[PATCH v3 7/8] media: uvcvideo: Set a different name for the metadata entity

From: Ricardo Ribalda <ribalda@chromium.org>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Tomasz Figa <tfiga@chromium.org>,
	linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
	senozhatsky@chromium.org, Hans Verkuil <hverkuil@xs4all.nl>
Cc: Ricardo Ribalda <ribalda@chromium.org>
Subject: [PATCH v3 7/8] media: uvcvideo: Set a different name for the metadata entity
Date: Fri, 12 Mar 2021 13:48:29 +0100	[thread overview]
Message-ID: <20210312124830.1344255-8-ribalda@chromium.org> (raw)
In-Reply-To: <20210312124830.1344255-1-ribalda@chromium.org>

All the entities must have a unique name. And now that we are at it, we
append the entity->id to the name to avoid collisions on multi-chain
devices.

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

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_driver.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 35873cf2773d..6c928e708615 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2154,6 +2154,18 @@ static void uvc_unregister_video(struct uvc_device *dev)
 #endif
 }
 
+static int uvc_oterm_id(struct uvc_video_chain *chain)
+{
+	struct uvc_entity *entity;
+
+	list_for_each_entry(entity, &chain->entities, chain) {
+		if (UVC_ENTITY_IS_OTERM(entity))
+			return entity->id;
+	}
+
+	return -1;
+}
+
 int uvc_register_video_device(struct uvc_device *dev,
 			      struct uvc_streaming *stream,
 			      struct video_device *vdev,
@@ -2162,6 +2174,8 @@ int uvc_register_video_device(struct uvc_device *dev,
 			      const struct v4l2_file_operations *fops,
 			      const struct v4l2_ioctl_ops *ioctl_ops)
 {
+	char prefix[sizeof(vdev->name) - 9];
+	const char *suffix;
 	int ret;
 
 	/* Initialize the video buffers queue. */
@@ -2190,16 +2204,21 @@ int uvc_register_video_device(struct uvc_device *dev,
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 	default:
 		vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+		suffix = "video";
 		break;
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 		vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
+		suffix = "out";
 		break;
 	case V4L2_BUF_TYPE_META_CAPTURE:
 		vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
+		suffix = "meta";
 		break;
 	}
 
-	strscpy(vdev->name, dev->name, sizeof(vdev->name));
+	strscpy(prefix, dev->name, sizeof(prefix));
+	snprintf(vdev->name, sizeof(vdev->name), "%s-%d %s", prefix,
+		 uvc_oterm_id(stream->chain), suffix);
 
 	/*
 	 * Set the driver data before calling video_register_device, otherwise
-- 
2.31.0.rc2.261.g7f71774620-goog

