自己写的一个小小的I2C驱动

编译选择2410 的ADAPTER , 自己写了个I2C驱动的小程序， 代码风格比较难看，只是用来自己看看。

#include
#include
#include
#include
#include
#include         /* get the user-level API */
#include
#include

static unsigned short normal_i2c[] = { 0x50, I2C_CLIENT_END };

I2C_CLIENT_INSMOD_1(at24);

static struct i2c_client new_client;
/*
static ssize_t si2c_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
{


}

static ssize_t i2c_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
{


}

static DEVICE_ATTR(AT24,S_IRUGO,i2c_show,i2c_store);
*/
static int write_i2c(void)
{
    int ret;
    char buf[5]={0,1,2,3,4};
    ret = i2c_master_send(&new_client,buf,4);
    return ret;
}

static int read_i2c(void)
{
    int ret;
    char buf1[4]={0};
    char temp[1]={0};
/*或者直接使用  i2c_transfer(adap, &msg, 2) 传递2个消息;*/
    i2c_master_send(&new_client,temp,1);   //读需要两次操作，第一次为写inner reg.
    ret=i2c_master_recv(&new_client,buf1,4);
    int i;
    for (i=0;i<4;i++)
        printk("buf1[%d]=%d,",i,buf1[i]);
    return ret;
}

static int at24_detect(struct i2c_adapter *adapter, int address, int kind)
{
    printk("detect 24 i2c,address=%d\n",address);
    new_client.adapter=adapter;
    new_client.addr=address;
    write_i2c();
    msleep(1000);
    read_i2c();
    return 0;
}

static int at24_adatper(struct i2c_adapter *adapter)
{
    return i2c_probe(adapter, &addr_data, at24_detect);
}


static struct i2c_driver at24_driver={
    .driver={
        .name="at24",
    },
    .attach_adapter=at24_adatper,


};

static int at24_init(void)
{
 return i2c_add_driver(&at24_driver);
}

static void at24_exit(void)
{
    i2c_del_driver(&at24_driver);

}
module_init(at24_init);
module_exit(at24_exit);