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List:       linux-input
Subject:    [PATCH v3 0/4] Add support for XP-PEN Deco L
From:       José Expósito <jose.exposito89 () gmail ! com>
Date:       2022-05-31 18:12:42
Message-ID: 20220531181246.190729-1-jose.exposito89 () gmail ! com
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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.

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

---

v1 - Initial version
https://lore.kernel.org/linux-input/20220518224702.1409327-1-jose.exposito89@gmail.com/

v2 - Fix some errors reported by the kernel test robot:

 - Add MODULE_DESCRIPTION/LICENSE/AUTHOR to hid-uclogic-rdesc-test.c
 - Remove unused variable in uclogic_params_ugee_v2_init
 - Add sparse __force anotation in the result of cpu_to_le16
 - Add DISABLE_STRUCTLEAK_PLUGIN for KUnit tests

https://lore.kernel.org/linux-input/20220518224702.1409327-1-jose.exposito89@gmail.com/T/

v3 - This version:

 - Improve Kconfig message
 - Add .kunitconfig. Thanks to Daniel Latypov for suggesting it in an
   unrelated patch:
   https://lore.kernel.org/dri-devel/CAGS_qxpV2SsihEdgXZ6+7N0dxLmdRANq+qE4iUZ2aNrf6vuLYg@mail.gmail.com/

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/.kunitconfig             |   2 +
 drivers/hid/Kconfig                  |  11 ++
 drivers/hid/Makefile                 |   3 +
 drivers/hid/hid-ids.h                |   1 +
 drivers/hid/hid-uclogic-core.c       |   2 +
 drivers/hid/hid-uclogic-params.c     | 201 +++++++++++++++++++++++-
 drivers/hid/hid-uclogic-rdesc-test.c | 219 +++++++++++++++++++++++++++
 drivers/hid/hid-uclogic-rdesc.c      | 124 ++++++++++++++-
 drivers/hid/hid-uclogic-rdesc.h      |  24 ++-
 9 files changed, 573 insertions(+), 14 deletions(-)
 create mode 100644 drivers/hid/.kunitconfig
 create mode 100644 drivers/hid/hid-uclogic-rdesc-test.c

-- 
2.25.1

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