| /* |
| * Timers abstract layer |
| * Copyright (c) by Jaroslav Kysela <perex@suse.cz> |
| * |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <sound/driver.h> |
| #include <linux/delay.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/time.h> |
| #include <sound/core.h> |
| #include <sound/timer.h> |
| #include <sound/control.h> |
| #include <sound/info.h> |
| #include <sound/minors.h> |
| #include <sound/initval.h> |
| #include <linux/kmod.h> |
| #ifdef CONFIG_KERNELD |
| #include <linux/kerneld.h> |
| #endif |
| |
| #if !defined(CONFIG_SND_RTCTIMER) && !defined(CONFIG_SND_RTCTIMER_MODULE) |
| #define DEFAULT_TIMER_LIMIT 1 |
| #else |
| #define DEFAULT_TIMER_LIMIT 2 |
| #endif |
| |
| int timer_limit = DEFAULT_TIMER_LIMIT; |
| MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>"); |
| MODULE_DESCRIPTION("ALSA timer interface"); |
| MODULE_LICENSE("GPL"); |
| MODULE_CLASSES("{sound}"); |
| MODULE_PARM(timer_limit, "i"); |
| MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); |
| |
| typedef struct { |
| snd_timer_instance_t *timeri; |
| unsigned long ticks; |
| unsigned long overrun; |
| int qhead; |
| int qtail; |
| int qused; |
| int queue_size; |
| snd_timer_read_t *queue; |
| spinlock_t qlock; |
| wait_queue_head_t qchange_sleep; |
| } snd_timer_user_t; |
| |
| /* list of timers */ |
| static LIST_HEAD(snd_timer_list); |
| |
| /* list of slave instances */ |
| static LIST_HEAD(snd_timer_slave_list); |
| |
| /* lock for slave active lists */ |
| static spinlock_t slave_active_lock = SPIN_LOCK_UNLOCKED; |
| |
| static DECLARE_MUTEX(register_mutex); |
| |
| static int snd_timer_free(snd_timer_t *timer); |
| static int snd_timer_dev_free(snd_device_t *device); |
| static int snd_timer_dev_register(snd_device_t *device); |
| static int snd_timer_dev_unregister(snd_device_t *device); |
| |
| static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left); |
| |
| /* |
| * create a timer instance with the given owner string. |
| * when timer is not NULL, increments the module counter |
| */ |
| static snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *timer) |
| { |
| snd_timer_instance_t *timeri; |
| timeri = snd_kcalloc(sizeof(snd_timer_instance_t), GFP_KERNEL); |
| if (timeri == NULL) |
| return NULL; |
| timeri->owner = snd_kmalloc_strdup(owner, GFP_KERNEL); |
| if (! timeri->owner) { |
| kfree(timeri); |
| return NULL; |
| } |
| INIT_LIST_HEAD(&timeri->open_list); |
| INIT_LIST_HEAD(&timeri->active_list); |
| INIT_LIST_HEAD(&timeri->slave_list_head); |
| INIT_LIST_HEAD(&timeri->slave_active_head); |
| timeri->in_use = (atomic_t)ATOMIC_INIT(0); |
| |
| timeri->timer = timer; |
| if (timer && timer->card && !try_module_get(timer->card->module)) { |
| kfree(timeri->owner); |
| kfree(timeri); |
| return NULL; |
| } |
| |
| return timeri; |
| } |
| |
| /* |
| * find a timer instance from the given timer id |
| */ |
| static snd_timer_t *snd_timer_find(snd_timer_id_t *tid) |
| { |
| snd_timer_t *timer = NULL; |
| struct list_head *p; |
| |
| list_for_each(p, &snd_timer_list) { |
| timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); |
| |
| if (timer->tmr_class != tid->dev_class) |
| continue; |
| if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || |
| timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && |
| (timer->card == NULL || |
| timer->card->number != tid->card)) |
| continue; |
| if (timer->tmr_device != tid->device) |
| continue; |
| if (timer->tmr_subdevice != tid->subdevice) |
| continue; |
| return timer; |
| } |
| return NULL; |
| } |
| |
| #ifdef CONFIG_KMOD |
| |
| static void snd_timer_request(snd_timer_id_t *tid) |
| { |
| char str[32]; |
| |
| switch (tid->dev_class) { |
| case SNDRV_TIMER_CLASS_GLOBAL: |
| if (tid->device >= timer_limit) |
| return; |
| sprintf(str, "snd-timer-%i", tid->device); |
| break; |
| case SNDRV_TIMER_CLASS_CARD: |
| case SNDRV_TIMER_CLASS_PCM: |
| if (tid->card >= snd_ecards_limit) |
| return; |
| sprintf(str, "snd-card-%i", tid->card); |
| break; |
| default: |
| return; |
| } |
| request_module(str); |
| } |
| |
| #endif |
| |
| /* |
| * look for a master instance matching with the slave id of the given slave. |
| * when found, relink the open_link of the slave. |
| * |
| * call this with register_mutex down. |
| */ |
| static void snd_timer_check_slave(snd_timer_instance_t *slave) |
| { |
| snd_timer_t *timer; |
| snd_timer_instance_t *master; |
| struct list_head *p, *q; |
| |
| /* FIXME: it's really dumb to look up all entries.. */ |
| list_for_each(p, &snd_timer_list) { |
| timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); |
| list_for_each(q, &timer->open_list_head) { |
| master = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list); |
| if (slave->slave_class == master->slave_class && |
| slave->slave_id == master->slave_id) { |
| list_del(&slave->open_list); |
| list_add_tail(&slave->open_list, &master->slave_list_head); |
| slave->master = master; |
| return; |
| } |
| } |
| } |
| } |
| |
| /* |
| * look for slave instances matching with the slave id of the given master. |
