86 lines
1.5 KiB
Bash
Executable file
86 lines
1.5 KiB
Bash
Executable file
#!/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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TEMP_MIN="$2"
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TEMP_MAX="$3"
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if [ -z "$TEMP_MIN" ];then
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bail "No minimum temperature provided"
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fi
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if [ -z "$TEMP_MAX" ];then
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bail "No maximum temperature provided"
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fi
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PWM_MIN_PCT="$4"
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PWM_MAX_PCT="$5"
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if [ -z "$PWM_MIN_PCT" ];then
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bail "No minimum fan speed % not provided"
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fi
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if [ -z "$PWM_MAX_PCT" ];then
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bail "No maximum fan speed % not provided"
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fi
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PWM_MIN="$(( $PWM_MIN_PCT * 255 / 100))"
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PWM_MAX="$(( $PWM_MAX_PCT * 255 / 100))"
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echo "Running..." >&2
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echo "TEMP_MIN=$TEMP_MIN°C"
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echo "TEMP_MAX=$TEMP_MAX°C"
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echo "FAN_MIN=$PWM_MIN_PCT%"
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echo "FAN_MAX=$PWM_MAX_PCT%"
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echo 1 > "$HWMON/pwm1_enable"
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PREV=0
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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 - $TEMP_MIN) * $PWM_MAX / ($TEMP_MAX - $TEMP_MIN) ))
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if [ "$PWM" -gt $PWM_MAX ]; then
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PWM=$PWM_MAX
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elif [ "$PWM" -lt $PWM_MIN ]; then
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PWM=$PWM_MIN
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fi
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AVG="$(( ($PWM * 20 + $PREV * 80) / 100 ))"
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echo "$AVG"
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echo "$AVG" > "$HWMON/pwm1"
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PREV="$AVG"
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sleep .1s
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done
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