fjbtndrv is an out of tree kernel driver for Fujitsu PC's tablets. [rhl] is interested in getting them in tree:
Maintainer Robert Gerlach hosts the code here: http://sourceforge.net/projects/fjbtndrv/
To compile you will need:
./configure; make; sudo make install
in src/linux there is fsc_btns.ko, you need to load this module,
and start fscrotd, and fscd, the userland daemons.
To run you will need: