xserver git update 15/5/2010

1 files changed, 507 insertions, 507 deletions

diff --git a/xorg-server/hw/xfree86/ddc/ddc.c b/xorg-server/hw/xfree86/ddc/ddc.c
index 6fad9fbbc..ec6465818 100644
--- a/xorg-server/hw/xfree86/ddc/ddc.c
+++ b/xorg-server/hw/xfree86/ddc/ddc.c
@@ -1,507 +1,507 @@
-/* xf86DDC.c 
- * 
- * Copyright 1998,1999 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>
- */
-
-/*
- * A note on terminology.  DDC1 is the original dumb serial protocol, and
- * can only do up to 128 bytes of EDID.  DDC2 is I2C-encapsulated and
- * introduces extension blocks.  EDID is the old display identification
- * block, DisplayID is the new one.
- */
-
-#ifdef HAVE_XORG_CONFIG_H
-#include <xorg-config.h>
-#endif
-
-#include "misc.h"
-#include "xf86.h"
-#include "xf86_OSproc.h"
-#include "xf86DDC.h"
-#include <string.h>
-
-#define RETRIES 4
-
-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 },
-};
-
-/* DDC1 */
-
-static int
-find_start(unsigned int *ptr)
-{
-    unsigned int comp[9], test[9];
-    int i,j;
-  
-    for (i=0;i<9;i++){
-	comp[i] = *(ptr++);
-	test[i] = 1;
-    }
-    for (i=0;i<127;i++){
-	for (j=0;j<9;j++){
-	    test[j] = test[j] & !(comp[j] ^ *(ptr++));
-	}
-    }
-    for (i=0;i<9;i++)
-	if (test[i]) return (i+1);
-    return (-1);
-}
-
-static unsigned char *
-find_header(unsigned char *block)
-{
-    unsigned char *ptr, *head_ptr, *end;
-    unsigned char header[]={0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00};
- 
-    ptr = block;
-    end = block + EDID1_LEN;
-    while (ptr<end) {
-	int i;
-	head_ptr = ptr;
-	for (i=0;i<8;i++){
-	    if (header[i] != *(head_ptr++)) break;
-	    if (head_ptr == end) head_ptr = block;
-	}
-	if (i==8) break;
-	ptr++; 
-    }
-    if (ptr == end) return (NULL);
-    return (ptr);
-}
-
-static unsigned char *
-resort(unsigned char *s_block)
-{
-    unsigned char *d_new, *d_ptr, *d_end, *s_ptr, *s_end;
-    unsigned char tmp;
-
-    s_end = s_block + EDID1_LEN;
-    d_new = xalloc(EDID1_LEN);
-    if (!d_new) return NULL;
-    d_end = d_new + EDID1_LEN;
-
-    s_ptr = find_header(s_block);
-    if (!s_ptr) return NULL;
-    for (d_ptr=d_new;d_ptr<d_end;d_ptr++){
-	tmp = *(s_ptr++);
-	*d_ptr = tmp; 
-	if (s_ptr == s_end) s_ptr = s_block;
-    }
-    xfree(s_block);
-    return (d_new);
-}
-
-static int
-DDC_checksum(unsigned char *block, int len)
-{
-    int i, result = 0;
-    int not_null = 0;
-    
-    for (i=0;i<len;i++) {
-	not_null |= block[i];
-	result += block[i];
-    }
-    
-#ifdef DEBUG
-    if (result & 0xFF) ErrorF("DDC checksum not correct\n");
-    if (!not_null) ErrorF("DDC read all Null\n");
-#endif
-
-    /* catch the trivial case where all bytes are 0 */
-    if (!not_null) return 1;
-
-    return (result&0xFF);
-}
-
-static unsigned char *
-GetEDID_DDC1(unsigned int *s_ptr)
-{
-    unsigned char *d_block, *d_pos;
-    unsigned int *s_pos, *s_end;
-    int s_start;
-    int i,j;
-    s_start = find_start(s_ptr);
-    if (s_start==-1) return NULL;
-    s_end = s_ptr + NUM;
-    s_pos = s_ptr + s_start;
-    d_block=xalloc(EDID1_LEN);
-    if (!d_block) return NULL;
-    d_pos = d_block;
-    for (i=0;i<EDID1_LEN;i++) {
-	for (j=0;j<8;j++) {
-	    *d_pos <<= 1;
-	    if (*s_pos) {
-		*d_pos |= 0x01;
-	    }
-	    s_pos++; if (s_pos == s_end) s_pos=s_ptr;
-	};
-	s_pos++; if (s_pos == s_end) s_pos=s_ptr;
-	d_pos++;
-    }
-    xfree(s_ptr);
-    if (d_block && DDC_checksum(d_block,EDID1_LEN)) return NULL;
-    return (resort(d_block));
-}
-
-/* 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);
-}
-
-/* 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);
-}
-
-/* 
- * 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;
-}
-
-/**
- * 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;
-}
-
-/* DDC2 */
-
-static I2CDevPtr
-DDC2MakeDevice(I2CBusPtr pBus, int address, char *name)
-{
-    I2CDevPtr dev = NULL;
-
-    if (!(dev = xf86I2CFindDev(pBus, address))) {
-	dev = xf86CreateI2CDevRec();
-	dev->DevName = name;
-	dev->SlaveAddr = address;
-	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(pBus->scrnIndex, X_PROBED, "No DDC2 device\n");
-	    return NULL;
-	}
-    }
-
-    return dev;
-}
-
-static I2CDevPtr
-DDC2Init(int scrnIndex, I2CBusPtr pBus)
