Where does m.offset point to?

[Joshua Lamorie <jpl@xxxxxxxxx>]

Gidday there,

I'm building a Video4Linux driver for some proprietary hardware 
(interface to a CMOS sensor).

My initial driver was only doing read/write access, and now I want to 
get the memory mapped stuff going.

I have been looking at the example stuff in video-buf.[ch] but it seems 
to do a bit more than I need.  I don't have PCI, I'm not doing DMA and 
the driver stores the frames in system memory (as opposed to in the device).

I'm a little confused about what to do for v4l2_buffer.m.offset while 
responding to VIDIOC_REQBUFS.

I have my buffers each allocated as
pxBufList[i] =  (struct v4l2_buffer 
*)kmalloc(iPageAlignedBufSize,GFP_KERNEL)

but I'm not sure what to do with
pxBufList[i].m.offset

As far as I understand, I need to have this set to something so that 
when the application does VIDIOC_QUERYBUF m.offset has something useful 
to pass to mmap.

Any hints to a simpler implementation of this?

Thanks

Joshua

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