| * when found, relink the open_link of slaves. |
| * |
| * call this with register_mutex down. |
| */ |
| static void snd_timer_check_master(snd_timer_instance_t *master) |
| { |
| snd_timer_instance_t *slave; |
| struct list_head *p, *n; |
| unsigned long flags; |
| |
| /* check all pending slaves */ |
| list_for_each_safe(p, n, &snd_timer_slave_list) { |
| slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); |
| if (slave->slave_class == master->slave_class && |
| slave->slave_id == master->slave_id) { |
| list_del(p); |
| list_add_tail(p, &master->slave_list_head); |
| spin_lock_irqsave(&slave_active_lock, flags); |
| /* protected here so that timer_start() doesn't start |
| * this slave yet. |
| */ |
| slave->master = master; |
| spin_unlock_irqrestore(&slave_active_lock, flags); |
| } |
| } |
| } |
| |
| /* |
| * open a timer instance |
| * when opening a master, the slave id must be here given. |
| */ |
| snd_timer_instance_t *snd_timer_open(char *owner, snd_timer_id_t *tid, |
| unsigned int slave_id) |
| { |
| snd_timer_t *timer; |
| snd_timer_instance_t *timeri = NULL; |
| |
| if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { |
| /* open a slave instance */ |
| if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || |
| tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { |
| snd_printd("invalid slave class %i\n", tid->dev_sclass); |
| return NULL; |
| } |
| down(®ister_mutex); |
| timeri = snd_timer_instance_new(owner, NULL); |
| timeri->slave_class = tid->dev_sclass; |
| timeri->slave_id = tid->device; |
| timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; |
| list_add_tail(&timeri->open_list, &snd_timer_slave_list); |
| snd_timer_check_slave(timeri); |
| up(®ister_mutex); |
| return timeri; |
| } |
| |
| /* open a master instance */ |
| down(®ister_mutex); |
| timer = snd_timer_find(tid); |
| #ifdef CONFIG_KMOD |
| if (timer == NULL) { |
| up(®ister_mutex); |
| snd_timer_request(tid); |
| down(®ister_mutex); |
| timer = snd_timer_find(tid); |
| } |
| #endif |
| if (timer) { |
| timeri = snd_timer_instance_new(owner, timer); |
| if (timeri) { |
| timeri->slave_class = tid->dev_sclass; |
| timeri->slave_id = slave_id; |
| if (list_empty(&timer->open_list_head) && timer->hw.open) |
| timer->hw.open(timer); |
| list_add_tail(&timeri->open_list, &timer->open_list_head); |
| snd_timer_check_master(timeri); |
| } |
| } |
| up(®ister_mutex); |
| return timeri; |
| } |
| |
| |
| /* |
| * close a timer instance |
| */ |
| int snd_timer_close(snd_timer_instance_t * timeri) |
| { |
| snd_timer_t *timer = NULL; |
| unsigned long flags; |
| struct list_head *p, *n; |
| snd_timer_instance_t *slave; |
| |
| snd_assert(timeri != NULL, return -ENXIO); |
| |
| snd_timer_stop(timeri); /* force to stop the timer */ |
| |
| if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { |
| down(®ister_mutex); |
| list_del(&timeri->open_list); |
| up(®ister_mutex); |
| } else { |
| timer = timeri->timer; |
| down(®ister_mutex); |
| list_del(&timeri->open_list); |
| if (timer && list_empty(&timer->open_list_head) && timer->hw.close) |
| timer->hw.close(timer); |
| /* remove slave links */ |
| list_for_each_safe(p, n, &timeri->slave_list_head) { |
| slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); |
| list_del(p); |
| list_add_tail(p, &snd_timer_slave_list); |
| spin_lock_irqsave(&slave_active_lock, flags); |
| slave->flags &= ~SNDRV_TIMER_IFLG_RUNNING; |
| list_del_init(&slave->active_list); |
| slave->master = NULL; |
| spin_unlock_irqrestore(&slave_active_lock, flags); |
| } |
| up(®ister_mutex); |
| } |
| if (timeri->private_free) |
| timeri->private_free(timeri); |
| if (timeri->owner) |
| kfree(timeri->owner); |
| kfree(timeri); |
| if (timer && timer->card) |
| module_put(timer->card->module); |
| return 0; |
| } |
| |
| unsigned long snd_timer_resolution(snd_timer_instance_t * timeri) |
| { |
| snd_timer_t * timer; |
| |
| if (timeri == NULL) |
| return 0; |
| if ((timer = timeri->timer) != NULL) { |
| if (timer->hw.c_resolution) |
| return timer->hw.c_resolution(timer); |
| return timer->hw.resolution; |
| } |
| return 0; |
| } |
| |
| static int snd_timer_start1(snd_timer_t *timer, snd_timer_instance_t *timeri, unsigned long sticks) |
| { |
| list_del(&timeri->active_list); |
| list_add_tail(&timeri->active_list, &timer->active_list_head); |
| if (timer->running) { |
| timer->flags |= SNDRV_TIMER_FLG_RESCHED; |
| timeri->flags |= SNDRV_TIMER_IFLG_START; |
| return 1; /* delayed start */ |
| } else { |
| timer->sticks = sticks; |
| timer->hw.start(timer); |
| timer->running++; |
| timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; |
| return 0; |
| } |
| } |
| |
| static int snd_timer_start_slave(snd_timer_instance_t *timeri) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&slave_active_lock, flags); |
| timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; |
| if (timeri->master) |
| list_add_tail(&timeri->active_list, &timeri->master->slave_active_head); |
| spin_unlock_irqrestore(&slave_active_lock, flags); |
