = tid->device; 256 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 257 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 258 snd_timer_check_slave(timeri); 259 up(®ister_mutex); 260 *ti = timeri; 261 return 0; 262 } 263 264 /* open a master instance */ 265 down(®ister_mutex); 266 timer = snd_timer_find(tid); 267 #ifdef CONFIG_KMOD 268 if (timer == NULL) { 269 up(®ister_mutex); 270 snd_timer_request(tid); 271 down(®ister_mutex); 272 timer = snd_timer_find(tid); 273 } 274 #endif 275 if (timer) { 276 if (!list_empty(&timer->open_list_head)) { 277 timeri = (snd_timer_instance_t *)list_entry(timer->open_list_head.next, snd_timer_instance_t, open_list); 278 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 279 up(®ister_mutex); 280 return -EBUSY; 281 } 282 } 283 timeri = snd_timer_instance_new(owner, timer); 284 if (timeri) { 285 timeri->slave_class = tid->dev_sclass; 286 timeri->slave_id = slave_id; 287 if (list_empty(&timer->open_list_head) && timer->hw.open) 288 timer->hw.open(timer); 289 list_add_tail(&timeri->open_list, &timer->open_list_head); 290 snd_timer_check_master(timeri); 291 } 292 } else { 293 up(®ister_mutex); 294 return -ENODEV; 295 } 296 up(®ister_mutex); 297 *ti = timeri; 298 return 0; 299 } 300 301 static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event); 302 303 /* 304 * close a timer instance 305 */ 306 int snd_timer_close(snd_timer_instance_t * timeri) 307 { 308 snd_timer_t *timer = NULL; 309 struct list_head *p, *n; 310 snd_timer_instance_t *slave; 311 312 snd_assert(timeri != NULL, return -ENXIO); 313 314 /* force to stop the timer */ 315 snd_timer_stop(timeri); 316 317 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 318 /* wait, until the active callback is finished */ 319 spin_lock_irq(&slave_active_lock); 320 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 321 spin_unlock_irq(&slave_active_lock); 322 udelay(10); 323 spin_lock_irq(&slave_active_lock); 324 } 325 spin_unlock_irq(&slave_active_lock); 326 down(®ister_mutex); 327 list_del(&timeri->open_list); 328 up(®ister_mutex); 329 } else { 330 timer = timeri->timer; 331 /* wait, until the active callback is finished */ 332 spin_lock_irq(&timer->lock); 333 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 334 spin_unlock_irq(&timer->lock); 335 udelay(10); 336 spin_lock_irq(&timer->lock); 337 } 338 spin_unlock_irq(&timer->lock); 339 down(®ister_mutex); 340 list_del(&timeri->open_list); 341 if (timer && list_empty(&timer->open_list_head) && timer->hw.close) 342 timer->hw.close(timer); 343 /* remove slave links */ 344 list_for_each_safe(p, n, &timeri->slave_list_head) { 345 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); 346 spin_lock_irq(&slave_active_lock); 347 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); 348 list_del(p); 349 list_add_tail(p, &snd_timer_slave_list); 350 slave->master = NULL; 351 slave->timer = NULL; 352 spin_unlock_irq(&slave_active_lock); 353 } 354 up(®ister_mutex); 355 } 356 if (timeri->private_free) 357 timeri->private_free(timeri); 358 kfree(timeri->owner); 359 kfree(timeri); 360 if (timer && timer->card) 361 module_put(timer->card->module); 362 return 0; 363 } 364 365 unsigned long snd_timer_resolution(snd_timer_instance_t * timeri) 366 { 367 snd_timer_t * timer; 368 369 if (timeri == NULL) 370 return 0; 371 if ((timer = timeri->timer) != NULL) { 372 if (timer->hw.c_resolution) 373 return timer->hw.c_resolution(timer); 374 return timer->hw.resolution; 375 } 376 return 0; 377 } 378 379 static void snd_timer_notify1(snd_timer_instance_t *ti, enum sndrv_timer_event event) 380 { 381 snd_timer_t *timer; 382 unsigned long flags; 383 unsigned long resolution = 0; 384 snd_timer_instance_t *ts; 385 struct list_head *n; 386 struct timespec tstamp; 387 388 snd_timestamp_now(&tstamp, 1); 389 snd_assert(event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE, return); 390 if (event == SNDRV_TIMER_EVENT_START || event == SNDRV_TIMER_EVENT_CONTINUE) 391 resolution = snd_timer_resolution(ti); 392 if (ti->ccallback) 393 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution); 394 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 395 return; 396 timer = ti->timer; 397 if (timer == NULL) 398 return; 399 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 400 return; 401 spin_lock_irqsave(&timer->lock, flags); 402 list_for_each(n, &ti->slave_active_head) { 403 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list); 404 if (ts->ccallback) 405 ts->ccallback(ti, event + 100, &tstamp, resolution); 406 } 407 spin_unlock_irqrestore(&timer->lock, flags); 408 } 409 410 static int snd_timer_start1(snd_timer_t *timer, snd_timer_instance_t *timeri, unsigned long sticks) 411 { 412 list_del(&timeri->active_list); 413 list_add_tail(&timeri->active_list, &timer->active_list_head); 414 if (timer->running) { 415 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 416 goto __start_now; 417 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 418 timeri->flags |= SNDRV_TIMER_IFLG_START; 419 return 1; /* delayed start */ 420 } else { 421 timer->sticks = sticks; 422 timer->hw.start(timer); 423 __start_now: 424 timer->running++; 425 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 426 return 0; 427 } 428 } 429 430 static int snd_timer_start_slave(snd_timer_instance_t *timeri) 431 { 432 unsigned long flags; 433 434 spin_lock_irqsave(&slave_active_lock, flags); 435 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 436 if (timeri->master) 437 list_add_tail(&timeri->active_list, &timeri->master->slave_active_head); 438 spin_unlock_irqrestore(&slave_active_lock, flags); 439 return 1; /* delayed start */ 440 } 441 442 /* 443 * start the timer instance 444 */ 445 int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks) 446 { 447 snd_timer_t *timer; 448 int result = -EINVAL; 449 unsigned long flags; 450 451 if (timeri == NULL || ticks < 1) 452 return -EINVAL; 453 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 454 result = snd_timer_start_slave(timeri); 455 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 456 return result; 457 } 458 timer = timeri->timer; 459 if (timer == NULL) 460 return -EINVAL; 461 spin_lock_irqsave(&timer->lock, flags); 