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-rw-r--r--src/g80_ddc.c232
1 files changed, 232 insertions, 0 deletions
diff --git a/src/g80_ddc.c b/src/g80_ddc.c
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+/*
+ * Copyright (c) 2007 NVIDIA, Corporation
+ *
+ * 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 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.
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <strings.h>
+#include <xf86DDC.h>
+
+#include "g80_type.h"
+#include "g80_ddc.h"
+
+static Bool G80ReadPortMapping(int scrnIndex, G80Ptr pNv)
+{
+ unsigned char *table2;
+ unsigned char headerSize, entries;
+ int i;
+ CARD16 a;
+ CARD32 b;
+
+ /* Clear the i2c map to invalid */
+ for(i = 0; i < 4; i++)
+ pNv->i2cMap[i].dac = pNv->i2cMap[i].sor = -1;
+
+ if(*(CARD16*)pNv->table1 != 0xaa55) goto fail;
+
+ a = *(CARD16*)(pNv->table1 + 0x36);
+ table2 = (unsigned char*)pNv->table1 + a;
+
+ if(table2[0] != 0x40) goto fail;
+
+ b = *(CARD32*)(table2 + 6);
+ if(b != 0x4edcbdcb) goto fail;
+
+ headerSize = table2[1];
+ entries = table2[2];
+
+ for(i = 0; i < entries; i++) {
+ CARD32 type, port;
+ ORNum or;
+
+ b = *(CARD32*)&table2[headerSize + 8*i];
+ type = b & 0xf;
+ port = (b >> 4) & 0xf;
+ or = ffs((b >> 24) & 0xf) - 1;
+
+ if(type < 4 && port != 0xf) {
+ switch(type) {
+ case 0: /* CRT */
+ case 1: /* TV */
+ if(pNv->i2cMap[port].dac != -1) {
+ xf86DrvMsg(scrnIndex, X_WARNING,
+ "DDC routing table corrupt! DAC %i -> %i "
+ "for port %i\n",
+ or, pNv->i2cMap[port].dac, port);
+ }
+ pNv->i2cMap[port].dac = or;
+ break;
+ case 2: /* TMDS */
+ case 3: /* LVDS */
+ if(pNv->i2cMap[port].sor != -1)
+ xf86DrvMsg(scrnIndex, X_WARNING,
+ "DDC routing table corrupt! SOR %i -> %i "
+ "for port %i\n",
+ or, pNv->i2cMap[port].sor, port);
+ pNv->i2cMap[port].sor = or;
+ break;
+ }
+ }
+ }
+
+ xf86DrvMsg(scrnIndex, X_PROBED, "I2C map:\n");
+ for(i = 0; i < 4; i++) {
+ if(pNv->i2cMap[i].dac != -1)
+ xf86DrvMsg(scrnIndex, X_PROBED, " Bus %i -> DAC%i\n", i, pNv->i2cMap[i].dac);
+ if(pNv->i2cMap[i].sor != -1)
+ xf86DrvMsg(scrnIndex, X_PROBED, " Bus %i -> SOR%i\n", i, pNv->i2cMap[i].sor);
+ }
+
+ return TRUE;
+
+fail:
+ xf86DrvMsg(scrnIndex, X_ERROR, "Couldn't find the DDC routing table. "
+ "Mode setting will probably fail!\n");
+ return FALSE;
+}
+
+static void G80_I2CPutBits(I2CBusPtr b, int clock, int data)
+{
+ G80Ptr pNv = G80PTR(xf86Screens[b->scrnIndex]);
+ const int off = b->DriverPrivate.val;
+
+ pNv->reg[(0x0000E138+off)/4] = 4 | clock | data << 1;
+}
+
+static void G80_I2CGetBits(I2CBusPtr b, int *clock, int *data)
+{
+ G80Ptr pNv = G80PTR(xf86Screens[b->scrnIndex]);
+ const int off = b->DriverPrivate.val;
+ unsigned char val;
+
+ val = pNv->reg[(0x0000E138+off)/4];
