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The G_TOPOLOGY ioctl is used to get a graph topology and since in the
future a graph can be dynamically updated, there is a way to know the
topology version so userspace can be aware that the graph has changed.
The version 0 is reserved to indicate that the graph is static (i.e no
graphs updates since the media device was registered).
So, now that the media device initialization and registration has been
split and the media device node is not exposed to user-space until all
the entities have been registered and links created, it is safe to set
a topology version 0 in media_device_register().
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Suggested-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Registering a V4L2 sub-device includes, among other things, registering
the related media entity and calling the sub-device's registered op. Since
patch "media: convert links from array to list", creating a link between
two pads requires registering the entity first. If the registered() op
involves link creation, the link list head will not be initialised before
it is used.
Resolve this by first registering the entity, then calling its
registered() op.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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There are now two new warnings:
drivers/media/usb/dvb-usb-v2/dvb_usb_core.c: In function 'dvb_usbv2_media_device_register':
drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:433:2: warning: ignoring return value of '__media_device_register', declared with attribute warn_unused_result [-Wunused-result]
media_device_register(adap->dvb_adap.mdev);
^
drivers/media/usb/dvb-usb/dvb-usb-dvb.c: In function 'dvb_usb_media_device_register':
drivers/media/usb/dvb-usb/dvb-usb-dvb.c:128:2: warning: ignoring return value of '__media_device_register', declared with attribute warn_unused_result [-Wunused-result]
media_device_register(adap->dvb_adap.mdev);
^
Those are because the drivers are not properly checking if the
media device init and register were succeeded.
Fix it.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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The media device node is registered and so made visible to user-space
before entities are registered and links created which means that the
media graph obtained by user-space could be only partially enumerated
if that happens too early before all the graph has been created.
To avoid this race condition, split the media init and registration
in separate functions and only register the media device node when
all the pending subdevices have been registered, either explicitly
by the driver or asynchronously using v4l2_async_register_subdev().
The media_device_register() had a check for drivers not filling dev
and model fields but all drivers in mainline set them and not doing
it will be a driver bug so change the function return to void and
add a BUG_ON() for dev being NULL instead.
Also, add a media_device_cleanup() function that will destroy the
graph_mutex that is initialized in media_device_init().
[mchehab@osg.samsung.com: Fix compilation if !CONFIG_MEDIA_CONTROLLER
and remove two warnings added by this changeset]
Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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If media_device_unregister() is called by two different
drivers, a race condition may happen, as the check if the
device is not registered is not protected.
Move the spin_lock() to happen earlier in the function, in order
to prevent such race condition.
Reported-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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media entity register and unregister functions are called by media
device register/unregister. Move them to occur earlier, as we'll need
an unlocked version of media_device_entity_unregister() and we don't
want to add a function prototype without needing it.
No functional changes.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Most media functions that unregister, check if the corresponding register
function succeed before. So these functions can safely be called even if a
registration was never made or the component as already been unregistered.
Add the same check to media_device_unregister() function for consistency.
This will also allow to split the media_device_register() function in an
initialization and registration functions without the need to change the
generic cleanup functions and error code paths for all the media drivers.
Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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As pointed by Dan, the commit f8fd4c61b5ae ("[media] media-entity:
protect object creation/removal using spin lock")' leads to the
following static checker warning:
drivers/media/media-entity.c:781 media_remove_intf_link()
error: dereferencing freed memory 'link'
drivers/media/media-entity.c
777 void media_remove_intf_link(struct media_link *link)
778 {
779 spin_lock(&link->graph_obj.mdev->lock);
780 __media_remove_intf_link(link);
781 spin_unlock(&link->graph_obj.mdev->lock);
In practice, I didn't see any troubles even with KASAN enabled. I guess
gcc optimizer internally cached the mdev reference, instead of getting
it twice. Yet, it is a very bad idea to rely on such optimization. So,
let's fix the code.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Changeset f8fd4c61b5ae ("[media] media-entity: protect object
creation/removal using spin lock") changed the object creation/removal
protection to spin lock, as this is what's used on media-device,
keeping the mutex reserved for graph traversal routines. However, it
also changed the link setup, by mistake.
