On Kernel 2.6.39, the omap3 driver was introduced together with a new way to control complex V4L2 devices used on embedded systems, but this was never documented, as the original idea were to have "soon" support for standard apps to use it as well, via libv4l, but that didn't happen so far. Also, it is not possible for an userspace applicatin to detect the kind of control a device supports. This series fill the gap, by documenting the new type of hardware control and adding a way for userspace to detect if the device can be used or not by an standard V4L2 application. Notes: ==== 1) For the sake of better review, this series start with the addition of a glossary, as requested by Laurent. Please notice, however, that the glossary there references some new captions that will only be added by subsequent patches. So, when this series get applied, the glossary patch should actually be merged after the patches that introduce those new captions, in order to avoid warnings for non-existing references. 2) This series doesn't contain patches that actually use the new flag. This will be added after such patch gets reviewed. v8: - Addressed Hans and Sakari's comments. Hopefully, we'll all agree with this one :-) - Added :term:`foo` references at the glossary and at the first time a term appears inside a V4L2 section. I opted to not replace all occurences for a couple of reasons: a) it sounded overkill to me; b) if we decide to change some term, there will be a lot more stuff to be fixed, specially for terms in plural, as a plural for :term:`device` would be :term:`devices <device>`. Once we set this patchset into a stone, it could make sense to run some script that would replace every other occurrence of the glossary terms within Documentation/media/uapi/v4l to link to the glossary reference - but let's postpone this to be applied on a separate patchset. Btw, it probably makes sense to make the glossary as a general media book glossary - but again, this is out of topic for this patchset. v7: - Altered some nomenclature at the glossary as suggested by Hans and used git-filter to change it on all patches. v6: - Some editorial changes based on comments from Hans and Sakari. v5: - Added more terms to the glossary - Adjusted some wording as proposed by Hans on a few patches and added his ack on others v4: - Addressed Hans comments for v2; - Fixed broken references at the glossary.rst v3: - Add a glossary to be used by the new documentation about hardware control; - Add a patch removing minor number range - Use glossary terms at open.rst - Split the notice about subdev-API on vdev-centric, as this change will require further discussions. v2: - added a patch at the beginning of the series better defining the device node naming rules; - better defined the differenes between device hardware and V4L2 device node as suggested by Laurent and with changes proposed by Hans and Sakari - changed the caps flag to indicate MC-centric devices - removed the final patch that would use the new caps flag. I'll write it once we agree on the new caps flag. Mauro Carvalho Chehab (7): media: add glossary.rst with a glossary of terms used at V4L2 spec media: open.rst: better document device node naming media: open.rst: remove the minor number range media: open.rst: document vdevnode-centric and mc-centric types media: open.rst: Adjust some terms to match the glossary media: videodev2: add a flag for MC-centric devices media: open.rst: add a notice about subdev-API on vdev-centric Documentation/media/uapi/v4l/glossary.rst | 167 +++++++++++++++++++++++ Documentation/media/uapi/v4l/open.rst | 158 +++++++++++++++++---- Documentation/media/uapi/v4l/v4l2.rst | 1 + Documentation/media/uapi/v4l/vidioc-querycap.rst | 5 + Documentation/media/videodev2.h.rst.exceptions | 1 + include/uapi/linux/videodev2.h | 2 + 6 files changed, 309 insertions(+), 25 deletions(-) create mode 100644 Documentation/media/uapi/v4l/glossary.rst -- 2.13.6
