| changeset 5876: | 2d6164f0bf0e |
| parent: | d773ad622068 |
| author: | tiwai |
| date: | Tue Feb 19 11:56:06 2008 +0100 (4 years ago) |
| permissions: | -rw-r--r-- |
| description: | Dont touch fs_struct in drivers The sound drivers and the pnpbios core test for current->root != NULL. This test seems to be unnecessary since we always have rootfs mounted before initializing the drivers. Patch-level: Merged Signed-off-by: Jan Blunck <jblunck@suse.de> Acked-by: Christoph Hellwig <hch@lst.de> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: Jaroslav Kysela <perex@suse.cz> Acked-by: Takashi Iwai <tiwai@suse.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
1/*2 * Timers abstract layer3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>4 *5 *6 * This program is free software; you can redistribute it and/or modify7 * it under the terms of the GNU General Public License as published by8 * the Free Software Foundation; either version 2 of the License, or9 * (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 of13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the14 * GNU General Public License for more details.15 *16 * You should have received a copy of the GNU General Public License17 * along with this program; if not, write to the Free Software18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA19 *20 */2122#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>3637#if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)38#define DEFAULT_TIMER_LIMIT 339#elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)40#define DEFAULT_TIMER_LIMIT 241#else42#define DEFAULT_TIMER_LIMIT 143#endif4445static int timer_limit = DEFAULT_TIMER_LIMIT;46static int timer_tstamp_monotonic = 1;47MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");48MODULE_DESCRIPTION("ALSA timer interface");49MODULE_LICENSE("GPL");50module_param(timer_limit, int, 0444);51MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");52module_param(timer_tstamp_monotonic, int, 0444);53MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");5455struct snd_timer_user {56 struct snd_timer_instance *timeri;57 int tread; /* enhanced read with timestamps and events */58 unsigned long ticks;59 unsigned long overrun;60 int qhead;61 int qtail;62 int qused;63 int queue_size;64 struct snd_timer_read *queue;65 struct snd_timer_tread *tqueue;66 spinlock_t qlock;67 unsigned long last_resolution;68 unsigned int filter;69 struct timespec tstamp; /* trigger tstamp */70 wait_queue_head_t qchange_sleep;71 struct fasync_struct *fasync;72 struct mutex tread_sem;73};7475/* list of timers */76static LIST_HEAD(snd_timer_list);7778/* list of slave instances */79static LIST_HEAD(snd_timer_slave_list);8081/* lock for slave active lists */82static DEFINE_SPINLOCK(slave_active_lock);8384static DEFINE_MUTEX(register_mutex);8586static int snd_timer_free(struct snd_timer *timer);87static int snd_timer_dev_free(struct snd_device *device);88static int snd_timer_dev_register(struct snd_device *device);89static int snd_timer_dev_disconnect(struct snd_device *device);9091static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);9293/*94 * create a timer instance with the given owner string.95 * when timer is not NULL, increments the module counter96 */97static struct snd_timer_instance *snd_timer_instance_new(char *owner,98 struct snd_timer *timer)99{100 struct snd_timer_instance *timeri;101 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);102 if (timeri == NULL)103 return NULL;104 timeri->owner = kstrdup(owner, GFP_KERNEL);105 if (! timeri->owner) {106 kfree(timeri);107 return NULL;108 }109 INIT_LIST_HEAD(&timeri->open_list);110 INIT_LIST_HEAD(&timeri->active_list);111 INIT_LIST_HEAD(&timeri->ack_list);112 INIT_LIST_HEAD(&timeri->slave_list_head);113 INIT_LIST_HEAD(&timeri->slave_active_head);114115 timeri->timer = timer;116 if (timer && !try_module_get(timer->module)) {117 kfree(timeri->owner);118 kfree(timeri);119 return NULL;120 }121122 return timeri;123}124125/*126 * find a timer instance from the given timer id127 */128static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)129{130 struct snd_timer *timer = NULL;131132 list_for_each_entry(timer, &snd_timer_list, device_list) {133 if (timer->tmr_class != tid->dev_class)134 continue;135 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||136 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&137 (timer->card == NULL ||138 timer->card->number != tid->card))139 continue;140 if (timer->tmr_device != tid->device)141 continue;142 if (timer->tmr_subdevice != tid->subdevice)143 continue;144 return timer;145 }146 return NULL;147}148149#ifdef CONFIG_KMOD150151static void snd_timer_request(struct snd_timer_id *tid)152{153 switch (tid->dev_class) {154 case SNDRV_TIMER_CLASS_GLOBAL:155 if (tid->device < timer_limit)156 request_module("snd-timer-%i", tid->device);157 break;158 case SNDRV_TIMER_CLASS_CARD:159 case SNDRV_TIMER_CLASS_PCM:160 if (tid->card < snd_ecards_limit)161 request_module("snd-card-%i", tid->card);162 break;163 default:164 break;165 }166}167168#endif169170/*171 * look for a master instance matching with the slave id of the given slave.172 * when found, relink the open_link of the slave.173 *174 * call this with register_mutex down.175 */176static void snd_timer_check_slave(struct snd_timer_instance *slave)177{178 struct snd_timer *timer;179 struct snd_timer_instance *master;180181 /* FIXME: it's really dumb to look up all entries.. */182 list_for_each_entry(timer, &snd_timer_list, device_list) {183 list_for_each_entry(master, &timer->open_list_head, open_list) {184 if (slave->slave_class == master->slave_class &&185 slave->slave_id == master->slave_id) {186 list_del(&slave->open_list);187 list_add_tail(&slave->open_list,188 &master->slave_list_head);189 spin_lock_irq(&slave_active_lock);190 slave->master = master;191 slave->timer = master->timer;192 spin_unlock_irq(&slave_active_lock);193 return;194 }195 }196 }197}198199/*200 * look for slave instances matching with the slave id of the given master.201 * when found, relink the open_link of slaves.202 *203 * call this with register_mutex down.204 */205static void snd_timer_check_master(struct snd_timer_instance *master)206{207 struct snd_timer_instance *slave, *tmp;208209 /* check all pending slaves */210 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {211 if (slave->slave_class == master->slave_class &&212 slave->slave_id == master->slave_id) {213 list_move_tail(&slave->open_list, &master->slave_list_head);214 spin_lock_irq(&slave_active_lock);215 slave->master = master;216 slave->timer = master->timer;217 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)218 list_add_tail(&slave->active_list,219 &master->slave_active_head);220 spin_unlock_irq(&slave_active_lock);221 }222 }223}224225/*226 * open a timer instance227 * when opening a master, the slave id must be here given.228 */229int snd_timer_open(struct