PCI_REVISION
pci_read_config_byte(pdev, PCI_REVISION, &hw->revision_id);
pcibios_read_config_dword(bus, devfn, PCI_REVISION, &l);
pcibios_read_config_byte(pci->bus,pci->devfn, PCI_REVISION, &revision);
pcibios_read_config_byte(pci->bus, pci->devfn, PCI_REVISION, &chip_rev);