linux-kernel - [RFC 0/2] Support for buttons on newer MS Surface devices

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Date:   Thu, 16 May 2019 16:25:21 +0200
From:   Maximilian Luz <luzmaximilian@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        platform-driver-x86@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Chen Yu <yu.c.chen@...el.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Maximilian Luz <luzmaximilian@...il.com>
Subject: [RFC 0/2] Support for buttons on newer MS Surface devices

This series adds suport for power and volume buttons on 5th and 6th
generation Microsoft Surface devices. Specifically, it adds support for
the power-button on the Surface Laptop 1 and Laptop 2, as well as
support for power- and (on-device) volume-buttons on the Surface Pro 5
(2017), Pro 6, and Book 2.

These devices use the same MSHW0040 device as on the Surface Pro 4,
however, whereas the Pro 4 uses an ACPI notify handler, the newer
devices use GPIO interrupts to signal these events.

The first patch of this series ensures that the surfacepro3_button
driver, used for MSHW0040 on the Pro 4, does not probe for the newer
devices. The second patch adapts soc_button_array to implement the
actual button support.

I think the changes to soc_button_array in the second patch warrant a
thorough review. I've tried to make things a bit more generic to be able
to integrate arbitrary ACPI GPIO power-/volume-button devices more
easily, I'm not sure if there may be reasons against this. 

Maximilian Luz (2):
  platform: Fix device check for surfacepro3_button
  input: soc_button_array for newer surface devices

 drivers/input/misc/soc_button_array.c     | 134 ++++++++++++++++++++--
 drivers/platform/x86/surfacepro3_button.c |  38 ++++++
 2 files changed, 160 insertions(+), 12 deletions(-)

-- 
2.21.0