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, 99 snd_timer_t *timer) 100 { 101 snd_timer_instance_t *timeri; 102 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 103 if (timeri == NULL) 104 return NULL; 105 timeri->owner = kstrdup(owner, GFP_KERNEL); 106 if (! timeri->owner) { 107 kfree(timeri); 108 return NULL; 109 } 110 INIT_LIST_HEAD(&timeri->open_list); 111 INIT_LIST_HEAD(&timeri->active_list); 112 INIT_LIST_HEAD(&timeri->ack_list); 113 INIT_LIST_HEAD(&timeri->slave_list_head); 114 INIT_LIST_HEAD(&timeri->slave_active_head); 115 116 timeri->timer = timer; 117 if (timer && !try_module_get(timer->module)) { 118 kfree(timeri->owner); 119 kfree(timeri); 120 return NULL; 121 } 122 123 return timeri; 124 } 125 126 /* 127 * find a timer instance from the given timer id 128 */ 129 static snd_timer_t *snd_timer_find(snd_timer_id_t *tid) 130 { 131 snd_timer_t *timer = NULL; 132 struct list_head *p; 133 134 list_for_each(p, &snd_timer_list) { 135 timer = list_entry(p, snd_timer_t, device_list); 136 137 if (timer->tmr_class != tid->dev_class) 138 continue; 139 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 140 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 141 (timer->card == NULL || 142 timer->card->number != tid->card)) 143 continue; 144 if (timer->tmr_device != tid->device) 145 continue; 146 if (timer->tmr_subdevice != tid->subdevice) 147 continue; 148 return timer; 149 } 150 return NULL; 151 } 152 153 #ifdef CONFIG_KMOD 154 155 static void snd_timer_request(snd_timer_id_t *tid) 156 { 157 if (! current->fs->root) 158 return; 159 switch (tid->dev_class) { 160 case SNDRV_TIMER_CLASS_GLOBAL: 161 if (tid->device < timer_limit) 162 request_module("snd-timer-%i", tid->device); 163 break; 164 case SNDRV_TIMER_CLASS_CARD: 165 case SNDRV_TIMER_CLASS_PCM: 166 if (tid->card < snd_ecards_limit) 167 request_module("snd-card-%i", tid->card); 168 break; 169 default: 170 break; 171 } 172 } 173 174 #endif 175 176 /* 177 * look for a master instance matching with the slave id of the given slave. 178 * when found, relink the open_link of the slave. 179 * 180 * call this with register_mutex down. 181 */ 182 static void snd_timer_check_slave(snd_timer_instance_t *slave) 183 { 184 snd_timer_t *timer; 185 snd_timer_instance_t *master; 186 struct list_head *p, *q; 187 188 /* FIXME: it's really dumb to look up all entries.. */ 189 list_for_each(p, &snd_timer_list) { 190 timer = list_entry(p, snd_timer_t, device_list); 191 list_for_each(q, &timer->open_list_head) { 192 master = list_entry(q, snd_timer_instance_t, open_list); 193 if (slave->slave_class == master->slave_class && 194 slave->slave_id == master->slave_id) { 195 list_del(&slave->open_list); 196 list_add_tail(&slave->open_list, 197 &master->slave_list_head); 198 spin_lock_irq(&slave_active_lock); 199 slave->master = master; 200 slave->timer = master->timer; 201 spin_unlock_irq(&slave_active_lock); 202 return; 203 } 204 } 205 } 206 } 207 208 /* 209 * look for slave instances matching with the slave id of the given master. 210 * when found, relink the open_link of slaves. 211 * 212 * call this with register_mutex down. 213 */ 214 static void snd_timer_check_master(snd_timer_instance_t *master) 215 { 216 snd_timer_instance_t *slave; 217 struct list_head *p, *n; 218 219 /* check all pending slaves */ 220 list_for_each_safe(p, n, &snd_timer_slave_list) { 221 slave = list_entry(p, snd_timer_instance_t, open_list); 222 if (slave->slave_class == master->slave_class && 223 slave->slave_id == master->slave_id) { 224 list_del(p); 225 list_add_tail(p, &master->slave_list_head); 226 spin_lock_irq(&slave_active_lock); 227 slave->master = master; 228 slave->timer = master->timer; 229 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 230 list_add_tail(&slave->active_list, 231 &master->slave_active_head); 232 spin_unlock_irq(&slave_active_lock); 233 } 234 } 235 } 236 237 /* 238 * open a timer instance 239 * when opening a master, the slave id must be here given. 240 */ 241 int snd_timer_open(snd_timer_instance_t **ti, 242 char *owner, snd_timer_id_t *tid, 243 unsigned int slave_id) 244 { 245 snd_timer_t *timer; 246 snd_timer_instance_t *timeri = NULL; 247 248 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 249 /* open a slave instance */ 250 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 251 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 252 snd_printd("invalid slave class %i\n", tid->dev_sclass); 253 return -EINVAL; 254 } 255 down(®ister_mutex); 256 timeri = snd_timer_instance_new(owner, NULL); 257 if (!timeri) { 258 up(®ister_mutex); 259 return -ENOMEM; 260 } 261 timeri->slave_class = tid->dev_sclass; 262 timeri->slave_id = tid->device; 263 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 264 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 265 snd_timer_check_slave(timeri); 266 up(®ister_mutex); 267 *ti = timeri; 268 return 0; 269 } 270 271 /* open a master instance */ 272 down(®ister_mutex); 273 timer = snd_timer_find(tid); 274 #ifdef CONFIG_KMOD 275 if (timer == NULL) { 276 up(®ister_mutex); 277 snd_timer_request(tid); 278 down(®ister_mutex); 279 timer = snd_timer_find(tid); 280 } 281 #endif 282 if (!timer) { 283 up(®ister_mutex); 284 return -ENODEV; 285 } 286 if (!list_empty(&timer->open_list_head)) { 287 timeri = list_entry(timer->open_list_head.next, 288 snd_timer_instance_t, open_list); 289 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 290 up(®ister_mutex); 291 return -EBUSY; 292 } 293 } 294 timeri = snd_timer_instance_new(owner, timer); 295 if (!timeri) { 296 up(®ister_mutex); 297 return -ENOMEM; 298 } 299 timeri->slave_class = tid->dev_sclass; 300 timeri->slave_id = slave_id; 301 if (list_empty(&timer->open_list_head) && timer->hw.open) 302 timer->hw.open(timer); 303 list_add_tail(&timeri->open_list, &timer->open_list_head); 304 snd_timer_check_master(timeri); 305 up(®ister_mutex); 306 *ti = timeri; 307 return 0; 308 } 309 310 static int _snd_timer_stop(snd_timer_instance_t * timeri, 311 int keep_flag, enum