462 timeri->ticks = timeri->cticks = ticks; 463 timeri->pticks = 0; 464 result = snd_timer_start1(timer, timeri, ticks); 465 spin_unlock_irqrestore(&timer->lock, flags); 466 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 467 return result; 468 } 469 470 static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event) 471 { 472 snd_timer_t *timer; 473 unsigned long flags; 474 475 snd_assert(timeri != NULL, return -ENXIO); 476 477 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 478 if (!keep_flag) { 479 spin_lock_irqsave(&slave_active_lock, flags); 480 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 481 spin_unlock_irqrestore(&slave_active_lock, flags); 482 } 483 goto __end; 484 } 485 timer = timeri->timer; 486 if (!timer) 487 return -EINVAL; 488 spin_lock_irqsave(&timer->lock, flags); 489 list_del_init(&timeri->ack_list); 490 list_del_init(&timeri->active_list); 491 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 492 !(--timer->running)) { 493 timer->hw.stop(timer); 494 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 495 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 496 snd_timer_reschedule(timer, 0); 497 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 498 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 499 timer->hw.start(timer); 500 } 501 } 502 } 503 if (!keep_flag) 504 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING|SNDRV_TIMER_IFLG_START); 505 spin_unlock_irqrestore(&timer->lock, flags); 506 __end: 507 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 508 snd_timer_notify1(timeri, event); 509 return 0; 510 } 511 512 /* 513 * stop the timer instance. 514 * 515 * do not call this from the timer callback! 516 */ 517 int snd_timer_stop(snd_timer_instance_t * timeri) 518 { 519 snd_timer_t *timer; 520 unsigned long flags; 521 int err; 522 523 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); 524 if (err < 0) 525 return err; 526 timer = timeri->timer; 527 spin_lock_irqsave(&timer->lock, flags); 528 timeri->cticks = timeri->ticks; 529 timeri->pticks = 0; 530 spin_unlock_irqrestore(&timer->lock, flags); 531 return 0; 532 } 533 534 /* 535 * start again.. the tick is kept. 536 */ 537 int snd_timer_continue(snd_timer_instance_t * timeri) 538 { 539 snd_timer_t *timer; 540 int result = -EINVAL; 541 unsigned long flags; 542 543 if (timeri == NULL) 544 return result; 545 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 546 return snd_timer_start_slave(timeri); 547 timer = timeri->timer; 548 if (! timer) 549 return -EINVAL; 550 spin_lock_irqsave(&timer->lock, flags); 551 if (!timeri->cticks) 552 timeri->cticks = 1; 553 timeri->pticks = 0; 554 result = snd_timer_start1(timer, timeri, timer->sticks); 555 spin_unlock_irqrestore(&timer->lock, flags); 556 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 557 return result; 558 } 559 560 /* 561 * pause.. remember the ticks left 562 */ 563 int snd_timer_pause(snd_timer_instance_t * timeri) 564 { 565 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); 566 } 567 568 /* 569 * reschedule the timer 570 * 571 * start pending instances and check the scheduling ticks. 572 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 573 */ 574 static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left) 575 { 576 snd_timer_instance_t *ti; 577 unsigned long ticks = ~0UL; 578 struct list_head *p; 579 580 list_for_each(p, &timer->active_list_head) { 581 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); 582 if (ti->flags & SNDRV_TIMER_IFLG_START) { 583 ti->flags &= ~SNDRV_TIMER_IFLG_START; 584 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 585 timer->running++; 586 } 587 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 588 if (ticks > ti->cticks) 589 ticks = ti->cticks; 590 } 591 } 592 if (ticks == ~0UL) { 593 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 594 return; 595 } 596 if (ticks > timer->hw.ticks) 597 ticks = timer->hw.ticks; 598 if (ticks_left != ticks) 599 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 600 timer->sticks = ticks; 601 } 602 603 /* 604 * timer tasklet 605 * 606 */ 607 static void snd_timer_tasklet(unsigned long arg) 608 { 609 snd_timer_t *timer = (snd_timer_t *) arg; 610 snd_timer_instance_t *ti; 611 struct list_head *p; 612 unsigned long resolution, ticks; 613 614 spin_lock(&timer->lock); 615 /* now process all callbacks */ 616 while (!list_empty(&timer->sack_list_head)) { 617 p = timer->sack_list_head.next; /* get first item */ 618 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list); 619 620 /* remove from ack_list and make empty */ 621 list_del_init(p); 622 623 ticks = ti->pticks; 624 ti->pticks = 0; 625 resolution = ti->resolution; 626 627 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 628 spin_unlock(&timer->lock); 629 if (ti->callback) 630 ti->callback(ti, resolution, ticks); 631 spin_lock(&timer->lock); 632 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 633 } 634 spin_unlock(&timer->lock); 635 } 636 637 /* 638 * timer interrupt 639 * 640 * ticks_left is usually equal to timer->sticks. 641 * 642 */ 643 void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left) 644 { 645 snd_timer_instance_t *ti, *ts; 646 unsigned long resolution, ticks; 647 struct list_head *p, *q, *n; 648 int use_tasklet = 0; 649 650 if (timer == NULL) 651 return; 652 653 spin_lock(&timer->lock); 654 655 /* remember the current resolution */ 656 if (timer->hw.c_resolution) 657 resolution = timer->hw.c_resolution(timer); 658 else 659 resolution = timer->hw.resolution; 660 661 /* loop for all active instances 662 * here we cannot use list_for_each because the active_list of a processed 663 * instance is relinked to done_list_head before callback is called. 