[media] uvcvideo: add support for VIDIOC_QUERY_EXT_CTRL

Add support for the new VIDIOC_QUERY_EXT_CTRL ioctl. Since uvc doesn't use
the control framework, support for this ioctl isn't automatic.

This is makes v4l2-compliance happy as well.

[Added blank lines for improved readability]

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 927d579e574a..c4b1ac6750d8 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -882,6 +882,35 @@ static int uvc_ioctl_queryctrl(struct file *file, void *fh,
         return uvc_query_v4l2_ctrl(chain, qc);
 }
 
+static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
+                                    struct v4l2_query_ext_ctrl *qec)
+{
+        struct uvc_fh *handle = fh;
+        struct uvc_video_chain *chain = handle->chain;
+        struct v4l2_queryctrl qc = { qec->id };
+        int ret;
+
+        ret = uvc_query_v4l2_ctrl(chain, &qc);
+        if (ret)
+                return ret;
+
+        qec->id = qc.id;
+        qec->type = qc.type;
+        strlcpy(qec->name, qc.name, sizeof(qec->name));
+        qec->minimum = qc.minimum;
+        qec->maximum = qc.maximum;
+        qec->step = qc.step;
+        qec->default_value = qc.default_value;
+        qec->flags = qc.flags;
+        qec->elem_size = 4;
+        qec->elems = 1;
+        qec->nr_of_dims = 0;
+        memset(qec->dims, 0, sizeof(qec->dims));
+        memset(qec->reserved, 0, sizeof(qec->reserved));
+
+        return 0;
+}
+
 static int uvc_ioctl_g_ctrl(struct file *file, void *fh,
                             struct v4l2_control *ctrl)
 {
@@ -1457,6 +1486,7 @@ const struct v4l2_ioctl_ops uvc_ioctl_ops = {
         .vidioc_g_input = uvc_ioctl_g_input,
         .vidioc_s_input = uvc_ioctl_s_input,
         .vidioc_queryctrl = uvc_ioctl_queryctrl,
+        .vidioc_query_ext_ctrl = uvc_ioctl_query_ext_ctrl,
         .vidioc_g_ctrl = uvc_ioctl_g_ctrl,
         .vidioc_s_ctrl = uvc_ioctl_s_ctrl,
         .vidioc_g_ext_ctrls = uvc_ioctl_g_ext_ctrls,