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/moduleparam.h> 28 #include <linux/string.h> 29 #include <sound/core.h> 30 #include <sound/timer.h> 31 #include <sound/control.h> 32 #include <sound/info.h> 33 #include <sound/minors.h> 34 #include <sound/initval.h> 35 #include <linux/kmod.h> 36 37 #if defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE) 38 #define DEFAULT_TIMER_LIMIT 4 39 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE) 40 #define DEFAULT_TIMER_LIMIT 2 41 #else 42 #define DEFAULT_TIMER_LIMIT 1 43 #endif 44 45 static int timer_limit = DEFAULT_TIMER_LIMIT; 46 static int timer_tstamp_monotonic = 1; 47 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); 48 MODULE_DESCRIPTION("ALSA timer interface"); 49 MODULE_LICENSE("GPL"); 50 module_param(timer_limit, int, 0444); 51 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 52 module_param(timer_tstamp_monotonic, int, 0444); 53 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); 54 55 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); 56 MODULE_ALIAS("devname:snd/timer"); 57 58 struct snd_timer_user { 59 struct snd_timer_instance *timeri; 60 int tread; /* enhanced read with timestamps and events */ 61 unsigned long ticks; 62 unsigned long overrun; 63 int qhead; 64 int qtail; 65 int qused; 66 int queue_size; 67 struct snd_timer_read *queue; 68 struct snd_timer_tread *tqueue; 69 spinlock_t qlock; 70 unsigned long last_resolution; 71 unsigned int filter; 72 struct timespec tstamp; /* trigger tstamp */ 73 wait_queue_head_t qchange_sleep; 74 struct fasync_struct *fasync; 75 struct mutex tread_sem; 76 }; 77 78 /* list of timers */ 79 static LIST_HEAD(snd_timer_list); 80 81 /* list of slave instances */ 82 static LIST_HEAD(snd_timer_slave_list); 83 84 /* lock for slave active lists */ 85 static DEFINE_SPINLOCK(slave_active_lock); 86 87 static DEFINE_MUTEX(register_mutex); 88 89 static int snd_timer_free(struct snd_timer *timer); 90 static int snd_timer_dev_free(struct snd_device *device); 91 static int snd_timer_dev_register(struct snd_device *device); 92 static int snd_timer_dev_disconnect(struct snd_device *device); 93 94 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 95 96 /* 97 * create a timer instance with the given owner string. 98 * when timer is not NULL, increments the module counter 99 */ 100 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 101 struct snd_timer *timer) 102 { 103 struct snd_timer_instance *timeri; 104 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 105 if (timeri == NULL) 106 return NULL; 107 timeri->owner = kstrdup(owner, GFP_KERNEL); 108 if (! timeri->owner) { 109 kfree(timeri); 110 return NULL; 111 } 112 INIT_LIST_HEAD(&timeri->open_list); 113 INIT_LIST_HEAD(&timeri->active_list); 114 INIT_LIST_HEAD(&timeri->ack_list); 115 INIT_LIST_HEAD(&timeri->slave_list_head); 116 INIT_LIST_HEAD(&timeri->slave_active_head); 117 118 timeri->timer = timer; 119 if (timer && !try_module_get(timer->module)) { 120 kfree(timeri->owner); 121 kfree(timeri); 122 return NULL; 123 } 124 125 return timeri; 126 } 127 128 /* 129 * find a timer instance from the given timer id 130 */ 131 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 132 { 133 struct snd_timer *timer = NULL; 134 135 list_for_each_entry(timer, &snd_timer_list, device_list) { 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_MODULES 153 154 static void snd_timer_request(struct snd_timer_id *tid) 155 { 156 switch (tid->dev_class) { 157 case SNDRV_TIMER_CLASS_GLOBAL: 158 if (tid->device < timer_limit) 159 request_module("snd-timer-%i", tid->device); 160 break; 161 case SNDRV_TIMER_CLASS_CARD: 162 case SNDRV_TIMER_CLASS_PCM: 163 if (tid->card < snd_ecards_limit) 164 request_module("snd-card-%i", tid->card); 165 break; 166 default: 167 break; 168 } 169 } 170 171 #endif 172 173 /* 174 * look for a master instance matching with the slave id of the given slave. 175 * when found, relink the open_link of the slave. 176 * 177 * call this with register_mutex down. 178 */ 179 static void snd_timer_check_slave(struct snd_timer_instance *slave) 180 { 181 struct snd_timer *timer; 182 struct snd_timer_instance *master; 183 184 /* FIXME: it's really dumb to look up all entries.. */ 185 list_for_each_entry(timer, &snd_timer_list, device_list) { 186 list_for_each_entry(master, &timer->open_list_head, open_list) { 187 if (slave->slave_class == master->slave_class && 188 slave->slave_id == master->slave_id) { 189 list_move_tail(&slave->open_list, 190 &master->slave_list_head); 191 spin_lock_irq(&slave_active_lock); 192 slave->master = master; 193 slave->timer = master->timer; 194 spin_unlock_irq(&slave_active_lock); 195 return; 196 } 197 } 198 } 199 } 200 201 /* 202 * look for slave instances matching with the slave id of the given master. 203 * when found, relink the open_link of slaves. 204 * 205 * call this with register_mutex down. 206 */ 207 static void snd_timer_check_master(struct snd_timer_instance *master) 208 { 209 struct snd_timer_instance *slave, *tmp; 210 211 /* check all pending slaves */ 212 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 213 if (slave->slave_class == master->slave_class && 214 slave->slave_id == master->slave_id) { 215 list_move_tail(&slave->open_list, &master->slave_list_head); 216 spin_lock_irq(&slave_active_lock); 217 slave->master = master; 218 slave->timer = master->timer; 219 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 220 list_add_tail(&slave->active_list, 221 &master->slave_active_head); 222 spin_unlock_irq(&slave_active_lock); 223 } 224 } 225 } 226 227 /* 228 * open a timer instance 229 * when opening a master, the slave id must be here given. 230 */ 231 int snd_timer_open(struct snd_timer_instance **ti, 232 char *owner, struct snd_timer_id *tid, 233 unsigned int slave_id) 234 { 235 struct snd_timer *timer; 236 struct snd_timer_instance *timeri = NULL; 237 238 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 239 /* open a slave instance */ 240 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 241 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 242 snd_printd("invalid slave class %i\n", tid->dev_sclass); 243 return -EINVAL; 244 } 245 mutex_lock(®ister_mutex); 246 timeri = snd_timer_instance_new(owner, NULL); 247 if (!timeri) { 248 mutex_unlock(®ister_mutex); 249 return -ENOMEM; 250 } 251 timeri->slave_class = tid->dev_sclass; 252 timeri->slave_id = tid->device; 253 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 254 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 255 snd_timer_check_slave(timeri); 256 mutex_unlock(®ister_mutex); 257 *ti = timeri; 258 return 0; 259 } 260 261 /* open a master instance */ 262 mutex_lock(®ister_mutex); 263 timer = snd_timer_find(tid); 264 #ifdef CONFIG_MODULES 265 if (!timer) { 266 mutex_unlock(®ister_mutex); 267 snd_timer_request(tid); 268 mutex_lock(®ister_mutex); 269 timer = snd_timer_find(tid); 270 } 271 #endif 272 if (!timer) { 273 mutex_unlock(®ister_mutex); 274 return -ENODEV; 275 } 276 if (!list_empty(&timer->open_list_head)) { 277 timeri = list_entry(timer->open_list_head.next, 278 struct snd_timer_instance, open_list); 279 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 280 mutex_unlock(®ister_mutex); 281 return -EBUSY; 282 } 283 } 284 timeri = snd_timer_instance_new(owner, timer); 285 if (!timeri) { 286 mutex_unlock(®ister_mutex); 287 return -ENOMEM; 288 } 289 timeri->slave_class = tid->dev_sclass; 290 timeri->slave_id = slave_id; 291 if (list_empty(&timer->open_list_head) && timer->hw.open) 292 timer->hw.open(timer); 293 list_add_tail(&timeri->open_list, &timer->open_list_head); 294 snd_timer_check_master(timeri); 295 mutex_unlock(®ister_mutex); 296 *ti = timeri; 297 return 0; 298 } 299 300 static int _snd_timer_stop(struct snd_timer_instance *timeri, 301 int keep_flag, int event); 302 303 /* 304 * close a timer instance 305 */ 306 int snd_timer_close(struct snd_timer_instance *timeri) 307 { 308 struct snd_timer *timer = NULL; 309 struct snd_timer_instance *slave, *tmp; 310 311 if (snd_BUG_ON(!timeri)) 312 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 mutex_lock(®ister_mutex); 327 list_del(&timeri->open_list); 328 mutex_unlock(®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 mutex_lock(®ister_mutex); 340 list_del(&timeri->open_list); 341 if (timer && list_empty(&timer->open_list_head) && 342 timer->hw.close) 343 timer->hw.close(timer); 344 /* remove slave links */ 345 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 346 open_list) { 347 spin_lock_irq(&slave_active_lock); 348 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); 349 list_move_tail(&slave->open_list, &snd_timer_slave_list); 350 slave->master = NULL; 351 slave->timer = NULL; 352 spin_unlock_irq(&slave_active_lock); 353 } 354 mutex_unlock(®ister_mutex); 355 } 356 if (timeri->private_free) 357 timeri->private_free(timeri); 358 kfree(timeri->owner); 359 kfree(timeri); 360 if (timer) 361 module_put(timer->module); 362 return 0; 363 } 364 365 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 366 { 367 struct snd_timer * 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(struct snd_timer_instance *ti, int event) 380 { 381 struct snd_timer *timer; 382 unsigned long flags; 383 unsigned long resolution = 0; 384 struct snd_timer_instance *ts; 385 struct timespec tstamp; 386 387 if (timer_tstamp_monotonic) 388 do_posix_clock_monotonic_gettime(&tstamp); 389 else 390 getnstimeofday(&tstamp); 391 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 392 event > SNDRV_TIMER_EVENT_PAUSE)) 393 return; 394 if (event == SNDRV_TIMER_EVENT_START || 395 event == SNDRV_TIMER_EVENT_CONTINUE) 396 resolution = snd_timer_resolution(ti); 397 if (ti->ccallback) 398 ti->ccallback(ti, event, &tstamp, resolution); 399 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 400 return; 401 timer = ti->timer; 402 if (timer == NULL) 403 return; 404 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 405 return; 406 spin_lock_irqsave(&timer->lock, flags); 407 list_for_each_entry(ts, &ti->slave_active_head, active_list) 408 if (ts->ccallback) 409 ts->ccallback(ti, event + 100, &tstamp, resolution); 410 spin_unlock_irqrestore(&timer->lock, flags); 411 } 412 413 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 414 unsigned long sticks) 415 { 416 list_move_tail(&timeri->active_list, &timer->active_list_head); 417 if (timer->running) { 418 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 419 goto __start_now; 420 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 421 timeri->flags |= SNDRV_TIMER_IFLG_START; 422 return 1; /* delayed start */ 423 } else { 424 timer->sticks = sticks; 425 timer->hw.start(timer); 426 __start_now: 427 timer->running++; 428 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 429 return 0; 430 } 431 } 432 433 static int snd_timer_start_slave(struct snd_timer_instance *timeri) 434 { 435 unsigned long flags; 436 437 spin_lock_irqsave(&slave_active_lock, flags); 438 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 439 if (timeri->master) 440 list_add_tail(&timeri->active_list, 441 &timeri->master->slave_active_head); 442 spin_unlock_irqrestore(&slave_active_lock, flags); 443 return 1; /* delayed start */ 444 } 445 446 /* 447 * start the timer instance 448 */ 449 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 450 { 451 struct snd_timer *timer; 452 int result = -EINVAL; 453 unsigned long flags; 454 455 if (timeri == NULL || ticks < 1) 456 return -EINVAL; 457 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 458 result = snd_timer_start_slave(timeri); 459 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 460 return result; 461 } 462 timer = timeri->timer; 463 if (timer == NULL) 464 return -EINVAL; 465 spin_lock_irqsave(&timer->lock, flags); 466 timeri->ticks = timeri->cticks = ticks; 467 timeri->pticks = 0; 468 result = snd_timer_start1(timer, timeri, ticks); 469 spin_unlock_irqrestore(&timer->lock, flags); 470 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 471 return result; 472 } 473 474 static int _snd_timer_stop(struct snd_timer_instance * timeri, 475 int keep_flag, int event) 476 { 477 struct snd_timer *timer; 478 unsigned long flags; 479 480 if (snd_BUG_ON(!timeri)) 481 return -ENXIO; 482 483 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 484 if (!keep_flag) { 485 spin_lock_irqsave(&slave_active_lock, flags); 486 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 487 spin_unlock_irqrestore(&slave_active_lock, flags); 488 } 489 goto __end; 490 } 491 timer = timeri->timer; 492 if (!timer) 493 return -EINVAL; 494 spin_lock_irqsave(&timer->lock, flags); 495 list_del_init(&timeri->ack_list); 496 list_del_init(&timeri->active_list); 497 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 498 !(--timer->running)) { 499 timer->hw.stop(timer); 500 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 501 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 502 snd_timer_reschedule(timer, 0); 503 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 504 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 505 timer->hw.start(timer); 506 } 507 } 508 } 509 if (!keep_flag) 510 timeri->flags &= 511 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 512 spin_unlock_irqrestore(&timer->lock, flags); 513 __end: 514 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 515 snd_timer_notify1(timeri, event); 516 return 0; 517 } 518 519 /* 520 * stop the timer instance. 521 * 522 * do not call this from the timer callback! 