[libcamera-devel] [PATCH v6 0/6] media: Register read-only sub-dev devnode

[Jacopo Mondi]

Hello,
  this new v6 addresses the last two concerns on the series
1) Versioning of the new VIDIOC_SUBDEV_QUERYCAP IOCTL is done by adding
   a reserved field
2) Renamed the struct v4l2_subdev_capabilities.subdev_cap field to
   struct v4l2_subdev_capabilities.capabilities
3) Replace v5 [4/6] with a new
   "media: v4l2-subdev: Guard whole fops and ioctl hdlr" which was
   sent as 5.1 RFC and there return -ENODEV in stub function as suggested
   by Sakari.

Series based on latest media tree master.

Applies cleanly on Hans' br-v5.8g (I was afraid of documentation clashes, seems
there are none).

Thanks
   j

v5.1->v6:
- Add __u32 reserved[14] field to struct v4l2_subdev_capabilities
- s/v4l2_subdev_capabilities.subdev_cap/v4l2_subdev_capabilities.capabilities
- Update documentation accordingly

v5->v5.1:
- Replace
  "media: v4l2-subdev: Assume V4L2_SUBDEV_API is selected"
  with
  "media: v4l2-subdev: Guard whole fops and ioctl hdlr"

v4->v5:
- Add "media: v4l2-subdev: Assume V4L2_SUBDEV_API is selected"
- Use BIT() instead of manual bitshifting
- Use tabs in documentation in place of 8 spaces
- minor documentation fixes

v3->v4:
- Rebase v3 on latest media master and new documentation layout
- Add SUBDEV_QUERYCAP support

v2->v3:
- Add Sakari's ack to the series
- Documentation:
  - Address Sakari' and Hans suggestions
- Implementation:
  - Rename V4L2_FL_RO_DEVNODE to V4L2_FL_SUBDEV_RO_DEVNODE
  - Limit the ability to register sub-device video device nodes to
    driver claiming support for CONFIG_VIDEO_V4L2_SUBDEV_API

v1->v2:
- Documentation:
  - Add a new patch using Laurent's suggestion to update the sub-device
    userspace API introduction
  - Take in some of Laurent's suggestions in v4l2-subdev.rst and add a new
    section in dev-subdev.rst
- Implementation:
  - As noted by Andrey, V4L2_FL_* are meant to be used as bitmasks. Use
    test_bit()/set_bit() as the rest of the v4l2 core does. It's a bit an
    overkill compared to use plain BIT() as noted by Sakari but I preferred
    consistency with the rest of the core
  - Make v4l2_device_register_subdev_nodes() and
    v4l2_device_register_ro_subdev_nodes() to v4l2-device.h and make them
    inline functions. Documentation style has been copied from other functions
    with similar implementations, such as __video_register_device() in
    v4l2-dev.h


Hans Verkuil (2):
  v4l2-subdev: add VIDIOC_SUBDEV_QUERYCAP ioctl
  v4l: document VIDIOC_SUBDEV_QUERYCAP

Jacopo Mondi (4):
  Documentation: media: Update sub-device API intro
  Documentation: media: Document read-only subdevice
  media: v4l2-dev: Add v4l2_device_register_ro_subdev_node()
  media: v4l2-subdev: Guard whole fops and ioctl hdlr

 .../driver-api/media/v4l2-subdev.rst          |  53 +++++++-
 .../userspace-api/media/v4l/dev-subdev.rst    |   5 +
 .../userspace-api/media/v4l/user-func.rst     |   1 +
 .../media/v4l/vidioc-g-dv-timings.rst         |   6 +
 .../userspace-api/media/v4l/vidioc-g-std.rst  |   6 +
 .../media/v4l/vidioc-subdev-g-crop.rst        |   9 ++
 .../media/v4l/vidioc-subdev-g-fmt.rst         |   8 ++
 .../v4l/vidioc-subdev-g-frame-interval.rst    |   8 ++
 .../media/v4l/vidioc-subdev-g-selection.rst   |   8 ++
 .../media/v4l/vidioc-subdev-querycap.rst      | 117 ++++++++++++++++++
 drivers/media/v4l2-core/v4l2-device.c         |   7 +-
 drivers/media/v4l2-core/v4l2-subdev.c         |  70 +++++++++--
 include/media/v4l2-dev.h                      |   7 ++
 include/media/v4l2-device.h                   |  50 +++++++-
 include/uapi/linux/v4l2-subdev.h              |  18 +++
 15 files changed, 357 insertions(+), 16 deletions(-)
 create mode 100644 Documentation/userspace-api/media/v4l/vidioc-subdev-querycap.rst

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2.26.1