Updated Asus Screenpad Management service to support Gnome lock screen events

This updated script provides an additional systemd service to manage and restore the screenpad state when locking the device and the original service for resuming from sleep on Asus laptops with a Screenpad installed.

This has been tested with the Asus UX482EG but it should… work with other models.

Note that this requires that the package Asus WMI Screenpad is installed.

Screen Management Script

The script ran by both the screenpad-sleeper.service & screenpad-lock.service:

#!/bin/sh

# Get the current brightness 0 indicates that it is offline
BRIGHTNESS_FILE="/var/tmp/screenpad_brightness"
BRIGHTNESS_SYS_FILE="/sys/class/leds/asus::screenpad/brightness"

store_brightness() {
    cat "$BRIGHTNESS_SYS_FILE" > "$BRIGHTNESS_FILE"
}

restore_brightness() {
    if [ -f "$BRIGHTNESS_FILE" ]; then
        STORED_BRIGHTNESS=$(cat "$BRIGHTNESS_FILE")
        if [ "$STORED_BRIGHTNESS" -gt 0 ]; then
            # screenpad 1
            echo "$STORED_BRIGHTNESS" > "$BRIGHTNESS_SYS_FILE"
        else
            screenpad off
        fi
        rm "$BRIGHTNESS_FILE"
    else
        screenpad off
    fi
}

on_lock() {
    gdbus monitor -y -d org.freedesktop.login1 | 
    while read -r line; do
        if [[ $line =~ \'LockedHint\':\ \<([^>]+)\> ]]; then
            locked_hint="${BASH_REMATCH[1],,}"  # Convert to lowercase
            if [ "$locked_hint" = "true" ]; then
                store_brightness
                screenpad off
                echo "LockedHint: true"
            else
                restore_brightness
                echo "LockedHint: false"
            fi
        fi
    done
}

if [ "$1" = "pre" ]; then
    store_brightness
    screenpad off
elif [ "$1" = "post" ]; then
    restore_brightness
elif [ "$1" = "onlock" ]; then
    on_lock
fi

The screenpad-lock.service:

[Unit]
Description=Monitor GNOME screen lock status
After=graphical.target

[Service]
ExecStart=/usr/local/bin/screenpad_wake_helper.sh onlock
Restart=always

[Install]
WantedBy=graphical.target

The screenpad-sleeper.service:

[Unit]
Description=Run helper on wake from sleep; restores screenpad state prior to sleep.
Before=systemd-suspend.service
StopWhenUnneeded=yes

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/local/bin/screenpad_wake_helper.sh pre
ExecStop=/usr/local/bin/screenpad_wake_helper.sh post