pci_bus_find_capability — query for devices' capabilities
int pci_bus_find_capability ( | struct pci_bus * bus, |
| unsigned int devfn, | |
int cap); |
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.