[PATCH v2 19/22] media: au0828-core register entity_notify hook

[Shuah Khan]

Register entity_notify async hook to create links
between existing bridge driver entities and a newly
added non-bridge driver entities. For example, this
handler creates link between V4L decoder entity and
ALSA mixer entity.

Signed-off-by: Shuah Khan <shua...@osg.samsung.com>
---
 drivers/media/usb/au0828/au0828-core.c | 43 ++++++++++++++++++++++++++++++++--
 drivers/media/usb/au0828/au0828.h      |  1 +
 2 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/au0828/au0828-core.c 
b/drivers/media/usb/au0828/au0828-core.c
index 92d22ed..4c90f28 100644
--- a/drivers/media/usb/au0828/au0828-core.c
+++ b/drivers/media/usb/au0828/au0828-core.c
@@ -347,14 +347,42 @@ static int au0828_create_media_graph(struct au0828_dev 
*dev)
        return 0;
 }
 
+void au0828_media_graph_notify(struct media_entity *new, void *notify_data)
+{
+#ifdef CONFIG_MEDIA_CONTROLLER
+       struct au0828_dev *dev = (struct au0828_dev *) notify_data;
+       int ret;
+
+       if (!dev->decoder)
+               return;
+
+       switch (new->function) {
+       case MEDIA_ENT_F_AUDIO_MIXER:
+               ret = media_create_pad_link(dev->decoder,
+                                           AU8522_PAD_AUDIO_OUT,
+                                           new, 0,
+                                           MEDIA_LNK_FL_ENABLED);
+               if (ret)
+                       dev_err(&dev->usbdev->dev,
+                               "Mixer Pad Link Create Error: %d\n",
+                               ret);
+               break;
+       default:
+               break;
+       }
+#endif
+}
+
 static int au0828_media_device_register(struct au0828_dev *dev,
                                        struct usb_device *udev)
 {
 #ifdef CONFIG_MEDIA_CONTROLLER
        int ret;
 
-       if (dev->media_dev &&
-               !media_devnode_is_registered(&dev->media_dev->devnode)) {
+       if (!dev->media_dev)
+               return 0;
+
+       if (!media_devnode_is_registered(&dev->media_dev->devnode)) {
 
                /* register media device */
                ret = media_device_register(dev->media_dev);
@@ -364,6 +392,17 @@ static int au0828_media_device_register(struct au0828_dev 
*dev,
                        return ret;
                }
        }
+       /* register entity_notify callback */
+       dev->entity_notify.notify_data = (void *) dev;
+       dev->entity_notify.notify = (void *) au0828_media_graph_notify;
+       ret = media_device_register_entity_notify(dev->media_dev,
+                                                 &dev->entity_notify);
+       if (ret) {
+               dev_err(&udev->dev,
+                       "Media Device register entity_notify Error: %d\n",
+                       ret);
+               return ret;
+       }
 #endif
        return 0;
 }
diff --git a/drivers/media/usb/au0828/au0828.h 
b/drivers/media/usb/au0828/au0828.h
index 8276072..54379ec 100644
--- a/drivers/media/usb/au0828/au0828.h
+++ b/drivers/media/usb/au0828/au0828.h
@@ -283,6 +283,7 @@ struct au0828_dev {
        struct media_entity *decoder;
        struct media_entity input_ent[AU0828_MAX_INPUT];
        struct media_pad input_pad[AU0828_MAX_INPUT];
+       struct media_entity_notify entity_notify;
 #endif
 };
 
-- 
2.5.0