microsoft
/
WSL2-Linux-Kernel
зеркало из https://github.com/microsoft/WSL2-Linux-Kernel.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
WSL2-Linux-Kernel/sound/core/timer.c

1939 строки
51 KiB
C
Исходник Ответственный История

/*
* 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/smp_lock.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/moduleparam.h>
#include <linux/string.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_HPET) || defined(CONFIG_SND_HPET_MODULE)
#define DEFAULT_TIMER_LIMIT 3
#elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
#define DEFAULT_TIMER_LIMIT 2
#else
#define DEFAULT_TIMER_LIMIT 1
#endif
static 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_param(timer_limit, int, 0444);
MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
typedef struct {
snd_timer_instance_t *timeri;
int tread; /* enhanced read with timestamps and events */
unsigned long ticks;
unsigned long overrun;
int qhead;
int qtail;
int qused;
int queue_size;
snd_timer_read_t *queue;
snd_timer_tread_t *tqueue;
spinlock_t qlock;
unsigned long last_resolution;
unsigned int filter;
struct timespec tstamp; /* trigger tstamp */
wait_queue_head_t qchange_sleep;
struct fasync_struct *fasync;
struct semaphore tread_sem;
} 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 DEFINE_SPINLOCK(slave_active_lock);
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 = kcalloc(1, sizeof(*timeri), GFP_KERNEL);
if (timeri == NULL)
return NULL;
timeri->owner = kstrdup(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->ack_list);
INIT_LIST_HEAD(&timeri->slave_list_head);
INIT_LIST_HEAD(&timeri->slave_active_head);
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)
{
if (! current->fs->root)
return;
switch (tid->dev_class) {
case SNDRV_TIMER_CLASS_GLOBAL:
if (tid->device < timer_limit)
request_module("snd-timer-%i", tid->device);
break;
case SNDRV_TIMER_CLASS_CARD:
case SNDRV_TIMER_CLASS_PCM:
if (tid->card < snd_ecards_limit)
request_module("snd-card-%i", tid->card);
break;
default:
break;
}
}
#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);
spin_lock_irq(&slave_active_lock);
slave->master = master;
slave->timer = master->timer;
spin_unlock_irq(&slave_active_lock);
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;
/* 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_irq(&slave_active_lock);
slave->master = master;
slave->timer = master->timer;
if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
list_add_tail(&slave->active_list, &master->slave_active_head);
spin_unlock_irq(&slave_active_lock);
}
}
}
/*
* open a timer instance
* when opening a master, the slave id must be here given.
*/
int snd_timer_open(snd_timer_instance_t **ti,
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 -EINVAL;
}
down(&register_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(&register_mutex);
*ti = timeri;
return 0;
}
/* open a master instance */
down(&register_mutex);
timer = snd_timer_find(tid);
#ifdef CONFIG_KMOD
if (timer == NULL) {
up(&register_mutex);
snd_timer_request(tid);
down(&register_mutex);
timer = snd_timer_find(tid);
}
#endif
if (timer) {
if (!list_empty(&timer->open_list_head)) {
timeri = (snd_timer_instance_t *)list_entry(timer->open_list_head.next, snd_timer_instance_t, open_list);
if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
up(&register_mutex);
return -EBUSY;
}
}
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);
}
} else {
up(&register_mutex);
return -ENODEV;
}
up(&register_mutex);
*ti = timeri;
return 0;
}
static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event);
/*
* close a timer instance
*/
int snd_timer_close(snd_timer_instance_t * timeri)
{
snd_timer_t *timer = NULL;
struct list_head *p, *n;
snd_timer_instance_t *slave;
snd_assert(timeri != NULL, return -ENXIO);
/* force to stop the timer */
snd_timer_stop(timeri);
