关于i2c驱动的问题

[jichangchun2011]

在linux2.6.28内核中的include/linux/i2c.h中有这样的一个结构体：struct i2c_client_address_data {
const unsigned short *normal_i2c;
const unsigned short *probe;
const unsigned short *ignore;
const unsigned short * const *forces;
};

可是在内核2.6.38中没有了？问下38中是怎样处理i2c操作的？用什么来代替这个结构体了？

[jichangchun2011]

那位大侠帮忙说下呀！

[jichangchun2011]

怎么2.6.38内核里，连int (*client_register)(struct i2c_client *);//注册时调用
int (*client_unregister)(struct i2c_client *);//注销时调用
这两个结构体都没了！

[ma100]

下面是我写 的应用程序, 驱动我不会
I2C.h和I2C.cpp

#include "StdAfx.h"

class CI2C //I2C接口设备的底层程序,包括键盘,温度控制器
{
private:
	CI2C ( void ){}
	~CI2C ( void ){}
	static CI2C m_Instance;
	//CI2C &operator=(CI2C&);  //disallowed 
	//CI2C ( const CI2C& );    //disallowed
public:
	static CI2C &GetInstance ( void ) { return m_Instance; }
	void Initial ( void );
	void Cleanup ( void );

	int GetTmp ( void );
	int GetLastKey ( void );

private:
	void ReadI2C ( UCHAR device_addr, UCHAR reg_addr, int read_len, UCHAR *out_buf );
	void WriteI2C ( USHORT device_addr, UCHAR reg_addr, UCHAR data );


	struct i2c_msg
	{
		USHORT addr;  //从设备地址
		USHORT flags; //1:读,0:写
	 
		USHORT len;   //数据长度
		UCHAR *buf;   //数据
	};

	struct i2c_rdwr_ioctl_data
	{
		i2c_msg *msgs; // 
		int nmsgs; //nmsgs这个数量决定了有多少开始信号，对于“单开始时序”，取1

	};  
	int m_nfd; //设备节点 /dev/i2c-1
	CLock m_Lock; //互斥锁,包含不能同时读写I2C
};

namespace i2c_namespace
{
	//common
	const int I2C_RETRIES = 0x0701;
	const int I2C_TIMEOUT = 0x0702;
	const int I2C_RDWR    = 0x0707; 
	const int MAX_MSG_NUM = 2; //一次连续可以发多少条消息
	const int MAX_BUF_NUM = 2; //每条消息最多带几个数据

	//key
	const int ADDR_KEY = 0x34;

	//temperature
	const int ADDR_TMP     = 0x4f;
}
 

extern CI2C &g_I2C;


/////////////////////////I2C.cpp///////////////////////
#include "I2C.h"

using namespace i2c_namespace;

CI2C CI2C::m_Instance;
CI2C &g_I2C = CI2C::GetInstance();

/*/////////////////////////////////////////////////////////////////////////////
  Function:       Initial 
  Description:    初始化I2C和互斥锁
  Calls:          ---
  Called By:      ---
  Input:          ---
  Output:         ---
  Return:         ---
  Others:         public
/////////////////////////////////////////////////////////////////////////////*/ 
void CI2C::Initial ( void )
{
	m_nfd = open("/dev/i2c-1",O_RDWR);
	ioctl(m_nfd,I2C_TIMEOUT,1);/*超时时间*/
	ioctl(m_nfd,I2C_RETRIES,2);/*重复次数*/
	
	//key:
	WriteI2C ( ADDR_KEY, 0x01, 0x2d );
	WriteI2C ( ADDR_KEY, 0x1d, 0x3f );
	WriteI2C ( ADDR_KEY, 0x1e, 0x3f );
	WriteI2C ( ADDR_KEY, 0x1f, 0x00 );
	WriteI2C ( ADDR_KEY, 0x23, 0xc0 );
	WriteI2C ( ADDR_KEY, 0x24, 0xc0 );
	WriteI2C ( ADDR_KEY, 0x25, 0x03 );

	//temperature
	WriteI2C ( ADDR_TMP, 0x01, 0x60 );

	m_Lock.Initialize();
}

/*/////////////////////////////////////////////////////////////////////////////
  Function:       Cleanup 
  Description:    数据清理
  Calls:          ---
  Called By:      ---
  Input:          ---
  Output:         ---
  Return:         ---
  Others:         public
/////////////////////////////////////////////////////////////////////////////*/ 
void CI2C::Cleanup ( void )
{
	m_Lock.Destroy();
	close ( m_nfd );
}

