[libcamera-devel,v2,0/6,TEMP] Add support for V4L2 Controls

1381 mbox series

Hello,
   first of all, this series is half-backed, sorry about this.

I'm sending it out in this not-ready-to-merge state to ask for a validation of
the interface, as it sits between what I had in v1 and what has been suggested
during review by Laurent and Kieran.

You should basically look into the last two patches to have a taste of the
interface and look at 3/6 to check out the V4L2Controls wrapper implementation.
I still have to address comments on V4L2Base, on patch 1/6 and a few things on
3/6 (like not quering controls everytime they are get or set).

As I've said, this is just to have feedback on the user interface.

On the back storage and the V4L2ControlValue vs ControlValue discussion, I
really don't care much. I consider the template version more felxible, and the
proxy class hides from the extern the casts, providing a series of getInt()
getBool() etc methods.

Memory is managed by the V4L2Controls class and by the V4L2Base::setControls()
and V4L2Base::getControls() methods, so it should not cause issues for the
users.

As soon as I receive comments on the API, I'll fix the remaining parts and
eventually send for inclusion.

Tested on IPU3 Soraka.

Thanks
  j

Jacopo Mondi (6):
  libcamera: camera_sensor: Add dev() operation
  libcamera: Provide a V4L2Base class
  libcamera: Add V4L2Controls
  libcamera: v4l2_base: Add V4L2 control support
  libcamera: ipu3: Set pipe_mode based on stream configuration
  [HACK] ipu3: Set and get a few sensor controls

 src/libcamera/camera_sensor.cpp        |   6 +
 src/libcamera/include/camera_sensor.h  |   1 +
 src/libcamera/include/v4l2_base.h      |  42 ++
 src/libcamera/include/v4l2_controls.h  | 210 ++++++++
 src/libcamera/include/v4l2_device.h    |   9 +-
 src/libcamera/include/v4l2_subdevice.h |   9 +-
 src/libcamera/meson.build              |   3 +
 src/libcamera/pipeline/ipu3/ipu3.cpp   | 109 +++++
 src/libcamera/v4l2_base.cpp            | 302 ++++++++++++
 src/libcamera/v4l2_controls.cpp        | 632 +++++++++++++++++++++++++
 src/libcamera/v4l2_device.cpp          |  13 +-
 src/libcamera/v4l2_subdevice.cpp       |  12 +-
 12 files changed, 1318 insertions(+), 30 deletions(-)
 create mode 100644 src/libcamera/include/v4l2_base.h
 create mode 100644 src/libcamera/include/v4l2_controls.h
 create mode 100644 src/libcamera/v4l2_base.cpp
 create mode 100644 src/libcamera/v4l2_controls.cpp

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2.21.0