media: uvcvideo: Set unique vdev name based in type

All the entities must have a unique name. We can have a descriptive and
unique name by appending the function and the entity->id.

This is even resilent to 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>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 058d28a0344b12cbe874c6dd224f1fd42922bb9a..7c007426e0827ed17ebefca336e45ccf5d561deb 100644 (file)
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2193,6 +2193,7 @@ int uvc_register_video_device(struct uvc_device *dev,
                              const struct v4l2_file_operations *fops,
                              const struct v4l2_ioctl_ops *ioctl_ops)
 {
+       const char *name;
        int ret;
 
        /* Initialize the video buffers queue. */
@@ -2221,16 +2222,20 @@ 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;
+               name = "Video Capture";
                break;
        case V4L2_BUF_TYPE_VIDEO_OUTPUT:
                vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
+               name = "Video Output";
                break;
        case V4L2_BUF_TYPE_META_CAPTURE:
                vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
+               name = "Metadata";
                break;
        }
 
-       strscpy(vdev->name, dev->name, sizeof(vdev->name));
+       snprintf(vdev->name, sizeof(vdev->name), "%s %u", name,
+                stream->header.bTerminalLink);
 
        /*
         * Set the driver data before calling video_register_device, otherwise