523 */ 524 int snd_timer_stop(struct snd_timer_instance *timeri) 525 { 526 struct snd_timer *timer; 527 unsigned long flags; 528 int err; 529 530 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); 531 if (err < 0) 532 return err; 533 timer = timeri->timer; 534 spin_lock_irqsave(&timer->lock, flags); 535 timeri->cticks = timeri->ticks; 536 timeri->pticks = 0; 537 spin_unlock_irqrestore(&timer->lock, flags); 538 return 0; 539 } 540 541 /* 542 * start again.. the tick is kept. 543 */ 544 int snd_timer_continue(struct snd_timer_instance *timeri) 545 { 546 struct snd_timer *timer; 547 int result = -EINVAL; 548 unsigned long flags; 549 550 if (timeri == NULL) 551 return result; 552 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 553 return snd_timer_start_slave(timeri); 554 timer = timeri->timer; 555 if (! timer) 556 return -EINVAL; 557 spin_lock_irqsave(&timer->lock, flags); 558 if (!timeri->cticks) 559 timeri->cticks = 1; 560 timeri->pticks = 0; 561 result = snd_timer_start1(timer, timeri, timer->sticks); 562 spin_unlock_irqrestore(&timer->lock, flags); 563 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 564 return result; 565 } 566 567 /* 568 * pause.. remember the ticks left 569 */ 570 int snd_timer_pause(struct snd_timer_instance * timeri) 571 { 572 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); 573 } 574 575 /* 576 * reschedule the timer 577 * 578 * start pending instances and check the scheduling ticks. 579 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 580 */ 581 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 582 { 583 struct snd_timer_instance *ti; 584 unsigned long ticks = ~0UL; 585 586 list_for_each_entry(ti, &timer->active_list_head, active_list) { 587 if (ti->flags & SNDRV_TIMER_IFLG_START) { 588 ti->flags &= ~SNDRV_TIMER_IFLG_START; 589 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 590 timer->running++; 591 } 592 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 593 if (ticks > ti->cticks) 594 ticks = ti->cticks; 595 } 596 } 597 if (ticks == ~0UL) { 598 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 599 return; 600 } 601 if (ticks > timer->hw.ticks) 602 ticks = timer->hw.ticks; 603 if (ticks_left != ticks) 604 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 605 timer->sticks = ticks; 606 } 607 608 /* 609 * timer tasklet 610 * 611 */ 612 static void snd_timer_tasklet(unsigned long arg) 613 { 614 struct snd_timer *timer = (struct snd_timer *) arg; 615 struct snd_timer_instance *ti; 616 struct list_head *p; 617 unsigned long resolution, ticks; 618 unsigned long flags; 619 620 spin_lock_irqsave(&timer->lock, flags); 621 /* now process all callbacks */ 622 while (!list_empty(&timer->sack_list_head)) { 623 p = timer->sack_list_head.next; /* get first item */ 624 ti = list_entry(p, struct snd_timer_instance, ack_list); 625 626 /* remove from ack_list and make empty */ 627 list_del_init(p); 628 629 ticks = ti->pticks; 630 ti->pticks = 0; 631 resolution = ti->resolution; 632 633 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 634 spin_unlock(&timer->lock); 635 if (ti->callback) 636 ti->callback(ti, resolution, ticks); 637 spin_lock(&timer->lock); 638 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 639 } 640 spin_unlock_irqrestore(&timer->lock, flags); 641 } 642 643 /* 644 * timer interrupt 645 * 646 * ticks_left is usually equal to timer->sticks. 647 * 648 */ 649 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 650 { 651 struct snd_timer_instance *ti, *ts, *tmp; 652 unsigned long resolution, ticks; 653 struct list_head *p, *ack_list_head; 654 unsigned long flags; 655 int use_tasklet = 0; 656 657 if (timer == NULL) 658 return; 659 660 spin_lock_irqsave(&timer->lock, flags); 661 662 /* remember the current resolution */ 663 if (timer->hw.c_resolution) 664 resolution = timer->hw.c_resolution(timer); 665 else 666 resolution = timer->hw.resolution; 667 668 /* loop for all active instances 669 * Here we cannot use list_for_each_entry because the active_list of a 670 * processed instance is relinked to done_list_head before the callback 671 * is called. 672 */ 673 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 674 active_list) { 675 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 676 continue; 677 ti->pticks += ticks_left; 678 ti->resolution = resolution; 679 if (ti->cticks < ticks_left) 680 ti->cticks = 0; 681 else 682 ti->cticks -= ticks_left; 683 if (ti->cticks) /* not expired */ 684 continue; 685 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 686 ti->cticks = ti->ticks; 687 } else { 688 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 689 if (--timer->running) 690 list_del(&ti->active_list); 691 } 692 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 693 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 694 ack_list_head = &timer->ack_list_head; 695 else 696 ack_list_head = &timer->sack_list_head; 697 if (list_empty(&ti->ack_list)) 698 list_add_tail(&ti->ack_list, ack_list_head); 699 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 700 ts->pticks = ti->pticks; 701 ts->resolution = resolution; 702 if (list_empty(&ts->ack_list)) 703 list_add_tail(&ts->ack_list, ack_list_head); 704 } 705 } 706 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 707 snd_timer_reschedule(timer, timer->sticks); 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 = list_entry(p, struct snd_timer_instance, 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_irqrestore(&timer->lock, flags); 745 746 if (use_tasklet) 747 tasklet_schedule(&timer->task_queue); 748 } 749 750 /* 751 752 */ 753 754 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 755 struct snd_timer **rtimer) 756 { 757 struct snd_timer *timer; 758 int err; 759 static struct snd_device_ops ops = { 760 .dev_free = snd_timer_dev_free, 761 .dev_register = snd_timer_dev_register, 762 .dev_disconnect = snd_timer_dev_disconnect, 763 }; 764 765 if (snd_BUG_ON(!tid)) 766 return -EINVAL; 767 if (rtimer) 768 *rtimer = NULL; 769 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 770 if (timer == NULL) { 771 snd_printk(KERN_ERR "timer: cannot allocate\n"); 772 return -ENOMEM; 773 } 774 timer->tmr_class = tid->dev_class; 775 timer->card = card; 776 timer->tmr_device = tid->device; 777 timer->tmr_subdevice = tid->subdevice; 778 if (id) 779 strlcpy(timer->id, id, sizeof(timer->id)); 780 INIT_LIST_HEAD(&timer->device_list); 781 INIT_LIST_HEAD(&timer->open_list_head); 782 INIT_LIST_HEAD(&timer->active_list_head); 783 INIT_LIST_HEAD(&timer->ack_list_head); 784 INIT_LIST_HEAD(&timer->sack_list_head); 785 spin_lock_init(&timer->lock); 786 tasklet_init(&timer->task_queue, snd_timer_tasklet, 787 (unsigned long)timer); 788 if (card != NULL) { 789 timer->module = card->module; 790 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 791 if (err < 0) { 792 snd_timer_free(timer); 793 return err; 794 } 795 } 796 if (rtimer) 797 *rtimer = timer; 798 return 0; 799 } 800 801 static int snd_timer_free(struct snd_timer *timer) 802 { 803 if (!timer) 804 return 0; 805 806 mutex_lock(®ister_mutex); 807 if (! list_empty(&timer->open_list_head)) { 808 struct list_head *p, *n; 809 struct snd_timer_instance *ti; 810 snd_printk(KERN_WARNING "timer %p is busy?