Initial driver registration mechanism

Also added the basis of the upekts driver, which is the first I'll
implement.

libfprint/fp_internal.h

@@ -0,0 +1,42 @@
+/*
+ * Internal/private definitions for libfprint
+ * Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __FPRINT_INTERNAL_H__
+#define __FPRINT_INTERNAL_H__
+
+#include <stdint.h>
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof(*a))
+
+struct usb_id {
+	uint16_t vendor;
+	uint16_t product;
+	unsigned long driver_data;
+};
+
+struct fp_driver {
+	const char *name;
+	const char *full_name;
+	const struct usb_id * const id_table;
+};
+
+extern const struct fp_driver upekts_driver;
+
+#endif
+