[media] vivi: add v4l2_ctrl_modify_range test case

Update the brighness range depending on the selected input. Useful for
testing control range events.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/media/platform/vivi.c b/drivers/media/platform/vivi.c
index c46d2e8677a5..85bc314382d3 100644
--- a/drivers/media/platform/vivi.c
+++ b/drivers/media/platform/vivi.c
@@ -1093,6 +1093,15 @@ static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
                 return 0;
 
         dev->input = i;
+        /*
+         * Modify the brightness range depending on the input.
+         * This makes it easy to use vivi to test if applications can
+         * handle control range modifications and is also how this is
+         * typically used in practice as different inputs may be hooked
+         * up to different receivers with different control ranges.
+         */
+        v4l2_ctrl_modify_range(dev->brightness,
+                        128 * i, 255 + 128 * i, 1, 127 + 128 * i);
         precalculate_bars(dev);
         precalculate_line(dev);
         return 0;