#!/bin/sh
trap 'echo 240 > /sys/bus/i2c/devices/0-002d/pwm1;exit' 1 2 15

declare -i sleepint=5
declare -i temp=0
declare -i pwm=0
declare -i old_temp=0
declare -i var_pwm=240
declare -i max_temp=60
declare -i min_temp=46
declare -i max_pwm=240
declare -i min_pwm=0
declare -i pwm_interval=($max_pwm-$min_pwm)/16

echo 1 > /sys/bus/i2c/devices/0-002d/pwm1_enable
echo 240 > /sys/bus/i2c/devices/0-002d/pwm1
sleep 5

while true
do
	temp=`cat /sys/bus/i2c/devices/0-002d/temp2_input`
	temp=$temp/1000
	pwm=`cat /sys/bus/i2c/devices/0-002d/pwm1`
	if [[ $temp -lt $min_temp ]]; then
		var_pwm=0
		sleepint=10
	elif [[ $temp -gt $max_temp ]]; then
		var_pwm=240
		sleepint=20
	else
		if [[ $temp -lt $old_temp ]]; then
			if [[ $var_pwm -gt 0 ]]; then
				var_pwm=$var_pwm-$pwm_interval
				sleepint=5
			fi
		elif [[ $temp -gt $old_temp ]]; then
			if [[ $var_pwm -lt 240 ]]; then
				var_pwm=$var_pwm+$pwm_interval
				sleepint=5
			fi
		else
			sleepint=10
		fi
	fi
	old_temp=$temp
	echo $var_pwm > /sys/bus/i2c/devices/0-002d/pwm1
#	echo temp $temp pwm $pwm var_pwm $var_pwm sleepint $sleepint
	sleep $sleepint
done