static int whiteheat_write_room (struct usb_serial_port *port);
static int whiteheat_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
static void whiteheat_set_termios (struct usb_serial_port *port, struct termios * old);
static int whiteheat_write_room (struct usb_serial_port *port);
static int whiteheat_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
static void whiteheat_set_termios (struct usb_serial_port *port, struct termios * old);