#ifndef LIBBACKLIGHT_H
#define LIBBACKLIGHT_H
#include <pciaccess.h>

#ifdef __cplusplus
extern "C" {
#endif 

enum backlight_type {
	BACKLIGHT_RAW,
	BACKLIGHT_PLATFORM,
	BACKLIGHT_FIRMWARE,
};

struct backlight {
	char *path;
	int max_brightness;
	int brightness;
	enum backlight_type type;
};

/* 
 * Find and set up a backlight for the given PCI device or card/connector
 * combination. It is valid (and preferred) to provide both sets of information
 */
struct backlight *backlight_init(struct pci_device *dev, int card,
				 int connector_type, int connector_type_id);

/* Free backlight resources */
void backlight_destroy(struct backlight *backlight);

/* Provide the maximum backlight value */
long backlight_get_max_brightness(struct backlight *backlight);

/* Provide the cached backlight value */
long backlight_get_brightness(struct backlight *backlight);

/* Provide the hardware backlight value */
long backlight_get_actual_brightness(struct backlight *backlight);

/* Set the backlight to a value between 0 and max */
long backlight_set_brightness(struct backlight *backlight, long brightness);

#ifdef __cplusplus
}
#endif

#endif /* LIBBACKLIGHT_H */