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20ea6adbf1
Build system: x86_64 Build-tested: bcm2708, bcm2709, bcm2710, bcm2711 Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B Signed-off-by: Marty Jones <mj8263788@gmail.com> Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
68 lines
2.1 KiB
Diff
68 lines
2.1 KiB
Diff
From 3f32e8b803061cf04a1fe31a3070e46fd0d379e8 Mon Sep 17 00:00:00 2001
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From: Daniel Scally <djrscally@gmail.com>
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Date: Wed, 2 Mar 2022 22:03:04 +0000
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Subject: [PATCH] media: v4l2-async: Create links during
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v4l2_async_match_notify()
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Upon an async fwnode match, there's some typical behaviour that the
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notifier and matching subdev will want to do. For example, a notifier
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representing a sensor matching to an async subdev representing its
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VCM will want to create an ancillary link to expose that relationship
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to userspace.
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To avoid lots of code in individual drivers, try to build these links
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within v4l2 core.
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Signed-off-by: Daniel Scally <djrscally@gmail.com>
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---
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drivers/media/v4l2-core/v4l2-async.c | 31 ++++++++++++++++++++++++++++
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1 file changed, 31 insertions(+)
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--- a/drivers/media/v4l2-core/v4l2-async.c
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+++ b/drivers/media/v4l2-core/v4l2-async.c
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@@ -275,6 +275,24 @@ v4l2_async_notifier_try_complete(struct
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static int
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v4l2_async_notifier_try_all_subdevs(struct v4l2_async_notifier *notifier);
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+static int v4l2_async_create_ancillary_links(struct v4l2_async_notifier *n,
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+ struct v4l2_subdev *sd)
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+{
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+ struct media_link *link = NULL;
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+
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+#if IS_ENABLED(CONFIG_MEDIA_CONTROLLER)
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+
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+ if (sd->entity.function != MEDIA_ENT_F_LENS &&
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+ sd->entity.function != MEDIA_ENT_F_FLASH)
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+ return 0;
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+
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+ link = media_create_ancillary_link(&n->sd->entity, &sd->entity);
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+
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+#endif
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+
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+ return IS_ERR(link) ? PTR_ERR(link) : 0;
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+}
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+
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static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier,
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struct v4l2_device *v4l2_dev,
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struct v4l2_subdev *sd,
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@@ -292,6 +310,19 @@ static int v4l2_async_match_notify(struc
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v4l2_device_unregister_subdev(sd);
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return ret;
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}
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+
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+ /*
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+ * Depending of the function of the entities involved, we may want to
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+ * create links between them (for example between a sensor and its lens
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+ * or between a sensor's source pad and the connected device's sink
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+ * pad).
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+ */
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+ ret = v4l2_async_create_ancillary_links(notifier, sd);
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+ if (ret) {
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+ v4l2_async_notifier_call_unbind(notifier, sd, asd);
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+ v4l2_device_unregister_subdev(sd);
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+ return ret;
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+ }
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/* Remove from the waiting list */
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list_del(&asd->list);
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