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      struct module *owner; -set to the value (THIS_MODULE) that allows the proper module reference counting.
      unsigned int class; -the type of I2C class devices that this driver supports. Usually this is set to the value I2C_ADAP_CLASS_SMBUS.
      struct i2c_algorithm *algo; -a pointer to the struct i2c_algorithm structure that describes the way data is transferred through this I2C bus controller. More information on this structure is provided below.
      char name[I2C_NAME_SIZE]; -set to a descriptive name of the I2C bus driver. This value shows up in the sysfs filename associated with this I2C adapter.
ÒÔϵĴúÂëÀ´×ÔÒ»¸öI2C adapterÇý¶¯µÄÀý×Ótiny_i2c_adap.c£¬
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À´¿´¿´struct i2c_adapter ÈçºÎ±»ÉèÖãº
static struct i2c_adapter tiny_adapter = {
   .owner  = THIS_MODULE,
   .class  = I2C_ADAP_CLASS_SMBUS,
   .algo   = &tiny_algorithm,
   .name   = "tiny adapter",
};
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