This could cause troubles, as the link setup can affect the graph
traversal, and this is likely the reason for a mutex there.
So, revert media_entity_setup_link() to use mutex.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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As we're using the headers file only for documentation, move the
two kernel-doc macros to the header, and fix it to avoid
warnings.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Add kernel-doc documentation for media_device_get_devres and
media_device_find_devres.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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If a different entity->pipe in a pipeline was encountered, a warning was
issued but the execution continued as if nothing had happened. Return an
error instead right there.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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The Media Controller next gen patchset added several new fields
to be used with it. Document them.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Instead of flagging an interface link as MEDIA_LNK_FL_INTERFACE_LINK
only when returning to userspace, do it at link creation time.
That would allow using such flag internally, and cleans up a
little bit the code for G_TOPOLOGY ioctl.
[mchehab@osg.samsung.com: folded with a fixup from Dan Carpenter,
replacing & by &&]
Suggested-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Commit 86ee417578a2 ("[media] media: convert links from array to list")
had many changes that were automated using coccinelle but the semantic
patch was not smart enough to rely on operators precedence and avoid
using unnecessary enclosing parenthesis.
This patch removes them since are not needed.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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The uvc_mc_register_entities() function iterated over the entities three
times to initialize the entities, register the subdev for the ones whose
type was UVC_TT_STREAMING and to create the entities links.
But this can be simplied by merging the init and registration logic in a
single loop.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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The function uvc_mc_create_pads_links() creates entities links but the
"pads" prefix is redundant since the driver doesn't handle any other
kind of link, so it can be removed.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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The for loop in the vsp1_create_entities() function that create the links,
checks the entity type and call the proper link creation function but then
it uses continue to force the next iteration of the loop to take place and
skipping code in between that creates links for different entities types.
It is more readable and easier to understand if the if else constructs is
used instead of the continue statement.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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The functions that create entities links are called *_create_pads_links()
but the "pads" prefix is redundant since the driver doesn't handle any
other kind of link so it can be removed.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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The isp_subdev_notifier_complete() complete callback defines a struct
v4l2_device *v4l2_dev to avoid needing two level of indirections to
access the V4L2 subdevs but the var is not always used when possible
as when calling v4l2_device_register_subdev_nodes().
So change that to consistently use the defined v4l2_dev pointer var.
Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Commit bc36b30fe06b ("[media] omap3isp: separate links creation from
entities init") moved the link creation logic from the entities init
functions and so removed the error_link labels from the error paths.
But after that, some functions have a single error label so it makes
more sense to rename the label to just "error" in thi case.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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The function that creates the links between ISP internal and external
entities is called isp_create_pads_links() but the "pads" prefix is
redundant since the driver doesn't handle any other kind of link so
it can just be removed.
While being there, fix the function's kernel-doc since is not using
a proper format.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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The entities to video nodes links were created on separate functions for
each ISP module but since the only thing that these functions do is to
call media_create_pad_link(), there's no need for that indirection level
and all link creation logic can be just inlined in the caller function.
Also, since the only possible failure for the link creation is a memory
allocation, there is no need for error messages since the core already
reports a very verbose message in that case.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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By using u64 integers and pointers, we can get rid of compat32
logic. So, let's do it!
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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The pad index is unsigned. Replace the occurences of it where
pertinent.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Several additional functions are described at media-entity.c.
Moving them to the header file, to make the code cleaner and
to have all such macros at the same place.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Those media_obj_* functions are actually creating/destroying
media graph objects. So, rename them to better represent
what they're actually doing.
No functional changes.