| return 1; /* delayed start */ |
| } |
| |
| int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks) |
| { |
| snd_timer_t *timer; |
| int result = -EINVAL; |
| unsigned long flags; |
| |
| if (timeri == NULL || ticks < 1) |
| return -EINVAL; |
| if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) |
| return snd_timer_start_slave(timeri); |
| timer = timeri->timer; |
| if (timer == NULL) |
| return -EINVAL; |
| spin_lock_irqsave(&timer->lock, flags); |
| timeri->ticks = timeri->cticks = ticks; |
| result = snd_timer_start1(timer, timeri, ticks); |
| spin_unlock_irqrestore(&timer->lock, flags); |
| return result; |
| } |
| |
| /* |
| * stop the timer instance. |
| * |
| * do not call this from the timer callback! |
| */ |
| int snd_timer_stop(snd_timer_instance_t * timeri) |
| { |
| snd_timer_t *timer; |
| unsigned long flags; |
| |
| snd_assert(timeri != NULL, return -ENXIO); |
| |
| if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { |
| spin_lock_irqsave(&slave_active_lock, flags); |
| if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) { |
| timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; |
| list_del_init(&timeri->active_list); |
| } |
| spin_unlock_irqrestore(&slave_active_lock, flags); |
| return 0; |
| } |
| |
| timer = timeri->timer; |
| if (! timer) |
| return -EINVAL; |
| spin_lock_irqsave(&timer->lock, flags); |
| while (atomic_read(&timeri->in_use)) { |
| spin_unlock_irqrestore(&timer->lock, flags); |
| udelay(10); |
| spin_lock_irqsave(&timer->lock, flags); |
| } |
| if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) { |
| timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; |
| list_del_init(&timeri->active_list); |
| if (!(--timer->running)) { |
| timer->hw.stop(timer); |
| if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { |
| timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; |
| snd_timer_reschedule(timer, 0); |
| if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { |
| timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; |
| timer->hw.start(timer); |
| } |
| } |
| } |
| } else if (timeri->flags & SNDRV_TIMER_IFLG_START) { |
| timeri->flags &= ~SNDRV_TIMER_IFLG_START; |
| list_del_init(&timeri->active_list); |
| } |
| spin_unlock_irqrestore(&timer->lock, flags); |
| return 0; |
| } |
| |
| /* |
| * delete the timer instance from active list. |
| * |
| * call this from the timer callback only! |
| */ |
| int snd_timer_del(snd_timer_instance_t * timeri) |
| { |
| snd_timer_t *timer; |
| |
| snd_assert(timeri != NULL, return -ENXIO); |
| |
| if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { |
| timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; |
| list_del_init(&timeri->active_list); |
| return 0; |
| } |
| |
| timer = timeri->timer; |
| if (! timer) |
| return -EINVAL; |
| spin_lock(&timer->lock); |
| if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) { |
| timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; |
| list_del_init(&timeri->active_list); |
| if (!(--timer->running)) |
| timer->hw.stop(timer); |
| } else if (timeri->flags & SNDRV_TIMER_IFLG_START) { |
| timeri->flags &= ~SNDRV_TIMER_IFLG_START; |
| list_del_init(&timeri->active_list); |
| } |
| spin_unlock(&timer->lock); |
| return 0; |
| } |
| |
| /* |
| * start again.. the tick is kept. |
| */ |
| int snd_timer_continue(snd_timer_instance_t * timeri) |
| { |
| snd_timer_t *timer; |
| int result = -EINVAL; |
| unsigned long flags; |
| |
| if (timeri == NULL) |
| return result; |
| if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) |
| return snd_timer_start_slave(timeri); |
| timer = timeri->timer; |
| if (! timer) |
| return -EINVAL; |
| spin_lock_irqsave(&timer->lock, flags); |
| if (!timeri->cticks) |
| timeri->cticks = 1; |
| result = snd_timer_start1(timer, timeri, timer->sticks); |
| spin_unlock_irqrestore(&timer->lock, flags); |
| return result; |
| } |
| |
| /* |
| * reschedule the timer |
| * |
| * start pending instances and check the scheduling ticks. |
| * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. |
| */ |
| static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left) |
| { |
| snd_timer_instance_t *ti; |
| unsigned long ticks = ~0UL; |
| struct list_head *p; |
| |
| list_for_each(p, &timer->active_list_head) { |
| ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); |
| if (ti->flags & SNDRV_TIMER_IFLG_START) { |
| ti->flags &= ~SNDRV_TIMER_IFLG_START; |
| ti->flags |= SNDRV_TIMER_IFLG_RUNNING; |
| timer->running++; |
| } |
| if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { |
| if (ticks > ti->cticks) |
| ticks = ti->cticks; |
| } |
| } |
| if (ticks == ~0UL) { |
| timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; |
| return; |
| } |
| if (ticks > timer->hw.ticks) |
| ticks = timer->hw.ticks; |
| if (ticks_left != ticks) |
| timer->flags |= SNDRV_TIMER_FLG_CHANGE; |
| timer->sticks = ticks; |
| } |
| |
| |
| /* |
| * timer interrupt |
| * |
| * ticks_left is usually equal to timer->sticks. |
| * |
| */ |
| void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left) |