if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
/* wait, until the active callback is finished */
spin_lock_irq(&slave_active_lock);
while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
spin_unlock_irq(&slave_active_lock);
udelay(10);
spin_lock_irq(&slave_active_lock);
}
spin_unlock_irq(&slave_active_lock);
down(&register_mutex);
list_del(&timeri->open_list);
up(&register_mutex);
} else {
timer = timeri->timer;
/* wait, until the active callback is finished */
spin_lock_irq(&timer->lock);
while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
spin_unlock_irq(&timer->lock);
udelay(10);
spin_lock_irq(&timer->lock);
}
spin_unlock_irq(&timer->lock);
down(&register_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);
spin_lock_irq(&slave_active_lock);
_snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
list_del(p);
list_add_tail(p, &snd_timer_slave_list);
slave->master = NULL;
slave->timer = NULL;
spin_unlock_irq(&slave_active_lock);
}
up(&register_mutex);
}
if (timeri->private_free)
timeri->private_free(timeri);
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 void snd_timer_notify1(snd_timer_instance_t *ti, enum sndrv_timer_event event)
{
snd_timer_t *timer;
unsigned long flags;
unsigned long resolution = 0;
snd_timer_instance_t *ts;
struct list_head *n;
struct timespec tstamp;
snd_timestamp_now(&tstamp, 1);
snd_assert(event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE, return);
if (event == SNDRV_TIMER_EVENT_START || event == SNDRV_TIMER_EVENT_CONTINUE)
resolution = snd_timer_resolution(ti);
if (ti->ccallback)
ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
return;
timer = ti->timer;
if (timer == NULL)
return;
if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
return;
spin_lock_irqsave(&timer->lock, flags);
list_for_each(n, &ti->slave_active_head) {
ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
if (ts->ccallback)
ts->ccallback(ti, event + 100, &tstamp, resolution);
}
spin_unlock_irqrestore(&timer->lock, flags);
}
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) {
if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
goto __start_now;
timer->flags |= SNDRV_TIMER_FLG_RESCHED;
timeri->flags |= SNDRV_TIMER_IFLG_START;
return 1; /* delayed start */
} else {
timer->sticks = sticks;
timer->hw.start(timer);
__start_now:
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 */
}
/*
* start the timer instance
*/
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) {
result = snd_timer_start_slave(timeri);
snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
return result;
}
timer = timeri->timer;
if (timer == NULL)
return -EINVAL;
spin_lock_irqsave(&timer->lock, flags);
timeri->ticks = timeri->cticks = ticks;
timeri->pticks = 0;
result = snd_timer_start1(timer, timeri, ticks);
spin_unlock_irqrestore(&timer->lock, flags);
snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
return result;
}
static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event)
{
snd_timer_t *timer;
unsigned long flags;
snd_assert(timeri != NULL, return -ENXIO);
if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
if (!keep_flag) {
spin_lock_irqsave(&slave_active_lock, flags);
timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
spin_unlock_irqrestore(&slave_active_lock, flags);
}
goto __end;
}
timer = timeri->timer;
if (!timer)
return -EINVAL;
spin_lock_irqsave(&timer->lock, flags);
list_del_init(&timeri->ack_list);
list_del_init(&timeri->active_list);
if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
!(--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);
}
}
}
if (!keep_flag)
timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING|SNDRV_TIMER_IFLG_START);
spin_unlock_irqrestore(&timer->lock, flags);
__end:
if (event != SNDRV_TIMER_EVENT_RESOLUTION)
snd_timer_notify1(timeri, event);
return 0;
}
/*