snd_timer_instance **ti,230 char *owner, struct snd_timer_id *tid,231 unsigned int slave_id)232{233 struct snd_timer *timer;234 struct snd_timer_instance *timeri = NULL;235236 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {237 /* open a slave instance */238 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||239 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {240 snd_printd("invalid slave class %i\n", tid->dev_sclass);241 return -EINVAL;242 }243 mutex_lock(®ister_mutex);244 timeri = snd_timer_instance_new(owner, NULL);245 if (!timeri) {246 mutex_unlock(®ister_mutex);247 return -ENOMEM;248 }249 timeri->slave_class = tid->dev_sclass;250 timeri->slave_id = tid->device;251 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;252 list_add_tail(&timeri->open_list, &snd_timer_slave_list);253 snd_timer_check_slave(timeri);254 mutex_unlock(®ister_mutex);255 *ti = timeri;256 return 0;257 }258259 /* open a master instance */260 mutex_lock(®ister_mutex);261 timer = snd_timer_find(tid);262#ifdef CONFIG_KMOD263 if (timer == NULL) {264 mutex_unlock(®ister_mutex);265 snd_timer_request(tid);266 mutex_lock(®ister_mutex);267 timer = snd_timer_find(tid);268 }269#endif270 if (!timer) {271 mutex_unlock(®ister_mutex);272 return -ENODEV;273 }274 if (!list_empty(&timer->open_list_head)) {275 timeri = list_entry(timer->open_list_head.next,276 struct snd_timer_instance, open_list);277 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {278 mutex_unlock(®ister_mutex);279 return -EBUSY;280 }281 }282 timeri = snd_timer_instance_new(owner, timer);283 if (!timeri) {284 mutex_unlock(®ister_mutex);285 return -ENOMEM;286 }287 timeri->slave_class = tid->dev_sclass;288 timeri->slave_id = slave_id;289 if (list_empty(&timer->open_list_head) && timer->hw.open)290 timer->hw.open(timer);291 list_add_tail(&timeri->open_list, &timer->open_list_head);292 snd_timer_check_master(timeri);293 mutex_unlock(®ister_mutex);294 *ti = timeri;295 return 0;296}297298static int _snd_timer_stop(struct snd_timer_instance *timeri,299 int keep_flag, int event);300301/*302 * close a timer instance303 */304int snd_timer_close(struct snd_timer_instance *timeri)305{306 struct snd_timer *timer = NULL;307 struct snd_timer_instance *slave, *tmp;308309 snd_assert(timeri != NULL, return -ENXIO);310311 /* force to stop the timer */312 snd_timer_stop(timeri);313314 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {315 /* wait, until the active callback is finished */316 spin_lock_irq(&slave_active_lock);317 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {318 spin_unlock_irq(&slave_active_lock);319 udelay(10);320 spin_lock_irq(&slave_active_lock);321 }322 spin_unlock_irq(&slave_active_lock);323 mutex_lock(®ister_mutex);324 list_del(&timeri->open_list);325 mutex_unlock(®ister_mutex);326 } else {327 timer = timeri->timer;328 /* wait, until the active callback is finished */329 spin_lock_irq(&timer->lock);330 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {331 spin_unlock_irq(&timer->lock);332 udelay(10);333 spin_lock_irq(&timer->lock);334 }335 spin_unlock_irq(&timer->lock);336 mutex_lock(®ister_mutex);337 list_del(&timeri->open_list);338 if (timer && list_empty(&timer->open_list_head) &&339 timer->hw.close)340 timer->hw.close(timer);341 /* remove slave links */342 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,343 open_list) {344 spin_lock_irq(&slave_active_lock);345 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);346 list_move_tail(&slave->open_list, &snd_timer_slave_list);347 slave->master = NULL;348 slave->timer = NULL;349 spin_unlock_irq(&slave_active_lock);350 }351 mutex_unlock(®ister_mutex);352 }353 if (timeri->private_free)354 timeri->private_free(timeri);355 kfree(timeri->owner);356 kfree(timeri);357 if (timer)358 module_put(timer->module);359 return 0;360}361362unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)363{364 struct snd_timer * timer;365366 if (timeri == NULL)367 return 0;368 if ((timer = timeri->timer) != NULL) {369 if (timer->hw.c_resolution)370 return timer->hw.c_resolution(timer);371 return timer->hw.resolution;372 }373 return 0;374}375376static void snd_timer_notify1(struct snd_timer_instance *ti, int event)377{378 struct snd_timer *timer;379 unsigned long flags;380 unsigned long resolution = 0;381 struct snd_timer_instance *ts;382 struct timespec tstamp;383384 if (timer_tstamp_monotonic)385 do_posix_clock_monotonic_gettime(&tstamp);386 else387 getnstimeofday(&tstamp);388 snd_assert(event >= SNDRV_TIMER_EVENT_START &&389 event <= SNDRV_TIMER_EVENT_PAUSE, return);390 if (event == SNDRV_TIMER_EVENT_START ||391 event == SNDRV_TIMER_EVENT_CONTINUE)392 resolution = snd_timer_resolution(ti);393 if (ti->ccallback)394 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);395 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)396 return;397 timer = ti->timer;398 if (timer == NULL)399 return;400 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)401 return;402 spin_lock_irqsave(&timer->lock, flags);403 list_for_each_entry(ts, &ti->slave_active_head, active_list)404 if (ts->ccallback)405 ts->ccallback(ti, event + 100, &tstamp, resolution);406 spin_unlock_irqrestore(&timer->lock, flags);407}408409static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,410 unsigned long sticks)411{412 list_del(&timeri->active_list);413 list_add_tail(&timeri->active_list, &timer->active_list_head);414 if (timer->running) {415 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)416 goto __start_now;417 timer->flags |= SNDRV_TIMER_FLG_RESCHED;418 timeri->flags |= SNDRV_TIMER_IFLG_START;419 return 1; /* delayed start */420 } else {421 timer->sticks = sticks;422 timer->hw.start(timer);423 __start_now:424 timer->running++;425 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;426 return 0;427 }428}429430static int snd_timer_start_slave(struct snd_timer_instance *timeri)431{432 unsigned long flags;433434 spin_lock_irqsave(&slave_active_lock, flags);435 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;436 if (timeri->master)437 list_add_tail(&timeri->active_list,438 &timeri->master->slave_active_head);439 spin_unlock_irqrestore(&slave_active_lock, flags);440 return 1; /* delayed start */441}442443/*444 * start the timer instance445 */446int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)447{448 struct snd_timer *timer;449 int result = -EINVAL;450 unsigned long flags;451452 if (timeri == NULL || ticks < 1)453 return -EINVAL;454 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {455 result = snd_timer_start_slave(timeri);456 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);457 return result;458 }459 timer = timeri->timer;460 if (timer == NULL)461 return -EINVAL;462 spin_lock_irqsave(&timer->lock, flags);463 timeri->ticks = timeri->cticks = ticks;464 timeri->pticks = 0;465 result = snd_timer_start1(timer, timeri, ticks);466 spin_unlock_irqrestore(&timer->lock, flags);467 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);468 return result;469}470471static int _snd_timer_stop(struct snd_timer_instance * timeri,472 int keep_flag, int event)473{474 struct snd_timer *timer;475 unsigned long flags;476477 snd_assert(timeri != NULL, return -ENXIO);478479 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {480 if (!keep_flag) {481 spin_lock_irqsave(&slave_active_lock, flags);482 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;483 spin_unlock_irqrestore(&slave_active_lock, flags);484 }485 goto __end;486 }487 timer = timeri->timer;488 if (!timer)489 return -EINVAL;490 spin_lock_irqsave(&timer->lock, flags);491 list_del_init(&timeri->ack_list);492 list_del_init(&timeri->active_list);493 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&494 !