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Probing PCI device..

      I have a analog data acquisition Card based on PCI. I want to write
a driver for the same on Linux. I have some knowledge of it's working and
also it's register details are with me. But while trying to probe it I am
unable to sort out that, to which class I should put it in. This is
required as one of the argument to pci_find_class asks the class of the
card. I know the vendorid and deviceid by the help of which I may try to
probe it(this too I haven't tried yet), but if I want to probe it by it's
class argument then to which class does it belong. I tried to find out
from pci.h header file but could not settle down for a class. If somebody
has done some similar work then I would like to seek his/her help for the
Also is there any other way to probe the PCI devices. I found a lot of
functions in pci.h but it asks some input argument of type 'struct pci_dev
*' to start somewhere and following this link the code will find out other
pci devices i.e. if I want to probe all the PCI devives then what argument
should I pass to the function pci_find_class or other probing functions so
that I can find out all the PCI devices starting from the very first
device in the linked list.

Also I am unable to do the probing work in user mode as there are no
supporting libraries for the same. All the libraries for probing PCI
devices are part of the linux kernel. So, is it possible to do so in user
mode, if yes how? Related links will be of great help where I can found
some detailed stuff.