Original:  http://www.tortosaforum.com/raspberrypi/dht11km.tar
Reference: http://0975128810.blogspot.tw/2016/01/dht11-on-raspberry.html

Usage:
$ make
$ sudo mknod /dev/dht11 c 80 0
$ sudo insmod ./dht11km.ko gpio_pin=18 format=3

Result:
$ cat /dev/dht11
Humidity: 73%
Temperature: 29%
Result:OK

