diff options
Diffstat (limited to 'roms/u-boot/drivers/video/exynos/exynos_pwm_bl.c')
| -rw-r--r-- | roms/u-boot/drivers/video/exynos/exynos_pwm_bl.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/video/exynos/exynos_pwm_bl.c b/roms/u-boot/drivers/video/exynos/exynos_pwm_bl.c new file mode 100644 index 000000000..a3d467aa2 --- /dev/null +++ b/roms/u-boot/drivers/video/exynos/exynos_pwm_bl.c @@ -0,0 +1,44 @@ +// 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; +} |