nixos-config/scripts/amd-fan-control
2024-11-03 15:43:53 -03:00

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#!/usr/bin/env bash
set -e
DEVICE="$1" # eg: /sys/class/drm/card1/device
HWMON=$(echo "$DEVICE"/hwmon/hwmon*)
exit() {
echo "Setting controll to auto" >&2
echo 2 > "$HWMON/pwm1_enable"
}
trap exit EXIT INT
bail() {
echo "Error: $@" >&2
echo "Exiting..." >&2
exit 1
}
if ! [ -d $HWMON ]; then
bail "Invalid HWMON"
fi
TEMP_INPUT="$HWMON/temp2_input"
if ! [ -f $TEMP_INPUT ]; then
bail "Invalid TEMP_INPUT"
fi
MIN="$2"
MAX="$3"
echo "Running..." >&2
while true; do
TEMPERATURE_RAW=$(cat "$TEMP_INPUT")
TEMPERATURE="$(( $TEMPERATURE_RAW / 1000 ))"
# Remap from a number between 60_000..90_000 to 0..255
PWM=$(( ($TEMPERATURE - $MIN) * 255 / ($MAX - $MIN) ))
if [ "$PWM" -gt 255 ]; then
PWM=255
elif [ "$PWM" -lt 0 ]; then
PWM=0
fi
echo 1 > "$HWMON/pwm1_enable"
echo "$PWM" > "$HWMON/pwm1"
sleep .1s
done