基于linux2.6.12和s3c2440的按键驱动，控制6个按键，有阻塞和非阻塞两种方式读-S3c2440 based linux2.6.12 and the key driver to control the six buttons, with blocking and nonblocking read in two ways

嵌入式linux按键驱动，支持阻塞和非阻塞读写，可以帮助入门linxu驱动-The embedded linux key driver to support blocking and nonblocking read and write, you can help the the entry linxu drive