recipes/display-brightness/display-brightness.sh

   1 #!/bin/sh
   2
   3 # display-brightness.sh
   4 # simple script to set display-brightness for zaurus clamshell
   5 # author: patrick steiner <patrick.steiner@a1.net>
   6 # version: 1.00 | 22.02.2005 23:20
   7
   8
   9 STEP=5
  10 DRIVER="`ls /sys/class/backlight/|head -n 1`"
  11 MAX_BRIGHTNESS=`cat /sys/class/backlight/$DRIVER/max_brightness`
  12 ACTUAL_BRIGHTNESS=`cat /sys/class/backlight/$DRIVER/actual_brightness`
  13 BRIGHTNESS_FILE="/sys/class/backlight/$DRIVER/brightness"
  14
  15 if test "$1" != "up" -a "$1" != "down" -a -n "$1"
  16 then
  17         echo -e "\nUsage:\n\t `basename $0` [up | down]\n"
  18         exit 0
  19 fi
  20
  21 echo "max / current"
  22 echo "$MAX_BRIGHTNESS / $ACTUAL_BRIGHTNESS"
  23 if [ ! -n "$1" ]; then
  24     exit 0
  25 fi
  26
  27 if [ "$1" = "up" ]; then
  28     if [ $ACTUAL_BRIGHTNESS -eq $MAX_BRIGHTNESS ]; then
  29         exit 0
  30     else
  31
  32         test -x /usr/bin/bl && bl on
  33         test "$STEP" -gt "$MAX_BRIGHTNESS" -o "$STEP" -eq "$MAX_BRIGHTNESS" && STEP=1
  34         let CURRENT_BRIGHTNESS=$ACTUAL_BRIGHTNESS+$STEP
  35         echo $CURRENT_BRIGHTNESS >> $BRIGHTNESS_FILE
  36         exit 0
  37     fi
  38 fi
  39
  40 if [ "$1" = "down" ]; then
  41     if [ $ACTUAL_BRIGHTNESS -lt 2 ]; then
  42         exit 0
  43     elif [ $ACTUAL_BRIGHTNESS -lt $STEP ]; then
  44         STEP=1
  45         let CURRENT_BRIGHTNESS=$ACTUAL_BRIGHTNESS-$STEP
  46         echo $CURRENT_BRIGHTNESS >> $BRIGHTNESS_FILE
  47         exit 0
  48     else
  49         let CURRENT_BRIGHTNESS=$ACTUAL_BRIGHTNESS-$STEP
  50         echo $CURRENT_BRIGHTNESS >> $BRIGHTNESS_FILE
  51         exit 0
  52     fi
  53 fi
  54