sndrv_timer_event event); 312 313 /* 314 * close a timer instance 315 */ 316 int snd_timer_close(snd_timer_instance_t * timeri) 317 { 318 snd_timer_t *timer = NULL; 319 struct list_head *p, *n; 320 snd_timer_instance_t *slave; 321 322 snd_assert(timeri != NULL, return -ENXIO); 323 324 /* force to stop the timer */ 325 snd_timer_stop(timeri); 326 327 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 328 /* wait, until the active callback is finished */ 329 spin_lock_irq(&slave_active_lock); 330 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 331 spin_unlock_irq(&slave_active_lock); 332 udelay(10); 333 spin_lock_irq(&slave_active_lock); 334 } 335 spin_unlock_irq(&slave_active_lock); 336 down(®ister_mutex); 337 list_del(&timeri->open_list); 338 up(®ister_mutex); 339 } else { 340 timer = timeri->timer; 341 /* wait, until the active callback is finished */ 342 spin_lock_irq(&timer->lock); 343 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 344 spin_unlock_irq(&timer->lock); 345 udelay(10); 346 spin_lock_irq(&timer->lock); 347 } 348 spin_unlock_irq(&timer->lock); 349 down(®ister_mutex); 350 list_del(&timeri->open_list); 351 if (timer && list_empty(&timer->open_list_head) && 352 timer->hw.close) 353 timer->hw.close(timer); 354 /* remove slave links */ 355 list_for_each_safe(p, n, &timeri->slave_list_head) { 356 slave = list_entry(p, snd_timer_instance_t, open_list); 357 spin_lock_irq(&slave_active_lock); 358 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); 359 list_del(p); 360 list_add_tail(p, &snd_timer_slave_list); 361 slave->master = NULL; 362 slave->timer = NULL; 363 spin_unlock_irq(&slave_active_lock); 364 } 365 up(®ister_mutex); 366 } 367 if (timeri->private_free) 368 timeri->private_free(timeri); 369 kfree(timeri->owner); 370 kfree(timeri); 371 if (timer) 372 module_put(timer->module); 373 return 0; 374 } 375 376 unsigned long snd_timer_resolution(snd_timer_instance_t * timeri) 377 { 378 snd_timer_t * timer; 379 380 if (timeri == NULL) 381 return 0; 382 if ((timer = timeri->timer) != NULL) { 383 if (timer->hw.c_resolution) 384 return timer->hw.c_resolution(timer); 385 return timer->hw.resolution; 386 } 387 return 0; 388 } 389 390 static void snd_timer_notify1(snd_timer_instance_t *ti, 391 enum sndrv_timer_event event) 392 { 393 snd_timer_t *timer; 394 unsigned long flags; 395 unsigned long resolution = 0; 396 snd_timer_instance_t *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, snd_timer_instance_t, 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(snd_timer_t *timer, snd_timer_instance_t *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(snd_timer_instance_t *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(snd_timer_instance_t * timeri, unsigned int ticks) 462 { 463 snd_timer_t *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(snd_timer_instance_t * timeri, 487 int keep_flag, enum sndrv_timer_event event) 488 { 489 snd_timer_t *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(snd_timer_instance_t * timeri) 536 { 537 snd_timer_t *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(snd_timer_instance_t * timeri) 556 { 557 snd_timer_t *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(snd_timer_instance_t * 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(snd_timer_t * timer, unsigned long ticks_left) 593 { 594 snd_timer_instance_t *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, snd_timer_instance_t, 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 snd_timer_t *timer = (snd_timer_t *) arg; 628 snd_timer_instance_t *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, snd_timer_instance_t, 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(snd_timer_t * timer, unsigned long ticks_left) 662 { 663 snd_timer_instance_t *ti, *ts; 664 unsigned long resolution, ticks; 665 struct list_head *p, *q, *n, *ack_list_head; 666 int use_tasklet = 0; 667 668 if (timer == NULL) 669 return; 670 671 spin_lock(&timer->lock); 672 673 /* remember the current resolution */ 674 if (timer->hw.c_resolution) 675 resolution = timer->hw.c_resolution(timer); 676 else 677 resolution = timer->hw.resolution; 678 679 /* loop for all active instances 680 * Here we cannot use list_for_each because the active_list of a 681 * processed instance is relinked to done_list_head before the callback 682 * is called. 683 */ 684 list_for_each_safe(p, n, &timer->active_list_head) { 685 ti = list_entry(p, snd_timer_instance_t, active_list); 686 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 687 continue; 688 ti->pticks += ticks_left; 689 ti->resolution = resolution; 690 if (ti->cticks < ticks_left) 691 ti->cticks = 0; 692 else 693 ti->cticks -= ticks_left; 694 if (ti->cticks) /* not expired */ 695 continue; 696 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 697 ti->cticks = ti->ticks; 698 } else { 699 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 700 if (--timer->running) 701 list_del(p); 702 } 703 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 704 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 705 ack_list_head = &timer->ack_list_head; 706 else 707 ack_list_head = &timer->sack_list_head; 708 if (list_empty(&ti->ack_list)) 709 list_add_tail(&ti->ack_list, ack_list_head); 710 list_for_each(q, &ti->slave_active_head) { 711 ts = list_entry(q, snd_timer_instance_t, active_list); 712 ts->pticks = ti->pticks; 713 ts->resolution = resolution; 714 if (list_empty(&ts->ack_list)) 715 list_add_tail(&ts->ack_list, ack_list_head); 716 } 717 } 718 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 719 snd_timer_reschedule(timer, ticks_left); 720 if (timer->running) { 721 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 722 timer->hw.stop(timer); 723 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 724 } 725 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 726 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 727 /* restart timer */ 728 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 729 timer->hw.start(timer); 730 } 731 } else { 732 timer->hw.stop(timer); 733 } 734 735 /* now process all fast callbacks */ 736 while (!list_empty(&timer->ack_list_head)) { 737 p = timer->ack_list_head.next; /* get first item */ 738 ti = list_entry(p, snd_timer_instance_t, ack_list); 739 740 /* remove from ack_list and make empty */ 741 list_del_init(p); 742 743 ticks = ti->pticks; 744 ti->pticks = 0; 745 746 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 747 spin_unlock(&timer->lock); 748 if (ti->callback) 749 ti->callback(ti, resolution, ticks); 750 spin_lock(&timer->lock); 751 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 752 } 753 754 /* do we have any slow callbacks? */ 755 use_tasklet = !list_empty(&timer->sack_list_head); 756 spin_unlock(&timer->lock); 757 758 if (use_tasklet) 759 tasklet_hi_schedule(&timer->task_queue); 760 } 761 762 /* 763 764 */ 765 766 int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, 767 snd_timer_t **rtimer) 768 { 769 snd_timer_t *timer; 770 int err; 771 static snd_device_ops_t ops = { 772 .dev_free = snd_timer_dev_free, 773 .dev_register = snd_timer_dev_register, 774 .dev_unregister = snd_timer_dev_unregister 775 }; 776 777 snd_assert(tid != NULL, return -EINVAL); 778 snd_assert(rtimer != NULL, return -EINVAL); 779 *rtimer = NULL; 780 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 781 if (timer == NULL) 782 return -ENOMEM; 783 timer->tmr_class = tid->dev_class; 784 timer->card = card; 785 timer->tmr_device = tid->device; 786 timer->tmr_subdevice = tid->subdevice; 787 if (id) 788 strlcpy(timer->id, id, sizeof(timer->id)); 789 INIT_LIST_HEAD(&timer->device_list); 790 INIT_LIST_HEAD(&timer->open_list_head); 791 INIT_LIST_HEAD(&timer->active_list_head); 792 INIT_LIST_HEAD(&timer->ack_list_head); 793 INIT_LIST_HEAD(&timer->sack_list_head); 794 spin_lock_init(&timer->lock); 795 tasklet_init(&timer->task_queue, snd_timer_tasklet, 796 (unsigned long)timer); 797 if (card != NULL) { 798 timer->module = card->module; 799 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 800 if (err < 0) { 801 snd_timer_free(timer); 802 return err; 803 } 804 } 805 *rtimer = timer; 806 return 0; 807 } 808 809 static int snd_timer_free(snd_timer_t *timer) 810 { 811 snd_assert(timer != NULL, return -ENXIO); 812 if (timer->private_free) 813 timer->private_free(timer); 814 kfree(timer); 815 return 0; 816 } 817 818 static int snd_timer_dev_free(snd_device_t *device) 819 { 820 snd_timer_t *timer = device->device_data; 821 return snd_timer_free(timer); 822 } 823 824 static int snd_timer_dev_register(snd_device_t *dev) 825 { 826 snd_timer_t *timer = dev->device_data; 827 snd_timer_t *timer1; 828 struct list_head *p; 829 830 snd_assert(timer != NULL && timer->hw.start != NULL && 831 timer->hw.stop != NULL, return -ENXIO); 832 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 833 !timer->hw.resolution && timer->hw.c_resolution == NULL) 834 return -EINVAL; 835 836 down(®ister_mutex); 837 list_for_each(p, &snd_timer_list) { 838 timer1 = list_entry(p, snd_timer_t, device_list); 839 if (timer1->tmr_class > timer->tmr_class) 840 break; 841 if (timer1->tmr_class < timer->tmr_class) 842 continue; 843 if (timer1->card && timer->card) { 844 if (timer1->card->number > timer->card->number) 845 break; 846 if (timer1->card->number < timer->card->number) 847 continue; 848 } 849 if (timer1->tmr_device > timer->tmr_device) 850 break; 851 if (timer1->tmr_device < timer->tmr_device) 852 continue; 853 if (timer1->tmr_subdevice > timer->tmr_subdevice) 854 break; 855 if (timer1->tmr_subdevice < timer->tmr_subdevice) 856 continue; 857 /* conflicts.. */ 858 up(®ister_mutex); 859 return -EBUSY; 860 } 861 list_add_tail(&timer->device_list, p); 862 up(®ister_mutex); 863 return 0; 864 } 865 866 static int snd_timer_unregister(snd_timer_t *timer) 867 { 868 struct list_head *p, *n; 869 snd_timer_instance_t *ti; 870 871 snd_assert(timer != NULL, return -ENXIO); 872 down(®ister_mutex); 873 if (! list_empty(&timer->open_list_head)) { 874 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer); 875 list_for_each_safe(p, n, &timer->open_list_head) { 876 list_del_init(p); 877 ti = list_entry(p, snd_timer_instance_t, open_list); 878 ti->timer = NULL; 879 } 880 } 881 list_del(&timer->device_list); 882 up(®ister_mutex); 883 return snd_timer_free(timer); 884 } 885 886 static int snd_timer_dev_unregister(snd_device_t *device) 887 { 888 snd_timer_t *timer = device->device_data; 889 return snd_timer_unregister(timer); 890 } 891 892 void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, 893 struct timespec *tstamp) 894 { 895 unsigned long flags; 896 unsigned long resolution = 0; 897 snd_timer_instance_t *ti, *ts; 898 struct list_head *p, *n; 899 900 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 901 return; 902 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && 903 event <= SNDRV_TIMER_EVENT_MRESUME, return); 904 spin_lock_irqsave(&timer->lock, flags); 905 if (event == SNDRV_TIMER_EVENT_MSTART || 906 event == SNDRV_TIMER_EVENT_MCONTINUE || 907 event == SNDRV_TIMER_EVENT_MRESUME) { 908 if (timer->hw.c_resolution) 909 resolution = timer->hw.c_resolution(timer); 910 else 911 resolution = timer->hw.resolution; 912 } 913 list_for_each(p, &timer->active_list_head) { 914 ti = list_entry(p, snd_timer_instance_t, active_list); 915 if (ti->ccallback) 916 ti->ccallback(ti, event, tstamp, resolution); 917 list_for_each(n, &ti->slave_active_head) { 918 ts = list_entry(n, snd_timer_instance_t, active_list); 919 if (ts->ccallback) 920 ts->ccallback(ts, event, tstamp, resolution); 921 } 922 } 923 spin_unlock_irqrestore(&timer->lock, flags); 924 } 925 926 /* 927 * exported functions for global timers 928 */ 929 int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer) 930 { 931 snd_timer_id_t tid; 932 933 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 934 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 935 tid.card = -1; 936 tid.device = device; 937 tid.subdevice = 0; 938 return snd_timer_new(NULL, id, &tid, rtimer); 939 } 940 941 int