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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 back-
       light.

       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 sup-
	       ported levels.

       BACKLIGHT_SET_STATUS(device_t bus, struct backlight_props *props)
	       Driver  update the backlight level based	on the brightness mem-
	       ber 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	13.2			October	2, 2020			  BACKLIGHT(9)
NAME | SYNOPSIS | DESCRIPTION | INTERFACE | FILES | HISTORY

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<https://man.freebsd.org/cgi/man.cgi?query=backlight&sektion=9&manpath=FreeBSD+14.2-RELEASE+and+Ports>

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