664 */ 665 list_for_each_safe(p, n, &timer->active_list_head) { 666 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); 667 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 668 continue; 669 ti->pticks += ticks_left; 670 ti->resolution = resolution; 671 if (ti->cticks < ticks_left) 672 ti->cticks = 0; 673 else 674 ti->cticks -= ticks_left; 675 if (ti->cticks) /* not expired */ 676 continue; 677 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 678 ti->cticks = ti->ticks; 679 } else { 680 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 681 if (--timer->running) 682 list_del(p); 683 } 684 if (list_empty(&ti->ack_list)) { 685 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 686 (ti->flags & SNDRV_TIMER_IFLG_FAST)) { 687 list_add_tail(&ti->ack_list, &timer->ack_list_head); 688 } else { 689 list_add_tail(&ti->ack_list, &timer->sack_list_head); 690 } 691 } 692 list_for_each(q, &ti->slave_active_head) { 693 ts = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, active_list); 694 ts->pticks = ti->pticks; 695 ts->resolution = resolution; 696 if (list_empty(&ts->ack_list)) { 697 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 698 (ti->flags & SNDRV_TIMER_IFLG_FAST)) { 699 list_add_tail(&ts->ack_list, &timer->ack_list_head); 700 } else { 701 list_add_tail(&ts->ack_list, &timer->sack_list_head); 702 } 703 } 704 } 705 } 706 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 707 snd_timer_reschedule(timer, ticks_left); 708 if (timer->running) { 709 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 710 timer->hw.stop(timer); 711 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 712 } 713 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 714 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 715 /* restart timer */ 716 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 717 timer->hw.start(timer); 718 } 719 } else { 720 timer->hw.stop(timer); 721 } 722 723 /* now process all fast callbacks */ 724 while (!list_empty(&timer->ack_list_head)) { 725 p = timer->ack_list_head.next; /* get first item */ 726 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list); 727 728 /* remove from ack_list and make empty */ 729 list_del_init(p); 730 731 ticks = ti->pticks; 732 ti->pticks = 0; 733 734 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 735 spin_unlock(&timer->lock); 736 if (ti->callback) 737 ti->callback(ti, resolution, ticks); 738 spin_lock(&timer->lock); 739 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 740 } 741 742 /* do we have any slow callbacks? */ 743 use_tasklet = !list_empty(&timer->sack_list_head); 744 spin_unlock(&timer->lock); 745 746 if (use_tasklet) 747 tasklet_hi_schedule(&timer->task_queue); 748 } 749 750 /* 751 752 */ 753 754 int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer) 755 { 756 snd_timer_t *timer; 757 int err; 758 static snd_device_ops_t ops = { 759 .dev_free = snd_timer_dev_free, 760 .dev_register = snd_timer_dev_register, 761 .dev_unregister = snd_timer_dev_unregister 762 }; 763 764 snd_assert(tid != NULL, return -EINVAL); 765 snd_assert(rtimer != NULL, return -EINVAL); 766 *rtimer = NULL; 767 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 768 if (timer == NULL) 769 return -ENOMEM; 770 timer->tmr_class = tid->dev_class; 771 timer->card = card; 772 timer->tmr_device = tid->device; 773 timer->tmr_subdevice = tid->subdevice; 774 if (id) 775 strlcpy(timer->id, id, sizeof(timer->id)); 776 INIT_LIST_HEAD(&timer->device_list); 777 INIT_LIST_HEAD(&timer->open_list_head); 778 INIT_LIST_HEAD(&timer->active_list_head); 779 INIT_LIST_HEAD(&timer->ack_list_head); 780 INIT_LIST_HEAD(&timer->sack_list_head); 781 spin_lock_init(&timer->lock); 782 tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer); 783 if (card != NULL) { 784 if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) { 785 snd_timer_free(timer); 786 return err; 787 } 788 } 789 *rtimer = timer; 790 return 0; 791 } 792 793 static int snd_timer_free(snd_timer_t *timer) 794 { 795 snd_assert(timer != NULL, return -ENXIO); 796 if (timer->private_free) 797 timer->private_free(timer); 798 kfree(timer); 799 return 0; 800 } 801 802 static int snd_timer_dev_free(snd_device_t *device) 803 { 804 snd_timer_t *timer = device->device_data; 805 return snd_timer_free(timer); 806 } 807 808 static int snd_timer_dev_register(snd_device_t *dev) 809 { 810 snd_timer_t *timer = dev->device_data; 811 snd_timer_t *timer1; 812 struct list_head *p; 813 814 snd_assert(timer != NULL && timer->hw.start != NULL && timer->hw.stop != NULL, return -ENXIO); 815 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 816 !timer->hw.resolution && timer->hw.c_resolution == NULL) 817 return -EINVAL; 818 819 down(®ister_mutex); 820 list_for_each(p, &snd_timer_list) { 821 timer1 = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); 822 if (timer1->tmr_class > timer->tmr_class) 823 break; 824 if (timer1->tmr_class < timer->tmr_class) 825 continue; 826 if (timer1->card && timer->card) { 827 if (timer1->card->number > timer->card->number) 828 break; 829 if (timer1->card->number < timer->card->number) 830 continue; 831 } 832 if (timer1->tmr_device > timer->tmr_device) 833 break; 834 if (timer1->tmr_device < timer->tmr_device) 835 continue; 836 if (timer1->tmr_subdevice > timer->tmr_subdevice) 837 break; 838 if (timer1->tmr_subdevice < timer->tmr_subdevice) 839 continue; 840 /* conflicts.. */ 841 up(®ister_mutex); 842 return -EBUSY; 843 } 844 list_add_tail(&timer->device_list, p); 845 up(®ister_mutex); 846 return 0; 847 } 848 849 static int snd_timer_unregister(snd_timer_t *timer) 850 { 851 struct list_head *p, *n; 852 snd_timer_instance_t *ti; 853 854 snd_assert(timer != NULL, return -ENXIO); 855 down(®ister_mutex); 856 if (! list_empty(&timer->open_list_head)) { 857 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer); 858 list_for_each_safe(p, n, &timer->open_list_head) { 859 list_del_init(p); 860 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); 861 ti->timer = NULL; 862 } 863 } 864 list_del(&timer->device_list); 865 up(®ister_mutex); 866 return snd_timer_free(timer); 867 } 868 869 static int snd_timer_dev_unregister(snd_device_t *device) 870 { 871 snd_timer_t *timer = device->device_data; 872 return snd_timer_unregister(timer); 873 } 874 875 void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp) 876 { 877 unsigned long flags; 878 unsigned long resolution = 0; 879 snd_timer_instance_t *ti, *ts; 880 struct list_head *p, *n; 881 882 snd_runtime_check(timer->hw.flags & SNDRV_TIMER_HW_SLAVE, return); 883 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && event <= SNDRV_TIMER_EVENT_MRESUME, return); 884 