linux-kernel - [PATCH for-5.19/uclogic 0/4] Add support for XP-PEN Deco L

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Date:   Mon, 16 May 2022 20:13:19 +0200
From:   José Expósito <jose.exposito89@...il.com>
To:     jikos@...nel.org
Cc:     benjamin.tissoires@...hat.com, spbnick@...il.com,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        stefanberzl@...il.com,
        José Expósito <jose.exposito89@...il.com>
Subject: [PATCH for-5.19/uclogic 0/4] Add support for XP-PEN Deco L

Hello everyone,

This patchset adds support for the UGEE XP-PEN Deco L tablet.
This device belongs to a family of tablets that must receive a chunk of
magic data in order to be enabled (named UGEE v2 internally).

Once the device is enabled, its parameters can be discovered by parsing
a report descriptor. HUION v1 tablets have a similar report descriptor
but, in the case of UGEE v2 tablets, the number of buttons are also
discoverable [1].

The ability to discover the number of buttons is the reason for the
first 3 patches. They enable frame templates.
Because I lack the hardware to fully test this driver, I added some
KUnit tests to make sure no bugs are introduced.
I didn't see any other test in the subsystem (and I doubt I'm the first
person writing one) so please let me know if I need to move the test to
a different place.

The last patch enables the tablet and it should give Stefan a stable
code to work on his XP-PEN Deco Mini 7 tablet.

Stefan: I didn't include the code for the Mini 4 because once connected
no events are received until I unload and load the driver.
If anyone has a clue about why this could happen, I'd really appreciate
some help. [2]

Best wishes,
José Expósito

[1] I don't own a HUION v1 device, so I'm not sure if the information
    about the number of buttons is also present and it is not used in
    the driver for some reason.
[2] https://lore.kernel.org/linux-input/20220516112159.GA74406@elementary/T/#t

José Expósito (4):
  HID: uclogic: Make template placeholder IDs generic
  HID: uclogic: Add KUnit tests for uclogic_rdesc_template_apply()
  HID: uclogic: Allow to generate frame templates
  HID: uclogic: Add support for XP-PEN Deco L

 drivers/hid/Kconfig                  |   7 +
 drivers/hid/Makefile                 |   2 +
 drivers/hid/hid-ids.h                |   1 +
 drivers/hid/hid-uclogic-core.c       |   2 +
 drivers/hid/hid-uclogic-params.c     | 203 ++++++++++++++++++++++++-
 drivers/hid/hid-uclogic-rdesc-test.c | 215 +++++++++++++++++++++++++++
 drivers/hid/hid-uclogic-rdesc.c      | 124 ++++++++++++++-
 drivers/hid/hid-uclogic-rdesc.h      |  24 ++-
 8 files changed, 564 insertions(+), 14 deletions(-)
 create mode 100644 drivers/hid/hid-uclogic-rdesc-test.c

base-commit: f7d8e387d9aeff963e6691c0166269b8042b4ff9
-- 
2.25.1