This was created via this small shell script:
for i in $(git grep -l media_gobj_init); do sed s,media_gobj_init,media_gobj_create,g <$i >a && mv a $i; done
for i in $(git grep -l media_gobj_remove); do sed s,media_gobj_remove,media_gobj_destroy,g <$i >a && mv a $i; done
Suggested-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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> > > + if (rlink != link->reverse) {
> > > + r++;
> >
> > The variable is incremented here but otherwise never used, you can remove it.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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declaration
Move this function to happen earlier, in order to avoid
a uneeded forward declaration.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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No functional changes.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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This function was used in the past to free the links
that were allocated by the media controller core.
However, this is not needed anymore. We should likely
get rid of the funcion on some function, but, for now,
let's just convert into an inlined function and let the
compiler to get rid of it.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Both revision and group_id fields were never used and were always
initialized to zero. Remove them.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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With the MC next gen rework, what's left for media_entity_init()
is to just initialize the PADs. However, certain devices, like
a FLASH led/light doesn't have any input or output PAD.
So, there's no reason why calling media_entity_init() would be
mandatory. Also, despite its name, what this function actually
does is to initialize the PADs data. So, rename it to
media_entity_pads_init() in order to reflect that.
The media entity actual init happens during entity register,
at media_device_register_entity(). We should move init of
num_links and num_backlinks to it.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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The __media_device_enum_links() copies links definitions from
Kernelspace to userspace. It has to work with 3 structs that
handle with links. Better name them to:
link: Kernelspace internal link representation, of the
type media_link;
klink_desc: struct media_link_desc pointer to the
kernel memory where the data will be filled;
ulink_desc: struct media_link_desc pointer to the
memory where the data will be copied to
userspace.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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It is better to keep the headers in alphabetic order.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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If an entity is registered with a media device before is initialized
with media_device_register_entity(), the number of pads won't be set
so media_device_register_entity() won't create pad objects and add
it to the media device pads list.
Do this at entity initialization time if the entity was registered
before so the graph is complete and correct regardless of the order
in which the entities are initialized and registered.
Suggested-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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The entity->num_pads are defined as u16. So, better to use an
unsigned int, as this prevents additional warnings when W=2
(or W=1 on some architectures).
The "i" counter at __media_device_get_topology() is also a
monotonic counter that should never be below zero. So,
make it unsigned too.
Suggested-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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We should not be creating device nodes at IRQ contexts. So,
the only flags we'll be using will be GFP_KERNEL. Let's
remove the gfp_flags, in order to make the interface simpler.
If we ever need it, it would be easy to revert those changes.
While here, remove an extra blank line.
Suggested-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Indirect links are those whose interface indirectly controls
other functions.
There are two interfaces that have indirect controls at the DVB
side:
- the network interface, which also controls the demux;
- the DVR interface which also controls the demux.
One could argue that the frontend control to the tuner is indirect.
Well, that's debatable. There's no way to create subdev interfaces
for tuner and demod, as those devices are tightly coupled. So, it
was decided that just one interface is the best to control both
entities, and there's no plan (or easy way) to decouple both. So,
the DVB frontend interface should link to both entities.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Cleanup the code a little bit by moving the routine that creates
links between DVR and demux to the I/O entitis into a separate
function.
While here, fix the code to use strncmp() instead of strcmp().
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Rename the userspace types from MEDIA_ENT_T_ to MEDIA_ENT_F_
and add the backward compatibility bits.
