#!/bin/bash
# Disable the ROG Falchion *System Control* interface in libinput (Wayland-safe)
# Ref: https://wayland.freedesktop.org/libinput/doc/latest/ignoring-devices.html

set -euo pipefail
(( EUID == 0 )) || { echo "Run as root (sudo)"; exit 1; }

# Defaults for the Falchion 2.4G dongle; override via env if needed.
VID="${VID:-0B05}"
PID="${PID:-193E}"
IFACE="${IFACE:-02}"   # bInterfaceNumber for System Control

rule=/etc/udev/rules.d/99-ignore-rog-falchion-system-control.rules

cat >"$rule" <<EOF
# Ignore ASUS ROG Falchion System Control (prevents KEY_POWER/SLEEP/WAKEUP reaching the compositor)
# USB HID event nodes only; target vendor/product and interface 02
ACTION!="remove", KERNEL=="event[0-9]*", SUBSYSTEM=="input", \
  ENV{ID_VENDOR_ID}=="${VID}", ENV{ID_MODEL_ID}=="${PID}", \
  ATTRS{bInterfaceNumber}=="${IFACE}", \
  ENV{LIBINPUT_IGNORE_DEVICE}="1"
EOF
echo "Wrote $rule"

# Reload rules and re-evaluate only matching devices
udevadm control --reload
udevadm trigger --subsystem-match=input --action=change

# Try to find the current event node(s) for System Control
echo "Probing matching devices:"
for dev in /dev/input/event*; do
  [[ -e "$dev" ]] || continue
  if udevadm info -q property -n "$dev" | grep -Eq \
     "ID_VENDOR_ID=$VID|ID_VENDOR_ID=${VID,,}"; then
    props="$(udevadm info -q property -n "$dev")"
    if grep -qE "^ID_MODEL_ID=(${PID}|${PID,,})" <<<"$props" \
       && grep -q "^ID_BUS=usb" <<<"$props" \
       && udevadm info -a -n "$dev" | grep -q "bInterfaceNumber\)==\"${IFACE}\""; then
      echo " - $dev"
      echo "$props" | grep -E 'LIBINPUT_IGNORE_DEVICE|ID_INPUT|ID_MODEL|ID_VENDOR' || true
    fi
  fi
done

echo
echo "If LIBINPUT_IGNORE_DEVICE isn't shown for the System Control node yet:"
echo " - Unplug/replug the dongle or power-cycle the keyboard."
echo " - Then run: libinput list-devices | grep -A2 -i 'falchion'"

echo "To revert: rm $rule && udevadm control --reload && udevadm trigger -s input"