V4L/DVB (13148): uvcvideo: Handle V4L2_CTRL_TYPE_BUTTON control type in VIDIOC_QUERYCTRL

Return minimum, maximum and step set to 0 without querying the hardware.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/media/video/uvc/uvc_ctrl.c b/drivers/media/video/uvc/uvc_ctrl.c
index 1b89735e62fd..6f1487fc3d7c 100644
--- a/drivers/media/video/uvc/uvc_ctrl.c
+++ b/drivers/media/video/uvc/uvc_ctrl.c
@@ -826,6 +826,13 @@ int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
                 ret = 0;
                 goto out;
 
+        case V4L2_CTRL_TYPE_BUTTON:
+                v4l2_ctrl->minimum = 0;
+                v4l2_ctrl->maximum = 0;
+                v4l2_ctrl->step = 0;
+                ret = 0;
+                goto out;
+
         default:
                 break;
         }