/*
* sisusb - usb kernel driver for SiS315(E) based USB2VGA dongles
*
* VGA text mode console part
*
* Copyright (C) 2005 by Thomas Winischhofer, Vienna, Austria
*
* If distributed as part of the Linux kernel, this code is licensed under the
* terms of the GPL v2.
*
* Otherwise, the following license terms apply:
*
* * Redistribution and use in source and binary forms, with or without
* * modification, are permitted provided that the following conditions
* * are met:
* * 1) Redistributions of source code must retain the above copyright
* * notice, this list of conditions and the following disclaimer.
* * 2) Redistributions in binary form must reproduce the above copyright
* * notice, this list of conditions and the following disclaimer in the
* * documentation and/or other materials provided with the distribution.
* * 3) The name of the author may not be used to endorse or promote products
* * derived from this software without specific psisusbr written permission.
* *
* * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESSED OR
* * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Author: Thomas Winischhofer <thomas@winischhofer.net>
*
* Portions based on vgacon.c which are
* Created 28 Sep 1997 by Geert Uytterhoeven
* Rewritten by Martin Mares <mj@ucw.cz>, July 1998
* based on code Copyright (C) 1991, 1992 Linus Torvalds
* 1995 Jay Estabrook
*
* A note on using in_atomic() in here: We can't handle console
* calls from non-schedulable context due to our USB-dependend
* nature. For now, this driver just ignores any calls if it
* detects this state.
*
*/
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/fs.h>
#include <