pci_set_power_state (9) - Linux Man Pages
pci_set_power_state: Set the power state of a PCI device
pci_set_power_state - Set the power state of a PCI device
int pci_set_power_state(struct pci_dev
*dev, pci_power_t state);
- PCI device to handle.
- PCI power state (D0, D1, D2, D3hot) to put the device into.
Transition a device to a new power state, using the platform firmware and/or the device's PCI PM registers.
RETURN VALUE: -EINVAL if the requested state is invalid. -EIO if device does not support PCI PM or its PM capabilities register has a wrong version, or device doesn't support the requested state. 0 if device already is in the requested state. 0 if device's power state has been successfully changed.