CM_POWER_DATA structure (wdm.h)
The CM_POWER_DATA structure contains information about a device's power management state and capabilities.
Syntax
typedef struct CM_Power_Data_s {
ULONG PD_Size;
DEVICE_POWER_STATE PD_MostRecentPowerState;
ULONG PD_Capabilities;
ULONG PD_D1Latency;
ULONG PD_D2Latency;
ULONG PD_D3Latency;
DEVICE_POWER_STATE PD_PowerStateMapping[POWER_SYSTEM_MAXIMUM];
SYSTEM_POWER_STATE PD_DeepestSystemWake;
} CM_POWER_DATA, *PCM_POWER_DATA;
Members
PD_Size
The size, in bytes, of this structure.
PD_MostRecentPowerState
A DEVICE_POWER_STATE value representing the device's most recent power state.
PD_Capabilities
The device's power capabilities, represented by a combination of the following bit flags:
PDCAP_D0_SUPPORTED
PDCAP_D1_SUPPORTED
PDCAP_D2_SUPPORTED
PDCAP_D3_SUPPORTED
PDCAP_WAKE_FROM_D0_SUPPORTED
PDCAP_WAKE_FROM_D1_SUPPORTED
PDCAP_WAKE_FROM_D2_SUPPORTED
PDCAP_WAKE_FROM_D3_SUPPORTED
PDCAP_WARM_EJECT_SUPPORTED
PD_D1Latency
The device's latency when returning the D0 state from the D1 state. For more information, see the D1Latency member of DEVICE_CAPABILITIES.
PD_D2Latency
The device's latency when returning the D0 state from the D2 state. For more information, see the D2Latency member of DEVICE_CAPABILITIES.
PD_D3Latency
The device's latency when returning the D0 state from the D3 state. For more information, see the D3Latency member of DEVICE_CAPABILITIES.
PD_PowerStateMapping[POWER_SYSTEM_MAXIMUM]
An array of DEVICE_POWER_STATE values representing the maximum device power state achievable for each system power state. For more information, see the DeviceState member of DEVICE_CAPABILITIES.
PD_DeepestSystemWake
Specifies the least-powered system state from which the device can wake the system. PD_DeepestSystemWake typically indicates one of the system sleeping states, S1, S2, or S3 (as specified by PowerSystemSleeping1, PowerSystemSleeping2, and PowerSystemSleeping3, respectively). Note, however, that some devices might be able to wake the system from the system hibernate state, S4 (as specified by PowerSystemHibernate), or even from the system shutdown state, S5 (as specified by PowerSystemShutdown).
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Microsoft Windows XP and later versions of the Windows operating system. |
| Header | wdm.h (include Ntddk.h, Ntpoapi.h) |