Man page 9 : __pci_enable_wake

__pci_enable_wake - enable PCI device as wakeup event source

int __pci_enable_wake(struct pci_dev *  dev , pci_power_t  state , bool  runtime , bool  enable );

dev
    PCI device affected

state
    PCI state from which device will issue wakeup events

runtime
    True if the events are to be generated at run time

enable
    True to enable event generation; false to disable

This enables the device as a wakeup event source, or disables it. When such events involves platform-specific hooks, those hooks are called automatically by this routine.

Devices with legacy power management (no standard PCI PM capabilities) always require such platform hooks.

0 is returned on success -EINVAL is returned if device is not supposed to wake up the system Error code depending on the platform is returned if both the platform and the native mechanism fail to enable the generation of wake-up events