support SPI bus connection

modulename: ad714x-spi.ko

configname: CONFIG_INPUT_AD714X_SPI

Linux Kernel Configuration
└─>Device Drivers
└─>Input device support
└─>Miscellaneous devices
└─>support SPI bus connection
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
Say Y here if you have AD7142/AD7147 hooked to a SPI bus.

To compile this driver as a module, choose M here: the
module will be called ad714x-spi.

source code: