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leds: convert blink timer to workqueue 

This patch converts the blink timer from led-core to workqueue which is more
suitable for this kind of non-priority operations. Moreover, timer may lead to
errors when a LED setting function use a scheduling function such as pinctrl
which is using mutex.

Signed-off-by: Vincent Donnefort <vdonnefort@gmail.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
hifive-unleashed-5.1
Vincent Donnefort 2014-06-14 02:21:40 -07:00 committed by Bryan Wu
parent 7e7743901b
commit 8b37e1bef5
3 changed files with 14 additions and 14 deletions
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14
drivers/leds/led-class.c
View File

@ -15,10 +15,10 @@
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/timer.h>
#include <linux/err.h>
#include <linux/ctype.h>
#include <linux/leds.h>
#include <linux/workqueue.h>
#include "leds.h"
static struct class *leds_class;
@ -97,9 +97,10 @@ static const struct attribute_group *led_groups[] = {
NULL,
};
static void led_timer_function(unsigned long data)
static void led_work_function(struct work_struct *ws)
{
struct led_classdev *led_cdev = (void *)data;
struct led_classdev *led_cdev =
container_of(ws, struct led_classdev, blink_work.work);
unsigned long brightness;
unsigned long delay;
@ -143,7 +144,8 @@ static void led_timer_function(unsigned long data)
}
}
mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
queue_delayed_work(system_wq, &led_cdev->blink_work,
msecs_to_jiffies(delay));
}
static void set_brightness_delayed(struct work_struct *ws)
@ -231,9 +233,7 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
init_timer(&led_cdev->blink_timer);
led_cdev->blink_timer.function = led_timer_function;
led_cdev->blink_timer.data = (unsigned long)led_cdev;
INIT_DELAYED_WORK(&led_cdev->blink_work, led_work_function);
#ifdef CONFIG_LEDS_TRIGGERS
led_trigger_set_default(led_cdev);

11
drivers/leds/led-core.c
View File

@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/rwsem.h>
#include <linux/leds.h>
#include <linux/workqueue.h>
#include "leds.h"
DECLARE_RWSEM(leds_list_lock);
@ -51,7 +52,7 @@ static void led_set_software_blink(struct led_classdev *led_cdev,
return;
}
mod_timer(&led_cdev->blink_timer, jiffies + 1);
queue_delayed_work(system_wq, &led_cdev->blink_work, 1);
}
@ -75,7 +76,7 @@ void led_blink_set(struct led_classdev *led_cdev,
unsigned long *delay_on,
unsigned long *delay_off)
{
del_timer_sync(&led_cdev->blink_timer);
cancel_delayed_work_sync(&led_cdev->blink_work);
led_cdev->flags &= ~LED_BLINK_ONESHOT;
led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
@ -90,7 +91,7 @@ void led_blink_set_oneshot(struct led_classdev *led_cdev,
int invert)
{
if ((led_cdev->flags & LED_BLINK_ONESHOT) &&
timer_pending(&led_cdev->blink_timer))
delayed_work_pending(&led_cdev->blink_work))
return;
led_cdev->flags |= LED_BLINK_ONESHOT;
@ -107,7 +108,7 @@ EXPORT_SYMBOL(led_blink_set_oneshot);
void led_stop_software_blink(struct led_classdev *led_cdev)
{
del_timer_sync(&led_cdev->blink_timer);
cancel_delayed_work_sync(&led_cdev->blink_work);
led_cdev->blink_delay_on = 0;
led_cdev->blink_delay_off = 0;
}
@ -116,7 +117,7 @@ EXPORT_SYMBOL_GPL(led_stop_software_blink);
void led_set_brightness(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
/* delay brightness setting if need to stop soft-blink timer */
/* delay brightness setting if need to stop soft-blink work */
if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) {
led_cdev->delayed_set_value = brightness;
schedule_work(&led_cdev->set_brightness_work);

3
include/linux/leds.h
View File

@ -15,7 +15,6 @@
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/rwsem.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
struct device;
@ -69,7 +68,7 @@ struct led_classdev {
const char *default_trigger; /* Trigger to use */
unsigned long blink_delay_on, blink_delay_off;
struct timer_list blink_timer;
struct delayed_work blink_work;
int blink_brightness;
struct work_struct set_brightness_work;