1 /* 2 * Timers abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/delay.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/time.h> 26 #include <linux/mutex.h> 27 #include <linux/device.h> 28 #include <linux/module.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 38 #if defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE) 39 #define DEFAULT_TIMER_LIMIT 4 40 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE) 41 #define DEFAULT_TIMER_LIMIT 2 42 #else 43 #define DEFAULT_TIMER_LIMIT 1 44 #endif 45 46 static int timer_limit = DEFAULT_TIMER_LIMIT; 47 static int timer_tstamp_monotonic = 1; 48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); 49 MODULE_DESCRIPTION("ALSA timer interface"); 50 MODULE_LICENSE("GPL"); 51 module_param(timer_limit, int, 0444); 52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 53 module_param(timer_tstamp_monotonic, int, 0444); 54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); 55 56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); 57 MODULE_ALIAS("devname:snd/timer"); 58 59 struct snd_timer_user { 60 struct snd_timer_instance *timeri; 61 int tread; /* enhanced read with timestamps and events */ 62 unsigned long ticks; 63 unsigned long overrun; 64 int qhead; 65 int qtail; 66 int qused; 67 int queue_size; 68 struct snd_timer_read *queue; 69 struct snd_timer_tread *tqueue; 70 spinlock_t qlock; 71 unsigned long last_resolution; 72 unsigned int filter; 73 struct timespec tstamp; /* trigger tstamp */ 74 wait_queue_head_t qchange_sleep; 75 struct fasync_struct *fasync; 76 struct mutex tread_sem; 77 }; 78 79 /* list of timers */ 80 static LIST_HEAD(snd_timer_list); 81 82 /* list of slave instances */ 83 static LIST_HEAD(snd_timer_slave_list); 84 85 /* lock for slave active lists */ 86 static DEFINE_SPINLOCK(slave_active_lock); 87 88 static DEFINE_MUTEX(register_mutex); 89 90 static int snd_timer_free(struct snd_timer *timer); 91 static int snd_timer_dev_free(struct snd_device *device); 92 static int snd_timer_dev_register(struct snd_device *device); 93 static int snd_timer_dev_disconnect(struct snd_device *device); 94 95 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 96 97 /* 98 * create a timer instance with the given owner string. 99 * when timer is not NULL, increments the module counter 100 */ 101 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 102 struct snd_timer *timer) 103 { 104 struct snd_timer_instance *timeri; 105 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 106 if (timeri == NULL) 107 return NULL; 108 timeri->owner = kstrdup(owner, GFP_KERNEL); 109 if (! timeri->owner) { 110 kfree(timeri); 111 return NULL; 112 } 113 INIT_LIST_HEAD(&timeri->open_list); 114 INIT_LIST_HEAD(&timeri->active_list); 115 INIT_LIST_HEAD(&timeri->ack_list); 116 INIT_LIST_HEAD(&timeri->slave_list_head); 117 INIT_LIST_HEAD(&timeri->slave_active_head); 118 119 timeri->timer = timer; 120 if (timer && !try_module_get(timer->module)) { 121 kfree(timeri->owner); 122 kfree(timeri); 123 return NULL; 124 } 125 126 return timeri; 127 } 128 129 /* 130 * find a timer instance from the given timer id 131 */ 132 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 133 { 134 struct snd_timer *timer = NULL; 135 136 list_for_each_entry(timer, &snd_timer_list, device_list) { 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_MODULES 154 155 static void snd_timer_request(struct snd_timer_id *tid) 156 { 157 switch (tid->dev_class) { 158 case SNDRV_TIMER_CLASS_GLOBAL: 159 if (tid->device < timer_limit) 160 request_module("snd-timer-%i", tid->device); 161 break; 162 case SNDRV_TIMER_CLASS_CARD: 163 case SNDRV_TIMER_CLASS_PCM: 164 if (tid->card < snd_ecards_limit) 165 request_module("snd-card-%i", tid->card); 166 break; 167 default: 168 break; 169 } 170 } 171 172 #endif 173 174 /* 175 * look for a master instance matching with the slave id of the given slave. 176 * when found, relink the open_link of the slave. 177 * 178 * call this with register_mutex down. 179 */ 180 static void snd_timer_check_slave(struct snd_timer_instance *slave) 181 { 182 struct snd_timer *timer; 183 struct snd_timer_instance *master; 184 185 /* FIXME: it's really dumb to look up all entries.. */ 186 list_for_each_entry(timer, &snd_timer_list, device_list) { 187 list_for_each_entry(master, &timer->open_list_head, open_list) { 188 if (slave->slave_class == master->slave_class && 189 slave->slave_id == master->slave_id) { 190 list_move_tail(&slave->open_list, 191 &master->slave_list_head); 192 spin_lock_irq(&slave_active_lock); 193 slave->master = master; 194 slave->timer = master->timer; 195 spin_unlock_irq(&slave_active_lock); 196 return; 197 } 198 } 199 } 200 } 201 202 /* 203 * look for slave instances matching with the slave id of the given master. 204 * when found, relink the open_link of slaves. 205 * 206 * call this with register_mutex down. 207 */ 208 static void snd_timer_check_master(struct snd_timer_instance *master) 209 { 210 struct snd_timer_instance *slave, *tmp; 211 212 /* check all pending slaves */ 213 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 214 if (slave->slave_class == master->slave_class && 215 slave->slave_id == master->slave_id) { 216 list_move_tail(&slave->open_list, &master->slave_list_head); 217 spin_lock_irq(&slave_active_lock); 218 slave->master = master; 219 slave->timer = master->timer; 220 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 221 list_add_tail(&slave->active_list, 222 &master->slave_active_head); 223 spin_unlock_irq(&slave_active_lock); 224 } 225 } 226 } 227 228 /* 229 * open a timer instance 230 * when opening a master, the slave id must be here given. 231 */ 232 int snd_timer_open(struct snd_timer_instance **ti, 233 char *owner, struct snd_timer_id *tid, 234 unsigned int slave_id) 235 { 236 struct snd_timer *timer; 237 struct snd_timer_instance *timeri = NULL; 238 239 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 240 /* open a slave instance */ 241 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 242 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 243 snd_printd("invalid slave class %i\n", tid->dev_sclass); 244 return -EINVAL; 245 } 246 mutex_lock(®ister_mutex); 247 timeri = snd_timer_instance_new(owner, NULL); 248 if (!timeri) { 249 mutex_unlock(®ister_mutex); 250 return -ENOMEM; 251 } 252 timeri->slave_class = tid->dev_sclass; 253 timeri->slave_id = tid->device; 254 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 255 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 256 snd_timer_check_slave(timeri); 257 mutex_unlock(®ister_mutex); 258 *ti = timeri; 259 return 0; 260 } 261 262 /* open a master instance */ 263 mutex_lock(®ister_mutex); 264 timer = snd_timer_find(tid); 265 #ifdef CONFIG_MODULES 266 if (!timer) { 267 mutex_unlock(®ister_mutex); 268 snd_timer_request(tid); 269 mutex_lock(®ister_mutex); 270 timer = snd_timer_find(tid); 271 } 272 #endif 273 if (!timer) { 274 mutex_unlock(®ister_mutex); 275 return -ENODEV; 276 } 277 if (!list_empty(&timer->open_list_head)) { 