#!/bin/bash
#
# demonstration: reading fan speed from adm9240
#
# Copyright (C) 2005 Grant Coady <gcoady@gmail.com>
#
# GPLv2 per linux/COPYING by reference
# 
devpath="/sys/bus/i2c/devices/0-002d"
#
case $1 in
	1) fanpath="$devpath/fan1_input";;
	2) fanpath="$devpath/fan2_input";;
	*) echo -e "\n\tUsage: $0 <fan_number>\n"; exit 1;;
esac

retry=1
retry_max=3

echo -e "\n\tReading $fanpath"
read fan_rpm < "$fanpath"

while [ $fan_rpm -eq 0 -a $retry -le $retry_max ]; do
	echo -e "\twait for retry $retry"
	sleep 2
	read fan_rpm < "$fanpath"
	(( retry++ ))
done
echo -e "\tFan $1 rpm = $fan_rpm\n"