| { |
| snd_timer_instance_t *ti, *ts; |
| unsigned long resolution; |
| LIST_HEAD(done_list_head); |
| struct list_head *p, *q, *n; |
| |
| if (timer == NULL) |
| return; |
| spin_lock(&timer->lock); |
| /* loop for all active instances |
| * here we cannot use list_for_each because the active_list of a processed |
| * instance is relinked to done_list_head before callback is called. |
| */ |
| list_for_each_safe(p, n, &timer->active_list_head) { |
| ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); |
| if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { |
| if (ti->cticks < ticks_left) |
| ti->cticks = 0; |
| else |
| ti->cticks -= ticks_left; |
| if (!ti->cticks) { /* expired */ |
| if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { |
| ti->cticks = ti->ticks; |
| } else { |
| ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; |
| timer->running--; |
| } |
| /* relink to done_list */ |
| list_del(p); |
| list_add_tail(p, &done_list_head); |
| atomic_inc(&ti->in_use); |
| } |
| } |
| } |
| if (timer->flags & SNDRV_TIMER_FLG_RESCHED) |
| snd_timer_reschedule(timer, ticks_left); |
| if (timer->running) { |
| if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { |
| timer->hw.stop(timer); |
| timer->flags |= SNDRV_TIMER_FLG_CHANGE; |
| } |
| if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || |
| (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { |
| /* restart timer */ |
| timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; |
| timer->hw.start(timer); |
| } |
| } else { |
| timer->hw.stop(timer); |
| } |
| |
| /* remember the current resolution */ |
| if (timer->hw.c_resolution) |
| resolution = timer->hw.c_resolution(timer); |
| else |
| resolution = timer->hw.resolution; |
| |
| /* now process all callbacks */ |
| list_for_each_safe(p, n, &done_list_head) { |
| ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); |
| /* append to active_list */ |
| list_del(p); |
| if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) |
| list_add_tail(p, &timer->active_list_head); |
| spin_unlock(&timer->lock); |
| if (ti->callback) |
| ti->callback(ti, resolution, ti->ticks, ti->callback_data); |
| spin_lock(&slave_active_lock); |
| /* call callbacks of slaves */ |
| list_for_each(q, &ti->slave_active_head) { |
| ts = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, active_list); |
| if (ts->callback) |
| ts->callback(ts, resolution, ti->ticks, ts->callback_data); |
| } |
| spin_unlock(&slave_active_lock); |
| spin_lock(&timer->lock); |
| atomic_dec(&ti->in_use); |
| } |
| spin_unlock(&timer->lock); |
| } |
| |
| |
| /* |
| |
| */ |
| |
| int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer) |
| { |
| snd_timer_t *timer; |
| int err; |
| static snd_device_ops_t ops = { |
| .dev_free = snd_timer_dev_free, |
| .dev_register = snd_timer_dev_register, |
| .dev_unregister = snd_timer_dev_unregister |
| }; |
| |
| snd_assert(tid != NULL, return -EINVAL); |
| snd_assert(rtimer != NULL, return -EINVAL); |
| *rtimer = NULL; |
| timer = snd_magic_kcalloc(snd_timer_t, 0, GFP_KERNEL); |
| if (timer == NULL) |
| return -ENOMEM; |
| timer->tmr_class = tid->dev_class; |
| timer->card = card; |
| timer->tmr_device = tid->device; |
| timer->tmr_subdevice = tid->subdevice; |
| if (id) |
| strncpy(timer->id, id, sizeof(timer->id) - 1); |
| INIT_LIST_HEAD(&timer->device_list); |
| INIT_LIST_HEAD(&timer->open_list_head); |
| INIT_LIST_HEAD(&timer->active_list_head); |
| spin_lock_init(&timer->lock); |
| if (card != NULL) { |
| if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) { |
| snd_timer_free(timer); |
| return err; |
| } |
| } |
| *rtimer = timer; |
| return 0; |
| } |
| |
| static int snd_timer_free(snd_timer_t *timer) |
| { |
| snd_assert(timer != NULL, return -ENXIO); |
| if (timer->private_free) |
| timer->private_free(timer); |
| snd_magic_kfree(timer); |
| return 0; |
| } |
| |
| int snd_timer_dev_free(snd_device_t *device) |
| { |
| snd_timer_t *timer = snd_magic_cast(snd_timer_t, device->device_data, return -ENXIO); |
| return snd_timer_free(timer); |
| } |
| |
| int snd_timer_dev_register(snd_device_t *dev) |
| { |
| snd_timer_t *timer = snd_magic_cast(snd_timer_t, dev->device_data, return -ENXIO); |
| snd_timer_t *timer1; |
| struct list_head *p; |
| |
| snd_assert(timer != NULL && timer->hw.start != NULL && timer->hw.stop != NULL, return -ENXIO); |
| if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && |
| !timer->hw.resolution && timer->hw.c_resolution == NULL) |
| return -EINVAL; |
| |
| down(®ister_mutex); |
| list_for_each(p, &snd_timer_list) { |
| timer1 = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); |
| if (timer1->tmr_class > timer->tmr_class) |
| break; |
| if (timer1->tmr_class < timer->tmr_class) |
| continue; |
| if (timer1->card && timer->card) { |
| if (timer1->card->number > timer->card->number) |
| break; |
| if (timer1->card->number < timer->card->number) |
| continue; |
| } |
| if (timer1->tmr_device > timer->tmr_device) |
| break; |
| if (timer1->tmr_device < timer->tmr_device) |
