#!/bin/bash
set -euo pipefail

# Reset USB controller and re-bind gadget
UDC="4e00000.usb"
GADGET="/sys/kernel/config/usb_gadget/g1"

# Find the driver binding
DRIVER=""
for d in /sys/bus/platform/drivers/*/; do
    dname=$(basename "$d")
    if [ -L "$d/$UDC" ] 2>/dev/null; then
        DRIVER="$dname"
        break
    fi
done

if [ -z "$DRIVER" ]; then
    # Try looking at the UDC device itself
    UDC_PATH=$(readlink -f /sys/class/udc/$UDC/device 2>/dev/null || echo "")
    if [ -n "$UDC_PATH" ]; then
        DRIVER=$(basename "$(dirname "$UDC_PATH")" 2>/dev/null || echo "")
    fi
fi

echo "Driver: ${DRIVER:-unknown}"

# Unbind
if [ -n "$DRIVER" ]; then
    echo "$UDC" > "/sys/bus/platform/drivers/$DRIVER/unbind" 2>/dev/null && echo "Unbound" || echo "Unbind failed"
    sleep 2
    echo "$UDC" > "/sys/bus/platform/drivers/$DRIVER/bind" 2>/dev/null && echo "Rebound" || echo "Rebind failed"
    sleep 1
fi

# Bind gadget
echo "$UDC" > "$GADGET/UDC" 2>&1 && echo "Gadget bound" || echo "Gadget bind failed"
cat /sys/class/udc/$UDC/state