原创的使用PCA9535芯片作为键盘输入设备的Linux驱动程序，在Blackfin BF548和Freescale MCF54455两种平台下测试过。-PCA9535 chip original use as a keyboard input device of the Linux driver, and tested under the Blackfin BF548 at Freescale MCF54455.

使用PCA9535芯片作数字输入／输出端口的驱动程序，支持异步通知功能。-PCA9535 chips used for digital I/O port drivers, support for asynchronous notifications.

PCA9535 io expander code