278 timeri = list_entry(timer->open_list_head.next, 279 struct snd_timer_instance, open_list); 280 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 281 mutex_unlock(®ister_mutex); 282 return -EBUSY; 283 } 284 } 285 timeri = snd_timer_instance_new(owner, timer); 286 if (!timeri) { 287 mutex_unlock(®ister_mutex); 288 return -ENOMEM; 289 } 290 timeri->slave_class = tid->dev_sclass; 291 timeri->slave_id = slave_id; 292 if (list_empty(&timer->open_list_head) && timer->hw.open) 293 timer->hw.open(timer); 294 list_add_tail(&timeri->open_list, &timer->open_list_head); 295 snd_timer_check_master(timeri); 296 mutex_unlock(®ister_mutex); 297 *ti = timeri; 298 return 0; 299 } 300 301 static int _snd_timer_stop(struct snd_timer_instance *timeri, 302 int keep_flag, int event); 303 304 /* 305 * close a timer instance 306 */ 307 int snd_timer_close(struct snd_timer_instance *timeri) 308 { 309 struct snd_timer *timer = NULL; 310 struct snd_timer_instance *slave, *tmp; 311 312 if (snd_BUG_ON(!timeri)) 313 return -ENXIO; 314 315 /* force to stop the timer */ 316 snd_timer_stop(timeri); 317 318 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 319 /* wait, until the active callback is finished */ 320 spin_lock_irq(&slave_active_lock); 321 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 322 spin_unlock_irq(&slave_active_lock); 323 udelay(10); 324 spin_lock_irq(&slave_active_lock); 325 } 326 spin_unlock_irq(&slave_active_lock); 327 mutex_lock(®ister_mutex); 328 list_del(&timeri->open_list); 329 mutex_unlock(®ister_mutex); 330 } else { 331 timer = timeri->timer; 332 if (snd_BUG_ON(!timer)) 333 goto out; 334 /* wait, until the active callback is finished */ 335 spin_lock_irq(&timer->lock); 336 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 337 spin_unlock_irq(&timer->lock); 338 udelay(10); 339 spin_lock_irq(&timer->lock); 340 } 341 spin_unlock_irq(&timer->lock); 342 mutex_lock(®ister_mutex); 343 list_del(&timeri->open_list); 344 if (timer && list_empty(&timer->open_list_head) && 345 timer->hw.close) 346 timer->hw.close(timer); 347 /* remove slave links */ 348 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 349 open_list) { 350 spin_lock_irq(&slave_active_lock); 351 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); 352 list_move_tail(&slave->open_list, &snd_timer_slave_list); 353 slave->master = NULL; 354 slave->timer = NULL; 355 spin_unlock_irq(&slave_active_lock); 356 } 357 mutex_unlock(®ister_mutex); 358 } 359 out: 360 if (timeri->private_free) 361 timeri->private_free(timeri); 362 kfree(timeri->owner); 363 kfree(timeri); 364 if (timer) 365 module_put(timer->module); 366 return 0; 367 } 368 369 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 370 { 371 struct snd_timer * timer; 372 373 if (timeri == NULL) 374 return 0; 375 if ((timer = timeri->timer) != NULL) { 376 if (timer->hw.c_resolution) 377 return timer->hw.c_resolution(timer); 378 return timer->hw.resolution; 379 } 380 return 0; 381 } 382 383 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 384 { 385 struct snd_timer *timer; 386 unsigned long flags; 387 unsigned long resolution = 0; 388 struct snd_timer_instance *ts; 389 struct timespec tstamp; 390 391 if (timer_tstamp_monotonic) 392 do_posix_clock_monotonic_gettime(&tstamp); 393 else 394 getnstimeofday(&tstamp); 395 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 396 event > SNDRV_TIMER_EVENT_PAUSE)) 397 return; 398 if (event == SNDRV_TIMER_EVENT_START || 399 event == SNDRV_TIMER_EVENT_CONTINUE) 400 resolution = snd_timer_resolution(ti); 401 if (ti->ccallback) 402 ti->ccallback(ti, event, &tstamp, resolution); 403 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 404 return; 405 timer = ti->timer; 406 if (timer == NULL) 407 return; 408 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 409 return; 410 spin_lock_irqsave(&timer->lock, flags); 411 list_for_each_entry(ts, &ti->slave_active_head, active_list) 412 if (ts->ccallback) 413 ts->ccallback(ti, event + 100, &tstamp, resolution); 414 spin_unlock_irqrestore(&timer->lock, flags); 415 } 416 417 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 418 unsigned long sticks) 419 { 420 list_move_tail(&timeri->active_list, &timer->active_list_head); 421 if (timer->running) { 422 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 423 goto __start_now; 424 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 425 timeri->flags |= SNDRV_TIMER_IFLG_START; 426 return 1; /* delayed start */ 427 } else { 428 timer->sticks = sticks; 429 timer->hw.start(timer); 430 __start_now: 431 timer->running++; 432 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 433 return 0; 434 } 435 } 436 437 static int snd_timer_start_slave(struct snd_timer_instance *timeri) 438 { 439 unsigned long flags; 440 441 spin_lock_irqsave(&slave_active_lock, flags); 442 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 443 if (timeri->master) 444 list_add_tail(&timeri->active_list, 445 &timeri->master->slave_active_head); 446 spin_unlock_irqrestore(&slave_active_lock, flags); 447 return 1; /* delayed start */ 448 } 449 450 /* 451 * start the timer instance 452 */ 453 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 454 { 455 struct snd_timer *timer; 456 int result = -EINVAL; 457 unsigned long flags; 458 459 if (timeri == NULL || ticks < 1) 460 return -EINVAL; 461 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 462 result = snd_timer_start_slave(timeri); 463 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 464 return result; 465 } 466 timer = timeri->timer; 467 if (timer == NULL) 468 return -EINVAL; 469 spin_lock_irqsave(&timer->lock, flags); 470 timeri->ticks = timeri->cticks = ticks; 471 timeri->pticks = 0; 472 result = snd_timer_start1(timer, timeri, ticks); 473 spin_unlock_irqrestore(&timer->lock, flags); 474 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 475 return result; 476 } 477 478 static int _snd_timer_stop(struct snd_timer_instance * timeri, 479 int keep_flag, int event) 480 { 481 struct snd_timer *timer; 482 unsigned long flags; 483 484 if (snd_BUG_ON(!timeri)) 485 return -ENXIO; 486 487 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 488 if (!keep_flag) { 489 spin_lock_irqsave(&slave_active_lock, flags); 490 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 491 spin_unlock_irqrestore(&slave_active_lock, flags); 492 } 493 goto __end; 494 } 495 timer = timeri->timer; 496 if (!timer) 497 return -EINVAL; 498 spin_lock_irqsave(&timer->lock, flags); 499 list_del_init(&timeri->ack_list); 500 list_del_init(&timeri->active_list); 501 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 502 !(--timer->running)) { 503 timer->hw.stop(timer); 504 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 505 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 506 snd_timer_reschedule(timer, 0); 507 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 508 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 509 timer->hw.start(timer); 510 } 511 } 512 } 513 if (!keep_flag) 514 timeri->flags &= 515 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 516 spin_unlock_irqrestore(&timer->lock, flags); 517 __end: 518 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 519 snd_timer_notify1(timeri, event); 520 return 0; 521 } 522 523 /* 524 * stop the timer instance. 