Official PS3 Controller Keyboard as input device to PC
Solution 1:
It would need a custom driver. Here is the one for the SIXAXIS game pad, however there are issues with unsigned drivers like having to select the 'use unsigned drivers' option from boot up. http://news.filefront.com/how-to-use-a-ps3-controller-on-a-pc/
Sony seems to have issues with using their hardware on other systems so you wont ever find a legit driver.