snd_timer_global_free(snd_timer_t *timer) 942 { 943 return snd_timer_free(timer); 944 } 945 946 int snd_timer_global_register(snd_timer_t *timer) 947 { 948 snd_device_t dev; 949 950 memset(&dev, 0, sizeof(dev)); 951 dev.device_data = timer; 952 return snd_timer_dev_register(&dev); 953 } 954 955 int snd_timer_global_unregister(snd_timer_t *timer) 956 { 957 return snd_timer_unregister(timer); 958 } 959 960 /* 961 * System timer 962 */ 963 964 struct snd_timer_system_private { 965 struct timer_list tlist; 966 struct timer * timer; 967 unsigned long last_expires; 968 unsigned long last_jiffies; 969 unsigned long correction; 970 }; 971 972 static void snd_timer_s_function(unsigned long data) 973 { 974 snd_timer_t *timer = (snd_timer_t *)data; 975 struct snd_timer_system_private *priv = timer->private_data; 976 unsigned long jiff = jiffies; 977 if (time_after(jiff, priv->last_expires)) 978 priv->correction = (long)jiff - (long)priv->last_expires; 979 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 980 } 981 982 static int snd_timer_s_start(snd_timer_t * timer) 983 { 984 struct snd_timer_system_private *priv; 985 unsigned long njiff; 986 987 priv = (struct snd_timer_system_private *) timer->private_data; 988 njiff = (priv->last_jiffies = jiffies); 989 if (priv->correction > timer->sticks - 1) { 990 priv->correction -= timer->sticks - 1; 991 njiff++; 992 } else { 993 njiff += timer->sticks - priv->correction; 994 priv->correction -= timer->sticks; 995 } 996 priv->last_expires = priv->tlist.expires = njiff; 997 add_timer(&priv->tlist); 998 return 0; 999 } 1000 1001 static int snd_timer_s_stop(snd_timer_t * timer) 1002 { 1003 struct snd_timer_system_private *priv; 1004 unsigned long jiff; 1005 1006 priv = (struct snd_timer_system_private *) timer->private_data; 1007 del_timer(&priv->tlist); 1008 jiff = jiffies; 1009 if (time_before(jiff, priv->last_expires)) 1010 timer->sticks = priv->last_expires - jiff; 1011 else 1012 timer->sticks = 1; 1013 return 0; 1014 } 1015 1016 static struct _snd_timer_hardware snd_timer_system = 1017 { 1018 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1019 .resolution = 1000000000L / HZ, 1020 .ticks = 10000000L, 1021 .start = snd_timer_s_start, 1022 .stop = snd_timer_s_stop 1023 }; 1024 1025 static void snd_timer_free_system(snd_timer_t *timer) 1026 { 1027 kfree(timer->private_data); 1028 } 1029 1030 static int snd_timer_register_system(void) 1031 { 1032 snd_timer_t *timer; 1033 struct snd_timer_system_private *priv; 1034 int err; 1035 1036 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1037 if (err < 0) 1038 return err; 1039 strcpy(timer->name, "system timer"); 1040 timer->hw = snd_timer_system; 1041 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1042 if (priv == NULL) { 1043 snd_timer_free(timer); 1044 return -ENOMEM; 1045 } 1046 init_timer(&priv->tlist); 1047 priv->tlist.function = snd_timer_s_function; 1048 priv->tlist.data = (unsigned long) timer; 1049 timer->private_data = priv; 1050 timer->private_free = snd_timer_free_system; 1051 return snd_timer_global_register(timer); 1052 } 1053 1054 /* 1055 * Info interface 1056 */ 1057 1058 static void snd_timer_proc_read(snd_info_entry_t *entry, 1059 snd_info_buffer_t * buffer) 1060 { 1061 unsigned long flags; 1062 snd_timer_t *timer; 1063 snd_timer_instance_t *ti; 1064 struct list_head *p, *q; 1065 1066 down(®ister_mutex); 1067 list_for_each(p, &snd_timer_list) { 1068 timer = list_entry(p, snd_timer_t, device_list); 1069 switch (timer->tmr_class) { 1070 case SNDRV_TIMER_CLASS_GLOBAL: 1071 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1072 break; 1073 case SNDRV_TIMER_CLASS_CARD: 1074 snd_iprintf(buffer, "C%i-%i: ", 1075 timer->card->number, timer->tmr_device); 1076 break; 1077 case SNDRV_TIMER_CLASS_PCM: 1078 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1079 timer->tmr_device, timer->tmr_subdevice); 1080 break; 1081 default: 1082 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1083 timer->card ? timer->card->number : -1, 1084 timer->tmr_device, timer->tmr_subdevice); 1085 } 1086 snd_iprintf(buffer, "%s :", timer->name); 1087 if (timer->hw.resolution) 1088 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1089 timer->hw.resolution / 1000, 1090 timer->hw.resolution % 1000, 1091 timer->hw.ticks); 1092 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1093 snd_iprintf(buffer, " SLAVE"); 1094 snd_iprintf(buffer, "\n"); 1095 spin_lock_irqsave(&timer->lock, flags); 1096 list_for_each(q, &timer->open_list_head) { 1097 ti = list_entry(q, snd_timer_instance_t, open_list); 1098 snd_iprintf(buffer, " Client %s : %s\n", 1099 ti->owner ? ti->owner : "unknown", 1100 ti->flags & (SNDRV_TIMER_IFLG_START | 1101 SNDRV_TIMER_IFLG_RUNNING) 1102 ? "running" : "stopped"); 1103 } 1104 spin_unlock_irqrestore(&timer->lock, flags); 1105 } 1106 up(®ister_mutex); 1107 } 1108 1109 /* 1110 * USER SPACE interface 1111 */ 1112 1113 static void snd_timer_user_interrupt(snd_timer_instance_t *timeri, 1114 unsigned long resolution, 1115 unsigned long ticks) 1116 { 1117 snd_timer_user_t *tu = timeri->callback_data; 1118 snd_timer_read_t *r; 1119 int prev; 1120 1121 spin_lock(&tu->qlock); 1122 if (tu->qused > 0) { 1123 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1124 r = &tu->queue[prev]; 1125 if (r->resolution == resolution) { 1126 r->ticks += ticks; 1127 goto __wake; 1128 } 1129 } 1130 if (tu->qused >= tu->queue_size) { 1131 tu->overrun++; 1132 } else { 1133 r = &tu->queue[tu->qtail++]; 1134 tu->qtail %= tu->queue_size; 1135 r->resolution = resolution; 1136 r->ticks = ticks; 1137 tu->qused++; 1138 } 1139 __wake: 1140 spin_unlock(&tu->qlock); 1141 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1142 wake_up(&tu->qchange_sleep); 1143 } 1144 1145 static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu, 1146 snd_timer_tread_t *tread) 1147 { 1148 if (tu->qused >= tu->queue_size) { 1149 tu->overrun++; 1150 } else { 1151 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1152 tu->qtail %= tu->queue_size; 