[v7,0/3] adc-joystick: Add polled support

Message

Chris Morgan July 5, 2022, 7:03 p.m. UTC

From: Chris Morgan <[e-mail]>

Add support to the existing adc-joystick driver to support polling
rather than relying on triggered buffers. This is useful for devices
that do not offer triggered buffers in hardware. Code adapted from
changes made by Maya Matuszczyk <[e-mail]>.

Changes from V6:
 - Reverted back to "poll-interval" after mailing list discussion.
 - Referenced input.yaml for definition of poll-interval in adc-joystick
   documentation.

Changes from V5:
 - Corrected an error found by yamllint in the documentation.

Changes from V4:
 - Added unit property to devicetree attribute making it now
   "poll-interval-ms".
 - Simplified logic for setting polled value and made variable names
   more clear.

Changes from V3:
 - After lengthy discussion decided to support with existing attribute
   of "poll-interval". If present, the driver will use polling and if
   not present, it will use triggered buffers (as the driver does
   today).
 - Corrected some lines to honor the 80 character line-limit.
 - Check return value from polling method and return early if there
   is an error reading the data.

Changes from V2:
 - Changed parameter from "adc-joystick,polled" to
   "adc-joystick,no-hardware-trigger" as it is more representative of
   what the driver and hardware are doing.

Changes from V1:
 - Removed driver compatible string of "adc-joystick-polled".
 - Added new optional boolean value of "adc-joystick,polled".
 - Cleaned up if statements regarding polling behavior.


Chris Morgan (3):
  dt-bindings: adc-joystick: add poll-interval
  Input: adc-joystick - Add polled input device support
  arm64: dts: rockchip: Update joystick to polled for OG2

 .../bindings/input/adc-joystick.yaml          |  5 ++
 .../boot/dts/rockchip/rk3326-odroid-go2.dts   |  1 +
 drivers/input/joystick/adc-joystick.c         | 51 +++++++++++++++----
 3 files changed, 46 insertions(+), 11 deletions(-)