525 * 526 * do not call this from the timer callback! 527 */ 528 int snd_timer_stop(struct snd_timer_instance *timeri) 529 { 530 struct snd_timer *timer; 531 unsigned long flags; 532 int err; 533 534 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); 535 if (err < 0) 536 return err; 537 timer = timeri->timer; 538 if (!timer) 539 return -EINVAL; 540 spin_lock_irqsave(&timer->lock, flags); 541 timeri->cticks = timeri->ticks; 542 timeri->pticks = 0; 543 spin_unlock_irqrestore(&timer->lock, flags); 544 return 0; 545 } 546 547 /* 548 * start again.. the tick is kept. 549 */ 550 int snd_timer_continue(struct snd_timer_instance *timeri) 551 { 552 struct snd_timer *timer; 553 int result = -EINVAL; 554 unsigned long flags; 555 556 if (timeri == NULL) 557 return result; 558 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 559 return snd_timer_start_slave(timeri); 560 timer = timeri->timer; 561 if (! timer) 562 return -EINVAL; 563 spin_lock_irqsave(&timer->lock, flags); 564 if (!timeri->cticks) 565 timeri->cticks = 1; 566 timeri->pticks = 0; 567 result = snd_timer_start1(timer, timeri, timer->sticks); 568 spin_unlock_irqrestore(&timer->lock, flags); 569 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 570 return result; 571 } 572 573 /* 574 * pause.. remember the ticks left 575 */ 576 int snd_timer_pause(struct snd_timer_instance * timeri) 577 { 578 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); 579 } 580 581 /* 582 * reschedule the timer 583 * 584 * start pending instances and check the scheduling ticks. 585 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 586 */ 587 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 588 { 589 struct snd_timer_instance *ti; 590 unsigned long ticks = ~0UL; 591 592 list_for_each_entry(ti, &timer->active_list_head, active_list) { 593 if (ti->flags & SNDRV_TIMER_IFLG_START) { 594 ti->flags &= ~SNDRV_TIMER_IFLG_START; 595 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 596 timer->running++; 597 } 598 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 599 if (ticks > ti->cticks) 600 ticks = ti->cticks; 601 } 602 } 603 if (ticks == ~0UL) { 604 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 605 return; 606 } 607 if (ticks > timer->hw.ticks) 608 ticks = timer->hw.ticks; 609 if (ticks_left != ticks) 610 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 611 timer->sticks = ticks; 612 } 613 614 /* 615 * timer tasklet 616 * 617 */ 618 static void snd_timer_tasklet(unsigned long arg) 619 { 620 struct snd_timer *timer = (struct snd_timer *) arg; 621 struct snd_timer_instance *ti; 622 struct list_head *p; 623 unsigned long resolution, ticks; 624 unsigned long flags; 625 626 spin_lock_irqsave(&timer->lock, flags); 627 /* now process all callbacks */ 628 while (!list_empty(&timer->sack_list_head)) { 629 p = timer->sack_list_head.next; /* get first item */ 630 ti = list_entry(p, struct snd_timer_instance, ack_list); 631 632 /* remove from ack_list and make empty */ 633 list_del_init(p); 634 635 ticks = ti->pticks; 636 ti->pticks = 0; 637 resolution = ti->resolution; 638 639 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 640 spin_unlock(&timer->lock); 641 if (ti->callback) 642 ti->callback(ti, resolution, ticks); 643 spin_lock(&timer->lock); 644 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 645 } 646 spin_unlock_irqrestore(&timer->lock, flags); 647 } 648 649 /* 650 * timer interrupt 651 * 652 * ticks_left is usually equal to timer->sticks. 653 * 654 */ 655 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 656 { 657 struct snd_timer_instance *ti, *ts, *tmp; 658 unsigned long resolution, ticks; 659 struct list_head *p, *ack_list_head; 660 unsigned long flags; 661 int use_tasklet = 0; 662 663 if (timer == NULL) 664 return; 665 666 spin_lock_irqsave(&timer->lock, flags); 667 668 /* remember the current resolution */ 669 if (timer->hw.c_resolution) 670 resolution = timer->hw.c_resolution(timer); 671 else 672 resolution = timer->hw.resolution; 673 674 /* loop for all active instances 675 * Here we cannot use list_for_each_entry because the active_list of a 676 * processed instance is relinked to done_list_head before the callback 677 * is called. 678 */ 679 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 680 active_list) { 681 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 682 continue; 683 ti->pticks += ticks_left; 684 ti->resolution = resolution; 685 if (ti->cticks < ticks_left) 686 ti->cticks = 0; 687 else 688 ti->cticks -= ticks_left; 689 if (ti->cticks) /* not expired */ 690 continue; 691 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 692 ti->cticks = ti->ticks; 693 } else { 694 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 695 if (--timer->running) 696 list_del(&ti->active_list); 697 } 698 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 699 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 700 ack_list_head = &timer->ack_list_head; 701 else 702 ack_list_head = &timer->sack_list_head; 703 if (list_empty(&ti->ack_list)) 704 list_add_tail(&ti->ack_list, ack_list_head); 705 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 706 ts->pticks = ti->pticks; 707 ts->resolution = resolution; 708 if (list_empty(&ts->ack_list)) 709 list_add_tail(&ts->ack_list, ack_list_head); 710 } 711 } 712 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 713 snd_timer_reschedule(timer, timer->sticks); 714 if (timer->running) { 715 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 716 timer->hw.stop(timer); 717 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 718 } 719 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 720 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 721 /* restart timer */ 722 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 723 timer->hw.start(timer); 724 } 725 } else { 726 timer->hw.stop(timer); 727 } 728 729 /* now process all fast callbacks */ 730 while (!list_empty(&timer->ack_list_head)) { 731 p = timer->ack_list_head.next; /* get first item */ 732 ti = list_entry(p, struct snd_timer_instance, ack_list); 733 734 /* remove from ack_list and make empty */ 735 list_del_init(p); 736 737 ticks = ti->pticks; 738 ti->pticks = 0; 739 740 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 741 spin_unlock(&timer->lock); 742 if (ti->callback) 743 ti->callback(ti, resolution, ticks); 744 spin_lock(&timer->lock); 745 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 746 } 747 748 /* do we have any slow callbacks? */ 749 use_tasklet = !list_empty(&timer->sack_list_head); 750 spin_unlock_irqrestore(&timer->lock, flags); 751 752 if (use_tasklet) 753 tasklet_schedule(&timer->task_queue); 754 } 755 756 /* 757 758 */ 