[media] V4L: Add support for integer menu controls with standard menu items

The patch modifies the helper function v4l2_ctrl_new_std_menu
to accept integer menu controls with standard menu items.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Arun Kumar K <arun.kk@samsung.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Documentation/video4linux/v4l2-controls.txt

@@ -124,19 +124,13 @@ You add non-menu controls by calling v4l2_ctrl_new_std:
 			const struct v4l2_ctrl_ops *ops,
 			u32 id, s32 min, s32 max, u32 step, s32 def);
 
-Menu controls are added by calling v4l2_ctrl_new_std_menu:
+Menu and integer menu controls are added by calling v4l2_ctrl_new_std_menu:
 
 	struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
 			const struct v4l2_ctrl_ops *ops,
 			u32 id, s32 max, s32 skip_mask, s32 def);
 
-Or alternatively for integer menu controls, by calling v4l2_ctrl_new_int_menu:
-
-	struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
-			const struct v4l2_ctrl_ops *ops,
-			u32 id, s32 max, s32 def, const s64 *qmenu_int);
-
-Standard menu controls with a driver specific menu are added by calling
+Menu controls with a driver specific menu are added by calling
 v4l2_ctrl_new_std_menu_items:
 
        struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(
@@ -144,6 +138,13 @@ v4l2_ctrl_new_std_menu_items:
                        const struct v4l2_ctrl_ops *ops, u32 id, s32 max,
                        s32 skip_mask, s32 def, const char * const *qmenu);
 
+Integer menu controls with a driver specific menu can be added by calling
+v4l2_ctrl_new_int_menu:
+
+	struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
+			const struct v4l2_ctrl_ops *ops,
+			u32 id, s32 max, s32 def, const s64 *qmenu_int);
+
 These functions are typically called right after the v4l2_ctrl_handler_init:
 
 	static const s64 exp_bias_qmenu[] = {

drivers/media/v4l2-core/v4l2-ctrls.c

@@ -552,6 +552,20 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
 }
 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
 
+/*
+ * Returns NULL or an s64 type array containing the menu for given
+ * control ID. The total number of the menu items is returned in @len.
+ */
+const s64 const *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
+{
+	switch (id) {
+	default:
+		*len = 0;
+		return NULL;
+	};
+}
+EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
+
 /* Return the control name. */
 const char *v4l2_ctrl_get_name(u32 id)
 {
@@ -1712,20 +1726,28 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
 			const struct v4l2_ctrl_ops *ops,
 			u32 id, s32 max, s32 mask, s32 def)
 {
-	const char * const *qmenu = v4l2_ctrl_get_menu(id);
+	const char * const *qmenu = NULL;
+	const s64 *qmenu_int = NULL;
 	const char *name;
 	enum v4l2_ctrl_type type;
+	unsigned int qmenu_int_len;
 	s32 min;
 	s32 step;
 	u32 flags;
 
 	v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
-	if (type != V4L2_CTRL_TYPE_MENU) {
+
+	if (type == V4L2_CTRL_TYPE_MENU)
+		qmenu = v4l2_ctrl_get_menu(id);
+	else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
+		qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
+
+	if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
 		handler_set_err(hdl, -EINVAL);
 		return NULL;
 	}
 	return v4l2_ctrl_new(hdl, ops, id, name, type,
-			     0, max, mask, def, flags, qmenu, NULL, NULL);
+			     0, max, mask, def, flags, qmenu, qmenu_int, NULL);
 }
 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);