Signal strength threshold for hardware seek

Hi,

I'm writing a V4L2 driver for the RDA5807 FM receiver chip. This chip has hardware seek capability where it will search for a frequency on which the signal level is above a configurable threshold. I am wondering what would be the best way to configure that threshold in the driver:

a. Use a fixed hardcoded value?
b. Use a fixed value specified in the platform data? c. Use a fixed value specified as a module parameter? d. Add a control for it? (a CID would have to be added) e. Add a field for it in struct v4l2_hw_freq_seek?

Since I'm pretty new at V4L2 and options d and e would introduce new interface elements, I could use some guidance.

If anyone is interested, the work in progress can be found here:

http://projects.qi-hardware.com/index.php/p/qi-kernel/source/tree/
jz-3.0/drivers/media/radio/radio-rda5807.c

It has sufficient functionality to support playback and scanning using fmtools 2.0.1, but it needs more functionality and some cleanup before I can submit it for inclusion in the mainline kernel.

Bye,
Maarten