pfan

#!/bin/sh
#
# MyRPI script to control the usb connected fan on
# the 2nd port using uhubctl
#
# Cornjob to run every 2 hours
# 0 */2 * * *  /bin/pfan >/dev/null 2>&1
#
# Valid inputs:
# ON  - 1
# OFF - 0
#

#DEFAULTS
treshold=50.0

fan_state() {
    fs=`uhub | awk 'FNR == 3 {print $4}'`
    if [ $fs = 'power' ]; then
	return 1
    else
	return 0
    fi
}

out_chk() {
    if [ $1 -eq 0 ] && [ $2 -eq 0 ]; then
        echo "Fan turned OFF"
    elif [ $1 -eq 0 ] && [ $2 -eq 1 ]; then
        echo "Fan turned ON"
    elif [ $2 -ne 0 ] || [ $2 -ne 1 ]; then
        echo "-------------------------"
        echo "No valid arg provided!"
        echo " "
        echo "Nothing to do here!"
        echo "-------------------------"
    else
        echo "Something went wrong"
    fi
}

if [ -z $1 ]; then
    echo "Checking temp to decide!!"
    get_temp=`vcgencmd measure_temp | cut -d '=' -f 2,3 | cut -d "'" -f 1,1`

    echo "Current Temp: $get_temp"

    temp_chk=`echo "$get_temp >= $treshold" | bc -l`
    if [ $temp_chk -eq 1 ]; then
	echo "PI Hot"
	fan_state
	chk_state=$?
	if [ $chk_state -eq 1 ]; then
	    echo "Fan is already running"
	else
	    uhub -a 1 -p 2 > /dev/null 2> /dev/null
	    chk=$?
	    prov_in=1
	    out_chk $chk $prov_in
	fi
    else
	echo "alight kul"
	fan_state
        chk_state=$?
        if [ $chk_state -eq 0 ]; then
		echo "Fan is already OFF"
	else
	    uhub -a 0 -p 2 > /dev/null 2> /dev/null
	    chk=$?
            prov_in=0
            out_chk $chk $prov_in
	fi
    fi
elif [ $1 = 'state' ]; then
    fan_state
    cur_state=$?
    if [ $cur_state -eq 1 ]; then
        echo "Current fan state is: ON"
    else
	echo "Current fan state is: OFF"
    fi
else
    prov_in=$1
    fan_state
    chk_state=$?
    if [ $chk_state -eq 1 ] && [ $prov_in -eq 1 ]; then
	echo "Fan is already running"
    elif [ $chk_state -eq 0 ] && [ $prov_in -eq 0 ]; then
        echo "Fan is already OFF"
    else
        uhub -a $prov_in -p 2 > /dev/null 2> /dev/null
        chk=$?
        out_chk $chk $prov_in
    fi
fi