Input: psmouse - allow disabing certain protocol extensions

Allow ALPS, LOGIPS2PP, LIFEBOOK, TRACKPOINT and TOUCHKIT protocol
extensions of psmouse to be disabled during compilation. This will
allow users save some memory when they are sure that they will only
use a certain type of mice.

Signed-off-by: Andres Salomon <dilinger@debian.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/mouse/logips2pp.h b/drivers/input/mouse/logips2pp.h
index 64a8ec5..6e57125 100644
--- a/drivers/input/mouse/logips2pp.h
+++ b/drivers/input/mouse/logips2pp.h
@@ -11,6 +11,13 @@
 #ifndef _LOGIPS2PP_H
 #define _LOGIPS2PP_H
 
+#ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
 int ps2pp_init(struct psmouse *psmouse, int set_properties);
+#else
+inline int ps2pp_init(struct psmouse *psmouse, int set_properties)
+{
+	return -ENOSYS;
+}
+#endif /* CONFIG_MOUSE_PS2_LOGIPS2PP */
 
 #endif