IOCTL_INTERNAL_I8042_KEYBOARD_WRITE_BUFFER IOCTL (ntdd8042.h)
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.
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
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.
Requirements
| Requirement | Value |
|---|---|
| Header | ntdd8042.h (include Ntdd8042.h) |