[RESEND,0/5] input: iqs269a: Add support for slider gestures and OTP variants

Message

Jeff LaBundy Sept. 16, 2020, 8:49 p.m. UTC

This series introduces support for some additional features offered by the
Azoteq IQS269A capacitive touch controller.

Patches 1 and 2 add support for slider gestures (e.g. tap or swipe). Gestures
are recognized by the hardware itself based on touch activity across the chan-
nels associated with the slider. This feature is useful for lightweight systems
that do not post-process absolute coordinates to determine gestures expressed
by the user.

Gestures are presented to user space as keycodes. An example use-case is an
array of multimedia keys as seen in the following demo:

https://youtu.be/k_vMRQiHLgA

Patches 3 and 4 add support for the device's available OTP variants, which
trade features or exhibit errata that require workarounds. Patch 5 represents
a minor fix that is included in the series because it requires patch 2 in order
to apply cleanly.

This series is being resent with a previous patch 6 ("input: iqs269a: Disable
channels before configuring them") dropped, as a more optimal workaround that
prevents GPIO3 from inadvertently toggling during calibration has since been
highlighted. If found to be viable, it will be sent as a future patch.

Note that this series is based on mainline as the binding patches require
086e9074f52f ("dt-bindings: Remove more cases of 'allOf' containing a '$ref'")
in order to apply cleanly.

Jeff LaBundy (5):
  dt-bindings: input: iqs269a: Add bindings for slider gestures
  input: iqs269a: Add support for slider gestures
  dt-bindings: input: iqs269a: Add bindings for OTP variants
  input: iqs269a: Add support for OTP variants
  input: iqs269a: Make sliders two-dimensional

 .../devicetree/bindings/input/iqs269a.yaml         |  95 ++++++-
 drivers/input/misc/iqs269a.c                       | 315 ++++++++++++++++++---
 2 files changed, 377 insertions(+), 33 deletions(-)

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2.7.4