(--timer->running)) {495 timer->hw.stop(timer);496 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {497 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;498 snd_timer_reschedule(timer, 0);499 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {500 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;501 timer->hw.start(timer);502 }503 }504 }505 if (!keep_flag)506 timeri->flags &=507 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);508 spin_unlock_irqrestore(&timer->lock, flags);509 __end:510 if (event != SNDRV_TIMER_EVENT_RESOLUTION)511 snd_timer_notify1(timeri, event);512 return 0;513}514515/*516 * stop the timer instance.517 *518 * do not call this from the timer callback!519 */520int snd_timer_stop(struct snd_timer_instance *timeri)521{522 struct snd_timer *timer;523 unsigned long flags;524 int err;525526 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);527 if (err < 0)528 return err;529 timer = timeri->timer;530 spin_lock_irqsave(&timer->lock, flags);531 timeri->cticks = timeri->ticks;532 timeri->pticks = 0;533 spin_unlock_irqrestore(&timer->lock, flags);534 return 0;535}536537/*538 * start again.. the tick is kept.539 */540int snd_timer_continue(struct snd_timer_instance *timeri)541{542 struct snd_timer *timer;543 int result = -EINVAL;544 unsigned long flags;545546 if (timeri == NULL)547 return result;548 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)549 return snd_timer_start_slave(timeri);550 timer = timeri->timer;551 if (! timer)552 return -EINVAL;553 spin_lock_irqsave(&timer->lock, flags);554 if (!timeri->cticks)555 timeri->cticks = 1;556 timeri->pticks = 0;557 result = snd_timer_start1(timer, timeri, timer->sticks);558 spin_unlock_irqrestore(&timer->lock, flags);559 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);560 return result;561}562563/*564 * pause.. remember the ticks left565 */566int snd_timer_pause(struct snd_timer_instance * timeri)567{568 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);569}570571/*572 * reschedule the timer573 *574 * start pending instances and check the scheduling ticks.575 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.576 */577static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)578{579 struct snd_timer_instance *ti;580 unsigned long ticks = ~0UL;581582 list_for_each_entry(ti, &timer->active_list_head, active_list) {583 if (ti->flags & SNDRV_TIMER_IFLG_START) {584 ti->flags &= ~SNDRV_TIMER_IFLG_START;585 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;586 timer->running++;587 }588 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {589 if (ticks > ti->cticks)590 ticks = ti->cticks;591 }592 }593 if (ticks == ~0UL) {594 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;595 return;596 }597 if (ticks > timer->hw.ticks)598 ticks = timer->hw.ticks;599 if (ticks_left != ticks)600 timer->flags |= SNDRV_TIMER_FLG_CHANGE;601 timer->sticks = ticks;602}603604/*605 * timer tasklet606 *607 */608static void snd_timer_tasklet(unsigned long arg)609{610 struct snd_timer *timer = (struct snd_timer *) arg;611 struct snd_timer_instance *ti;612 struct list_head *p;613 unsigned long resolution, ticks;614 unsigned long flags;615616 spin_lock_irqsave(&timer->lock, flags);617 /* now process all callbacks */618 while (!list_empty(&timer->sack_list_head)) {619 p = timer->sack_list_head.next; /* get first item */620 ti = list_entry(p, struct snd_timer_instance, ack_list);621622 /* remove from ack_list and make empty */623 list_del_init(p);624625 ticks = ti->pticks;626 ti->pticks = 0;627 resolution = ti->resolution;628629 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;630 spin_unlock(&timer->lock);631 if (ti->callback)632 ti->callback(ti, resolution, ticks);633 spin_lock(&timer->lock);634 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;635 }636 spin_unlock_irqrestore(&timer->lock, flags);637}638639/*640 * timer interrupt641 *642 * ticks_left is usually equal to timer->sticks.643 *644 */645void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)646{647 struct snd_timer_instance *ti, *ts, *tmp;648 unsigned long resolution, ticks;649 struct list_head *p, *ack_list_head;650 unsigned long flags;651 int use_tasklet = 0;652653 if (timer == NULL)654 return;655656 spin_lock_irqsave(&timer->lock, flags);657658 /* remember the current resolution */659 if (timer->hw.c_resolution)660 resolution = timer->hw.c_resolution(timer);661 else662 resolution = timer->hw.resolution;663664 /* loop for all active instances665 * Here we cannot use list_for_each_entry because the active_list of a666 * processed instance is relinked to done_list_head before the callback667 * is called.668 */669 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,670 active_list) {671 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))672 continue;673 ti->pticks += ticks_left;674 ti->resolution = resolution;675 if (ti->cticks < ticks_left)676 ti->cticks = 0;677 else678 ti->cticks -= ticks_left;679 if (ti->cticks) /* not expired */680 continue;681 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {682 ti->cticks = ti->ticks;683 } else {684 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;685 if (--timer->running)686 list_del(&ti->active_list);687 }688 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||689 (ti->flags & SNDRV_TIMER_IFLG_FAST))690 ack_list_head = &timer->ack_list_head;691 else692 ack_list_head = &timer->sack_list_head;693 if (list_empty(&ti->ack_list))694 list_add_tail(&ti->ack_list, ack_list_head);695 list_for_each_entry(ts, &ti->slave_active_head, active_list) {696 ts->pticks = ti->pticks;697 ts->resolution = resolution;698 if (list_empty(&ts->ack_list))699 list_add_tail(&ts->ack_list, ack_list_head);700 }701 }702 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)703 snd_timer_reschedule(timer, timer->sticks);704 if (timer->running) {705 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {706 timer->hw.stop(timer);707 timer->flags |= SNDRV_TIMER_FLG_CHANGE;708 }709 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||710 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {711 /* restart timer */712 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;713 