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#! /bin/sh
### BEGIN INIT INFO
# Provides: backlight
# Required-Start: $local_fs
# Required-Stop: $local_fs
# Default-Start: S 1 2 3 4 5
# Default-Stop: 0 6
# Short-Description: Save and restore screen and keyboard backlight level between restarts.
# Description: This script saves the screen and keyboard backlight level between restarts.
# It is called on all runlevels.
# Author: Norbert X <nrbrtx@gmail.com>
### END INIT INFO
PATH=/sbin:/bin:/usr/bin:/usr/sbin
CONTROLLERS_PATH=/sys/class/backlight/
SAVED_FILE_PREFIX=/var/lib/backlight-level-
CONTROLLERS_PATH_KBD=/sys/class/leds/
SAVED_FILE_PREFIX_KBD=/var/lib/backlight_kbd-level-
. /lib/init/vars.sh
. /lib/lsb/init-functions
from_files_to_sys() {
CONTROLLERS_PATH=$1;
SAVED_FILES=$2;
SHOW_OR_WRITE=$3;
for saved_file in $SAVED_FILES; do
saved_controller_name="$(echo $saved_file | cut -d '-' -f3)"
if [ -f "$CONTROLLERS_PATH$saved_controller_name/brightness" ]; then
if [ $SHOW_OR_WRITE = 'write' ]; then
printf "\tLoading $saved_controller_name = "
cat "$saved_file" | tee "$CONTROLLERS_PATH$saved_controller_name/brightness"
elif [ $SHOW_OR_WRITE = 'show' ]; then
printf "\tSaved brightness level for $saved_controller_name = $(cat $saved_file)\n"
fi
fi
done
}
from_sys_to_files() {
CONTROLLERS=$1;
SAVED_FILE_PREFIX=$2;
SHOW_OR_WRITE=$3;
for controller in $CONTROLLERS ; do
if [ -f "$controller/brightness" ]; then
controller_name="$(echo $controller | cut -d '/' -f5)"
if [ $SHOW_OR_WRITE = 'write' ]; then
printf "\tSaving $controller_name = ";
cat "$controller/brightness" | tee "$SAVED_FILE_PREFIX$controller_name";
elif [ $SHOW_OR_WRITE = 'show' ]; then
printf "\tCurrent brightness level for $controller_name = $(cat $controller/brightness)\n";
fi
fi
done
}
backlight_level () {
SAVED_FILES=$SAVED_FILE_PREFIX*
CONTROLLERS=$CONTROLLERS_PATH*/
SAVED_FILES_KBD=$SAVED_FILE_PREFIX_KBD*
CONTROLLERS_KBD=$CONTROLLERS_PATH_KBD*kbd*/
if [ "$1" = 'load' ]; then
echo "load"
from_files_to_sys "$CONTROLLERS_PATH" "$SAVED_FILES" 'write'
from_files_to_sys "$CONTROLLERS_PATH_KBD" "$SAVED_FILES_KBD" 'write'
elif [ "$1" = 'save' ]; then
echo "save"
from_sys_to_files "$CONTROLLERS" "$SAVED_FILE_PREFIX" 'write'
from_sys_to_files "$CONTROLLERS_KBD" "$SAVED_FILE_PREFIX_KBD" 'write'
elif [ "$1" = 'status' ]; then
echo "status"
from_sys_to_files "$CONTROLLERS" "$SAVED_FILE_PREFIX" 'show'
from_files_to_sys "$CONTROLLERS_PATH" "$SAVED_FILES" 'show'
from_sys_to_files "$CONTROLLERS_KBD" "$SAVED_FILE_PREFIX_KBD" 'show'
from_files_to_sys "$CONTROLLERS_PATH_KBD" "$SAVED_FILES_KBD" 'show'
fi
echo "$1 $? $(date)" >> /var/lib/backlight_debug
return $?
}
case "$1" in
start|"")
[ "$VERBOSE" = no ] || log_action_begin_msg "Initializing backlight level"
# Restore backlight level
backlight_level load
ES=$?
[ "$VERBOSE" = no ] || log_action_end_msg $ES
;;
stop)
# Save backlight level
[ "$VERBOSE" = no ] || log_action_begin_msg "Saving backlight level"
backlight_level save
ES=$?
[ "$VERBOSE" = no ] || log_action_end_msg $ES
;;
status)
backlight_level status
exit 0
;;
restart|reload|force-reload)
echo "Error: argument '$1' not supported" >&2
exit 3
;;
*)
echo "Usage: backlight start|stop|status" >&2
exit 3
;;
esac
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