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Subject: media: v4l2-async: Create links during v4l2_async_match_notify() Author: Daniel Scally <[email protected]> Date: Wed Mar 2 22:03:04 2022 +0000 Upon an async fwnode match, there's some typical behaviour that the notifier and matching subdev will want to do. For example, a notifier representing a sensor matching to an async subdev representing its VCM will want to create an ancillary link to expose that relationship to userspace. To avoid lots of code in individual drivers, try to build these links within v4l2 core. Signed-off-by: Daniel Scally <[email protected]> Reviewed-by: Jean-Michel Hautbois <[email protected]> Reviewed-by: Laurent Pinchart <[email protected]> Signed-off-by: Sakari Ailus <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> drivers/media/v4l2-core/v4l2-async.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) --- diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c index 0404267f1ae4..436bd6900fd8 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -275,6 +275,24 @@ v4l2_async_nf_try_complete(struct v4l2_async_notifier *notifier) static int v4l2_async_nf_try_all_subdevs(struct v4l2_async_notifier *notifier); +static int v4l2_async_create_ancillary_links(struct v4l2_async_notifier *n, + struct v4l2_subdev *sd) +{ + struct media_link *link = NULL; + +#if IS_ENABLED(CONFIG_MEDIA_CONTROLLER) + + if (sd->entity.function != MEDIA_ENT_F_LENS && + sd->entity.function != MEDIA_ENT_F_FLASH) + return 0; + + link = media_create_ancillary_link(&n->sd->entity, &sd->entity); + +#endif + + return IS_ERR(link) ? PTR_ERR(link) : 0; +} + static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier, struct v4l2_device *v4l2_dev, struct v4l2_subdev *sd, @@ -293,6 +311,19 @@ static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier, return ret; } + /* + * Depending of the function of the entities involved, we may want to + * create links between them (for example between a sensor and its lens + * or between a sensor's source pad and the connected device's sink + * pad). + */ + ret = v4l2_async_create_ancillary_links(notifier, sd); + if (ret) { + v4l2_async_nf_call_unbind(notifier, sd, asd); + v4l2_device_unregister_subdev(sd); + return ret; + } + /* Remove from the waiting list */ list_del(&asd->list); sd->asd = asd; _______________________________________________ linuxtv-commits mailing list [email protected] https://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
