1 /* 2 * Timers abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/delay.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/time.h> 26 #include <linux/mutex.h> 27 #include <linux/device.h> 28 #include <linux/module.h> 29 #include <linux/string.h> 30 #include <sound/core.h> 31 #include <sound/timer.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/minors.h> 35 #include <sound/initval.h> 36 #include <linux/kmod.h> 37 38 #if IS_ENABLED(CONFIG_SND_HRTIMER) 39 #define DEFAULT_TIMER_LIMIT 4 40 #elif IS_ENABLED(CONFIG_SND_RTCTIMER) 41 #define DEFAULT_TIMER_LIMIT 2 42 #else 43 #define DEFAULT_TIMER_LIMIT 1 44 #endif 45 46 static int timer_limit = DEFAULT_TIMER_LIMIT; 47 static int timer_tstamp_monotonic = 1; 48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); 49 MODULE_DESCRIPTION("ALSA timer interface"); 50 MODULE_LICENSE("GPL"); 51 module_param(timer_limit, int, 0444); 52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 53 module_param(timer_tstamp_monotonic, int, 0444); 54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); 55 56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); 57 MODULE_ALIAS("devname:snd/timer"); 58 59 struct snd_timer_user { 60 struct snd_timer_instance *timeri; 61 int tread; /* enhanced read with timestamps and events */ 62 unsigned long ticks; 63 unsigned long overrun; 64 int qhead; 65 int qtail; 66 int qused; 67 int queue_size; 68 bool disconnected; 69 struct snd_timer_read *queue; 70 struct snd_timer_tread *tqueue; 71 spinlock_t qlock; 72 unsigned long last_resolution; 73 unsigned int filter; 74 struct timespec tstamp; /* trigger tstamp */ 75 wait_queue_head_t qchange_sleep; 76 struct fasync_struct *fasync; 77 struct mutex ioctl_lock; 78 }; 79 80 /* list of timers */ 81 static LIST_HEAD(snd_timer_list); 82 83 /* list of slave instances */ 84 static LIST_HEAD(snd_timer_slave_list); 85 86 /* lock for slave active lists */ 87 static DEFINE_SPINLOCK(slave_active_lock); 88 89 static DEFINE_MUTEX(register_mutex); 90 91 static int snd_timer_free(struct snd_timer *timer); 92 static int snd_timer_dev_free(struct snd_device *device); 93 static int snd_timer_dev_register(struct snd_device *device); 94 static int snd_timer_dev_disconnect(struct snd_device *device); 95 96 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 97 98 /* 99 * create a timer instance with the given owner string. 100 * when timer is not NULL, increments the module counter 101 */ 102 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 103 struct snd_timer *timer) 104 { 105 struct snd_timer_instance *timeri; 106 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 107 if (timeri == NULL) 108 return NULL; 109 timeri->owner = kstrdup(owner, GFP_KERNEL); 110 if (! timeri->owner) { 111 kfree(timeri); 112 return NULL; 113 } 114 INIT_LIST_HEAD(&timeri->open_list); 115 INIT_LIST_HEAD(&timeri->active_list); 116 INIT_LIST_HEAD(&timeri->ack_list); 117 INIT_LIST_HEAD(&timeri->slave_list_head); 118 INIT_LIST_HEAD(&timeri->slave_active_head); 119 120 timeri->timer = timer; 121 if (timer && !try_module_get(timer->module)) { 122 kfree(timeri->owner); 123 kfree(timeri); 124 return NULL; 125 } 126 127 return timeri; 128 } 129 130 /* 131 * find a timer instance from the given timer id 132 */ 133 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 134 { 135 struct snd_timer *timer = NULL; 136 137 list_for_each_entry(timer, &snd_timer_list, device_list) { 138 if (timer->tmr_class != tid->dev_class) 139 continue; 140 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 141 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 142 (timer->card == NULL || 143 timer->card->number != tid->card)) 144 continue; 145 if (timer->tmr_device != tid->device) 146 continue; 147 if (timer->tmr_subdevice != tid->subdevice) 148 continue; 149 return timer; 150 } 151 return NULL; 152 } 153 154 #ifdef CONFIG_MODULES 155 156 static void snd_timer_request(struct snd_timer_id *tid) 157 { 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(struct snd_timer_instance *slave) 182 { 183 struct snd_timer *timer; 184 struct snd_timer_instance *master; 185 186 /* FIXME: it's really dumb to look up all entries.. */ 187 list_for_each_entry(timer, &snd_timer_list, device_list) { 188 list_for_each_entry(master, &timer->open_list_head, open_list) { 189 if (slave->slave_class == master->slave_class && 190 slave->slave_id == master->slave_id) { 191 list_move_tail(&slave->open_list, 192 &master->slave_list_head); 193 spin_lock_irq(&slave_active_lock); 194 slave->master = master; 195 slave->timer = master->timer; 196 spin_unlock_irq(&slave_active_lock); 197 return; 198 } 199 } 200 } 201 } 202 203 /* 204 * look for slave instances matching with the slave id of the given master. 205 * when found, relink the open_link of slaves. 206 * 207 * call this with register_mutex down. 208 */ 209 static void snd_timer_check_master(struct snd_timer_instance *master) 210 { 211 struct snd_timer_instance *slave, *tmp; 212 213 /* check all pending slaves */ 214 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 215 if (slave->slave_class == master->slave_class && 216 slave->slave_id == master->slave_id) { 217 list_move_tail(&slave->open_list, &master->slave_list_head); 218 spin_lock_irq(&slave_active_lock); 219 spin_lock(&master->timer->lock); 220 slave->master = master; 221 slave->timer = master->timer; 222 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 223 list_add_tail(&slave->active_list, 224 &master->slave_active_head); 225 spin_unlock(&master->timer->lock); 226 spin_unlock_irq(&slave_active_lock); 227 } 228 } 229 } 230 231 /* 232 * open a timer instance 233 * when opening a master, the slave id must be here given. 234 */ 235 int snd_timer_open(struct snd_timer_instance **ti, 236 char *owner, struct snd_timer_id *tid, 237 unsigned int slave_id) 238 { 239 struct snd_timer *timer; 240 struct snd_timer_instance *timeri = NULL; 241 242 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 243 /* open a slave instance */ 244 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 245 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 246 pr_debug("ALSA: timer: invalid slave class %i\n", 247 tid->dev_sclass); 248 return -EINVAL; 249 } 250 mutex_lock(®ister_mutex); 251 timeri = snd_timer_instance_new(owner, NULL); 252 if (!timeri) { 253 mutex_unlock(®ister_mutex); 254 return -ENOMEM; 255 } 256 timeri->slave_class = tid->dev_sclass; 257 timeri->slave_id = tid->device; 258 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 259 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 260 snd_timer_check_slave(timeri); 261 mutex_unlock(®ister_mutex); 262 *ti = timeri; 263 return 0; 264 } 265 266 /* open a master instance */ 267 mutex_lock(®ister_mutex); 268 timer = snd_timer_find(tid); 269 #ifdef CONFIG_MODULES 270 if (!timer) { 271 mutex_unlock(®ister_mutex); 272 snd_timer_request(tid); 273 mutex_lock(®ister_mutex); 274 timer = snd_timer_find(tid); 275 } 276 #endif 277 if (!timer) { 278 mutex_unlock(®ister_mutex); 279 return -ENODEV; 280 } 281 if (!list_empty(&timer->open_list_head)) { 282 timeri = list_entry(timer->open_list_head.next, 283 struct snd_timer_instance, open_list); 284 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 285 