CamSaveState callback function

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The CamSaveState callback function saves the current device context state.

Syntax

NTSTATUS CamSaveState(
   PDEVICE_OBJECT BusDeviceObject,
   PVOID          DeviceContext
);

Parameters

• BusDeviceObject
  Pointer to the camera minidriver's device object created by the USB hub. This value may be NULL.

• DeviceContext
  Pointer to the camera minidriver's device context.

Return value

CamSaveState must return STATUS_SUCCESS.

Remarks

USBCAMD version 1.0 calls the minidriver's CamSaveState in the context of an SRB_CHANGE_POWER_STATE request where the power state is going from ON to OFF (D0 to D3).

USBCAMD ignores the return value from the minidriver's CamSaveState callback function.

CamSaveState is called by both versions 1.0 and 2.0 of USBCAMD.

This function is optional.

Requirements

See also

SRB_CHANGE_POWER_STATE

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