From: Hans Verkuil <hans.verkuil@xxxxxxxxx> This RFC patch series implements properties for the media controller. This is not finished, but I wanted to post this so people can discuss this further. No documentation yet (too early for that). An updated v4l2-ctl and v4l2-compliance that can report properties is available here: https://git.linuxtv.org/hverkuil/v4l-utils.git/log/?h=props There is one main missing piece: currently the properties are effectively laid out in random order. My plan is to change that so they are grouped by object type and object owner. So first all properties for each entity, then for each pad, etc. I started to work on that, but it's a bit more work than expected and I wanted to post this before the weekend. While it is possible to have nested properties, this is not currently implemented. Only properties for entities and pads are supported in this code, but that's easy to extend to interfaces and links. I'm not sure about the G_TOPOLOGY ioctl handling: I went with the quickest option by renaming the old ioctl and adding a new one with property support. I think this needs to change (at the very least the old and new should share the same ioctl NR), but that's something for the future. Currently I support u64, s64 and const char * property types. But it can be anything including binary data if needed. No array support (as we have for controls), but there are enough reserved fields in media_v2_prop to add this if needed. I added properties for entities and pads to vimc, so I could test this. Regards, Hans Hans Verkuil (3): uapi/linux/media.h: add property support media: add support for properties vimc: add test properties drivers/media/media-device.c | 98 +++++++++++- drivers/media/media-entity.c | 65 ++++++++ drivers/media/platform/vimc/vimc-common.c | 18 +++ drivers/media/platform/vimc/vimc-core.c | 6 +- include/media/media-device.h | 6 + include/media/media-entity.h | 172 ++++++++++++++++++++++ include/uapi/linux/media.h | 62 +++++++- 7 files changed, 420 insertions(+), 7 deletions(-) -- 2.18.0
