[media] uvcvideo: Register a v4l2_device

As a first step to the media controller integration register a
v4l2_device for each UVC control interface and make the video_device a
child of the v4l2_device.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 33 insertions, 2 deletions

diff --git a/drivers/media/video/uvc/uvc_driver.c b/drivers/media/video/uvc/uvc_driver.c
index 823f4b38974..0e8cd1fd870 100644
--- a/drivers/media/video/uvc/uvc_driver.c
+++ b/drivers/media/video/uvc/uvc_driver.c
@@ -1585,6 +1585,13 @@ static void uvc_delete(struct uvc_device *dev)
         uvc_status_cleanup(dev);
         uvc_ctrl_cleanup_device(dev);
 
+        if (dev->vdev.dev)
+                v4l2_device_unregister(&dev->vdev);
+#ifdef CONFIG_MEDIA_CONTROLLER
+        if (media_devnode_is_registered(&dev->mdev.devnode))
+                media_device_unregister(&dev->mdev);
+#endif
+
         list_for_each_safe(p, n, &dev->chains) {
                 struct uvc_video_chain *chain;
                 chain = list_entry(p, struct uvc_video_chain, list);
@@ -1682,7 +1689,7 @@ static int uvc_register_video(struct uvc_device *dev,
          * unregistered before the reference is released, so we don't need to
          * get another one.
          */
-        vdev->parent = &dev->intf->dev;
+        vdev->v4l2_dev = &dev->vdev;
         vdev->fops = &uvc_fops;
         vdev->release = uvc_release;
         strlcpy(vdev->name, dev->name, sizeof vdev->name);
@@ -1814,6 +1821,24 @@ static int uvc_probe(struct usb_interface *intf,
                         "linux-uvc-devel mailing list.\n");
         }
 
+        /* Register the media and V4L2 devices. */
+#ifdef CONFIG_MEDIA_CONTROLLER
+        dev->mdev.dev = &intf->dev;
+        strlcpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));
+        if (udev->serial)
+                strlcpy(dev->mdev.serial, udev->serial,
+                        sizeof(dev->mdev.serial));
+        strcpy(dev->mdev.bus_info, udev->devpath);
+        dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
+        dev->mdev.driver_version = DRIVER_VERSION_NUMBER;
+        if (media_device_register(&dev->mdev) < 0)
+                goto error;
+
+        dev->vdev.mdev = &dev->mdev;
+#endif
+        if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)
+                goto error;
+
         /* Initialize controls. */
         if (uvc_ctrl_init_device(dev) < 0)
                 goto error;
@@ -1822,7 +1847,7 @@ static int uvc_probe(struct usb_interface *intf,
         if (uvc_scan_device(dev) < 0)
                 goto error;
 
-        /* Register video devices. */
+        /* Register video device nodes. */
         if (uvc_register_chains(dev) < 0)
                 goto error;
 
diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h
index 7cf224bae2e..aab7508f2bd 100644
--- a/drivers/media/video/uvc/uvcvideo.h
+++ b/drivers/media/video/uvc/uvcvideo.h
@@ -100,6 +100,8 @@ struct uvc_xu_control {
 #include <linux/poll.h>
 #include <linux/usb/video.h>
 #include <linux/uvcvideo.h>
+#include <media/media-device.h>
+#include <media/v4l2-device.h>
 
 /* --------------------------------------------------------------------------
  * UVC constants
@@ -504,6 +506,10 @@ struct uvc_device {
         atomic_t nmappings;
 
         /* Video control interface */
+#ifdef CONFIG_MEDIA_CONTROLLER
+        struct media_device mdev;
+#endif
+        struct v4l2_device vdev;
         __u16 uvc_version;
         __u32 clock_frequency;