cp210x_interface_num
if (cp210x_interface_num(port->serial) == 1)
u8 intf_num = cp210x_interface_num(serial);
if (cp210x_interface_num(serial) != 0)
port_priv->bInterfaceNumber = cp210x_interface_num(serial);
if (cp210x_interface_num(serial) == 0) {
type, val, cp210x_interface_num(serial), buf, bufsize,
type, val, cp210x_interface_num(serial), buf, bufsize,