src/add-ons/media/media-add-ons/radeon/I2CPort.h

   1 /******************************************************************************
   2 /
   3 /       File:                   I2C.h
   4 /
   5 /       Description:    ATI Radeon I2C Serial Bus interface.
   6 /
   7 /       Copyright 2001, Carlos Hasan
   8 /
   9 *******************************************************************************/
  10
  11 #ifndef __I2C_PORT_H__
  12 #define __I2C_PORT_H__
  13
  14 #include "Radeon.h"
  15
  16 enum i2c_port_clock_rate {
  17         C_RADEON_I2C_MIN_CLOCK_RATE             = 7500,
  18         C_RADEON_I2C_MAX_CLOCK_RATE             = 100000,
  19         C_RADEON_I2C_DEFAULT_CLOCK_RATE = 80000
  20 };
  21
  22 class CI2CPort {
  23 public:
  24         CI2CPort(CRadeon & radeon, int rate = C_RADEON_I2C_DEFAULT_CLOCK_RATE);
  25
  26         ~CI2CPort();
  27
  28         status_t InitCheck() const;
  29
  30         CRadeon & Radeon() const;
  31
  32         bool Probe(int address);
  33
  34 public:
  35         bool Write(int address, const char * buffer, int length);
  36
  37         bool Read(int address, char * buffer, int length);
  38
  39         bool Write(int address, const char * buffer, int length, char * output, int outlen);
  40
  41 public:
  42         int Register(int address, int index);
  43
  44         void SetRegister(int address, int index, int value);
  45
  46 private:
  47         int Send(int address, const char * buffer, int length, bool start, bool stop);
  48
  49         int Receive(int address, char * buffer, int length, bool start, bool stop);
  50
  51         int WaitAck();
  52
  53         void Stop();
  54
  55 private:
  56         CRadeon & fRadeon;
  57         int fNfactor;
  58         int fMfactor;
  59         int fTimeLimit;
  60         shared_info* si;
  61 };
  62
  63
  64 #endif