mutex_unlock(®ister_mutex); 286 return -EBUSY; 287 } 288 } 289 timeri = snd_timer_instance_new(owner, timer); 290 if (!timeri) { 291 mutex_unlock(®ister_mutex); 292 return -ENOMEM; 293 } 294 /* take a card refcount for safe disconnection */ 295 if (timer->card) 296 get_device(&timer->card->card_dev); 297 timeri->slave_class = tid->dev_sclass; 298 timeri->slave_id = slave_id; 299 if (list_empty(&timer->open_list_head) && timer->hw.open) 300 timer->hw.open(timer); 301 list_add_tail(&timeri->open_list, &timer->open_list_head); 302 snd_timer_check_master(timeri); 303 mutex_unlock(®ister_mutex); 304 *ti = timeri; 305 return 0; 306 } 307 308 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event); 309 310 /* 311 * close a timer instance 312 */ 313 int snd_timer_close(struct snd_timer_instance *timeri) 314 { 315 struct snd_timer *timer = NULL; 316 struct snd_timer_instance *slave, *tmp; 317 318 if (snd_BUG_ON(!timeri)) 319 return -ENXIO; 320 321 /* force to stop the timer */ 322 snd_timer_stop(timeri); 323 324 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 325 /* wait, until the active callback is finished */ 326 spin_lock_irq(&slave_active_lock); 327 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 328 spin_unlock_irq(&slave_active_lock); 329 udelay(10); 330 spin_lock_irq(&slave_active_lock); 331 } 332 spin_unlock_irq(&slave_active_lock); 333 mutex_lock(®ister_mutex); 334 list_del(&timeri->open_list); 335 mutex_unlock(®ister_mutex); 336 } else { 337 timer = timeri->timer; 338 if (snd_BUG_ON(!timer)) 339 goto out; 340 /* wait, until the active callback is finished */ 341 spin_lock_irq(&timer->lock); 342 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 343 spin_unlock_irq(&timer->lock); 344 udelay(10); 345 spin_lock_irq(&timer->lock); 346 } 347 spin_unlock_irq(&timer->lock); 348 mutex_lock(®ister_mutex); 349 list_del(&timeri->open_list); 350 if (list_empty(&timer->open_list_head) && 351 timer->hw.close) 352 timer->hw.close(timer); 353 /* remove slave links */ 354 spin_lock_irq(&slave_active_lock); 355 spin_lock(&timer->lock); 356 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 357 open_list) { 358 list_move_tail(&slave->open_list, &snd_timer_slave_list); 359 slave->master = NULL; 360 slave->timer = NULL; 361 list_del_init(&slave->ack_list); 362 list_del_init(&slave->active_list); 363 } 364 spin_unlock(&timer->lock); 365 spin_unlock_irq(&slave_active_lock); 366 /* release a card refcount for safe disconnection */ 367 if (timer->card) 368 put_device(&timer->card->card_dev); 369 mutex_unlock(®ister_mutex); 370 } 371 out: 372 if (timeri->private_free) 373 timeri->private_free(timeri); 374 kfree(timeri->owner); 375 kfree(timeri); 376 if (timer) 377 module_put(timer->module); 378 return 0; 379 } 380 381 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 382 { 383 struct snd_timer * timer; 384 385 if (timeri == NULL) 386 return 0; 387 if ((timer = timeri->timer) != NULL) { 388 if (timer->hw.c_resolution) 389 return timer->hw.c_resolution(timer); 390 return timer->hw.resolution; 391 } 392 return 0; 393 } 394 395 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 396 { 397 struct snd_timer *timer; 398 unsigned long flags; 399 unsigned long resolution = 0; 400 struct snd_timer_instance *ts; 401 struct timespec tstamp; 402 403 if (timer_tstamp_monotonic) 404 ktime_get_ts(&tstamp); 405 else 406 getnstimeofday(&tstamp); 407 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 408 event > SNDRV_TIMER_EVENT_PAUSE)) 409 return; 410 if (event == SNDRV_TIMER_EVENT_START || 411 event == SNDRV_TIMER_EVENT_CONTINUE) 412 resolution = snd_timer_resolution(ti); 413 if (ti->ccallback) 414 ti->ccallback(ti, event, &tstamp, resolution); 415 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 416 return; 417 timer = ti->timer; 418 if (timer == NULL) 419 return; 420 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 421 return; 422 spin_lock_irqsave(&timer->lock, flags); 423 list_for_each_entry(ts, &ti->slave_active_head, active_list) 424 if (ts->ccallback) 425 ts->ccallback(ti, event + 100, &tstamp, resolution); 426 spin_unlock_irqrestore(&timer->lock, flags); 427 } 428 429 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 430 unsigned long sticks) 431 { 432 list_move_tail(&timeri->active_list, &timer->active_list_head); 433 if (timer->running) { 434 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 435 goto __start_now; 436 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 437 timeri->flags |= SNDRV_TIMER_IFLG_START; 438 return 1; /* delayed start */ 439 } else { 440 timer->sticks = sticks; 441 timer->hw.start(timer); 442 __start_now: 443 timer->running++; 444 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 445 return 0; 446 } 447 } 448 449 static int snd_timer_start_slave(struct snd_timer_instance *timeri) 450 { 451 unsigned long flags; 452 453 spin_lock_irqsave(&slave_active_lock, flags); 454 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 455 if (timeri->master && timeri->timer) { 456 spin_lock(&timeri->timer->lock); 457 list_add_tail(&timeri->active_list, 458 &timeri->master->slave_active_head); 459 spin_unlock(&timeri->timer->lock); 460 } 461 spin_unlock_irqrestore(&slave_active_lock, flags); 462 return 1; /* delayed start */ 463 } 464 465 /* 466 * start the timer instance 467 */ 468 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 469 { 470 struct snd_timer *timer; 471 int result = -EINVAL; 472 unsigned long flags; 473 474 if (timeri == NULL || ticks < 1) 475 return -EINVAL; 476 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 477 result = snd_timer_start_slave(timeri); 478 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 479 return result; 480 } 481 timer = timeri->timer; 482 if (timer == NULL) 483 return -EINVAL; 484 if (timer->card && timer->card->shutdown) 485 return -ENODEV; 486 spin_lock_irqsave(&timer->lock, flags); 487 timeri->ticks = timeri->cticks = ticks; 488 timeri->pticks = 0; 489 result = snd_timer_start1(timer, timeri, ticks); 490 spin_unlock_irqrestore(&timer->lock, flags); 491 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 492 return result; 493 } 494 495 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event) 496 { 497 struct snd_timer *timer; 498 unsigned long flags; 499 500 if (snd_BUG_ON(!timeri)) 501 return -ENXIO; 502 503 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 504 spin_lock_irqsave(&slave_active_lock, flags); 505 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 506 list_del_init(&timeri->ack_list); 507 list_del_init(&timeri->active_list); 508 spin_unlock_irqrestore(&slave_active_lock, flags); 509 goto __end; 510 } 511 timer = timeri->timer; 512 if (!timer) 513 return -EINVAL; 514 spin_lock_irqsave(&timer->lock, flags); 515 list_del_init(&timeri->ack_list); 516 list_del_init(&timeri->active_list); 517 if (timer->card && timer->card->shutdown) { 518 spin_unlock_irqrestore(&timer->lock, flags); 519 return 0; 520 } 521 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 522 !