Analog TV out for s5pv210 under linux

nasix
Hi every body

I'm working on s5pv210 analog TV-out on Linux. I can see the related
drivers in the kernel source code. (drivers/media/video/samsung/tv20/) But
I'm not sure if they have been tested and work properly. I studied the
source codes and here are some points:
It seems that the write() function does noting and can not be used to
directly produce some patterns on the screen. Also, VIDIOC_S_FMT ioctl
needs the address of the place it can find the images to display. But
actually I can't figure out how to make it work and where to find the
address of fb to pass and so forth.
I also found a tv_test application (user-space) source code for doing
something similar for mini6410. But s3c6410 kernel side is different to
that of s5pv210.

Have anybody succeeded to use the TV-enc of s5pv210 under Linux? 
And is there any useful resource, starting point, source code or any
related material to work with?

Any help would greatly be appreciated.