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[RFC,2/4] v4l: Helper function for obtaining timestamps

Message ID 1351102583-682-2-git-send-email-sakari.ailus@iki.fi (mailing list archive)
State New, archived
Headers show

Commit Message

Sakari Ailus Oct. 24, 2012, 6:16 p.m. UTC 
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>
---
 drivers/media/v4l2-core/v4l2-common.c |   10 ++++++++++
 include/media/v4l2-common.h           |    2 ++
 2 files changed, 12 insertions(+), 0 deletions(-)
diff mbox

Patch

diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
index f995dd3..cbace52 100644
--- a/drivers/media/v4l2-core/v4l2-common.c
+++ b/drivers/media/v4l2-core/v4l2-common.c
@@ -979,3 +979,13 @@  const struct v4l2_frmsize_discrete *v4l2_find_nearest_format(
 	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);
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
index 1a0b2db..ec7c9c0 100644
--- a/include/media/v4l2-common.h
+++ b/include/media/v4l2-common.h
@@ -225,4 +225,6 @@  bool v4l2_detect_gtf(unsigned frame_height, unsigned hfreq, unsigned vsync,
 
 struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait);
 
+void v4l2_get_timestamp(struct timeval *tv);
+
 #endif /* V4L2_COMMON_H_ */