v4.19.13 snapshot.
diff --git a/drivers/input/mouse/touchkit_ps2.h b/drivers/input/mouse/touchkit_ps2.h
new file mode 100644
index 0000000..2efe9ea
--- /dev/null
+++ b/drivers/input/mouse/touchkit_ps2.h
@@ -0,0 +1,25 @@
+/* ----------------------------------------------------------------------------
+ * touchkit_ps2.h -- Driver for eGalax TouchKit PS/2 Touchscreens
+ *
+ * Copyright (C) 2005 by Stefan Lucke
+ * Copyright (c) 2005 Vojtech Pavlik
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#ifndef _TOUCHKIT_PS2_H
+#define _TOUCHKIT_PS2_H
+
+#ifdef CONFIG_MOUSE_PS2_TOUCHKIT
+int touchkit_ps2_detect(struct psmouse *psmouse, bool set_properties);
+#else
+static inline int touchkit_ps2_detect(struct psmouse *psmouse,
+ bool set_properties)
+{
+ return -ENOSYS;
+}
+#endif /* CONFIG_MOUSE_PS2_TOUCHKIT */
+
+#endif