After quite some time of talking about it, we finally got around to getting the analog support for the HVR-1850 submitted upstream. Support for all things analog is present and tested on all the various input types: the MPEG encoder, raw capture, analog audio. This patch series also includes a fix for a long-standing regression in the HVR-1800 as well.
Users are free to try it building from the above git tree, or they can wait a few days for it to be merged into the upstream linux-media tree.
The HVR-1850 is a really nice card (effectively the PCIe equivalent to the HVR-1600 that is already a popular choice with the MythTV crowd), and we will be happy to see the card fully supported in the mainline kernel.