support SPI bus connection

modulename: ad7879-spi.ko

configname: CONFIG_TOUCHSCREEN_AD7879_SPI

Linux Kernel Configuration
└─>Device Drivers
└─>Input device support
└─>Touchscreens
└─>support SPI bus connection
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
Say Y here if you have AD7879-1/AD7889-1 hooked to a SPI bus.

If unsure, say N (but it's safe to say "Y").

To compile this driver as a module, choose M here: the
module will be called ad7879-spi.

source code: