xorg-server-1.4/hw/xfree86/ddc/ddcProperty.c

   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 #include "xf86_ansic.h"
  35
  36 #define EDID1_ATOM_NAME         "XFree86_DDC_EDID1_RAWDATA"
  37 #define EDID2_ATOM_NAME         "XFree86_DDC_EDID2_RAWDATA"
  38
  39 static void
  40 addRootWindowProperties(ScrnInfoPtr pScrn, xf86MonPtr DDC)
  41 {
  42     Atom EDID1Atom=-1, EDID2Atom=-1;
  43     CARD8 *EDID1rawdata = NULL;
  44     CARD8 *EDID2rawdata = NULL;
  45     int i, scrnIndex = pScrn->scrnIndex;
  46     Bool makeEDID1prop = FALSE;
  47     Bool makeEDID2prop = FALSE;
  48
  49     if (DDC->ver.version == 1) {
  50         makeEDID1prop = TRUE;
  51     } else if (DDC->ver.version == 2) {
  52         int checksum1;
  53         int checksum2;
  54         makeEDID2prop = TRUE;
  55
  56         /* Some monitors (eg Panasonic PanaSync4)
  57          * report version==2 because they used EDID v2 spec document,
  58          * although they use EDID v1 data structure :-(
  59          *
  60          * Try using checksum to determine when we have such a monitor.
  61          */
  62         checksum2 = 0;
  63         for (i = 0; i < 256; i++)
  64             checksum2 += DDC->rawData[i];
  65         if (checksum2 % 256) {
  66             xf86DrvMsg(scrnIndex, X_INFO, "Monitor EDID v2 checksum failed\n");
  67             xf86DrvMsg(scrnIndex, X_INFO,
  68                     "XFree86_DDC_EDID2_RAWDATA property may be bad\n");
  69             checksum1 = 0;
  70             for (i = 0; i < 128; i++)
  71                 checksum1 += DDC->rawData[i];
  72             if (!(checksum1 % 256)) {
  73                 xf86DrvMsg(scrnIndex, X_INFO,
  74                         "Monitor EDID v1 checksum passed,\n");
  75                 xf86DrvMsg(scrnIndex, X_INFO,
  76                         "XFree86_DDC_EDID1_RAWDATA property created\n");
  77                 makeEDID1prop = TRUE;
  78             }
  79         }
  80     } else {
  81         xf86DrvMsg(scrnIndex, X_PROBED, "unexpected EDID version %d.%d\n",
  82                 DDC->ver.version, DDC->ver.revision);
  83         return;
  84     }
  85
  86     if (makeEDID1prop) {
  87         if ((EDID1rawdata = xalloc(128*sizeof(CARD8)))==NULL)
  88             return;
  89
  90         EDID1Atom = MakeAtom(EDID1_ATOM_NAME, sizeof(EDID1_ATOM_NAME) - 1, TRUE);
  91         memcpy(EDID1rawdata, DDC->rawData, 128);
  92         xf86RegisterRootWindowProperty(scrnIndex, EDID1Atom, XA_INTEGER, 8,
  93                 128, (unsigned char *)EDID1rawdata);
  94     }
  95
  96     if (makeEDID2prop) {
  97         if ((EDID2rawdata = xalloc(256*sizeof(CARD8)))==NULL)
  98             return;
  99
 100         memcpy(EDID2rawdata, DDC->rawData, 256);
 101         EDID2Atom = MakeAtom(EDID2_ATOM_NAME, sizeof(EDID2_ATOM_NAME) - 1, TRUE);
 102         xf86RegisterRootWindowProperty(scrnIndex, EDID2Atom, XA_INTEGER, 8,
 103                 256, (unsigned char *)EDID2rawdata);
 104     }
 105 }
 106
 107 Bool
 108 xf86SetDDCproperties(ScrnInfoPtr pScrn, xf86MonPtr DDC)
 109 {
 110     if (!pScrn || !pScrn->monitor || !DDC)
 111         return FALSE;
 112
 113     xf86DDCMonitorSet(pScrn->scrnIndex, pScrn->monitor, DDC);
 114
 115     addRootWindowProperties(pScrn, DDC);
 116
 117     return TRUE;
 118 }