[media] v4l2-ctrls: add a notify callback

Sometimes platform/bridge drivers need to be notified when a control from
a sub-device changes value. In order to support this a notify callback was
added.
[dheitmueller@kernellabs.com: fix merge conflict in v4l2-ctrls.c]

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 57 insertions, 8 deletions

diff --git a/Documentation/video4linux/v4l2-controls.txt b/Documentation/video4linux/v4l2-controls.txt
index cfe52c798d74..676f87366025 100644
--- a/Documentation/video4linux/v4l2-controls.txt
+++ b/Documentation/video4linux/v4l2-controls.txt
@@ -715,14 +715,20 @@ a control of this type whenever the first control belonging to a new control
 class is added.
 
 
-Proposals for Extensions
-========================
+Adding Notify Callbacks
+=======================
+
+Sometimes the platform or bridge driver needs to be notified when a control
+from a sub-device driver changes. You can set a notify callback by calling
+this function:
 
-Some ideas for future extensions to the spec:
+void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl,
+        void (*notify)(struct v4l2_ctrl *ctrl, void *priv), void *priv);
 
-1) Add a V4L2_CTRL_FLAG_HEX to have values shown as hexadecimal instead of
-decimal. Useful for e.g. video_mute_yuv.
+Whenever the give control changes value the notify callback will be called
+with a pointer to the control and the priv pointer that was passed with
+v4l2_ctrl_notify. Note that the control's handler lock is held when the
+notify function is called.
 
-2) It is possible to mark in the controls array which controls have been
-successfully written and which failed by for example adding a bit to the
-control ID. Not sure if it is worth the effort, though.
+There can be only one notify function per control handler. Any attempt
+to set another notify function will cause a WARN_ON.
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index f6ee201d9347..fa02363e7db4 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1204,6 +1204,8 @@ static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
                 send_event(fh, ctrl,
                         (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) |
                         (update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
+                if (ctrl->call_notify && changed && ctrl->handler->notify)
+                        ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
         }
 }
 
@@ -2725,6 +2727,22 @@ int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
 }
 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl_int64);
 
+void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
+{
+        if (ctrl == NULL)
+                return;
+        if (notify == NULL) {
+                ctrl->call_notify = 0;
+                return;
+        }
+        if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
+                return;
+        ctrl->handler->notify = notify;
+        ctrl->handler->notify_priv = priv;
+        ctrl->call_notify = 1;
+}
+EXPORT_SYMBOL(v4l2_ctrl_notify);
+
 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
 {
         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 96509119f28f..c4cc04136074 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -53,6 +53,8 @@ struct v4l2_ctrl_ops {
         int (*s_ctrl)(struct v4l2_ctrl *ctrl);
 };
 
+typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
+
 /** struct v4l2_ctrl - The control structure.
   * @node:      The list node.
   * @ev_subs:   The list of control event subscriptions.
@@ -72,6 +74,8 @@ struct v4l2_ctrl_ops {
   *             set this flag directly.
   * @has_volatiles: If set, then one or more members of the cluster are volatile.
   *             Drivers should never touch this flag.
+  * @call_notify: If set, then call the handler's notify function whenever the
+  *             control's value changes.
   * @manual_mode_value: If the is_auto flag is set, then this is the value
   *             of the auto control that determines if that control is in
   *             manual mode. So if the value of the auto control equals this
@@ -119,6 +123,7 @@ struct v4l2_ctrl {
         unsigned int is_private:1;
         unsigned int is_auto:1;
         unsigned int has_volatiles:1;
+        unsigned int call_notify:1;
         unsigned int manual_mode_value:8;
 
         const struct v4l2_ctrl_ops *ops;
@@ -177,6 +182,10 @@ struct v4l2_ctrl_ref {
   *             control is needed multiple times, so this is a simple
   *             optimization.
   * @buckets:   Buckets for the hashing. Allows for quick control lookup.
+  * @notify:    A notify callback that is called whenever the control changes value.
+  *             Note that the handler's lock is held when the notify function
+  *             is called!
+  * @notify_priv: Passed as argument to the v4l2_ctrl notify callback.
   * @nr_of_buckets: Total number of buckets in the array.
   * @error:     The error code of the first failed control addition.
   */
@@ -187,6 +196,8 @@ struct v4l2_ctrl_handler {
         struct list_head ctrl_refs;
         struct v4l2_ctrl_ref *cached;
         struct v4l2_ctrl_ref **buckets;
+        v4l2_ctrl_notify_fnc notify;
+        void *notify_priv;
         u16 nr_of_buckets;
         int error;
 };
@@ -525,6 +536,20 @@ static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl)
         mutex_unlock(ctrl->handler->lock);
 }
 
+/** v4l2_ctrl_notify() - Function to set a notify callback for a control.
+  * @ctrl:      The control.
+  * @notify:    The callback function.
+  * @priv:      The callback private handle, passed as argument to the callback.
+  *
+  * This function sets a callback function for the control. If @ctrl is NULL,
+  * then it will do nothing. If @notify is NULL, then the notify callback will
+  * be removed.
+  *
+  * There can be only one notify. If another already exists, then a WARN_ON
+  * will be issued and the function will do nothing.
+  */
+void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv);
+
 /** v4l2_ctrl_g_ctrl() - Helper function to get the control's value from within a driver.
   * @ctrl:      The control.
   *