mirror of
https://github.com/kuhyx/wake-alarm.git
synced 2026-07-04 13:43:01 +02:00
53 lines
1.5 KiB
Bash
53 lines
1.5 KiB
Bash
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#!/bin/bash
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# Control CPU/case fan speed for the wake alarm.
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#
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# Usage:
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# wake-alarm-fans.sh max — ramp all NCT fans to 100%
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# wake-alarm-fans.sh restore <enable> <pwm> — restore saved values
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#
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# Must be run as root (installed in /etc/sudoers.d/wake-alarm via install.sh).
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# Safe: fans are designed to run at max speed indefinitely.
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set -euo pipefail
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# Locate the hwmon directory for any NCT Super I/O fan controller.
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HWMON=""
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for name_file in /sys/class/hwmon/hwmon*/name; do
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[[ -f "$name_file" ]] || continue
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chip=$(cat "$name_file")
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case "$chip" in
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nct6775|nct6779|nct6791|nct6792|nct6793|nct6795|nct6796|nct6797|nct6798|nct6799)
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HWMON=$(dirname "$name_file")
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break
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;;
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esac
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done
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if [[ -z "$HWMON" ]]; then
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# Not an error — hardware without this chip just skips fan control.
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exit 0
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fi
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PWM_PATH="$HWMON/pwm1"
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ENABLE_PATH="$HWMON/pwm1_enable"
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case "${1:-}" in
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max)
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echo 1 > "$ENABLE_PATH" # Switch to manual mode
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echo 255 > "$PWM_PATH" # 255/255 = 100% speed
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;;
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restore)
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if [[ $# -ne 3 ]]; then
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echo "Usage: $0 restore <old_enable> <old_pwm>" >&2
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exit 1
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fi
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# Restore pwm value first, then restore the control mode.
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echo "${3}" > "$PWM_PATH"
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echo "${2}" > "$ENABLE_PATH"
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;;
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*)
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echo "Usage: $0 max | $0 restore <old_enable> <old_pwm>" >&2
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exit 1
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;;
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esac
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