xref: /freebsd/libexec/rc/rc.d/backlight (revision c45bdb39fe985b43afc63b7cbd989fe7a61673b7)

#!/bin/sh -
#
# Copyright (c) 2026 Kyle Evans <kevans@FreeBSD.org>
#
# SPDX-License-Identifier: BSD-2-Clause
#

# PROVIDE: backlight
# REQUIRE: FILESYSTEMS kld
# KEYWORD: nojail shutdown

. /etc/rc.subr

name="backlight"
desc="Save and restore backlight values"
rcvar="backlight_enable"
stop_cmd="backlight_stop"
start_cmd="backlight_start"
reload_cmd="backlight_start"
extra_commands="reload"

backlightdb="/var/db/backlight"

#
# List current backlight devices to stdout.
#
list_backlights()
{
	( cd /dev/backlight ; ls backlight* 2>/dev/null )
}

#
# Save state of an individual backlight specified as $1
#
backlight_save()
{
	local dev

	dev="/dev/backlight/$1"
	if [ -r "$dev" ]; then
		/usr/bin/backlight -f "$dev" -q > "$backlightdb/$1-state" 2>/dev/null
	fi
}

#
# Restore the state of an individual backlight specified as $1
#
backlight_restore()
{
	local file dev

	dev="/dev/backlight/$1"
	file="$backlightdb/$1-state"
	if [ -r "$dev" -a -r "$file" ]; then
		/usr/bin/backlight -f "$dev" $(cat "$file") > /dev/null
	fi
}

#
# Restore state of all backlights
#
backlight_start()
{
	local backlight

	for backlight in $(list_backlights); do
		backlight_restore "$backlight"
	done
}

#
# Save the state of all backlights
#
backlight_stop()
{
	local backlight

	for backlight in $(list_backlights); do
		backlight_save "$backlight"
	done
}

load_rc_config $name

# doesn't make sense to run in a svcj: config setting
backlight_svcj="NO"

run_rc_command "$1"