timer->hw.start(timer);714 }715 } else {716 timer->hw.stop(timer);717 }718719 /* now process all fast callbacks */720 while (!list_empty(&timer->ack_list_head)) {721 p = timer->ack_list_head.next; /* get first item */722 ti = list_entry(p, struct snd_timer_instance, ack_list);723724 /* remove from ack_list and make empty */725 list_del_init(p);726727 ticks = ti->pticks;728 ti->pticks = 0;729730 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;731 spin_unlock(&timer->lock);732 if (ti->callback)733 ti->callback(ti, resolution, ticks);734 spin_lock(&timer->lock);735 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;736 }737738 /* do we have any slow callbacks? */739 use_tasklet = !list_empty(&timer->sack_list_head);740 spin_unlock_irqrestore(&timer->lock, flags);741742 if (use_tasklet)743 tasklet_hi_schedule(&timer->task_queue);744}745746/*747748 */749750int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,751 struct snd_timer **rtimer)752{753 struct snd_timer *timer;754 int err;755 static struct snd_device_ops ops = {756 .dev_free = snd_timer_dev_free,757 .dev_register = snd_timer_dev_register,758 .dev_disconnect = snd_timer_dev_disconnect,759 };760761 snd_assert(tid != NULL, return -EINVAL);762 snd_assert(rtimer != NULL, return -EINVAL);763 *rtimer = NULL;764 timer = kzalloc(sizeof(*timer), GFP_KERNEL);765 if (timer == NULL) {766 snd_printk(KERN_ERR "timer: cannot allocate\n");767 return -ENOMEM;768 }769 timer->tmr_class = tid->dev_class;770 timer->card = card;771 timer->tmr_device = tid->device;772 timer->tmr_subdevice = tid->subdevice;773 if (id)774 strlcpy(timer->id, id, sizeof(timer->id));775 INIT_LIST_HEAD(&timer->device_list);776 INIT_LIST_HEAD(&timer->open_list_head);777 INIT_LIST_HEAD(&timer->active_list_head);778 INIT_LIST_HEAD(&timer->ack_list_head);779 INIT_LIST_HEAD(&timer->sack_list_head);780 spin_lock_init(&timer->lock);781 tasklet_init(&timer->task_queue, snd_timer_tasklet,782 (unsigned long)timer);783 if (card != NULL) {784 timer->module = card->module;785 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);786 if (err < 0) {787 snd_timer_free(timer);788 return err;789 }790 }791 *rtimer = timer;792 return 0;793}794795static int snd_timer_free(struct snd_timer *timer)796{797 snd_assert(timer != NULL, return -ENXIO);798799 mutex_lock(®ister_mutex);800 if (! list_empty(&timer->open_list_head)) {801 struct list_head *p, *n;802 struct snd_timer_instance *ti;803 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);804 list_for_each_safe(p, n, &timer->open_list_head) {805 list_del_init(p);806 ti = list_entry(p, struct snd_timer_instance, open_list);807 ti->timer = NULL;808 }809 }810 list_del(&timer->device_list);811 mutex_unlock(®ister_mutex);812813 if (timer->private_free)814 timer->private_free(timer);815 kfree(timer);816 return 0;817}818819static int snd_timer_dev_free(struct snd_device *device)820{821 struct snd_timer *timer = device->device_data;822 return snd_timer_free(timer);823}824825static int snd_timer_dev_register(struct snd_device *dev)826{827 struct snd_timer *timer = dev->device_data;828 struct snd_timer *timer1;829830 snd_assert(timer != NULL && timer->hw.start != NULL &&831 timer->hw.stop != NULL, return -ENXIO);832 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&833 !timer->hw.resolution && timer->hw.c_resolution == NULL)834 return -EINVAL;835836 mutex_lock(®ister_mutex);837 list_for_each_entry(timer1, &snd_timer_list, device_list) {838 if (timer1->tmr_class > timer->tmr_class)839 break;840 if (timer1->tmr_class < timer->tmr_class)841 continue;842 if (timer1->card && timer->card) {843 if (timer1->card->number > timer->card->number)844 break;845 if (timer1->card->number < timer->card->number)846 continue;847 }848 if (timer1->tmr_device > timer->tmr_device)849 break;850 if (timer1->tmr_device < timer->tmr_device)851 continue;852 if (timer1->tmr_subdevice > timer->tmr_subdevice)853 break;854 if (timer1->tmr_subdevice < timer->tmr_subdevice)855 continue;856 /* conflicts.. */857 mutex_unlock(®ister_mutex);858 return -EBUSY;859 }860 list_add_tail(&timer->device_list, &timer1->device_list);861 mutex_unlock(®ister_mutex);862 return 0;863}864865static int snd_timer_dev_disconnect(struct snd_device *device)866{867 struct snd_timer *timer = device->device_data;868 mutex_lock(®ister_mutex);869 list_del_init(&timer->device_list);870 mutex_unlock(®ister_mutex);871 return 0;872}873874void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)875{876 unsigned long flags;877 unsigned long resolution = 0;878 struct snd_timer_instance *ti, *ts;879880 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))881 return;882 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&883 event <= SNDRV_TIMER_EVENT_MRESUME, return);884 spin_lock_irqsave(&timer->lock, flags);885 if (event == SNDRV_TIMER_EVENT_MSTART ||886 event == SNDRV_TIMER_EVENT_MCONTINUE ||887 event == SNDRV_TIMER_EVENT_MRESUME) {888 if (timer->hw.c_resolution)889 resolution = timer->hw.c_resolution(timer);890 else891 resolution = timer->hw.resolution;892 }893 list_for_each_entry(ti, &timer->active_list_head, active_list) {894 if (ti->ccallback)895 ti->ccallback(ti, event, tstamp, resolution);896 list_for_each_entry(ts, &ti->slave_active_head, active_list)897 if (ts->ccallback)898 ts->ccallback(ts, event, tstamp, resolution);899 }900 spin_unlock_irqrestore(&timer->lock, flags);901}902903/*904 * exported functions for global timers905 */906int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)907{908 struct snd_timer_id tid;909910 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;911 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;912 tid.card = -1;913 tid.device = device;914 tid.subdevice = 0;915 return snd_timer_new(NULL, id, &tid, rtimer);916}917918int snd_timer_global_free(struct snd_timer *timer)919{920 return snd_timer_free(timer);921}922923int snd_timer_global_register(struct snd_timer *timer)924{925 struct snd_device dev;926927 memset(&dev, 0, sizeof(dev));928 dev.device_data = timer;929 return snd_timer_dev_register(&dev);930}931932/*933 * System timer934 */935936struct snd_timer_system_private {937 struct timer_list tlist;938 unsigned long last_expires;939 unsigned long last_jiffies;940 unsigned long correction;941};942943static void snd_timer_s_function(unsigned long data)944{945 struct snd_timer *timer = (struct snd_timer *)data;946 struct snd_timer_system_private *priv = timer->private_data;947 unsigned long jiff = jiffies;948 if (time_after(jiff, priv->last_expires))949 priv->correction += (long)jiff - (long)priv->last_expires;950 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);951}952953static int snd_timer_s_start(struct snd_timer * timer)954{955 struct snd_timer_system_private *priv;956 unsigned long njiff;957958 priv = (struct snd_timer_system_private *) timer->private_data;959 njiff = (priv->last_jiffies = jiffies);960 if (priv->correction > timer->sticks - 1) {961 priv->correction -= timer->sticks - 1;962 njiff++;963 } else {964 njiff += timer->sticks - priv->correction;965 priv->correction = 0;966 }967 priv->last_expires = priv->tlist.expires = njiff;968 add_timer(&priv->tlist);969 return 0;970}971972static int snd_timer_s_stop(struct snd_timer * timer)973{974 struct snd_timer_system_private *priv;975 unsigned long jiff;976977 priv = (struct snd_timer_system_private *) timer->private_data;978 del_timer(&priv->tlist);979 jiff = jiffies;980 if (time_before(jiff, priv->last_expires))981 timer->sticks = priv->last_expires - jiff;982 else983 timer->sticks = 1;984 priv->correction = 0;985 return 0;986}987988static struct snd_timer_hardware snd_timer_system =989{990 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,991 .resolution = 1000000000L / HZ,992 .ticks = 10000000L,993 .start = snd_timer_s_start,994 .stop = snd_timer_s_stop995};996997static void snd_timer_free_system(struct snd_timer *timer)998{999 kfree(timer->private_data);1000}10011002static int snd_timer_register_system(void)1003{1004 struct snd_timer *timer;1005 struct snd_timer_system_private *priv;1006 int err;10071008 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);1009 if (err < 0)1010 return err;1011 strcpy(timer->name, "system timer");1012 timer->hw = snd_timer_system;1013 priv = kzalloc(sizeof(*priv), GFP_KERNEL);1014 if (priv == NULL) {1015 snd_timer_free(timer);1016 return -ENOMEM;1017 }1018 init_timer(&priv->tlist);1019 priv->tlist.function = snd_timer_s_function;1020 priv->tlist.data = (unsigned long) timer;1021 timer->private_data = priv;1022 timer->private_free = snd_timer_free_system;1023 return snd_timer_global_register(timer);1024}10251026#ifdef CONFIG_PROC_FS1027/*1028 * Info interface1029 */10301031static void snd_timer_proc_read(struct snd_info_entry *entry,1032 struct snd_info_buffer *buffer)1033{1034 struct snd_timer *timer;1035 struct snd_timer_instance *ti;10361037 mutex_lock(®ister_mutex);1038 list_for_each_entry(timer, &snd_timer_list, device_list) {1039 switch (timer->tmr_class) {1040 case SNDRV_TIMER_CLASS_GLOBAL:1041 snd_iprintf(buffer, "G%i: ", timer->tmr_device);1042 break;1043 case SNDRV_TIMER_CLASS_CARD:1044 snd_iprintf(buffer, "C%i-%i: ",1045 timer->card->number, timer->tmr_device);1046 break;1047 case SNDRV_TIMER_CLASS_PCM:1048 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,1049 timer->tmr_device, timer->tmr_subdevice);1050 break;1051 default:1052 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,1053 timer->card ? timer->card->number : -1,1054 timer->tmr_device, timer->tmr_subdevice);1055 }1056 snd_iprintf(buffer, "%s :", timer->name);1057 if (timer->hw.resolution)1058 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",1059 timer->hw.resolution / 1000,1060 timer->hw.resolution % 1000,1061 timer->hw.ticks);1062 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)1063 snd_iprintf(buffer, " SLAVE");1064 snd_iprintf(buffer, "\n");1065 list_for_each_entry(ti, &timer->open_list_head, open_list)1066 snd_iprintf(buffer, " Client %s : %s\n",1067 ti->owner ? ti->owner : "unknown",1068 ti->flags & (SNDRV_TIMER_IFLG_START |1069 SNDRV_TIMER_IFLG_RUNNING)1070 ? "running" : "stopped");1071 }1072 mutex_unlock(®ister_mutex);1073}10741075static struct snd_info_entry *snd_timer_proc_entry;10761077static void __init snd_timer_proc_init(void)1078{1079 struct snd_info_entry *entry;10801081 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);1082 if (entry != NULL) {1083 entry->c.text.read = snd_timer_proc_read;1084 if (snd_info_register(entry) < 0) {1085 snd_info_free_entry(entry);1086 entry = NULL;1087 }1088 }1089 snd_timer_proc_entry = entry;1090}10911092static void __exit snd_timer_proc_done(void)1093{1094 snd_info_free_entry(snd_timer_proc_entry);1095}1096#else /* !CONFIG_PROC_FS */1097#define snd_timer_proc_init()1098#define snd_timer_proc_done()1099#endif11001101/*1102 * USER SPACE interface1103 */11041105static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,1106 unsigned long resolution,1107 unsigned long ticks)1108{1109 struct snd_timer_user *tu = timeri->callback_data;1110 struct snd_timer_read *r;1111 int prev;11121113 spin_lock(&tu->qlock);1114 if (tu->qused > 0) {1115 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;1116 r = &tu->queue[prev];1117 if (r->resolution == resolution) {1118 r->ticks += ticks;1119 goto __wake;1120 }1121 }1122 if (tu->qused >= tu->queue_size) {1123 tu->overrun++;1124 } else {1125 r = &tu->queue[tu->qtail++];1126 tu->qtail %= tu->queue_size;1127 r->resolution = resolution;1128 r->ticks = ticks;1129 tu->qused++;1130 }1131 __wake:1132 spin_unlock(&tu->qlock);1133 kill_fasync(&tu->fasync, SIGIO, POLL_IN);1134 wake_up(&tu->qchange_sleep);1135}11361137static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,1138 struct snd_timer_tread *tread)1139{1140 if (tu->qused >= tu->queue_size) {1141 tu->overrun++;1142 } else {1143 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));1144 tu->qtail %= tu->queue_size;1145 tu->qused++;1146 }1147}11481149static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,1150 int event,1151 struct timespec *tstamp,1152 unsigned long resolution)1153{1154 struct snd_timer_user *tu = timeri->callback_data;1155 struct snd_timer_tread r1;11561157 if (event >= SNDRV_TIMER_EVENT_START &&1158 event <= SNDRV_TIMER_EVENT_PAUSE)1159 tu->tstamp = *tstamp;1160 if ((tu->filter & (1 << event)) == 0 || !tu->tread)1161 return;1162 r1.event = event;1163 r1.tstamp = *tstamp;1164 r1.val = resolution;1165 spin_lock(&tu->qlock);1166 snd_timer_user_append_to_tqueue(tu, &r1);1167 spin_unlock(&tu->qlock);1168 kill_fasync(&tu->fasync, SIGIO, POLL_IN);1169 wake_up(&tu->qchange_sleep);1170}11711172static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,1173 unsigned long resolution,1174 unsigned long ticks)1175{1176 struct snd_timer_user *tu = timeri->callback_data;1177 struct snd_timer_tread *r, r1;1178 struct timespec tstamp;1179 int prev, append = 0;11801181 memset(&tstamp, 0, sizeof(tstamp));1182 spin_lock(&tu->qlock);1183 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |1184 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {1185 spin_unlock(&tu->qlock);1186 return;1187 }1188 if (tu->last_resolution != resolution || ticks > 0) {1189 if (timer_tstamp_monotonic)1190 do_posix_clock_monotonic_gettime(&tstamp);1191 else1192 getnstimeofday(&tstamp);1193 }1194 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&1195 tu->last_resolution != resolution) {1196 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;1197 r1.tstamp = tstamp;1198 r1.val = resolution;1199 snd_timer_user_append_to_tqueue(tu, &r1);1200 tu->last_resolution = resolution;1201 append++;1202 }1203 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)1204 goto __wake;1205 if (ticks == 0)1206 goto __wake;1207 if (tu->qused > 0) {1208 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;1209 