linux-kernel - [RFCv2 0/8] USI stylus support series

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Date:   Fri, 26 Nov 2021 15:01:33 +0200
From:   Tero Kristo <tero.kristo@...ux.intel.com>
To:     linux-input@...r.kernel.org, benjamin.tissoires@...hat.com,
        jikos@...nel.org, mika.westerberg@...ux.intel.com,
        tero.kristo@...ux.intel.com
Cc:     linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com,
        peter.hutterer@...-t.net
Subject: [RFCv2 0/8] USI stylus support series

Hi,

This series is an update based on comments from Benjamin. What is done
is this series is to ditch the separate hid-driver for USI, and add the
generic support to core layers. This part basically brings the support
for providing USI events, without programmability (patches 1-6).

Additionally, a HID-BPF based sample is provided which can be used to
program / query pen parameters in comparison to the old driver level
implementation (patches 7-8, patch #8 is an incremental change on top of
patch #7 which just converts the fifo to socket so that the client can
also get results back from the server.)

The whole series is based on top of Benjamin's hid-bpf support work, and
I've pushed a branch at [1] with a series that works and brings in
the dependency. There are also a few separate patches in this series to
fix the problems I found from Benjamin's initial work for hid-bpf; I
wasn't able to get things working without those. The branch is also
based on top of 5.16-rc2 which required some extra changes to the
patches from Benjamin.

-Tero

[1] https://github.com/t-kristo/linux/tree/usi-5.16-rfc-v2-bpf