KeyboardClassServiceCallback

The KeyboardClassServiceCallback routine is the class service callback routine that is provided by Kbdclass. A function driver calls the class service callback in its ISR dispatch completion routine. The class service callback transfers input data from the input data buffer of a device to the class data queue.

VOID
  KeyboardClassServiceCallback (
    IN PDEVICE_OBJECT  DeviceObject,
    IN PKEYBOARD_INPUT_DATA  InputDataStart,
    IN PKEYBOARD_INPUT_DATA  InputDataEnd,
    IN OUT PULONG  InputDataConsumed
    );

Parameters

DeviceObject

Pointer to the class device object.

InputDataStart

Pointer to the first keyboard input data packet in the input data buffer of the port device.

InputDataEnd

Pointer to the keyboard input data packet that immediately follows the last data packet in the input data buffer of the port device.

InputDataConsumed

Pointer to the number of keyboard input data packets that are transferred by the routine.

Return Value

None

Headers

Declared in kbdclass.h. Include kbdclass.h.

Comments

KeyboardClassServiceCallback transfers input data from the input buffer of the device to the class data queue. This routine is called by the ISR dispatch completion routine of the function driver.

KeyboardClassServiceCallback can be supplemented by a filter service callback that is provided by an upper-level keyboard filter driver. A filter service callback filters the keyboard data that is transferred to the class data queue. For example, the filter service callback can delete, transform, or insert data. Kbfiltr, the sample filter driver in the Windows DDK, includes KbFilter_ServiceCallback, which is a template for a keyboard filter service callback.

KeyboardClassServiceCallback runs in kernel mode at IRQL=DISPATCH_LEVEL.

See Also

KbFilter_ServiceCallback, KEYBOARD_INPUT_DATA