diff options
| author | Steve Longerbeam <slongerbeam@gmail.com> | 2020-05-01 19:15:37 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-05-18 11:14:05 +0200 |
| commit | 0d3c81e82da90f0752a09c38ffae7e7ffec01b33 (patch) | |
| tree | 019206dccf42ce4f15f4666266cf10dbe3d04e99 /include/media | |
| parent | 8fe784b9abb296124d0182eac35b96dbc29d049a (diff) | |
media: v4l2-mc: add v4l2_create_fwnode_links helpers
Add functions to create media links between source and sink subdevices,
based on the fwnode endpoint connections between them:
v4l2_create_fwnode_links_to_pad() - create links from a source subdev to
a single sink pad based on fwnode
endpoint connections.
v4l2_create_fwnode_links() - create all links from a source to sink subdev
based on fwnode endpoint connections.
These functions can be used in a sink's v4l2-async notifier subdev
bound callback to make the links from the bound subdev.
Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/v4l2-mc.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/include/media/v4l2-mc.h b/include/media/v4l2-mc.h index 5e73eb8e28f6..246eed398648 100644 --- a/include/media/v4l2-mc.h +++ b/include/media/v4l2-mc.h @@ -12,6 +12,7 @@ #include <media/media-device.h> #include <media/v4l2-dev.h> +#include <media/v4l2-subdev.h> #include <linux/types.h> /* We don't need to include pci.h or usb.h here */ @@ -84,6 +85,53 @@ void v4l_disable_media_source(struct video_device *vdev); */ int v4l_vb2q_enable_media_source(struct vb2_queue *q); +/** + * v4l2_create_fwnode_links_to_pad - Create fwnode-based links from a + * source subdev to a sink subdev pad. + * + * @src_sd - pointer to a source subdev + * @sink - pointer to a subdev sink pad + * + * This function searches for fwnode endpoint connections from a source + * subdevice to a single sink pad, and if suitable connections are found, + * translates them into media links to that pad. The function can be + * called by the sink subdevice, in its v4l2-async notifier subdev bound + * callback, to create links from a bound source subdevice. + * + * .. note:: + * + * Any sink subdevice that calls this function must implement the + * .get_fwnode_pad media operation in order to verify endpoints passed + * to the sink are owned by the sink. + * + * Return 0 on success or a negative error code on failure. + */ +int v4l2_create_fwnode_links_to_pad(struct v4l2_subdev *src_sd, + struct media_pad *sink); + +/** + * v4l2_create_fwnode_links - Create fwnode-based links from a source + * subdev to a sink subdev. + * + * @src_sd - pointer to a source subdevice + * @sink_sd - pointer to a sink subdevice + * + * This function searches for any and all fwnode endpoint connections + * between source and sink subdevices, and translates them into media + * links. The function can be called by the sink subdevice, in its + * v4l2-async notifier subdev bound callback, to create all links from + * a bound source subdevice. + * + * .. note:: + * + * Any sink subdevice that calls this function must implement the + * .get_fwnode_pad media operation in order to verify endpoints passed + * to the sink are owned by the sink. + * + * Return 0 on success or a negative error code on failure. + */ +int v4l2_create_fwnode_links(struct v4l2_subdev *src_sd, + struct v4l2_subdev *sink_sd); /** * v4l2_pipeline_pm_get - Increase the use count of a pipeline |