[media] v4l: Make video_device inherit from media_entity

V4L2 devices are media entities. As such they need to inherit from
(include) the media_entity structure.

When registering/unregistering the device, the media entity is
automatically registered/unregistered. The entity is acquired on device
open and released on device close.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 87 insertions, 7 deletions

diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index 7de55cfae04e..062708169def 100644
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -71,6 +71,10 @@ sub-device instances, the video_device struct stores V4L2 device node data
 and in the future a v4l2_fh struct will keep track of filehandle instances
 (this is not yet implemented).
 
+The V4L2 framework also optionally integrates with the media framework. If a
+driver sets the struct v4l2_device mdev field, sub-devices and video nodes
+will automatically appear in the media framework as entities.
+
 
 struct v4l2_device
 ------------------
@@ -84,11 +88,14 @@ You must register the device instance:
         v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev);
 
 Registration will initialize the v4l2_device struct. If the dev->driver_data
-field is NULL, it will be linked to v4l2_dev. Drivers that use the media
-device framework in addition to the V4L2 framework need to set
+field is NULL, it will be linked to v4l2_dev.
+
+Drivers that want integration with the media device framework need to set
 dev->driver_data manually to point to the driver-specific device structure
 that embed the struct v4l2_device instance. This is achieved by a
-dev_set_drvdata() call before registering the V4L2 device instance.
+dev_set_drvdata() call before registering the V4L2 device instance. They must
+also set the struct v4l2_device mdev field to point to a properly initialized
+and registered media_device instance.
 
 If v4l2_dev->name is empty then it will be set to a value derived from dev
 (driver name followed by the bus_id, to be precise). If you set it up before
@@ -530,6 +537,21 @@ If you use v4l2_ioctl_ops, then you should set either .unlocked_ioctl or
 The v4l2_file_operations struct is a subset of file_operations. The main
 difference is that the inode argument is omitted since it is never used.
 
+If integration with the media framework is needed, you must initialize the
+media_entity struct embedded in the video_device struct (entity field) by
+calling media_entity_init():
+
+        struct media_pad *pad = &my_vdev->pad;
+        int err;
+
+        err = media_entity_init(&vdev->entity, 1, pad, 0);
+
+The pads array must have been previously initialized. There is no need to
+manually set the struct media_entity type and name fields.
+
+A reference to the entity will be automatically acquired/released when the
+video device is opened/closed.
+
 v4l2_file_operations and locking
 --------------------------------
 
@@ -559,6 +581,9 @@ for you.
                 return err;
         }
 
+If the v4l2_device parent device has a non-NULL mdev field, the video device
+entity will be automatically registered with the media device.
+
 Which device is registered depends on the type argument. The following
 types exist:
 
@@ -634,6 +659,13 @@ release, of course) will return an error as well.
 When the last user of the video device node exits, then the vdev->release()
 callback is called and you can do the final cleanup there.
 
+Don't forget to cleanup the media entity associated with the video device if
+it has been initialized:
+
+        media_entity_cleanup(&vdev->entity);
+
+This can be done from the release callback.
+
 
 video_device helper functions
 -----------------------------
diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index abe04ef38066..e405b8094b94 100644
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -303,6 +303,9 @@ static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
 static int v4l2_open(struct inode *inode, struct file *filp)
 {
         struct video_device *vdev;
+#if defined(CONFIG_MEDIA_CONTROLLER)
+        struct media_entity *entity = NULL;
+#endif
         int ret = 0;
 
         /* Check if the video device is available */
@@ -316,6 +319,16 @@ static int v4l2_open(struct inode *inode, struct file *filp)
         /* and increase the device refcount */
         video_get(vdev);
         mutex_unlock(&videodev_lock);
+#if defined(CONFIG_MEDIA_CONTROLLER)
+        if (vdev->v4l2_dev && vdev->v4l2_dev->mdev) {
+                entity = media_entity_get(&vdev->entity);
+                if (!entity) {
+                        ret = -EBUSY;
+                        video_put(vdev);
+                        return ret;
+                }
+        }
+#endif
         if (vdev->fops->open) {
                 if (vdev->lock && mutex_lock_interruptible(vdev->lock)) {
                         ret = -ERESTARTSYS;
@@ -331,8 +344,13 @@ static int v4l2_open(struct inode *inode, struct file *filp)
 
 err:
         /* decrease the refcount in case of an error */
-        if (ret)
+        if (ret) {
+#if defined(CONFIG_MEDIA_CONTROLLER)
+                if (vdev->v4l2_dev && vdev->v4l2_dev->mdev)
+                        media_entity_put(entity);
+#endif
                 video_put(vdev);
+        }
         return ret;
 }
 
@@ -349,7 +367,10 @@ static int v4l2_release(struct inode *inode, struct file *filp)
                 if (vdev->lock)
                         mutex_unlock(vdev->lock);
         }
-
+#if defined(CONFIG_MEDIA_CONTROLLER)
+        if (vdev->v4l2_dev && vdev->v4l2_dev->mdev)
+                media_entity_put(&vdev->entity);
+#endif
         /* decrease the refcount unconditionally since the release()
            return value is ignored. */
         video_put(vdev);
@@ -585,12 +606,27 @@ int __video_register_device(struct video_device *vdev, int type, int nr,
         if (nr != -1 && nr != vdev->num && warn_if_nr_in_use)
                 printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__,
                         name_base, nr, video_device_node_name(vdev));
-
-        /* Part 5: Activate this minor. The char device can now be used. */
+#if defined(CONFIG_MEDIA_CONTROLLER)
+        /* Part 5: Register the entity. */
+        if (vdev->v4l2_dev && vdev->v4l2_dev->mdev) {
+                vdev->entity.type = MEDIA_ENT_T_DEVNODE_V4L;
+                vdev->entity.name = vdev->name;
+                vdev->entity.v4l.major = VIDEO_MAJOR;
+                vdev->entity.v4l.minor = vdev->minor;
+                ret = media_device_register_entity(vdev->v4l2_dev->mdev,
+                        &vdev->entity);
+                if (ret < 0)
+                        printk(KERN_WARNING
+                               "%s: media_device_register_entity failed\n",
+                               __func__);
+        }
+#endif
+        /* Part 6: Activate this minor. The char device can now be used. */