#!/bin/sh

# script for setting/restoring xps13 kbd backlight state
# usable at boot a call within /etc/rc.local
# usable at resume|thaw linking it in /etc/pm/sleep.d
# from values defined in $BL_CONF
# without "#~ " prefix :
#~ ## 0 : off
#~ ## 1 : min
#~ ## 2 : max
#~ default=0
#~ current=1
#
# Cf http://askubuntu.com/questions/689907/dell-xps-13-9343-keyboard-backlight-on-at-boot-ubuntu-15-10
# Copyright: Copyright (c) 2015 r2rien
# License:   GPL-2
#
BL_CONF=/etc/xps13-kbd-backlight
[ -f $BL_CONF ] || exit 0

BL_SYS=/sys/class/leds/dell::kbd_backlight/brightness

BL_CONF_DEFAULT=$(grep ^default $BL_CONF |awk -F = '{print $NF}')
BL_CONF_CURRENT=$(grep ^current $BL_CONF |awk -F = '{print $NF}')
BL_SYS_CURRENT=$(cat $BL_SYS)

#~ echo "BL_CONF_DEFAULT: $BL_CONF_DEFAULT"
#~ echo "BL_CONF_CURRENT: $BL_CONF_CURRENT"
#~ echo "BL_SYS_CURRENT: $BL_SYS_CURRENT"
case "${1}" in
	suspend|suspend_hybrid|hibernate)
	# set in conf new current from sys
		sed -i "s/current=$BL_CONF_CURRENT/current=$BL_SYS_CURRENT/" $BL_CONF
		;;
	resume|thaw)
	# set from current in conf
		echo $BL_CONF_CURRENT > $BL_SYS
		;;
	*)
	# set from default in conf
		echo $BL_CONF_DEFAULT > $BL_SYS
		;;
esac