在内核里写i2c设备驱动的两种方式前文介绍了利用/dev/i2c-0在应用层完成对i2c设备的操作，但很多时候我们还是习惯为i2c设备在内核层编写驱动程序-Written in the kernel device driver i2c two ways previously described the use/dev/i2c-0 in the application layer on the i2c device to complete the operation, but many times we used to write i2c device driver in the kernel layer