IOCTL_LAMP_GET_INTENSITY_WHITE IOCTL (lamp.h)

The IOCTL_LAMP_GET_INTENSITY_WHITE control code queries the light intensity when the lamp is configured to emit white light.

#define IOCTL_LAMP_GET_INTENSITY_WHITE \
    CTL_CODE(IOCTL_LAMP_BASE, 0x0004, METHOD_BUFFERED, FILE_ANY_ACCESS)

Major code

IRP_MJ_DEVICE_CONTROL

Input buffer

Irp->AssociatedIrp.SystemBuffer points to a LAMP_INTENSITY_WHITE structure.

Input buffer length

Length of a LAMP_INTENSITY_WHITE structure.

Output buffer

Irp->AssociatedIrp.SystemBuffer is filled with the light intensity information.

Output buffer length

IO_STACK_LOCATION.Parameters.DeviceIoControl.OutputBufferLength is the length of the buffer in bytes, passed in the Irp->AssociatedIrp.SystemBuffer field.

Status block

The driver sets Irp->IoStatus.Status to STATUS_SUCCESS or the appropriate error status.

If the device has been acquired by a camera driver, the lamp driver should return a STATUS_RESOURCE_IN_USE error via Irp->IoStatus.Status.

Remarks

The payload type of this IOCTL is a LAMP_INTENSITY_WHITE structure.

The Value field is the white light intensity in percentage (0 - 100).

Requirements

Requirement	Value
Header	lamp.h