IOCTL_INTERNAL_KEYBOARD_CONNECT IOCTL

Description

The IOCTL_INTERNAL_KEYBOARD_CONNECT request connects the Kbdclass service to the keyboard device. Kbdclass sends this request down the keyboard device stack before it opens the keyboard device.

After Kbfiltr received the keyboard connect request, Kbfiltr filters the connect request in the following way:

• Saves a copy of Kbdclass's CONNECT_DATA (Kbdclass) structure that is passed to the filter driver by Kbdclass
• Substitutes its own connect information for the class driver connect information
• Sends the IOCTL_INTERNAL_KEYBOARD_CONNECT request down the device stack

If the request is not successful, Kbfiltr completes the request with an appropriate error status.

Kbfiltr provides a template for a filter service callback routine that can supplement the operation of KeyboardClassServiceCallback, the Kbdclass class service callback routine. The filter service callback can filter the input data that is transferred from the device input buffer to the class data queue.

For more information about the connection of the Kbdclass service, see the following topics:

Kbdclass Class Service Callback Routine

Kbfiltr Callback Routines

Parameters

Major code

IRP_MJ_INTERNAL_DEVICE_CONTROL

Input buffer

The Parameters.DeviceIoControl.Type3InputBuffer member points to a CONNECT_DATA structure that is allocated and set by Kbdclass.

Input buffer length

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

Output buffer

The Parameters.DeviceIoControl.Type3InputBuffer member points to a CONNECT_DATA structure that is set by Kbfiltr.

Output buffer length

The size of a CONNECT_DATA structure.

Input/output buffer

Input/output buffer length

Status block

The Information member is set to zero.

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 a CONNECT_DATA structure.

STATUS_SHARING_VIOLATION

Kbfiltr is already connected (the filter driver supports only one connect request).

STATUS_SUCCESS

The request completed successfully.

See also

CONNECT_DATA (Kbdclass)

IOCTL_INTERNAL_I8042_HOOK_KEYBOARD

KeyboardClassServiceCallback