USB_POWER_INFO structure (usbuser.h)
The USB_POWER_INFO structure is used with the IOCTL_USB_USER_REQUEST I/O control request to retrieve device power state that the host controller power policy specifies for the indicated system power state.
Syntax
typedef struct _USB_POWER_INFO {
WDMUSB_POWER_STATE SystemState;
WDMUSB_POWER_STATE HcDevicePowerState;
WDMUSB_POWER_STATE HcDeviceWake;
WDMUSB_POWER_STATE HcSystemWake;
WDMUSB_POWER_STATE RhDevicePowerState;
WDMUSB_POWER_STATE RhDeviceWake;
WDMUSB_POWER_STATE RhSystemWake;
WDMUSB_POWER_STATE LastSystemSleepState;
BOOLEAN CanWakeup;
BOOLEAN IsPowered;
} USB_POWER_INFO, *PUSB_POWER_INFO;
Members
SystemState
On input, a WDMUSB_POWER_STATE-type enumerator value that specifies the system power state.
HcDevicePowerState
On output, an WDMUSB_POWER_STATE-type enumerator value that specifies the device power state of the host controller.
HcDeviceWake
On output, a WDMUSB_POWER_STATE-type enumerator value that specifies whether the host controller is in a wake state.
HcSystemWake
On output, a WDMUSB_POWER_STATE-type enumerator value that specifies whether the host controller can wake the system.
RhDevicePowerState
On output, a WDMUSB_POWER_STATE-type enumerator value that specifies the device power state of the root hub.
RhDeviceWake
On output, a WDMUSB_POWER_STATE-type enumerator value that specifies whether the root hub is in a wake state.
RhSystemWake
On output, a WDMUSB_POWER_STATE-type enumerator value that specifies whether the root hub can wake the system.
LastSystemSleepState
On output, a WDMUSB_POWER_STATE-type enumerator value that specifies the last system sleep state.
CanWakeup
A Boolean value that indicates whether the host controller device can wake up the system from the specified system power state. If TRUE, the host controller device can wake up the system. If FALSE, the host controller cannot wake up the system.
IsPowered
A Boolean value that indicates whether the host controller is powered when in the specified system power state. If TRUE, the host controller is powered. If FALSE, the host controller is not powered.
Remarks
The USB_POWER_INFO structure is used with the USBUSER_GET_POWER_STATE_MAP user-mode request. For more information about this request, see IOCTL_USB_USER_REQUEST.
Requirements
| Requirement | Value |
|---|---|
| Header | usbuser.h (include Usbuser.h) |