8b37e1bef5
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>
130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
/*
|
|
* LED Class Core
|
|
*
|
|
* Copyright 2005-2006 Openedhand Ltd.
|
|
*
|
|
* Author: Richard Purdie <rpurdie@openedhand.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/module.h>
|
|
#include <linux/rwsem.h>
|
|
#include <linux/leds.h>
|
|
#include <linux/workqueue.h>
|
|
#include "leds.h"
|
|
|
|
DECLARE_RWSEM(leds_list_lock);
|
|
EXPORT_SYMBOL_GPL(leds_list_lock);
|
|
|
|
LIST_HEAD(leds_list);
|
|
EXPORT_SYMBOL_GPL(leds_list);
|
|
|
|
static void led_set_software_blink(struct led_classdev *led_cdev,
|
|
unsigned long delay_on,
|
|
unsigned long delay_off)
|
|
{
|
|
int current_brightness;
|
|
|
|
current_brightness = led_get_brightness(led_cdev);
|
|
if (current_brightness)
|
|
led_cdev->blink_brightness = current_brightness;
|
|
if (!led_cdev->blink_brightness)
|
|
led_cdev->blink_brightness = led_cdev->max_brightness;
|
|
|
|
led_cdev->blink_delay_on = delay_on;
|
|
led_cdev->blink_delay_off = delay_off;
|
|
|
|
/* never on - just set to off */
|
|
if (!delay_on) {
|
|
__led_set_brightness(led_cdev, LED_OFF);
|
|
return;
|
|
}
|
|
|
|
/* never off - just set to brightness */
|
|
if (!delay_off) {
|
|
__led_set_brightness(led_cdev, led_cdev->blink_brightness);
|
|
return;
|
|
}
|
|
|
|
queue_delayed_work(system_wq, &led_cdev->blink_work, 1);
|
|
}
|
|
|
|
|
|
static void led_blink_setup(struct led_classdev *led_cdev,
|
|
unsigned long *delay_on,
|
|
unsigned long *delay_off)
|
|
{
|
|
if (!(led_cdev->flags & LED_BLINK_ONESHOT) &&
|
|
led_cdev->blink_set &&
|
|
!led_cdev->blink_set(led_cdev, delay_on, delay_off))
|
|
return;
|
|
|
|
/* blink with 1 Hz as default if nothing specified */
|
|
if (!*delay_on && !*delay_off)
|
|
*delay_on = *delay_off = 500;
|
|
|
|
led_set_software_blink(led_cdev, *delay_on, *delay_off);
|
|
}
|
|
|
|
void led_blink_set(struct led_classdev *led_cdev,
|
|
unsigned long *delay_on,
|
|
unsigned long *delay_off)
|
|
{
|
|
cancel_delayed_work_sync(&led_cdev->blink_work);
|
|
|
|
led_cdev->flags &= ~LED_BLINK_ONESHOT;
|
|
led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
|
|
|
|
led_blink_setup(led_cdev, delay_on, delay_off);
|
|
}
|
|
EXPORT_SYMBOL(led_blink_set);
|
|
|
|
void led_blink_set_oneshot(struct led_classdev *led_cdev,
|
|
unsigned long *delay_on,
|
|
unsigned long *delay_off,
|
|
int invert)
|
|
{
|
|
if ((led_cdev->flags & LED_BLINK_ONESHOT) &&
|
|
delayed_work_pending(&led_cdev->blink_work))
|
|
return;
|
|
|
|
led_cdev->flags |= LED_BLINK_ONESHOT;
|
|
led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
|
|
|
|
if (invert)
|
|
led_cdev->flags |= LED_BLINK_INVERT;
|
|
else
|
|
led_cdev->flags &= ~LED_BLINK_INVERT;
|
|
|
|
led_blink_setup(led_cdev, delay_on, delay_off);
|
|
}
|
|
EXPORT_SYMBOL(led_blink_set_oneshot);
|
|
|
|
void led_stop_software_blink(struct led_classdev *led_cdev)
|
|
{
|
|
cancel_delayed_work_sync(&led_cdev->blink_work);
|
|
led_cdev->blink_delay_on = 0;
|
|
led_cdev->blink_delay_off = 0;
|
|
}
|
|
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 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);
|
|
return;
|
|
}
|
|
|
|
__led_set_brightness(led_cdev, brightness);
|
|
}
|
|
EXPORT_SYMBOL(led_set_brightness);
|