* 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;
int err;
err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
if (err < 0)
return err;
timer = timeri->timer;
spin_lock_irqsave(&timer->lock, flags);
timeri->cticks = timeri->ticks;
timeri->pticks = 0;
spin_unlock_irqrestore(&timer->lock, flags);
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;
timeri->pticks = 0;
result = snd_timer_start1(timer, timeri, timer->sticks);
spin_unlock_irqrestore(&timer->lock, flags);
snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
return result;
}
/*
* pause.. remember the ticks left
*/
int snd_timer_pause(snd_timer_instance_t * timeri)
{
return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
}
/*
* 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 tasklet
*
*/
static void snd_timer_tasklet(unsigned long arg)
{
snd_timer_t *timer = (snd_timer_t *) arg;
snd_timer_instance_t *ti;
struct list_head *p;
unsigned long resolution, ticks;
spin_lock(&timer->lock);
/* now process all callbacks */
while (!list_empty(&timer->sack_list_head)) {
p = timer->sack_list_head.next; /* get first item */
ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
/* remove from ack_list and make empty */
list_del_init(p);
ticks = ti->pticks;
ti->pticks = 0;
resolution = ti->resolution;
ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
spin_unlock(&timer->lock);
if (ti->callback)
ti->callback(ti, resolution, ticks);
spin_lock(&timer->lock);
ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
}
spin_unlock(&timer->lock);
}
/*
* 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, ticks;
struct list_head *p, *q, *n;
int use_tasklet = 0;
if (timer == NULL)
return;
spin_lock(&timer->lock);
/* remember the current resolution */
if (timer->hw.c_resolution)
resolution = timer->hw.c_resolution(timer);
else
resolution = timer->hw.resolution;
/* 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))
continue;
ti->pticks += ticks_left;
ti->resolution = resolution;
if (ti->cticks < ticks_left)
ti->cticks = 0;
else
ti->cticks -= ticks_left;
if (ti->cticks) /* not expired */
continue;
if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
ti->cticks = ti->ticks;
} else {
ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
if (--timer->running)
list_del(p);
}
if (list_empty(&ti->ack_list)) {
if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
(ti->flags & SNDRV_TIMER_IFLG_FAST)) {
list_add_tail(&ti->ack_list, &timer->ack_list_head);
} else {
list_add_tail(&ti->ack_list, &timer->sack_list_head);
}
}
list_for_each(q, &ti->slave_active_head) {
ts = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, active_list);
ts->pticks = ti->pticks;
ts->resolution = resolution;
if (list_empty(&ts->ack_list)) {
if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
(ti->flags & SNDRV_TIMER_IFLG_FAST)) {
list_add_tail(&ts->ack_list, &timer->ack_list_head);
} else {
list_add_tail(&ts->ack_list, &timer->sack_list_head);
}
}
}
}
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);
}
/* now process all fast callbacks */
while (!list_empty(&timer->ack_list_head)) {
p = timer->ack_list_head.next; /* get first item */
ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
/* remove from ack_list and make empty */
list_del_init(p);
ticks = ti->pticks;
ti->pticks = 0;
ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
spin_unlock(&timer->lock);
if (ti->callback)
ti->callback(ti, resolution, ticks);
spin_lock(&timer->lock);
ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
}
/* do we have any slow callbacks? */
use_tasklet = !list_empty(&timer->sack_list_head);
spin_unlock(&timer->lock);
if (use_tasklet)
tasklet_hi_schedule(&timer->task_queue);
}
/*
*/
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 = kcalloc(1, sizeof(*timer), 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)
strlcpy(timer->id, id, sizeof(timer->id));
