Script to set the fan speed on Ampere server

setFans.sh

#! /bin/sh

# Alex Ellis 18th Nov 2020
# Updated for the 1U unit, which has 7 fans

logo () {
echo ""
echo "             ▄██▄"
echo "            ▄█  █▄"
echo "           ▄█    █▄"
echo "       ▄▄▄▄█  ▄▄▄ █▄"
echo "   ▄█▀▀▀ ▄█      ▀██▄"
echo " ▄█▀    ▄█         ▀█▄"
echo " A M P E R E COMPUTING"
}

display_usage () {
        echo ""
        echo "Usage: ./setFans.sh auto //Enable Cooling Manager"
        echo "Usage: ./setFans.sh N    //Set fan PWM to N%"
        echo ""
}

set_fan () {
        echo -n "Setting fan $1 to "
        decPWM=$(printf "%d" $2)
        echo -n "$decPWM%. "
        fanStat=$(ipmitool raw 0x3C 0x14 $1 $2) #set fan pwm
        if [ "$fanStat" = " 00" ]; then
                echo "Success"
        else
                echo "Failed"
        fi
}

logo

if [  $# -ne 1 ]; then
        display_usage
        exit 1
fi
if [ "$1" = "auto" ]; then
        #Enable cooling manager
        cmStat=$(ipmitool raw 0x3C 0x0B 0x00)
        echo -n "Cooling manager "
        if [ "$cmStat" = " 00" ]; then
                echo "enabled"
                echo "Fan speed auto"
        else
                echo "disabled"
                echo "Fan speed manual"
        fi

else
        #Convert decimal pwm to hex
        hexPWM=$(printf "0x%02x" $1)

        #Disable cooling manager
        cmStat=$(ipmitool raw 0x3C 0x0b 0x01)
        echo -n "Cooling manager "
        if [ "$cmStat" = " 01" ]; then
                echo "disabled"
                echo "Fan speed manual"
        else
                echo "enabled"
                echo "Fan speed auto"
        fi
        sleep 1

        #Set the fans
        for nFan in {2..7}
        do
                set_fan $nFan $hexPWM
        done
fi