media: atomisp: Replace queryctrl with query_ext_ctrl

The ioctl framework provides an emulator of queryctrl using
query_ext_ctrl.
Replace our implementation of queryctrl to support both.

Now that we are at it:
- Add comment about missing functionality.
- Remove superfluous clear of reserved[0].
- Remove ret var.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Author: ribalda

drivers/staging/media/atomisp/pci/atomisp_ioctl.c

@@ -34,7 +34,7 @@ static const char *CARD = "ATOM ISP";	/* max size 31 */
  * FIXME: ISP should not know beforehand all CIDs supported by sensor.
  * Instead, it needs to propagate to sensor unknown CIDs.
  */
-static struct v4l2_queryctrl ci_v4l2_controls[] = {
+static struct v4l2_query_ext_ctrl ci_v4l2_controls[] = {
 	{
 		.id = V4L2_CID_AUTO_WHITE_BALANCE,
 		.type = V4L2_CTRL_TYPE_BOOLEAN,
@@ -1140,31 +1140,34 @@ static int atomisp_s_ctrl(struct file *file, void *fh,
 
 /*
  * To query the attributes of a control.
- * applications set the id field of a struct v4l2_queryctrl and call the
+ * applications set the id field of a struct v4l2_query_ext_ctrl and call the
  * this ioctl with a pointer to this structure. The driver fills
  * the rest of the structure.
  */
-static int atomisp_queryctl(struct file *file, void *fh,
-			    struct v4l2_queryctrl *qc)
+static int atomisp_query_ext_ctrl(struct file *file, void *fh,
+				  struct v4l2_query_ext_ctrl *qc)
 {
-	int i, ret = -EINVAL;
+	int i;
 
+	/* TODO: implement V4L2_CTRL_FLAG_NEXT_CTRL */
 	if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
-		return ret;
+		return -EINVAL;
 
 	for (i = 0; i < ctrls_num; i++) {
 		if (ci_v4l2_controls[i].id == qc->id) {
-			memcpy(qc, &ci_v4l2_controls[i],
-			       sizeof(struct v4l2_queryctrl));
-			qc->reserved[0] = 0;
-			ret = 0;
-			break;
+			*qc = ci_v4l2_controls[i];
+			qc->elems = 1;
+			qc->elem_size = 4;
+			return 0;
 		}
 	}
-	if (ret != 0)
-		qc->flags = V4L2_CTRL_FLAG_DISABLED;
 
-	return ret;
+	/*
+	 * This is probably not needed, but this flag has been set for
+	 * many kernel versions. Leave it to avoid breaking any apps.
+	 */
+	qc->flags = V4L2_CTRL_FLAG_DISABLED;
+	return -EINVAL;
 }
 
 static int atomisp_camera_g_ext_ctrls(struct file *file, void *fh,
@@ -1561,7 +1564,7 @@ const struct v4l2_ioctl_ops atomisp_ioctl_ops = {
 	.vidioc_enum_input = atomisp_enum_input,
 	.vidioc_g_input = atomisp_g_input,
 	.vidioc_s_input = atomisp_s_input,
-	.vidioc_queryctrl = atomisp_queryctl,
+	.vidioc_query_ext_ctrl = atomisp_query_ext_ctrl,
 	.vidioc_s_ctrl = atomisp_s_ctrl,
 	.vidioc_g_ctrl = atomisp_g_ctrl,
 	.vidioc_s_ext_ctrls = atomisp_s_ext_ctrls,