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Subject[PATCH v3 07/15] [media] v4l: add V4L2_EVENT_BUF_QUEUED event
Date
From: Gustavo Padovan <gustavo.padovan@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.padovan@collabora.com>
---
Documentation/media/uapi/v4l/vidioc-dqevent.rst | 23 +++++++++++++++++++++++
Documentation/media/videodev2.h.rst.exceptions | 1 +
include/uapi/linux/videodev2.h | 11 +++++++++++
3 files changed, 35 insertions(+)

diff --git a/Documentation/media/uapi/v4l/vidioc-dqevent.rst b/Documentation/media/uapi/v4l/vidioc-dqevent.rst
index fcd9c933870d..55f9dbdca6ec 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 +341,25 @@ 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.
+ * - __s32
+ - ``out_fence_fd``
+ - The out-fence file descriptor of the buffer that was queued to
+ the driver. It will signal when the buffer is ready, or if an
+ error happens.
+
+
+
+.. 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..e2ec0b66f490 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 +2211,15 @@ 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;
+ __s32 out_fence_fd;
+};
+
struct v4l2_event {
__u32 type;
union {
@@ -2218,6 +2228,7 @@ 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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