IOCTL_INTERNAL_I8042_KEYBOARD_WRITE_BUFFER IOCTL

Description

The IOCTL_INTERNAL_I8042_KEYBOARD_WRITE_BUFFER request writes data to the i8042 port controller to control operation of a keyboard device. A filter driver can use this request to control the operation of a keyboard.

I8042prt synchronizes write buffer requests and other keyboard requests that write to the i8042 port controller, including IOCTL_KEYBOARD_SET_INDICATORS and IOCTL_KEYBOARD_SET_TYPEMATIC. I8042prt synchronizes the actual write of data with the keyboard ISR.

Parameters

Major code

IRP_MJ_INTERNAL_DEVICE_CONTROL

Input buffer

Parameters.DeviceIoControl.Type3InputBuffer points to a client-allocated buffer which inputs the data to write to an i8042 port controller.

Input buffer length

Parameters.DeviceIoControl.InputBufferLength is set to the number of bytes in the input buffer, which must be greater than one.

Output buffer

None

Output buffer length

None

Input/output buffer

Input/output buffer length

Status block

The Status member is set to one of the following values:

STATUS_DEVICE_NOT_READY

The keyboard interrupt is not initialized.

STATUS_INVALID_PARAMETER

The input parameters are not valid.

STATUS_IO_TIMEOUT

The request timed out.

STATUS_SUCCESS

The request completed successfully.

See also

IOCTL_KEYBOARD_SET_INDICATORS

IOCTL_KEYBOARD_SET_TYPEMATIC