This patch adds an extended version of VIDIOC_DQEVENT that:
1) is Y2038 safe by using a __u64 for the timestamp
2) needs no compat32 conversion code
3) is able to handle control events from 64-bit control types
by changing the type of the minimum, maximum, step and default_value
field to __u64
All drivers and frameworks will be using this, and v4l2-ioctl.c would be the
only place where the old event ioctl and structs are used.
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
---
I chose to name this DQ_EXT_EVENT since the struct it dequeues is now called
v4l2_ext_event. This is also consistent with the names of the G/S/TRY_EXT_CTRLS
ioctls. An alternative could be VIDIOC_DQEXT_EVENT as that would be consistent
with the lack of _ between DQ and EVENT in the current ioctl. But somehow it
doesn't look right.
Changes since v1:
- rename ioctl from VIDIOC_DQEXTEVENT.
- move the reserved array up to right after the union: this will allow us to
extend the union into the reserved array if we ever need more than 64 bytes
for the event payload (suggested by Sakari).
---
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 9a920f071ff9..301e3678bdb0 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -2303,6 +2303,37 @@ struct v4l2_event {
__u32 reserved[8];
};
+struct v4l2_event_ext_ctrl {
+ __u32 changes;
+ __u32 type;
+ union {
+ __s32 value;
+ __s64 value64;
+ };
+ __s64 minimum;
+ __s64 maximum;
+ __s64 step;
+ __s64 default_value;
+ __u32 flags;
+};
+
+struct v4l2_ext_event {
+ __u32 type;
+ __u32 id;
+ union {
+ struct v4l2_event_vsync vsync;
+ struct v4l2_event_ext_ctrl ctrl;
+ struct v4l2_event_frame_sync frame_sync;
+ struct v4l2_event_src_change src_change;
+ struct v4l2_event_motion_det motion_det;
+ __u8 data[64];
+ } u;
+ __u32 reserved[8];
+ __u64 timestamp;
+ __u32 pending;
+ __u32 sequence;
+};
+
#define V4L2_EVENT_SUB_FL_SEND_INITIAL (1 << 0)
#define V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK (1 << 1)
@@ -2475,6 +2506,7 @@ struct v4l2_create_buffers {
#define VIDIOC_DBG_G_CHIP_INFO _IOWR('V', 102, struct v4l2_dbg_chip_info)
#define VIDIOC_QUERY_EXT_CTRL _IOWR('V', 103, struct v4l2_query_ext_ctrl)
+#define VIDIOC_DQ_EXT_EVENT _IOR('V', 104, struct v4l2_ext_event)
/* Reminder: when adding new ioctls please add support for them to
drivers/media/v4l2-core/v4l2-compat-ioctl32.c as well! */
