/* xf86DDC.c * * Copyright 1998,1999 by Egbert Eich */ /* * Note that DDC1 does not define any method for returning blocks beyond * the first. DDC2 does, but the original implementation would only ever * read the first block. If you want to read and parse all blocks, use * xf86DoEEDID(). */ #ifdef HAVE_XORG_CONFIG_H #include #endif #include "misc.h" #include "xf86.h" #include "xf86_OSproc.h" #include "xf86DDC.h" #include "ddcPriv.h" #include #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) ); 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; } 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; DDC2MakeDevice(pBus, 0x0060, "E-EDID segment register"); dev = DDC2MakeDevice(pBus, 0x00A0, "ddc2"); 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 |= 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); } /* * 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); }