#!/bin/bash
LED1=22
LED2=27
SHUTDOWN=3 

case "$1" in
start)
    # LED init
    echo "$LED1" > /sys/class/gpio/export
    echo "$LED2" > /sys/class/gpio/export
    echo out > /sys/class/gpio/gpio$LED1/direction
    echo 0 > /sys/class/gpio/gpio$LED1/value
    echo out > /sys/class/gpio/gpio$LED2/direction
    echo 1 > /sys/class/gpio/gpio$LED2/value

    #Button init
    echo "$SHUTDOWN" > /sys/class/gpio/export 
    echo "in" > /sys/class/gpio/gpio$SHUTDOWN/direction 
    #This loop continuously checks if the shutdown button was pressed 
    #It sleeps as long as that has not happened. 
    buttonstate1=$(cat /sys/class/gpio/gpio$SHUTDOWN/value)
    shutdownSignal=$(cat /sys/class/gpio/gpio$SHUTDOWN/value)
    while [ $shutdownSignal = $buttonstate1 ]; do 
        shutdownSignal=$(cat /sys/class/gpio/gpio$SHUTDOWN/value)
        sleep 0.5
    done
    shutdown -h now 
;;
stop)
      #unexport all GPIOs
       #echo "$SHUTDOWN" > /sys/class/gpio/unexport 
       echo "$LED1" > /sys/class/gpio/unexport 
       echo "$LED2" > /sys/class/gpio/unexport 
;;
esac
exit $?