-{
-    I2CDevPtr dev = NULL;
-
-    /*
-     * Slow down the bus so that older monitors don't 
-     * miss things.
-     */
-    pBus->RiseFallTime = 20;
- 
-    dev = DDC2MakeDevice(pBus, 0x00A0, "ddc2");
-    if (xf86I2CProbeAddress(pBus, 0x0060))
-	DDC2MakeDevice(pBus, 0x0060, "E-EDID segment register");
-    if (xf86I2CProbeAddress(pBus, 0x0062))
-	DDC2MakeDevice(pBus, 0x0062, "EDID EEPROM interface");
-    if (xf86I2CProbeAddress(pBus, 0x006E))
-	DDC2MakeDevice(pBus, 0x006E, "DDC control interface");
-
-    return dev;
-}
-
-/* Mmmm, smell the hacks */
-static void
-EEDIDStop(I2CDevPtr d)
-{
-}
-
-/* block is the EDID block number.  a segment is two blocks. */
-static Bool
-DDC2Read(I2CDevPtr dev, int block, unsigned char *R_Buffer)
-{
-    unsigned char W_Buffer[1];
-    int i, segment;
-    I2CDevPtr seg;
-    void (*stop)(I2CDevPtr);
-
-    for (i = 0; i < RETRIES; i++) {
-	/* Stop bits reset the segment pointer to 0, so be careful here. */
-	segment = block >> 1;
-	if (segment) {
-	    Bool b;
-	    
-	    if (!(seg = xf86I2CFindDev(dev->pI2CBus, 0x0060)))
-		return FALSE;
-
-	    W_Buffer[0] = segment;
-
-	    stop = dev->pI2CBus->I2CStop;
-	    dev->pI2CBus->I2CStop = EEDIDStop;
-
-	    b = xf86I2CWriteRead(seg, W_Buffer, 1, NULL, 0);
-
-	    dev->pI2CBus->I2CStop = stop;
-	    if (!b) {
-		dev->pI2CBus->I2CStop(dev);
-		continue;
-	    }
-	}
-
-	W_Buffer[0] = (block & 0x01) * EDID1_LEN;
-
-	if (xf86I2CWriteRead(dev, W_Buffer, 1, R_Buffer, EDID1_LEN)) {
-	    if (!DDC_checksum(R_Buffer, EDID1_LEN))
-		return TRUE;
-	}
-    }
- 
-    return FALSE;
-}
-
-/**
- * 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.  Unlike xf86DoEDID_DDC[12](), this function will return
- * the complete EDID data, including all extension blocks, if the 'complete'
- * parameter is TRUE;
- *
- * 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
-xf86DoEEDID(int scrnIndex, I2CBusPtr pBus, Bool complete)
-{
-    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
-    unsigned char *EDID_block = NULL;
-    xf86MonPtr tmp = NULL;
-    I2CDevPtr dev = NULL;
-    /* Default DDC and DDC2 to enabled. */
-    Bool noddc = FALSE, noddc2 = FALSE;
-    OptionInfoPtr options;
-
-    options = xalloc(sizeof(DDCOptions));
-    if (!options)
-	return NULL;
-    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;
-
-    if (!(dev = DDC2Init(scrnIndex, pBus)))
-	return NULL;
-
-    EDID_block = xcalloc(1, EDID1_LEN);
-    if (!EDID_block)
-	return NULL;
-
-    if (DDC2Read(dev, 0, EDID_block)) {
-	int i, n = EDID_block[0x7e];
-
-	if (complete && n) {
-	    EDID_block = xrealloc(EDID_block, EDID1_LEN * (1+n));
-
-	    for (i = 0; i < n; i++)
-		DDC2Read(dev, i+1, EDID_block + (EDID1_LEN * (1+i)));
-	}
-
-	tmp = xf86InterpretEEDID(scrnIndex, EDID_block);
-    }
-
-    if (tmp && complete)
-	tmp->flags |= MONITOR_EDID_COMPLETE_RAWDATA;
-
-    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)
-{
-    return xf86DoEEDID(scrnIndex, pBus, FALSE);
-}
-
-/* XXX write me */
-static void *
-DDC2ReadDisplayID(void)
-{
-    return FALSE;
-}
-
-/**
- * Attempts to probe the monitor for DisplayID information, if NoDDC and
- * NoDDC2 are unset.  DisplayID 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 DisplayID information.
- *
- * @return pointer to a new xf86MonPtr containing the DisplayID information.
- * @return NULL if no monitor attached or failure to interpret the DisplayID.
- */
-xf86MonPtr
-xf86DoDisplayID(int scrnIndex, I2CBusPtr pBus)
-{
-    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
-    unsigned char *did = NULL;
-    xf86MonPtr tmp = NULL;
-    I2CDevPtr dev = NULL;
-    /* Default DDC and DDC2 to enabled. */
-    Bool noddc = FALSE, noddc2 = FALSE;
-    OptionInfoPtr options;
-
-    options = xalloc(sizeof(DDCOptions));
-    if (!options)
-	return NULL;
-    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;
-
-    if (!(dev = DDC2Init(scrnIndex, pBus)))
-	return NULL;
-
-    if ((did = DDC2ReadDisplayID())) {
-	tmp = xcalloc(1, sizeof(*tmp));
-	if (!tmp)
-	    return NULL;
-
-	tmp->scrnIndex = scrnIndex;
-	tmp->flags |= MONITOR_DISPLAYID;
-	tmp->rawData = did;
-    }
-
-    return tmp;
-}
+/* xf86DDC.c 