INIT_LIST_HEAD(&timer->device_list);
INIT_LIST_HEAD(&timer->open_list_head);
INIT_LIST_HEAD(&timer->active_list_head);
INIT_LIST_HEAD(&timer->ack_list_head);
INIT_LIST_HEAD(&timer->sack_list_head);
spin_lock_init(&timer->lock);
tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer);
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);
kfree(timer);
return 0;
}
static int snd_timer_dev_free(snd_device_t *device)
{
snd_timer_t *timer = device->device_data;
return snd_timer_free(timer);
}
static int snd_timer_dev_register(snd_device_t *dev)
{
snd_timer_t *timer = dev->device_data;
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(&register_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(&register_mutex);
return -EBUSY;
}
list_add_tail(&timer->device_list, p);
up(&register_mutex);
return 0;
}
static 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(&register_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(&register_mutex);
return snd_timer_free(timer);
}
static int snd_timer_dev_unregister(snd_device_t *device)
{
snd_timer_t *timer = device->device_data;
return snd_timer_unregister(timer);
}
void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp)
{
unsigned long flags;
unsigned long resolution = 0;
snd_timer_instance_t *ti, *ts;
struct list_head *p, *n;
snd_runtime_check(timer->hw.flags & SNDRV_TIMER_HW_SLAVE, return);
snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && event <= SNDRV_TIMER_EVENT_MRESUME, return);
spin_lock_irqsave(&timer->lock, flags);
if (event == SNDRV_TIMER_EVENT_MSTART ||
event == SNDRV_TIMER_EVENT_MCONTINUE ||
event == SNDRV_TIMER_EVENT_MRESUME) {
if (timer->hw.c_resolution)
resolution = timer->hw.c_resolution(timer);
else
resolution = timer->hw.resolution;
}
list_for_each(p, &timer->active_list_head) {
ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
if (ti->ccallback)
ti->ccallback(ti, event, tstamp, resolution);
list_for_each(n, &ti->slave_active_head) {
ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
if (ts->ccallback)
ts->ccallback(ts, event, tstamp, resolution);
}
}
spin_unlock_irqrestore(&timer->lock, flags);
}
/*
* 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
*/
struct snd_timer_system_private {
struct timer_list tlist;
struct timer * timer;
unsigned long last_expires;
unsigned long last_jiffies;
unsigned long correction;
};
static void snd_timer_s_function(unsigned long data)
{
snd_timer_t *timer = (snd_timer_t *)data;
struct snd_timer_system_private *priv = timer->private_data;
unsigned long jiff = jiffies;
if (time_after(jiff, priv->last_expires))
priv->correction = (long)jiff - (long)priv->last_expires;
snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
}
static int snd_timer_s_start(snd_timer_t * timer)
{
struct snd_timer_system_private *priv;
unsigned long njiff;
priv = (struct snd_timer_system_private *) timer->private_data;
njiff = (priv->last_jiffies = jiffies);
if (priv->correction > timer->sticks - 1) {
priv->correction -= timer->sticks - 1;
njiff++;
} else {
njiff += timer->sticks - priv->correction;
priv->correction -= timer->sticks;
}
priv->last_expires = priv->tlist.expires = njiff;
add_timer(&priv->tlist);
return 0;
}
static int snd_timer_s_stop(snd_timer_t * timer)
{
struct snd_timer_system_private *priv;
unsigned long jiff;
priv = (struct snd_timer_system_private *) timer->private_data;
del_timer(&priv->tlist);
jiff = jiffies;
if (time_before(jiff, priv->last_expires))
timer->sticks = priv->last_expires - jiff;
else
timer->sticks = 1;
return 0;
}
static struct _snd_timer_hardware snd_timer_system =
{
.flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
.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)
{
kfree(timer->private_data);
}
static int snd_timer_register_system(void)
{
snd_timer_t *timer;
struct snd_timer_system_private *priv;
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;
