linux-kernel - [PATCH v3 1/3] media: v4l2-dev.c: Add Meta: to the name of metadata devices

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Message-Id: <20220117182658.468993-2-ribalda@chromium.org>
Date:   Mon, 17 Jan 2022 19:26:56 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Nicolas Dufresne <nicolas@...fresne.ca>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        tfiga@...omium.org,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH v3 1/3] media: v4l2-dev.c: Add Meta: to the name of metadata devices

Devices with Metadata output (like uvc), create two video devices, one
for the data itself and another one for the metadata.

Add a "Meta: " to the beginning of the device name, as suggested by Mauro,
to avoid having multiple devices with the same name.

Fixes v4l2-compliance:
Media Controller ioctls:
     fail: v4l2-test-media.cpp(205): v2_entity_names_set.find(key) != v2_entity_names_set.end()
   test MEDIA_IOC_G_TOPOLOGY: FAIL
     fail: v4l2-test-media.cpp(394): num_data_links != num_links
   test MEDIA_IOC_ENUM_ENTITIES/LINKS: FAIL

Suggested-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/v4l2-core/v4l2-dev.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index d03ace324db0..98be80010702 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -901,6 +901,15 @@ int __video_register_device(struct video_device *vdev,
 	if (WARN_ON(type != VFL_TYPE_SUBDEV && !vdev->device_caps))
 		return -EINVAL;
 
+	/* Add Meta: to metadata device names */
+	if (vdev->device_caps &
+	    (V4L2_CAP_META_CAPTURE | V4L2_CAP_META_OUTPUT)) {
+		char aux[sizeof(vdev->name)];
+
+		snprintf(aux, sizeof(aux), "Meta: %s", vdev->name);
+		strscpy(vdev->name, aux, sizeof(aux));
+	}
+
 	/* v4l2_fh support */
 	spin_lock_init(&vdev->fh_lock);
 	INIT_LIST_HEAD(&vdev->fh_list);
-- 
2.34.1.703.g22d0c6ccf7-goog