Command in Kernel-Space

Hello im Wrinting some Applications to control a X-Ray-Camera.

Because of that I have to use some realtime-stuff.
So I want to execute a commedi_command in kernel_space!
But I got a problem! First I don't get known of if the
command is really executed and furthermore
I don't know how to read the data from the device, because
read doesn't word in kernel_space. So I have so use something like
the "memcpy" commands. But if I try, all the header files i have to include
produces compile errors over and over! 
(e.g. if I include comedidev.h)
Has someone done something like that?

Greetings

Patrick