Add devicetree bindings and a driver for the Wacom W9000-series penabled
touchscreens.

The driver currently only contains the information for the W9007A, which I
tested on my devices. It should also work with other chips, such as W9001 or
W9010. However, I couldn't test it on these and the message length would
need to be added.

The pen-inserted-gpios is used to get if the pen is inserted in the device
or not. It's also used as an interrupt so that the power state of the chip
itself can be controlled depending on a change of the insertion state of
the pen.

Note: This is my first driver I have ever worked on so if there is
anything I can do to improve it please let me know!

Signed-off-by: Hendrik Noack <hendrik-noack@gmx.de>
---
Changes in v2:
- remove pdct-gpios, as it's unnecessary
- fix devicetree example
- adopt to kernel coding style

---
Hendrik Noack (2):
  dt-bindings: Input: Add Wacom W9000-series penabled touchscreens
  Input: Add support for Wacom W9000-series penabled touchscreens

 .../input/touchscreen/wacom,w9007a-lt03.yaml  |  79 +++
 drivers/input/touchscreen/Kconfig             |  12 +
 drivers/input/touchscreen/Makefile            |   1 +
 drivers/input/touchscreen/wacom_w9000.c       | 479 ++++++++++++++++++
 4 files changed, 571 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/wacom,w9007a-lt03.yaml
 create mode 100644 drivers/input/touchscreen/wacom_w9000.c

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2.43.0