759 760 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 761 struct snd_timer **rtimer) 762 { 763 struct snd_timer *timer; 764 int err; 765 static struct snd_device_ops ops = { 766 .dev_free = snd_timer_dev_free, 767 .dev_register = snd_timer_dev_register, 768 .dev_disconnect = snd_timer_dev_disconnect, 769 }; 770 771 if (snd_BUG_ON(!tid)) 772 return -EINVAL; 773 if (rtimer) 774 *rtimer = NULL; 775 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 776 if (timer == NULL) { 777 snd_printk(KERN_ERR "timer: cannot allocate\n"); 778 return -ENOMEM; 779 } 780 timer->tmr_class = tid->dev_class; 781 timer->card = card; 782 timer->tmr_device = tid->device; 783 timer->tmr_subdevice = tid->subdevice; 784 if (id) 785 strlcpy(timer->id, id, sizeof(timer->id)); 786 INIT_LIST_HEAD(&timer->device_list); 787 INIT_LIST_HEAD(&timer->open_list_head); 788 INIT_LIST_HEAD(&timer->active_list_head); 789 INIT_LIST_HEAD(&timer->ack_list_head); 790 INIT_LIST_HEAD(&timer->sack_list_head); 791 spin_lock_init(&timer->lock); 792 tasklet_init(&timer->task_queue, snd_timer_tasklet, 793 (unsigned long)timer); 794 if (card != NULL) { 795 timer->module = card->module; 796 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 797 if (err < 0) { 798 snd_timer_free(timer); 799 return err; 800 } 801 } 802 if (rtimer) 803 *rtimer = timer; 804 return 0; 805 } 806 807 static int snd_timer_free(struct snd_timer *timer) 808 { 809 if (!timer) 810 return 0; 811 812 mutex_lock(®ister_mutex); 813 if (! list_empty(&timer->open_list_head)) { 814 struct list_head *p, *n; 815 struct snd_timer_instance *ti; 816 snd_printk(KERN_WARNING "timer %p is busy?\n", timer); 817 list_for_each_safe(p, n, &timer->open_list_head) { 818 list_del_init(p); 819 ti = list_entry(p, struct snd_timer_instance, open_list); 820 ti->timer = NULL; 821 } 822 } 823 list_del(&timer->device_list); 824 mutex_unlock(®ister_mutex); 825 826 if (timer->private_free) 827 timer->private_free(timer); 828 kfree(timer); 829 return 0; 830 } 831 832 static int snd_timer_dev_free(struct snd_device *device) 833 { 834 struct snd_timer *timer = device->device_data; 835 return snd_timer_free(timer); 836 } 837 838 static int snd_timer_dev_register(struct snd_device *dev) 839 { 840 struct snd_timer *timer = dev->device_data; 841 struct snd_timer *timer1; 842 843 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 844 return -ENXIO; 845 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 846 !timer->hw.resolution && timer->hw.c_resolution == NULL) 847 return -EINVAL; 848 849 mutex_lock(®ister_mutex); 850 list_for_each_entry(timer1, &snd_timer_list, device_list) { 851 if (timer1->tmr_class > timer->tmr_class) 852 break; 853 if (timer1->tmr_class < timer->tmr_class) 854 continue; 855 if (timer1->card && timer->card) { 856 if (timer1->card->number > timer->card->number) 857 break; 858 if (timer1->card->number < timer->card->number) 859 continue; 860 } 861 if (timer1->tmr_device > timer->tmr_device) 862 break; 863 if (timer1->tmr_device < timer->tmr_device) 864 continue; 865 if (timer1->tmr_subdevice > timer->tmr_subdevice) 866 break; 867 if (timer1->tmr_subdevice < timer->tmr_subdevice) 868 continue; 869 /* conflicts.. */ 870 mutex_unlock(®ister_mutex); 871 return -EBUSY; 872 } 873 list_add_tail(&timer->device_list, &timer1->device_list); 874 mutex_unlock(®ister_mutex); 875 return 0; 876 } 877 878 static int snd_timer_dev_disconnect(struct snd_device *device) 879 { 880 struct snd_timer *timer = device->device_data; 881 mutex_lock(®ister_mutex); 882 list_del_init(&timer->device_list); 883 mutex_unlock(®ister_mutex); 884 return 0; 885 } 886 887 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 888 { 889 unsigned long flags; 890 unsigned long resolution = 0; 891 struct snd_timer_instance *ti, *ts; 892 893 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 894 return; 895 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 896 event > SNDRV_TIMER_EVENT_MRESUME)) 897 return; 898 spin_lock_irqsave(&timer->lock, flags); 899 if (event == SNDRV_TIMER_EVENT_MSTART || 900 event == SNDRV_TIMER_EVENT_MCONTINUE || 901 event == SNDRV_TIMER_EVENT_MRESUME) { 902 if (timer->hw.c_resolution) 903 resolution = timer->hw.c_resolution(timer); 904 else 905 resolution = timer->hw.resolution; 906 } 907 list_for_each_entry(ti, &timer->active_list_head, active_list) { 908 if (ti->ccallback) 909 ti->ccallback(ti, event, tstamp, resolution); 910 list_for_each_entry(ts, &ti->slave_active_head, active_list) 911 if (ts->ccallback) 912 ts->ccallback(ts, event, tstamp, resolution); 913 } 914 spin_unlock_irqrestore(&timer->lock, flags); 915 } 916 917 /* 918 * exported functions for global timers 919 */ 920 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 921 { 922 struct snd_timer_id tid; 923 924 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 925 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 926 tid.card = -1; 927 tid.device = device; 928 tid.subdevice = 0; 929 return snd_timer_new(NULL, id, &tid, rtimer); 930 } 931 932 int snd_timer_global_free(struct snd_timer *timer) 933 { 934 return snd_timer_free(timer); 935 } 936 937 int snd_timer_global_register(struct snd_timer *timer) 938 { 939 struct snd_device dev; 940 941 memset(&dev, 0, sizeof(dev)); 942 dev.device_data = timer; 943 return snd_timer_dev_register(&dev); 944 } 945 946 /* 947 * System timer 948 */ 949 950 struct snd_timer_system_private { 951 struct timer_list tlist; 952 unsigned long last_expires; 953 unsigned long last_jiffies; 954 unsigned long correction; 955 }; 956 957 static void snd_timer_s_function(unsigned long data) 958 { 959 struct snd_timer *timer = (struct snd_timer *)data; 960 struct snd_timer_system_private *priv = timer->private_data; 961 unsigned long jiff = jiffies; 962 if (time_after(jiff, priv->last_expires)) 963 priv->correction += (long)jiff - (long)priv->last_expires; 964 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 965 } 966 967 static int snd_timer_s_start(struct snd_timer * timer) 968 { 969 struct snd_timer_system_private *priv; 970 unsigned long njiff; 971 972 priv = (struct snd_timer_system_private *) timer->private_data; 973 njiff = (priv->last_jiffies = jiffies); 974 if (priv->correction > timer->sticks - 1) { 975 priv->correction -= timer->sticks - 1; 976 njiff++; 977 } else { 978 njiff += timer->sticks - priv->correction; 979 priv->correction = 0; 980 } 981 priv->last_expires = priv->tlist.expires = njiff; 982 add_timer(&priv->tlist); 983 return 0; 984 } 985 986 static int snd_timer_s_stop(struct snd_timer * timer) 987 { 988 struct snd_timer_system_private *priv; 989 unsigned long jiff; 990 991 priv = (struct snd_timer_system_private *) timer->private_data; 992 del_timer(&priv->tlist); 993 jiff = jiffies; 994 if (time_before(jiff, priv->last_expires)) 995 timer->sticks = priv->last_expires - jiff; 996 else 997 timer->sticks = 1; 998 priv->correction = 0; 999 return 0; 1000 } 1001 1002 static struct snd_timer_hardware snd_timer_system = 1003 { 1004 