priv = kcalloc(1, sizeof(*priv), GFP_KERNEL);
if (priv == NULL) {
snd_timer_free(timer);
return -ENOMEM;
}
init_timer(&priv->tlist);
priv->tlist.function = snd_timer_s_function;
priv->tlist.data = (unsigned long) timer;
timer->private_data = priv;
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(&register_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(&register_mutex);
}
/*
* USER SPACE interface
*/
static void snd_timer_user_interrupt(snd_timer_instance_t *timeri,
unsigned long resolution,
unsigned long ticks)
{
snd_timer_user_t *tu = timeri->callback_data;
snd_timer_read_t *r;
int prev;
spin_lock(&tu->qlock);
if (tu->qused > 0) {
prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
r = &tu->queue[prev];
if (r->resolution == resolution) {
r->ticks += ticks;
goto __wake;
}
}
if (tu->qused >= tu->queue_size) {
tu->overrun++;
} else {
r = &tu->queue[tu->qtail++];
tu->qtail %= tu->queue_size;
r->resolution = resolution;
r->ticks = ticks;
tu->qused++;
}
__wake:
spin_unlock(&tu->qlock);
kill_fasync(&tu->fasync, SIGIO, POLL_IN);
wake_up(&tu->qchange_sleep);
}
static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu, snd_timer_tread_t *tread)
{
if (tu->qused >= tu->queue_size) {
tu->overrun++;
} else {
memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
tu->qtail %= tu->queue_size;
tu->qused++;
}
}
static void snd_timer_user_ccallback(snd_timer_instance_t *timeri,
enum sndrv_timer_event event,
struct timespec *tstamp,
unsigned long resolution)
{
snd_timer_user_t *tu = timeri->callback_data;
snd_timer_tread_t r1;
if (event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE)
tu->tstamp = *tstamp;
if ((tu->filter & (1 << event)) == 0 || !tu->tread)
return;
r1.event = event;
r1.tstamp = *tstamp;
r1.val = resolution;
spin_lock(&tu->qlock);
snd_timer_user_append_to_tqueue(tu, &r1);
spin_unlock(&tu->qlock);
kill_fasync(&tu->fasync, SIGIO, POLL_IN);
wake_up(&tu->qchange_sleep);
}
static void snd_timer_user_tinterrupt(snd_timer_instance_t *timeri,
unsigned long resolution,
unsigned long ticks)
{
snd_timer_user_t *tu = timeri->callback_data;
snd_timer_tread_t *r, r1;
struct timespec tstamp;
int prev, append = 0;
snd_timestamp_zero(&tstamp);
spin_lock(&tu->qlock);
if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION)|(1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
spin_unlock(&tu->qlock);
return;
}
if (tu->last_resolution != resolution || ticks > 0)
snd_timestamp_now(&tstamp, 1);
if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) {
r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
r1.tstamp = tstamp;
r1.val = resolution;
snd_timer_user_append_to_tqueue(tu, &r1);
tu->last_resolution = resolution;
append++;
}
if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
goto __wake;
if (ticks == 0)
goto __wake;
if (tu->qused > 0) {
prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
r = &tu->tqueue[prev];
if (r->event == SNDRV_TIMER_EVENT_TICK) {
r->tstamp = tstamp;
r->val += ticks;
append++;
goto __wake;
}
}
r1.event = SNDRV_TIMER_EVENT_TICK;
r1.tstamp = tstamp;
r1.val = ticks;
snd_timer_user_append_to_tqueue(tu, &r1);
append++;
__wake:
spin_unlock(&tu->qlock);
if (append == 0)
return;
kill_fasync(&tu->fasync, SIGIO, POLL_IN);
wake_up(&tu->qchange_sleep);
}
static int snd_timer_user_open(struct inode *inode, struct file *file)
{
snd_timer_user_t *tu;
tu = kcalloc(1, sizeof(*tu), GFP_KERNEL);
if (tu == NULL)
return -ENOMEM;
spin_lock_init(&tu->qlock);
init_waitqueue_head(&tu->qchange_sleep);
init_MUTEX(&tu->tread_sem);
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) {
kfree(tu);
return -ENOMEM;
}
file->private_data = tu;
return 0;
}
static int snd_timer_user_release(struct inode *inode, struct file *file)
{
snd_timer_user_t *tu;
if (file->private_data) {
tu = file->private_data;
file->private_data = NULL;