(--timer->running)) { 523 timer->hw.stop(timer); 524 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 525 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 526 snd_timer_reschedule(timer, 0); 527 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 528 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 529 timer->hw.start(timer); 530 } 531 } 532 } 533 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 534 spin_unlock_irqrestore(&timer->lock, flags); 535 __end: 536 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 537 snd_timer_notify1(timeri, event); 538 return 0; 539 } 540 541 /* 542 * stop the timer instance. 543 * 544 * do not call this from the timer callback! 545 */ 546 int snd_timer_stop(struct snd_timer_instance *timeri) 547 { 548 struct snd_timer *timer; 549 unsigned long flags; 550 int err; 551 552 err = _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_STOP); 553 if (err < 0) 554 return err; 555 timer = timeri->timer; 556 if (!timer) 557 return -EINVAL; 558 spin_lock_irqsave(&timer->lock, flags); 559 timeri->cticks = timeri->ticks; 560 timeri->pticks = 0; 561 spin_unlock_irqrestore(&timer->lock, flags); 562 return 0; 563 } 564 565 /* 566 * start again.. the tick is kept. 567 */ 568 int snd_timer_continue(struct snd_timer_instance *timeri) 569 { 570 struct snd_timer *timer; 571 int result = -EINVAL; 572 unsigned long flags; 573 574 if (timeri == NULL) 575 return result; 576 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 577 return snd_timer_start_slave(timeri); 578 timer = timeri->timer; 579 if (! timer) 580 return -EINVAL; 581 if (timer->card && timer->card->shutdown) 582 return -ENODEV; 583 spin_lock_irqsave(&timer->lock, flags); 584 if (!timeri->cticks) 585 timeri->cticks = 1; 586 timeri->pticks = 0; 587 result = snd_timer_start1(timer, timeri, timer->sticks); 588 spin_unlock_irqrestore(&timer->lock, flags); 589 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 590 return result; 591 } 592 593 /* 594 * pause.. remember the ticks left 595 */ 596 int snd_timer_pause(struct snd_timer_instance * timeri) 597 { 598 return _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_PAUSE); 599 } 600 601 /* 602 * reschedule the timer 603 * 604 * start pending instances and check the scheduling ticks. 605 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 606 */ 607 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 608 { 609 struct snd_timer_instance *ti; 610 unsigned long ticks = ~0UL; 611 612 list_for_each_entry(ti, &timer->active_list_head, active_list) { 613 if (ti->flags & SNDRV_TIMER_IFLG_START) { 614 ti->flags &= ~SNDRV_TIMER_IFLG_START; 615 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 616 timer->running++; 617 } 618 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 619 if (ticks > ti->cticks) 620 ticks = ti->cticks; 621 } 622 } 623 if (ticks == ~0UL) { 624 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 625 return; 626 } 627 if (ticks > timer->hw.ticks) 628 ticks = timer->hw.ticks; 629 if (ticks_left != ticks) 630 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 631 timer->sticks = ticks; 632 } 633 634 /* 635 * timer tasklet 636 * 637 */ 638 static void snd_timer_tasklet(unsigned long arg) 639 { 640 struct snd_timer *timer = (struct snd_timer *) arg; 641 struct snd_timer_instance *ti; 642 struct list_head *p; 643 unsigned long resolution, ticks; 644 unsigned long flags; 645 646 if (timer->card && timer->card->shutdown) 647 return; 648 649 spin_lock_irqsave(&timer->lock, flags); 650 /* now process all callbacks */ 651 while (!list_empty(&timer->sack_list_head)) { 652 p = timer->sack_list_head.next; /* get first item */ 653 ti = list_entry(p, struct snd_timer_instance, ack_list); 654 655 /* remove from ack_list and make empty */ 656 list_del_init(p); 657 658 ticks = ti->pticks; 659 ti->pticks = 0; 660 resolution = ti->resolution; 661 662 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 663 spin_unlock(&timer->lock); 664 if (ti->callback) 665 ti->callback(ti, resolution, ticks); 666 spin_lock(&timer->lock); 667 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 668 } 669 spin_unlock_irqrestore(&timer->lock, flags); 670 } 671 672 /* 673 * timer interrupt 674 * 675 * ticks_left is usually equal to timer->sticks. 676 * 677 */ 678 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 679 { 680 struct snd_timer_instance *ti, *ts, *tmp; 681 unsigned long resolution, ticks; 682 struct list_head *p, *ack_list_head; 683 unsigned long flags; 684 int use_tasklet = 0; 685 686 if (timer == NULL) 687 return; 688 689 if (timer->card && timer->card->shutdown) 690 return; 691 692 spin_lock_irqsave(&timer->lock, flags); 693 694 /* remember the current resolution */ 695 if (timer->hw.c_resolution) 696 resolution = timer->hw.c_resolution(timer); 697 else 698 resolution = timer->hw.resolution; 699 700 /* loop for all active instances 701 * Here we cannot use list_for_each_entry because the active_list of a 702 * processed instance is relinked to done_list_head before the callback 703 * is called. 704 */ 705 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 706 active_list) { 707 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 708 continue; 709 ti->pticks += ticks_left; 710 ti->resolution = resolution; 711 if (ti->cticks < ticks_left) 712 ti->cticks = 0; 713 else 714 ti->cticks -= ticks_left; 715 if (ti->cticks) /* not expired */ 716 continue; 717 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 718 ti->cticks = ti->ticks; 719 } else { 720 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 721 if (--timer->running) 722 list_del_init(&ti->active_list); 723 } 724 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 725 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 726 ack_list_head = &timer->ack_list_head; 727 else 728 ack_list_head = &timer->sack_list_head; 729 if (list_empty(&ti->ack_list)) 730 list_add_tail(&ti->ack_list, ack_list_head); 731 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 732 ts->pticks = ti->pticks; 733 ts->resolution = resolution; 734 if (list_empty(&ts->ack_list)) 735 list_add_tail(&ts->ack_list, ack_list_head); 736 } 737 } 738 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 739 snd_timer_reschedule(timer, timer->sticks); 740 if (timer->running) { 741 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 742 timer->hw.stop(timer); 743 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 744 } 745 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 746 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 747 /* restart timer */ 748 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 749 timer->hw.start(timer); 750 } 751 } else { 752 timer->hw.stop(timer); 753 } 754 755 /* now process all fast callbacks */ 756 while (!list_empty(&timer->ack_list_head)) { 757 p = timer->ack_list_head.next; /* get first item */ 758 ti = list_entry(p, struct snd_timer_instance, ack_list); 759 760 /* remove from ack_list and make empty */ 761 list_del_init(p); 762 763 ticks = ti->pticks; 764 ti->pticks = 0; 765 766 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 767 spin_unlock(&timer->lock); 768 if (ti->callback) 769 ti->callback(ti, resolution, ticks); 770 spin_lock(&timer->lock); 771 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 772 } 773 774 /* do we have any slow callbacks? */ 775 use_tasklet = !list_empty(&timer->sack_list_head); 776 spin_unlock_irqrestore(&timer->lock, flags); 777 778 if (use_tasklet) 779 