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https://github.com/AsahiLinux/u-boot
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1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
45 lines
926 B
C
45 lines
926 B
C
/*
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* PWM BACKLIGHT driver for Board based on EXYNOS.
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*
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* Author: Donghwa Lee <dh09.lee@samsung.com>
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*
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* Derived from linux/drivers/video/backlight/pwm_backlight.c
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <pwm.h>
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#include <linux/types.h>
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#include <asm/io.h>
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#include <asm/arch/cpu.h>
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#include <asm/arch/gpio.h>
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#include <asm/arch/pwm.h>
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#include <asm/arch/pwm_backlight.h>
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static struct pwm_backlight_data *pwm;
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static int exynos_pwm_backlight_update_status(void)
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{
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int brightness = pwm->brightness;
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int max = pwm->max_brightness;
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if (brightness == 0) {
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pwm_config(pwm->pwm_id, 0, pwm->period);
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pwm_disable(pwm->pwm_id);
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} else {
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pwm_config(pwm->pwm_id,
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brightness * pwm->period / max, pwm->period);
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pwm_enable(pwm->pwm_id);
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}
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return 0;
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}
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int exynos_pwm_backlight_init(struct pwm_backlight_data *pd)
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{
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pwm = pd;
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exynos_pwm_backlight_update_status();
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return 0;
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}
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