fasync_helper(-1, file, 0, &tu->fasync);
if (tu->timeri)
snd_timer_close(tu->timeri);
kfree(tu->queue);
kfree(tu->tqueue);
kfree(tu);
}
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 __user *_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(&register_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(&register_mutex);
if (copy_to_user(_tid, &id, sizeof(*_tid)))
return -EFAULT;
return 0;
}
static int snd_timer_user_ginfo(struct file *file, snd_timer_ginfo_t __user *_ginfo)
{
snd_timer_ginfo_t *ginfo;
snd_timer_id_t tid;
snd_timer_t *t;
struct list_head *p;
int err = 0;
ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
if (! ginfo)
return -ENOMEM;
if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
kfree(ginfo);
return -EFAULT;
}
tid = ginfo->tid;
memset(ginfo, 0, sizeof(*ginfo));
ginfo->tid = tid;
down(&register_mutex);
t = snd_timer_find(&tid);
if (t != NULL) {
ginfo->card = t->card ? t->card->number : -1;
if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
ginfo->resolution = t->hw.resolution;
if (t->hw.resolution_min > 0) {
ginfo->resolution_min = t->hw.resolution_min;
ginfo->resolution_max = t->hw.resolution_max;
}
list_for_each(p, &t->open_list_head) {
ginfo->clients++;
}
} else {
err = -ENODEV;
}
up(&register_mutex);
if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
err = -EFAULT;
kfree(ginfo);
return err;
}
static int snd_timer_user_gparams(struct file *file, snd_timer_gparams_t __user *_gparams)
{
snd_timer_gparams_t gparams;
snd_timer_t *t;
int err;
if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
return -EFAULT;
down(&register_mutex);
t = snd_timer_find(&gparams.tid);
if (t != NULL) {
if (list_empty(&t->open_list_head)) {
if (t->hw.set_period)
err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
else
err = -ENOSYS;
} else {
err = -EBUSY;
}
} else {
err = -ENODEV;
}
up(&register_mutex);
return err;
}
static int snd_timer_user_gstatus(struct file *file, snd_timer_gstatus_t __user *_gstatus)
{
snd_timer_gstatus_t gstatus;
snd_timer_id_t tid;
snd_timer_t *t;
int err = 0;
if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
return -EFAULT;
tid = gstatus.tid;
memset(&gstatus, 0, sizeof(gstatus));
gstatus.tid = tid;
down(&register_mutex);
t = snd_timer_find(&tid);
if (t != NULL) {
if (t->hw.c_resolution)
gstatus.resolution = t->hw.c_resolution(t);
else
gstatus.resolution = t->hw.resolution;
if (t->hw.precise_resolution) {
t->hw.precise_resolution(t, &gstatus.resolution_num, &gstatus.resolution_den);
} else {
gstatus.resolution_num = gstatus.resolution;
gstatus.resolution_den = 1000000000uL;
}
} else {
err = -ENODEV;
}
up(&register_mutex);
if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
err = -EFAULT;
return err;
}
static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *_tselect)
{
snd_timer_user_t *tu;
snd_timer_select_t tselect;
char str[32];
int err = 0;
tu = file->private_data;
down(&tu->tread_sem);
if (tu->timeri) {
snd_timer_close(tu->timeri);
tu->timeri = NULL;
}
if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
err = -EFAULT;
goto __err;
}
sprintf(str, "application %i", current->pid);
if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
if ((err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid)) < 0)
goto __err;
kfree(tu->queue);
tu->queue = NULL;
kfree(tu->tqueue);
tu->tqueue = NULL;
if (tu->tread) {
tu->tqueue = (snd_timer_tread_t *)kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
if (tu->tqueue == NULL)
err = -ENOMEM;
} else {
tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
if (tu->queue == NULL)
err = -ENOMEM;
}
if (err < 0) {
snd_timer_close(tu->timeri);
tu->timeri = NULL;
} else {
tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
tu->timeri->ccallback = snd_timer_user_ccallback;
tu->timeri->callback_data = (void *)tu;
}
__err:
up(&tu->tread_sem);
return err;
}
