ddcProperty.c revision 4642e01f 
1/*
2 * Copyright 2006 Luc Verhaegen.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sub license,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the
12 * next paragraph) shall be included in all copies or substantial portions
13 * of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24#ifdef HAVE_XORG_CONFIG_H
25#include <xorg-config.h>
26#endif
27
28#include "xf86.h"
29#include "xf86DDC.h"
30#include <X11/Xatom.h>
31#include "property.h"
32#include "propertyst.h"
33#include "xf86DDC.h"
34
35#define EDID1_ATOM_NAME         "XFree86_DDC_EDID1_RAWDATA"
36#define EDID2_ATOM_NAME         "XFree86_DDC_EDID2_RAWDATA"
37
38static void
39addRootWindowProperties(ScrnInfoPtr pScrn, xf86MonPtr DDC)
40{
41    Atom EDID1Atom=-1, EDID2Atom=-1;
42    CARD8 *EDID1rawdata = NULL;
43    CARD8 *EDID2rawdata = NULL;
44    int i, scrnIndex = pScrn->scrnIndex;
45    Bool makeEDID1prop = FALSE;
46    Bool makeEDID2prop = FALSE;
47
48    if (DDC->ver.version == 1) {
49	makeEDID1prop = TRUE;
50    } else if (DDC->ver.version == 2) {
51	int checksum1;
52	int checksum2;
53	makeEDID2prop = TRUE;
54
55	/* Some monitors (eg Panasonic PanaSync4)
56	 * report version==2 because they used EDID v2 spec document,
57	 * although they use EDID v1 data structure :-(
58	 *
59	 * Try using checksum to determine when we have such a monitor.
60	 */
61	checksum2 = 0;
62	for (i = 0; i < 256; i++)
63	    checksum2 += DDC->rawData[i];
64	if (checksum2 % 256) {
65	    xf86DrvMsg(scrnIndex, X_INFO, "Monitor EDID v2 checksum failed\n");
66	    xf86DrvMsg(scrnIndex, X_INFO,
67		    "XFree86_DDC_EDID2_RAWDATA property may be bad\n");
68	    checksum1 = 0;
69	    for (i = 0; i < 128; i++)
70		checksum1 += DDC->rawData[i];
71	    if (!(checksum1 % 256)) {
72		xf86DrvMsg(scrnIndex, X_INFO,
73			"Monitor EDID v1 checksum passed,\n");
74		xf86DrvMsg(scrnIndex, X_INFO,
75			"XFree86_DDC_EDID1_RAWDATA property created\n");
76		makeEDID1prop = TRUE;
77	    }
78	}
79    } else {
80	xf86DrvMsg(scrnIndex, X_PROBED, "unexpected EDID version %d.%d\n",
81		DDC->ver.version, DDC->ver.revision);
82	return;
83    }
84
85    if (makeEDID1prop) {
86	int size = 128;
87
88	if (DDC->flags & EDID_COMPLETE_RAWDATA)
89	    size += DDC->no_sections * 128;
90
91	if ((EDID1rawdata = xalloc(size*sizeof(CARD8)))==NULL)
92	    return;
93
94	EDID1Atom = MakeAtom(EDID1_ATOM_NAME, sizeof(EDID1_ATOM_NAME) - 1, TRUE);
95	memcpy(EDID1rawdata, DDC->rawData, size);
96	xf86RegisterRootWindowProperty(scrnIndex, EDID1Atom, XA_INTEGER, 8,
97		size, (unsigned char *)EDID1rawdata);
98    }
99
100    if (makeEDID2prop) {
101	if ((EDID2rawdata = xalloc(256*sizeof(CARD8)))==NULL)
102	    return;
103
104	memcpy(EDID2rawdata, DDC->rawData, 256);
105	EDID2Atom = MakeAtom(EDID2_ATOM_NAME, sizeof(EDID2_ATOM_NAME) - 1, TRUE);
106	xf86RegisterRootWindowProperty(scrnIndex, EDID2Atom, XA_INTEGER, 8,
107		256, (unsigned char *)EDID2rawdata);
108    }
109}
110
111Bool
112xf86SetDDCproperties(ScrnInfoPtr pScrn, xf86MonPtr DDC)
113{
114    if (!pScrn || !pScrn->monitor || !DDC)
115        return FALSE;
116
117    xf86DDCMonitorSet(pScrn->scrnIndex, pScrn->monitor, DDC);
118
119    addRootWindowProperties(pScrn, DDC);
120
121    return TRUE;
122}
123