1153 tu->qused++; 1154 } 1155 } 1156 1157 static void snd_timer_user_ccallback(snd_timer_instance_t *timeri, 1158 enum sndrv_timer_event event, 1159 struct timespec *tstamp, 1160 unsigned long resolution) 1161 { 1162 snd_timer_user_t *tu = timeri->callback_data; 1163 snd_timer_tread_t r1; 1164 1165 if (event >= SNDRV_TIMER_EVENT_START && 1166 event <= SNDRV_TIMER_EVENT_PAUSE) 1167 tu->tstamp = *tstamp; 1168 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1169 return; 1170 r1.event = event; 1171 r1.tstamp = *tstamp; 1172 r1.val = resolution; 1173 spin_lock(&tu->qlock); 1174 snd_timer_user_append_to_tqueue(tu, &r1); 1175 spin_unlock(&tu->qlock); 1176 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1177 wake_up(&tu->qchange_sleep); 1178 } 1179 1180 static void snd_timer_user_tinterrupt(snd_timer_instance_t *timeri, 1181 unsigned long resolution, 1182 unsigned long ticks) 1183 { 1184 snd_timer_user_t *tu = timeri->callback_data; 1185 snd_timer_tread_t *r, r1; 1186 struct timespec tstamp; 1187 int prev, append = 0; 1188 1189 memset(&tstamp, 0, sizeof(tstamp)); 1190 spin_lock(&tu->qlock); 1191 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1192 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1193 spin_unlock(&tu->qlock); 1194 return; 1195 } 1196 if (tu->last_resolution != resolution || ticks > 0) 1197 getnstimeofday(&tstamp); 1198 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1199 tu->last_resolution != resolution) { 1200 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1201 r1.tstamp = tstamp; 1202 r1.val = resolution; 1203 snd_timer_user_append_to_tqueue(tu, &r1); 1204 tu->last_resolution = resolution; 1205 append++; 1206 } 1207 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1208 goto __wake; 1209 if (ticks == 0) 1210 goto __wake; 1211 if (tu->qused > 0) { 1212 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1213 r = &tu->tqueue[prev]; 1214 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1215 r->tstamp = tstamp; 1216 r->val += ticks; 1217 append++; 1218 goto __wake; 1219 } 1220 } 1221 r1.event = SNDRV_TIMER_EVENT_TICK; 1222 r1.tstamp = tstamp; 1223 r1.val = ticks; 1224 snd_timer_user_append_to_tqueue(tu, &r1); 1225 append++; 1226 __wake: 1227 spin_unlock(&tu->qlock); 1228 if (append == 0) 1229 return; 1230 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1231 wake_up(&tu->qchange_sleep); 1232 } 1233 1234 static int snd_timer_user_open(struct inode *inode, struct file *file) 1235 { 1236 snd_timer_user_t *tu; 1237 1238 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1239 if (tu == NULL) 1240 return -ENOMEM; 1241 spin_lock_init(&tu->qlock); 1242 init_waitqueue_head(&tu->qchange_sleep); 1243 init_MUTEX(&tu->tread_sem); 1244 tu->ticks = 1; 1245 tu->queue_size = 128; 1246 tu->queue = kmalloc(tu->queue_size * sizeof(snd_timer_read_t), 1247 GFP_KERNEL); 1248 if (tu->queue == NULL) { 1249 kfree(tu); 1250 return -ENOMEM; 1251 } 1252 file->private_data = tu; 1253 return 0; 1254 } 1255 1256 static int snd_timer_user_release(struct inode *inode, struct file *file) 1257 { 1258 snd_timer_user_t *tu; 1259 1260 if (file->private_data) { 1261 tu = file->private_data; 1262 file->private_data = NULL; 1263 fasync_helper(-1, file, 0, &tu->fasync); 1264 if (tu->timeri) 1265 snd_timer_close(tu->timeri); 1266 kfree(tu->queue); 1267 kfree(tu->tqueue); 1268 kfree(tu); 1269 } 1270 return 0; 1271 } 1272 1273 static void snd_timer_user_zero_id(snd_timer_id_t *id) 1274 { 1275 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1276 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1277 id->card = -1; 1278 id->device = -1; 1279 id->subdevice = -1; 1280 } 1281 1282 static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer) 1283 { 1284 id->dev_class = timer->tmr_class; 1285 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1286 id->card = timer->card ? timer->card->number : -1; 1287 id->device = timer->tmr_device; 1288 id->subdevice = timer->tmr_subdevice; 1289 } 1290 1291 static int snd_timer_user_next_device(snd_timer_id_t __user *_tid) 1292 { 1293 snd_timer_id_t id; 1294 snd_timer_t *timer; 1295 struct list_head *p; 1296 1297 if (copy_from_user(&id, _tid, sizeof(id))) 1298 return -EFAULT; 1299 down(®ister_mutex); 1300 if (id.dev_class < 0) { /* first item */ 1301 if (list_empty(&snd_timer_list)) 1302 snd_timer_user_zero_id(&id); 1303 else { 1304 timer = list_entry(snd_timer_list.next, 1305 snd_timer_t, device_list); 1306 snd_timer_user_copy_id(&id, timer); 1307 } 1308 } else { 1309 switch (id.dev_class) { 1310 case SNDRV_TIMER_CLASS_GLOBAL: 1311 id.device = id.device < 0 ? 0 : id.device + 1; 1312 list_for_each(p, &snd_timer_list) { 1313 timer = list_entry(p, snd_timer_t, device_list); 1314 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1315 snd_timer_user_copy_id(&id, timer); 1316 break; 1317 } 1318 if (timer->tmr_device >= id.device) { 1319 snd_timer_user_copy_id(&id, timer); 1320 break; 1321 } 1322 } 1323 if (p == &snd_timer_list) 1324 snd_timer_user_zero_id(&id); 1325 break; 1326 case SNDRV_TIMER_CLASS_CARD: 1327 case SNDRV_TIMER_CLASS_PCM: 1328 if (id.card < 0) { 1329 id.card = 0; 1330 } else { 1331 if (id.card < 0) { 1332 id.card = 0; 1333 } else { 1334 if (id.device < 0) { 1335 id.device = 0; 1336 } else { 1337 if (id.subdevice < 0) { 1338 id.subdevice = 0; 1339 } else { 1340 id.subdevice++; 1341 } 1342 } 1343 } 1344 } 1345 list_for_each(p, &snd_timer_list) { 1346 timer = list_entry(p, snd_timer_t, device_list); 1347 if (timer->tmr_class > id.dev_class) { 1348 snd_timer_user_copy_id(&id, timer); 1349 break; 1350 } 1351 if (timer->tmr_class < id.dev_class) 1352 continue; 1353 if (timer->card->number > id.card) { 1354 snd_timer_user_copy_id(&id, timer); 1355 break; 1356 } 1357 if (timer->card->number < id.card) 1358 continue; 1359 if (timer->tmr_device > id.device) { 1360 snd_timer_user_copy_id(&id, timer); 1361 break; 1362 } 1363 if (timer->tmr_device < id.device) 1364 continue; 1365 if (timer->tmr_subdevice > id.subdevice) { 1366 snd_timer_user_copy_id(&id, timer); 1367 break; 1368 } 1369 if (timer->tmr_subdevice < id.subdevice) 1370 continue; 1371 snd_timer_user_copy_id(&id, timer); 1372 break; 1373 } 1374 if (p == &snd_timer_list) 1375 snd_timer_user_zero_id(&id); 1376 break; 1377 default: 1378 snd_timer_user_zero_id(&id); 1379 } 1380 } 1381 up(®ister_mutex); 1382 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1383 return -EFAULT; 1384 return 0; 1385 } 1386 1387 static int snd_timer_user_ginfo(struct file *file, 1388 snd_timer_ginfo_t __user *_ginfo) 1389 { 1390 snd_timer_ginfo_t *ginfo; 1391 snd_timer_id_t tid; 1392 snd_timer_t *t; 1393 struct list_head *p; 1394 int err = 0; 1395 1396 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL); 1397 if (! ginfo) 1398 return -ENOMEM; 1399 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) { 1400 kfree(ginfo); 1401 return -EFAULT; 1402 } 1403 tid = ginfo->tid; 1404 memset(ginfo, 0, sizeof(*ginfo)); 1405 ginfo->tid = tid; 1406 down(®ister_mutex); 1407 t = snd_timer_find(&tid); 1408 if (t != NULL) { 1409 ginfo->card = t->card ? t->card->number : -1; 1410 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1411 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1412 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1413 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1414 ginfo->resolution = t->hw.resolution; 1415 if (t->hw.resolution_min > 0) { 1416 ginfo->resolution_min = t->hw.resolution_min; 1417 ginfo->resolution_max = t->hw.resolution_max; 1418 } 1419 list_for_each(p, &t->open_list_head) { 1420 ginfo->clients++; 1421 } 1422 } else { 1423 err = -ENODEV; 1424 } 1425 up(®ister_mutex); 1426 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1427 err = -EFAULT; 1428 kfree(ginfo); 1429 return err; 1430 } 1431 1432 static int snd_timer_user_gparams(struct file *file, 1433 snd_timer_gparams_t __user *_gparams) 1434 { 1435 snd_timer_gparams_t gparams; 1436 snd_timer_t *t; 1437 int err; 1438 1439 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1440 return -EFAULT; 1441 down(®ister_mutex); 1442 t = snd_timer_find(&gparams.tid); 1443 if (!t) { 1444 err = -ENODEV; 1445 goto _error; 1446 } 1447 if (!list_empty(&t->open_list_head)) { 1448 err = -EBUSY; 1449 goto _error; 1450 } 1451 if (!t->hw.set_period) { 1452 err = -ENOSYS; 1453 goto _error; 1454 } 1455 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1456 _error: 1457 up(®ister_mutex); 1458 return err; 1459 } 1460 1461 static int snd_timer_user_gstatus(struct file *file, 1462 snd_timer_gstatus_t __user *_gstatus) 1463 { 1464 snd_timer_gstatus_t gstatus; 1465 snd_timer_id_t tid; 1466 snd_timer_t *t; 1467 int err = 0; 1468 1469 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1470 return -EFAULT; 1471 tid = gstatus.tid; 1472 memset(&gstatus, 0, sizeof(gstatus)); 1473 gstatus.tid = tid; 1474 down(®ister_mutex); 1475 t = snd_timer_find(&tid); 1476 if (t != NULL) { 1477 if (t->hw.c_resolution) 1478 gstatus.resolution = t->hw.c_resolution(t); 1479 else 1480 gstatus.resolution = t->hw.resolution; 1481 if (t->hw.precise_resolution) { 1482 t->hw.precise_resolution(t, &gstatus.resolution_num, 1483 &gstatus.resolution_den); 1484 } else { 1485 gstatus.resolution_num = gstatus.resolution; 1486 gstatus.resolution_den = 1000000000uL; 1487 } 1488 } else { 1489 err = -ENODEV; 1490 } 1491 up(®ister_mutex); 1492 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1493 err = -EFAULT; 1494 return err; 1495 } 1496 1497 static int snd_timer_user_tselect(struct file *file, 1498 snd_timer_select_t __user *_tselect) 1499 { 1500 snd_timer_user_t *tu; 1501 snd_timer_select_t tselect; 1502 char str[32]; 1503 int err = 0; 1504 1505 tu = file->private_data; 1506 down(&tu->tread_sem); 1507 if (tu->timeri) { 1508 snd_timer_close(tu->timeri); 1509 tu->timeri = NULL; 1510 } 1511 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1512 err = -EFAULT; 1513 goto __err; 1514 } 1515 sprintf(str, "application %i", current->pid); 1516 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1517 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1518 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1519 if (err < 0) 1520 goto __err; 1521 1522 kfree(tu->queue); 1523 tu->queue = NULL; 1524 kfree(tu->tqueue); 1525 tu->tqueue = NULL; 1526 if (tu->tread) { 1527 tu->tqueue = kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), 1528 GFP_KERNEL); 1529 if (tu->tqueue == NULL) 1530 err = -ENOMEM; 1531 } else { 1532 tu->queue = kmalloc(tu->queue_size * sizeof(snd_timer_read_t), 1533 GFP_KERNEL); 1534 if (tu->queue == NULL) 1535 err = -ENOMEM; 1536 } 1537 1538 if (err < 0) { 1539 snd_timer_close(tu->timeri); 1540 tu->timeri = NULL; 1541 } else { 1542 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1543 tu->timeri->callback = tu->tread 1544 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1545 tu->timeri->ccallback = snd_timer_user_ccallback; 1546 tu->timeri->callback_data = (void *)tu; 1547 } 1548 1549 __err: 1550 up(&tu->tread_sem); 1551 return err; 1552 } 1553 1554 static int snd_timer_user_info(struct file *file, 1555 snd_timer_info_t __user *_info) 1556 { 1557 snd_timer_user_t *tu; 1558 snd_timer_info_t *info; 1559 snd_timer_t *t; 1560 int err = 0; 1561 1562 tu = file->private_data; 1563 snd_assert(tu->timeri != NULL, return -ENXIO); 1564 t = tu->timeri->timer; 1565 snd_assert(t != NULL, return -ENXIO); 1566 1567 info = kzalloc(sizeof(*info), GFP_KERNEL); 1568 if (! info) 1569 return -ENOMEM; 1570 info->card = t->card ? t->card->number : -1; 1571 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1572 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1573 strlcpy(info->id, t->id, sizeof(info->id)); 1574 strlcpy(info->name, t->name, sizeof(info->name)); 1575 info->resolution = t->hw.resolution; 1576 if (copy_to_user(_info, info, sizeof(*_info))) 1577 err = -EFAULT; 1578 kfree(info); 1579 return err; 1580 } 1581 1582 static int snd_timer_user_params(struct file *file, 1583 snd_timer_params_t __user *_params) 1584 { 1585 snd_timer_user_t *tu; 1586 snd_timer_params_t