spin_lock_irqsave(&timer->lock, flags); 885 if (event == SNDRV_TIMER_EVENT_MSTART || 886 event == SNDRV_TIMER_EVENT_MCONTINUE || 887 event == SNDRV_TIMER_EVENT_MRESUME) { 888 if (timer->hw.c_resolution) 889 resolution = timer->hw.c_resolution(timer); 890 else 891 resolution = timer->hw.resolution; 892 } 893 list_for_each(p, &timer->active_list_head) { 894 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); 895 if (ti->ccallback) 896 ti->ccallback(ti, event, tstamp, resolution); 897 list_for_each(n, &ti->slave_active_head) { 898 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list); 899 if (ts->ccallback) 900 ts->ccallback(ts, event, tstamp, resolution); 901 } 902 } 903 spin_unlock_irqrestore(&timer->lock, flags); 904 } 905 906 /* 907 * exported functions for global timers 908 */ 909 int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer) 910 { 911 snd_timer_id_t tid; 912 913 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 914 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 915 tid.card = -1; 916 tid.device = device; 917 tid.subdevice = 0; 918 return snd_timer_new(NULL, id, &tid, rtimer); 919 } 920 921 int snd_timer_global_free(snd_timer_t *timer) 922 { 923 return snd_timer_free(timer); 924 } 925 926 int snd_timer_global_register(snd_timer_t *timer) 927 { 928 snd_device_t dev; 929 930 memset(&dev, 0, sizeof(dev)); 931 dev.device_data = timer; 932 return snd_timer_dev_register(&dev); 933 } 934 935 int snd_timer_global_unregister(snd_timer_t *timer) 936 { 937 return snd_timer_unregister(timer); 938 } 939 940 /* 941 * System timer 942 */ 943 944 struct snd_timer_system_private { 945 struct timer_list tlist; 946 struct timer * timer; 947 unsigned long last_expires; 948 unsigned long last_jiffies; 949 unsigned long correction; 950 }; 951 952 static void snd_timer_s_function(unsigned long data) 953 { 954 snd_timer_t *timer = (snd_timer_t *)data; 955 struct snd_timer_system_private *priv = timer->private_data; 956 unsigned long jiff = jiffies; 957 if (time_after(jiff, priv->last_expires)) 958 priv->correction = (long)jiff - (long)priv->last_expires; 959 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 960 } 961 962 static int snd_timer_s_start(snd_timer_t * timer) 963 { 964 struct snd_timer_system_private *priv; 965 unsigned long njiff; 966 967 priv = (struct snd_timer_system_private *) timer->private_data; 968 njiff = (priv->last_jiffies = jiffies); 969 if (priv->correction > timer->sticks - 1) { 970 priv->correction -= timer->sticks - 1; 971 njiff++; 972 } else { 973 njiff += timer->sticks - priv->correction; 974 priv->correction -= timer->sticks; 975 } 976 priv->last_expires = priv->tlist.expires = njiff; 977 add_timer(&priv->tlist); 978 return 0; 979 } 980 981 static int snd_timer_s_stop(snd_timer_t * timer) 982 { 983 struct snd_timer_system_private *priv; 984 unsigned long jiff; 985 986 priv = (struct snd_timer_system_private *) timer->private_data; 987 del_timer(&priv->tlist); 988 jiff = jiffies; 989 if (time_before(jiff, priv->last_expires)) 990 timer->sticks = priv->last_expires - jiff; 991 else 992 timer->sticks = 1; 993 return 0; 994 } 995 996 static struct _snd_timer_hardware snd_timer_system = 997 { 998 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 999 .resolution = 1000000000L / HZ, 1000 .ticks = 10000000L, 1001 .start = snd_timer_s_start, 1002 .stop = snd_timer_s_stop 1003 }; 1004 1005 static void snd_timer_free_system(snd_timer_t *timer) 1006 { 1007 kfree(timer->private_data); 1008 } 1009 1010 static int snd_timer_register_system(void) 1011 { 1012 snd_timer_t *timer; 1013 struct snd_timer_system_private *priv; 1014 int err; 1015 1016 if ((err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer)) < 0) 1017 return err; 1018 strcpy(timer->name, "system timer"); 1019 timer->hw = snd_timer_system; 1020 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1021 if (priv == NULL) { 1022 snd_timer_free(timer); 1023 return -ENOMEM; 1024 } 1025 init_timer(&priv->tlist); 1026 priv->tlist.function = snd_timer_s_function; 1027 priv->tlist.data = (unsigned long) timer; 1028 timer->private_data = priv; 1029 timer->private_free = snd_timer_free_system; 1030 return snd_timer_global_register(timer); 1031 } 1032 1033 /* 1034 * Info interface 1035 */ 1036 1037 static void snd_timer_proc_read(snd_info_entry_t *entry, 1038 snd_info_buffer_t * buffer) 1039 { 1040 unsigned long flags; 1041 snd_timer_t *timer; 1042 snd_timer_instance_t *ti; 1043 struct list_head *p, *q; 1044 1045 down(®ister_mutex); 1046 list_for_each(p, &snd_timer_list) { 1047 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); 1048 switch (timer->tmr_class) { 1049 case SNDRV_TIMER_CLASS_GLOBAL: 1050 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1051 break; 1052 case SNDRV_TIMER_CLASS_CARD: 1053 snd_iprintf(buffer, "C%i-%i: ", timer->card->number, timer->tmr_device); 1054 break; 1055 case SNDRV_TIMER_CLASS_PCM: 1056 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, timer->tmr_device, timer->tmr_subdevice); 1057 break; 1058 default: 1059 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, timer->card ? timer->card->number : -1, timer->tmr_device, timer->tmr_subdevice); 1060 } 1061 snd_iprintf(buffer, "%s :", timer->name); 1062 if (timer->hw.resolution) 1063 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", timer->hw.resolution / 1000, timer->hw.resolution % 1000, timer->hw.ticks); 1064 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1065 snd_iprintf(buffer, " SLAVE"); 1066 snd_iprintf(buffer, "\n"); 1067 spin_lock_irqsave(&timer->lock, flags); 1068 list_for_each(q, &timer->open_list_head) { 1069 ti = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list); 1070 snd_iprintf(buffer, " Client %s : %s : lost interrupts %li\n", 1071 ti->owner ? ti->owner : "unknown", 1072 ti->flags & (SNDRV_TIMER_IFLG_START|SNDRV_TIMER_IFLG_RUNNING) ? "running" : "stopped", 1073 ti->lost); 1074 } 1075 spin_unlock_irqrestore(&timer->lock, flags); 1076 } 1077 up(®ister_mutex); 1078 } 1079 1080 /* 1081 * USER SPACE interface 1082 */ 1083 1084 static void snd_timer_user_interrupt(snd_timer_instance_t *timeri, 1085 unsigned long resolution, 1086 unsigned long ticks) 1087 { 1088 snd_timer_user_t *tu = timeri->callback_data; 1089 snd_timer_read_t *r; 1090 int prev; 1091 1092 spin_lock(&tu->qlock); 1093 if (tu->qused > 0) { 1094 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1095 r = &tu->queue[prev]; 1096 if (r->resolution == resolution) { 1097 r->ticks += ticks; 1098 goto __wake; 1099 } 1100 } 1101 if (tu->qused >= tu->queue_size) { 1102 tu->overrun++; 1103 } else { 1104 r = &tu->queue[tu->qtail++]; 1105 tu->qtail %= tu->queue_size; 1106 r->resolution = resolution; 1107 r->ticks = ticks; 1108 tu->qused++; 1109 } 1110 __wake: 1111 spin_unlock(&tu->qlock); 1112 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1113 wake_up(&tu->qchange_sleep); 1114 } 1115 1116 static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu, snd_timer_tread_t *tread) 1117 { 1118 if (tu->qused >= tu->queue_size) { 1119 tu->overrun++; 1120 } else { 1121 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1122 tu->qtail %= tu->queue_size; 1123 tu->qused++; 1124 } 1125 } 1126 1127 static void snd_timer_user_ccallback(snd_timer_instance_t *timeri, 1128 enum sndrv_timer_event event, 1129 struct timespec *tstamp, 1130 unsigned long resolution) 1131 { 1132 snd_timer_user_t *tu = timeri->callback_data; 1133 snd_timer_tread_t r1; 1134 1135 if (event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE) 1136 tu->tstamp = *tstamp; 1137 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1138 return; 1139 r1.event = event; 1140 r1.tstamp = *tstamp; 1141 r1.val = resolution; 1142 spin_lock(&tu->qlock); 1143 snd_timer_user_append_to_tqueue(tu, &r1); 1144 spin_unlock(&tu->qlock); 1145 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1146 wake_up(&tu->qchange_sleep); 1147 } 1148 1149 static void snd_timer_user_tinterrupt(snd_timer_instance_t *timeri, 1150 unsigned long resolution, 1151 unsigned long ticks) 1152 { 1153 snd_timer_user_t *tu = timeri->callback_data; 1154 snd_timer_tread_t *r, r1; 1155 struct timespec tstamp; 1156 int prev, append = 0; 1157 1158 snd_timestamp_zero(&tstamp); 1159 spin_lock(&tu->qlock); 1160 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION)|(1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1161 spin_unlock(&tu->qlock); 1162 return; 1163 } 1164 if (tu->last_resolution != resolution || ticks > 0) 1165 snd_timestamp_now(&tstamp, 1); 1166 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) { 1167 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1168 r1.tstamp = tstamp; 1169 r1.val = resolution; 1170 snd_timer_user_append_to_tqueue(tu, &r1); 1171 tu->last_resolution = resolution; 1172 append++; 1173 } 1174 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1175 goto __wake; 1176 if (ticks == 0) 1177 goto __wake; 1178 if (tu->qused > 0) { 1179 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1180 r = &tu->tqueue[prev]; 1181 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1182 r->tstamp = tstamp; 1183 r->val += ticks; 1184 append++; 1185 goto __wake; 1186 } 1187 } 1188 r1.event = SNDRV_TIMER_EVENT_TICK; 1189 r1.tstamp = tstamp; 1190 r1.val = ticks; 1191 snd_timer_user_append_to_tqueue(tu, &r1); 1192 append++; 1193 __wake: 1194 spin_unlock(&tu->qlock); 1195 if (append == 0) 1196 return; 1197 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1198 wake_up(&tu->qchange_sleep); 1199 } 1200 1201 static int snd_timer_user_open(struct inode *inode, struct file *file) 1202 { 1203 snd_timer_user_t *tu; 1204 1205 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1206 if (tu == NULL) 1207 return -ENOMEM; 1208 spin_lock_init(&tu->qlock); 1209 init_waitqueue_head(&tu->qchange_sleep); 1210 init_MUTEX(&tu->tread_sem); 1211 tu->ticks = 1; 1212 tu->queue_size = 128; 1213 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); 1214 if (tu->queue == NULL) { 1215 kfree(tu); 1216 return -ENOMEM; 1217 } 1218 file->private_data = tu; 1219 return 0; 1220 } 1221 1222 static int snd_timer_user_release(struct inode *inode, struct file *file) 1223 { 1224 snd_timer_user_t *tu; 1225 1226 if (file->private_data) { 1227 tu = file->private_data; 1228 file->private_data = NULL; 1229 fasync_helper(-1, file, 0, &tu->fasync); 1230 if (tu->timeri) 1231 snd_timer_close(tu->timeri); 1232 kfree(tu->queue); 1233 kfree(tu->tqueue); 1234 kfree(tu); 1235 } 1236 return 0; 1237 } 1238 1239 static void snd_timer_user_zero_id(snd_timer_id_t *id) 1240 { 1241 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1242 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1243 id->card = -1; 1244 id->device = -1; 1245 id->subdevice = -1; 1246 } 1247 1248 static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer) 1249 { 1250 id->dev_class = timer->tmr_class; 1251 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1252 id->card = timer->card ? timer->card->number : -1; 1253 id->device = timer->tmr_device; 1254 id->subdevice = timer->tmr_subdevice; 1255 } 1256 1257 static int snd_timer_user_next_device(snd_timer_id_t __user *_tid) 1258 { 1259 snd_timer_id_t id; 1260 snd_timer_t *timer; 1261 struct list_head *p; 1262 1263 if (copy_from_user(&id, _tid, sizeof(id))) 1264 return -EFAULT; 1265 down(®ister_mutex); 1266 if (id.dev_class < 0) { /* first item */ 1267 if (list_empty(&snd_timer_list)) 1268 snd_timer_user_zero_id(&id); 1269 else { 1270 timer = (snd_timer_t *)list_entry(snd_timer_list.next, snd_timer_t, device_list); 1271 snd_timer_user_copy_id(&id, timer); 1272 } 1273 } else { 1274 switch (id.dev_class) { 1275 case SNDRV_TIMER_CLASS_GLOBAL: 1276 id.device = id.device < 0 ? 0 : id.device + 1; 1277 list_for_each(p, &snd_timer_list) { 1278 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); 1279 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1280 snd_timer_user_copy_id(&id, timer); 1281 break; 1282 } 1283 if (timer->tmr_device >= id.device) { 1284 snd_timer_user_copy_id(&id, timer); 1285 break; 1286 } 1287 } 1288 if (p == &snd_timer_list) 1289 snd_timer_user_zero_id(&id); 1290 break; 1291 case SNDRV_TIMER_CLASS_CARD: 1292 case SNDRV_TIMER_CLASS_PCM: 1293 if (id.card < 0) { 1294 id.card = 0; 1295 } else { 1296 if (id.card < 0) { 1297 id.card = 0; 1298 } else { 1299 if (id.device < 0) { 1300 id.device = 0; 1301 } else { 1302 id.subdevice = id.subdevice < 0 ? 