| continue; |
| if (timer1->tmr_subdevice > timer->tmr_subdevice) |
| break; |
| if (timer1->tmr_subdevice < timer->tmr_subdevice) |
| continue; |
| /* conflicts.. */ |
| up(®ister_mutex); |
| return -EBUSY; |
| } |
| list_add_tail(&timer->device_list, p); |
| up(®ister_mutex); |
| return 0; |
| } |
| |
| int snd_timer_unregister(snd_timer_t *timer) |
| { |
| struct list_head *p, *n; |
| snd_timer_instance_t *ti; |
| |
| snd_assert(timer != NULL, return -ENXIO); |
| down(®ister_mutex); |
| if (! list_empty(&timer->open_list_head)) { |
| snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer); |
| list_for_each_safe(p, n, &timer->open_list_head) { |
| list_del_init(p); |
| ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); |
| ti->timer = NULL; |
| } |
| } |
| list_del(&timer->device_list); |
| up(®ister_mutex); |
| return snd_timer_free(timer); |
| } |
| |
| static int snd_timer_dev_unregister(snd_device_t *device) |
| { |
| snd_timer_t *timer = snd_magic_cast(snd_timer_t, device->device_data, return -ENXIO); |
| return snd_timer_unregister(timer); |
| } |
| |
| /* |
| * exported functions for global timers |
| */ |
| int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer) |
| { |
| snd_timer_id_t tid; |
| |
| tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; |
| tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; |
| tid.card = -1; |
| tid.device = device; |
| tid.subdevice = 0; |
| return snd_timer_new(NULL, id, &tid, rtimer); |
| } |
| |
| int snd_timer_global_free(snd_timer_t *timer) |
| { |
| return snd_timer_free(timer); |
| } |
| |
| int snd_timer_global_register(snd_timer_t *timer) |
| { |
| snd_device_t dev; |
| |
| memset(&dev, 0, sizeof(dev)); |
| dev.device_data = timer; |
| return snd_timer_dev_register(&dev); |
| } |
| |
| int snd_timer_global_unregister(snd_timer_t *timer) |
| { |
| return snd_timer_unregister(timer); |
| } |
| |
| /* |
| * System timer |
| */ |
| |
| unsigned int snd_timer_system_resolution(void) |
| { |
| return 1000000000L / HZ; |
| } |
| |
| static void snd_timer_s_function(unsigned long data) |
| { |
| snd_timer_t *timer = (snd_timer_t *)data; |
| snd_timer_interrupt(timer, timer->sticks); |
| } |
| |
| static int snd_timer_s_start(snd_timer_t * timer) |
| { |
| struct timer_list *tlist; |
| |
| tlist = (struct timer_list *) timer->private_data; |
| tlist->expires = jiffies + timer->sticks; |
| add_timer(tlist); |
| return 0; |
| } |
| |
| static int snd_timer_s_stop(snd_timer_t * timer) |
| { |
| struct timer_list *tlist; |
| |
| tlist = (struct timer_list *) timer->private_data; |
| del_timer(tlist); |
| timer->sticks = tlist->expires - jiffies; |
| return 0; |
| } |
| |
| static struct _snd_timer_hardware snd_timer_system = |
| { |
| .flags = SNDRV_TIMER_HW_FIRST, |
| .resolution = 1000000000L / HZ, |
| .ticks = 10000000L, |
| .start = snd_timer_s_start, |
| .stop = snd_timer_s_stop |
| }; |
| |
| static void snd_timer_free_system(snd_timer_t *timer) |
| { |
| if (timer->private_data) |
| kfree(timer->private_data); |
| } |
| |
| static int snd_timer_register_system(void) |
| { |
| snd_timer_t *timer; |
| struct timer_list *tlist; |
| int err; |
| |
| if ((err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer)) < 0) |
| return err; |
| strcpy(timer->name, "system timer"); |
| timer->hw = snd_timer_system; |
| tlist = (struct timer_list *) snd_kcalloc(sizeof(struct timer_list), GFP_KERNEL); |
| if (tlist == NULL) { |
| snd_timer_free(timer); |
| return -ENOMEM; |
| } |
| init_timer(tlist); |
| tlist->function = snd_timer_s_function; |
| tlist->data = (unsigned long) timer; |
| timer->private_data = tlist; |
| timer->private_free = snd_timer_free_system; |
| return snd_timer_global_register(timer); |
| } |
| |
| /* |
| * Info interface |
| */ |
| |
| static void snd_timer_proc_read(snd_info_entry_t *entry, |
| snd_info_buffer_t * buffer) |
| { |
| unsigned long flags; |
| snd_timer_t *timer; |
| snd_timer_instance_t *ti; |
| struct list_head *p, *q; |
| |
| down(®ister_mutex); |
| list_for_each(p, &snd_timer_list) { |
| timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); |
| switch (timer->tmr_class) { |
| case SNDRV_TIMER_CLASS_GLOBAL: |
| snd_iprintf(buffer, "G%i: ", timer->tmr_device); |
| break; |
| case SNDRV_TIMER_CLASS_CARD: |
| snd_iprintf(buffer, "C%i-%i: ", timer->card->number, timer->tmr_device); |
| break; |
| case SNDRV_TIMER_CLASS_PCM: |
| snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, timer->tmr_device, timer->tmr_subdevice); |
| break; |
| default: |
| snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, timer->card ? timer->card->number : -1, timer->tmr_device, timer->tmr_subdevice); |
| } |
| snd_iprintf(buffer, "%s :", timer->name); |
| if (timer->hw.resolution) |
| snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", timer->hw.resolution / 1000, timer->hw.resolution % 1000, timer->hw.ticks); |
| if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) |
| snd_iprintf(buffer, " SLAVE"); |
| snd_iprintf(buffer, "\n"); |
| spin_lock_irqsave(&timer->lock, flags); |
