linux-kernel - Re: [PATCH v2 00/12] HID: fix for generic input processing

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Date:   Tue, 1 Mar 2022 15:53:31 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Ahelenia Ziemiańska 
        <nabijaczleweli@...ijaczleweli.xyz>,
        Ping Cheng <pinglinux@...il.com>,
        Aaron Armstrong Skomra <skomra@...il.com>,
        Jason Gerecke <killertofu@...il.com>,
        Peter Hutterer <peter.hutterer@...-t.net>,
        linux-input@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 00/12] HID: fix for generic input processing

On Thu, 3 Feb 2022, Benjamin Tissoires wrote:

> Hi,
> 
> this is the v2 of my series which reworks the HID report processing.
> 
> I took Ping's comments into account, and amended my MR with the
> regression tests[0].
> More specifically, the tests (and thus this new version of the series)
> enforces that only one BTN_TOOL_* event gets forwarded between each
> EV_SYN frame, and that BTN_TOUCH are properly translated too.
> 
> This also magivally solved some worrying transitions we had in the
> pen state machine where the pen was jumping from "eraser" to "in
> contact". This new behavior enforces a "out-of-range" state in the
> middle, making it easier for userspace to understand now.
> 
> Again, tests are welcome :)
> 
> Cheers,
> Benjamin
> 
> [0] https://gitlab.freedesktop.org/libevdev/hid-tools/-/merge_requests/127
> 
> Benjamin Tissoires (12):
>   HID: core: statically allocate read buffers
>   HID: core: de-duplicate some code in hid_input_field()
>   HID: core: split data fetching from processing in hid_input_field()
>   HID: input: tag touchscreens as such if the physical is not there
>   HID: input: rework spaghetti code with switch statements
>   HID: input: move up out-of-range processing of input values
>   HID: compute an ordered list of input fields to process
>   HID: core: for input reports, process the usages by priority list
>   HID: input: enforce Invert usage to be processed before InRange
>   HID: input: remove the need for HID_QUIRK_INVERT
>   HID: input: accommodate priorities for slotted devices
>   Input: docs: add more details on the use of BTN_TOOL
> 
>  Documentation/input/event-codes.rst |   6 +-
>  drivers/hid/hid-core.c              | 280 ++++++++++++++++++---
>  drivers/hid/hid-input.c             | 364 ++++++++++++++++++++++------
>  include/linux/hid.h                 |  23 +-
>  4 files changed, 568 insertions(+), 105 deletions(-)

This is now in hid.git#for-5.18/core.

Thanks a lot Benjamin, very nice work.

-- 
Jiri Kosina
SUSE Labs