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Diffstat (limited to 'xorg-server/hw/xfree86/ddc/xf86DDC.c')
-rw-r--r--xorg-server/hw/xfree86/ddc/xf86DDC.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/xorg-server/hw/xfree86/ddc/xf86DDC.c b/xorg-server/hw/xfree86/ddc/xf86DDC.c
new file mode 100644
index 000000000..28e2ead28
--- /dev/null
+++ b/xorg-server/hw/xfree86/ddc/xf86DDC.c
@@ -0,0 +1,292 @@
+/* xf86DDC.c
+ *
+ * Copyright 1998,1999 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>
+ */
+#ifdef HAVE_XORG_CONFIG_H
+#include <xorg-config.h>
+#endif
+
+#include "misc.h"
+#include "xf86.h"
+#include "xf86_OSproc.h"
+#include "xf86DDC.h"
+#include "ddcPriv.h"
+#include <string.h>
+
+#define RETRIES 4
+
+static unsigned char *EDIDRead_DDC1(
+ ScrnInfoPtr pScrn,
+ DDC1SetSpeedProc,
+ unsigned int (*)(ScrnInfoPtr)
+);
+
+static Bool TestDDC1(
+ ScrnInfoPtr pScrn,
+ unsigned int (*)(ScrnInfoPtr)
+);
+
+static unsigned int *FetchEDID_DDC1(
+ ScrnInfoPtr,
+ register unsigned int (*)(ScrnInfoPtr)
+);
+
+static unsigned char* EDID1Read_DDC2(
+ int scrnIndex,
+ I2CBusPtr pBus
+);
+
+static unsigned char * DDCRead_DDC2(
+ int scrnIndex,
+ I2CBusPtr pBus,
+ int start,
+ int len
+);
+
+typedef enum {
+ DDCOPT_NODDC1,
+ DDCOPT_NODDC2,
+ DDCOPT_NODDC
+} DDCOpts;
+
+static const OptionInfoRec DDCOptions[] = {
+ { DDCOPT_NODDC1, "NoDDC1", OPTV_BOOLEAN, {0}, FALSE },
+ { DDCOPT_NODDC2, "NoDDC2", OPTV_BOOLEAN, {0}, FALSE },
+ { DDCOPT_NODDC, "NoDDC", OPTV_BOOLEAN, {0}, FALSE },
+ { -1, NULL, OPTV_NONE, {0}, FALSE },
+};
+
+/**
+ * Attempts to probe the monitor for EDID information, if NoDDC and NoDDC1 are
+ * unset. EDID information blocks are interpreted and the results returned in
+ * an xf86MonPtr.
+ *
+ * This function does not affect the list of modes used by drivers -- it is up
+ * to the driver to decide policy on what to do with EDID information.
+ *
+ * @return pointer to a new xf86MonPtr containing the EDID information.
+ * @return NULL if no monitor attached or failure to interpret the EDID.
+ */
+xf86MonPtr
+xf86DoEDID_DDC1(
+ int scrnIndex, DDC1SetSpeedProc DDC1SetSpeed,
+ unsigned int (*DDC1Read)(ScrnInfoPtr)
+)
+{
+ ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
+ unsigned char *EDID_block = NULL;
+ xf86MonPtr tmp = NULL;
+ int sigio;
+ /* Default DDC and DDC1 to enabled. */
+ Bool noddc = FALSE, noddc1 = FALSE;
+ OptionInfoPtr options;
+
+ options = xnfalloc(sizeof(DDCOptions));
+ (void)memcpy(options, DDCOptions, sizeof(DDCOptions));
+ xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, options);
+
+ xf86GetOptValBool(options, DDCOPT_NODDC, &noddc);
+ xf86GetOptValBool(options, DDCOPT_NODDC1, &noddc1);
+ xfree(options);
+
+ if (noddc || noddc1)
+ return NULL;
+
+ sigio = xf86BlockSIGIO();
+ EDID_block = EDIDRead_DDC1(pScrn,DDC1SetSpeed,DDC1Read);
+ xf86UnblockSIGIO(sigio);
+
+ if (EDID_block){
+ tmp = xf86InterpretEDID(scrnIndex,EDID_block);
+ }
+#ifdef DEBUG
+ else ErrorF("No EDID block returned\n");
+ if (!tmp)
+ ErrorF("Cannot interpret EDID block\n");
+#endif
+ return tmp;
+}
+
+/**
+ * Attempts to probe the monitor for EDID information, if NoDDC and NoDDC2 are
+ * unset. EDID information blocks are interpreted and the results returned in
+ * an xf86MonPtr.
+ *
+ * This function does not affect the list of modes used by drivers -- it is up
+ * to the driver to decide policy on what to do with EDID information.
+ *
+ * @return pointer to a new xf86MonPtr containing the EDID information.
+ * @return NULL if no monitor attached or failure to interpret the EDID.
