how to handle fb_ioctl

Hi all,

sorry, here comes an additional question about the fb framework:
I'm confused about the fb_ioctl entry in the fb_ops structure. When I want to 
add my own driver specific IOCTLs, how to do it? If I setup my own function 
into the fb_ioctl entry, does it _add_ my IOCTLs to the existing ones or does 
it replace framework's IOCTLs (so my function must also handle the existing 
ones)? Or does the framework calls my private IOCTL handler via fb_ioctl if 
an unknown IOCTL enters the existing IOCTL handler?

Thanks in advance.
Juergen

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