tasklet_schedule(&timer->task_queue); 780 } 781 782 /* 783 784 */ 785 786 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 787 struct snd_timer **rtimer) 788 { 789 struct snd_timer *timer; 790 int err; 791 static struct snd_device_ops ops = { 792 .dev_free = snd_timer_dev_free, 793 .dev_register = snd_timer_dev_register, 794 .dev_disconnect = snd_timer_dev_disconnect, 795 }; 796 797 if (snd_BUG_ON(!tid)) 798 return -EINVAL; 799 if (rtimer) 800 *rtimer = NULL; 801 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 802 if (!timer) 803 return -ENOMEM; 804 timer->tmr_class = tid->dev_class; 805 timer->card = card; 806 timer->tmr_device = tid->device; 807 timer->tmr_subdevice = tid->subdevice; 808 if (id) 809 strlcpy(timer->id, id, sizeof(timer->id)); 810 INIT_LIST_HEAD(&timer->device_list); 811 INIT_LIST_HEAD(&timer->open_list_head); 812 INIT_LIST_HEAD(&timer->active_list_head); 813 INIT_LIST_HEAD(&timer->ack_list_head); 814 INIT_LIST_HEAD(&timer->sack_list_head); 815 spin_lock_init(&timer->lock); 816 tasklet_init(&timer->task_queue, snd_timer_tasklet, 817 (unsigned long)timer); 818 if (card != NULL) { 819 timer->module = card->module; 820 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 821 if (err < 0) { 822 snd_timer_free(timer); 823 return err; 824 } 825 } 826 if (rtimer) 827 *rtimer = timer; 828 return 0; 829 } 830 831 static int snd_timer_free(struct snd_timer *timer) 832 { 833 if (!timer) 834 return 0; 835 836 mutex_lock(®ister_mutex); 837 if (! list_empty(&timer->open_list_head)) { 838 struct list_head *p, *n; 839 struct snd_timer_instance *ti; 840 pr_warn("ALSA: timer %p is busy?\n", timer); 841 list_for_each_safe(p, n, &timer->open_list_head) { 842 list_del_init(p); 843 ti = list_entry(p, struct snd_timer_instance, open_list); 844 ti->timer = NULL; 845 } 846 } 847 list_del(&timer->device_list); 848 mutex_unlock(®ister_mutex); 849 850 if (timer->private_free) 851 timer->private_free(timer); 852 kfree(timer); 853 return 0; 854 } 855 856 static int snd_timer_dev_free(struct snd_device *device) 857 { 858 struct snd_timer *timer = device->device_data; 859 return snd_timer_free(timer); 860 } 861 862 static int snd_timer_dev_register(struct snd_device *dev) 863 { 864 struct snd_timer *timer = dev->device_data; 865 struct snd_timer *timer1; 866 867 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 868 return -ENXIO; 869 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 870 !timer->hw.resolution && timer->hw.c_resolution == NULL) 871 return -EINVAL; 872 873 mutex_lock(®ister_mutex); 874 list_for_each_entry(timer1, &snd_timer_list, device_list) { 875 if (timer1->tmr_class > timer->tmr_class) 876 break; 877 if (timer1->tmr_class < timer->tmr_class) 878 continue; 879 if (timer1->card && timer->card) { 880 if (timer1->card->number > timer->card->number) 881 break; 882 if (timer1->card->number < timer->card->number) 883 continue; 884 } 885 if (timer1->tmr_device > timer->tmr_device) 886 break; 887 if (timer1->tmr_device < timer->tmr_device) 888 continue; 889 if (timer1->tmr_subdevice > timer->tmr_subdevice) 890 break; 891 if (timer1->tmr_subdevice < timer->tmr_subdevice) 892 continue; 893 /* conflicts.. */ 894 mutex_unlock(®ister_mutex); 895 return -EBUSY; 896 } 897 list_add_tail(&timer->device_list, &timer1->device_list); 898 mutex_unlock(®ister_mutex); 899 return 0; 900 } 901 902 static int snd_timer_dev_disconnect(struct snd_device *device) 903 { 904 struct snd_timer *timer = device->device_data; 905 struct snd_timer_instance *ti; 906 907 mutex_lock(®ister_mutex); 908 list_del_init(&timer->device_list); 909 /* wake up pending sleepers */ 910 list_for_each_entry(ti, &timer->open_list_head, open_list) { 911 if (ti->disconnect) 912 ti->disconnect(ti); 913 } 914 mutex_unlock(®ister_mutex); 915 return 0; 916 } 917 918 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 919 { 920 unsigned long flags; 921 unsigned long resolution = 0; 922 struct snd_timer_instance *ti, *ts; 923 924 if (timer->card && timer->card->shutdown) 925 return; 926 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 927 return; 928 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 929 event > SNDRV_TIMER_EVENT_MRESUME)) 930 return; 931 spin_lock_irqsave(&timer->lock, flags); 932 if (event == SNDRV_TIMER_EVENT_MSTART || 933 event == SNDRV_TIMER_EVENT_MCONTINUE || 934 event == SNDRV_TIMER_EVENT_MRESUME) { 935 if (timer->hw.c_resolution) 936 resolution = timer->hw.c_resolution(timer); 937 else 938 resolution = timer->hw.resolution; 939 } 940 list_for_each_entry(ti, &timer->active_list_head, active_list) { 941 if (ti->ccallback) 942 ti->ccallback(ti, event, tstamp, resolution); 943 list_for_each_entry(ts, &ti->slave_active_head, active_list) 944 if (ts->ccallback) 945 ts->ccallback(ts, event, tstamp, resolution); 946 } 947 spin_unlock_irqrestore(&timer->lock, flags); 948 } 949 950 /* 951 * exported functions for global timers 952 */ 953 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 954 { 955 struct snd_timer_id tid; 956 957 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 958 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 959 tid.card = -1; 960 tid.device = device; 961 tid.subdevice = 0; 962 return snd_timer_new(NULL, id, &tid, rtimer); 963 } 964 965 int snd_timer_global_free(struct snd_timer *timer) 966 { 967 return snd_timer_free(timer); 968 } 969 970 int snd_timer_global_register(struct snd_timer *timer) 971 { 972 struct snd_device dev; 973 974 memset(&dev, 0, sizeof(dev)); 975 dev.device_data = timer; 976 return snd_timer_dev_register(&dev); 977 } 978 979 /* 980 * System timer 981 */ 982 983 struct snd_timer_system_private { 984 struct timer_list tlist; 985 unsigned long last_expires; 986 unsigned long last_jiffies; 987 unsigned long correction; 988 }; 989 990 static void snd_timer_s_function(unsigned long data) 991 { 992 struct snd_timer *timer = (struct snd_timer *)data; 993 struct snd_timer_system_private *priv = timer->private_data; 994 unsigned long jiff = jiffies; 995 if (time_after(jiff, priv->last_expires)) 996 priv->correction += (long)jiff - (long)priv->last_expires; 997 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 998 } 999 1000 static int snd_timer_s_start(struct snd_timer * timer) 1001 { 1002 struct snd_timer_system_private *priv; 1003 unsigned long njiff; 1004 1005 priv = (struct snd_timer_system_private *) timer->private_data; 1006 njiff = (priv->last_jiffies = jiffies); 1007 if (priv->correction > timer->sticks - 1) { 1008 priv->correction -= timer->sticks - 1; 1009 njiff++; 1010 } else { 1011 njiff += timer->sticks - priv->correction; 1012 priv->correction = 0; 1013 } 1014 priv->last_expires = priv->tlist.expires = njiff; 1015 add_timer(&priv->tlist); 1016 return 0; 1017 } 1018 1019 static int snd_timer_s_stop(struct snd_timer * timer) 1020 { 1021 struct snd_timer_system_private *priv; 1022 unsigned long jiff; 1023 1024 priv = (struct snd_timer_system_private *) timer->private_data; 1025 del_timer(&priv->tlist); 1026 jiff = jiffies; 1027 if (time_before(jiff, priv->last_expires)) 1028 timer->sticks = priv->last_expires - jiff; 1029 else 1030 timer->sticks = 1; 1031 priv->correction = 0; 1032 return 0; 1033 } 1034 1035 static struct snd_timer_hardware snd_timer_system = 1036 { 1037 