The information contained here is likely non-exhaustive and, despite best efforts to do otherwise, may contain errors. (Please help to keep these lists up-to-date so that they are useful for everyone!)
If your device is not listed, try:
searching the existing mailing list archives:
Linux-Media Mailing List (LMML) archives (via vger or .... )
or from the older mailing lists (now largely deprecated in favour of the LMML):
searching for information with Google or other internet search engine
by posting a question about the device directly to the LMML (but please do conduct a search first, as it may already have been discussed!)
Note: when it comes to support, it is generally a good idea to try the current V4L-DVB sources because some device drivers can be very new and thus may have not made their way into the mainstream kernel.
In any regard, in respect to the above listed suggestions, you may find it to be the case that your device is actually already supported or that experimental support is available.
Because the component constitution on many devices are often similar or identical, there may be devices that are unlisted but may actually work with the existing driver framework for previously supported devices. In such a case, your non-listed but working device will likely be reported in your system messages as being one of those previously supported devices. If you encounter such an occurrence, please do report your success on the LMML so that proper detection/identification of your device can be added within the drivers.
Lastly, it bears worth repeating the request: Please help to keep these lists up-to-date so that they are useful for everyone!