\n", timer); 811 list_for_each_safe(p, n, &timer->open_list_head) { 812 list_del_init(p); 813 ti = list_entry(p, struct snd_timer_instance, open_list); 814 ti->timer = NULL; 815 } 816 } 817 list_del(&timer->device_list); 818 mutex_unlock(®ister_mutex); 819 820 if (timer->private_free) 821 timer->private_free(timer); 822 kfree(timer); 823 return 0; 824 } 825 826 static int snd_timer_dev_free(struct snd_device *device) 827 { 828 struct snd_timer *timer = device->device_data; 829 return snd_timer_free(timer); 830 } 831 832 static int snd_timer_dev_register(struct snd_device *dev) 833 { 834 struct snd_timer *timer = dev->device_data; 835 struct snd_timer *timer1; 836 837 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 838 return -ENXIO; 839 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 840 !timer->hw.resolution && timer->hw.c_resolution == NULL) 841 return -EINVAL; 842 843 mutex_lock(®ister_mutex); 844 list_for_each_entry(timer1, &snd_timer_list, device_list) { 845 if (timer1->tmr_class > timer->tmr_class) 846 break; 847 if (timer1->tmr_class < timer->tmr_class) 848 continue; 849 if (timer1->card && timer->card) { 850 if (timer1->card->number > timer->card->number) 851 break; 852 if (timer1->card->number < timer->card->number) 853 continue; 854 } 855 if (timer1->tmr_device > timer->tmr_device) 856 break; 857 if (timer1->tmr_device < timer->tmr_device) 858 continue; 859 if (timer1->tmr_subdevice > timer->tmr_subdevice) 860 break; 861 if (timer1->tmr_subdevice < timer->tmr_subdevice) 862 continue; 863 /* conflicts.. */ 864 mutex_unlock(®ister_mutex); 865 return -EBUSY; 866 } 867 list_add_tail(&timer->device_list, &timer1->device_list); 868 mutex_unlock(®ister_mutex); 869 return 0; 870 } 871 872 static int snd_timer_dev_disconnect(struct snd_device *device) 873 { 874 struct snd_timer *timer = device->device_data; 875 mutex_lock(®ister_mutex); 876 list_del_init(&timer->device_list); 877 mutex_unlock(®ister_mutex); 878 return 0; 879 } 880 881 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 882 { 883 unsigned long flags; 884 unsigned long resolution = 0; 885 struct snd_timer_instance *ti, *ts; 886 887 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 888 return; 889 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 890 event > SNDRV_TIMER_EVENT_MRESUME)) 891 return; 892 spin_lock_irqsave(&timer->lock, flags); 893 if (event == SNDRV_TIMER_EVENT_MSTART || 894 event == SNDRV_TIMER_EVENT_MCONTINUE || 895 event == SNDRV_TIMER_EVENT_MRESUME) { 896 if (timer->hw.c_resolution) 897 resolution = timer->hw.c_resolution(timer); 898 else 899 resolution = timer->hw.resolution; 900 } 901 list_for_each_entry(ti, &timer->active_list_head, active_list) { 902 if (ti->ccallback) 903 ti->ccallback(ti, event, tstamp, resolution); 904 list_for_each_entry(ts, &ti->slave_active_head, active_list) 905 if (ts->ccallback) 906 ts->ccallback(ts, event, tstamp, resolution); 907 } 908 spin_unlock_irqrestore(&timer->lock, flags); 909 } 910 911 /* 912 * exported functions for global timers 913 */ 914 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 915 { 916 struct snd_timer_id tid; 917 918 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 919 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 920 tid.card = -1; 921 tid.device = device; 922 tid.subdevice = 0; 923 return snd_timer_new(NULL, id, &tid, rtimer); 924 } 925 926 int snd_timer_global_free(struct snd_timer *timer) 927 { 928 return snd_timer_free(timer); 929 } 930 931 int snd_timer_global_register(struct snd_timer *timer) 932 { 933 struct snd_device dev; 934 935 memset(&dev, 0, sizeof(dev)); 936 dev.device_data = timer; 937 return snd_timer_dev_register(&dev); 938 } 939 940 /* 941 * System timer 942 */ 943 944 struct snd_timer_system_private { 945 struct timer_list tlist; 946 unsigned long last_expires; 947 unsigned long last_jiffies; 948 unsigned long correction; 949 }; 950 951 static void snd_timer_s_function(unsigned long data) 952 { 953 struct snd_timer *timer = (struct snd_timer *)data; 954 struct snd_timer_system_private *priv = timer->private_data; 955 unsigned long jiff = jiffies; 956 if (time_after(jiff, priv->last_expires)) 957 priv->correction += (long)jiff - (long)priv->last_expires; 958 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 959 } 960 961 static int snd_timer_s_start(struct snd_timer * timer) 962 { 963 struct snd_timer_system_private *priv; 964 unsigned long njiff; 965 966 priv = (struct snd_timer_system_private *) timer->private_data; 967 njiff = (priv->last_jiffies = jiffies); 968 if (priv->correction > timer->sticks - 1) { 969 priv->correction -= timer->sticks - 1; 970 njiff++; 971 } else { 972 njiff += timer->sticks - priv->correction; 973 priv->correction = 0; 974 } 975 priv->last_expires = priv->tlist.expires = njiff; 976 add_timer(&priv->tlist); 977 return 0; 978 } 979 980 static int snd_timer_s_stop(struct snd_timer * timer) 981 { 982 struct snd_timer_system_private *priv; 983 unsigned long jiff; 984 985 priv = (struct snd_timer_system_private *) timer->private_data; 986 del_timer(&priv->tlist); 987 jiff = jiffies; 988 if (time_before(jiff, priv->last_expires)) 989 timer->sticks = priv->last_expires - jiff; 990 else 991 timer->sticks = 1; 992 priv->correction = 0; 993 return 0; 994 } 995 996 static struct snd_timer_hardware snd_timer_system = 997 { 998 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 999 .resolution = 1000000000L / HZ, 1000 .ticks = 10000000L, 1001 .start = snd_timer_s_start, 1002 .stop = snd_timer_s_stop 1003 }; 1004 1005 static void snd_timer_free_system(struct snd_timer *timer) 1006 { 1007 kfree(timer->private_data); 1008 } 1009 1010 static int snd_timer_register_system(void) 1011 { 1012 struct snd_timer *timer; 1013 struct snd_timer_system_private *priv; 1014 int err; 1015 1016 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1017 if (err < 0) 1018 return err; 1019 strcpy(timer->name, "system timer"); 1020 timer->hw = snd_timer_system; 1021 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1022 if (priv == NULL) { 1023 snd_timer_free(timer); 1024 return -ENOMEM; 1025 } 1026 init_timer(&priv->tlist); 1027 priv->tlist.function = snd_timer_s_function; 1028 priv->tlist.data = (unsigned long) timer; 1029 timer->private_data = priv; 1030 timer->private_free = snd_timer_free_system; 1031 return snd_timer_global_register(timer); 1032 } 