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1038 .resolution = 1000000000L / HZ, 1039 .ticks = 10000000L, 1040 .start = snd_timer_s_start, 1041 .stop = snd_timer_s_stop 1042 }; 1043 1044 static void snd_timer_free_system(struct snd_timer *timer) 1045 { 1046 kfree(timer->private_data); 1047 } 1048 1049 static int snd_timer_register_system(void) 1050 { 1051 struct snd_timer *timer; 1052 struct snd_timer_system_private *priv; 1053 int err; 1054 1055 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1056 if (err < 0) 1057 return err; 1058 strcpy(timer->name, "system timer"); 1059 timer->hw = snd_timer_system; 1060 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1061 if (priv == NULL) { 1062 snd_timer_free(timer); 1063 return -ENOMEM; 1064 } 1065 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer); 1066 timer->private_data = priv; 1067 timer->private_free = snd_timer_free_system; 1068 return snd_timer_global_register(timer); 1069 } 1070 1071 #ifdef CONFIG_SND_PROC_FS 1072 /* 1073 * Info interface 1074 */ 1075 1076 static void snd_timer_proc_read(struct snd_info_entry *entry, 1077 struct snd_info_buffer *buffer) 1078 { 1079 struct snd_timer *timer; 1080 struct snd_timer_instance *ti; 1081 1082 mutex_lock(®ister_mutex); 1083 list_for_each_entry(timer, &snd_timer_list, device_list) { 1084 if (timer->card && timer->card->shutdown) 1085 continue; 1086 switch (timer->tmr_class) { 1087 case SNDRV_TIMER_CLASS_GLOBAL: 1088 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1089 break; 1090 case SNDRV_TIMER_CLASS_CARD: 1091 snd_iprintf(buffer, "C%i-%i: ", 1092 timer->card->number, timer->tmr_device); 1093 break; 1094 case SNDRV_TIMER_CLASS_PCM: 1095 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1096 timer->tmr_device, timer->tmr_subdevice); 1097 break; 1098 default: 1099 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1100 timer->card ? timer->card->number : -1, 1101 timer->tmr_device, timer->tmr_subdevice); 1102 } 1103 snd_iprintf(buffer, "%s :", timer->name); 1104 if (timer->hw.resolution) 1105 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1106 timer->hw.resolution / 1000, 1107 timer->hw.resolution % 1000, 1108 timer->hw.ticks); 1109 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1110 snd_iprintf(buffer, " SLAVE"); 1111 snd_iprintf(buffer, "\n"); 1112 list_for_each_entry(ti, &timer->open_list_head, open_list) 1113 snd_iprintf(buffer, " Client %s : %s\n", 1114 ti->owner ? ti->owner : "unknown", 1115 ti->flags & (SNDRV_TIMER_IFLG_START | 1116 SNDRV_TIMER_IFLG_RUNNING) 1117 ? "running" : "stopped"); 1118 } 1119 mutex_unlock(®ister_mutex); 1120 } 1121 1122 static struct snd_info_entry *snd_timer_proc_entry; 1123 1124 static void __init snd_timer_proc_init(void) 1125 { 1126 struct snd_info_entry *entry; 1127 1128 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1129 if (entry != NULL) { 1130 entry->c.text.read = snd_timer_proc_read; 1131 if (snd_info_register(entry) < 0) { 1132 snd_info_free_entry(entry); 1133 entry = NULL; 1134 } 1135 } 1136 snd_timer_proc_entry = entry; 1137 } 1138 1139 static void __exit snd_timer_proc_done(void) 1140 { 1141 snd_info_free_entry(snd_timer_proc_entry); 1142 } 1143 #else /* !CONFIG_SND_PROC_FS */ 1144 #define snd_timer_proc_init() 1145 #define snd_timer_proc_done() 1146 #endif 1147 1148 /* 1149 * USER SPACE interface 1150 */ 1151 1152 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1153 unsigned long resolution, 1154 unsigned long ticks) 1155 { 1156 struct snd_timer_user *tu = timeri->callback_data; 1157 struct snd_timer_read *r; 1158 int prev; 1159 1160 spin_lock(&tu->qlock); 1161 if (tu->qused > 0) { 1162 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1163 r = &tu->queue[prev]; 1164 if (r->resolution == resolution) { 1165 r->ticks += ticks; 1166 goto __wake; 1167 } 1168 } 1169 if (tu->qused >= tu->queue_size) { 1170 tu->overrun++; 1171 } else { 1172 r = &tu->queue[tu->qtail++]; 1173 tu->qtail %= tu->queue_size; 1174 r->resolution = resolution; 1175 r->ticks = ticks; 1176 tu->qused++; 1177 } 1178 __wake: 1179 spin_unlock(&tu->qlock); 1180 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1181 wake_up(&tu->qchange_sleep); 1182 } 1183 1184 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1185 struct snd_timer_tread *tread) 1186 { 1187 if (tu->qused >= tu->queue_size) { 1188 tu->overrun++; 1189 } else { 1190 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1191 tu->qtail %= tu->queue_size; 1192 tu->qused++; 1193 } 1194 } 1195 1196 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1197 int event, 1198 struct timespec *tstamp, 1199 unsigned long resolution) 1200 { 1201 struct snd_timer_user *tu = timeri->callback_data; 1202 struct snd_timer_tread r1; 1203 unsigned long flags; 1204 1205 if (event >= SNDRV_TIMER_EVENT_START && 1206 event <= SNDRV_TIMER_EVENT_PAUSE) 1207 tu->tstamp = *tstamp; 1208 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1209 return; 1210 r1.event = event; 1211 r1.tstamp = *tstamp; 1212 r1.val = resolution; 1213 spin_lock_irqsave(&tu->qlock, flags); 1214 snd_timer_user_append_to_tqueue(tu, &r1); 1215 spin_unlock_irqrestore(&tu->qlock, flags); 1216 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1217 wake_up(&tu->qchange_sleep); 1218 } 1219 1220 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri) 1221 { 1222 struct snd_timer_user *tu = timeri->callback_data; 1223 1224 tu->disconnected = true; 1225 wake_up(&tu->qchange_sleep); 1226 } 1227 1228 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1229 unsigned long resolution, 1230 unsigned long ticks) 1231 { 1232 struct snd_timer_user *tu = timeri->callback_data; 1233 struct snd_timer_tread *r, r1; 1234 struct timespec tstamp; 1235 int prev, append = 0; 1236 1237 memset(&tstamp, 0, sizeof(tstamp)); 1238 spin_lock(&tu->qlock); 1239 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1240 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1241 spin_unlock(&tu->qlock); 1242 return; 1243 } 1244 if (tu->last_resolution != resolution || ticks > 0) { 1245 if (timer_tstamp_monotonic) 1246 ktime_get_ts(&tstamp); 1247 else 1248 getnstimeofday(&tstamp); 1249 } 1250 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1251 tu->last_resolution != resolution) { 1252 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1253 r1.tstamp = tstamp; 1254 r1.val = resolution; 1255 snd_timer_user_append_to_tqueue(tu, &r1); 1256 tu->last_resolution = resolution; 1257 append++; 1258 } 1259 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1260 goto __wake; 1261 if (ticks == 0) 1262 goto __wake; 1263 if (tu->qused > 0) { 1264 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1265 r = &tu->tqueue[prev]; 1266 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1267 r->tstamp = tstamp; 1268 r->val += ticks; 1269 append++; 1270 goto __wake; 1271 } 1272 } 1273 r1.event = SNDRV_TIMER_EVENT_TICK; 1274 r1.tstamp = tstamp; 1275 r1.val = ticks; 1276 snd_timer_user_append_to_tqueue(tu, &r1); 1277 append++; 1278 __wake: 1279 spin_unlock(&tu->qlock); 1280 if (append == 0) 1281 return; 1282 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1283 wake_up(&tu->qchange_sleep); 1284 } 1285 1286 static int snd_timer_user_open(struct inode *inode, struct file *file) 1287 { 1288 struct snd_timer_user *tu; 1289 int err; 1290 1291 err = nonseekable_open(inode, file); 1292 if (err < 0) 1293 return err; 1294 1295 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1296 if (tu == NULL) 1297 return -ENOMEM; 1298 spin_lock_init(&tu->qlock); 1299 init_waitqueue_head(&tu->qchange_sleep); 1300 mutex_init(&tu->ioctl_lock); 1301 tu->ticks = 1; 1302 tu->queue_size = 128; 1303 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1304 GFP_KERNEL); 1305 if (tu->queue == NULL) { 1306 kfree(tu); 1307 return -ENOMEM; 1308 } 1309 file->private_data = tu; 1310 return 0; 1311 } 1312 1313 static int snd_timer_user_release(struct inode *inode, struct file *file) 1314 { 1315 struct snd_timer_user *tu; 1316 1317 if (file->private_data) { 1318 tu = file->private_data; 1319 file->private_data = NULL; 1320 mutex_lock(&tu->ioctl_lock); 1321 if (tu->timeri) 1322 snd_timer_close(tu->timeri); 1323 mutex_unlock(&tu->ioctl_lock); 1324 kfree(tu->queue); 1325 kfree(tu->tqueue); 1326 kfree(tu); 1327 } 1328 return 0; 1329 } 1330 1331 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1332 { 1333 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1334 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1335 id->card = -1; 1336 id->device = -1; 1337 id->subdevice = -1; 1338 } 1339 1340 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1341 { 1342 id->dev_class = timer->tmr_class; 1343 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1344 id->card = timer->card ? timer->card->number : -1; 1345 id->device = timer->tmr_device; 1346 id->subdevice = timer->tmr_subdevice; 1347 } 1348 1349 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1350 { 1351 struct snd_timer_id id; 1352 struct snd_timer *timer; 1353 struct list_head *p; 1354 1355 if (copy_from_user(&id, _tid, sizeof(id))) 1356 return -EFAULT; 1357 mutex_lock(®ister_mutex); 1358 if (id.dev_class < 0) { /* first item */ 1359 if (list_empty(&snd_timer_list)) 1360 snd_timer_user_zero_id(&id); 1361 else { 1362 timer = list_entry(snd_timer_list.next, 1363 struct snd_timer, device_list); 1364 snd_timer_user_copy_id(&id, timer); 1365 } 1366 } else { 1367 switch (id.dev_class) { 1368 case SNDRV_TIMER_CLASS_GLOBAL: 1369 id.device = id.device < 0 ? 0 : id.device + 1; 1370 list_for_each(p, &snd_timer_list) { 1371 timer = list_entry(p, struct snd_timer, device_list); 1372 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1373 snd_timer_user_copy_id(&id, timer); 1374 break; 1375 } 1376 if (timer->tmr_device >= id.device) { 1377 snd_timer_user_copy_id(&id, timer); 1378 break; 1379 } 1380 } 1381 if (p == &snd_timer_list) 1382 snd_timer_user_zero_id(&id); 1383 break; 1384 case SNDRV_TIMER_CLASS_CARD: 1385 case SNDRV_TIMER_CLASS_PCM: 1386 if (id.card < 0) { 1387 id.card = 0; 1388 } else { 1389 if (id.card < 0) { 1390 id.card = 0; 1391 } else { 1392 if (id.device < 0) { 1393 id.device = 0; 1394 } else { 1395 if (id.subdevice < 0) { 1396 id.subdevice = 0; 1397 } else { 1398 id.subdevice++; 1399 } 1400 } 1401 } 1402 } 1403 list_for_each(p, &snd_timer_list) { 1404 timer = list_entry(p, struct snd_timer, device_list); 1405 if (timer->tmr_class > id.dev_class) { 1406 snd_timer_user_copy_id(&id, timer); 1407 break; 1408 } 1409 if (timer->tmr_class < id.dev_class) 1410 continue; 1411 if (timer->card->number > id.card) { 1412 snd_timer_user_copy_id(&id, timer); 1413 break; 1414 } 1415 if (timer->card->number < id.card) 1416 continue; 1417 if (timer->tmr_device > id.device) { 1418 snd_timer_user_copy_id(&id, timer); 1419 break; 1420 } 1421 if (timer->tmr_device < id.device) 1422 continue; 1423 if (timer->tmr_subdevice > id.subdevice) { 1424 snd_timer_user_copy_id(&id, timer); 1425 break; 1426 } 1427 if (timer->tmr_subdevice < id.subdevice) 1428 continue; 1429 snd_timer_user_copy_id(&id, timer); 1430 break; 1431 } 1432 if (p == &snd_timer_list) 1433 snd_timer_user_zero_id(&id); 1434 break; 1435 default: 1436 snd_timer_user_zero_id(&id); 1437 } 1438 } 1439 mutex_unlock(®ister_mutex); 1440 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1441 return -EFAULT; 1442 return 0; 1443 } 1444 1445 static int snd_timer_user_ginfo(struct file *file, 1446 struct snd_timer_ginfo __user *_ginfo) 1447 { 1448 struct snd_timer_ginfo *ginfo; 1449 struct snd_timer_id tid; 1450 struct snd_timer *t; 1451 struct list_head *p; 1452 int err = 0; 1453 1454 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1455 if (IS_ERR(ginfo)) 1456 return PTR_ERR(ginfo); 1457 1458 tid = ginfo->tid; 1459 memset(ginfo, 0, sizeof(*ginfo)); 1460 ginfo->tid = tid; 1461 mutex_lock(®ister_mutex); 1462 t = snd_timer_find(&tid); 1463 if (t != NULL) { 1464 ginfo->card = t->card ? t->card->number : -1; 1465 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1466 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1467 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1468 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1469 ginfo->resolution = t->hw.resolution; 1470 if (t->hw.resolution_min > 0) { 1471 ginfo->resolution_min = t->hw.resolution_min; 1472 ginfo->resolution_max = t->hw.resolution_max; 1473 } 1474 list_for_each(p, &t->open_list_head) { 1475 ginfo->clients++; 1476 } 1477 } else { 1478 err = -ENODEV; 1479 } 1480 mutex_unlock(®ister_mutex); 1481 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1482 err = -EFAULT; 1483 kfree(ginfo); 1484 return err; 1485 } 1486 1487 static int snd_timer_user_gparams(struct file *file, 1488 struct snd_timer_gparams __user *_gparams) 1489 { 1490 struct snd_timer_gparams gparams; 1491 struct snd_timer *t; 1492 int err; 1493 1494 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1495 return -EFAULT; 1496 mutex_lock(®ister_mutex); 1497 t = snd_timer_find(&gparams.tid); 1498 if (!t) { 1499 err = -ENODEV; 1500 goto _error; 1501 } 1502 if (!list_empty(&t->open_list_head)) { 1503 err = -EBUSY; 1504 goto _error; 1505 } 1506 if (!t->hw.set_period) { 1507 err = -ENOSYS; 1508 goto _error; 1509 } 1510 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1511 _error: 1512 mutex_unlock(®ister_mutex); 1513 return err; 1514 } 1515 1516 static int snd_timer_user_gstatus(struct file *file, 1517 struct snd_timer_gstatus __user *_gstatus) 1518 { 1519 struct snd_timer_gstatus gstatus; 1520 struct snd_timer_id tid; 1521 struct snd_timer *t; 1522 int err = 0; 1523 1524 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1525 return -EFAULT; 1526 tid = gstatus.tid; 1527 memset(&gstatus, 0, sizeof(gstatus)); 1528 gstatus.tid = tid; 1529 mutex_lock(®ister_mutex); 1530 t = snd_timer_find(&tid); 1531 if (t != NULL) { 1532 if (t->hw.c_resolution) 1533 gstatus.resolution = t->hw.c_resolution(t); 1534 else 1535 gstatus.resolution = t->hw.resolution; 1536 if (t->hw.precise_resolution) { 1537 t->hw.precise_resolution(t, &gstatus.resolution_num, 1538 &gstatus.resolution_den); 1539 } else { 1540 gstatus.resolution_num = gstatus.resolution; 1541 gstatus.resolution_den = 1000000000uL; 1542 } 1543 } else { 1544 err = -ENODEV; 1545 } 1546 mutex_unlock(®ister_mutex); 1547 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1548 err = -EFAULT; 1549 return err; 1550 } 1551 1552 static int snd_timer_user_tselect(struct file *file, 1553 struct snd_timer_select __user *_tselect) 1554 { 1555 struct snd_timer_user *tu; 1556 struct snd_timer_select tselect; 1557 char str[32]; 1558 int err = 0; 1559 1560 tu = file->private_data; 1561 if (tu->timeri) { 1562 snd_timer_close(tu->timeri); 1563 tu->timeri = NULL; 1564 } 1565 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1566 err = -EFAULT; 1567 goto __err; 1568 } 1569 sprintf(str, "application %i", current->pid); 1570 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1571 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1572 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1573 if (err < 0) 1574 goto __err; 1575 1576 kfree(tu->queue); 1577 tu->queue = NULL; 1578 kfree(tu->tqueue); 1579 tu->tqueue = NULL; 1580 if (tu->tread) { 1581 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1582 GFP_KERNEL); 1583 if (tu->tqueue == NULL) 1584 err = -ENOMEM; 1585 } else { 1586 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1587 GFP_KERNEL); 1588 if (tu->queue == NULL) 1589 err = -ENOMEM; 1590 } 1591 1592 if (err < 0) { 1593 snd_timer_close(tu->timeri); 1594 tu->timeri = NULL; 1595 } else { 1596 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1597 tu->timeri->callback = tu->tread 1598 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1599 tu->timeri->ccallback = snd_timer_user_ccallback; 1600 tu->timeri->callback_data = (void *)tu; 1601 tu->timeri->disconnect = snd_timer_user_disconnect; 1602 } 1603 1604 __err: 1605 return err; 1606 } 1607 1608 static int snd_timer_user_info(struct file *file, 1609 struct snd_timer_info __user *_info) 1610 { 1611 struct snd_timer_user *tu; 1612 struct snd_timer_info *info; 1613 struct snd_timer *t; 1614 int err = 0; 1615 1616 tu = file->private_data; 1617 if (!tu->timeri) 1618 return -EBADFD; 1619 t = tu->timeri->timer; 1620 if (!t) 1621 return -EBADFD; 1622 1623 info = kzalloc(sizeof(*info), GFP_KERNEL); 1624 if (! info) 1625 return -ENOMEM; 1626 info->card = t->card ? t->card->number : -1; 1627 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1628 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1629 strlcpy(info->id, t->id, sizeof(info->id)); 1630 strlcpy(info->name, t->name, sizeof(info->name)); 1631 info->resolution = t->hw.resolution; 1632 if (copy_to_user(_info, info, sizeof(*_info))) 1633 err = -EFAULT; 1634 kfree(info); 1635 return err; 1636 } 1637 1638 static int snd_timer_user_params(struct file *file, 1639 struct snd_timer_params __user *_params) 1640 { 1641 struct snd_timer_user *tu; 1642 struct snd_timer_params params; 1643 struct snd_timer *t; 1644 struct snd_timer_read *tr; 1645 struct snd_timer_tread *ttr; 1646 int err; 1647 1648 tu = file->private_data; 1649 if (!tu->timeri) 1650 return -EBADFD; 1651 t = tu->timeri->timer; 1652 if (!t) 1653 return -EBADFD; 1654 if (copy_from_user(¶ms, _params, sizeof(params))) 1655 return -EFAULT; 1656 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1657 err = -EINVAL; 1658 goto _end; 1659 } 1660 if (params.queue_size > 0 && 1661 (params.queue_size < 32 || params.queue_size > 1024)) { 1662 err = -EINVAL; 1663 goto _end; 1664 } 1665 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1666 (1<<SNDRV_TIMER_EVENT_TICK)| 1667 (1<<SNDRV_TIMER_EVENT_START)| 1668 (1<<SNDRV_TIMER_EVENT_STOP)| 1669 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1670 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1671 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1672 (1<<SNDRV_TIMER_EVENT_RESUME)| 1673 (1<<SNDRV_TIMER_EVENT_MSTART)| 1674 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1675 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1676 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1677 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1678 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1679 err = -EINVAL; 1680 goto _end; 1681 } 1682 snd_timer_stop(tu->timeri); 1683 spin_lock_irq(&t->lock); 1684 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1685 SNDRV_TIMER_IFLG_EXCLUSIVE| 1686 SNDRV_TIMER_IFLG_EARLY_EVENT); 1687 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1688 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1689 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1690 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1691 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1692 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1693 spin_unlock_irq(&t->lock); 1694 if (params.queue_size > 0 && 1695 (unsigned int)tu->queue_size != params.queue_size) { 1696 if (tu->tread) { 1697 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1698 GFP_KERNEL); 1699 if (ttr) { 1700 kfree(tu->tqueue); 1701 tu->queue_size = params.queue_size; 1702 tu->tqueue = ttr; 1703 } 1704 } else { 1705 tr = kmalloc(params.queue_size * sizeof(*tr), 1706 GFP_KERNEL); 1707 if (tr) { 1708 kfree(tu->queue); 1709 tu->queue_size = params.queue_size; 1710 tu->queue = tr; 1711 } 1712 } 1713 } 1714 tu->qhead = tu->qtail = tu->qused = 0; 1715 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1716 if (tu->tread) { 1717 struct snd_timer_tread tread; 1718 tread.event = SNDRV_TIMER_EVENT_EARLY; 1719 tread.tstamp.tv_sec = 0; 1720 tread.tstamp.tv_nsec = 0; 1721 tread.val = 0; 1722 snd_timer_user_append_to_tqueue(tu, &tread); 1723 } else { 1724 struct snd_timer_read *r = &tu->queue[0]; 1725 r->resolution = 0; 1726 r->ticks = 0; 1727 tu->qused++; 1728 tu->qtail++; 1729 } 1730 } 1731 tu->filter = params.filter; 1732 tu->ticks = params.ticks; 1733 err = 0; 1734 _end: 1735 if (copy_to_user(_params, ¶ms, sizeof(params))) 1736 return -EFAULT; 1737 return err; 1738 } 1739 1740 static int snd_timer_user_status(struct file *file, 1741 struct snd_timer_status __user *_status) 1742 { 1743 struct snd_timer_user *tu; 1744 struct snd_timer_status status; 1745 1746 tu = file->private_data; 1747 if (!tu->timeri) 1748 return -EBADFD; 1749 memset(&status, 0, sizeof(status)); 1750 status.tstamp = tu->tstamp; 1751 status.resolution = snd_timer_resolution(tu->timeri); 1752 status.lost = tu->timeri->lost; 1753 status.overrun = tu->overrun; 1754 spin_lock_irq(&tu->qlock); 1755 status.queue = tu->qused; 1756 spin_unlock_irq(&tu->qlock); 1757 if (copy_to_user(_status, &status, sizeof(status))) 1758 return -EFAULT; 1759 return 0; 1760 } 1761 1762 static int snd_timer_user_start(struct file *file) 1763 { 1764 int err; 1765 struct snd_timer_user *tu; 1766 1767 tu = file->private_data; 1768 if (!tu->timeri) 1769 return -EBADFD; 1770 snd_timer_stop(tu->timeri); 1771 tu->timeri->lost = 0; 1772 tu->last_resolution = 0; 1773 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1774 } 1775 1776 static int snd_timer_user_stop(struct file *file) 1777 { 1778 int err; 1779 struct snd_timer_user *tu; 1780 1781 tu = file->private_data; 1782 if (!tu->timeri) 1783 return -EBADFD; 1784 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1785 } 1786 1787 static int snd_timer_user_continue(struct file *file) 1788 { 1789 int err; 1790 struct snd_timer_user *tu; 1791 1792 tu = file->private_data; 1793 if (!tu->timeri) 1794 return -EBADFD; 1795 tu->timeri->lost = 0; 1796 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1797 } 1798 1799 static int snd_timer_user_pause(struct file *file) 1800 { 1801 int err; 1802 struct snd_timer_user *tu; 1803 1804 tu = file->private_data; 1805 if (!tu->timeri) 1806 return -EBADFD; 1807 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1808 } 1809 1810 enum { 1811 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1812 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1813 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1814 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1815 }; 1816 1817 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1818 unsigned long arg) 1819 { 1820 struct snd_timer_user *tu; 1821 void __user *argp = (void __user *)arg; 1822 int __user *p = argp; 1823 1824 tu = file->private_data; 1825 switch (cmd) { 1826 case SNDRV_TIMER_IOCTL_PVERSION: 1827 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1828 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1829 return snd_timer_user_next_device(argp); 1830 case SNDRV_TIMER_IOCTL_TREAD: 1831 { 1832 int xarg; 1833 1834 if (tu->timeri) /* too late */ 1835 return -EBUSY; 1836 if (get_user(xarg, p)) 1837 return -EFAULT; 1838 tu->tread = xarg ? 