static int whiteheat_tiocmget (struct usb_serial_port *port, struct file *file);
static int whiteheat_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
static void whiteheat_break_ctl (struct usb_serial_port *port, int break_state);
static int whiteheat_chars_in_buffer (struct usb_serial_port *port);
static void whiteheat_throttle (struct usb_serial_port *port);
static void whiteheat_unthrottle (struct usb_serial_port *port);
static int whiteheat_tiocmget (struct usb_serial_port *port, struct file *file);
static int whiteheat_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
static void whiteheat_break_ctl (struct usb_serial_port *port, int break_state);
static int whiteheat_chars_in_buffer (struct usb_serial_port *port);
static void whiteheat_throttle (struct usb_serial_port *port);
static void whiteheat_unthrottle (struct usb_serial_port *port);