1033 1034 #ifdef CONFIG_PROC_FS 1035 /* 1036 * Info interface 1037 */ 1038 1039 static void snd_timer_proc_read(struct snd_info_entry *entry, 1040 struct snd_info_buffer *buffer) 1041 { 1042 struct snd_timer *timer; 1043 struct snd_timer_instance *ti; 1044 1045 mutex_lock(®ister_mutex); 1046 list_for_each_entry(timer, &snd_timer_list, device_list) { 1047 switch (timer->tmr_class) { 1048 case SNDRV_TIMER_CLASS_GLOBAL: 1049 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1050 break; 1051 case SNDRV_TIMER_CLASS_CARD: 1052 snd_iprintf(buffer, "C%i-%i: ", 1053 timer->card->number, timer->tmr_device); 1054 break; 1055 case SNDRV_TIMER_CLASS_PCM: 1056 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1057 timer->tmr_device, timer->tmr_subdevice); 1058 break; 1059 default: 1060 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1061 timer->card ? timer->card->number : -1, 1062 timer->tmr_device, timer->tmr_subdevice); 1063 } 1064 snd_iprintf(buffer, "%s :", timer->name); 1065 if (timer->hw.resolution) 1066 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1067 timer->hw.resolution / 1000, 1068 timer->hw.resolution % 1000, 1069 timer->hw.ticks); 1070 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1071 snd_iprintf(buffer, " SLAVE"); 1072 snd_iprintf(buffer, "\n"); 1073 list_for_each_entry(ti, &timer->open_list_head, open_list) 1074 snd_iprintf(buffer, " Client %s : %s\n", 1075 ti->owner ? ti->owner : "unknown", 1076 ti->flags & (SNDRV_TIMER_IFLG_START | 1077 SNDRV_TIMER_IFLG_RUNNING) 1078 ? "running" : "stopped"); 1079 } 1080 mutex_unlock(®ister_mutex); 1081 } 1082 1083 static struct snd_info_entry *snd_timer_proc_entry; 1084 1085 static void __init snd_timer_proc_init(void) 1086 { 1087 struct snd_info_entry *entry; 1088 1089 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1090 if (entry != NULL) { 1091 entry->c.text.read = snd_timer_proc_read; 1092 if (snd_info_register(entry) < 0) { 1093 snd_info_free_entry(entry); 1094 entry = NULL; 1095 } 1096 } 1097 snd_timer_proc_entry = entry; 1098 } 1099 1100 static void __exit snd_timer_proc_done(void) 1101 { 1102 snd_info_free_entry(snd_timer_proc_entry); 1103 } 1104 #else /* !CONFIG_PROC_FS */ 1105 #define snd_timer_proc_init() 1106 #define snd_timer_proc_done() 1107 #endif 1108 1109 /* 1110 * USER SPACE interface 1111 */ 1112 1113 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1114 unsigned long resolution, 1115 unsigned long ticks) 1116 { 1117 struct snd_timer_user *tu = timeri->callback_data; 1118 struct snd_timer_read *r; 1119 int prev; 1120 1121 spin_lock(&tu->qlock); 1122 if (tu->qused > 0) { 1123 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1124 r = &tu->queue[prev]; 1125 if (r->resolution == resolution) { 1126 r->ticks += ticks; 1127 goto __wake; 1128 } 1129 } 1130 if (tu->qused >= tu->queue_size) { 1131 tu->overrun++; 1132 } else { 1133 r = &tu->queue[tu->qtail++]; 1134 tu->qtail %= tu->queue_size; 1135 r->resolution = resolution; 1136 r->ticks = ticks; 1137 tu->qused++; 1138 } 1139 __wake: 1140 spin_unlock(&tu->qlock); 1141 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1142 wake_up(&tu->qchange_sleep); 1143 } 1144 1145 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1146 struct snd_timer_tread *tread) 1147 { 1148 if (tu->qused >= tu->queue_size) { 1149 tu->overrun++; 1150 } else { 1151 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1152 tu->qtail %= tu->queue_size; 1153 tu->qused++; 1154 } 1155 } 1156 1157 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1158 int event, 1159 struct timespec *tstamp, 1160 unsigned long resolution) 1161 { 1162 struct snd_timer_user *tu = timeri->callback_data; 1163 struct snd_timer_tread r1; 1164 unsigned long flags; 1165 1166 if (event >= SNDRV_TIMER_EVENT_START && 1167 event <= SNDRV_TIMER_EVENT_PAUSE) 1168 tu->tstamp = *tstamp; 1169 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1170 return; 1171 r1.event = event; 1172 r1.tstamp = *tstamp; 1173 r1.val = resolution; 1174 spin_lock_irqsave(&tu->qlock, flags); 1175 snd_timer_user_append_to_tqueue(tu, &r1); 1176 spin_unlock_irqrestore(&tu->qlock, flags); 1177 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1178 wake_up(&tu->qchange_sleep); 1179 } 1180 1181 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1182 unsigned long resolution, 1183 unsigned long ticks) 1184 { 1185 struct snd_timer_user *tu = timeri->callback_data; 1186 struct snd_timer_tread *r, r1; 1187 struct timespec tstamp; 1188 int prev, append = 0; 1189 1190 memset(&tstamp, 0, sizeof(tstamp)); 1191 spin_lock(&tu->qlock); 1192 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1193 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1194 spin_unlock(&tu->qlock); 1195 return; 1196 } 1197 if (tu->last_resolution != resolution || ticks > 0) { 1198 if (timer_tstamp_monotonic) 1199 do_posix_clock_monotonic_gettime(&tstamp); 1200 else 1201 getnstimeofday(&tstamp); 1202 } 1203 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1204 tu->last_resolution != resolution) { 1205 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1206 r1.tstamp = tstamp; 1207 r1.val = resolution; 1208 snd_timer_user_append_to_tqueue(tu, &r1); 1209 tu->last_resolution = resolution; 1210 append++; 1211 } 1212 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1213 goto __wake; 1214 if (ticks == 0) 1215 goto __wake; 1216 if (tu->qused > 0) { 1217 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1218 r = &tu->tqueue[prev]; 1219 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1220 r->tstamp = tstamp; 1221 r->val += ticks; 1222 append++; 1223 goto __wake; 1224 } 1225 } 1226 r1.event = SNDRV_TIMER_EVENT_TICK; 1227 r1.tstamp = tstamp; 1228 r1.val = ticks; 1229 snd_timer_user_append_to_tqueue(tu, &r1); 1230 append++; 1231 __wake: 1232 spin_unlock(&tu->qlock); 1233 if (append == 0) 1234 return; 1235 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1236 wake_up(&tu->qchange_sleep); 1237 } 1238 1239 static int snd_timer_user_open(struct inode *inode, struct file *file) 1240 { 1241 struct snd_timer_user *tu; 1242 int err; 1243 1244 err = nonseekable_open(inode, file); 1245 if (err < 0) 1246 return err; 1247 1248 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1249 if (tu == NULL) 1250 return -ENOMEM; 1251 spin_lock_init(&tu->qlock); 1252 init_waitqueue_head(&tu->qchange_sleep); 1253 mutex_init(&tu->tread_sem); 1254 tu->ticks = 1; 1255 tu->queue_size = 128; 1256 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1257 GFP_KERNEL); 1258 if (tu->queue == NULL) { 1259 kfree(tu); 1260 return -ENOMEM; 1261 } 1262 file->private_data = tu; 1263 return 0; 1264 } 1265 1266 static int snd_timer_user_release(struct inode *inode, struct file *file) 1267 { 1268 struct snd_timer_user *tu; 1269 1270 if (file->private_data) { 1271 tu = file->private_data; 1272 file->private_data = NULL; 1273 if (tu->timeri) 1274 snd_timer_close(tu->timeri); 1275 kfree(tu->queue); 1276 kfree(tu->tqueue); 1277 kfree(tu); 1278 } 1279 return 0; 1280 } 1281 1282 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1283 { 1284 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1285 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1286 id->card = -1; 1287 id->device = -1; 1288 id->subdevice = -1; 1289 } 1290 1291 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1292 { 1293 id->dev_class = timer->tmr_class; 1294 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1295 id->card = timer->card ? timer->card->number : -1; 1296 id->device = timer->tmr_device; 1297 id->subdevice = timer->tmr_subdevice; 1298 } 1299 1300 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1301 { 1302 struct snd_timer_id id; 1303 struct snd_timer *timer; 1304 struct list_head *p; 1305 1306 if (copy_from_user(&id, _tid, sizeof(id))) 1307 return -EFAULT; 1308 mutex_lock(®ister_mutex); 1309 if (id.dev_class < 0) { /* first item */ 1310 if (list_empty(&snd_timer_list)) 1311 snd_timer_user_zero_id(&id); 1312 else { 1313 timer = list_entry(snd_timer_list.next, 1314 struct snd_timer, device_list); 1315 snd_timer_user_copy_id(&id, timer); 1316 } 1317 } else { 1318 switch (id.dev_class) { 1319 case SNDRV_TIMER_CLASS_GLOBAL: 1320 id.device = id.device < 0 ? 0 : id.device + 1; 1321 list_for_each(p, &snd_timer_list) { 1322 timer = list_entry(p, struct snd_timer, device_list); 1323 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1324 snd_timer_user_copy_id(&id, timer); 1325 break; 1326 } 1327 if (timer->tmr_device >= id.device) { 1328 snd_timer_user_copy_id(&id, timer); 1329 break; 1330 } 1331 } 1332 if (p == &snd_timer_list) 1333 snd_timer_user_zero_id(&id); 1334 break; 1335 case SNDRV_TIMER_CLASS_CARD: 1336 case SNDRV_TIMER_CLASS_PCM: 1337 if (id.card < 0) { 1338 id.card = 0; 1339 } else { 1340 if (id.card < 0) { 1341 id.card = 0; 1342 } else { 1343 if (id.device < 0) { 1344 id.device = 0; 1345 } else { 1346 if (id.subdevice < 0) { 1347 id.subdevice = 0; 1348 } else { 1349 id.subdevice++; 1350 } 1351 } 1352 } 1353 } 1354 list_for_each(p, &snd_timer_list) { 1355 timer = list_entry(p, struct snd_timer, device_list); 1356 if (timer->tmr_class > id.dev_class) { 1357 snd_timer_user_copy_id(&id, timer); 1358 break; 1359 } 1360 if (timer->tmr_class < id.dev_class) 1361 continue; 1362 if (timer->card->number > id.card) { 1363 snd_timer_user_copy_id(&id, timer); 1364 break; 1365 } 1366 if (timer->card->number < id.card) 1367 continue; 1368 if (timer->tmr_device > id.device) { 1369 snd_timer_user_copy_id(&id, timer); 1370 break; 1371 } 1372 if (timer->tmr_device < id.device) 1373 continue; 1374 if (timer->tmr_subdevice > id.subdevice) { 1375 snd_timer_user_copy_id(&id, timer); 1376 break; 1377 } 1378 if (timer->tmr_subdevice < id.subdevice) 1379 continue; 1380 snd_timer_user_copy_id(&id, timer); 1381 break; 1382 } 1383 if (p == &snd_timer_list) 1384 snd_timer_user_zero_id(&id); 1385 break; 1386 default: 1387 snd_timer_user_zero_id(&id); 1388 } 1389 } 1390 mutex_unlock(®ister_mutex); 1391 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1392 return -EFAULT; 1393 return 0; 1394 } 1395 1396 static int snd_timer_user_ginfo(struct file *file, 1397 struct snd_timer_ginfo __user *_ginfo) 1398 { 1399 struct snd_timer_ginfo *ginfo; 1400 struct snd_timer_id tid; 1401 struct snd_timer *t; 1402 struct list_head *p; 1403 int err = 0; 1404 1405 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1406 if (IS_ERR(ginfo)) 1407 return PTR_ERR(ginfo); 1408 1409 tid = ginfo->tid; 1410 memset(ginfo, 0, sizeof(*ginfo)); 1411 ginfo->tid = tid; 1412 mutex_lock(®ister_mutex); 1413 t = snd_timer_find(&tid); 1414 if (t != NULL) { 1415 ginfo->card = t->card ? t->card->number : -1; 1416 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1417 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1418 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1419 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1420 ginfo->resolution = t->hw.resolution; 1421 if (t->hw.resolution_min > 0) { 1422 ginfo->resolution_min = t->hw.resolution_min; 1423 ginfo->resolution_max = t->hw.resolution_max; 1424 } 1425 list_for_each(p, &t->open_list_head) { 1426 ginfo->clients++; 1427 } 1428 } else { 1429 err = -ENODEV; 1430 } 1431 mutex_unlock(®ister_mutex); 1432 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1433 err = -EFAULT; 1434 kfree(ginfo); 1435 return err; 1436 } 1437 1438 static int snd_timer_user_gparams(struct file *file, 1439 struct snd_timer_gparams __user *_gparams) 1440 { 1441 struct snd_timer_gparams gparams; 1442 struct snd_timer *t; 1443 int err; 1444 1445 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1446 return -EFAULT; 1447 mutex_lock(®ister_mutex); 1448 t = snd_timer_find(&gparams.tid); 1449 if (!t) { 1450 err = -ENODEV; 1451 goto _error; 1452 } 1453 if (!list_empty(&t->open_list_head)) { 1454 err = -EBUSY; 1455 goto _error; 1456 } 1457 if (!t->hw.set_period) { 1458 err = -ENOSYS; 1459 goto _error; 1460 } 1461 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1462 _error: 1463 mutex_unlock(®ister_mutex); 1464 return err; 1465 } 1466 1467 static int snd_timer_user_gstatus(struct file *file, 1468 struct snd_timer_gstatus __user *_gstatus) 1469 { 1470 struct snd_timer_gstatus gstatus; 1471 struct snd_timer_id tid; 1472 struct snd_timer *t; 1473 int err = 0; 1474 1475 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1476 return -EFAULT; 1477 tid = gstatus.tid; 1478 memset(&gstatus, 0, sizeof(gstatus)); 1479 gstatus.tid = tid; 1480 mutex_lock(®ister_mutex); 1481 t = snd_timer_find(&tid); 1482 if (t != NULL) { 1483 if (t->hw.c_resolution) 1484 gstatus.resolution = t->hw.c_resolution(t); 1485 else 1486 gstatus.resolution = t->hw.resolution; 1487 if (t->hw.precise_resolution) { 1488 t->hw.precise_resolution(t, &gstatus.resolution_num, 1489 &gstatus.resolution_den); 1490 } else { 1491 gstatus.resolution_num = gstatus.resolution; 1492 gstatus.resolution_den = 1000000000uL; 1493 } 1494 } else { 1495 err = -ENODEV; 1496 } 1497 mutex_unlock(®ister_mutex); 1498 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1499 err = -EFAULT; 1500 return err; 1501 } 1502 1503 static int snd_timer_user_tselect(struct file *file, 1504 struct snd_timer_select __user *_tselect) 1505 { 1506 struct snd_timer_user *tu; 1507 struct snd_timer_select tselect; 1508 char str[32]; 1509 int err = 0; 1510 1511 tu = file->private_data; 1512 mutex_lock(&tu->tread_sem); 1513 if (tu->timeri) { 1514 snd_timer_close(tu->timeri); 1515 tu->timeri = NULL; 1516 } 1517 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1518 err = -EFAULT; 1519 goto __err; 1520 } 1521 sprintf(str, "application %i", current->pid); 1522 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1523 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1524 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1525 if (err < 0) 1526 goto __err; 1527 1528 kfree(tu->queue); 1529 tu->queue = NULL; 1530 kfree(tu->tqueue); 1531 tu->tqueue = NULL; 1532 if (tu->tread) { 1533 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1534 GFP_KERNEL); 1535 if (tu->tqueue == NULL) 1536 err = -ENOMEM; 1537 } else { 1538 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1539 GFP_KERNEL); 1540 if (tu->queue == NULL) 1541 err = -ENOMEM; 1542 } 1543 1544 if (err < 0) { 1545 snd_timer_close(tu->timeri); 1546 tu->timeri = NULL; 1547 } else { 1548 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1549 tu->timeri->callback = tu->tread 1550 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1551 tu->timeri->ccallback = snd_timer_user_ccallback; 1552 tu->timeri->callback_data = (void *)tu; 1553 } 1554 1555 __err: 1556 mutex_unlock(&tu->tread_sem); 1557 return err; 1558 } 1559 1560 static int snd_timer_user_info(struct file *file, 1561 struct snd_timer_info __user *_info) 1562 { 1563 struct snd_timer_user *tu; 1564 struct snd_timer_info *info; 1565 struct snd_timer *t; 1566 int err = 0; 1567 1568 tu = file->private_data; 1569 if (!tu->timeri) 1570 return -EBADFD; 1571 t = tu->timeri->timer; 1572 if (!t) 1573 return -EBADFD; 1574 1575 info = kzalloc(sizeof(*info), GFP_KERNEL); 1576 if (! info) 1577 return -ENOMEM; 1578 info->card = t->card ? t->card->number : -1; 1579 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1580 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1581 strlcpy(info->id, t->id, sizeof(info->id)); 1582 strlcpy(info->name, t->name, sizeof(info->name)); 1583 info->resolution = t->hw.resolution; 1584 if (copy_to_user(_info, info, sizeof(*_info))) 1585 err = -EFAULT; 1586 kfree(info); 1587 return err; 1588 } 1589 1590 static int snd_timer_user_params(struct file *file, 1591 struct snd_timer_params __user *_params) 1592 { 1593 struct snd_timer_user *tu; 1594 struct snd_timer_params params; 1595 struct snd_timer *t; 1596 struct snd_timer_read *tr; 1597 struct snd_timer_tread *ttr; 1598 int err; 1599 1600 tu = file->private_data; 1601 if (!tu->timeri) 1602 return -EBADFD; 1603 t = tu->timeri->timer; 1604 if (!t) 1605 return -EBADFD; 1606 if (copy_from_user(¶ms, _params, sizeof(params))) 1607 return -EFAULT; 1608 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1609 err = -EINVAL; 1610 goto _end; 1611 } 1612 if (params.queue_size > 0 && 1613 (params.queue_size < 32 || params.queue_size > 1024)) { 1614 err = -EINVAL; 1615 goto _end; 1616 } 1617 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1618 (1<<SNDRV_TIMER_EVENT_TICK)| 1619 (1<<SNDRV_TIMER_EVENT_START)| 1620 (1<<SNDRV_TIMER_EVENT_STOP)| 1621 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1622 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1623 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1624 (1<<SNDRV_TIMER_EVENT_RESUME)| 1625 (1<<SNDRV_TIMER_EVENT_MSTART)| 1626 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1627 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1628 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1629 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1630 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1631 err = -EINVAL; 1632 goto _end; 1633 } 1634 snd_timer_stop(tu->timeri); 1635 spin_lock_irq(&t->lock); 1636 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1637 SNDRV_TIMER_IFLG_EXCLUSIVE| 1638 SNDRV_TIMER_IFLG_EARLY_EVENT); 1639 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1640 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1641 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1642 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1643 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1644 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1645 spin_unlock_irq(&t->lock); 1646 if (params.queue_size > 0 && 1647 (unsigned int)tu->queue_size != params.queue_size) { 1648 if (tu->tread) { 1649 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1650 GFP_KERNEL); 1651 if (ttr) { 1652 kfree(tu->tqueue); 1653 tu->queue_size = params.queue_size; 1654 tu->tqueue = ttr; 1655 } 1656 } else { 1657 tr = kmalloc(params.queue_size * sizeof(*tr), 1658 GFP_KERNEL); 1659 if (tr) { 1660 kfree(tu->queue); 1661 tu->queue_size = params.queue_size; 1662 tu->queue = tr; 1663 } 1664 } 1665 } 1666 tu->qhead = tu->qtail = tu->qused = 0; 1667 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1668 if (tu->tread) { 1669 struct snd_timer_tread tread; 1670 tread.event = SNDRV_TIMER_EVENT_EARLY; 1671 tread.tstamp.tv_sec = 0; 1672 tread.tstamp.tv_nsec = 0; 1673 tread.val = 0; 1674 snd_timer_user_append_to_tqueue(tu, &tread); 1675 } else { 1676 struct snd_timer_read *r = &tu->queue[0]; 1677 r->resolution = 0; 1678 r->ticks = 0; 1679 tu->qused++; 1680 tu->qtail++; 1681 } 1682 } 1683 tu->filter = params.filter; 1684 tu->ticks = params.ticks; 1685 err = 0; 1686 _end: 1687 if (copy_to_user(_params, ¶ms, sizeof(params))) 1688 return -EFAULT; 1689 return err; 1690 } 1691 1692 static int snd_timer_user_status(struct file *file, 1693 struct snd_timer_status __user *_status) 1694 { 1695 struct snd_timer_user *tu; 1696 struct snd_timer_status status; 1697 1698 tu = file->private_data; 1699 if (!tu->timeri) 1700 return -EBADFD; 1701 memset(&status, 0, sizeof(status)); 1702 status.tstamp = tu->tstamp; 1703 status.resolution = snd_timer_resolution(tu->timeri); 1704 status.lost = tu->timeri->lost; 1705 status.overrun = tu->overrun; 1706 spin_lock_irq(&tu->qlock); 1707 status.queue = tu->qused; 1708 spin_unlock_irq(&tu->qlock); 1709 if (copy_to_user(_status, &status, sizeof(status))) 1710 return -EFAULT; 1711 return 0; 1712 } 1713 1714 static int snd_timer_user_start(struct file *file) 1715 { 1716 int err; 1717 struct snd_timer_user *tu; 1718 1719 tu = file->private_data; 1720 if (!tu->timeri) 1721 return -EBADFD; 1722 snd_timer_stop(tu->timeri); 1723 tu->timeri->lost = 0; 1724 tu->last_resolution = 0; 1725 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1726 } 1727 1728 static int snd_timer_user_stop(struct file *file) 1729 { 1730 int err; 1731 struct snd_timer_user *tu; 1732 1733 tu = file->private_data; 1734 if (!tu->timeri) 1735 return -EBADFD; 1736 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1737 } 1738 1739 static int snd_timer_user_continue(struct file *file) 1740 { 1741 int err; 1742 struct snd_timer_user *tu; 1743 1744 tu = file->private_data; 1745 if (!tu->timeri) 1746 return -EBADFD; 1747 tu->timeri->lost = 0; 1748 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1749 } 1750 1751 static int snd_timer_user_pause(struct file *file) 1752 { 1753 int err; 1754 struct snd_timer_user *tu; 1755 1756 tu = file->private_data; 1757 if (!tu->timeri) 1758 return -EBADFD; 1759 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1760 } 1761 1762 enum { 1763 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1764 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1765 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1766 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1767 }; 1768 1769 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1770 unsigned long arg) 1771 { 1772 struct snd_timer_user *tu; 1773 void __user *argp = (void __user *)arg; 1774 int __user *p = argp; 1775 1776 tu = file->private_data; 1777 switch (cmd) { 1778 case SNDRV_TIMER_IOCTL_PVERSION: 1779 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1780 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1781 return snd_timer_user_next_device(argp); 1782 case SNDRV_TIMER_IOCTL_TREAD: 1783 { 1784 int xarg; 1785 1786 mutex_lock(&tu->tread_sem); 1787 if (tu->timeri) { /* too late */ 1788 mutex_unlock(&tu->tread_sem); 1789 return -EBUSY; 1790 } 1791 if (get_user(xarg, p)) { 1792 mutex_unlock(&tu->tread_sem); 1793 return -EFAULT; 1794 } 1795 tu->tread = xarg ? 1 : 0; 1796 mutex_unlock(&tu->tread_sem); 1797 return 0; 1798 } 1799 case SNDRV_TIMER_IOCTL_GINFO: 1800 return snd_timer_user_ginfo(file, argp); 1801 case SNDRV_TIMER_IOCTL_GPARAMS: 1802 return snd_timer_user_gparams(file, argp); 1803 case SNDRV_TIMER_IOCTL_GSTATUS: 1804 return snd_timer_user_gstatus(file, argp); 1805 case SNDRV_TIMER_IOCTL_SELECT: 1806 return snd_timer_user_tselect(file, argp); 1807 case SNDRV_TIMER_IOCTL_INFO: 1808 return snd_timer_user_info(file, argp); 1809 case SNDRV_TIMER_IOCTL_PARAMS: 1810 return snd_timer_user_params(file, argp); 1811 case SNDRV_TIMER_IOCTL_STATUS: 1812 return snd_timer_user_status(file, argp); 1813 case SNDRV_TIMER_IOCTL_START: 1814 case SNDRV_TIMER_IOCTL_START_OLD: 1815 return snd_timer_user_start(file); 1816 case SNDRV_TIMER_IOCTL_STOP: 1817 case SNDRV_TIMER_IOCTL_STOP_OLD: 1818 return snd_timer_user_stop(file); 1819 case SNDRV_TIMER_IOCTL_CONTINUE: 1820 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1821 return snd_timer_user_continue(file); 1822 case SNDRV_TIMER_IOCTL_PAUSE: 1823 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1824 return snd_timer_user_pause(file); 1825 } 1826 return -ENOTTY; 1827 } 1828 1829 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1830 { 1831 struct snd_timer_user *tu; 1832 1833 tu = file->private_data; 1834 return fasync_helper(fd, file, on, &tu->fasync); 1835 } 1836 1837 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1838 size_t count, loff_t *offset) 1839 { 1840 struct snd_timer_user *tu; 1841 long result = 0, unit; 1842 int err = 0; 1843 1844 tu = file->private_data; 1845 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1846 spin_lock_irq(&tu->qlock); 1847 while ((long)count - result >= unit) { 1848 while (!tu->qused) { 1849 wait_queue_t wait; 1850 1851 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1852 err = -EAGAIN; 1853 break; 1854 } 1855 1856 set_current_state(TASK_INTERRUPTIBLE); 1857 init_waitqueue_entry(&wait, current); 1858 add_wait_queue(&tu->qchange_sleep, &wait); 1859 1860 spin_unlock_irq(&tu->qlock); 1861 schedule(); 1862 spin_lock_irq(&tu->qlock); 1863 1864 remove_wait_queue(&tu->qchange_sleep, &wait); 1865 1866 if (signal_pending(current)) { 1867 err = -ERESTARTSYS; 1868 break; 1869 } 1870 } 1871 1872 spin_unlock_irq(&tu->qlock); 1873 if (err < 0) 1874 goto _error; 1875 1876 if (tu->tread) { 1877 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1878 sizeof(struct snd_timer_tread))) { 1879 err = -EFAULT; 1880 goto _error; 1881 } 1882 } else { 1883 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1884 sizeof(struct snd_timer_read))) { 1885 err = -EFAULT; 1886 goto _error; 1887 } 1888 } 1889 1890 tu->qhead %= tu->queue_size; 1891 1892 result += unit; 1893 buffer += unit; 1894 1895 spin_lock_irq(&tu->qlock); 1896 tu->qused--; 1897 } 1898 spin_unlock_irq(&tu->qlock); 1899 _error: 1900 return result > 0 ? result : err; 1901 } 1902 1903 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1904 { 1905 unsigned int mask; 1906 struct snd_timer_user *tu; 1907 1908 tu = file->private_data; 1909 1910 poll_wait(file, &tu->qchange_sleep, wait); 1911 1912 mask = 0; 1913 if (tu->qused) 1914 mask |= POLLIN | POLLRDNORM; 1915 1916 return mask; 1917 } 1918 1919 #ifdef CONFIG_COMPAT 1920 #include "timer_compat.c" 1921 #else 1922 #define snd_timer_user_ioctl_compat NULL 1923 #endif 1924 1925 static const struct file_operations snd_timer_f_ops = 1926 { 1927 .owner = THIS_MODULE, 1928 .read = snd_timer_user_read, 1929 .open = snd_timer_user_open, 1930 .release = snd_timer_user_release, 1931 .llseek = no_llseek, 1932 .poll = snd_timer_user_poll, 1933 .unlocked_ioctl = snd_timer_user_ioctl, 1934 .compat_ioctl = snd_timer_user_ioctl_compat, 1935 .fasync = snd_timer_user_fasync, 1936 }; 1937 1938 /* 1939 * ENTRY functions 1940 */ 1941 1942 static int __init alsa_timer_init(void) 1943 { 1944 int err; 1945 1946 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1947 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 1948 "system timer"); 1949 #endif 1950 1951 if ((err = snd_timer_register_system()) < 0) 1952 snd_printk(KERN_ERR "unable to register system timer (%i)\n", 1953 err); 1954 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 1955 &snd_timer_f_ops, NULL, "timer")) < 0) 1956 snd_printk(KERN_ERR "unable to register timer device (%i)\n", 1957 err); 1958 snd_timer_proc_init(); 1959 return 0; 1960 } 1961 1962 static void __exit alsa_timer_exit(void) 1963 { 1964 struct list_head *p, *n; 1965 1966 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 1967 /* unregister the system timer */ 1968 list_for_each_safe(p, n, &snd_timer_list) { 1969 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list); 1970 snd_timer_free(timer); 1971 } 1972 snd_timer_proc_done(); 1973 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1974 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1975 #endif 1976 } 1977 1978 module_init(alsa_timer_init) 1979 module_exit(alsa_timer_exit) 1980 1981 EXPORT_SYMBOL(snd_timer_open); 1982 EXPORT_SYMBOL(snd_timer_close); 1983 EXPORT_SYMBOL(snd_timer_resolution); 1984 EXPORT_SYMBOL(snd_timer_start); 1985 EXPORT_SYMBOL(snd_timer_stop); 1986 EXPORT_SYMBOL(snd_timer_continue); 1987 EXPORT_SYMBOL(snd_timer_pause); 1988 EXPORT_SYMBOL(snd_timer_new); 1989 EXPORT_SYMBOL(snd_timer_notify); 1990 EXPORT_SYMBOL(snd_timer_global_new); 1991 EXPORT_SYMBOL(snd_timer_global_free); 1992 EXPORT_SYMBOL(snd_timer_global_register); 1993 EXPORT_SYMBOL(snd_timer_interrupt); 1994