#!/bin/sh
# Set up the ASUS 5M webcam suspend/resume fix.
# Installs a udev rule and a systemd service that rebinds the xHCI
# controller on resume so the webcam comes back.

set -e

UDEV_RULE="/etc/udev/rules.d/99-webcam-usb.rules"
SYSTEMD_UNIT="/etc/systemd/system/fix-webcam-resume.service"
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
REBIND_SCRIPT="$SCRIPT_DIR/fix-webcam-resume"
RULE_SOURCE="$SCRIPT_DIR/99-webcam-usb.rules"

already_setup() {
    [ -f "$UDEV_RULE" ] && [ -f "$SYSTEMD_UNIT" ] && systemctl is-enabled fix-webcam-resume.service >/dev/null 2>&1
}

if already_setup; then
    echo "Webcam resume fix already set up. Nothing to do."
    exit 0
fi

if [ "$(id -u)" -ne 0 ]; then
    echo "install-webcam-fix: root required, re-running with sudo..." >&2
    exec sudo "$0" "$@"
fi

# Install udev rule
cp "$RULE_SOURCE" "$UDEV_RULE"
udevadm control --reload-rules
udevadm trigger
echo "install-webcam-fix: udev rule installed"

# Install systemd resume service
cat > "$SYSTEMD_UNIT" << EOF
[Unit]
Description=Fix ASUS webcam after suspend/resume
After=suspend.target hibernate.target hybrid-sleep.target

[Service]
Type=oneshot
ExecStart=$REBIND_SCRIPT

[Install]
WantedBy=suspend.target hibernate.target hybrid-sleep.target
EOF

systemctl daemon-reload
systemctl enable fix-webcam-resume.service
echo "install-webcam-fix: systemd service installed and enabled"

echo "install-webcam-fix: done"