xref: /xsrc/external/mit/xf86-video-cirrus/dist/src/lg_i2c.c

/* (c) Itai Nahshon */

/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/cirrus/lg_i2c.c,v 1.1 1998/11/15 04:30:25 dawes Exp $ */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "xf86.h"
#include "xf86_OSproc.h"
#include "compiler.h"

#include "xf86Pci.h"
#include "xf86PciInfo.h"

#include "vgaHW.h"

#include "cir.h"
#define _LG_PRIVATE_
#include "lg.h"

static void
LgI2CPutBits(I2CBusPtr b, int clock,  int data)
{
	unsigned int regval, regno;
	CirPtr pCir = ((CirPtr)b->DriverPrivate.ptr);
	if (b == pCir->I2CPtr1)
		regno = 0x280;
	else if (b == pCir->I2CPtr2)
		regno = 0x282;
	else
		return;

	regval = 0xff7e;
	if (clock) regval |= 0x0080;
	if (data)  regval |= 0x0001;
	memww(regno, regval);
	/* ErrorF("LgI2CPutBits: %d %d\n", clock, data); */
}

static void
LgI2CGetBits(I2CBusPtr b, int *clock, int *data)
{
	unsigned int regval, regno;
	CirPtr pCir = ((CirPtr)b->DriverPrivate.ptr);
	if (b == pCir->I2CPtr1)
		regno = 0x280;
	else if (b == pCir->I2CPtr2)
		regno = 0x282;
	else
		return;

	regval = memrw(regno);
	*clock = (regval & 0x8000) != 0;
	*data  = (regval & 0x0100) != 0;
	/* ErrorF("LgI2CGetBits: %d %d\n", *clock, *data); */
}

Bool
LgI2CInit(ScrnInfoPtr pScrn)
{
	CirPtr pCir = CIRPTR(pScrn);
	I2CBusPtr I2CPtr;

#ifdef LG_DEBUG
	ErrorF("LgI2CInit\n");
#endif

	I2CPtr = xf86CreateI2CBusRec();
	if (!I2CPtr) return FALSE;

	pCir->I2CPtr1 = I2CPtr;

	I2CPtr->BusName				= "I2C bus 1";
	I2CPtr->scrnIndex			= pScrn->scrnIndex;
	I2CPtr->I2CPutBits			= LgI2CPutBits;
	I2CPtr->I2CGetBits			= LgI2CGetBits;
	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			= LgI2CPutBits;
	I2CPtr->I2CGetBits			= LgI2CGetBits;
	I2CPtr->DriverPrivate.ptr	= pCir;

	if (!xf86I2CBusInit(I2CPtr))
		return FALSE;

	return TRUE;
}