| list_for_each(q, &timer->open_list_head) { |
| ti = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list); |
| snd_iprintf(buffer, " Client %s : %s : lost interrupts %li\n", |
| ti->owner ? ti->owner : "unknown", |
| ti->flags & (SNDRV_TIMER_IFLG_START|SNDRV_TIMER_IFLG_RUNNING) ? "running" : "stopped", |
| ti->lost); |
| } |
| spin_unlock_irqrestore(&timer->lock, flags); |
| } |
| up(®ister_mutex); |
| } |
| |
| /* |
| * USER SPACE interface |
| */ |
| |
| static void snd_timer_user_interrupt(snd_timer_instance_t *timeri, |
| unsigned long resolution, |
| unsigned long ticks, |
| void *data) |
| { |
| unsigned long flags; |
| snd_timer_user_t *tu = snd_magic_cast(snd_timer_user_t, data, return); |
| snd_timer_read_t *r; |
| |
| if (tu->qused >= tu->queue_size) { |
| tu->overrun++; |
| } else { |
| spin_lock_irqsave(&tu->qlock, flags); |
| r = &tu->queue[tu->qtail++]; |
| tu->qtail %= tu->queue_size; |
| r->resolution = resolution; |
| r->ticks = ticks; |
| tu->qused++; |
| spin_unlock_irqrestore(&tu->qlock, flags); |
| wake_up(&tu->qchange_sleep); |
| } |
| } |
| |
| static int snd_timer_user_open(struct inode *inode, struct file *file) |
| { |
| snd_timer_user_t *tu; |
| |
| tu = snd_magic_kcalloc(snd_timer_user_t, 0, GFP_KERNEL); |
| if (tu == NULL) |
| return -ENOMEM; |
| spin_lock_init(&tu->qlock); |
| init_waitqueue_head(&tu->qchange_sleep); |
| tu->ticks = 1; |
| tu->queue_size = 128; |
| tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); |
| if (tu->queue == NULL) { |
| snd_magic_kfree(tu); |
| return -ENOMEM; |
| } |
| file->private_data = tu; |
| #ifdef LINUX_2_2 |
| MOD_INC_USE_COUNT; |
| #endif |
| return 0; |
| } |
| |
| static int snd_timer_user_release(struct inode *inode, struct file *file) |
| { |
| snd_timer_user_t *tu; |
| |
| if (file->private_data) { |
| tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO); |
| file->private_data = NULL; |
| if (tu->timeri) |
| snd_timer_close(tu->timeri); |
| if (tu->queue) |
| kfree(tu->queue); |
| snd_magic_kfree(tu); |
| } |
| #ifdef LINUX_2_2 |
| MOD_DEC_USE_COUNT; |
| #endif |
| return 0; |
| } |
| |
| static void snd_timer_user_zero_id(snd_timer_id_t *id) |
| { |
| id->dev_class = SNDRV_TIMER_CLASS_NONE; |
| id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; |
| id->card = -1; |
| id->device = -1; |
| id->subdevice = -1; |
| } |
| |
| static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer) |
| { |
| id->dev_class = timer->tmr_class; |
| id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; |
| id->card = timer->card ? timer->card->number : -1; |
| id->device = timer->tmr_device; |
| id->subdevice = timer->tmr_subdevice; |
| } |
| |
| static int snd_timer_user_next_device(snd_timer_id_t *_tid) |
| { |
| snd_timer_id_t id; |
| snd_timer_t *timer; |
| struct list_head *p; |
| |
| if (copy_from_user(&id, _tid, sizeof(id))) |
| return -EFAULT; |
| down(®ister_mutex); |
| if (id.dev_class < 0) { /* first item */ |
| if (list_empty(&snd_timer_list)) |
| snd_timer_user_zero_id(&id); |
| else { |
| timer = (snd_timer_t *)list_entry(snd_timer_list.next, snd_timer_t, device_list); |
| snd_timer_user_copy_id(&id, timer); |
| } |
| } else { |
| switch (id.dev_class) { |
| case SNDRV_TIMER_CLASS_GLOBAL: |
| id.device = id.device < 0 ? 0 : id.device + 1; |
| list_for_each(p, &snd_timer_list) { |
| timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); |
| if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { |
| snd_timer_user_copy_id(&id, timer); |
| break; |
| } |
| if (timer->tmr_device >= id.device) { |
| snd_timer_user_copy_id(&id, timer); |
| break; |
| } |
| } |
| if (p == &snd_timer_list) |
| snd_timer_user_zero_id(&id); |
| break; |
| case SNDRV_TIMER_CLASS_CARD: |
| case SNDRV_TIMER_CLASS_PCM: |
| if (id.card < 0) { |
| id.card = 0; |
| } else { |
| if (id.card < 0) { |
| id.card = 0; |
| } else { |
| if (id.device < 0) { |
| id.device = 0; |
| } else { |
| id.subdevice = id.subdevice < 0 ? 0 : id.subdevice + 1; |
| } |
| } |
| } |
| list_for_each(p, &snd_timer_list) { |
| timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); |
| if (timer->tmr_class > id.dev_class) { |
| snd_timer_user_copy_id(&id, timer); |
| break; |
| } |
| if (timer->tmr_class < id.dev_class) |
| continue; |
| if (timer->card->number > id.card) { |
| snd_timer_user_copy_id(&id, timer); |
| break; |
| } |
| if (timer->card->number < id.card) |
| continue; |
| if (timer->tmr_device > id.device) { |
| snd_timer_user_copy_id(&id, timer); |
| break; |
| } |
| if (timer->tmr_device < id.device) |
| continue; |
| if (timer->tmr_subdevice > id.subdevice) { |
| snd_timer_user_copy_id(&id, timer); |
| break; |
| } |
| if (timer->tmr_subdevice < id.subdevice) |
| continue; |
| snd_timer_user_copy_id(&id, timer); |
| break; |
| } |
| if (p == &snd_timer_list) |
| snd_timer_user_zero_id(&id); |
| break; |
| default: |
| snd_timer_user_zero_id(&id); |
| } |
| } |
| up(®ister_mutex); |
| if (copy_to_user(_tid, &id, sizeof(*_tid))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int snd_timer_user_tselect(struct file *file, snd_timer_select_t *_tselect) |
