- 11 1月, 2016 40 次提交
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由 Javier Martinez Canillas 提交于
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: NSakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com> Acked-by: NSakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
There is one struct and two functions that were not documented. Add the corresponding kernel-doc documentation for them. Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
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: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Add kernel-doc documentation for media_device_get_devres and media_device_find_devres. Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Add a basic documentation for most ancillary functions. Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Improve the documentation to let it clear that the entity function must be initialized. Suggested-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
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: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
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: NSakari Ailus <sakari.ailus@iki.fi> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
No functional changes. Suggested-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Now that we moved the content of the media-framework.txt into the kerneldoc documentation, move the per-function specific documentation to the corresponding functions and clean it up. It would be good if we had already the markdown kernel-doc patches merged upstream, but, while we doesn't have it, let's make it less ugly at device-drivers.xml. Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
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: NLaurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Instead of using a text file, let's put it together with the struct documentation for the Media Controller. Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Both revision and group_id fields were never used and were always initialized to zero. Remove them. Suggested-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
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: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
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: NSakari Ailus <sakari.ailus@iki.fi> Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
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: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
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: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Drivers should check if media_create_pad_link() actually worked. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Drivers should check if interfaces and interface links were created. Add a must_check for them. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
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: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Only a few structs are documented on kernel-doc-nano format (the ones added by the MC next gen patches). Add a documentation for all structs, and ensure that they'll be producing the documentation at the Kernel's device driver DocBook. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
V4L2 device (and subdevice) nodes should create an interface, if the Media Controller support is enabled. Please notice that radio devices should not create an entity, as radio input/output is either via wires or via ALSA. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Tuners actually have at least one connector on its input. Add a PAD to connect it. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Some parts of the media controller are using mutexes while others are using spin locks in order to protect creation and removal of elements in the graph. That's wrong! Also, the V4L2 core can remove graph elements on non-interactive context: BUG: sleeping function called from invalid context at include/linux/sched.h:2776 Fix it by always using spin locks for graph element addition/removal, just like entity creation/removal is protected at media-device.c Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Just like what's done with entities, when the media controller is unregistered, release any interface and interface links that might still be there. Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Add functions to explicitly unregister all entity links. This function is called automatically when an entity link is destroyed. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Every time a graph object is added or removed, the version of the topology changes. That's a requirement for the new MEDIA_IOC_G_TOPOLOGY, in order to allow userspace to know that the topology has changed after a previous call to it. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
The MC next gen API sends objects to userspace grouped by their types. In the case of pads and links, in order to improve performance and have a simpler code, the best is to store them also on separate linked lists at MC. If we don't do that, we would need this kind of interaction to send data to userspace (code is in structured english): for each entity: for each pad: store pads for each entity: for each link: store link for each interface: for each link: store link With would require one nested loop for pads and two nested loops for links. By using separate linked lists for them, just one loop would be enough. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Let's control the topology changes inside the graph_object. So, move the addition and removal of interfaces/entities from the mdev lists to media_gobj_init() and media_gobj_remove(). The main reason is that mdev should have lists for all object types, as the new MC api will require to store objects in separate places. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Just like we do with entities, use a similar macro for the interfaces loop. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Add a new ioctl that will report the entire topology on one go. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Don't use anymore the type/subtype entity data/macros inside the Kernel. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Acked-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
As we'll be removing entity subtypes from the Kernel, we need to provide a way for drivers and core to check if a given entity is represented by a V4L2 subdev or if it is an V4L2 I/O entity (typically with DMA). Drivers that create entities that don't belong to any defined subdev category should use MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
The media device should list the interface objects, so add a linked list for those interfaces in struct media_device. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Now that we have a new graph object called "interfaces", we need to be able to link them to the entities. Add a linked list to the interfaces to allow them to be linked to the entities. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
By adding an union at media_link, we get for free a way to represent interface->entity links. No need to change anything at the code, just at the internal header file. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
The entire logic that represent graph links were developed on a time where there were no needs to dynamic remove links. So, although links are created/removed one by one via some functions, they're stored as an array inside the entity struct. As the array may grow, there's a logic inside the code that checks if the amount of space is not enough to store the needed links. If it isn't the core uses krealloc() to change the size of the link, with is bad, as it leaves the memory fragmented. So, convert links into a list. Also, currently, both source and sink entities need the link at the graph traversal logic inside media_entity. So there's a logic duplicating all links. That makes it to spend twice the memory needed. This is not a big deal for today's usage, where the number of links are not big. Yet, if during the MC workshop discussions, it was said that IIO graphs could have up to 4,000 entities. So, we may want to remove the duplication on some future. The problem is that it would require a separate linked list to store the backlinks inside the entity, or to use a more complex algorithm to do graph backlink traversal, with is something that the current graph traversal inside the core can't cope with. So, let's postpone a such change if/when it is actually needed. It should also be noticed that the media_link structure uses 44 bytes on 32-bit architectures and 84 bytes on 64-bit architecture. It will thus be allocated out of the 64-bytes and 96-bytes pools respectively. That's a 12.5% memory waste on 64-bit architectures and 31.25% on 32-bit architecture. A linked list is less efficient than an array in this case, but this could later be optimized if we can get rid of the reverse links (with would reduce memory allocation by 50%). Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
Interfaces are different than entities: they represent a Kernel<->userspace interaction, while entities represent a piece of hardware/firmware/software that executes a function. Let's distinguish them by creating a separate structure to store the interfaces. Later patches should change the existing drivers and logic to split the current interface embedded inside the entity structure (device nodes) into a separate object of the graph. Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Reviewed-by: NJavier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Javier Martinez Canillas 提交于
Now that the struct media_entity .parent field is unused, it can be safely removed. Since all the previous users were converted to use the .mdev field from the embedded struct media_gobj instead. Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com> Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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由 Mauro Carvalho Chehab 提交于
With the new API, a link can be either between two PADs or between an interface and an entity. So, we need to use a better name for the function that create links between two pads. So, rename the such function to media_create_pad_link(). No functional changes. This patch was created via this shell script: for i in $(find drivers/media -name '*.[ch]' -type f) $(find drivers/staging/media -name '*.[ch]' -type f) $(find include/ -name '*.h' -type f) ; do sed s,media_entity_create_link,media_create_pad_link,g <$i >a && mv a $i; done Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Tested-by: NJavier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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