pci_get_powerstate
.get_powerstate = pci_get_powerstate,
status_t pci_get_powerstate(uchar virtualBus, uint8 device,
int pci_get_powerstate(device_t dev);
if (pci_get_powerstate(dev) != PCI_POWERSTATE_D0)
oldPowerState = pci_get_powerstate(dev);