| { |
| snd_timer_user_t *tu; |
| snd_timer_select_t tselect; |
| char str[32]; |
| |
| tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO); |
| if (tu->timeri) |
| snd_timer_close(tu->timeri); |
| if (copy_from_user(&tselect, _tselect, sizeof(tselect))) |
| return -EFAULT; |
| sprintf(str, "application %i", current->pid); |
| if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) |
| tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; |
| if ((tu->timeri = snd_timer_open(str, &tselect.id, current->pid)) == NULL) |
| return -ENODEV; |
| tu->timeri->callback = snd_timer_user_interrupt; |
| tu->timeri->callback_data = (void *)tu; |
| return 0; |
| } |
| |
| static int snd_timer_user_info(struct file *file, snd_timer_info_t *_info) |
| { |
| snd_timer_user_t *tu; |
| snd_timer_info_t info; |
| snd_timer_t *t; |
| |
| tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO); |
| snd_assert(tu->timeri != NULL, return -ENXIO); |
| t = tu->timeri->timer; |
| snd_assert(t != NULL, return -ENXIO); |
| memset(&info, 0, sizeof(info)); |
| info.card = t->card ? t->card->number : -1; |
| if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) |
| info.flags |= SNDRV_TIMER_FLG_SLAVE; |
| strncpy(info.id, t->id, sizeof(info.id)-1); |
| strncpy(info.name, t->name, sizeof(info.name)-1); |
| info.ticks = t->hw.ticks; |
| info.resolution = t->hw.resolution; |
| if (copy_to_user(_info, &info, sizeof(*_info))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int snd_timer_user_params(struct file *file, snd_timer_params_t *_params) |
| { |
| unsigned long flags; |
| snd_timer_user_t *tu; |
| snd_timer_params_t params; |
| snd_timer_t *t; |
| snd_timer_read_t *tr; |
| int err; |
| |
| tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO); |
| snd_assert(tu->timeri != NULL, return -ENXIO); |
| t = tu->timeri->timer; |
| snd_assert(t != NULL, return -ENXIO); |
| if (copy_from_user(¶ms, _params, sizeof(params))) |
| return -EFAULT; |
| if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { |
| err = -EINVAL; |
| goto _end; |
| } |
| if (params.queue_size > 0 && (params.queue_size < 32 || params.queue_size > 1024)) { |
| err = -EINVAL; |
| goto _end; |
| } |
| snd_timer_stop(tu->timeri); |
| spin_lock_irqsave(&t->lock, flags); |
| if (params.flags & SNDRV_TIMER_PSFLG_AUTO) { |
| tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; |
| } else { |
| tu->timeri->flags &= ~SNDRV_TIMER_IFLG_AUTO; |
| } |
| spin_unlock_irqrestore(&t->lock, flags); |
| if (params.queue_size > 0 && tu->queue_size != params.queue_size) { |
| tr = (snd_timer_read_t *)kmalloc(params.queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); |
| if (tr) { |
| kfree(tu->queue); |
| tu->queue_size = params.queue_size; |
| tu->queue = tr; |
| } |
| } |
| if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) { |
| tu->ticks = 1; |
| } else { |
| tu->ticks = params.ticks; |
| } |
| err = 0; |
| _end: |
| if (copy_to_user(_params, ¶ms, sizeof(params))) |
| return -EFAULT; |
| return err; |
| } |
| |
| static int snd_timer_user_status(struct file *file, snd_timer_status_t *_status) |
| { |
| unsigned long flags; |
| snd_timer_user_t *tu; |
| snd_timer_status_t status; |
| |
| tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO); |
| snd_assert(tu->timeri != NULL, return -ENXIO); |
| memset(&status, 0, sizeof(status)); |
| status.resolution = snd_timer_resolution(tu->timeri); |
| status.lost = tu->timeri->lost; |
| status.overrun = tu->overrun; |
| spin_lock_irqsave(&tu->qlock, flags); |
| status.queue = tu->qused; |
| spin_unlock_irqrestore(&tu->qlock, flags); |
| if (copy_to_user(_status, &status, sizeof(status))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int snd_timer_user_start(struct file *file) |
| { |
| int err; |
| snd_timer_user_t *tu; |
| |
| tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO); |
| snd_assert(tu->timeri != NULL, return -ENXIO); |
| snd_timer_stop(tu->timeri); |
| tu->timeri->lost = 0; |
| return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; |
| } |
| |
| static int snd_timer_user_stop(struct file *file) |
| { |
| int err; |
| snd_timer_user_t *tu; |
| |
| tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO); |
| snd_assert(tu->timeri != NULL, return -ENXIO); |
| return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; |
| } |
| |
| static int snd_timer_user_continue(struct file *file) |
| { |
| int err; |
| snd_timer_user_t *tu; |
| |
| tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO); |
| snd_assert(tu->timeri != NULL, return -ENXIO); |
| tu->timeri->lost = 0; |
| return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; |
| } |
| |
| static int snd_timer_user_ioctl(struct inode *inode, struct file *file, |
| unsigned int cmd, unsigned long arg) |
| { |
| snd_timer_user_t *tu; |
| |
| tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO); |
| switch (cmd) { |
| case SNDRV_TIMER_IOCTL_PVERSION: |
| return put_user(SNDRV_TIMER_VERSION, (int *)arg) ? -EFAULT : 0; |
| case SNDRV_TIMER_IOCTL_NEXT_DEVICE: |