+ * 

+ * Copyright 1998,1999 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>

+ */

+

+/*

+ * A note on terminology.  DDC1 is the original dumb serial protocol, and

+ * can only do up to 128 bytes of EDID.  DDC2 is I2C-encapsulated and

+ * introduces extension blocks.  EDID is the old display identification

+ * block, DisplayID is the new one.

+ */

+

+#ifdef HAVE_XORG_CONFIG_H

+#include <xorg-config.h>

+#endif

+

+#include "misc.h"

+#include "xf86.h"

+#include "xf86_OSproc.h"

+#include "xf86DDC.h"

+#include <string.h>

+

+#define RETRIES 4

+

+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 },

+};

+

+/* DDC1 */

+

+static int

+find_start(unsigned int *ptr)

+{

+    unsigned int comp[9], test[9];

+    int i,j;

+  

+    for (i=0;i<9;i++){

+	comp[i] = *(ptr++);

+	test[i] = 1;

+    }

+    for (i=0;i<127;i++){

+	for (j=0;j<9;j++){

+	    test[j] = test[j] & !(comp[j] ^ *(ptr++));

+	}

+    }

+    for (i=0;i<9;i++)

+	if (test[i]) return (i+1);

+    return (-1);

+}

+

+static unsigned char *

+find_header(unsigned char *block)

+{

+    unsigned char *ptr, *head_ptr, *end;

+    unsigned char header[]={0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00};

+ 

+    ptr = block;

+    end = block + EDID1_LEN;

+    while (ptr<end) {

+	int i;

+	head_ptr = ptr;

+	for (i=0;i<8;i++){

+	    if (header[i] != *(head_ptr++)) break;

+	    if (head_ptr == end) head_ptr = block;

+	}

+	if (i==8) break;

+	ptr++; 

+    }

+    if (ptr == end) return (NULL);

+    return (ptr);

+}

+

+static unsigned char *

+resort(unsigned char *s_block)

+{

+    unsigned char *d_new, *d_ptr, *d_end, *s_ptr, *s_end;

+    unsigned char tmp;

+

+    s_end = s_block + EDID1_LEN;

+    d_new = malloc(EDID1_LEN);

+    if (!d_new) return NULL;

+    d_end = d_new + EDID1_LEN;

+

+    s_ptr = find_header(s_block);

+    if (!s_ptr) return NULL;

+    for (d_ptr=d_new;d_ptr<d_end;d_ptr++){

+	tmp = *(s_ptr++);

+	*d_ptr = tmp; 