/*/////////////////////////////////////////////////////////////////////////////
  Function:       GetTmp 
  Description:    取得温度(摄氏度)
  Calls:          ---
  Called By:      ---
  Input:          ---
  Output:         ---
  Return:         温度
  Others:         public
/////////////////////////////////////////////////////////////////////////////*/ 
int CI2C::GetTmp ( void )
{
	UCHAR buf[2];

	ReadI2C ( ADDR_TMP, 0, 2, buf );

	return (  ( ( ( buf[0] << 8 ) | buf[1] )  & 0xffff) >> 8 );
}

/*/////////////////////////////////////////////////////////////////////////////
  Function:       GetLastKey 
  Description:    取得键值
  Calls:          ---
  Called By:      ---
  Input:          ---
  Output:         ---
  Return:         键值
  Others:         public
/////////////////////////////////////////////////////////////////////////////*/ 
int CI2C::GetLastKey ( void )
{  
	int data;
	UCHAR buf[1];

	ReadI2C ( ADDR_KEY, 0x03, 1, buf );
	data = ( buf[0] & 0xff); //缓存的个数
	
	for ( int i = 0 ; i < data ; i++ )
	{
		ReadI2C ( ADDR_KEY, 0x04, 1, buf );
	}

	data = ( buf[0]& 0xff);
	
	return data ;
}

/*/////////////////////////////////////////////////////////////////////////////
  Function:       WriteI2C 
  Description:    写I2C设备
  Calls:          ---
  Called By:      ---
  Input:          device_addr: 设备地址
                  reg_addr: 寄存器地址
				  data: 要写的数据
  Output:         ---
  Return:         键值
  Others:         private
/////////////////////////////////////////////////////////////////////////////*/ 
void CI2C::WriteI2C ( USHORT device_addr, UCHAR reg_addr, UCHAR data )
{
	m_Lock.Enter();
	i2c_rdwr_ioctl_data msgbuf;

	msgbuf.nmsgs = 1;
	msgbuf.msgs = new i2c_msg[msgbuf.nmsgs];
	msgbuf.msgs[0].len = 2;
	msgbuf.msgs[0].flags=0;//write
	msgbuf.msgs[0].addr=device_addr;
	msgbuf.msgs[0].buf = new UCHAR[2];
	msgbuf.msgs[0].buf[0]=reg_addr;//  写入目标的地址
	msgbuf.msgs[0].buf[1]=data;//  写入目标的地址
		
	ioctl(m_nfd,I2C_RDWR, &msgbuf);
	
	delete [] msgbuf.msgs[0].buf;
	delete [] msgbuf.msgs;
	m_Lock.Leave();
} 

/*/////////////////////////////////////////////////////////////////////////////
  Function:       ReadI2C 
  Description:    读I2C设备
  Calls:          ---
  Called By:      ---
  Input:          device_addr: 设备地址
                  reg_addr: 寄存器地址
				  read_len:数据长度
  Output:         out_buf:数据
  Return:         ---
  Others:         private
/////////////////////////////////////////////////////////////////////////////*/ 
void CI2C::ReadI2C ( UCHAR device_addr, UCHAR reg_addr, int read_len, UCHAR *out_buf )
{
	m_Lock.Enter();

	int i;
	i2c_rdwr_ioctl_data msgbuf;

	msgbuf.nmsgs=2;
	msgbuf.msgs = new i2c_msg[msgbuf.nmsgs];
	msgbuf.msgs[0].len=1; // 目标数据的地址
	msgbuf.msgs[0].addr=device_addr; //  设备地址
	msgbuf.msgs[0].flags=0;//write
	msgbuf.msgs[0].buf = new UCHAR[1];
	msgbuf.msgs[0].buf[0]=reg_addr;//数据地址

	msgbuf.msgs[1].len= read_len;//读出的数据
	msgbuf.msgs[1].addr=device_addr;//  设备地址 
	msgbuf.msgs[1].flags = 1;//read
	msgbuf.msgs[1].buf = new UCHAR[read_len];
 
	ioctl( m_nfd, I2C_RDWR, &msgbuf );

	for ( i = 0 ; i < read_len ; i++ )
		out_buf[i] = msgbuf.msgs[1].buf[i];

	delete [] msgbuf.msgs[0].buf;
	delete [] msgbuf.msgs[1].buf;
	delete [] msgbuf.msgs;
	m_Lock.Leave();
}

[xxw19840406]

LS的代码不是Linux的吧

[ma100]

linux 就不能写c++ 吗

[steven_miao]

还没有看38的内核，lz还是看一个38 I2C驱动示例就行了，其本质和28的应该没有什么区别！

[jichangchun2011]

LS哪有38内核的驱动实例，有链接帮忙弄一个呗？