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path: root/drivers/media/video/v4l2-device.c
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Diffstat (limited to 'drivers/media/video/v4l2-device.c')
-rw-r--r--drivers/media/video/v4l2-device.c101
1 files changed, 92 insertions, 9 deletions
diff --git a/drivers/media/video/v4l2-device.c b/drivers/media/video/v4l2-device.c
index ce64fe16bc60..5aeaf876ba9b 100644
--- a/drivers/media/video/v4l2-device.c
+++ b/drivers/media/video/v4l2-device.c
@@ -36,6 +36,8 @@ int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev)
INIT_LIST_HEAD(&v4l2_dev->subdevs);
spin_lock_init(&v4l2_dev->lock);
mutex_init(&v4l2_dev->ioctl_lock);
+ v4l2_prio_init(&v4l2_dev->prio);
+ kref_init(&v4l2_dev->ref);
v4l2_dev->dev = dev;
if (dev == NULL) {
/* If dev == NULL, then name must be filled in by the caller */
@@ -47,13 +49,27 @@ int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev)
if (!v4l2_dev->name[0])
snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %s",
dev->driver->name, dev_name(dev));
- if (dev_get_drvdata(dev))
- v4l2_warn(v4l2_dev, "Non-NULL drvdata on register\n");
- dev_set_drvdata(dev, v4l2_dev);
+ if (!dev_get_drvdata(dev))
+ dev_set_drvdata(dev, v4l2_dev);
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_device_register);
+static void v4l2_device_release(struct kref *ref)
+{
+ struct v4l2_device *v4l2_dev =
+ container_of(ref, struct v4l2_device, ref);
+
+ if (v4l2_dev->release)
+ v4l2_dev->release(v4l2_dev);
+}
+
+int v4l2_device_put(struct v4l2_device *v4l2_dev)
+{
+ return kref_put(&v4l2_dev->ref, v4l2_device_release);
+}
+EXPORT_SYMBOL_GPL(v4l2_device_put);
+
int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename,
atomic_t *instance)
{
@@ -72,10 +88,12 @@ EXPORT_SYMBOL_GPL(v4l2_device_set_name);
void v4l2_device_disconnect(struct v4l2_device *v4l2_dev)
{
- if (v4l2_dev->dev) {
+ if (v4l2_dev->dev == NULL)
+ return;
+
+ if (dev_get_drvdata(v4l2_dev->dev) == v4l2_dev)
dev_set_drvdata(v4l2_dev->dev, NULL);
- v4l2_dev->dev = NULL;
- }
+ v4l2_dev->dev = NULL;
}
EXPORT_SYMBOL_GPL(v4l2_device_disconnect);
@@ -117,23 +135,30 @@ void v4l2_device_unregister(struct v4l2_device *v4l2_dev)
EXPORT_SYMBOL_GPL(v4l2_device_unregister);
int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
- struct v4l2_subdev *sd)
+ struct v4l2_subdev *sd)
{
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ struct media_entity *entity = &sd->entity;
+#endif
int err;
/* Check for valid input */
if (v4l2_dev == NULL || sd == NULL || !sd->name[0])
return -EINVAL;
+
/* Warn if we apparently re-register a subdev */
WARN_ON(sd->v4l2_dev != NULL);
+
if (!try_module_get(sd->owner))
return -ENODEV;
+
sd->v4l2_dev = v4l2_dev;
if (sd->internal_ops && sd->internal_ops->registered) {
err = sd->internal_ops->registered(sd);
if (err)
return err;
}
+
/* This just returns 0 if either of the two args is NULL */
err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler);
if (err) {
@@ -141,24 +166,82 @@ int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
sd->internal_ops->unregistered(sd);
return err;
}
+
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ /* Register the entity. */
+ if (v4l2_dev->mdev) {
+ err = media_device_register_entity(v4l2_dev->mdev, entity);
+ if (err < 0) {
+ if (sd->internal_ops && sd->internal_ops->unregistered)
+ sd->internal_ops->unregistered(sd);
+ module_put(sd->owner);
+ return err;
+ }
+ }
+#endif
+
spin_lock(&v4l2_dev->lock);
list_add_tail(&sd->list, &v4l2_dev->subdevs);
spin_unlock(&v4l2_dev->lock);
+
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_device_register_subdev);
+int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
+{
+ struct video_device *vdev;
+ struct v4l2_subdev *sd;
+ int err;
+
+ /* Register a device node for every subdev marked with the
+ * V4L2_SUBDEV_FL_HAS_DEVNODE flag.
+ */
+ list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
+ if (!(sd->flags & V4L2_SUBDEV_FL_HAS_DEVNODE))
+ continue;
+
+ vdev = &sd->devnode;
+ strlcpy(vdev->name, sd->name, sizeof(vdev->name));
+ vdev->v4l2_dev = v4l2_dev;
+ vdev->fops = &v4l2_subdev_fops;
+ vdev->release = video_device_release_empty;
+ err = __video_register_device(vdev, VFL_TYPE_SUBDEV, -1, 1,
+ sd->owner);
+ if (err < 0)
+ return err;
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ sd->entity.v4l.major = VIDEO_MAJOR;
+ sd->entity.v4l.minor = vdev->minor;
+#endif
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_device_register_subdev_nodes);
+
void v4l2_device_unregister_subdev(struct v4l2_subdev *sd)
{
+ struct v4l2_device *v4l2_dev;
+
/* return if it isn't registered */
if (sd == NULL || sd->v4l2_dev == NULL)
return;
- spin_lock(&sd->v4l2_dev->lock);
+
+ v4l2_dev = sd->v4l2_dev;
+
+ spin_lock(&v4l2_dev->lock);
list_del(&sd->list);
- spin_unlock(&sd->v4l2_dev->lock);
+ spin_unlock(&v4l2_dev->lock);
+
if (sd->internal_ops && sd->internal_ops->unregistered)
sd->internal_ops->unregistered(sd);
sd->v4l2_dev = NULL;
+
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ if (v4l2_dev->mdev)
+ media_device_unregister_entity(&sd->entity);
+#endif
+ video_unregister_device(&sd->devnode);
module_put(sd->owner);
}
EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev);