1.\" $NetBSD: ddc.4,v 1.4 2014/01/04 15:40:25 wiz Exp $ 2.\" 3.\" Copyright (c) 2006 Itronix Inc. 4.\" All rights reserved. 5.\" 6.\" Written by Garrett D'Amore for Itronix Inc. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. The name of Itronix Inc. may not be used to endorse 17.\" or promote products derived from this software without specific 18.\" prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND ANY EXPRESS 21.\" OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 22.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. 24.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30.\" POSSIBILITY OF SUCH DAMAGE. 31.\" 32.Dd May 11, 2006 33.Dt DDC 4 34.Os 35.Sh NAME 36.Nm ddc 37.Nd VESA Display Data Channel V2 devices 38.Sh SYNOPSIS 39.Cd "ddc at iic? addr 0x50" 40.Sh DESCRIPTION 41The 42.Nm 43driver provides support for accessing the VESA Display Data Channel Version 2 44supported by many video displays. 45.Sh SEE ALSO 46.Xr iic 4 , 47.Xr ddc 9 , 48.Xr edid 9 49.Sh HISTORY 50The 51.Nm 52device appeared in 53.Nx 4.0 . 54.Sh AUTHORS 55.An Garrett D'Amore Aq Mt gdamore@NetBSD.org 56.Sh BUGS 57This driver does not provide any mechanism for access from user applications. 58Its only use at this point is to provide a means for framebuffer device 59drivers to query monitor description data (EDID) using a specialized 60in-kernel API. 61No support for sending control commands to display devices is provided. 62