tty: USB serial termios bits

Various drivers have hacks to mangle termios structures. This stems from
the fact there is no nice setup hook for configuring the termios settings
when the port is created

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

include/linux/usb/serial.h

@@ -260,6 +260,9 @@ struct usb_serial_driver {
 	   be an attached tty at this point */
 	void (*dtr_rts)(struct usb_serial_port *port, int on);
 	int  (*carrier_raised)(struct usb_serial_port *port);
+	/* Called by the usb serial hooks to allow the user to rework the
+	   termios state */
+	void (*init_termios)(struct tty_struct *tty);
 	/* USB events */
 	void (*read_int_callback)(struct urb *urb);
 	void (*write_int_callback)(struct urb *urb);