62 lines
2.3 KiB
Groff
62 lines
2.3 KiB
Groff
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.\" $NetBSD: ddc.4,v 1.1 2006/05/11 21:00:19 gdamore Exp $
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.\"
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.\" Copyright (c) 2006 Itronix Inc.
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.\" All rights reserved.
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.\"
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.\" Written by Garrett D'Amore for Itronix Inc.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of Itronix Inc. may not be used to endorse
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.\" or promote products derived from this software without specific
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.\" prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND ANY EXPRESS
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.\" OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC.
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 11, 2006
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.Dt DDC 4
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.Os
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.Sh NAME
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.Nm ddc
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.Nd VESA Display Data Channel V2 devices
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.Sh SYNOPSIS
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.Cd "ddc at iic? addr 0x50"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for accessing the VESA Display Data Channel Version 2
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supported by many video displays.
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.Sh BUGS
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This driver does not provide any mechanism for access from user applications.
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Its only use at this point is to provide a means for framebuffer device
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drivers to query monitor description data (EDID) using a specialized
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in-kernel API. No support for sending control commands to display devices
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is provided.
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.Sh SEE ALSO
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.Xr iic 4 ,
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.Xr ddc 9 ,
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.Xr edid 9
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.Sh HISTORY
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The
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.Nm
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device appeared in
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.Nx 4.0 .
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.Sh AUTHORS
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.An Garrett D'Amore Aq gdamore@NetBSD.org
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