说明：  S3C2440外设SPI1接口驱动程序模块，在linux2.6.32内核上运行通过，加载该模块后会在/dev/下生成一个SPI1字符设备文件，源内核有SPI子系统，不过太复杂，没去研究，所以就自己写了，绝对是原创，适合初学者参考。
(S3C2440 SPI1 peripheral interface driver module, run by the linux2.6.32 kernel, load the module in the/dev/SPI1 generate a character device file, the source kernel with SPI subsystem, but is too complicated, not to study , so I wrote my own, suitable for beginners reference.)