r = &tu->tqueue[prev];1210 if (r->event == SNDRV_TIMER_EVENT_TICK) {1211 r->tstamp = tstamp;1212 r->val += ticks;1213 append++;1214 goto __wake;1215 }1216 }1217 r1.event = SNDRV_TIMER_EVENT_TICK;1218 r1.tstamp = tstamp;1219 r1.val = ticks;1220 snd_timer_user_append_to_tqueue(tu, &r1);1221 append++;1222 __wake:1223 spin_unlock(&tu->qlock);1224 if (append == 0)1225 return;1226 kill_fasync(&tu->fasync, SIGIO, POLL_IN);1227 wake_up(&tu->qchange_sleep);1228}12291230static int snd_timer_user_open(struct inode *inode, struct file *file)1231{1232 struct snd_timer_user *tu;12331234 tu = kzalloc(sizeof(*tu), GFP_KERNEL);1235 if (tu == NULL)1236 return -ENOMEM;1237 spin_lock_init(&tu->qlock);1238 init_waitqueue_head(&tu->qchange_sleep);1239 mutex_init(&tu->tread_sem);1240 tu->ticks = 1;1241 tu->queue_size = 128;1242 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),1243 GFP_KERNEL);1244 if (tu->queue == NULL) {1245 kfree(tu);1246 return -ENOMEM;1247 }1248 file->private_data = tu;1249 return 0;1250}12511252static int snd_timer_user_release(struct inode *inode, struct file *file)1253{1254 struct snd_timer_user *tu;12551256 if (file->private_data) {1257 tu = file->private_data;1258 file->private_data = NULL;1259 fasync_helper(-1, file, 0, &tu->fasync);1260 if (tu->timeri)1261 snd_timer_close(tu->timeri);1262 kfree(tu->queue);1263 kfree(tu->tqueue);1264 kfree(tu);1265 }1266 return 0;1267}12681269static void snd_timer_user_zero_id(struct snd_timer_id *id)1270{1271 id->dev_class = SNDRV_TIMER_CLASS_NONE;1272 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;1273 id->card = -1;1274 id->device = -1;1275 id->subdevice = -1;1276}12771278static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)1279{1280 id->dev_class = timer->tmr_class;1281 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;1282 id->card = timer->card ? timer->card->number : -1;1283 id->device = timer->tmr_device;1284 id->subdevice = timer->tmr_subdevice;1285}12861287static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)1288{1289 struct snd_timer_id id;1290 struct snd_timer *timer;1291 struct list_head *p;12921293 if (copy_from_user(&id, _tid, sizeof(id)))1294 return -EFAULT;1295 mutex_lock(®ister_mutex);1296 if (id.dev_class < 0) { /* first item */1297 if (list_empty(&snd_timer_list))1298 snd_timer_user_zero_id(&id);1299 else {1300 timer = list_entry(snd_timer_list.next,1301 struct snd_timer, device_list);1302 snd_timer_user_copy_id(&id, timer);1303 }1304 } else {1305 switch (id.dev_class) {1306 case SNDRV_TIMER_CLASS_GLOBAL:1307 id.device = id.device < 0 ? 0 : id.device + 1;1308 list_for_each(p, &snd_timer_list) {1309 timer = list_entry(p, struct snd_timer, device_list);1310 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {1311 snd_timer_user_copy_id(&id, timer);1312 break;1313 }1314 if (timer->tmr_device >= id.device) {1315 snd_timer_user_copy_id(&id, timer);1316 break;1317 }1318 }1319 if (p == &snd_timer_list)1320 snd_timer_user_zero_id(&id);1321 break;1322 case SNDRV_TIMER_CLASS_CARD:1323 case SNDRV_TIMER_CLASS_PCM:1324 if (id.card < 0) {1325 id.card = 0;1326 } else {1327 if (id.card < 0) {1328 id.card = 0;1329 } else {1330 if (id.device < 0) {1331 id.device = 0;1332 } else {1333 if (id.subdevice < 0) {1334 id.subdevice = 0;1335 } else {1336 id.subdevice++;1337 }1338 }1339 }1340 }1341 list_for_each(p, &snd_timer_list) {1342 timer = list_entry(p, struct snd_timer, device_list);1343 if (timer->tmr_class > id.dev_class) {1344 snd_timer_user_copy_id(&id, timer);1345 break;1346 }1347 if (timer->tmr_class < id.dev_class)1348 continue;1349 if (timer->card->number > id.card) {1350 snd_timer_user_copy_id(&id, timer);1351 break;1352 }1353 if (timer->card->number < id.card)1354 continue;1355 if (timer->tmr_device > id.device) {1356 snd_timer_user_copy_id(&id, timer);1357 break;1358 }1359 if (timer->tmr_device < id.device)1360 continue;1361 if (timer->tmr_subdevice > id.subdevice) {1362 snd_timer_user_copy_id(&id, timer);1363 break;1364 }1365 if (timer->tmr_subdevice < id.subdevice)1366 continue;1367 snd_timer_user_copy_id(&id, timer);1368 break;1369 }1370 if (p == &snd_timer_list)1371 snd_timer_user_zero_id(&id);1372 break;1373 default:1374 snd_timer_user_zero_id(&id);1375 }1376 }1377 mutex_unlock(®ister_mutex);1378 if (copy_to_user(_tid, &id, sizeof(*_tid)))1379 return -EFAULT;1380 return 0;1381}13821383static int snd_timer_user_ginfo(struct file *file,1384 struct snd_timer_ginfo __user *_ginfo)1385{1386 struct snd_timer_ginfo *ginfo;1387 struct snd_timer_id tid;1388 struct snd_timer *t;1389 struct list_head *p;1390 int err = 0;13911392 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);1393 if (! ginfo)1394 return -ENOMEM;1395 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {1396 kfree(ginfo);1397 return -EFAULT;1398 }1399 tid = ginfo->tid;1400 memset(ginfo, 0, sizeof(*ginfo));1401 ginfo->tid = tid;1402 mutex_lock(®ister_mutex);1403 t = snd_timer_find(&tid);1404 if (t != NULL) {1405 ginfo->card = t->card ? t->card->number : -1;1406 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)1407 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;1408 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));1409 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));1410 ginfo->resolution = t->hw.resolution;1411 if (t->hw.resolution_min > 0) {1412 ginfo->resolution_min = t->hw.resolution_min;1413 ginfo->resolution_max = t->hw.resolution_max;1414 }1415 list_for_each(p, &t->open_list_head) {1416 ginfo->clients++;1417 }1418 } else {1419 err = -ENODEV;1420 }1421 mutex_unlock(®ister_mutex);1422 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))1423 err = -EFAULT;1424 kfree(ginfo);1425 return err;1426}14271428static int snd_timer_user_gparams(struct file *file,1429 struct snd_timer_gparams __user *_gparams)1430{1431 struct snd_timer_gparams gparams;1432 struct snd_timer *t;1433 int err;14341435 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))1436 return -EFAULT;1437 mutex_lock(®ister_mutex);1438 t = snd_timer_find(&gparams.tid);1439 if (!t) {1440 err = -ENODEV;1441 goto _error;1442 }1443 if (!list_empty(&t->open_list_head)) {1444 err = -EBUSY;1445 goto _error;1446 }1447 if (!t->hw.set_period) {1448 err = -ENOSYS;1449 goto _error;1450 }1451 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);1452_error:1453 mutex_unlock(®ister_mutex);1454 return err;1455}14561457static int snd_timer_user_gstatus(struct file *file,1458 struct snd_timer_gstatus __user *_gstatus)1459{1460 struct snd_timer_gstatus gstatus;1461 struct snd_timer_id tid;1462 struct snd_timer *t;1463 int err = 0;14641465 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))1466 return -EFAULT;1467 tid = gstatus.tid;1468 memset(&gstatus, 0, sizeof(gstatus));1469 gstatus.tid = tid;1470 mutex_lock(®ister_mutex);1471 t = snd_timer_find(&tid);1472 if (t != NULL) {1473 if (t->hw.c_resolution)1474 gstatus.resolution = t->hw.c_resolution(t);1475 