#!/bin/bash

# Define paths and addresses
GADGET_DIR="/sys/kernel/config/usb_gadget/g1"
HOST="00:dc:c8:f7:75:15"
SELF="00:dd:dc:eb:6d:a1"


  # Create USB gadget
  mkdir -p $GADGET_DIR
  cd $GADGET_DIR

  # Set basic device properties
  echo 0x1d6b > idVendor  # Linux Foundation
  echo 0x0104 > idProduct # Multifunction Composite Gadget
  echo 0x0100 > bcdDevice # v1.1.0
  echo 0x0200 > bcdUSB    # USB 2.0

  # Add English strings
  mkdir -p strings/0x409
  echo "0001" > strings/0x409/serialnumber
  echo "WulfData" > strings/0x409/manufacturer
  echo "Speakers and Audio System" > strings/0x409/product

  # Create configuration
  mkdir -p configs/c.1
  mkdir -p configs/c.1/strings/0x409
  echo "Config 1" > configs/c.1/strings/0x409/configuration
  echo 500 > configs/c.1/MaxPower

  mkdir functions/ncm.usb0
  # echo $HOST > functions/ecm.usb0/host_addr
  # echo $SELF > functions/ecm.usb0/dev_addr
  ln -s functions/ncm.usb0 configs/c.1/

  # Add Audio Function (UAC2)
  mkdir -p functions/uac2.usb0
  echo 48000 > functions/uac2.usb0/c_srate
  echo 48000 > functions/uac2.usb0/p_srate
  # echo 51 > functions/uac2.usb0/c_chmask # "110011".to_i(2)
  echo 3 > functions/uac2.usb0/c_chmask
  echo 1 > functions/uac2.usb0/p_chmask

  echo 4 > functions/uac2.usb0/c_ssize
  echo 2 > functions/uac2.usb0/p_ssize
  ln -s functions/uac2.usb0 configs/c.1/

  # Enable the gadget
  UDC=$(ls /sys/class/udc | head -n 1)
  echo $UDC > UDC
  # ip link set usb0 up
  sleep 1
  # systemctl start isc-dhcp-server
  systemctl start dnsmasq