+	if (s_ptr == s_end) s_ptr = s_block;

+    }

+    free(s_block);

+    return (d_new);

+}

+

+static int

+DDC_checksum(unsigned char *block, int len)

+{

+    int i, result = 0;

+    int not_null = 0;

+    

+    for (i=0;i<len;i++) {

+	not_null |= block[i];

+	result += block[i];

+    }

+    

+#ifdef DEBUG

+    if (result & 0xFF) ErrorF("DDC checksum not correct\n");

+    if (!not_null) ErrorF("DDC read all Null\n");

+#endif

+

+    /* catch the trivial case where all bytes are 0 */

+    if (!not_null) return 1;

+

+    return (result&0xFF);

+}

+

+static unsigned char *

+GetEDID_DDC1(unsigned int *s_ptr)

+{

+    unsigned char *d_block, *d_pos;

+    unsigned int *s_pos, *s_end;

+    int s_start;

+    int i,j;

+    s_start = find_start(s_ptr);

+    if (s_start==-1) return NULL;

+    s_end = s_ptr + NUM;

+    s_pos = s_ptr + s_start;

+    d_block=malloc(EDID1_LEN);

+    if (!d_block) return NULL;

+    d_pos = d_block;

+    for (i=0;i<EDID1_LEN;i++) {

+	for (j=0;j<8;j++) {

+	    *d_pos <<= 1;

+	    if (*s_pos) {

+		*d_pos |= 0x01;

+	    }

+	    s_pos++; if (s_pos == s_end) s_pos=s_ptr;

+	};

+	s_pos++; if (s_pos == s_end) s_pos=s_ptr;

+	d_pos++;

+    }

+    free(s_ptr);

+    if (d_block && DDC_checksum(d_block,EDID1_LEN)) return NULL;

+    return (resort(d_block));

+}

+

+/* 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=malloc(sizeof(int)*NUM);

+

+    if (!ptr)  return NULL;

+    do {

+	/* wait for next retrace */

+	*xp = read_DDC(pScrn);

+	xp++;

+    } while(--count);

+    return (ptr);

+}

+

+/* 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);

+}

+

+/* 

+ * 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;

+}

+

+/**

+ * 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);

+    free(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;

+}

+

+/* DDC2 */

+

+static I2CDevPtr

+DDC2MakeDevice(I2CBusPtr pBus, int address, char *name)

+{

+    I2CDevPtr dev = NULL;

+

+    if (!(dev = xf86I2CFindDev(pBus, address))) {

+	dev = xf86CreateI2CDevRec();

+	dev->DevName = name;

+	dev->SlaveAddr = address;

+	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(pBus->scrnIndex, X_PROBED, "No DDC2 device\n");

+	    return NULL;

+	}

+    }

+

+    return dev;

+}

+

+static I2CDevPtr

+DDC2Init(int scrnIndex, I2CBusPtr pBus)

+{

+    I2CDevPtr dev = NULL;

+

+    /*

+     * Slow down the bus so that older monitors don't 

+     * miss things.

+     */

+    pBus->RiseFallTime = 20;

+ 

+    dev = DDC2MakeDevice(pBus, 0x00A0, "ddc2");

+    if (xf86I2CProbeAddress(pBus, 0x0060))

+	DDC2MakeDevice(pBus, 0x0060, "E-EDID segment register");

+    if (xf86I2CProbeAddress(pBus, 0x0062))

+	DDC2MakeDevice(pBus, 0x0062, "EDID EEPROM interface");

+    if (xf86I2CProbeAddress(pBus, 0x006E))

+	DDC2MakeDevice(pBus, 0x006E, "DDC control interface");

+

+    return dev;

+}

+

+/* Mmmm, smell the hacks */

+static void

+EEDIDStop(I2CDevPtr d)

+{

+}

+

+/* block is the EDID block number.  a segment is two blocks. */

+static Bool

+DDC2Read(I2CDevPtr dev, int block, unsigned char *R_Buffer)

+{

+    unsigned char W_Buffer[1];

+    int i, segment;

+    I2CDevPtr seg;

+    void (*stop)(I2CDevPtr);

+

+    for (i = 0; i < RETRIES; i++) {

+	/* Stop bits reset the segment pointer to 0, so be careful here. */

+	segment = block >> 1;

+	if (segment) {

+	    Bool b;

+	    

+	    if (!(seg = xf86I2CFindDev(dev->pI2CBus, 0x0060)))

+		return FALSE;

+

+	    W_Buffer[0] = segment;

+

+	    stop = dev->pI2CBus->I2CStop;

