1234567891011121314151617181920212223242526272829303132333435363738394041424344 |
- // 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;
- }
|