linux-kernel - [PATCH v7 3/5] media: uvcvideo: Introduce dev->meta

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Message-Id: <20250617-uvc-meta-v7-3-9c50623e2286@chromium.org>
Date: Tue, 17 Jun 2025 14:42:24 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Guennadi Liakhovetski <guennadi.liakhovetski@...el.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Hans de Goede <hansg@...nel.org>, Hans de Goede <hansg@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-usb@...r.kernel.org, Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH v7 3/5] media: uvcvideo: Introduce dev->meta_formats

Right now, there driver supports devices with one or two metadata
formats. Prepare it to support more than two metadata formats.

This is achieved with the introduction of a new field `meta_formats`,
that contains the array of metadata formats supported by the device, in
the order expected by userspace.

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_driver.c   |  7 ++++++
 drivers/media/usb/uvc/uvc_metadata.c | 46 ++++++++++++++++++++++++++++++------
 drivers/media/usb/uvc/uvcvideo.h     |  2 ++
 3 files changed, 48 insertions(+), 7 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 62eb45435d8bec5c955720ecb46fb8936871e6cc..9de5abb43e19d9e876cddc5d7124592953db89ac 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2315,6 +2315,13 @@ static int uvc_probe(struct usb_interface *intf,
 		goto error;
 	}
 
+	ret = uvc_meta_init(dev);
+	if (ret < 0) {
+		dev_err(&dev->udev->dev,
+			"Error initializing the metadata formats (%d)\n", ret);
+		goto error;
+	}
+
 	if (dev->quirks & UVC_QUIRK_NO_RESET_RESUME)
 		udev->quirks &= ~USB_QUIRK_RESET_RESUME;
 
diff --git a/drivers/media/usb/uvc/uvc_metadata.c b/drivers/media/usb/uvc/uvc_metadata.c
index 82de7781f5b6b70c5ba16bcba9e0741231231904..bc84e849174397f41d1e20bf890a876eeb5a9c67 100644
--- a/drivers/media/usb/uvc/uvc_metadata.c
+++ b/drivers/media/usb/uvc/uvc_metadata.c
@@ -64,14 +64,20 @@ static int uvc_meta_v4l2_try_format(struct file *file, void *fh,
 	struct uvc_device *dev = stream->dev;
 	struct v4l2_meta_format *fmt = &format->fmt.meta;
 	u32 fmeta = fmt->dataformat;
+	u32 i;
 
 	if (format->type != vfh->vdev->queue->type)
 		return -EINVAL;
 
+	for (i = 0; (fmeta != dev->meta_formats[i]) && dev->meta_formats[i];
+	     i++)
+		;
+	if (!dev->meta_formats[i])
+		fmeta = V4L2_META_FMT_UVC;
+
 	memset(fmt, 0, sizeof(*fmt));
 
-	fmt->dataformat = fmeta == dev->info->meta_format
-			? fmeta : V4L2_META_FMT_UVC;
+	fmt->dataformat = fmeta;
 	fmt->buffersize = UVC_METADATA_BUF_SIZE;
 
 	return 0;
@@ -112,17 +118,21 @@ static int uvc_meta_v4l2_enum_formats(struct file *file, void *fh,
 	struct v4l2_fh *vfh = file->private_data;
 	struct uvc_streaming *stream = video_get_drvdata(vfh->vdev);
 	struct uvc_device *dev = stream->dev;
-	u32 index = fdesc->index;
+	u32 i;
+
+	if (fdesc->type != vfh->vdev->queue->type)
+		return -EINVAL;
 
-	if (fdesc->type != vfh->vdev->queue->type ||
-	    index > 1U || (index && !dev->info->meta_format))
+	for (i = 0; (i < fdesc->index) && dev->meta_formats[i]; i++)
+		;
+	if (!dev->meta_formats[i])
 		return -EINVAL;
 
 	memset(fdesc, 0, sizeof(*fdesc));
 
 	fdesc->type = vfh->vdev->queue->type;
-	fdesc->index = index;
-	fdesc->pixelformat = index ? dev->info->meta_format : V4L2_META_FMT_UVC;
+	fdesc->index = i;
+	fdesc->pixelformat = dev->meta_formats[i];
 
 	return 0;
 }
@@ -174,3 +184,25 @@ int uvc_meta_register(struct uvc_streaming *stream)
 					 V4L2_BUF_TYPE_META_CAPTURE,
 					 &uvc_meta_fops, &uvc_meta_ioctl_ops);
 }
+
+int uvc_meta_init(struct uvc_device *dev)
+{
+	static const u32 uvch_only[] = {V4L2_META_FMT_UVC, 0};
+	static const u32 d4xx_format[] = {V4L2_META_FMT_UVC, V4L2_META_FMT_D4XX,
+					  0};
+
+	switch (dev->info->meta_format) {
+	case V4L2_META_FMT_D4XX:
+		dev->meta_formats = d4xx_format;
+		break;
+	case 0:
+		dev->meta_formats = uvch_only;
+		break;
+	default:
+		dev_err(&dev->udev->dev, "Unknown metadata format 0x%x\n",
+			dev->info->meta_format);
+		return -EINVAL;
+	}
+
+	return 0;
+}
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 11d6e3c2ebdfbabd7bbe5722f88ff85f406d9bb6..502f1d5608637cd28ce6f01aee31c4f5df160081 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -581,6 +581,7 @@ struct uvc_device {
 	char name[32];
 
 	const struct uvc_device_info *info;
+	const u32 *meta_formats; /* Zero-ended list of meta formats */
 
 	atomic_t nmappings;
 
@@ -751,6 +752,7 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit,
 void uvc_video_clock_update(struct uvc_streaming *stream,
 			    struct vb2_v4l2_buffer *vbuf,
 			    struct uvc_buffer *buf);
+int uvc_meta_init(struct uvc_device *dev);
 int uvc_meta_register(struct uvc_streaming *stream);
 
 int uvc_register_video_device(struct uvc_device *dev,

-- 
2.50.0.rc2.692.g299adb8693-goog