From 0bc28762a382dbc51fbdc5218ec0401fa9e04b5c Mon Sep 17 00:00:00 2001
From: mlelstv <mlelstv@NetBSD.org>
Date: Tue, 21 Jan 2014 00:08:27 +0000
Subject: [PATCH] add function to detach wscons from a console. This allows to
 switch the console to a different driver.

---
 sys/dev/wscons/wsdisplay.c    | 13 +++++++++++--
 sys/dev/wscons/wsdisplayvar.h |  3 ++-
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/sys/dev/wscons/wsdisplay.c b/sys/dev/wscons/wsdisplay.c
index cf39a53620a9..baa8457d6433 100644
--- a/sys/dev/wscons/wsdisplay.c
+++ b/sys/dev/wscons/wsdisplay.c
@@ -1,4 +1,4 @@
-/* $NetBSD: wsdisplay.c,v 1.135 2012/02/02 13:11:25 drochner Exp $ */
+/* $NetBSD: wsdisplay.c,v 1.136 2014/01/21 00:08:27 mlelstv Exp $ */
 
 /*
  * Copyright (c) 1996, 1997 Christopher G. Demetriou.  All rights reserved.
@@ -31,7 +31,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: wsdisplay.c,v 1.135 2012/02/02 13:11:25 drochner Exp $");
+__KERNEL_RCSID(0, "$NetBSD: wsdisplay.c,v 1.136 2014/01/21 00:08:27 mlelstv Exp $");
 
 #include "opt_wsdisplay_compat.h"
 #include "opt_wsmsgattrs.h"
@@ -884,6 +884,15 @@ wsdisplay_preattach(const struct wsscreen_descr *type, void *cookie,
 	wsdisplay_console_initted = 1;
 }
 
+void
+wsdisplay_cndetach(void)
+{
+	KASSERT(wsdisplay_console_initted == 2);
+
+	cn_tab = NULL;
+	wsdisplay_console_initted = 0;
+}
+
 /*
  * Tty and cdevsw functions.
  */
diff --git a/sys/dev/wscons/wsdisplayvar.h b/sys/dev/wscons/wsdisplayvar.h
index 963d1637e926..a01083ae5f85 100644
--- a/sys/dev/wscons/wsdisplayvar.h
+++ b/sys/dev/wscons/wsdisplayvar.h
@@ -1,4 +1,4 @@
-/* $NetBSD: wsdisplayvar.h,v 1.50 2013/01/31 10:57:30 macallan Exp $ */
+/* $NetBSD: wsdisplayvar.h,v 1.51 2014/01/21 00:08:27 mlelstv Exp $ */
 
 /*
  * Copyright (c) 1996, 1997 Christopher G. Demetriou.  All rights reserved.
@@ -163,6 +163,7 @@ void	wsdisplay_cnattach(const struct wsscreen_descr *, void *, int, int,
             long);
 void	wsdisplay_preattach(const struct wsscreen_descr *, void *, int, int,
             long);
+void	wsdisplay_cndetach(void);
 
 int	wsdisplaydevprint(void *, const char *);
 int	wsemuldisplaydevprint(void *, const char *);