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/* (c) Itai Nahshon */
/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/cirrus/alp_i2c.c,v 1.6 1999/02/28 11:19:38 dawes Exp $ */
#include "xf86.h"
#include "xf86_OSproc.h"
#include "xf86_ansic.h"
#include "compiler.h"
#include "xf86Pci.h"
#include "xf86PciInfo.h"
#include "vgaHW.h"
#include "cir.h"
#define _ALP_PRIVATE_
#include "alp.h"
/*
* Switch between internal I2C bus and external (DDC) bus.
* There is one I2C port controlled bu SR08 and the programmable
* outputs control a multiplexer.
*/
static Bool
AlpI2CSwitchToBus(I2CBusPtr b)
{
CirPtr pCir = ((CirPtr)b->DriverPrivate.ptr);
vgaHWPtr hwp = VGAHWPTR(pCir->pScrn);
CARD8 reg = hwp->readGr(hwp, 0x17);
if (b == pCir->I2CPtr1) {
if ((reg & 0x60) == 0)
return TRUE;
reg &= ~0x60;
}
else if(b == pCir->I2CPtr2) {
if ((reg & 0x60) != 0)
return TRUE;
reg |= 0x60;
} else return FALSE;
/* ErrorF("AlpI2CSwitchToBus: \"%s\"\n", b->BusName); */
hwp->writeGr(hwp, 0x17, reg);
return TRUE;
}
static void
AlpI2CPutBits(I2CBusPtr b, int clock, int data)
{
unsigned int reg = 0xfc;
CirPtr pCir = ((CirPtr)b->DriverPrivate.ptr);
vgaHWPtr hwp = VGAHWPTR(pCir->pScrn);
if (!AlpI2CSwitchToBus(b))
return;
if (clock) reg |= 1;
if (data) reg |= 2;
hwp->writeSeq(hwp, 0x08, reg);
/* ErrorF("AlpI2CPutBits: %d %d\n", clock, data); */
}
static void
AlpI2CGetBits(I2CBusPtr b, int *clock, int *data)
{
unsigned int reg;
CirPtr pCir = ((CirPtr)b->DriverPrivate.ptr);
vgaHWPtr hwp = VGAHWPTR(pCir->pScrn);
if (!AlpI2CSwitchToBus(b))
return;
reg = hwp->readSeq(hwp, 0x08);
*clock = (reg & 0x04) != 0;
*data = (reg & 0x80) != 0;
/* ErrorF("AlpI2CGetBits: %d %d\n", *clock, *data); */
}
Bool
AlpI2CInit(ScrnInfoPtr pScrn)
{
CirPtr pCir = CIRPTR(pScrn);
I2CBusPtr I2CPtr;
#ifdef ALP_DEBUG
ErrorF("AlpI2CInit\n");
#endif
switch(pCir->Chipset) {
case PCI_CHIP_GD5446:
case PCI_CHIP_GD5480:
break;
default:
return FALSE;
}
I2CPtr = xf86CreateI2CBusRec();
if (!I2CPtr) return FALSE;
pCir->I2CPtr1 = I2CPtr;
I2CPtr->BusName = "I2C bus 1";
I2CPtr->scrnIndex = pScrn->scrnIndex;
I2CPtr->I2CPutBits = AlpI2CPutBits;
I2CPtr->I2CGetBits = AlpI2CGetBits;
I2CPtr->DriverPrivate.ptr = pCir;
if (!xf86I2CBusInit(I2CPtr))
return FALSE;
I2CPtr = xf86CreateI2CBusRec();
if (!I2CPtr) return FALSE;
pCir->I2CPtr2 = I2CPtr;
I2CPtr->BusName = "I2C bus 2";
I2CPtr->scrnIndex = pScrn->scrnIndex;
I2CPtr->I2CPutBits = AlpI2CPutBits;
I2CPtr->I2CGetBits = AlpI2CGetBits;
I2CPtr->DriverPrivate.ptr = pCir;
if (!xf86I2CBusInit(I2CPtr))
return FALSE;
return TRUE;
}
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