From: Gustavo Padovan <gustavo.pado...@collabora.com>

Add a new event the userspace can subscribe to receive notifications
when a buffer is queued onto the driver. The event provides the index of
the queued buffer.

v2: - Add missing Documentation (Mauro)

Signed-off-by: Gustavo Padovan <gustavo.pado...@collabora.com>
---
 Documentation/media/uapi/v4l/vidioc-dqevent.rst | 18 ++++++++++++++++++
 Documentation/media/videodev2.h.rst.exceptions  |  1 +
 include/uapi/linux/videodev2.h                  | 10 ++++++++++
 3 files changed, 29 insertions(+)

diff --git a/Documentation/media/uapi/v4l/vidioc-dqevent.rst 
b/Documentation/media/uapi/v4l/vidioc-dqevent.rst
index fcd9c933870d..362d82153312 100644
--- a/Documentation/media/uapi/v4l/vidioc-dqevent.rst
+++ b/Documentation/media/uapi/v4l/vidioc-dqevent.rst
@@ -78,6 +78,10 @@ call.
       - ``src_change``
       - Event data for event V4L2_EVENT_SOURCE_CHANGE.
     * -
+      - struct :c:type:`v4l2_event_buf_queued`
+      - ``buf_queued``
+      - Event data for event V4L2_EVENT_BUF_QUEUED.
+    * -
       - __u8
       - ``data``\ [64]
       - Event data. Defined by the event type. The union should be used to
@@ -337,6 +341,20 @@ call.
        each cell in the motion detection grid, then that all cells are
        automatically assigned to the default region 0.
 
+.. c:type:: v4l2_event_buf_queued
+
+.. flat-table:: struct v4l2_event_buf_queued
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u32
+      - ``index``
+      - The index of the buffer that was queued to the driver.
+
+
+
+.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
 
 
 .. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
diff --git a/Documentation/media/videodev2.h.rst.exceptions 
b/Documentation/media/videodev2.h.rst.exceptions
index a5cb0a8686ac..4e014b1d0317 100644
--- a/Documentation/media/videodev2.h.rst.exceptions
+++ b/Documentation/media/videodev2.h.rst.exceptions
@@ -462,6 +462,7 @@ replace define V4L2_EVENT_CTRL event-type
 replace define V4L2_EVENT_FRAME_SYNC event-type
 replace define V4L2_EVENT_SOURCE_CHANGE event-type
 replace define V4L2_EVENT_MOTION_DET event-type
+replace define V4L2_EVENT_BUF_QUEUED event-type
 replace define V4L2_EVENT_PRIVATE_START event-type
 
 replace define V4L2_EVENT_CTRL_CH_VALUE ctrl-changes-flags
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index e5abab9a908c..4a7a68ecc709 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -2158,6 +2158,7 @@ struct v4l2_streamparm {
 #define V4L2_EVENT_FRAME_SYNC                  4
 #define V4L2_EVENT_SOURCE_CHANGE               5
 #define V4L2_EVENT_MOTION_DET                  6
+#define V4L2_EVENT_BUF_QUEUED                  7
 #define V4L2_EVENT_PRIVATE_START               0x08000000
 
 /* Payload for V4L2_EVENT_VSYNC */
@@ -2210,6 +2211,14 @@ struct v4l2_event_motion_det {
        __u32 region_mask;
 };
 
+/**
+ * struct v4l2_event_buf_queued - buffer queued in the driver event
+ * @index:             index of the buffer queued in the driver
+ */
+struct v4l2_event_buf_queued {
+       __u32 index;
+};
+
 struct v4l2_event {
        __u32                           type;
        union {
@@ -2218,6 +2227,7 @@ struct v4l2_event {
                struct v4l2_event_frame_sync    frame_sync;
                struct v4l2_event_src_change    src_change;
                struct v4l2_event_motion_det    motion_det;
+               struct v4l2_event_buf_queued    buf_queued;
                __u8                            data[64];
        } u;
        __u32                           pending;
-- 
2.13.5

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