| return snd_timer_user_next_device((snd_timer_id_t *)arg); |
| case SNDRV_TIMER_IOCTL_SELECT: |
| return snd_timer_user_tselect(file, (snd_timer_select_t *)arg); |
| case SNDRV_TIMER_IOCTL_INFO: |
| return snd_timer_user_info(file, (snd_timer_info_t *)arg); |
| case SNDRV_TIMER_IOCTL_PARAMS: |
| return snd_timer_user_params(file, (snd_timer_params_t *)arg); |
| case SNDRV_TIMER_IOCTL_STATUS: |
| return snd_timer_user_status(file, (snd_timer_status_t *)arg); |
| case SNDRV_TIMER_IOCTL_START: |
| return snd_timer_user_start(file); |
| case SNDRV_TIMER_IOCTL_STOP: |
| return snd_timer_user_stop(file); |
| case SNDRV_TIMER_IOCTL_CONTINUE: |
| return snd_timer_user_continue(file); |
| } |
| return -ENOTTY; |
| } |
| |
| static ssize_t snd_timer_user_read(struct file *file, char *buffer, size_t count, loff_t *offset) |
| { |
| snd_timer_user_t *tu; |
| long result = 0; |
| int err = 0; |
| |
| tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO); |
| while (count - result >= sizeof(snd_timer_read_t)) { |
| spin_lock_irq(&tu->qlock); |
| while (!tu->qused) { |
| wait_queue_t wait; |
| |
| if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { |
| spin_unlock_irq(&tu->qlock); |
| err = -EAGAIN; |
| break; |
| } |
| |
| set_current_state(TASK_INTERRUPTIBLE); |
| init_waitqueue_entry(&wait, current); |
| add_wait_queue(&tu->qchange_sleep, &wait); |
| |
| spin_unlock(&tu->qlock); |
| schedule(); |
| spin_lock_irq(&tu->qlock); |
| |
| remove_wait_queue(&tu->qchange_sleep, &wait); |
| set_current_state(TASK_RUNNING); |
| |
| if (signal_pending(current)) { |
| err = -ERESTARTSYS; |
| break; |
| } |
| } |
| spin_unlock_irq(&tu->qlock); |
| if (err < 0) |
| break; |
| |
| if (copy_to_user(buffer, &tu->queue[tu->qhead++], sizeof(snd_timer_read_t))) { |
| err = -EFAULT; |
| break; |
| } |
| |
| tu->qhead %= tu->queue_size; |
| spin_lock_irq(&tu->qlock); |
| tu->qused--; |
| spin_unlock_irq(&tu->qlock); |
| result += sizeof(snd_timer_read_t); |
| buffer += sizeof(snd_timer_read_t); |
| } |
| return result > 0 ? result : err; |
| } |
| |
| static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) |
| { |
| unsigned int mask; |
| snd_timer_user_t *tu; |
| |
| tu = snd_magic_cast(snd_timer_user_t, file->private_data, return 0); |
| |
| poll_wait(file, &tu->qchange_sleep, wait); |
| |
| mask = 0; |
| if (tu->qused) |
| mask |= POLLIN | POLLRDNORM; |
| |
| return mask; |
| } |
| |
| static struct file_operations snd_timer_f_ops = |
| { |
| #ifndef LINUX_2_2 |
| .owner = THIS_MODULE, |
| #endif |
| .read = snd_timer_user_read, |
| .open = snd_timer_user_open, |
| .release = snd_timer_user_release, |
| .poll = snd_timer_user_poll, |
| .ioctl = snd_timer_user_ioctl, |
| }; |
| |
| static snd_minor_t snd_timer_reg = |
| { |
| .comment = "timer", |
| .f_ops = &snd_timer_f_ops, |
| }; |
| |
| /* |
| * ENTRY functions |
| */ |
| |
| static snd_info_entry_t *snd_timer_proc_entry = NULL; |
| |
| static int __init alsa_timer_init(void) |
| { |
| int err; |
| snd_info_entry_t *entry; |
| |
| #ifdef SNDRV_OSS_INFO_DEV_TIMERS |
| snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, "system timer"); |
| #endif |
| if ((entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL)) != NULL) { |
| entry->content = SNDRV_INFO_CONTENT_TEXT; |
| entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128; |
| entry->c.text.read = snd_timer_proc_read; |
| if (snd_info_register(entry) < 0) { |
| snd_info_free_entry(entry); |
| entry = NULL; |
| } |
| } |
| snd_timer_proc_entry = entry; |
| if ((err = snd_timer_register_system()) < 0) |
| snd_printk(KERN_ERR "unable to register system timer (%i)\n", err); |
| if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, |
| NULL, 0, &snd_timer_reg, "timer"))<0) |
| snd_printk(KERN_ERR "unable to register timer device (%i)\n", err); |
| return 0; |
| } |
| |
| static void __exit alsa_timer_exit(void) |
| { |
| struct list_head *p, *n; |
| |
| snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); |
| /* unregister the system timer */ |
| list_for_each_safe(p, n, &snd_timer_list) { |
| snd_timer_t *timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); |
| snd_timer_unregister(timer); |
| } |
| if (snd_timer_proc_entry) { |
| snd_info_unregister(snd_timer_proc_entry); |
| snd_timer_proc_entry = NULL; |
| } |
| #ifdef SNDRV_OSS_INFO_DEV_TIMERS |
| snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); |
| #endif |
| } |
| |
| module_init(alsa_timer_init) |
| module_exit(alsa_timer_exit) |
| |
| EXPORT_SYMBOL(snd_timer_open); |
| EXPORT_SYMBOL(snd_timer_close); |
| EXPORT_SYMBOL(snd_timer_resolution); |
| EXPORT_SYMBOL(snd_timer_start); |
| EXPORT_SYMBOL(snd_timer_stop); |
| EXPORT_SYMBOL(snd_timer_del); |
| EXPORT_SYMBOL(snd_timer_continue); |
| EXPORT_SYMBOL(snd_timer_new); |
| EXPORT_SYMBOL(snd_timer_global_new); |
| EXPORT_SYMBOL(snd_timer_global_free); |
| EXPORT_SYMBOL(snd_timer_global_register); |
| EXPORT_SYMBOL(snd_timer_global_unregister); |
| EXPORT_SYMBOL(snd_timer_interrupt); |
| EXPORT_SYMBOL(snd_timer_system_resolution); |