else1476 gstatus.resolution = t->hw.resolution;1477 if (t->hw.precise_resolution) {1478 t->hw.precise_resolution(t, &gstatus.resolution_num,1479 &gstatus.resolution_den);1480 } else {1481 gstatus.resolution_num = gstatus.resolution;1482 gstatus.resolution_den = 1000000000uL;1483 }1484 } else {1485 err = -ENODEV;1486 }1487 mutex_unlock(®ister_mutex);1488 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))1489 err = -EFAULT;1490 return err;1491}14921493static int snd_timer_user_tselect(struct file *file,1494 struct snd_timer_select __user *_tselect)1495{1496 struct snd_timer_user *tu;1497 struct snd_timer_select tselect;1498 char str[32];1499 int err = 0;15001501 tu = file->private_data;1502 mutex_lock(&tu->tread_sem);1503 if (tu->timeri) {1504 snd_timer_close(tu->timeri);1505 tu->timeri = NULL;1506 }1507 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {1508 err = -EFAULT;1509 goto __err;1510 }1511 sprintf(str, "application %i", current->pid);1512 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)1513 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;1514 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);1515 if (err < 0)1516 goto __err;15171518 kfree(tu->queue);1519 tu->queue = NULL;1520 kfree(tu->tqueue);1521 tu->tqueue = NULL;1522 if (tu->tread) {1523 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),1524 GFP_KERNEL);1525 if (tu->tqueue == NULL)1526 err = -ENOMEM;1527 } else {1528 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),1529 GFP_KERNEL);1530 if (tu->queue == NULL)1531 err = -ENOMEM;1532 }15331534 if (err < 0) {1535 snd_timer_close(tu->timeri);1536 tu->timeri = NULL;1537 } else {1538 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;1539 tu->timeri->callback = tu->tread1540 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;1541 tu->timeri->ccallback = snd_timer_user_ccallback;1542 tu->timeri->callback_data = (void *)tu;1543 }15441545 __err:1546 mutex_unlock(&tu->tread_sem);1547 return err;1548}15491550static int snd_timer_user_info(struct file *file,1551 struct snd_timer_info __user *_info)1552{1553 struct snd_timer_user *tu;1554 struct snd_timer_info *info;1555 struct snd_timer *t;1556 int err = 0;15571558 tu = file->private_data;1559 if (!tu->timeri)1560 return -EBADFD;1561 t = tu->timeri->timer;1562 if (!t)1563 return -EBADFD;15641565 info = kzalloc(sizeof(*info), GFP_KERNEL);1566 if (! info)1567 return -ENOMEM;1568 info->card = t->card ? t->card->number : -1;1569 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)1570 info->flags |= SNDRV_TIMER_FLG_SLAVE;1571 strlcpy(info->id, t->id, sizeof(info->id));1572 strlcpy(info->name, t->name, sizeof(info->name));1573 info->resolution = t->hw.resolution;1574 if (copy_to_user(_info, info, sizeof(*_info)))1575 err = -EFAULT;1576 kfree(info);1577 return err;1578}15791580static int snd_timer_user_params(struct file *file,1581 struct snd_timer_params __user *_params)1582{1583 struct snd_timer_user *tu;1584 struct snd_timer_params params;1585 struct snd_timer *t;1586 struct snd_timer_read *tr;1587 struct snd_timer_tread *ttr;1588 int err;15891590 tu = file->private_data;1591 if (!tu->timeri)1592 return -EBADFD;1593 t = tu->timeri->timer;1594 if (!t)1595 return -EBADFD;1596 if (copy_from_user(¶ms, _params, sizeof(params)))1597 return -EFAULT;1598 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {1599 err = -EINVAL;1600 goto _end;1601 }1602 if (params.queue_size > 0 &&1603 (params.queue_size < 32 || params.queue_size > 1024)) {1604 err = -EINVAL;1605 goto _end;1606 }1607 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|1608 (1<<SNDRV_TIMER_EVENT_TICK)|1609 (1<<SNDRV_TIMER_EVENT_START)|1610 (1<<SNDRV_TIMER_EVENT_STOP)|1611 (1<<SNDRV_TIMER_EVENT_CONTINUE)|1612 (1<<SNDRV_TIMER_EVENT_PAUSE)|1613 (1<<SNDRV_TIMER_EVENT_SUSPEND)|1614 (1<<SNDRV_TIMER_EVENT_RESUME)|1615 (1<<SNDRV_TIMER_EVENT_MSTART)|1616 (1<<SNDRV_TIMER_EVENT_MSTOP)|1617 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|1618 (1<<SNDRV_TIMER_EVENT_MPAUSE)|1619 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|1620 (1<<SNDRV_TIMER_EVENT_MRESUME))) {1621 err = -EINVAL;1622 goto _end;1623 }1624 snd_timer_stop(tu->timeri);1625 spin_lock_irq(&t->lock);1626 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|1627 SNDRV_TIMER_IFLG_EXCLUSIVE|1628 SNDRV_TIMER_IFLG_EARLY_EVENT);1629 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)1630 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;1631 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)1632 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;1633 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)1634 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;1635 spin_unlock_irq(&t->lock);1636 if (params.queue_size > 0 &&1637 (unsigned int)tu->queue_size != params.queue_size) {1638 if (tu->tread) {1639 ttr = kmalloc(params.queue_size * sizeof(*ttr),1640 GFP_KERNEL);1641 if (ttr) {1642 kfree(tu->tqueue);1643 tu->queue_size = params.queue_size;1644 tu->tqueue = ttr;1645 }1646 } else {1647 tr = kmalloc(params.queue_size * sizeof(*tr),1648 GFP_KERNEL);1649 if (tr) {1650 kfree(tu->queue);1651 tu->queue_size = params.queue_size;1652 tu->queue = tr;1653 }1654 }1655 }1656 tu->qhead = tu->qtail = tu->qused = 0;1657 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {1658 if (tu->tread) {1659 struct snd_timer_tread tread;1660 tread.event = SNDRV_TIMER_EVENT_EARLY;1661 tread.tstamp.tv_sec = 0;1662 tread.tstamp.tv_nsec = 0;1663 tread.val = 0;1664 snd_timer_user_append_to_tqueue(tu, &tread);1665 } else {1666 struct snd_timer_read *r = &tu->queue[0];1667 r->resolution = 0;1668 r->ticks = 0;1669 tu->qused++;1670 tu->qtail++;1671 }1672 }1673 tu->filter = params.filter;1674 tu->ticks = params.ticks;1675 err = 0;1676 _end:1677 if (copy_to_user(_params, ¶ms, sizeof(params)))1678 return -EFAULT;1679 return err;1680}16811682static int snd_timer_user_status(struct file *file,1683 struct snd_timer_status __user *_status)1684{1685 struct snd_timer_user *tu;1686 struct snd_timer_status status;16871688 tu = file->private_data;1689 if (!tu->timeri)1690 return -EBADFD;1691 memset(&status, 0, sizeof(status));1692 status.tstamp = tu->tstamp;1693 status.resolution = snd_timer_resolution(tu->timeri);1694 status.lost = tu->timeri->lost;1695 status.overrun = tu->overrun;1696 spin_lock_irq(&tu->qlock);1697 status.queue = tu->qused;1698 spin_unlock_irq(&tu->qlock);1699 if (copy_to_user(_status, &status, sizeof(status)))1700 return -EFAULT;1701 return 0;1702}17031704static int snd_timer_user_start(struct file *file)1705{1706 int err;1707 struct snd_timer_user *tu;17081709 tu = file->private_data;1710 if (!tu->timeri)1711 return -EBADFD;1712 snd_timer_stop(tu->timeri);1713 tu->timeri->lost = 0;1714 tu->last_resolution = 0;1715 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;1716}17171718static int snd_timer_user_stop(struct file *file)1719{1720 int err;1721 struct snd_timer_user *tu;17221723 