Driver Stack Load Order

Hi,

I am also making USB driver for our USB keyboard which send scan codes in
our specific format. But I am not able to fetch the proper devicedescriptor
from USB keyboard. On analyzing further, we found that our driver was not on
top of USB Bus Driver and all USBD*() calls were failing.

What is the procedure to insert our driver on top of USB Bus Driver so that
USBD*() calls can succeed?

Thanks
Ashish