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1005 .resolution = 1000000000L / HZ, 1006 .ticks = 10000000L, 1007 .start = snd_timer_s_start, 1008 .stop = snd_timer_s_stop 1009 }; 1010 1011 static void snd_timer_free_system(struct snd_timer *timer) 1012 { 1013 kfree(timer->private_data); 1014 } 1015 1016 static int snd_timer_register_system(void) 1017 { 1018 struct snd_timer *timer; 1019 struct snd_timer_system_private *priv; 1020 int err; 1021 1022 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1023 if (err < 0) 1024 return err; 1025 strcpy(timer->name, "system timer"); 1026 timer->hw = snd_timer_system; 1027 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1028 if (priv == NULL) { 1029 snd_timer_free(timer); 1030 return -ENOMEM; 1031 } 1032 init_timer(&priv->tlist); 1033 priv->tlist.function = snd_timer_s_function; 1034 priv->tlist.data = (unsigned long) timer; 1035 timer->private_data = priv; 1036 timer->private_free = snd_timer_free_system; 1037 return snd_timer_global_register(timer); 1038 } 1039 1040 #ifdef CONFIG_PROC_FS 1041 /* 1042 * Info interface 1043 */ 1044 1045 static void snd_timer_proc_read(struct snd_info_entry *entry, 1046 struct snd_info_buffer *buffer) 1047 { 1048 struct snd_timer *timer; 1049 struct snd_timer_instance *ti; 1050 1051 mutex_lock(®ister_mutex); 1052 list_for_each_entry(timer, &snd_timer_list, device_list) { 1053 switch (timer->tmr_class) { 1054 case SNDRV_TIMER_CLASS_GLOBAL: 1055 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1056 break; 1057 case SNDRV_TIMER_CLASS_CARD: 1058 snd_iprintf(buffer, "C%i-%i: ", 1059 timer->card->number, timer->tmr_device); 1060 break; 1061 case SNDRV_TIMER_CLASS_PCM: 1062 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1063 timer->tmr_device, timer->tmr_subdevice); 1064 break; 1065 default: 1066 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1067 timer->card ? timer->card->number : -1, 1068 timer->tmr_device, timer->tmr_subdevice); 1069 } 1070 snd_iprintf(buffer, "%s :", timer->name); 1071 if (timer->hw.resolution) 1072 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1073 timer->hw.resolution / 1000, 1074 timer->hw.resolution % 1000, 1075 timer->hw.ticks); 1076 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1077 snd_iprintf(buffer, " SLAVE"); 1078 snd_iprintf(buffer, "\n"); 1079 list_for_each_entry(ti, &timer->open_list_head, open_list) 1080 snd_iprintf(buffer, " Client %s : %s\n", 1081 ti->owner ? ti->owner : "unknown", 1082 ti->flags & (SNDRV_TIMER_IFLG_START | 1083 SNDRV_TIMER_IFLG_RUNNING) 1084 ? "running" : "stopped"); 1085 } 1086 mutex_unlock(®ister_mutex); 1087 } 1088 1089 static struct snd_info_entry *snd_timer_proc_entry; 1090 1091 static void __init snd_timer_proc_init(void) 1092 { 1093 struct snd_info_entry *entry; 1094 1095 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1096 if (entry != NULL) { 1097 entry->c.text.read = snd_timer_proc_read; 1098 if (snd_info_register(entry) < 0) { 1099 snd_info_free_entry(entry); 1100 entry = NULL; 1101 } 1102 } 1103 snd_timer_proc_entry = entry; 1104 } 1105 1106 static void __exit snd_timer_proc_done(void) 1107 { 1108 snd_info_free_entry(snd_timer_proc_entry); 1109 } 1110 #else /* !CONFIG_PROC_FS */ 1111 #define snd_timer_proc_init() 1112 #define snd_timer_proc_done() 1113 #endif 1114 1115 /* 1116 * USER SPACE interface 1117 */ 1118 1119 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1120 unsigned long resolution, 1121 unsigned long ticks) 1122 { 1123 struct snd_timer_user *tu = timeri->callback_data; 1124 struct snd_timer_read *r; 1125 int prev; 1126 1127 spin_lock(&tu->qlock); 1128 if (tu->qused > 0) { 1129 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1130 r = &tu->queue[prev]; 1131 if (r->resolution == resolution) { 1132 r->ticks += ticks; 1133 goto __wake; 1134 } 1135 } 1136 if (tu->qused >= tu->queue_size) { 1137 tu->overrun++; 1138 } else { 1139 r = &tu->queue[tu->qtail++]; 1140 tu->qtail %= tu->queue_size; 1141 r->resolution = resolution; 1142 r->ticks = ticks; 1143 tu->qused++; 1144 } 1145 __wake: 1146 spin_unlock(&tu->qlock); 1147 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1148 wake_up(&tu->qchange_sleep); 1149 } 1150 1151 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1152 struct snd_timer_tread *tread) 1153 { 1154 if (tu->qused >= tu->queue_size) { 1155 tu->overrun++; 1156 } else { 1157 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1158 tu->qtail %= tu->queue_size; 1159 tu->qused++; 1160 } 1161 } 1162 1163 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1164 int event, 1165 struct timespec *tstamp, 1166 unsigned long resolution) 1167 { 1168 struct snd_timer_user *tu = timeri->callback_data; 1169 struct snd_timer_tread r1; 1170 unsigned long flags; 1171 1172 if (event >= SNDRV_TIMER_EVENT_START && 1173 event <= SNDRV_TIMER_EVENT_PAUSE) 1174 tu->tstamp = *tstamp; 1175 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1176 return; 1177 r1.event = event; 1178 r1.tstamp = *tstamp; 1179 r1.val = resolution; 1180 spin_lock_irqsave(&tu->qlock, flags); 1181 snd_timer_user_append_to_tqueue(tu, &r1); 1182 spin_unlock_irqrestore(&tu->qlock, flags); 1183 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1184 wake_up(&tu->qchange_sleep); 1185 } 1186 1187 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1188 unsigned long resolution, 1189 unsigned long ticks) 1190 { 1191 struct snd_timer_user *tu = timeri->callback_data; 1192 struct snd_timer_tread *r, r1; 1193 struct timespec tstamp; 1194 int prev, append = 0; 1195 1196 memset(&tstamp, 0, sizeof(tstamp)); 1197 spin_lock(&tu->qlock); 1198 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1199 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1200 spin_unlock(&tu->qlock); 1201 return; 1202 } 1203 if (tu->last_resolution != resolution || ticks > 0) { 1204 if (timer_tstamp_monotonic) 1205 do_posix_clock_monotonic_gettime(&tstamp); 1206 else 1207 getnstimeofday(&tstamp); 1208 } 1209 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1210 tu->last_resolution != resolution) { 1211 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1212 r1.tstamp = tstamp; 1213 r1.val = resolution; 1214 snd_timer_user_append_to_tqueue(tu, &r1); 1215 tu->last_resolution = resolution; 1216 append++; 1217 } 1218 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1219 goto __wake; 1220 if (ticks == 0) 1221 goto __wake; 1222 if (tu->qused > 0) { 1223 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1224 r = &tu->tqueue[prev]; 1225 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1226 r->tstamp = tstamp; 1227 r->val += ticks; 1228 append++; 1229 goto __wake; 1230 } 1231 } 1232 r1.event = SNDRV_TIMER_EVENT_TICK; 1233 r1.tstamp = tstamp; 1234 r1.val = ticks; 1235 snd_timer_user_append_to_tqueue(tu, &r1); 1236 append++; 1237 __wake: 1238 spin_unlock(&tu->qlock); 1239 if (append == 0) 1240 return; 1241 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1242 wake_up(&tu->qchange_sleep); 1243 } 1244 1245 static int