[media] ov7670: implement VIDIOC_ENUM_FRAMEINTERVALS
Inquiring minds (and gstreamer) want to know.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c
index 089013e..ffccac5 100644
--- a/drivers/media/video/ov7670.c
+++ b/drivers/media/video/ov7670.c
@@ -887,15 +887,29 @@
}
+/*
+ * Frame intervals. Since frame rates are controlled with the clock
+ * divider, we can only do 30/n for integer n values. So no continuous
+ * or stepwise options. Here we just pick a handful of logical values.
+ */
+
+static int ov7670_frame_rates[] = { 30, 15, 10, 5, 1 };
+
+static int ov7670_enum_frameintervals(struct v4l2_subdev *sd,
+ struct v4l2_frmivalenum *interval)
+{
+ if (interval->index >= ARRAY_SIZE(ov7670_frame_rates))
+ return -EINVAL;
+ interval->type = V4L2_FRMIVAL_TYPE_DISCRETE;
+ interval->discrete.numerator = 1;
+ interval->discrete.denominator = ov7670_frame_rates[interval->index];
+ return 0;
+}
/*
* Code for dealing with controls.
*/
-
-
-
-
static int ov7670_store_cmatrix(struct v4l2_subdev *sd,
int matrix[CMATRIX_LEN])
{
@@ -1438,6 +1452,7 @@
.s_mbus_fmt = ov7670_s_mbus_fmt,
.s_parm = ov7670_s_parm,
.g_parm = ov7670_g_parm,
+ .enum_frameintervals = ov7670_enum_frameintervals,
};
static const struct v4l2_subdev_ops ov7670_ops = {