+ *clock = !!(val & 1);
+ *data = !!(val & 2);
+}
+
+static xf86MonPtr G80ProbeDDCBus(ScrnInfoPtr pScrn, int bus)
+{
+ G80Ptr pNv = G80PTR(pScrn);
+ I2CBusPtr i2c;
+ xf86MonPtr monInfo = NULL;
+ const int off = bus * 0x18;
+
+ /* Allocate the I2C bus structure */
+ i2c = xf86CreateI2CBusRec();
+ if(!i2c) return NULL;
+
+ i2c->BusName = "DDC";
+ i2c->scrnIndex = pScrn->scrnIndex;
+ i2c->I2CPutBits = G80_I2CPutBits;
+ i2c->I2CGetBits = G80_I2CGetBits;
+ i2c->ByteTimeout = 2200; /* VESA DDC spec 3 p. 43 (+10 %) */
+ i2c->StartTimeout = 550;
+ i2c->BitTimeout = 40;
+ i2c->ByteTimeout = 40;
+ i2c->AcknTimeout = 40;
+ i2c->DriverPrivate.val = off;
+
+ if(!xf86I2CBusInit(i2c)) goto done;
+
+ pNv->reg[(0x0000E138+off)/4] = 7;
+ xf86DrvMsg(pScrn->scrnIndex, X_INFO,
+ "Probing for EDID on I2C bus %i...\n", bus);
+ monInfo = xf86DoEDID_DDC2(pScrn->scrnIndex, i2c);
+
+ pNv->reg[(0x0000E138+off)/4] = 3;
+
+ if(monInfo) {
+ xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
+ "DDC detected a %s:\n", monInfo->features.input_type ?
+ "DFP" : "CRT");
+ xf86PrintEDID(monInfo);
+ } else {
+ xf86DrvMsg(pScrn->scrnIndex, X_INFO, " ... none found\n");
+ }
+
+done:
+ xf86DestroyI2CBusRec(i2c, TRUE, TRUE);
+
+ return monInfo;
+}
+
+/*
+ * Try DDC on each bus until we find one that works.
+ */
+Bool G80ProbeDDC(ScrnInfoPtr pScrn)
+{
+ G80Ptr pNv = G80PTR(pScrn);
+ xf86MonPtr monInfo;
+ int port;
+ Bool flatPanel;
+
+ if(!G80ReadPortMapping(pScrn->scrnIndex, pNv))
+ return FALSE;
+
+ for(port = 0; port < 4; port++) {
+ if(pNv->i2cMap[port].dac == -1 && pNv->i2cMap[port].sor == -1)
+ /* No outputs on this port. Skip it. */
+ continue;
+
+ monInfo = G80ProbeDDCBus(pScrn, port);
+ if(!monInfo)
+ /* No EDID on this port. */
+ continue;
+
+ flatPanel = (monInfo->features.input_type == 1);
+
+ if(flatPanel) {
+ if(pNv->i2cMap[port].sor == -1) {
+ xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Saw a flat panel EDID "
+ "on I2C port %i but no SOR outputs were registered for "
+ "that port.\n", port);
+ continue;
+ }
+ pNv->orType = SOR;
+ pNv->or = pNv->i2cMap[port].sor;
+ } else {
+ if(pNv->i2cMap[port].dac == -1) {
+ xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Saw a flat panel EDID "
+ "on I2C port %i but no DAC outputs were registered for "
+ "that port.\n", port);
+ continue;
+ }
+ pNv->orType = DAC;
+ pNv->or = pNv->i2cMap[port].dac;
+ }
+
+ xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
+ "Found a %s on I2C port %i, assigning %s%i\n",
+ flatPanel ? "flat panel" : "CRT",
+ port, flatPanel ? "SOR" : "DAC", pNv->or);
+
+ pScrn->monitor->DDC = monInfo;
+ xf86SetDDCproperties(pScrn, monInfo);
+
+ return TRUE;
+ }
+
+ return FALSE;
+}
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