0 : id.subdevice + 1; 1303 } 1304 } 1305 } 1306 list_for_each(p, &snd_timer_list) { 1307 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); 1308 if (timer->tmr_class > id.dev_class) { 1309 snd_timer_user_copy_id(&id, timer); 1310 break; 1311 } 1312 if (timer->tmr_class < id.dev_class) 1313 continue; 1314 if (timer->card->number > id.card) { 1315 snd_timer_user_copy_id(&id, timer); 1316 break; 1317 } 1318 if (timer->card->number < id.card) 1319 continue; 1320 if (timer->tmr_device > id.device) { 1321 snd_timer_user_copy_id(&id, timer); 1322 break; 1323 } 1324 if (timer->tmr_device < id.device) 1325 continue; 1326 if (timer->tmr_subdevice > id.subdevice) { 1327 snd_timer_user_copy_id(&id, timer); 1328 break; 1329 } 1330 if (timer->tmr_subdevice < id.subdevice) 1331 continue; 1332 snd_timer_user_copy_id(&id, timer); 1333 break; 1334 } 1335 if (p == &snd_timer_list) 1336 snd_timer_user_zero_id(&id); 1337 break; 1338 default: 1339 snd_timer_user_zero_id(&id); 1340 } 1341 } 1342 up(®ister_mutex); 1343 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1344 return -EFAULT; 1345 return 0; 1346 } 1347 1348 static int snd_timer_user_ginfo(struct file *file, snd_timer_ginfo_t __user *_ginfo) 1349 { 1350 snd_timer_ginfo_t *ginfo; 1351 snd_timer_id_t tid; 1352 snd_timer_t *t; 1353 struct list_head *p; 1354 int err = 0; 1355 1356 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL); 1357 if (! ginfo) 1358 return -ENOMEM; 1359 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) { 1360 kfree(ginfo); 1361 return -EFAULT; 1362 } 1363 tid = ginfo->tid; 1364 memset(ginfo, 0, sizeof(*ginfo)); 1365 ginfo->tid = tid; 1366 down(®ister_mutex); 1367 t = snd_timer_find(&tid); 1368 if (t != NULL) { 1369 ginfo->card = t->card ? t->card->number : -1; 1370 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1371 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1372 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1373 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1374 ginfo->resolution = t->hw.resolution; 1375 if (t->hw.resolution_min > 0) { 1376 ginfo->resolution_min = t->hw.resolution_min; 1377 ginfo->resolution_max = t->hw.resolution_max; 1378 } 1379 list_for_each(p, &t->open_list_head) { 1380 ginfo->clients++; 1381 } 1382 } else { 1383 err = -ENODEV; 1384 } 1385 up(®ister_mutex); 1386 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1387 err = -EFAULT; 1388 kfree(ginfo); 1389 return err; 1390 } 1391 1392 static int snd_timer_user_gparams(struct file *file, snd_timer_gparams_t __user *_gparams) 1393 { 1394 snd_timer_gparams_t gparams; 1395 snd_timer_t *t; 1396 int err; 1397 1398 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1399 return -EFAULT; 1400 down(®ister_mutex); 1401 t = snd_timer_find(&gparams.tid); 1402 if (t != NULL) { 1403 if (list_empty(&t->open_list_head)) { 1404 if (t->hw.set_period) 1405 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1406 else 1407 err = -ENOSYS; 1408 } else { 1409 err = -EBUSY; 1410 } 1411 } else { 1412 err = -ENODEV; 1413 } 1414 up(®ister_mutex); 1415 return err; 1416 } 1417 1418 static int snd_timer_user_gstatus(struct file *file, snd_timer_gstatus_t __user *_gstatus) 1419 { 1420 snd_timer_gstatus_t gstatus; 1421 snd_timer_id_t tid; 1422 snd_timer_t *t; 1423 int err = 0; 1424 1425 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1426 return -EFAULT; 1427 tid = gstatus.tid; 1428 memset(&gstatus, 0, sizeof(gstatus)); 1429 gstatus.tid = tid; 1430 down(®ister_mutex); 1431 t = snd_timer_find(&tid); 1432 if (t != NULL) { 1433 if (t->hw.c_resolution) 1434 gstatus.resolution = t->hw.c_resolution(t); 1435 else 1436 gstatus.resolution = t->hw.resolution; 1437 if (t->hw.precise_resolution) { 1438 t->hw.precise_resolution(t, &gstatus.resolution_num, &gstatus.resolution_den); 1439 } else { 1440 gstatus.resolution_num = gstatus.resolution; 1441 gstatus.resolution_den = 1000000000uL; 1442 } 1443 } else { 1444 err = -ENODEV; 1445 } 1446 up(®ister_mutex); 1447 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1448 err = -EFAULT; 1449 return err; 1450 } 1451 1452 static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *_tselect) 1453 { 1454 snd_timer_user_t *tu; 1455 snd_timer_select_t tselect; 1456 char str[32]; 1457 int err = 0; 1458 1459 tu = file->private_data; 1460 down(&tu->tread_sem); 1461 if (tu->timeri) { 1462 snd_timer_close(tu->timeri); 1463 tu->timeri = NULL; 1464 } 1465 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1466 err = -EFAULT; 1467 goto __err; 1468 } 1469 sprintf(str, "application %i", current->pid); 1470 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1471 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1472 if ((err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid)) < 0) 1473 goto __err; 1474 1475 kfree(tu->queue); 1476 tu->queue = NULL; 1477 kfree(tu->tqueue); 1478 tu->tqueue = NULL; 1479 if (tu->tread) { 1480 tu->tqueue = (snd_timer_tread_t *)kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL); 1481 if (tu->tqueue == NULL) 1482 err = -ENOMEM; 1483 } else { 1484 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); 1485 if (tu->queue == NULL) 1486 err = -ENOMEM; 1487 } 1488 1489 if (err < 0) { 1490 snd_timer_close(tu->timeri); 1491 tu->timeri = NULL; 1492 } else { 1493 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1494 tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1495 tu->timeri->ccallback = snd_timer_user_ccallback; 1496 tu->timeri->callback_data = (void *)tu; 1497 } 1498 1499 __err: 1500 up(&tu->tread_sem); 1501 return err; 1502 } 1503 1504 static int snd_timer_user_info(struct file *file, snd_timer_info_t __user *_info) 1505 { 1506 snd_timer_user_t *tu; 1507 snd_timer_info_t *info; 1508 snd_timer_t *t; 1509 int err = 0; 1510 1511 tu = file->private_data; 1512 snd_assert(tu->timeri != NULL, return -ENXIO); 1513 t = tu->timeri->timer; 1514 snd_assert(t != NULL, return -ENXIO); 1515 1516 info = kzalloc(sizeof(*info), GFP_KERNEL); 1517 if (! info) 1518 return -ENOMEM; 1519 info->card = t->card ? t->card->number : -1; 1520 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1521 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1522 strlcpy(info->id, t->id, sizeof(info->id)); 