tu = file->private_data;1724 if (!tu->timeri)1725 return -EBADFD;1726 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;1727}17281729static int snd_timer_user_continue(struct file *file)1730{1731 int err;1732 struct snd_timer_user *tu;17331734 tu = file->private_data;1735 if (!tu->timeri)1736 return -EBADFD;1737 tu->timeri->lost = 0;1738 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;1739}17401741static int snd_timer_user_pause(struct file *file)1742{1743 int err;1744 struct snd_timer_user *tu;17451746 tu = file->private_data;1747 if (!tu->timeri)1748 return -EBADFD;1749 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;1750}17511752enum {1753 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),1754 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),1755 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),1756 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),1757};17581759static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,1760 unsigned long arg)1761{1762 struct snd_timer_user *tu;1763 void __user *argp = (void __user *)arg;1764 int __user *p = argp;17651766 tu = file->private_data;1767 switch (cmd) {1768 case SNDRV_TIMER_IOCTL_PVERSION:1769 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;1770 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:1771 return snd_timer_user_next_device(argp);1772 case SNDRV_TIMER_IOCTL_TREAD:1773 {1774 int xarg;17751776 mutex_lock(&tu->tread_sem);1777 if (tu->timeri) { /* too late */1778 mutex_unlock(&tu->tread_sem);1779 return -EBUSY;1780 }1781 if (get_user(xarg, p)) {1782 mutex_unlock(&tu->tread_sem);1783 return -EFAULT;1784 }1785 tu->tread = xarg ? 1 : 0;1786 mutex_unlock(&tu->tread_sem);1787 return 0;1788 }1789 case SNDRV_TIMER_IOCTL_GINFO:1790 return snd_timer_user_ginfo(file, argp);1791 case SNDRV_TIMER_IOCTL_GPARAMS:1792 return snd_timer_user_gparams(file, argp);1793 case SNDRV_TIMER_IOCTL_GSTATUS:1794 return snd_timer_user_gstatus(file, argp);1795 case SNDRV_TIMER_IOCTL_SELECT:1796 return snd_timer_user_tselect(file, argp);1797 case SNDRV_TIMER_IOCTL_INFO:1798 return snd_timer_user_info(file, argp);1799 case SNDRV_TIMER_IOCTL_PARAMS:1800 return snd_timer_user_params(file, argp);1801 case SNDRV_TIMER_IOCTL_STATUS:1802 return snd_timer_user_status(file, argp);1803 case SNDRV_TIMER_IOCTL_START:1804 case SNDRV_TIMER_IOCTL_START_OLD:1805 return snd_timer_user_start(file);1806 case SNDRV_TIMER_IOCTL_STOP:1807 case SNDRV_TIMER_IOCTL_STOP_OLD:1808 return snd_timer_user_stop(file);1809 case SNDRV_TIMER_IOCTL_CONTINUE:1810 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:1811 return snd_timer_user_continue(file);1812 case SNDRV_TIMER_IOCTL_PAUSE:1813 case SNDRV_TIMER_IOCTL_PAUSE_OLD:1814 return snd_timer_user_pause(file);1815 }1816 return -ENOTTY;1817}18181819static int snd_timer_user_fasync(int fd, struct file * file, int on)1820{1821 struct snd_timer_user *tu;1822 int err;18231824 tu = file->private_data;1825 err = fasync_helper(fd, file, on, &tu->fasync);1826 if (err < 0)1827 return err;1828 return 0;1829}18301831static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,1832 size_t count, loff_t *offset)1833{1834 struct snd_timer_user *tu;1835 long result = 0, unit;1836 int err = 0;18371838 tu = file->private_data;1839 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);1840 spin_lock_irq(&tu->qlock);1841 while ((long)count - result >= unit) {1842 while (!tu->qused) {1843 wait_queue_t wait;18441845 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {1846 err = -EAGAIN;1847 break;1848 }18491850 set_current_state(TASK_INTERRUPTIBLE);1851 init_waitqueue_entry(&wait, current);1852 add_wait_queue(&tu->qchange_sleep, &wait);18531854 spin_unlock_irq(&tu->qlock);1855 schedule();1856 spin_lock_irq(&tu->qlock);18571858 remove_wait_queue(&tu->qchange_sleep, &wait);18591860 if (signal_pending(current)) {1861 err = -ERESTARTSYS;1862 break;1863 }1864 }18651866 spin_unlock_irq(&tu->qlock);1867 if (err < 0)1868 goto _error;18691870 if (tu->tread) {1871 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],1872 sizeof(struct snd_timer_tread))) {1873 err = -EFAULT;1874 goto _error;1875 }1876 } else {1877 if (copy_to_user(buffer, &tu->queue[tu->qhead++],1878 sizeof(struct snd_timer_read))) {1879 err = -EFAULT;1880 goto _error;1881 }1882 }18831884 tu->qhead %= tu->queue_size;18851886 result += unit;1887 buffer += unit;18881889 spin_lock_irq(&tu->qlock);1890 tu->qused--;1891 }1892 spin_unlock_irq(&tu->qlock);1893 _error:1894 return result > 0 ? result : err;1895}18961897static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)1898{1899 unsigned int mask;1900 struct snd_timer_user *tu;19011902 tu = file->private_data;19031904 poll_wait(file, &tu->qchange_sleep, wait);19051906 mask = 0;1907 if (tu->qused)1908 mask |= POLLIN | POLLRDNORM;19091910 return mask;1911}19121913#ifdef CONFIG_COMPAT1914#include "timer_compat.c"1915#else1916#define snd_timer_user_ioctl_compat NULL1917#endif19181919static const struct file_operations snd_timer_f_ops =1920{1921 .owner = THIS_MODULE,1922 .read = snd_timer_user_read,1923 .open = snd_timer_user_open,1924 .release = snd_timer_user_release,1925 .poll = snd_timer_user_poll,1926 .unlocked_ioctl = snd_timer_user_ioctl,1927 .compat_ioctl = snd_timer_user_ioctl_compat,1928 .fasync = snd_timer_user_fasync,1929};19301931/*1932 * ENTRY functions1933 */19341935static int __init alsa_timer_init(void)1936{1937 int err;19381939#ifdef SNDRV_OSS_INFO_DEV_TIMERS1940 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,1941 "system timer");1942#endif19431944 if ((err = snd_timer_register_system()) < 0)1945 snd_printk(KERN_ERR "unable to register system timer (%i)\n",1946 err);1947 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,1948 &snd_timer_f_ops, NULL, "timer")) < 0)1949 snd_printk(KERN_ERR "unable to register timer device (%i)\n",1950 err);1951 snd_timer_proc_init();1952 return 0;1953}19541955static void __exit alsa_timer_exit(void)1956{1957 struct list_head *p, *n;19581959 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);1960 /* unregister the system timer */1961 list_for_each_safe(p, n, &snd_timer_list) {1962 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);1963 snd_timer_free(timer);1964 }1965 snd_timer_proc_done();1966#ifdef SNDRV_OSS_INFO_DEV_TIMERS1967 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);1968#endif1969}19701971module_init(alsa_timer_init)1972module_exit(alsa_timer_exit)19731974EXPORT_SYMBOL(snd_timer_open);1975EXPORT_SYMBOL(snd_timer_close);1976EXPORT_SYMBOL(snd_timer_resolution);1977EXPORT_SYMBOL(snd_timer_start);1978EXPORT_SYMBOL(snd_timer_stop);1979EXPORT_SYMBOL(snd_timer_continue);1980EXPORT_SYMBOL(snd_timer_pause);1981EXPORT_SYMBOL(snd_timer_new);1982EXPORT_SYMBOL(snd_timer_notify);1983EXPORT_SYMBOL(snd_timer_global_new);1984EXPORT_SYMBOL(snd_timer_global_free);1985EXPORT_SYMBOL(snd_timer_global_register);1986EXPORT_SYMBOL(snd_timer_interrupt);