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BACKLIGHT(9)		    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  back-
     light_register()	function.    They   must   define   two  methods,  BACK-
     LIGHT_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 sup-
	     ported 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/*

SEE ALSO
     backlight(8)

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 ports 15.1		 October 2, 2020		    BACKLIGHT(9)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=backlight&sektion=9&manpath=FreeBSD+15.1-RELEASE+and+Ports>

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