IOCTL_INTERNAL_I8042_HOOK_KEYBOARD IOCTL (ntdd8042.h)

Article
06/16/2023

The IOCTL_INTERNAL_I8042_HOOK_KEYBOARD request does the following:

Adds an initialization callback routine to the I8042prt keyboard initialization routine
Adds an ISR callback routine to the I8042prt keyboard ISR

The initialization and ISR callbacks are optional and are provided by an upper-level filter driver for a PS/2-style keyboard device.

After I8042prt receives an IOCTL_INTERNAL_KEYBOARD_CONNECT request, it sends a synchronous IOCTL_INTERNAL_I8042_HOOK_KEYBOARD request to the top of the keyboard device stack.

After Kbfiltr receives the hook keyboard request, Kbfiltr filters the request in the following way:

Saves the upper-level information passed to Kbfiltr, which includes the context of an upper-level device object, a pointer to an initialization callback, and a pointer to an ISR callback
Replaces the upper-level information with its own
Saves the context of I8042prt and pointers to callbacks that the Kbfiltr ISR callback can use

For more information about this request and the callbacks, see the following topics:

I8042prt Callback Routines

Kbfiltr Callback Routines

Major code

IRP_MJ_INTERNAL_DEVICE_CONTROL

Input buffer

The Parameters.DeviceIoControl.Type3InputBuffer points to an INTERNAL_I8042_HOOK_KEYBOARD structure. This structure includes the following members:

Input buffer length

The Parameters.DeviceIoControl.InputBufferLength member is set to a value that is greater than or equal to the size, in bytes, of an INTERNAL_I8042_HOOK_KEYBOARD structure.

Output buffer

None

Output buffer length

None

Status block

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

STATUS_INVALID_PARAMETER

Parameters.DeviceIoControl.InputBufferLength is less than the size, in bytes, of an INTERNAL_I8042_HOOK_KEYBOARD structure.

STATUS_SUCCESS

The request completed successfully.

Requirements

Requirement	Value
Header	ntdd8042.h (include Ntdd8042.h)

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