The changes at the .c files was generated by the following
coccinelle script:
@@
@@
-MEDIA_ENT_T_UNKNOWN
+MEDIA_ENT_F_UNKNOWN
@@
@@
-MEDIA_ENT_T_DVB_BASE
+MEDIA_ENT_F_DVB_BASE
@@
@@
-MEDIA_ENT_T_V4L2_BASE
+MEDIA_ENT_F_V4L2_BASE
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_BASE
+MEDIA_ENT_F_V4L2_SUBDEV_BASE
@@
@@
-MEDIA_ENT_T_CONNECTOR_BASE
+MEDIA_ENT_F_CONNECTOR_BASE
@@
@@
-MEDIA_ENT_T_V4L2_VIDEO
+MEDIA_ENT_F_IO_V4L
@@
@@
-MEDIA_ENT_T_V4L2_VBI
+MEDIA_ENT_F_IO_VBI
@@
@@
-MEDIA_ENT_T_V4L2_SWRADIO
+MEDIA_ENT_F_IO_SWRADIO
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN
+MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN
@@
@@
-MEDIA_ENT_T_CONN_RF
+MEDIA_ENT_F_CONN_RF
@@
@@
-MEDIA_ENT_T_CONN_SVIDEO
+MEDIA_ENT_F_CONN_SVIDEO
@@
@@
-MEDIA_ENT_T_CONN_COMPOSITE
+MEDIA_ENT_F_CONN_COMPOSITE
@@
@@
-MEDIA_ENT_T_CONN_TEST
+MEDIA_ENT_F_CONN_TEST
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_SENSOR
+MEDIA_ENT_F_CAM_SENSOR
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_FLASH
+MEDIA_ENT_F_FLASH
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_LENS
+MEDIA_ENT_F_LENS
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_DECODER
+MEDIA_ENT_F_ATV_DECODER
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_TUNER
+MEDIA_ENT_F_TUNER
@@
@@
-MEDIA_ENT_T_DVB_DEMOD
+MEDIA_ENT_F_DTV_DEMOD
@@
@@
-MEDIA_ENT_T_DVB_DEMUX
+MEDIA_ENT_F_TS_DEMUX
@@
@@
-MEDIA_ENT_T_DVB_TSOUT
+MEDIA_ENT_F_IO_DTV
@@
@@
-MEDIA_ENT_T_DVB_CA
+MEDIA_ENT_F_DTV_CA
@@
@@
-MEDIA_ENT_T_DVB_NET_DECAP
+MEDIA_ENT_F_DTV_NET_DECAP
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Now that entities have a main function, expose it via
MEDIA_IOC_G_TOPOLOGY ioctl.
Please notice that some entities may have secundary functions.
Such use case will be addressed later, when we add support for the
Media Controller properties.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Entities should have one or more functions. Calling it as a
type proofed to not be correct, as an entity could eventually
have more than one type.
So, rename the field as function.
Please notice that this patch doesn't extend support for
multiple function entities. Such change will happen when
we have real case drivers using it.
No functional changes.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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If the graph creation fails, don't register the device.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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If the graph creation fails, don't register the device.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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If media controller is enabled and mdev is filled, it should
ensure that the media graph will be properly initialized.
Enforce that.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Interface links are normally enabled, meaning that the interfaces are
bound to the entities. So, any ioctl send to the interface are reflected
at the entities managed by the interface.
However, when a device is used, other interfaces for the same hardware
could be decoupled from the entities linked to them, because the
hardware may have some parts busy.
That's for example, what happens when an hybrid TV device is in use.
If it is streaming analog TV or capturing signals from S-Video/Composite
connectors, typically the digital part of the hardware can't be used and
vice-versa.
This is generally due to some internal hardware or firmware limitation,
that it is not easily mapped via data pipelines.
What the Kernel drivers do internally is that they decouple the hardware
from the interface. So, all changes, if allowed, are done only at some
interface cache, but not physically changed at the hardware.
The usage is similar to the usage of the MEDIA_LNK_FL_ENABLED on data
links. So, let's use the same flag to indicate if either the interface
to entity link is bound/enabled or not.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Due to the graph traversal algorithm currently in usage, we
need a copy of all data links. Those backlinks should not be
send to userspace, as otherwise, all links there will be
duplicated.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Now that connectors are entities, we need to represent the
connector links.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Depending on the input, an au0828 may have a different
number of connectors. add entities to represent them.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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