linux-toradex.git/include/media/v4l2-subdev.h, branch v3.4.16

[media] V4L: add .g_std() core V4L2 subdevice operation

2011-11-03T20:29:02+00:00

VIDIOC_G_STD can return the current TV-norm to the user in one of two ways:
if an .vidioc_g_std() ioctl operation is provided by the driver, it is
called, otherwise the value ot the .current_norm field of struct
video_device is returned. Since subdevice drivers currently have no access
to struct video_device objects, the only way to provide this information to
the user is by implementing a .g_std() method.

Signed-off-by: Guennadi Liakhovetski 
Signed-off-by: Mauro Carvalho Chehab

[media] V4L: dynamically allocate video_device nodes in subdevices

2011-11-03T20:29:01+00:00

Currently only very few drivers actually use video_device nodes, embedded
in struct v4l2_subdev. Allocate these nodes dynamically for those drivers
to save memory for the rest.

Signed-off-by: Guennadi Liakhovetski 
Tested-by: Sylwester Nawrocki 
Acked-by: Laurent Pinchart 
Signed-off-by: Mauro Carvalho Chehab

[media] V4L: add media bus configuration subdev operations

2011-07-27T20:56:08+00:00

Add media bus configuration types and two subdev operations to get
supported mediabus configurations and to set a specific configuration.
Subdevs can support several configurations, e.g., they can send video data
on 1 or several lanes, can be configured to use a specific CSI-2 channel,
in such cases subdevice drivers return bitmasks with all respective bits
set. When a set-configuration operation is called, it has to specify a
non-ambiguous configuration.

Signed-off-by: Stanimir Varbanov 
Signed-off-by: Guennadi Liakhovetski 
Signed-off-by: Mauro Carvalho Chehab

[media] v4l: add g_std_output callback to V4L2 subdev

2011-07-27T20:56:00+00:00

Callback is used to acquire current analog TV standard from a subdev.
It is used to avoid keeping current standard in top-level driver.

Signed-off-by: Tomasz Stanislawski 
Signed-off-by: Kyungmin Park 
Signed-off-by: Mauro Carvalho Chehab

[media] v4l: add g_dv_preset callback to V4L2 subdev

2011-07-27T20:56:00+00:00

Callback is used to acquire current digital video preset from a subdev.
It is used to avoid keeping dv preset in top-level driver.

Signed-off-by: Tomasz Stanislawski 
Signed-off-by: Kyungmin Park 
Signed-off-by: Mauro Carvalho Chehab

[media] v4l: add g_tvnorms_output callback to V4L2 subdev

2011-07-27T20:56:00+00:00

Callback is used to acquire TV norms supported by a subdev.
It is used to avoid having standards in top-level driver.

Signed-off-by: Tomasz Stanislawski 
Signed-off-by: Kyungmin Park 
Reviewed-by: Hans Verkuil 
Signed-off-by: Mauro Carvalho Chehab

[media] v4l2-event/ctrls/fh: allocate events per fh and per type instead of just per-fh

2011-07-27T20:53:31+00:00

The driver had to decide how many events to allocate when the v4l2_fh struct
was created. It was possible to add more events afterwards, but there was no
way to ensure that you wouldn't miss important events if the event queue
would fill up for that filehandle.

In addition, once there were no more free events, any new events were simply
dropped on the floor.

For the control event in particular this made life very difficult since
control status/value changes could just be missed if the number of allocated
events and the speed at which the application read events was too low to keep
up with the number of generated events. The application would have no idea
what the latest state was for a control since it could have missed the latest
control change.

So this patch makes some major changes in how events are allocated. Instead
of allocating events per-filehandle they are now allocated when subscribing an
event. So for that particular event type N events (determined by the driver)
are allocated. Those events are reserved for that particular event type.
This ensures that you will not miss events for a particular type altogether.

In addition, if there are N events in use and a new event is raised, then
the oldest event is dropped and the new one is added. So the latest event
is always available.

This can be further improved by adding the ability to merge the state of
two events together, ensuring that no data is lost at all. This will be
added in the next patch.

This also makes it possible to allow the user to determine the number of
events that will be allocated. This is not implemented at the moment, but
would be trivial.

Signed-off-by: Hans Verkuil 
Signed-off-by: Mauro Carvalho Chehab

[media] tuner-core/v4l2-subdev: document that the type field has to be filled in

2011-07-07T18:04:23+00:00

The tuner ops g_frequency, g_tuner and s_tuner require that the tuner type
field is filled in. Document this.

The tuner-core doc is based on a patch from Mauro Carvalho Chehab .

Signed-off-by: Hans Verkuil 
Signed-off-by: Mauro Carvalho Chehab

[media] v4l2-subdev.h: remove unused s_mode tuner op

2011-07-07T18:03:59+00:00

s_mode is no longer used, so remove it.

Signed-off-by: Hans Verkuil 
Signed-off-by: Mauro Carvalho Chehab

[media] v4l: Add subdev sensor g_skip_frames operation

2011-03-22T07:53:34+00:00

Some buggy sensors generate corrupt frames when the stream is started.
This new operation return the number of corrupt frames to skip when
starting the stream.

Signed-off-by: Laurent Pinchart 
Acked-by: Hans Verkuil 
Signed-off-by: Mauro Carvalho Chehab