]>
git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/video/exynos/exynos_pwm_bl.c
2 * PWM BACKLIGHT driver for Board based on EXYNOS.
4 * Author: Donghwa Lee <dh09.lee@samsung.com>
6 * Derived from linux/drivers/video/backlight/pwm_backlight.c
8 * SPDX-License-Identifier: GPL-2.0+
13 #include <linux/types.h>
15 #include <asm/arch/cpu.h>
16 #include <asm/arch/gpio.h>
17 #include <asm/arch/pwm.h>
18 #include <asm/arch/pwm_backlight.h>
20 static struct pwm_backlight_data
*pwm
;
22 static int exynos_pwm_backlight_update_status(void)
24 int brightness
= pwm
->brightness
;
25 int max
= pwm
->max_brightness
;
27 if (brightness
== 0) {
28 pwm_config(pwm
->pwm_id
, 0, pwm
->period
);
29 pwm_disable(pwm
->pwm_id
);
31 pwm_config(pwm
->pwm_id
,
32 brightness
* pwm
->period
/ max
, pwm
->period
);
33 pwm_enable(pwm
->pwm_id
);
38 int exynos_pwm_backlight_init(struct pwm_backlight_data
*pd
)
42 exynos_pwm_backlight_update_status();