linux-kernel - [RFC PATCH 0/2] media: v4l2: map UVC_CT_ROLL_ABSOLUTE

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Date:   Thu,  3 Aug 2023 23:28:56 +0200
From:   Gergő Köteles <soyer@....hu>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Gergő Köteles <soyer@....hu>
Subject: [RFC PATCH 0/2] media: v4l2: map UVC_CT_ROLL_ABSOLUTE_CONTROL

Hi,

Logitech Streamcam can be mounted in 'portrait mode' as well.
It reports the current roll (-90, 0, 90, 180) with
UVC_CT_ROLL_ABSOLUTE_CONTROL.

This RFC defines V4L2_CID_ROLL_ABSOLUTE, and maps
UVC_CT_ROLL_ABSOLUTE_CONTROL to make it available to
userspace.
Then, the userspace can rotate the stream based on the roll.

Is it better to use V4L2_CID_CAMERA_SENSOR_ROTATION for this?
The value set matches that control.
If yes, is it worth mapping UVC_CT_ROLL_ABSOLUTE_CONTROL to
V4L2_CID_CAMERA_SENSOR_ROTATION for this camera only?

Any feedback is greately appreciated.

Gergő Köteles (2):
  media: v4l2: ctrls: Add ROLL_ABSOLUTE control
  media: v4l2: map UVC_CT_ROLL_ABSOLUTE_CONTROL

 .../userspace-api/media/v4l/ext-ctrls-camera.rst         | 5 +++++
 drivers/media/usb/uvc/uvc_ctrl.c                         | 9 +++++++++
 drivers/media/v4l2-core/v4l2-ctrls-defs.c                | 1 +
 include/uapi/linux/v4l2-controls.h                       | 2 ++
 4 files changed, 17 insertions(+)

base-commit: 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5
-- 
2.41.0