static int snd_timer_user_info(struct file *file, snd_timer_info_t __user *_info)
{
snd_timer_user_t *tu;
snd_timer_info_t *info;
snd_timer_t *t;
int err = 0;
tu = file->private_data;
snd_assert(tu->timeri != NULL, return -ENXIO);
t = tu->timeri->timer;
snd_assert(t != NULL, return -ENXIO);
info = kcalloc(1, sizeof(*info), GFP_KERNEL);
if (! info)
return -ENOMEM;
info->card = t->card ? t->card->number : -1;
if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
info->flags |= SNDRV_TIMER_FLG_SLAVE;
strlcpy(info->id, t->id, sizeof(info->id));
strlcpy(info->name, t->name, sizeof(info->name));
info->resolution = t->hw.resolution;
if (copy_to_user(_info, info, sizeof(*_info)))
err = -EFAULT;
kfree(info);
return err;
}
static int snd_timer_user_params(struct file *file, snd_timer_params_t __user *_params)
{
snd_timer_user_t *tu;
snd_timer_params_t params;
snd_timer_t *t;
snd_timer_read_t *tr;
snd_timer_tread_t *ttr;
int err;
tu = file->private_data;
snd_assert(tu->timeri != NULL, return -ENXIO);
t = tu->timeri->timer;
snd_assert(t != NULL, return -ENXIO);
if (copy_from_user(&params, _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;
}
if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
(1<<SNDRV_TIMER_EVENT_TICK)|
(1<<SNDRV_TIMER_EVENT_START)|
(1<<SNDRV_TIMER_EVENT_STOP)|
(1<<SNDRV_TIMER_EVENT_CONTINUE)|
(1<<SNDRV_TIMER_EVENT_PAUSE)|
(1<<SNDRV_TIMER_EVENT_SUSPEND)|
(1<<SNDRV_TIMER_EVENT_RESUME)|
(1<<SNDRV_TIMER_EVENT_MSTART)|
(1<<SNDRV_TIMER_EVENT_MSTOP)|
(1<<SNDRV_TIMER_EVENT_MCONTINUE)|
(1<<SNDRV_TIMER_EVENT_MPAUSE)|
(1<<SNDRV_TIMER_EVENT_MSUSPEND)|
(1<<SNDRV_TIMER_EVENT_MRESUME))) {
err = -EINVAL;
goto _end;
}
snd_timer_stop(tu->timeri);
spin_lock_irq(&t->lock);
tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
SNDRV_TIMER_IFLG_EXCLUSIVE|
SNDRV_TIMER_IFLG_EARLY_EVENT);
if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
spin_unlock_irq(&t->lock);
if (params.queue_size > 0 && (unsigned int)tu->queue_size != params.queue_size) {
if (tu->tread) {
ttr = (snd_timer_tread_t *)kmalloc(params.queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
if (ttr) {
kfree(tu->tqueue);
tu->queue_size = params.queue_size;
tu->tqueue = ttr;
}
} else {
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;
}
}
}
tu->qhead = tu->qtail = tu->qused = 0;
if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
if (tu->tread) {
snd_timer_tread_t tread;
tread.event = SNDRV_TIMER_EVENT_EARLY;
tread.tstamp.tv_sec = 0;
tread.tstamp.tv_nsec = 0;
tread.val = 0;
snd_timer_user_append_to_tqueue(tu, &tread);
} else {
snd_timer_read_t *r = &tu->queue[0];
r->resolution = 0;
r->ticks = 0;
tu->qused++;
tu->qtail++;
}
}
tu->filter = params.filter;
tu->ticks = params.ticks;
err = 0;
_end:
if (copy_to_user(_params, &params, sizeof(params)))
return -EFAULT;
return err;
}
static int snd_timer_user_status(struct file *file, snd_timer_status_t __user *_status)
{
snd_timer_user_t *tu;
snd_timer_status_t status;
tu = file->private_data;
snd_assert(tu->timeri != NULL, return -ENXIO);
memset(&status, 0, sizeof(status));
status.tstamp = tu->tstamp;
status.resolution = snd_timer_resolution(tu->timeri);
status.lost = tu->timeri->lost;
status.overrun = tu->overrun;
spin_lock_irq(&tu->qlock);
status.queue = tu->qused;
spin_unlock_irq(&tu->qlock);
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 = file->private_data;
snd_assert(tu->timeri != NULL, return -ENXIO);
snd_timer_stop(tu->timeri);
tu->timeri->lost = 0;
tu->last_resolution = 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 = file->private_data;
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 = file->private_data;
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_pause(struct file *file)
{
int err;
snd_timer_user_t *tu;
tu = file->private_data;
snd_assert(tu->timeri != NULL, return -ENXIO);
return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
}
enum {
SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
};
static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
snd_timer_user_t *tu;
void __user *argp = (void __user *)arg;
int __user *p = argp;
tu = file->private_data;
switch (cmd) {
case SNDRV_TIMER_IOCTL_PVERSION:
return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
return snd_timer_user_next_device(argp);
case SNDRV_TIMER_IOCTL_TREAD:
{
int xarg;
down(&tu->tread_sem);
if (tu->timeri) { /* too late */
up(&tu->tread_sem);
return -EBUSY;
}
if (get_user(xarg, p)) {
up(&tu->tread_sem);
return -EFAULT;
}
tu->tread = xarg ? 1 : 0;
up(&tu->tread_sem);
return 0;
}
case SNDRV_TIMER_IOCTL_GINFO:
return snd_timer_user_ginfo(file, argp);
case SNDRV_TIMER_IOCTL_GPARAMS:
return snd_timer_user_gparams(file, argp);
case SNDRV_TIMER_IOCTL_GSTATUS:
return snd_timer_user_gstatus(file, argp);
case SNDRV_TIMER_IOCTL_SELECT:
return snd_timer_user_tselect(file, argp);
case SNDRV_TIMER_IOCTL_INFO:
return snd_timer_user_info(file, argp);
case SNDRV_TIMER_IOCTL_PARAMS:
return snd_timer_user_params(file, argp);
case SNDRV_TIMER_IOCTL_STATUS:
return snd_timer_user_status(file, argp);
case SNDRV_TIMER_IOCTL_START:
case SNDRV_TIMER_IOCTL_START_OLD:
return snd_timer_user_start(file);
case SNDRV_TIMER_IOCTL_STOP:
case SNDRV_TIMER_IOCTL_STOP_OLD:
return snd_timer_user_stop(file);
case SNDRV_TIMER_IOCTL_CONTINUE:
case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
return snd_timer_user_continue(file);
case SNDRV_TIMER_IOCTL_PAUSE:
case SNDRV_TIMER_IOCTL_PAUSE_OLD:
return snd_timer_user_pause(file);
}
return -ENOTTY;
}
static int snd_timer_user_fasync(int fd, struct file * file, int on)
{
snd_timer_user_t *tu;
int err;
tu = file->private_data;
err = fasync_helper(fd, file, on, &tu->fasync);
if (err < 0)
return err;
return 0;
}
static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
{
snd_timer_user_t *tu;
long result = 0, unit;
int err = 0;
tu = file->private_data;
unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t);
spin_lock_irq(&tu->qlock);
while ((long)count - result >= unit) {
while (!tu->qused) {
wait_queue_t wait;
if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
err = -EAGAIN;
break;
}
set_current_state(TASK_INTERRUPTIBLE);
init_waitqueue_entry(&wait, current);
add_wait_queue(&tu->qchange_sleep, &wait);
spin_unlock_irq(&tu->qlock);
schedule();
spin_lock_irq(&tu->qlock);
remove_wait_queue(&tu->qchange_sleep, &wait);
if (signal_pending(current)) {
err = -ERESTARTSYS;
break;
}
}
spin_unlock_irq(&tu->qlock);
if (err < 0)
goto _error;
if (tu->tread) {
if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], sizeof(snd_timer_tread_t))) {
err = -EFAULT;
goto _error;
}
} else {
if (copy_to_user(buffer, &tu->queue[tu->qhead++], sizeof(snd_timer_read_t))) {
err = -EFAULT;
goto _error;
}
}
tu->qhead %= tu->queue_size;
result += unit;
buffer += unit;
spin_lock_irq(&tu->qlock);
tu->qused--;
}
spin_unlock_irq(&tu->qlock);
_error:
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 = file->private_data;
poll_wait(file, &tu->qchange_sleep, wait);
mask = 0;
if (tu->qused)
mask |= POLLIN | POLLRDNORM;
return mask;
}
#ifdef CONFIG_COMPAT
#include "timer_compat.c"
#else
#define snd_timer_user_ioctl_compat NULL
#endif
static struct file_operations snd_timer_f_ops =
{
.owner = THIS_MODULE,
.read = snd_timer_user_read,
.open = snd_timer_user_open,
.release = snd_timer_user_release,
.poll = snd_timer_user_poll,
.unlocked_ioctl = snd_timer_user_ioctl,
.compat_ioctl = snd_timer_user_ioctl_compat,
.fasync = snd_timer_user_fasync,
};
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->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_continue);
EXPORT_SYMBOL(snd_timer_pause);
EXPORT_SYMBOL(snd_timer_new);
EXPORT_SYMBOL(snd_timer_notify);
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);
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку