[media] v4l: Helper function for obtaining timestamps
v4l2_get_timestamp() produces a monotonic timestamp but unlike
ktime_get_ts(), it uses struct timeval instead of struct timespec, saving
the drivers the conversion job when getting timestamps for v4l2_buffer's
timestamp field.
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
index 380ddd89..614316f 100644
--- a/drivers/media/v4l2-core/v4l2-common.c
+++ b/drivers/media/v4l2-core/v4l2-common.c
@@ -978,3 +978,13 @@
return best;
}
EXPORT_SYMBOL_GPL(v4l2_find_nearest_format);
+
+void v4l2_get_timestamp(struct timeval *tv)
+{
+ struct timespec ts;
+
+ ktime_get_ts(&ts);
+ tv->tv_sec = ts.tv_sec;
+ tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC;
+}
+EXPORT_SYMBOL_GPL(v4l2_get_timestamp);