atrf-gpio: new utility to directly access GPIOs (for now atben-only)

- tools/atrf-gpio/: new utility to directly access GPIOs
- tools/Makefile (BEN_DIRS): added atrf-gpio

tools/atrf-gpio/atusb.c

@@ -0,0 +1,27 @@
+/*
+ * atrf-gpio/atusb.c - ATUSB-specific GPIO driver
+ *
+ * Written 2011 by Werner Almesberger
+ * Copyright 2011 Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+#include <stdlib.h>
+
+#include "atrf.h"
+
+#include "atrf-gpio.h"
+
+
+/* ----- Decode and apply pattern ------------------------------------------ */
+
+
+void do_atusb(struct atrf_dsc *dsc, const char *pattern, const char *next)
+{
+	abort();
+}