params; 1587 snd_timer_t *t; 1588 snd_timer_read_t *tr; 1589 snd_timer_tread_t *ttr; 1590 int err; 1591 1592 tu = file->private_data; 1593 snd_assert(tu->timeri != NULL, return -ENXIO); 1594 t = tu->timeri->timer; 1595 snd_assert(t != NULL, return -ENXIO); 1596 if (copy_from_user(¶ms, _params, sizeof(params))) 1597 return -EFAULT; 1598 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1599 err = -EINVAL; 1600 goto _end; 1601 } 1602 if (params.queue_size > 0 && 1603 (params.queue_size < 32 || params.queue_size > 1024)) { 1604 err = -EINVAL; 1605 goto _end; 1606 } 1607 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1608 (1<<SNDRV_TIMER_EVENT_TICK)| 1609 (1<<SNDRV_TIMER_EVENT_START)| 1610 (1<<SNDRV_TIMER_EVENT_STOP)| 1611 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1612 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1613 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1614 (1<<SNDRV_TIMER_EVENT_RESUME)| 1615 (1<<SNDRV_TIMER_EVENT_MSTART)| 1616 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1617 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1618 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1619 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1620 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1621 err = -EINVAL; 1622 goto _end; 1623 } 1624 snd_timer_stop(tu->timeri); 1625 spin_lock_irq(&t->lock); 1626 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1627 SNDRV_TIMER_IFLG_EXCLUSIVE| 1628 SNDRV_TIMER_IFLG_EARLY_EVENT); 1629 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1630 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1631 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1632 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1633 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1634 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1635 spin_unlock_irq(&t->lock); 1636 if (params.queue_size > 0 && 1637 (unsigned int)tu->queue_size != params.queue_size) { 1638 if (tu->tread) { 1639 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1640 GFP_KERNEL); 1641 if (ttr) { 1642 kfree(tu->tqueue); 1643 tu->queue_size = params.queue_size; 1644 tu->tqueue = ttr; 1645 } 1646 } else { 1647 tr = kmalloc(params.queue_size * sizeof(*tr), 1648 GFP_KERNEL); 1649 if (tr) { 1650 kfree(tu->queue); 1651 tu->queue_size = params.queue_size; 1652 tu->queue = tr; 1653 } 1654 } 1655 } 1656 tu->qhead = tu->qtail = tu->qused = 0; 1657 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1658 if (tu->tread) { 1659 snd_timer_tread_t tread; 1660 tread.event = SNDRV_TIMER_EVENT_EARLY; 1661 tread.tstamp.tv_sec = 0; 1662 tread.tstamp.tv_nsec = 0; 1663 tread.val = 0; 1664 snd_timer_user_append_to_tqueue(tu, &tread); 1665 } else { 1666 snd_timer_read_t *r = &tu->queue[0]; 1667 r->resolution = 0; 1668 r->ticks = 0; 1669 tu->qused++; 1670 tu->qtail++; 1671 } 1672 } 1673 tu->filter = params.filter; 1674 tu->ticks = params.ticks; 1675 err = 0; 1676 _end: 1677 if (copy_to_user(_params, ¶ms, sizeof(params))) 1678 return -EFAULT; 1679 return err; 1680 } 1681 1682 static int snd_timer_user_status(struct file *file, 1683 snd_timer_status_t __user *_status) 1684 { 1685 snd_timer_user_t *tu; 1686 snd_timer_status_t status; 1687 1688 tu = file->private_data; 1689 snd_assert(tu->timeri != NULL, return -ENXIO); 1690 memset(&status, 0, sizeof(status)); 1691 status.tstamp = tu->tstamp; 1692 status.resolution = snd_timer_resolution(tu->timeri); 1693 status.lost = tu->timeri->lost; 1694 status.overrun = tu->overrun; 1695 spin_lock_irq(&tu->qlock); 1696 status.queue = tu->qused; 1697 spin_unlock_irq(&tu->qlock); 1698 if (copy_to_user(_status, &status, sizeof(status))) 1699 return -EFAULT; 1700 return 0; 1701 } 1702 1703 static int snd_timer_user_start(struct file *file) 1704 { 1705 int err; 1706 snd_timer_user_t *tu; 1707 1708 tu = file->private_data; 1709 snd_assert(tu->timeri != NULL, return -ENXIO); 1710 snd_timer_stop(tu->timeri); 1711 tu->timeri->lost = 0; 1712 tu->last_resolution = 0; 1713 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1714 } 1715 1716 static int snd_timer_user_stop(struct file *file) 1717 { 1718 int err; 1719 snd_timer_user_t *tu; 1720 1721 tu = file->private_data; 1722 snd_assert(tu->timeri != NULL, return -ENXIO); 1723 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1724 } 1725 1726 static int snd_timer_user_continue(struct file *file) 1727 { 1728 int err; 1729 snd_timer_user_t *tu; 1730 1731 tu = file->private_data; 1732 snd_assert(tu->timeri != NULL, return -ENXIO); 1733 tu->timeri->lost = 0; 1734 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1735 } 1736 1737 static int snd_timer_user_pause(struct file *file) 1738 { 1739 int err; 1740 snd_timer_user_t *tu; 1741 1742 tu = file->private_data; 1743 snd_assert(tu->timeri != NULL, return -ENXIO); 1744 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1745 } 1746 1747 enum { 1748 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1749 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1750 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1751 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1752 }; 1753 1754 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1755 unsigned long arg) 1756 { 1757 snd_timer_user_t *tu; 1758 void __user *argp = (void __user *)arg; 1759 int __user *p = argp; 1760 1761 tu = file->private_data; 1762 switch (cmd) { 1763 case SNDRV_TIMER_IOCTL_PVERSION: 1764 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1765 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1766 return snd_timer_user_next_device(argp); 1767 case SNDRV_TIMER_IOCTL_TREAD: 1768 { 1769 int xarg; 1770 1771 down(&tu->tread_sem); 1772 if (tu->timeri) { /* too late */ 1773 up(&tu->tread_sem); 1774 return -EBUSY; 1775 } 1776 if (get_user(xarg, p)) { 1777 up(&tu->tread_sem); 1778 return -EFAULT; 1779 } 1780 tu->tread = xarg ? 