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[media] v4l2-mc: add a generic function to create the media graph

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The em28xx_v4l2_create_media_graph() is almost generic enough to
be at the core, as an ancillary function. Make it even more generic,
by getting rid of em28xx-specific code, relying only at the
media_device, in order to discover all entities found on PC-customer's
hardware and add it at the V4L2 core.

Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Mauro Carvalho Chehab 2016-02-05 07:02:43 -02:00
commit 54d0dbac12
3 changed files with 212 additions and 0 deletions
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25
include/media/v4l2-mc.h
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@ -14,6 +14,8 @@
* GNU General Public License for more details.
*/
#include <media/media-device.h>
/**
* enum tuner_pad_index - tuner pad index for MEDIA_ENT_F_TUNER
*
@ -89,3 +91,26 @@ enum demod_pad_index {
DEMOD_PAD_VBI_OUT,
DEMOD_NUM_PADS
};
/**
* v4l2_mc_create_media_graph() - create Media Controller links at the graph.
*
* @mdev: pointer to the &media_device struct.
*
* Add links between the entities commonly found on PC customer's hardware at
* the V4L2 side: camera sensors, audio and video PLL-IF decoders, tuners,
* analog TV decoder and I/O entities (video, VBI and Software Defined Radio).
* NOTE: webcams are modelled on a very simple way: the sensor is
* connected directly to the I/O entity. All dirty details, like
* scaler and crop HW are hidden. While such mapping is enough for v4l2
* interface centric PC-consumer's hardware, V4L2 subdev centric camera
* hardware should not use this routine, as it will not build the right graph.
*/
#ifdef CONFIG_MEDIA_CONTROLLER
int v4l2_mc_create_media_graph(struct media_device *mdev);
#else
static inline int v4l2_mc_create_media_graph(struct media_device *mdev)
{
return 0;
}
#endif