All the entities must have a unique name. We can have a descriptive and
unique name by appending the function to their terminal link.
This is even resilient 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@xxxxxxxxxxxx>
---
drivers/media/usb/uvc/uvc_driver.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 058d28a0344b..8efbde981480 100644
--- 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 __maybe_unused *name;
int ret;
/* Initialize the video buffers queue. */
@@ -2221,17 +2222,29 @@ 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;
}
+ /*
+ * Many userspace applications identify the device with vdev->name, so
+ * we cannot change its name for its function.
+ */
strscpy(vdev->name, dev->name, sizeof(vdev->name));
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ vdev->entity.name = devm_kasprintf(&stream->intf->dev, GFP_KERNEL,
+ "%s %u", name, stream->header.bTerminalLink);
+#endif
+
/*
* Set the driver data before calling video_register_device, otherwise
* the file open() handler might race us.
--
2.34.1.400.ga245620fadb-goog
