Manual Pages  — BACKLIGHT

backlight, backlight_register, backlight_destroy, BACKLIGHT_GET_STATUS, BACKLIGHT_SET_STATUS – BACKLIGHT methods

SYNOPSIS DESCRIPTION INTERFACE FILES HISTORY

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);

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.

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.

/dev/backlight/*

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