How to install max310x driver for RasPi 3.12.26+

gistfile1.sh

# modify Kconfig to change to tristate

# make driver
sudo make prepare
sudo make modules_prepare KERNELRELEASE=$(uname -r)
sudo make SUBDIRS=drivers/tty/serial modules
sudo make SUBDIRS=drivers/tty/serial modules_install
sudo mv /lib/modules/3.12.26/extra/* /lib/modules/3.12.26+/extra/
sudo rm -r /lib/modules/3.12.26
sudo depmod

# install driver
sudo modprobe max310x
sudo modprobe spi-config devices=bus=0:cs=0:modalias=max14830:speed=10000000:irq=0:force_release

# check gpio
cd /sys/class/gpio
echo 242 > export
echo out > gpio242/direction
for i in `seq 1 100`; do echo $(expr $i % 2) > gpio242/value && sleep 0.2; done

# check uart
sudo minicom -s
# /dev/ttyMAX0 Hardware/Software flow control: Off

# shutdown
sudo rmmod max310x
sudo rmmod spi-config