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