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