media: uvcvideo: Factor out query_boundaries from query_ctrl

Split the function in two parts. queryctrl_boundaries will be used in
future patches.

No functional change expected from this patch.

Reviewed-by: Yunke Cao <yunkec@google.com>
Tested-by: Yunke Cao <yunkec@google.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Link: https://lore.kernel.org/r/20250203-uvc-roi-v17-11-5900a9fed613@chromium.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

Author: ribalda

drivers/media/usb/uvc/uvc_ctrl.c

@@ -1374,53 +1374,11 @@ static u32 uvc_get_ctrl_bitmap(struct uvc_control *ctrl,
 	return ~0;
 }
 
-static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
-	struct uvc_control *ctrl,
-	struct uvc_control_mapping *mapping,
-	struct v4l2_queryctrl *v4l2_ctrl)
+static int __uvc_queryctrl_boundaries(struct uvc_video_chain *chain,
+				      struct uvc_control *ctrl,
+				      struct uvc_control_mapping *mapping,
+				      struct v4l2_queryctrl *v4l2_ctrl)
 {
-	struct uvc_control_mapping *master_map = NULL;
-	struct uvc_control *master_ctrl = NULL;
-
-	memset(v4l2_ctrl, 0, sizeof(*v4l2_ctrl));
-	v4l2_ctrl->id = mapping->id;
-	v4l2_ctrl->type = mapping->v4l2_type;
-	strscpy(v4l2_ctrl->name, uvc_map_get_name(mapping),
-		sizeof(v4l2_ctrl->name));
-	v4l2_ctrl->flags = 0;
-
-	if (!(ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR))
-		v4l2_ctrl->flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
-	if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
-		v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
-
-	if (mapping->master_id)
-		__uvc_find_control(ctrl->entity, mapping->master_id,
-				   &master_map, &master_ctrl, 0, 0);
-	if (master_ctrl && (master_ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR)) {
-		s32 val;
-		int ret;
-
-		if (WARN_ON(uvc_ctrl_mapping_is_compound(master_map)))
-			return -EIO;
-
-		ret = __uvc_ctrl_get(chain, master_ctrl, master_map, &val);
-		if (ret < 0)
-			return ret;
-
-		if (val != mapping->master_manual)
-				v4l2_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
-	}
-
-	if (v4l2_ctrl->type >= V4L2_CTRL_COMPOUND_TYPES) {
-		v4l2_ctrl->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
-		v4l2_ctrl->default_value = 0;
-		v4l2_ctrl->minimum = 0;
-		v4l2_ctrl->maximum = 0;
-		v4l2_ctrl->step = 0;
-		return 0;
-	}
-
 	if (!ctrl->cached) {
 		int ret = uvc_ctrl_populate_cache(chain, ctrl);
 		if (ret < 0)
@@ -1464,18 +1422,74 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN)
 		v4l2_ctrl->minimum = uvc_mapping_get_s32(mapping, UVC_GET_MIN,
 				uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
+	else
+		v4l2_ctrl->minimum = 0;
 
 	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MAX)
 		v4l2_ctrl->maximum = uvc_mapping_get_s32(mapping, UVC_GET_MAX,
 				uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
+	else
+		v4l2_ctrl->maximum = 0;
 
 	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES)
 		v4l2_ctrl->step = uvc_mapping_get_s32(mapping, UVC_GET_RES,
 				uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
+	else
+		v4l2_ctrl->step = 0;
 
 	return 0;
 }
 
+static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
+				 struct uvc_control *ctrl,
+				 struct uvc_control_mapping *mapping,
+				 struct v4l2_queryctrl *v4l2_ctrl)
+{
+	struct uvc_control_mapping *master_map = NULL;
+	struct uvc_control *master_ctrl = NULL;
+
+	memset(v4l2_ctrl, 0, sizeof(*v4l2_ctrl));
+	v4l2_ctrl->id = mapping->id;
+	v4l2_ctrl->type = mapping->v4l2_type;
+	strscpy(v4l2_ctrl->name, uvc_map_get_name(mapping),
+		sizeof(v4l2_ctrl->name));
+	v4l2_ctrl->flags = 0;
+
+	if (!(ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR))
+		v4l2_ctrl->flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
+	if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
+		v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	if (mapping->master_id)
+		__uvc_find_control(ctrl->entity, mapping->master_id,
+				   &master_map, &master_ctrl, 0, 0);
+	if (master_ctrl && (master_ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR)) {
+		s32 val;
+		int ret;
+
+		if (WARN_ON(uvc_ctrl_mapping_is_compound(master_map)))
+			return -EIO;
+
+		ret = __uvc_ctrl_get(chain, master_ctrl, master_map, &val);
+		if (ret < 0)
+			return ret;
+
+		if (val != mapping->master_manual)
+			v4l2_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
+	}
+
+	if (v4l2_ctrl->type >= V4L2_CTRL_COMPOUND_TYPES) {
+		v4l2_ctrl->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
+		v4l2_ctrl->default_value = 0;
+		v4l2_ctrl->minimum = 0;
+		v4l2_ctrl->maximum = 0;
+		v4l2_ctrl->step = 0;
+		return 0;
+	}
+
+	return __uvc_queryctrl_boundaries(chain, ctrl, mapping, v4l2_ctrl);
+}
+
 int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 	struct v4l2_queryctrl *v4l2_ctrl)
 {