谈到在linux 系统下编写 I2C 驱动，目前主要有两种方式，一种是把I2C 设备当作一个普通的字符设备来处理，另一种是利用 linux I2C 驱动体系结构来完成。下面比较下这两种驱动。-Speaking at the linux system to prepare I2C driver, there are mainly two ways, one is to I2C devices as an ordinary character device to handle, and the other is the use of linux I2C driven architecture to complete. Compare the following two drive under.