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