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60 lines
2.2 KiB
C
60 lines
2.2 KiB
C
/* $NetBSD: wsdisplay_util.c,v 1.1 2011/06/29 03:09:37 macallan Exp $ */
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/*-
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* Copyright (c) 2009 Michael Lorenz
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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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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/* some utility functions for use with wsdisplay */
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#include <sys/param.h>
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#include <sys/stdint.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/device.h>
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#include <dev/cons.h>
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#include <dev/wscons/wsdisplayvar.h>
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#include <dev/wscons/wsconsio.h>
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int
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wsdisplayio_get_edid(device_t dev, struct wsdisplayio_edid_info *d)
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{
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prop_data_t edid_data;
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int edid_size;
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edid_data = prop_dictionary_get(device_properties(dev), "EDID");
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if (edid_data != NULL) {
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edid_size = prop_data_size(edid_data);
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/* less than 128 bytes is bogus */
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if (edid_size < 128)
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return ENODEV;
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d->data_size = edid_size;
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if (d->buffer_size < edid_size)
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return EAGAIN;
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return copyout(prop_data_data_nocopy(edid_data),
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d->edid_data, edid_size);
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}
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return ENODEV;
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}
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