FreeBSD manual
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BACKLIGHT(9) FreeBSD Kernel Developer's Manual 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>.
FreeBSD 14.0-RELEASE-p6 October 2, 2020 FreeBSD 14.0-RELEASE-p6