snd_timer_user_open(struct inode *inode, struct file *file) 1246 { 1247 struct snd_timer_user *tu; 1248 int err; 1249 1250 err = nonseekable_open(inode, file); 1251 if (err < 0) 1252 return err; 1253 1254 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1255 if (tu == NULL) 1256 return -ENOMEM; 1257 spin_lock_init(&tu->qlock); 1258 init_waitqueue_head(&tu->qchange_sleep); 1259 mutex_init(&tu->tread_sem); 1260 tu->ticks = 1; 1261 tu->queue_size = 128; 1262 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1263 GFP_KERNEL); 1264 if (tu->queue == NULL) { 1265 kfree(tu); 1266 return -ENOMEM; 1267 } 1268 file->private_data = tu; 1269 return 0; 1270 } 1271 1272 static int snd_timer_user_release(struct inode *inode, struct file *file) 1273 { 1274 struct snd_timer_user *tu; 1275 1276 if (file->private_data) { 1277 tu = file->private_data; 1278 file->private_data = NULL; 1279 if (tu->timeri) 1280 snd_timer_close(tu->timeri); 1281 kfree(tu->queue); 1282 kfree(tu->tqueue); 1283 kfree(tu); 1284 } 1285 return 0; 1286 } 1287 1288 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1289 { 1290 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1291 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1292 id->card = -1; 1293 id->device = -1; 1294 id->subdevice = -1; 1295 } 1296 1297 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1298 { 1299 id->dev_class = timer->tmr_class; 1300 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1301 id->card = timer->card ? timer->card->number : -1; 1302 id->device = timer->tmr_device; 1303 id->subdevice = timer->tmr_subdevice; 1304 } 1305 1306 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1307 { 1308 struct snd_timer_id id; 1309 struct snd_timer *timer; 1310 struct list_head *p; 1311 1312 if (copy_from_user(&id, _tid, sizeof(id))) 1313 return -EFAULT; 1314 mutex_lock(®ister_mutex); 1315 if (id.dev_class < 0) { /* first item */ 1316 if (list_empty(&snd_timer_list)) 1317 snd_timer_user_zero_id(&id); 1318 else { 1319 timer = list_entry(snd_timer_list.next, 1320 struct snd_timer, device_list); 1321 snd_timer_user_copy_id(&id, timer); 1322 } 1323 } else { 1324 switch (id.dev_class) { 1325 case SNDRV_TIMER_CLASS_GLOBAL: 1326 id.device = id.device < 0 ? 0 : id.device + 1; 1327 list_for_each(p, &snd_timer_list) { 1328 timer = list_entry(p, struct snd_timer, device_list); 1329 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1330 snd_timer_user_copy_id(&id, timer); 1331 break; 1332 } 1333 if (timer->tmr_device >= id.device) { 1334 snd_timer_user_copy_id(&id, timer); 1335 break; 1336 } 1337 } 1338 if (p == &snd_timer_list) 1339 snd_timer_user_zero_id(&id); 1340 break; 1341 case SNDRV_TIMER_CLASS_CARD: 1342 case SNDRV_TIMER_CLASS_PCM: 1343 if (id.card < 0) { 1344 id.card = 0; 1345 } else { 1346 if (id.card < 0) { 1347 id.card = 0; 1348 } else { 1349 if (id.device < 0) { 1350 id.device = 0; 1351 } else { 1352 if (id.subdevice < 0) { 1353 id.subdevice = 0; 1354 } else { 1355 id.subdevice++; 1356 } 1357 } 1358 } 1359 } 1360 list_for_each(p, &snd_timer_list) { 1361 timer = list_entry(p, struct snd_timer, device_list); 1362 if (timer->tmr_class > id.dev_class) { 1363 snd_timer_user_copy_id(&id, timer); 1364 break; 1365 } 1366 if (timer->tmr_class < id.dev_class) 1367 continue; 1368 if (timer->card->number > id.card) { 1369 snd_timer_user_copy_id(&id, timer); 1370 break; 1371 } 1372 if (timer->card->number < id.card) 1373 continue; 1374 if (timer->tmr_device > id.device) { 1375 snd_timer_user_copy_id(&id, timer); 1376 break; 1377 } 1378 if (timer->tmr_device < id.device) 1379 continue; 1380 if (timer->tmr_subdevice > id.subdevice) { 1381 snd_timer_user_copy_id(&id, timer); 1382 break; 1383 } 1384 if (timer->tmr_subdevice < id.subdevice) 1385 continue; 1386 snd_timer_user_copy_id(&id, timer); 1387 break; 1388 } 1389 if (p == &snd_timer_list) 1390 snd_timer_user_zero_id(&id); 1391 break; 1392 default: 1393 snd_timer_user_zero_id(&id); 1394 } 1395 } 1396 mutex_unlock(®ister_mutex); 1397 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1398 return -EFAULT; 1399 return 0; 1400 } 1401 1402 static int snd_timer_user_ginfo(struct file *file, 1403 struct snd_timer_ginfo __user *_ginfo) 1404 { 1405 struct snd_timer_ginfo *ginfo; 1406 struct snd_timer_id tid; 1407 struct snd_timer *t; 1408 struct list_head *p; 1409 int err = 0; 1410 1411 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1412 if (IS_ERR(ginfo)) 1413 return PTR_ERR(ginfo); 1414 1415 tid = ginfo->tid; 1416 memset(ginfo, 0, sizeof(*ginfo)); 1417 ginfo->tid = tid; 1418 mutex_lock(®ister_mutex); 1419 t = snd_timer_find(&tid); 1420 if (t != NULL) { 1421 ginfo->card = t->card ? t->card->number : -1; 1422 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1423 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1424 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1425 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1426 ginfo->resolution = t->hw.resolution; 1427 if (t->hw.resolution_min > 0) { 1428 ginfo->resolution_min = t->hw.resolution_min; 1429 ginfo->resolution_max = t->hw.resolution_max; 1430 } 1431 list_for_each(p, &t->open_list_head) { 1432 ginfo->clients++; 1433 } 1434 } else { 1435 err = -ENODEV; 1436 } 1437 mutex_unlock(®ister_mutex); 1438 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1439 err = -EFAULT; 1440 kfree(ginfo); 1441 return err; 1442 } 1443 1444 static int snd_timer_user_gparams(struct file *file, 1445 struct snd_timer_gparams __user *_gparams) 1446 { 1447 struct snd_timer_gparams gparams; 1448 struct snd_timer *t; 1449 int err; 1450 1451 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1452 return -EFAULT; 1453 mutex_lock(®ister_mutex); 1454 t = snd_timer_find(&gparams.tid); 1455 if (!t) { 1456 err = -ENODEV; 1457 goto _error; 1458 } 1459 if (!list_empty(&t->open_list_head)) { 1460 err = -EBUSY; 1461 goto _error; 1462 } 1463 if (!t->hw.set_period) { 1464 err = -ENOSYS; 1465 goto _error; 1466 } 1467 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1468 _error: 1469 mutex_unlock(®ister_mutex); 1470 return err; 1471 } 1472 1473 static int snd_timer_user_gstatus(struct file *file, 1474 struct snd_timer_gstatus __user *_gstatus) 1475 { 1476 struct snd_timer_gstatus gstatus; 1477 struct snd_timer_id tid; 1478 struct snd_timer *t; 1479 int err = 0; 1480 1481 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1482 return -EFAULT; 1483 tid = gstatus.tid; 1484 memset(&gstatus, 0, sizeof(gstatus)); 1485 gstatus.tid = tid; 1486 mutex_lock(®ister_mutex); 1487 t = snd_timer_find(&tid); 1488 if (t != NULL) { 1489 if (t->hw.c_resolution) 1490 gstatus.resolution = t->hw.c_resolution(t); 1491 else 1492 gstatus.resolution = t->hw.resolution; 1493 if (t->hw.precise_resolution) { 1494 t->hw.precise_resolution(t, &gstatus.resolution_num, 1495 &gstatus.resolution_den); 1496 } else { 1497 gstatus.resolution_num = gstatus.resolution; 1498 gstatus.resolution_den = 1000000000uL; 1499 } 1500 } else { 1501 err = -ENODEV; 1502 } 1503 mutex_unlock(®ister_mutex); 