#!/bin/sh

# Physical  | V | Mode | Name     | wPi | GPIO
# 8         | 0 | OUT  | TXD.3    | 3   | 13
readonly FAN_PIN="13"
readonly FAN_PATH=/sys/class/gpio/gpio${FAN_PIN}

readonly MSG_ON="Fan ON!"
readonly MSG_OFF="Fan OFF!"
old_state=$(cat $FAN_PATH/value)

setup()
{
    echo $FAN_PIN > /sys/class/gpio/export
    echo "out" > $FAN_PATH/direction
    echo 0 > $FAN_PATH/value
}
cleanup()
{
    echo 0 > $FAN_PATH/value
    echo $FAN_PIN > /sys/class/gpio/unexport
}

on()
{
    echo 1 > $FAN_PATH/value
}
off()
{
    echo 0 > $FAN_PATH/value
}
case $1 in
    on|off ) "$1";;
esac

cur_state=$(cat $FAN_PATH/value)
if [ "$old_state" != "$cur_state" ] && [ -z "$2" ]; then
    if [ "$cur_state" = 0 ]; then
        echo $MSG_OFF
    else
        echo $MSG_ON
    fi
fi