+	    dev->pI2CBus->I2CStop = EEDIDStop;

+

+	    b = xf86I2CWriteRead(seg, W_Buffer, 1, NULL, 0);

+

+	    dev->pI2CBus->I2CStop = stop;

+	    if (!b) {

+		dev->pI2CBus->I2CStop(dev);

+		continue;

+	    }

+	}

+

+	W_Buffer[0] = (block & 0x01) * EDID1_LEN;

+

+	if (xf86I2CWriteRead(dev, W_Buffer, 1, R_Buffer, EDID1_LEN)) {

+	    if (!DDC_checksum(R_Buffer, EDID1_LEN))

+		return TRUE;

+	}

+    }

+ 

+    return FALSE;

+}

+

+/**

+ * 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.  Unlike xf86DoEDID_DDC[12](), this function will return

+ * the complete EDID data, including all extension blocks, if the 'complete'

+ * parameter is TRUE;

+ *

+ * 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

+xf86DoEEDID(int scrnIndex, I2CBusPtr pBus, Bool complete)

+{

+    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];

+    unsigned char *EDID_block = NULL;

+    xf86MonPtr tmp = NULL;

+    I2CDevPtr dev = NULL;

+    /* Default DDC and DDC2 to enabled. */

+    Bool noddc = FALSE, noddc2 = FALSE;

+    OptionInfoPtr options;

+

+    options = malloc(sizeof(DDCOptions));

+    if (!options)

+	return NULL;

+    memcpy(options, DDCOptions, sizeof(DDCOptions));

+    xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, options);

+

+    xf86GetOptValBool(options, DDCOPT_NODDC, &noddc);

+    xf86GetOptValBool(options, DDCOPT_NODDC2, &noddc2);

+    free(options);

+

+    if (noddc || noddc2)

+	return NULL;

+

+    if (!(dev = DDC2Init(scrnIndex, pBus)))

+	return NULL;

+

+    EDID_block = calloc(1, EDID1_LEN);

+    if (!EDID_block)

+	return NULL;

+

+    if (DDC2Read(dev, 0, EDID_block)) {

+	int i, n = EDID_block[0x7e];

+

+	if (complete && n) {

+	    EDID_block = realloc(EDID_block, EDID1_LEN * (1+n));

+

+	    for (i = 0; i < n; i++)

+		DDC2Read(dev, i+1, EDID_block + (EDID1_LEN * (1+i)));

+	}

+

+	tmp = xf86InterpretEEDID(scrnIndex, EDID_block);

+    }

+

+    if (tmp && complete)

+	tmp->flags |= MONITOR_EDID_COMPLETE_RAWDATA;

+

+    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)

+{

+    return xf86DoEEDID(scrnIndex, pBus, FALSE);

+}

+

+/* XXX write me */

+static void *

+DDC2ReadDisplayID(void)

+{

+    return FALSE;

+}

+

+/**

+ * Attempts to probe the monitor for DisplayID information, if NoDDC and

+ * NoDDC2 are unset.  DisplayID 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 DisplayID information.

+ *

+ * @return pointer to a new xf86MonPtr containing the DisplayID information.

+ * @return NULL if no monitor attached or failure to interpret the DisplayID.

+ */

+xf86MonPtr

+xf86DoDisplayID(int scrnIndex, I2CBusPtr pBus)

+{

+    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];

+    unsigned char *did = NULL;

+    xf86MonPtr tmp = NULL;

+    I2CDevPtr dev = NULL;

+    /* Default DDC and DDC2 to enabled. */

+    Bool noddc = FALSE, noddc2 = FALSE;

+    OptionInfoPtr options;

+

+    options = malloc(sizeof(DDCOptions));

+    if (!options)

+	return NULL;

+    memcpy(options, DDCOptions, sizeof(DDCOptions));

+    xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, options);

+

+    xf86GetOptValBool(options, DDCOPT_NODDC, &noddc);

+    xf86GetOptValBool(options, DDCOPT_NODDC2, &noddc2);

+    free(options);

+

+    if (noddc || noddc2)

+	return NULL;

+

+    if (!(dev = DDC2Init(scrnIndex, pBus)))

+	return NULL;

+

+    if ((did = DDC2ReadDisplayID())) {

+	tmp = calloc(1, sizeof(*tmp));

+	if (!tmp)

+	    return NULL;

+

+	tmp->scrnIndex = scrnIndex;

+	tmp->flags |= MONITOR_DISPLAYID;

+	tmp->rawData = did;

+    }

+

+    return tmp;

+}