--- /dev/null
+#if !defined(NO_USB)
+/*
+ Garmin USB layer - OS independent component.
+
+ Copyright (C) 2006 Robert Lipe, robertlipe@usa.net
+
+ 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.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111 USA
+
+ */
+
+/*
+ * The 'low level ops' are registered by the OS layer (win32, libusb, etc.)
+ * to provide gruntwork features for the common USB layer.
+ */
+typedef int (*gusb_llop_get)(garmin_usb_packet *ibuf, size_t sz);
+typedef int (*gusb_llop_send)(const garmin_usb_packet *opkt, size_t sz);
+typedef int (*gusb_llop_close) (gpsdevh *dh);
+
+typedef struct gusb_llops {
+ gusb_llop_get llop_get_intr;
+ gusb_llop_get llop_get_bulk;
+ gusb_llop_send llop_send;
+ gusb_llop_close llop_close;
+} gusb_llops_t;
+
+/* Provided by the common code. */
+void gusb_syncup(void);
+void gusb_register_ll(struct gusb_llops *);
+void gusb_list_units(void);
+
+/* Provided by the OS layers */
+// int gusb_init(const char *portname, gpsdev **dh);
+
+#endif