mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-10 23:24:38 +00:00
08a7aa1e5b
Move all the exynos video drivers into one place for ease of maintenance. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Anatolij Gustschin <agust@denx.de> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
45 lines
926 B
C
45 lines
926 B
C
/*
|
|
* PWM BACKLIGHT driver for Board based on EXYNOS.
|
|
*
|
|
* Author: Donghwa Lee <dh09.lee@samsung.com>
|
|
*
|
|
* Derived from linux/drivers/video/backlight/pwm_backlight.c
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <pwm.h>
|
|
#include <linux/types.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/cpu.h>
|
|
#include <asm/arch/gpio.h>
|
|
#include <asm/arch/pwm.h>
|
|
#include <asm/arch/pwm_backlight.h>
|
|
|
|
static struct pwm_backlight_data *pwm;
|
|
|
|
static int exynos_pwm_backlight_update_status(void)
|
|
{
|
|
int brightness = pwm->brightness;
|
|
int max = pwm->max_brightness;
|
|
|
|
if (brightness == 0) {
|
|
pwm_config(pwm->pwm_id, 0, pwm->period);
|
|
pwm_disable(pwm->pwm_id);
|
|
} else {
|
|
pwm_config(pwm->pwm_id,
|
|
brightness * pwm->period / max, pwm->period);
|
|
pwm_enable(pwm->pwm_id);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int exynos_pwm_backlight_init(struct pwm_backlight_data *pd)
|
|
{
|
|
pwm = pd;
|
|
|
|
exynos_pwm_backlight_update_status();
|
|
|
|
return 0;
|
|
}
|