1523 strlcpy(info->name, t->name, sizeof(info->name)); 1524 info->resolution = t->hw.resolution; 1525 if (copy_to_user(_info, info, sizeof(*_info))) 1526 err = -EFAULT; 1527 kfree(info); 1528 return err; 1529 } 1530 1531 static int snd_timer_user_params(struct file *file, snd_timer_params_t __user *_params) 1532 { 1533 snd_timer_user_t *tu; 1534 snd_timer_params_t params; 1535 snd_timer_t *t; 1536 snd_timer_read_t *tr; 1537 snd_timer_tread_t *ttr; 1538 int err; 1539 1540 tu = file->private_data; 1541 snd_assert(tu->timeri != NULL, return -ENXIO); 1542 t = tu->timeri->timer; 1543 snd_assert(t != NULL, return -ENXIO); 1544 if (copy_from_user(¶ms, _params, sizeof(params))) 1545 return -EFAULT; 1546 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1547 err = -EINVAL; 1548 goto _end; 1549 } 1550 if (params.queue_size > 0 && (params.queue_size < 32 || params.queue_size > 1024)) { 1551 err = -EINVAL; 1552 goto _end; 1553 } 1554 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1555 (1<<SNDRV_TIMER_EVENT_TICK)| 1556 (1<<SNDRV_TIMER_EVENT_START)| 1557 (1<<SNDRV_TIMER_EVENT_STOP)| 1558 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1559 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1560 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1561 (1<<SNDRV_TIMER_EVENT_RESUME)| 1562 (1<<SNDRV_TIMER_EVENT_MSTART)| 1563 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1564 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1565 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1566 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1567 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1568 err = -EINVAL; 1569 goto _end; 1570 } 1571 snd_timer_stop(tu->timeri); 1572 spin_lock_irq(&t->lock); 1573 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1574 SNDRV_TIMER_IFLG_EXCLUSIVE| 1575 SNDRV_TIMER_IFLG_EARLY_EVENT); 1576 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1577 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1578 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1579 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1580 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1581 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1582 spin_unlock_irq(&t->lock); 1583 if (params.queue_size > 0 && (unsigned int)tu->queue_size != params.queue_size) { 1584 if (tu->tread) { 1585 ttr = (snd_timer_tread_t *)kmalloc(params.queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL); 1586 if (ttr) { 1587 kfree(tu->tqueue); 1588 tu->queue_size = params.queue_size; 1589 tu->tqueue = ttr; 1590 } 1591 } else { 1592 tr = (snd_timer_read_t *)kmalloc(params.queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); 1593 if (tr) { 1594 kfree(tu->queue); 1595 tu->queue_size = params.queue_size; 1596 tu->queue = tr; 1597 } 1598 } 1599 } 1600 tu->qhead = tu->qtail = tu->qused = 0; 1601 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1602 if (tu->tread) { 1603 snd_timer_tread_t tread; 1604 tread.event = SNDRV_TIMER_EVENT_EARLY; 1605 tread.tstamp.tv_sec = 0; 1606 tread.tstamp.tv_nsec = 0; 1607 tread.val = 0; 1608 snd_timer_user_append_to_tqueue(tu, &tread); 1609 } else { 1610 snd_timer_read_t *r = &tu->queue[0]; 1611 r->resolution = 0; 1612 r->ticks = 0; 1613 tu->qused++; 1614 tu->qtail++; 1615 } 1616 1617 } 1618 tu->filter = params.filter; 1619 tu->ticks = params.ticks; 1620 err = 0; 1621 _end: 1622 if (copy_to_user(_params, ¶ms, sizeof(params))) 1623 return -EFAULT; 1624 return err; 1625 } 1626 1627 static int snd_timer_user_status(struct file *file, snd_timer_status_t __user *_status) 1628 { 1629 snd_timer_user_t *tu; 1630 snd_timer_status_t status; 1631 1632 tu = file->private_data; 1633 snd_assert(tu->timeri != NULL, return -ENXIO); 1634 memset(&status, 0, sizeof(status)); 1635 status.tstamp = tu->tstamp; 1636 status.resolution = snd_timer_resolution(tu->timeri); 1637 status.lost = tu->timeri->lost; 1638 status.overrun = tu->overrun; 1639 spin_lock_irq(&tu->qlock); 1640 status.queue = tu->qused; 1641 spin_unlock_irq(&tu->qlock); 1642 if (copy_to_user(_status, &status, sizeof(status))) 1643 return -EFAULT; 1644 return 0; 1645 } 1646 1647 static int snd_timer_user_start(struct file *file) 1648 { 1649 int err; 1650 snd_timer_user_t *tu; 1651 1652 tu = file->private_data; 1653 snd_assert(tu->timeri != NULL, return -ENXIO); 1654 snd_timer_stop(tu->timeri); 1655 tu->timeri->lost = 0; 1656 tu->last_resolution = 0; 1657 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1658 } 1659 1660 static int snd_timer_user_stop(struct file *file) 1661 { 1662 int err; 1663 snd_timer_user_t *tu; 1664 1665 tu = file->private_data; 1666 snd_assert(tu->timeri != NULL, return -ENXIO); 1667 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1668 } 1669 1670 static int snd_timer_user_continue(struct file *file) 1671 { 1672 int err; 1673 snd_timer_user_t *tu; 1674 1675 tu = file->private_data; 1676 snd_assert(tu->timeri != NULL, return -ENXIO); 1677 tu->timeri->lost = 0; 1678 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1679 } 1680 1681 static int snd_timer_user_pause(struct file *file) 1682 { 1683 int err; 1684 snd_timer_user_t *tu; 1685 1686 tu = file->private_data; 1687 snd_assert(tu->timeri != NULL, return -ENXIO); 1688 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1689 } 1690 1691 enum { 1692 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1693 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1694 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1695 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1696 }; 1697 1698 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1699 { 1700 snd_timer_user_t *tu; 1701 void __user *argp = (void __user *)arg; 1702 int __user *p = argp; 1703 1704 tu = file->private_data; 1705 switch (cmd) { 1706 case SNDRV_TIMER_IOCTL_PVERSION: 1707 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1708 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1709 return snd_timer_user_next_device(argp); 1710 case SNDRV_TIMER_IOCTL_TREAD: 1711 { 1712 int xarg; 1713 1714 down(&tu->tread_sem); 1715 if (tu->timeri) { /* too late */ 1716 up(&tu->tread_sem); 1717 return -EBUSY; 1718 } 1719 if (get_user(xarg, p)) { 1720 up(&tu->tread_sem); 1721 return -EFAULT; 1722 } 1723 tu->tread = xarg ? 