Trying to convert a Lower HID Keyboard Filter to an Upper filter above kbdhid

Hello,
A few months ago I solicited some help regarding writing a filter for a USB/HID keyboard. Thanks to all who gave help especially DH. It does work and I can even get diagnostic feed back from it.
Unfortunately, it seems to lack the flexibility I required. It is loaded as a lower filter below kbdhid. I do get the HID keyboard reports, but I can only change that single report. I want to be able
to insert an additional keyboard report ( I want to be able to send another key with it's own modifiers). I don't see/know how to do it. Here are a couple of options I thought about, but I don't know how to implement either one:
1)
It seems to me that one option would be to some how get the kbdhid driver to request a second read from the keyboard WITHOUT an actual keystroke occurring. Presumably it would be identical to the first one since the pressed keys hasn't changed
in that brief time. But, then using this second report one I could change it to insert the desired key/modifier.
2)
Another option might be to use an upper filter between kbdhid and kbdclass. (It would have to be before the I8042 to the kbdclass input because we already have an upper filter for the kbdclass that filter keystroke from a PS/2 keyboard. )
I have tried moving the existing, functional HID filter from a lower filter to an upper filter. It does load and devcon shows it to be an upper filter above kbdhid. Debug diagnostics show that DriverEntry gets call and that the EvtIoDeviceControl
routine gets called a few times initially, just like when it was a lower filter.
However, the EvtIoRead and EvtIoWrite routines never get called, let alone the ReadCompletion routine.
Obviously there is something different between lower and upper filters, but what. Do they take the same callback routines/protocols?
Also is the output of the kbdhid in HID keyboard report format or has it changed to the KEYBOARD_INPUT_DATA format.
How can I capture HID keyboard data after kbdhid?
3)
Thanks,
Don

the way to make this work with your current setup is to queue the read request kbdhid sends and then send down your own request. When you want to report a new key outside of the hw reporting, you complete the queued read with the data. This gets complex
if the read you send down completes before kbdhid can send another read
d -- This posting is provided "AS IS" with no warranties, and confers no rights.

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This question was solved.
View Solution.

Matt, you may want to start a thread here:
http://h30434.www3.hp.com/psg/?category.id=Notebook
It is HP's Notebook (laptop) forums.
Signature:
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HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
HP Omen; i7-4710QH; 8 GB memory; 256 GB San Disk SSD; Win 8.1
HP Photosmart 7520 AIO
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