On Thu, Oct 19, 2017 at 2:17 AM, Hans de Goede [off-list ref] wrote:

On some x86 tablets with a silead touchscreen the windows logo on the
front is a capacitive home button. Touching this button results in a touch
with bits 12-15 of the Y coordinates set, while normally only the lower 12
are used.

Detect this and report a KEY_LEFTMETA press when this happens. Note for
now we only respond to the Y coordinate bits 12-15 containing 0x01, on some
tablets *without* a capacative button I've noticed these bits containing

capacitive

0x04 when crossing the edges of the screen.

Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Hans de Goede <redacted>
---
Changes in v2:
-Only enable support for the home-button if a "silead,home-button"
 boolean device-property is set on the device

Changes in v3:
-Document the new silead,home-button property in:
 Documentation/devicetree/bindings/input/touchscreen/goodix.txt
---
 .../bindings/input/touchscreen/silead_gsl1680.txt  |  2 +

Acked-by: Rob Herring <robh@kernel.org>

 drivers/input/touchscreen/silead.c                 | 46 ++++++++++++++++------
 2 files changed, 37 insertions(+), 11 deletions(-)