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PEP_DEVICE_PLATFORM_CONSTRAINTS structure (pepfx.h)

  • Article

The PEP_DEVICE_PLATFORM_CONSTRAINTS structure specifies the constraints for entry to the various Dx power states that are supported by a device.

Syntax

typedef struct _PEP_DEVICE_PLATFORM_CONSTRAINTS {
  [in] PEPHANDLE           DeviceHandle;
  [in] PDEVICE_POWER_STATE MinimumDStates;
  [in] ULONG               PlatformStateCount;
} PEP_DEVICE_PLATFORM_CONSTRAINTS, *PPEP_DEVICE_PLATFORM_CONSTRAINTS;

Members

[in] DeviceHandle

A PEPHANDLE value that identifies the device. The PEP supplied this handle in response to a previous PEP_DPM_REGISTER_DEVICE notification.

[in] MinimumDStates

A pointer to an array of DEVICE_POWER_STATE enumeration values that indicate the lowest-powered Dx (device power) state the device can enter for each platform idle state.

[in] PlatformStateCount

The number of elements in the array pointed to by the MinimumDStates member. This member contains the platform state count that the PEP supplied in response to a previous PEP_NOTIFY_PPM_QUERY_PLATFORM_STATES notification.

Remarks

This structure is used by the PEP_DPM_DEVICE_IDLE_CONSTRAINTS notification. All three members of this structure contain input values that are supplied by the Windows power management framework (PoFx). In response to this notification, the PEP writes DEVICE_POWER_STATE enumeration values to the elements of the array pointed to by the MinimumDStates member. PoFx allocates the storage for this array before sending the notification.

Requirements

Requirement Value
Minimum supported client Supported starting with Windows 10.
Header pepfx.h (include Pep_x.h)

See also

DEVICE_POWER_STATE

PEP_DPM_DEVICE_IDLE_CONSTRAINTS

PEP_DPM_REGISTER_DEVICE