/* 
 *  Copyright (C) 1998 Itai Nahshon, Michael Schimek
 */


#ifndef _XF86I2C_H
#define _XF86I2C_H

typedef int Bool;
#define TRUE 1
#define FALSE 0

typedef unsigned char  I2CByte;
typedef unsigned short I2CSlaveAddr;

typedef struct _I2CBusRec *I2CBusPtr;
typedef struct _I2CDevRec *I2CDevPtr;

/* I2C masters have to register themselves */

typedef struct _I2CBusRec {
    char *		BusName;
    int			scrnIndex;
    
    void		(*I2CUDelay) (I2CBusPtr b, int usec);
    
    void		(*I2CPutBits)(I2CBusPtr b, int  scl, int  sda);
    void		(*I2CGetBits)(I2CBusPtr b, int *scl, int *sda);

    /* Look at the generic routines to see how these functions should behave. */

    Bool        	(*I2CStart)  (I2CBusPtr b, int timeout);
    Bool        	(*I2CAddress)(I2CDevPtr d, I2CSlaveAddr);
    void        	(*I2CStop)   (I2CDevPtr d);
    Bool		(*I2CPutByte)(I2CDevPtr d, I2CByte data);
    Bool		(*I2CGetByte)(I2CDevPtr d, I2CByte *data, Bool);

    int         	HoldTime; 	/* 1 / bus clock frequency, 5 or 2 usec */

    int			BitTimeout;	/* usec */
    int 		ByteTimeout;	/* usec */
    int			AcknTimeout;    /* usec */
    int 		StartTimeout;	/* usec */
    int                 RiseFallTime;   /* usec */

    I2CDevPtr		FirstDev;
    I2CBusPtr		NextBus;
    Bool 		(*I2CWriteRead)(I2CDevPtr d, I2CByte *WriteBuffer, int nWrite,
		                   I2CByte *ReadBuffer,  int nRead);
} I2CBusRec;

I2CBusPtr 	xf86CreateI2CBusRec(void);
void      	xf86DestroyI2CBusRec(I2CBusPtr pI2CBus, Bool unalloc, Bool devs_too);
Bool      	xf86I2CBusInit(I2CBusPtr pI2CBus);
I2CBusPtr 	xf86I2CFindBus(int scrnIndex, char *name);
int		xf86I2CGetScreenBuses(int scrnIndex, I2CBusPtr **pppI2CBus);


/* I2C slave devices */

typedef struct _I2CDevRec {
    char *		DevName;

    int			BitTimeout;	/* usec */
    int 		ByteTimeout;	/* usec */
    int			AcknTimeout;    /* usec */
    int 		StartTimeout;	/* usec */

    I2CSlaveAddr	SlaveAddr;
    I2CBusPtr		pI2CBus;
    I2CDevPtr		NextDev;
} I2CDevRec;

I2CDevPtr 	xf86CreateI2CDevRec(void);
void      	xf86DestroyI2CDevRec(I2CDevPtr pI2CDev, Bool unalloc);
Bool      	xf86I2CDevInit(I2CDevPtr pI2CDev);
I2CDevPtr 	xf86I2CFindDev(I2CBusPtr, I2CSlaveAddr);

/* See descriptions of these functions in xf86i2c.c */

Bool	  	xf86I2CProbeAddress(I2CBusPtr pI2CBus, I2CSlaveAddr);
Bool 		xf86I2CWriteRead(I2CDevPtr d, I2CByte *WriteBuffer, int nWrite,
		                   I2CByte *ReadBuffer,  int nRead);
#define 	xf86I2CRead(d, rb, nr) xf86I2CWriteRead(d, NULL, 0, rb, nr)
Bool 		xf86I2CReadStatus(I2CDevPtr d, I2CByte *pbyte);
Bool 		xf86I2CReadByte(I2CDevPtr d, I2CByte subaddr, I2CByte *pbyte);
Bool 		xf86I2CReadBytes(I2CDevPtr d, I2CByte subaddr, I2CByte *pbyte, int n);
Bool 		xf86I2CReadWord(I2CDevPtr d, I2CByte subaddr, unsigned short *pword);
#define 	xf86I2CWrite(d, wb, nw) xf86I2CWriteRead(d, wb, nw, NULL, 0)
Bool 		xf86I2CWriteByte(I2CDevPtr d, I2CByte subaddr, I2CByte byte);
Bool 		xf86I2CWriteBytes(I2CDevPtr d, I2CByte subaddr, I2CByte *WriteBuffer, int nWrite);
Bool 		xf86I2CWriteWord(I2CDevPtr d, I2CByte subaddr, unsigned short word);
Bool 		xf86I2CWriteVec(I2CDevPtr d, I2CByte *vec, int nValues);

#endif /*_XF86I2C_H */