Mp3Car.com has designed a USB interface for the Immersion TouchSense PR-1000 programmable rotary encoder. This encoder has a lot of potential to improve car computing safety and the user experience. It is electromechanical controlled so that it can provide various sensations such as detents, stops, hills, and varying levels of friction or force enabling users to "feel" their way around car computer applications.

This is the driver that you will need first of all:
http://www.mp3car.com/products/PR-1000/Mp3Car_haptic_encoder_driver.zip

That will install both a VCP and a DLL interface.

This is an example program showing the DLL interface with the source:
http://www.mp3car.com/products/PR-1000/PR-1000_DLL_Interface.zip

Unofficial Protocol Document here:
http://ofb.net/~egnor/pr1000.html

Unofficial Protocol Discussion here:
http://www.mp3car.com/vbulletin/mp3car-products-store-mp3car-com/131018-unofficial-touchsense-page-ranking-1000-protocol-description.htm