/******************************************************************************
/
/       File:                   I2C.h
/
/       Description:    ATI Radeon I2C Serial Bus interface.
/
/       Copyright 2001, Carlos Hasan
/
*******************************************************************************/

#ifndef __I2C_PORT_H__
#define __I2C_PORT_H__

#include "Radeon.h"

enum i2c_port_clock_rate {
        C_RADEON_I2C_MIN_CLOCK_RATE             = 7500,
        C_RADEON_I2C_MAX_CLOCK_RATE             = 100000,
        C_RADEON_I2C_DEFAULT_CLOCK_RATE = 80000
};

class CI2CPort {
public:
        CI2CPort(CRadeon & radeon, int rate = C_RADEON_I2C_DEFAULT_CLOCK_RATE);
        
        ~CI2CPort();
        
        status_t InitCheck() const;
        
        CRadeon & Radeon() const;
        
        bool Probe(int address);
        
public: 
        bool Write(int address, const char * buffer, int length);
        
        bool Read(int address, char * buffer, int length);

        bool Write(int address, const char * buffer, int length, char * output, int outlen);

public: 
        int Register(int address, int index);

        void SetRegister(int address, int index, int value);

private:
        int Send(int address, const char * buffer, int length, bool start, bool stop);

        int Receive(int address, char * buffer, int length, bool start, bool stop);
        
        int WaitAck();

        void Stop();
        
private:
        CRadeon & fRadeon;
        int fNfactor;
        int fMfactor;
        int fTimeLimit;
        shared_info* si;
};


#endif