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-------------------------------------------------------------------------------
Readme for Linux device driver for the OmniVision OV511 USB to camera bridge IC
-------------------------------------------------------------------------------
INTRODUCTION:
This is a preliminary version of my OV511 Linux device driver. At the moment,
it does not do much more than detect the chip and initialize it. As trivial
as this sounds, it represents many hours of my work. Since OmniVision refused
to release the full specs to me, I had to write code to probe out the register
read/write commands. Some code is in place to allow a frame to be grabbed, but
it is nowhere near complete.
SUPPORTED CAMERAS:
____________________________________________
Manufacturer | Model | Custom ID
-----------------+--------------+-----------
D-Link | DSB-C300 | 3
Creative Labs | WebCam 3 | 21
--------------------------------------------
Any camera using the OV511 and the OV7610 CCD should work with this driver. The
driver only detects known cameras though, based on their custom id number. If
you have a currently unsupported camera, the ID number should be reported to you
in the kernel logs. If you have an unsupported camera, please send me the model,
manufacturer and ID number and I will add it to the detection code. In the
meantime, you can add to the code yourself in the function ov511_probe()
WHAT YOU NEED:
- If you want to help with the development, get the chip's specification docs at
http://www.ovt.com/omniusbp.html
- A Video4Linux compatible frame grabber program (I recommend vidcat)
(see: http://www.exploits.org/v4l/ )
WHAT NEEDS TO BE DONE:
In short, a lot.
UPDATE:
Currently, the control messages are working fine ("vendor commands"; for
reading and writing the OV511 registers.) The I2C bus commands for reading and
writing the camera (OV7610) registers are implemented and working, with at least
one person's camera. The isochronous-in endpoint for video data is finally
producing data, but since ov511_parse_data() is not implemented you will not see
a picture yet.
Support for specific CCD's will have to be implemented as well (such as the
OV7610.)
The rest of the work will involve implementing support for all the different
resolutions, color depths, etc. Also, while support for the OV511's proprietary
lossy compression is apparently not necessary (the code currently disables it,)
it would be a nice addition as it improves performance quite a bit. OmniVision
wouldn't tell me how the algorithm works, so we can't really work on that yet.
Please kindly inform OmniVision that you would like them to release their
specifications to the Linux community.
HOW TO CONTACT ME:
You can email me at mmcclelland@delphi.com . Please prefix the subject line
with "OV511: " so that I am certain to notice your message.
CREDITS:
The code is based in no small part on the CPiA driver by Johannes Erdfelt,
Randy Dunlap, and others. Big thanks to them for their pioneering work on that
and the USB stack. Thanks to Bret Wallach for getting camera reg IO and ISOC
working.
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