1504 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1505 err = -EFAULT; 1506 return err; 1507 } 1508 1509 static int snd_timer_user_tselect(struct file *file, 1510 struct snd_timer_select __user *_tselect) 1511 { 1512 struct snd_timer_user *tu; 1513 struct snd_timer_select tselect; 1514 char str[32]; 1515 int err = 0; 1516 1517 tu = file->private_data; 1518 mutex_lock(&tu->tread_sem); 1519 if (tu->timeri) { 1520 snd_timer_close(tu->timeri); 1521 tu->timeri = NULL; 1522 } 1523 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1524 err = -EFAULT; 1525 goto __err; 1526 } 1527 sprintf(str, "application %i", current->pid); 1528 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1529 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1530 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1531 if (err < 0) 1532 goto __err; 1533 1534 kfree(tu->queue); 1535 tu->queue = NULL; 1536 kfree(tu->tqueue); 1537 tu->tqueue = NULL; 1538 if (tu->tread) { 1539 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1540 GFP_KERNEL); 1541 if (tu->tqueue == NULL) 1542 err = -ENOMEM; 1543 } else { 1544 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1545 GFP_KERNEL); 1546 if (tu->queue == NULL) 1547 err = -ENOMEM; 1548 } 1549 1550 if (err < 0) { 1551 snd_timer_close(tu->timeri); 1552 tu->timeri = NULL; 1553 } else { 1554 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1555 tu->timeri->callback = tu->tread 1556 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1557 tu->timeri->ccallback = snd_timer_user_ccallback; 1558 tu->timeri->callback_data = (void *)tu; 1559 } 1560 1561 __err: 1562 mutex_unlock(&tu->tread_sem); 1563 return err; 1564 } 1565 1566 static int snd_timer_user_info(struct file *file, 1567 struct snd_timer_info __user *_info) 1568 { 1569 struct snd_timer_user *tu; 1570 struct snd_timer_info *info; 1571 struct snd_timer *t; 1572 int err = 0; 1573 1574 tu = file->private_data; 1575 if (!tu->timeri) 1576 return -EBADFD; 1577 t = tu->timeri->timer; 1578 if (!t) 1579 return -EBADFD; 1580 1581 info = kzalloc(sizeof(*info), GFP_KERNEL); 1582 if (! info) 1583 return -ENOMEM; 1584 info->card = t->card ? t->card->number : -1; 1585 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1586 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1587 strlcpy(info->id, t->id, sizeof(info->id)); 1588 strlcpy(info->name, t->name, sizeof(info->name)); 1589 info->resolution = t->hw.resolution; 1590 if (copy_to_user(_info, info, sizeof(*_info))) 1591 err = -EFAULT; 1592 kfree(info); 1593 return err; 1594 } 1595 1596 static int snd_timer_user_params(struct file *file, 1597 struct snd_timer_params __user *_params) 1598 { 1599 struct snd_timer_user *tu; 1600 struct snd_timer_params params; 1601 struct snd_timer *t; 1602 struct snd_timer_read *tr; 1603 struct snd_timer_tread *ttr; 1604 int err; 1605 1606 tu = file->private_data; 1607 if (!tu->timeri) 1608 return -EBADFD; 1609 t = tu->timeri->timer; 1610 if (!t) 1611 return -EBADFD; 1612 if (copy_from_user(¶ms, _params, sizeof(params))) 1613 return -EFAULT; 1614 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1615 err = -EINVAL; 1616 goto _end; 1617 } 1618 if (params.queue_size > 0 && 1619 (params.queue_size < 32 || params.queue_size > 1024)) { 1620 err = -EINVAL; 1621 goto _end; 1622 } 1623 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1624 (1<<SNDRV_TIMER_EVENT_TICK)| 1625 (1<<SNDRV_TIMER_EVENT_START)| 1626 (1<<SNDRV_TIMER_EVENT_STOP)| 1627 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1628 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1629 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1630 (1<<SNDRV_TIMER_EVENT_RESUME)| 1631 (1<<SNDRV_TIMER_EVENT_MSTART)| 1632 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1633 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1634 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1635 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1636 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1637 err = -EINVAL; 1638 goto _end; 1639 } 1640 snd_timer_stop(tu->timeri); 1641 spin_lock_irq(&t->lock); 1642 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1643 SNDRV_TIMER_IFLG_EXCLUSIVE| 1644 SNDRV_TIMER_IFLG_EARLY_EVENT); 1645 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1646 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1647 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1648 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1649 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1650 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1651 spin_unlock_irq(&t->lock); 1652 if (params.queue_size > 0 && 1653 (unsigned int)tu->queue_size != params.queue_size) { 1654 if (tu->tread) { 1655 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1656 GFP_KERNEL); 1657 if (ttr) { 1658 kfree(tu->tqueue); 1659 tu->queue_size = params.queue_size; 1660 tu->tqueue = ttr; 1661 } 1662 } else { 1663 tr = kmalloc(params.queue_size * sizeof(*tr), 1664 GFP_KERNEL); 1665 if (tr) { 1666 kfree(tu->queue); 1667 tu->queue_size = params.queue_size; 1668 tu->queue = tr; 1669 } 1670 } 1671 } 1672 tu->qhead = tu->qtail = tu->qused = 0; 1673 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1674 if (tu->tread) { 1675 struct snd_timer_tread tread; 1676 tread.event = SNDRV_TIMER_EVENT_EARLY; 1677 tread.tstamp.tv_sec = 0; 1678 tread.tstamp.tv_nsec = 0; 1679 tread.val = 0; 1680 snd_timer_user_append_to_tqueue(tu, &tread); 1681 } else { 1682 struct snd_timer_read *r = &tu->queue[0]; 1683 r->resolution = 0; 1684 r->ticks = 0; 1685 tu->qused++; 1686 tu->qtail++; 1687 } 1688 } 1689 tu->filter = params.filter; 1690 tu->ticks = params.ticks; 1691 err = 0; 1692 _end: 1693 if (copy_to_user(_params, ¶ms, sizeof(params))) 1694 return -EFAULT; 1695 return err; 1696 } 1697 1698 static int snd_timer_user_status(struct file *file, 1699 struct snd_timer_status __user *_status) 1700 { 1701 struct snd_timer_user *tu; 1702 struct snd_timer_status status; 1703 1704 tu = file->private_data; 1705 if (!tu->timeri) 1706 return -EBADFD; 1707 memset(&status, 0, sizeof(status)); 1708 status.tstamp = tu->tstamp; 1709 status.resolution = snd_timer_resolution(tu->timeri); 1710 status.lost = tu->timeri->lost; 1711 status.overrun = tu->overrun; 1712 spin_lock_irq(&tu->qlock); 1713 status.queue = tu->qused; 1714 spin_unlock_irq(&tu->qlock); 1715 if (copy_to_user(_status, &status, sizeof(status))) 1716 return -EFAULT; 1717 return 0; 1718 } 1719 1720 static int snd_timer_user_start(struct file *file) 1721 { 1722 int err; 1723 struct snd_timer_user *tu; 1724 1725 tu = file->private_data; 1726 if (!tu->timeri) 1727 return -EBADFD; 1728 snd_timer_stop(tu->timeri); 1729 tu->timeri->lost = 0; 1730 tu->last_resolution = 0; 1731 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1732 } 1733 1734 static int snd_timer_user_stop(struct file *file) 1735 { 1736 int err; 1737 struct snd_timer_user *tu; 1738 1739 tu = file->private_data; 1740 if (!tu->timeri) 1741 return -EBADFD; 1742 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1743 } 1744 1745 static int snd_timer_user_continue(struct file *file) 1746 { 1747 int err; 1748 struct snd_timer_user *tu; 1749 1750 tu = file->private_data; 1751 if (!tu->timeri) 1752 return -EBADFD; 1753 tu->timeri->lost = 0; 1754 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1755 } 1756 1757 static int snd_timer_user_pause(struct file *file) 1758 { 1759 int err; 1760 struct snd_timer_user *tu; 1761 1762 tu = file->private_data; 1763 if (!tu->timeri) 1764 return -EBADFD; 1765 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1766 } 1767 1768 enum { 1769 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1770 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1771 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1772 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1773 }; 1774 1775 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1776 unsigned long arg) 1777 { 1778 struct snd_timer_user *tu; 1779 void __user *argp = (void __user *)arg; 1780 int __user *p = argp; 1781 1782 tu = file->private_data; 1783 switch (cmd) { 1784 case SNDRV_TIMER_IOCTL_PVERSION: 1785 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1786 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1787 return snd_timer_user_next_device(argp); 1788 case SNDRV_TIMER_IOCTL_TREAD: 1789 { 1790 int xarg; 1791 1792 mutex_lock(&tu->tread_sem); 1793 if (tu->timeri) { /* too late */ 1794 mutex_unlock(&tu->tread_sem); 1795 return -EBUSY; 1796 } 1797 if (get_user(xarg, p)) { 1798 mutex_unlock(&tu->tread_sem); 1799 return -EFAULT; 1800 } 1801 tu->tread = xarg ? 1 : 0; 1802 mutex_unlock(&tu->tread_sem); 1803 return 0; 1804 } 1805 case SNDRV_TIMER_IOCTL_GINFO: 1806 return snd_timer_user_ginfo(file, argp); 1807 case SNDRV_TIMER_IOCTL_GPARAMS: 1808 return snd_timer_user_gparams(file, argp); 1809 case SNDRV_TIMER_IOCTL_GSTATUS: 1810 return snd_timer_user_gstatus(file, argp); 1811 case SNDRV_TIMER_IOCTL_SELECT: 1812 return snd_timer_user_tselect(file, argp); 1813 case SNDRV_TIMER_IOCTL_INFO: 1814 return snd_timer_user_info(file, argp); 1815 case SNDRV_TIMER_IOCTL_PARAMS: 1816 return snd_timer_user_params(file, argp); 1817 case SNDRV_TIMER_IOCTL_STATUS: 1818 return snd_timer_user_status(file, argp); 1819 case SNDRV_TIMER_IOCTL_START: 1820 case SNDRV_TIMER_IOCTL_START_OLD: 1821 return snd_timer_user_start(file); 1822 case SNDRV_TIMER_IOCTL_STOP: 1823 case SNDRV_TIMER_IOCTL_STOP_OLD: 1824 return snd_timer_user_stop(file); 1825 case SNDRV_TIMER_IOCTL_CONTINUE: 1826 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1827 return snd_timer_user_continue(file); 1828 case SNDRV_TIMER_IOCTL_PAUSE: 1829 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1830 return snd_timer_user_pause(file); 1831 } 1832 return -ENOTTY; 1833 } 1834 1835 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1836 { 1837 struct snd_timer_user *tu; 1838 1839 tu = file->private_data; 1840 return fasync_helper(fd, file, on, &tu->fasync); 1841 } 1842 1843 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1844 size_t count, loff_t *offset) 1845 { 1846 struct snd_timer_user *tu; 1847 long result = 0, unit; 1848 int err = 0; 1849 1850 tu = file->private_data; 1851 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1852 spin_lock_irq(&tu->qlock); 1853 while ((long)count - result >= unit) { 1854 while (!tu->qused) { 1855 wait_queue_t wait; 1856 1857 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1858 err = -EAGAIN; 1859 break; 1860 } 1861 1862 set_current_state(TASK_INTERRUPTIBLE); 1863 init_waitqueue_entry(&wait, current); 1864 add_wait_queue(&tu->qchange_sleep, &wait); 1865 1866 spin_unlock_irq(&tu->qlock); 1867 schedule(); 1868 spin_lock_irq(&tu->qlock); 1869 1870 remove_wait_queue(&tu->qchange_sleep, &wait); 1871 1872 if (signal_pending(current)) { 1873 err = -ERESTARTSYS; 1874 break; 1875 } 1876 } 1877 1878 spin_unlock_irq(&tu->qlock); 1879 if (err < 0) 1880 goto _error; 1881 1882 if (tu->tread) { 1883 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1884 sizeof(struct snd_timer_tread))) { 1885 err = -EFAULT; 1886 goto _error; 1887 } 1888 } else { 1889 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1890 sizeof(struct snd_timer_read))) { 1891 err = -EFAULT; 1892 goto _error; 1893 } 1894 } 1895 1896 tu->qhead %= tu->queue_size; 1897 1898 result += unit; 1899 buffer += unit; 1900 1901 spin_lock_irq(&tu->qlock); 1902 tu->qused--; 1903 } 1904 spin_unlock_irq(&tu->qlock); 1905 _error: 1906 return result > 0 ? result : err; 1907 } 1908 1909 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1910 { 1911 unsigned int mask; 1912 struct snd_timer_user *tu; 1913 1914 tu = file->private_data; 1915 1916 poll_wait(file, &tu->qchange_sleep, wait); 1917 1918 mask = 0; 1919 if (tu->qused) 1920 mask |= POLLIN | POLLRDNORM; 1921 1922 return mask; 1923 } 1924 1925 #ifdef CONFIG_COMPAT 1926 #include "timer_compat.c" 1927 #else 1928 #define snd_timer_user_ioctl_compat NULL 1929 #endif 1930 1931 static const struct file_operations snd_timer_f_ops = 1932 { 1933 .owner = THIS_MODULE, 1934 .read = snd_timer_user_read, 1935 .open = snd_timer_user_open, 1936 .release = snd_timer_user_release, 1937 .llseek = no_llseek, 1938 .poll = snd_timer_user_poll, 1939 .unlocked_ioctl = snd_timer_user_ioctl, 1940 .compat_ioctl = snd_timer_user_ioctl_compat, 1941 .fasync = snd_timer_user_fasync, 1942 }; 1943 1944 /* 1945 * ENTRY functions 1946 */ 1947 1948 static int __init alsa_timer_init(void) 1949 { 1950 int err; 1951 1952 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1953 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 1954 "system timer"); 1955 #endif 1956 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, NULL, 0, 1961 &snd_timer_f_ops, NULL, "timer")) < 0) 1962 snd_printk(KERN_ERR "unable to register timer device (%i)\n", 1963 err); 1964 snd_timer_proc_init(); 1965 return 0; 1966 } 1967 1968 static void __exit alsa_timer_exit(void) 1969 { 1970 struct list_head *p, *n; 1971 1972 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 1973 /* unregister the system timer */ 1974 list_for_each_safe(p, n, &snd_timer_list) { 1975 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list); 1976 snd_timer_free(timer); 1977 } 1978 snd_timer_proc_done(); 1979 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1980 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1981 #endif 1982 } 1983 1984 module_init(alsa_timer_init) 1985 module_exit(alsa_timer_exit) 1986 1987 EXPORT_SYMBOL(snd_timer_open); 1988 EXPORT_SYMBOL(snd_timer_close); 1989 EXPORT_SYMBOL(snd_timer_resolution); 1990 EXPORT_SYMBOL(snd_timer_start); 1991 EXPORT_SYMBOL(snd_timer_stop); 1992 EXPORT_SYMBOL(snd_timer_continue); 1993 EXPORT_SYMBOL(snd_timer_pause); 1994 EXPORT_SYMBOL(snd_timer_new); 1995 EXPORT_SYMBOL(snd_timer_notify); 1996 EXPORT_SYMBOL(snd_timer_global_new); 1997 EXPORT_SYMBOL(snd_timer_global_free); 1998 EXPORT_SYMBOL(snd_timer_global_register); 1999 EXPORT_SYMBOL(snd_timer_interrupt); 2000