Before check if you have the same webcam than me with lsusb :
#lsusb |grep 05ca
Bus 005 Device 005: ID 05ca:1830 Ricoh Co., Ltd

N.B : 1832,1834 and 1870 version could work too, see the website of Sam Revitch

Download the Ricoh R5U870 module that you can find on the website of Sam Revitch. Uncompress it and compil it :
# cd folder-ricoh/
#./configure
#make
#make install
reboot and enjoy (or if you want test it now : #modprobe ry5u870 )


Now you can test your webcam with Ekiga or amsn, the microphone works too :)

N.B. : if it doesn't compil, you 'll have to add some package with synaptic. Read errors and try to add the good packages, there is a solution:).
If you're trying to update your driver with a new version, don't forget to remove your old driver :
#updatedb
#locate ry5u870
...
#rm /lib/modules/2.6.x.x-generic/kernel/drivers/media/video/ry5u870.ko



This is a motion software detector, download it there or on the official website.
Install packages :
libmysqlclient
libq5, libq5-dev
libavcodec-dev
libavformat-dev
# cd folder-motion/
# ./configure -----> try to have all yes
#make
#make install
#cp /usr/local/etc/motion-dist.conf /usr/local/etc/motion.conf
Try it now and enjoy :)
#motion


N.B. : if it doesn't compil, you'll have to add some package with synaptic. Read errors and try to add the good packages, there is a solution:)