1 /* $NetBSD: wsdisplay_util.c,v 1.1 2011/06/29 03:09:37 macallan Exp $ */ 2 3 /*- 4 * Copyright (c) 2009 Michael Lorenz 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* some utility functions for use with wsdisplay */ 30 #include <sys/param.h> 31 #include <sys/stdint.h> 32 #include <sys/systm.h> 33 #include <sys/buf.h> 34 #include <sys/device.h> 35 #include <dev/cons.h> 36 37 #include <dev/wscons/wsdisplayvar.h> 38 #include <dev/wscons/wsconsio.h> 39 40 int 41 wsdisplayio_get_edid(device_t dev, struct wsdisplayio_edid_info *d) 42 { 43 prop_data_t edid_data; 44 int edid_size; 45 46 edid_data = prop_dictionary_get(device_properties(dev), "EDID"); 47 if (edid_data != NULL) { 48 edid_size = prop_data_size(edid_data); 49 /* less than 128 bytes is bogus */ 50 if (edid_size < 128) 51 return ENODEV; 52 d->data_size = edid_size; 53 if (d->buffer_size < edid_size) 54 return EAGAIN; 55 return copyout(prop_data_data_nocopy(edid_data), 56 d->edid_data, edid_size); 57 } 58 return ENODEV; 59 } 60