kbdmux(4) keyboard multiplexer integration

o Add minimal kbdmux(4) man page to the source tree (more details to follow);

o Hook up kbdmux(4) to the build.

This concludes the first part of the kbdmux(4) keyboard multiplexer
integration. It now should be possible to use kbdmux(4), however one
must configure kbdmux(4) by hand (i.e. load kbdmux(4) module and use
kbdcontrol(1) to add/remove slave keyboards to/from kbdmux(4)).

MFC after:	1 week

share/man/man4/Makefile

@@ -122,6 +122,7 @@ MAN=	aac.4 \
 	ixgb.4 \
 	joy.4 \
 	kame.4 \
+	kbdmux.4 \
 	keyboard.4 \
 	kld.4 \
 	ktr.4 \

share/man/man4/kbdmux.4

@@ -0,0 +1,51 @@
+.\" $Id: kbdmux.4,v 1.1 2005/07/14 20:32:10 max Exp $
+.\" $FreeBSD$
+.\"
+.Dd July 12, 2005
+.Os
+.Dt kbdmux 4
+.Sh NAME
+.Nm kbdmux
+.Nd keyboard multiplexer
+.Sh SYNOPSIS
+.Cd device kbdmux
+.Sh DESCRIPTION
+The
+.Nm
+keyboard driver provides support for basic keyboard multiplexer.
+It is built around the idea of
+.Dq super keyboard ,
+that is
+.Nm
+is a keyboard that consumes input from all slave keyboards attached to it.
+.Pp
+Slave keyboards can be attached to or detached from the
+.Nm
+keyboard driver with
+.Xr kbdcontrol 1
+utility.
+.Sh SEE ALSO
+.Xr kbdcontrol 1 ,
+.Xr atkbd 4 ,
+.Xr pcvt 4 ,
+.Xr syscons 4 ,
+.Xr ukbd 4
+.Sh CAVEAT
+The
+.Nm
+keyboard driver switches all slave keyboards into
+.Dv K_RAW
+mode.
+Thus all slave keyboards attached to the
+.Nm
+keyboard share the same state.
+The
+.Nm
+keyboard is logically equivalent to one keyboard with lots of duplicated keys.
+.Sh HISTORY
+The
+.Nm
+module was implemented in
+.Fx 6.0 .
+.Sh AUTHORS
+.An Maksim Yevmenkin Aq m_evmenkin@yahoo.com

sys/conf/files

@@ -627,6 +627,7 @@ dev/ixgb/ixgb_hw.c		optional ixgb
 dev/joy/joy.c			optional joy
 dev/joy/joy_isa.c		optional joy isa
 dev/joy/joy_pccard.c		optional joy pccard
+dev/kbdmux/kbdmux.c		optional kbdmux
 dev/led/led.c			standard
 dev/lge/if_lge.c		optional lge
 dev/lnc/if_lnc.c		optional lnc

sys/modules/Makefile

@@ -124,6 +124,7 @@ SUBDIR=	${_3dfx} \
 	ispfw \
 	iwi \
 	joy \
+	kbdmux \
 	kue \
 	lge \
 	libalias \