1 : 0; 1724 up(&tu->tread_sem); 1725 return 0; 1726 } 1727 case SNDRV_TIMER_IOCTL_GINFO: 1728 return snd_timer_user_ginfo(file, argp); 1729 case SNDRV_TIMER_IOCTL_GPARAMS: 1730 return snd_timer_user_gparams(file, argp); 1731 case SNDRV_TIMER_IOCTL_GSTATUS: 1732 return snd_timer_user_gstatus(file, argp); 1733 case SNDRV_TIMER_IOCTL_SELECT: 1734 return snd_timer_user_tselect(file, argp); 1735 case SNDRV_TIMER_IOCTL_INFO: 1736 return snd_timer_user_info(file, argp); 1737 case SNDRV_TIMER_IOCTL_PARAMS: 1738 return snd_timer_user_params(file, argp); 1739 case SNDRV_TIMER_IOCTL_STATUS: 1740 return snd_timer_user_status(file, argp); 1741 case SNDRV_TIMER_IOCTL_START: 1742 case SNDRV_TIMER_IOCTL_START_OLD: 1743 return snd_timer_user_start(file); 1744 case SNDRV_TIMER_IOCTL_STOP: 1745 case SNDRV_TIMER_IOCTL_STOP_OLD: 1746 return snd_timer_user_stop(file); 1747 case SNDRV_TIMER_IOCTL_CONTINUE: 1748 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1749 return snd_timer_user_continue(file); 1750 case SNDRV_TIMER_IOCTL_PAUSE: 1751 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1752 return snd_timer_user_pause(file); 1753 } 1754 return -ENOTTY; 1755 } 1756 1757 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1758 { 1759 snd_timer_user_t *tu; 1760 int err; 1761 1762 tu = file->private_data; 1763 err = fasync_helper(fd, file, on, &tu->fasync); 1764 if (err < 0) 1765 return err; 1766 return 0; 1767 } 1768 1769 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset) 1770 { 1771 snd_timer_user_t *tu; 1772 long result = 0, unit; 1773 int err = 0; 1774 1775 tu = file->private_data; 1776 unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t); 1777 spin_lock_irq(&tu->qlock); 1778 while ((long)count - result >= unit) { 1779 while (!tu->qused) { 1780 wait_queue_t wait; 1781 1782 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1783 err = -EAGAIN; 1784 break; 1785 } 1786 1787 set_current_state(TASK_INTERRUPTIBLE); 1788 init_waitqueue_entry(&wait, current); 1789 add_wait_queue(&tu->qchange_sleep, &wait); 1790 1791 spin_unlock_irq(&tu->qlock); 1792 schedule(); 1793 spin_lock_irq(&tu->qlock); 1794 1795 remove_wait_queue(&tu->qchange_sleep, &wait); 1796 1797 if (signal_pending(current)) { 1798 err = -ERESTARTSYS; 1799 break; 1800 } 1801 } 1802 1803 spin_unlock_irq(&tu->qlock); 1804 if (err < 0) 1805 goto _error; 1806 1807 if (tu->tread) { 1808 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], sizeof(snd_timer_tread_t))) { 1809 err = -EFAULT; 1810 goto _error; 1811 } 1812 } else { 1813 if (copy_to_user(buffer, &tu->queue[tu->qhead++], sizeof(snd_timer_read_t))) { 1814 err = -EFAULT; 1815 goto _error; 1816 } 1817 } 1818 1819 tu->qhead %= tu->queue_size; 1820 1821 result += unit; 1822 buffer += unit; 1823 1824 spin_lock_irq(&tu->qlock); 1825 tu->qused--; 1826 } 1827 spin_unlock_irq(&tu->qlock); 1828 _error: 1829 return result > 0 ? result : err; 1830 } 1831 1832 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1833 { 1834 unsigned int mask; 1835 snd_timer_user_t *tu; 1836 1837 tu = file->private_data; 1838 1839 poll_wait(file, &tu->qchange_sleep, wait); 1840 1841 mask = 0; 1842 if (tu->qused) 1843 mask |= POLLIN | POLLRDNORM; 1844 1845 return mask; 1846 } 1847 1848 #ifdef CONFIG_COMPAT 1849 #include "timer_compat.c" 1850 #else 1851 #define snd_timer_user_ioctl_compat NULL 1852 #endif 1853 1854 static struct file_operations snd_timer_f_ops = 1855 { 1856 .owner = THIS_MODULE, 1857 .read = snd_timer_user_read, 1858 .open = snd_timer_user_open, 1859 .release = snd_timer_user_release, 1860 .poll = snd_timer_user_poll, 1861 .unlocked_ioctl = snd_timer_user_ioctl, 1862 .compat_ioctl = snd_timer_user_ioctl_compat, 1863 .fasync = snd_timer_user_fasync, 1864 }; 1865 1866 static snd_minor_t snd_timer_reg = 1867 { 1868 .comment = "timer", 1869 .f_ops = &snd_timer_f_ops, 1870 }; 1871 1872 /* 1873 * ENTRY functions 1874 */ 1875 1876 static snd_info_entry_t *snd_timer_proc_entry = NULL; 1877 1878 static int __init alsa_timer_init(void) 1879 { 1880 int err; 1881 snd_info_entry_t *entry; 1882 1883 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1884 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, "system timer"); 1885 #endif 1886 if ((entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL)) != NULL) { 1887 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128; 1888 entry->c.text.read = snd_timer_proc_read; 1889 if (snd_info_register(entry) < 0) { 1890 snd_info_free_entry(entry); 1891 entry = NULL; 1892 } 1893 } 1894 snd_timer_proc_entry = entry; 1895 if ((err = snd_timer_register_system()) < 0) 1896 snd_printk(KERN_ERR "unable to register system timer (%i)\n", err); 1897 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, 1898 NULL, 0, &snd_timer_reg, "timer"))<0) 1899 snd_printk(KERN_ERR "unable to register timer device (%i)\n", err); 1900 return 0; 1901 } 1902 1903 static void __exit alsa_timer_exit(void) 1904 { 1905 struct list_head *p, *n; 1906 1907 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 1908 /* unregister the system timer */ 1909 list_for_each_safe(p, n, &snd_timer_list) { 1910 snd_timer_t *timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); 1911 snd_timer_unregister(timer); 1912 } 1913 if (snd_timer_proc_entry) { 1914 snd_info_unregister(snd_timer_proc_entry); 1915 snd_timer_proc_entry = NULL; 1916 } 1917 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1918 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1919 #endif 1920 } 1921 1922 module_init(alsa_timer_init) 1923 module_exit(alsa_timer_exit) 1924 1925 EXPORT_SYMBOL(snd_timer_open); 1926 EXPORT_SYMBOL(snd_timer_close); 1927 EXPORT_SYMBOL(snd_timer_resolution); 1928 EXPORT_SYMBOL(snd_timer_start); 1929 EXPORT_SYMBOL(snd_timer_stop); 1930 EXPORT_SYMBOL(snd_timer_continue); 1931 EXPORT_SYMBOL(snd_timer_pause); 1932 EXPORT_SYMBOL(snd_timer_new); 1933 EXPORT_SYMBOL(snd_timer_notify); 1934 EXPORT_SYMBOL(snd_timer_global_new); 1935 EXPORT_SYMBOL(snd_timer_global_free); 1936 EXPORT_SYMBOL(snd_timer_global_register); 1937 EXPORT_SYMBOL(snd_timer_global_unregister); 1938 EXPORT_SYMBOL(snd_timer_interrupt); 1939