I have not used a Pinnacle TV card, however
this page on the V4L wiki looks like certain Pinnacle cards can be used.
See the output of "dmesg" and "lspci" to see if your card is being detected. This should tell you the type pf chip that is used, and (hopefully) you can get drivers for it.
It appears that most of the Pinnacle cards use the SAA713x chip, which should be supported. See
this page to see if your card is listed.
--Ian