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-rw-r--r--src/VBox/Additions/x11/vboxvideo/edid.c165
1 files changed, 165 insertions, 0 deletions
diff --git a/src/VBox/Additions/x11/vboxvideo/edid.c b/src/VBox/Additions/x11/vboxvideo/edid.c
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+/* $Id: edid.c $ */
+/** @file
+ *
+ * Linux Additions X11 graphics driver, EDID construction
+ */
+
+/*
+ * Copyright (C) 2006-2019 Oracle Corporation
+ * This file is based on drmmode_display.c from the X.Org xf86-video-intel
+ * driver with the following copyright notice:
+ *
+ * Copyright © 2007 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Authors:
+ * Dave Airlie <airlied@redhat.com>
+ * Michael Thayer <michael.thayer@oracle.com>
+ */
+
+#include "misc.h"
+#include "xf86DDC.h"
+#include "xf86Crtc.h"
+#include "vboxvideo.h"
+
+enum { EDID_SIZE = 128 };
+
+const unsigned char g_acszEDIDBase[EDID_SIZE] =
+{
+ 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, /* header */
+ 0x58, 0x58, /* manufacturer (VBX) */
+ 0x00, 0x00, /* product code */
+ 0x00, 0x00,0x00, 0x00, /* serial number goes here */
+ 0x01, /* week of manufacture */
+ 0x00, /* year of manufacture */
+ 0x01, 0x03, /* EDID version */
+ 0x80, /* capabilities - digital */
+ 0x00, /* horiz. res in cm, zero for projectors */
+ 0x00, /* vert. res in cm */
+ 0x78, /* display gamma (120 == 2.2). Should we ask the host for this? */
+ 0xEE, /* features (standby, suspend, off, RGB, standard colour space,
+ * preferred timing mode) */
+ 0xEE, 0x91, 0xA3, 0x54, 0x4C, 0x99, 0x26, 0x0F, 0x50, 0x54,
+ /* chromaticity for standard colour space - should we ask the host? */
+ 0x00, 0x00, 0x00, /* no default timings */
+ 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+ 0x01, 0x01, 0x01, 0x01, /* no standard timings */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* descriptor block 1 goes here */
+ 0x00, 0x00, 0x00, 0xFD, 0x00, /* descriptor block 2, monitor ranges */
+ 0x00, 0xC8, 0x00, 0xC8, 0x64, 0x00, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20,
+ 0x20, /* 0-200Hz vertical, 0-200KHz horizontal, 1000MHz pixel clock */
+ 0x00, 0x00, 0x00, 0xFC, 0x00, /* descriptor block 3, monitor name */
+ 'V', 'B', 'O', 'X', ' ', 'm', 'o', 'n', 'i', 't', 'o', 'r', '\n',
+ 0x00, 0x00, 0x00, 0x10, 0x00, /* descriptor block 4: dummy data */
+ 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
+ 0x20,
+ 0x00, /* number of extensions */
+ 0x00 /* checksum goes here */
+};
+
+static void fillDescBlockTimings(unsigned char *pchDescBlock,
+ DisplayModePtr mode)
+{
+ struct detailed_timings timing;
+
+ timing.clock = mode->Clock * 1000;
+ timing.h_active = mode->HDisplay;
+ timing.h_blanking = mode->HTotal - mode->HDisplay;
+ timing.v_active = mode->VDisplay;
+ timing.v_blanking = mode->VTotal - mode->VDisplay;
+ timing.h_sync_off = mode->HSyncStart - mode->HDisplay;
+ timing.h_sync_width = mode->HSyncEnd - mode->HSyncStart;
+ timing.v_sync_off = mode->VSyncStart - mode->VDisplay;
+ timing.v_sync_width = mode->VSyncEnd - mode->VSyncStart;
+ pchDescBlock[0] = (timing.clock / 10000) & 0xff;
+ pchDescBlock[1] = (timing.clock / 10000) >> 8;
+ pchDescBlock[2] = timing.h_active & 0xff;
+ pchDescBlock[3] = timing.h_blanking & 0xff;
+ pchDescBlock[4] = (timing.h_active >> 4) & 0xf0;
+ pchDescBlock[4] |= (timing.h_blanking >> 8) & 0xf;
+ pchDescBlock[5] = timing.v_active & 0xff;
+ pchDescBlock[6] = timing.v_blanking & 0xff;
+ pchDescBlock[7] = (timing.v_active >> 4) & 0xf0;
+ pchDescBlock[7] |= (timing.v_blanking >> 8) & 0xf;
+ pchDescBlock[8] = timing.h_sync_off & 0xff;
+ pchDescBlock[9] = timing.h_sync_width & 0xff;
+ pchDescBlock[10] = (timing.v_sync_off << 4) & 0xf0;
+ pchDescBlock[10] |= timing.v_sync_width & 0xf;
+ pchDescBlock[11] = (timing.h_sync_off >> 2) & 0xC0;
+ pchDescBlock[11] |= (timing.h_sync_width >> 4) & 0x30;
+ pchDescBlock[11] |= (timing.v_sync_off >> 2) & 0xC;
+ pchDescBlock[11] |= (timing.v_sync_width >> 4) & 0x3;
+ pchDescBlock[12] = pchDescBlock[13] = pchDescBlock[14]
+ = pchDescBlock[15] = pchDescBlock[16]
+ = pchDescBlock[17] = 0;
+}
+
+
+static void setEDIDChecksum(unsigned char *pch)
+{
+ unsigned i, sum = 0;
+ for (i = 0; i < EDID_SIZE - 1; ++i)
+ sum += pch[i];
+ pch[EDID_SIZE - 1] = (0x100 - (sum & 0xFF)) & 0xFF;
+}
+
+
+/**
+ * Construct an EDID for an output given a preferred mode. The main reason for
+ * doing this is to confound gnome-settings-deamon which tries to reset the
+ * last mode configuration if the same monitors are plugged in again, which is
+ * a reasonable thing to do but not what we want in a VM. We evily store
+ * the (empty) raw EDID data at the end of the structure so that it gets
+ * freed automatically along with the structure.
+ */
+Bool VBOXEDIDSet(xf86OutputPtr output, DisplayModePtr pmode)
+{
+ unsigned char *pch, *pchEDID;
+ xf86MonPtr pEDIDMon;
+
+ pch = calloc(1, sizeof(xf86Monitor) + EDID_SIZE);
+ if (!pch)
+ {
+ xf86DrvMsg(output->scrn->scrnIndex, X_ERROR,
+ "Can't allocate memory for EDID structure.\n");
+ return FALSE;
+ }
+ pchEDID = pch + sizeof(xf86Monitor);
+ memcpy(pchEDID, g_acszEDIDBase, EDID_SIZE);
+ pchEDID[12] = pmode->HDisplay & 0xff;
+ pchEDID[13] = pmode->HDisplay >> 8;
+ pchEDID[14] = pmode->VDisplay & 0xff;
+ pchEDID[15] = pmode->VDisplay >> 8;
+ fillDescBlockTimings(pchEDID + 54, pmode);
+ setEDIDChecksum(pchEDID);
+ pEDIDMon = xf86InterpretEDID(output->scrn->scrnIndex, pchEDID);
+ if (!pEDIDMon)
+ {
+ free(pch);
+ return FALSE;
+ }
+ memcpy(pch, pEDIDMon, sizeof(xf86Monitor));
+ free(pEDIDMon);
+ pEDIDMon = (xf86MonPtr)pch;
+ xf86OutputSetEDID(output, pEDIDMon);
+ return TRUE;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 12:17:50 +0000