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// SPDX-License-Identifier: GPL-2.0+
/*
* PWM BACKLIGHT driver for Board based on EXYNOS.
*
* Author: Donghwa Lee <dh09.lee@samsung.com>
*
* Derived from linux/drivers/video/backlight/pwm_backlight.c
*/
#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;
}
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