[Q] camera test pattern as an alternative input?

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In a currently running mt9m111 thread we're discussing ways to activate 
one of camera's (sensor's) test patterns. A module parameter has been 
proposed, earlier this has been done by just using the infamous 
VIDIOC_DBG_S_REGISTER. But then it occurred to me, that there has been 
previously such a discussion and it has been proposed to assign 
alternative inputs to various test patterns. So, you just issue a 
VIDIOC_S_INPUT to switch between the actual video input and one of test 
patterns. Can anyone else remember such a discussion or maybe just knows 
examples of such drivers? A couple of grep attempts haven't revealed 
anything. Is this a good idea?

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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