+ */
+xf86MonPtr
+xf86DoEDID_DDC2(int scrnIndex, I2CBusPtr pBus)
+{
+ ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
+ unsigned char *EDID_block = NULL;
+ xf86MonPtr tmp = NULL;
+ /* Default DDC and DDC2 to enabled. */
+ Bool noddc = FALSE, noddc2 = FALSE;
+ OptionInfoPtr options;
+
+ options = xnfalloc(sizeof(DDCOptions));
+ (void)memcpy(options, DDCOptions, sizeof(DDCOptions));
+ xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, options);
+
+ xf86GetOptValBool(options, DDCOPT_NODDC, &noddc);
+ xf86GetOptValBool(options, DDCOPT_NODDC2, &noddc2);
+ xfree(options);
+
+ if (noddc || noddc2)
+ return NULL;
+
+ EDID_block = EDID1Read_DDC2(scrnIndex,pBus);
+
+ if (EDID_block){
+ tmp = xf86InterpretEDID(scrnIndex,EDID_block);
+ } else {
+#ifdef DEBUG
+ ErrorF("No EDID block returned\n");
+#endif
+ return NULL;
+ }
+#ifdef DEBUG
+ if (!tmp)
+ ErrorF("Cannot interpret EDID block\n");
+ else
+ ErrorF("Sections to follow: %i\n",tmp->no_sections);
+#endif
+
+ return tmp;
+}
+
+/*
+ * read EDID record , pass it to callback function to interpret.
+ * callback function will store it for further use by calling
+ * function; it will also decide if we need to reread it
+ */
+static unsigned char *
+EDIDRead_DDC1(ScrnInfoPtr pScrn, DDC1SetSpeedProc DDCSpeed,
+ unsigned int (*read_DDC)(ScrnInfoPtr))
+{
+ unsigned char *EDID_block = NULL;
+ int count = RETRIES;
+
+ if (!read_DDC) {
+ xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
+ "chipset doesn't support DDC1\n");
+ return NULL;
+ };
+
+ if (TestDDC1(pScrn,read_DDC)==-1) {
+ xf86DrvMsg(pScrn->scrnIndex, X_PROBED, "No DDC signal\n");
+ return NULL;
+ };
+
+ if (DDCSpeed) DDCSpeed(pScrn,DDC_FAST);
+ do {
+ EDID_block = GetEDID_DDC1(FetchEDID_DDC1(pScrn,read_DDC));
+ count --;
+ } while (!EDID_block && count);
+ if (DDCSpeed) DDCSpeed(pScrn,DDC_SLOW);
+
+ return EDID_block;
+}
+
+/* test if DDC1 return 0 if not */
+static Bool
+TestDDC1(ScrnInfoPtr pScrn, unsigned int (*read_DDC)(ScrnInfoPtr))
+{
+ int old, count;
+
+ old = read_DDC(pScrn);
+ count = HEADER * BITS_PER_BYTE;
+ do {
+ /* wait for next retrace */
+ if (old != read_DDC(pScrn)) break;
+ } while(count--);
+ return (count);
+}
+
+/* fetch entire EDID record; DDC bit needs to be masked */
+static unsigned int *
+FetchEDID_DDC1(register ScrnInfoPtr pScrn,
+ register unsigned int (*read_DDC)(ScrnInfoPtr))
+{
+ int count = NUM;
+ unsigned int *ptr, *xp;
+
+ ptr=xp=xalloc(sizeof(int)*NUM);
+
+ if (!ptr) return NULL;
+ do {
+ /* wait for next retrace */
+ *xp = read_DDC(pScrn);
+ xp++;
+ } while(--count);
+ return (ptr);
+}
+
+static unsigned char*
+EDID1Read_DDC2(int scrnIndex, I2CBusPtr pBus)
+{
+ return DDCRead_DDC2(scrnIndex, pBus, 0, EDID1_LEN);
+}
+
+static unsigned char *
+DDCRead_DDC2(int scrnIndex, I2CBusPtr pBus, int start, int len)
+{
+ I2CDevPtr dev;
+ unsigned char W_Buffer[2];
+ int w_bytes;
+ unsigned char *R_Buffer;
+ int i;
+
+ /*
+ * Slow down the bus so that older monitors don't
+ * miss things.
+ */
+ pBus->RiseFallTime = 20;
+
+ if (!(dev = xf86I2CFindDev(pBus, 0x00A0))) {
+ dev = xf86CreateI2CDevRec();
+ dev->DevName = "ddc2";
+ dev->SlaveAddr = 0xA0;
+ dev->ByteTimeout = 2200; /* VESA DDC spec 3 p. 43 (+10 %) */
+ dev->StartTimeout = 550;
+ dev->BitTimeout = 40;
+ dev->AcknTimeout = 40;
+
+ dev->pI2CBus = pBus;
+ if (!xf86I2CDevInit(dev)) {
+ xf86DrvMsg(scrnIndex, X_PROBED, "No DDC2 device\n");
+ return NULL;
+ }
+ }
+ if (start < 0x100) {
+ w_bytes = 1;
+ W_Buffer[0] = start;
+ } else {
+ w_bytes = 2;
+ W_Buffer[0] = start & 0xFF;
+ W_Buffer[1] = (start & 0xFF00) >> 8;
+ }
+ R_Buffer = xcalloc(1,sizeof(unsigned char)
+ * (len));
+ for (i=0; i<RETRIES; i++) {
+ if (xf86I2CWriteRead(dev, W_Buffer,w_bytes, R_Buffer,len)) {
+ if (!DDC_checksum(R_Buffer,len))
+ return R_Buffer;
+
+#ifdef DEBUG
+ else ErrorF("Checksum error in EDID block\n");
+#endif
+ }
+#ifdef DEBUG
+ else ErrorF("Error reading EDID block\n");
+#endif
+ }
+
+ xf86DestroyI2CDevRec(dev,TRUE);
+ xfree(R_Buffer);
+ return NULL;
+}
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