1 : 0; 1781 up(&tu->tread_sem); 1782 return 0; 1783 } 1784 case SNDRV_TIMER_IOCTL_GINFO: 1785 return snd_timer_user_ginfo(file, argp); 1786 case SNDRV_TIMER_IOCTL_GPARAMS: 1787 return snd_timer_user_gparams(file, argp); 1788 case SNDRV_TIMER_IOCTL_GSTATUS: 1789 return snd_timer_user_gstatus(file, argp); 1790 case SNDRV_TIMER_IOCTL_SELECT: 1791 return snd_timer_user_tselect(file, argp); 1792 case SNDRV_TIMER_IOCTL_INFO: 1793 return snd_timer_user_info(file, argp); 1794 case SNDRV_TIMER_IOCTL_PARAMS: 1795 return snd_timer_user_params(file, argp); 1796 case SNDRV_TIMER_IOCTL_STATUS: 1797 return snd_timer_user_status(file, argp); 1798 case SNDRV_TIMER_IOCTL_START: 1799 case SNDRV_TIMER_IOCTL_START_OLD: 1800 return snd_timer_user_start(file); 1801 case SNDRV_TIMER_IOCTL_STOP: 1802 case SNDRV_TIMER_IOCTL_STOP_OLD: 1803 return snd_timer_user_stop(file); 1804 case SNDRV_TIMER_IOCTL_CONTINUE: 1805 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1806 return snd_timer_user_continue(file); 1807 case SNDRV_TIMER_IOCTL_PAUSE: 1808 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1809 return snd_timer_user_pause(file); 1810 } 1811 return -ENOTTY; 1812 } 1813 1814 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1815 { 1816 snd_timer_user_t *tu; 1817 int err; 1818 1819 tu = file->private_data; 1820 err = fasync_helper(fd, file, on, &tu->fasync); 1821 if (err < 0) 1822 return err; 1823 return 0; 1824 } 1825 1826 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1827 size_t count, loff_t *offset) 1828 { 1829 snd_timer_user_t *tu; 1830 long result = 0, unit; 1831 int err = 0; 1832 1833 tu = file->private_data; 1834 unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t); 1835 spin_lock_irq(&tu->qlock); 1836 while ((long)count - result >= unit) { 1837 while (!tu->qused) { 1838 wait_queue_t wait; 1839 1840 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1841 err = -EAGAIN; 1842 break; 1843 } 1844 1845 set_current_state(TASK_INTERRUPTIBLE); 1846 init_waitqueue_entry(&wait, current); 1847 add_wait_queue(&tu->qchange_sleep, &wait); 1848 1849 spin_unlock_irq(&tu->qlock); 1850 schedule(); 1851 spin_lock_irq(&tu->qlock); 1852 1853 remove_wait_queue(&tu->qchange_sleep, &wait); 1854 1855 if (signal_pending(current)) { 1856 err = -ERESTARTSYS; 1857 break; 1858 } 1859 } 1860 1861 spin_unlock_irq(&tu->qlock); 1862 if (err < 0) 1863 goto _error; 1864 1865 if (tu->tread) { 1866 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1867 sizeof(snd_timer_tread_t))) { 1868 err = -EFAULT; 1869 goto _error; 1870 } 1871 } else { 1872 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1873 sizeof(snd_timer_read_t))) { 1874 err = -EFAULT; 1875 goto _error; 1876 } 1877 } 1878 1879 tu->qhead %= tu->queue_size; 1880 1881 result += unit; 1882 buffer += unit; 1883 1884 spin_lock_irq(&tu->qlock); 1885 tu->qused--; 1886 } 1887 spin_unlock_irq(&tu->qlock); 1888 _error: 1889 return result > 0 ? result : err; 1890 } 1891 1892 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1893 { 1894 unsigned int mask; 1895 snd_timer_user_t *tu; 1896 1897 tu = file->private_data; 1898 1899 poll_wait(file, &tu->qchange_sleep, wait); 1900 1901 mask = 0; 1902 if (tu->qused) 1903 mask |= POLLIN | POLLRDNORM; 1904 1905 return mask; 1906 } 1907 1908 #ifdef CONFIG_COMPAT 1909 #include "timer_compat.c" 1910 #else 1911 #define snd_timer_user_ioctl_compat NULL 1912 #endif 1913 1914 static struct file_operations snd_timer_f_ops = 1915 { 1916 .owner = THIS_MODULE, 1917 .read = snd_timer_user_read, 1918 .open = snd_timer_user_open, 1919 .release = snd_timer_user_release, 1920 .poll = snd_timer_user_poll, 1921 .unlocked_ioctl = snd_timer_user_ioctl, 1922 .compat_ioctl = snd_timer_user_ioctl_compat, 1923 .fasync = snd_timer_user_fasync, 1924 }; 1925 1926 static snd_minor_t snd_timer_reg = 1927 { 1928 .comment = "timer", 1929 .f_ops = &snd_timer_f_ops, 1930 }; 1931 1932 /* 1933 * ENTRY functions 1934 */ 1935 1936 static snd_info_entry_t *snd_timer_proc_entry = NULL; 1937 1938 static int __init alsa_timer_init(void) 1939 { 1940 int err; 1941 snd_info_entry_t *entry; 1942 1943 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1944 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 1945 "system timer"); 1946 #endif 1947 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1948 if (entry != NULL) { 1949 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128; 1950 entry->c.text.read = snd_timer_proc_read; 1951 if (snd_info_register(entry) < 0) { 1952 snd_info_free_entry(entry); 1953 entry = NULL; 1954 } 1955 } 1956 snd_timer_proc_entry = entry; 1957 if ((err = snd_timer_register_system()) < 0) 1958 snd_printk(KERN_ERR "unable to register system timer (%i)\n", 1959 err); 1960 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, 1961 NULL, 0, &snd_timer_reg, "timer"))<0) 1962 snd_printk(KERN_ERR "unable to register timer device (%i)\n", 1963 err); 1964 return 0; 1965 } 1966 1967 static void __exit alsa_timer_exit(void) 1968 { 1969 struct list_head *p, *n; 1970 1971 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 1972 /* unregister the system timer */ 1973 list_for_each_safe(p, n, &snd_timer_list) { 1974 snd_timer_t *timer = list_entry(p, snd_timer_t, device_list); 1975 snd_timer_unregister(timer); 1976 } 1977 if (snd_timer_proc_entry) { 1978 snd_info_unregister(snd_timer_proc_entry); 1979 snd_timer_proc_entry = NULL; 1980 } 1981 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1982 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1983 #endif 1984 } 1985 1986 module_init(alsa_timer_init) 1987 module_exit(alsa_timer_exit) 1988 1989 EXPORT_SYMBOL(snd_timer_open); 1990 EXPORT_SYMBOL(snd_timer_close); 1991 EXPORT_SYMBOL(snd_timer_resolution); 1992 EXPORT_SYMBOL(snd_timer_start); 1993 EXPORT_SYMBOL(snd_timer_stop); 1994 EXPORT_SYMBOL(snd_timer_continue); 1995 EXPORT_SYMBOL(snd_timer_pause); 1996 EXPORT_SYMBOL(snd_timer_new); 1997 EXPORT_SYMBOL(snd_timer_notify); 1998 EXPORT_SYMBOL(snd_timer_global_new); 1999 EXPORT_SYMBOL(snd_timer_global_free); 2000 EXPORT_SYMBOL(snd_timer_global_register); 2001 EXPORT_SYMBOL(snd_timer_global_unregister); 2002 EXPORT_SYMBOL(snd_timer_interrupt); 2003