BACKLIGHT(9)

NAME
backlight, backlight_register, backlight_destroy, BACKLIGHT_GET_STATUS, BACKLIGHT_SET_STATUS, - BACKLIGHT methods

SYNOPSIS
device backlight
#include <backlight_if.h>
#include <sys/sys/backlight.h>
int
BACKLIGHT_GET_STATUS(device_t bus, struct backlight_props *props);
int
BACKLIGHT_SET_STATUS(device_t bus, struct backlight_props *props);
struct cdev *
backlight_register(const char *name, device_t dev);
int
backlight_destroy(struct cdev *cdev);

DESCRIPTION
The backlight driver provides a generic way for handling a panel backlight.

Drivers for backlight system register themselves globally using the backlight_register() function. They must define two methods, BACKLIGHT_GET_STATUS() which is used to query the current brightness level and BACKLIGHT_SET_STATUS() which is used to update it.

INTERFACE

BACKLIGHT_GET_STATUS(device_t bus, struct backlight_props *props)
    Driver fills the current brightless level and the optional supported levels.

BACKLIGHT_SET_STATUS(device_t bus, struct backlight_props *props)
    Driver update the backlight level based on the brightness member of the props struct.

FILES

/dev/backlight/*

HISTORY
The backlight interface first appear in FreeBSD 13.0. The backlight driver and manual page was written by Emmanuel Vadot <manu@FreeBSD.org>.