Provided by: linux-doc-2.6.15_2.6.15-23.39_all bug

NAME
       pci_bus_find_capability - query for devices’ capabilities


SYNOPSIS
       int pci_bus_find_capability  (struct pci_bus * bus, unsigned int devfn,
                                      int cap);


ARGUMENTS
       bus    the PCI bus to query

       devfn  PCI device to query

       cap    capability code


DESCRIPTION
       Like pci_find_capability but works for pci devices that do not  have  a
       pci_dev structure set up yet.

       Returns  the  address  of the requested capability structure within the
       device’s PCI configuration space or 0  in  case  the  device  does  not
       support it.