PCI_EXP_DPC_CAP
pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CAP, &cap);
pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CAP, &cap);
pci_read_config_word(dev, pos + PCI_EXP_DPC_CAP,
pci_read_config_word(dev, dpc + PCI_EXP_DPC_CAP, &val);