Manual fancontrol on Raspberry Pi 5 for Ubuntu 23.10 64bit

fancontrol.sh

#!/bin/bash

round() {
        printf "%.${2}f" "${1}"
}

debug() {
        if [[ $debug -eq 1 ]]; then
                echo "[$(date)] [DEBUG] $1" >> "$2"
        fi
}

log() {
        echo "[$(date)] [LOG] $1" >> "$2"
}

# Default values
speed0=0.25
temp0=68

speed1=0.4
temp1=75

speed2=0.75
temp2=80

debug=0
logfile=/var/log/fancontrol

if [ "$EUID" -ne 0 ]
then
  echo "Please run as root"
  exit
fi

# Parse parameters
while [[ $# -gt 0 ]]; do
    case "$1" in
        -s0 | --speed0 )
                speed0="$2"
                shift 2
                ;;
        -t0 | --temp0 )
                temp0="$2"
                shift 2
                ;;
        -s1 | --speed1 )
                speed1="$2"
                shift 2
                ;;
        -t1 | --temp1 )
                temp1="$2"
                shift 2
                ;;
        -s2 | --speed2 )
                speed2="$2"
                shift 2
                ;;
        -t2 | --temp2 )
                temp2="$2"
                shift 2
                ;;
        -d | --debug )
                debug=1
                shift
                ;;
        * )
            echo "Unknown parameter: $1"
            exit 1
            ;;
    esac
done

# Main script logic using the parsed parameters
debug "Temps: $temp0,$temp1,$temp2" $logfile
debug "Speeds: $speed0,$speed1,$speed2" $logfile
if lsmod | grep -wq "pwm_fan"; then
        debug "pwm_fan module found. Unloading." $logfile
        rmmod pwm_fan
else
        debug "pwm_fan module not loaded. Doing nothing." $logfile
fi

if [[ -d "/sys/class/pwm/pwmchip0/pwm3" ]]; then
        debug "pwm3 already exported. Doing nothing." $logfile
else
        debug "Exporting pwm3." $logfile
        echo 3 > /sys/class/pwm/pwmchip0/export
fi

cur_temp=$(round $(vcgencmd measure_temp | cut -d'=' -f2 | cut -d"'" -f1) 0)
period=$(cat /sys/class/pwm/pwmchip0/pwm3/period)

speed=$speed3
if [[ $cur_temp -le $temp0 ]]; then
        speed=$speed0
elif [[ $cur_temp -le $temp1 ]]; then
        speed=$speed1
else
        speed=$speed2
fi

tmp=$(echo "$speed*$period" | bc)
duty_cycle=$(round $tmp 0)

log "temp: $cur_temp - speed: $speed - duty_cycle: $duty_cycle." $logfile

echo 1 > /sys/class/pwm/pwmchip0/pwm3/enable
echo $duty_cycle > /sys/class/pwm/pwmchip0/pwm3/duty_cycle