root/include/linux/pwm_backlight.h

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/*
 * Generic PWM backlight driver data - see drivers/video/backlight/pwm_bl.c
 */
#ifndef __LINUX_PWM_BACKLIGHT_H
#define __LINUX_PWM_BACKLIGHT_H

#include <linux/backlight.h>

struct platform_pwm_backlight_data {
        int pwm_id;
        unsigned int max_brightness;
        unsigned int dft_brightness;
        unsigned int lth_brightness;
        unsigned int pwm_period_ns;
        unsigned int *levels;
        /* TODO remove once all users are switched to gpiod_* API */
        int enable_gpio;
        int (*init)(struct device *dev);
        int (*notify)(struct device *dev, int brightness);
        void (*notify_after)(struct device *dev, int brightness);
        void (*exit)(struct device *dev);
        int (*check_fb)(struct device *dev, struct fb_info *info);
};

#endif
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