1 : 0; 1839 return 0; 1840 } 1841 case SNDRV_TIMER_IOCTL_GINFO: 1842 return snd_timer_user_ginfo(file, argp); 1843 case SNDRV_TIMER_IOCTL_GPARAMS: 1844 return snd_timer_user_gparams(file, argp); 1845 case SNDRV_TIMER_IOCTL_GSTATUS: 1846 return snd_timer_user_gstatus(file, argp); 1847 case SNDRV_TIMER_IOCTL_SELECT: 1848 return snd_timer_user_tselect(file, argp); 1849 case SNDRV_TIMER_IOCTL_INFO: 1850 return snd_timer_user_info(file, argp); 1851 case SNDRV_TIMER_IOCTL_PARAMS: 1852 return snd_timer_user_params(file, argp); 1853 case SNDRV_TIMER_IOCTL_STATUS: 1854 return snd_timer_user_status(file, argp); 1855 case SNDRV_TIMER_IOCTL_START: 1856 case SNDRV_TIMER_IOCTL_START_OLD: 1857 return snd_timer_user_start(file); 1858 case SNDRV_TIMER_IOCTL_STOP: 1859 case SNDRV_TIMER_IOCTL_STOP_OLD: 1860 return snd_timer_user_stop(file); 1861 case SNDRV_TIMER_IOCTL_CONTINUE: 1862 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1863 return snd_timer_user_continue(file); 1864 case SNDRV_TIMER_IOCTL_PAUSE: 1865 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1866 return snd_timer_user_pause(file); 1867 } 1868 return -ENOTTY; 1869 } 1870 1871 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1872 unsigned long arg) 1873 { 1874 struct snd_timer_user *tu = file->private_data; 1875 long ret; 1876 1877 mutex_lock(&tu->ioctl_lock); 1878 ret = __snd_timer_user_ioctl(file, cmd, arg); 1879 mutex_unlock(&tu->ioctl_lock); 1880 return ret; 1881 } 1882 1883 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1884 { 1885 struct snd_timer_user *tu; 1886 1887 tu = file->private_data; 1888 return fasync_helper(fd, file, on, &tu->fasync); 1889 } 1890 1891 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1892 size_t count, loff_t *offset) 1893 { 1894 struct snd_timer_user *tu; 1895 long result = 0, unit; 1896 int err = 0; 1897 1898 tu = file->private_data; 1899 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1900 spin_lock_irq(&tu->qlock); 1901 while ((long)count - result >= unit) { 1902 while (!tu->qused) { 1903 wait_queue_t wait; 1904 1905 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1906 err = -EAGAIN; 1907 break; 1908 } 1909 1910 set_current_state(TASK_INTERRUPTIBLE); 1911 init_waitqueue_entry(&wait, current); 1912 add_wait_queue(&tu->qchange_sleep, &wait); 1913 1914 spin_unlock_irq(&tu->qlock); 1915 schedule(); 1916 spin_lock_irq(&tu->qlock); 1917 1918 remove_wait_queue(&tu->qchange_sleep, &wait); 1919 1920 if (tu->disconnected) { 1921 err = -ENODEV; 1922 break; 1923 } 1924 if (signal_pending(current)) { 1925 err = -ERESTARTSYS; 1926 break; 1927 } 1928 } 1929 1930 spin_unlock_irq(&tu->qlock); 1931 if (err < 0) 1932 goto _error; 1933 1934 if (tu->tread) { 1935 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1936 sizeof(struct snd_timer_tread))) { 1937 err = -EFAULT; 1938 goto _error; 1939 } 1940 } else { 1941 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1942 sizeof(struct snd_timer_read))) { 1943 err = -EFAULT; 1944 goto _error; 1945 } 1946 } 1947 1948 tu->qhead %= tu->queue_size; 1949 1950 result += unit; 1951 buffer += unit; 1952 1953 spin_lock_irq(&tu->qlock); 1954 tu->qused--; 1955 } 1956 spin_unlock_irq(&tu->qlock); 1957 _error: 1958 return result > 0 ? result : err; 1959 } 1960 1961 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1962 { 1963 unsigned int mask; 1964 struct snd_timer_user *tu; 1965 1966 tu = file->private_data; 1967 1968 poll_wait(file, &tu->qchange_sleep, wait); 1969 1970 mask = 0; 1971 if (tu->qused) 1972 mask |= POLLIN | POLLRDNORM; 1973 if (tu->disconnected) 1974 mask |= POLLERR; 1975 1976 return mask; 1977 } 1978 1979 #ifdef CONFIG_COMPAT 1980 #include "timer_compat.c" 1981 #else 1982 #define snd_timer_user_ioctl_compat NULL 1983 #endif 1984 1985 static const struct file_operations snd_timer_f_ops = 1986 { 1987 .owner = THIS_MODULE, 1988 .read = snd_timer_user_read, 1989 .open = snd_timer_user_open, 1990 .release = snd_timer_user_release, 1991 .llseek = no_llseek, 1992 .poll = snd_timer_user_poll, 1993 .unlocked_ioctl = snd_timer_user_ioctl, 1994 .compat_ioctl = snd_timer_user_ioctl_compat, 1995 .fasync = snd_timer_user_fasync, 1996 }; 1997 1998 /* unregister the system timer */ 1999 static void snd_timer_free_all(void) 2000 { 2001 struct snd_timer *timer, *n; 2002 2003 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list) 2004 snd_timer_free(timer); 2005 } 2006 2007 static struct device timer_dev; 2008 2009 /* 2010 * ENTRY functions 2011 */ 2012 2013 static int __init alsa_timer_init(void) 2014 { 2015 int err; 2016 2017 snd_device_initialize(&timer_dev, NULL); 2018 dev_set_name(&timer_dev, "timer"); 2019 2020 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2021 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 2022 "system timer"); 2023 #endif 2024 2025 err = snd_timer_register_system(); 2026 if (err < 0) { 2027 pr_err("ALSA: unable to register system timer (%i)\n", err); 2028 put_device(&timer_dev); 2029 return err; 2030 } 2031 2032 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 2033 &snd_timer_f_ops, NULL, &timer_dev); 2034 if (err < 0) { 2035 pr_err("ALSA: unable to register timer device (%i)\n", err); 2036 snd_timer_free_all(); 2037 put_device(&timer_dev); 2038 return err; 2039 } 2040 2041 snd_timer_proc_init(); 2042 return 0; 2043 } 2044 2045 static void __exit alsa_timer_exit(void) 2046 { 2047 snd_unregister_device(&timer_dev); 2048 snd_timer_free_all(); 2049 put_device(&timer_dev); 2050 snd_timer_proc_done(); 2051 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2052 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 2053 #endif 2054 } 2055 2056 module_init(alsa_timer_init) 2057 module_exit(alsa_timer_exit) 2058 2059 EXPORT_SYMBOL(snd_timer_open); 2060 EXPORT_SYMBOL(snd_timer_close); 2061 EXPORT_SYMBOL(snd_timer_resolution); 2062 EXPORT_SYMBOL(snd_timer_start); 2063 EXPORT_SYMBOL(snd_timer_stop); 2064 EXPORT_SYMBOL(snd_timer_continue); 2065 EXPORT_SYMBOL(snd_timer_pause); 2066 EXPORT_SYMBOL(snd_timer_new); 2067 EXPORT_SYMBOL(snd_timer_notify); 2068 EXPORT_SYMBOL(snd_timer_global_new); 2069 EXPORT_SYMBOL(snd_timer_global_free); 2070 EXPORT_SYMBOL(snd_timer_global_register); 2071 EXPORT_SYMBOL(snd_timer_interrupt); 2072