#!/bin/bash
# ========================================================
# Bash script for controlling Raspberry Pi's status LED
# Version 1.0 - by Thomas Schoch - www.retas.de
# ========================================================
function usage
{
echo '
led0 on (or 1) - switch LED on
led0 off (or 0) - switch LED off
led0 hb - pulse like heartbeat
led0 <n> <m> - pulse <n> ms on, <m> ms off
led0 sd - show SD card activity
'
exit 1
}
if (( $(id -u) != 0 ))
then
echo "You must be root to do this."
exit 2
fi
cd /sys/class/leds/led0
# we accept 1 or 2 arguments
#
if (( $# == 1 ))
then
# single argument: must be on, off, hb or sd
#
case $1
in 1|on) mode=1
;; 0|off) mode=0
;; hb|sd) mode=$1
;; *) usage
esac
if [[ $mode = hb ]]
then
modprobe ledtrig_heartbeat
echo heartbeat > trigger
elif [[ $mode = sd ]]
then
echo mmc0 > trigger
else
echo none > trigger
echo $mode > brightness
fi
elif (( $# == 2 ))
then
# 2 arguments: must be numeric
#
shopt -s extglob
[[ $1 = +([0-9]) && $2 = +([0-9]) ]] || usage
modprobe ledtrig_timer
echo timer > trigger
echo $1 > delay_on
echo $2 > delay_off
else
usage
fi
exit 0