常用代码集

1. debug

 #define dbg(fmt,arg...) printf("function:%s line:%d "fmt,__FUNCTION__,__LINE__,##arg)

2. i2c 驱动注册

 #define DEV_NAME "name"
 #define DEV_ADDR (xx)

#define I2C_BUS_D (x)

static struct i2c_driver pn544_driver = {
.id_table   = pn544_id,
.probe      = pn544_probe,
.remove     = pn544_remove,
.shutdown   = pn544_shutdown,
 .driver     = {
.owner  = THIS_MODULE,
.name   = DEV_NAME ,
},
};

static int __init pdev_init(void)
 {
     struct i2c_board_info board_info;
     struct i2c_adapter *adapter;
     struct i2c_client *i2c_client;
 
     adapter = i2c_get_adapterI2C_BUS_D);
     if (!adapter) {
         pr_info("warnning£ºfail get adapter!\n");
         return 0;

    }

    platform_data pdata = kzalloc(sizeof(struct platform_data), GFP_KERNEL);

    memset(&board_info, 0, sizeof(board_info));
    strncpy(board_info.type, DEV_NAME, I2C_NAME_SIZE);
    board_info.addr = DEV_ADDR;
     board_info.platform_data = (pdata);
     pr_info("%s: adapter = %p\n", DEV_NAME, adapter);
     i2c_client = i2c_new_device(adapter, &board_info);

    return i2c_add_driver(&driver);

}