#!/bin/sh
# Fix ASUS 5M webcam after suspend/resume.
# The webcam USB device fails to resume (error -22) and disconnects.
# Rebinding the xHCI controller forces re-enumeration.

set -e

CONTROLLER="/sys/bus/pci/drivers/xhci_hcd/0000:c4:00.4"

if [ ! -e "$CONTROLLER" ]; then
    echo "fix-webcam-resume: xHCI controller not found at $CONTROLLER" >&2
    exit 1
fi

echo "fix-webcam-resume: rebinding xHCI controller..."
echo "0000:c4:00.4" > /sys/bus/pci/drivers/xhci_hcd/unbind
sleep 1
echo "0000:c4:00.4" > /sys/bus/pci/drivers/xhci_hcd/bind

# Wait for USB devices to settle
sleep 2

if [ -e /dev/video0 ]; then
    echo "fix-webcam-resume: webcam is back at /dev/video0"
else
    echo "fix-webcam-resume: /dev/video0 still missing after rebind" >&2
fi