[PATCH v4 0/4] Add support for XP-PEN Deco L

[José Expósito]

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 - https://lore.kernel.org/linux-input/20220518224702.1409327-1-jose.exposito89@xxxxxxxxx/

v2 - https://lore.kernel.org/linux-input/20220518224702.1409327-1-jose.exposito89@xxxxxxxxx/T/

 - 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

v3 - https://lore.kernel.org/linux-input/nycvar.YFH.7.76.2206081150060.10851@xxxxxxxxxxxxx/T/

 - 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@xxxxxxxxxxxxxx/

v4:

 - Group all the test of the subsystem under HID_KUNIT_TEST:
   HID_UCLOGIC_KUNIT_TEST -> HID_KUNIT_TEST
 - Remove DISABLE_STRUCTLEAK_PLUGIN:
   https://lore.kernel.org/dri-devel/CAGS_qxpFO4ixW=08ZcdcD9J1kU=B3mwoBJkPW8AKu0sKs8aKfA@xxxxxxxxxxxxxx/

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             |   5 +
 drivers/hid/Kconfig                  |  16 ++
 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, 581 insertions(+), 14 deletions(-)
 create mode 100644 drivers/hid/.kunitconfig
 create mode 100644 drivers/hid/hid-uclogic-rdesc-test.c

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2.25.1