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diff --git a/src/common.h b/src/common.h
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+++ b/src/common.h
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+/*
+ * Copyright (c) 2012
+ * 	Lars-Dominik Braun <lars@6xq.net>
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef _COMMON_H
+#define _COMMON_H
+
+#include <stdbool.h>
+
+#include "device.h"
+
+typedef enum {
+	HIDPP_RET_OK = 0,
+	HIDPP_RET_ERROR,
+	HIDPP_RET_USB_ERROR,
+} hidppReturn_t;
+
+typedef bool (*hidppAvailableFunction_t) (const hidppDevice_t * const d);
+typedef void (*hidppReadFunction_t) (hidppDevice_t * const d, void ** const data);
+typedef void (*hidppPrintFunction_t) (const void * const data);
+
+typedef struct {
+	hidppAvailableFunction_t available;
+	hidppReadFunction_t read;
+	hidppPrintFunction_t print;
+} hidppModule_t;
+
+void dumphex (const char *prefix, const unsigned char *data, const size_t size);
+
+#endif /* _COMMON_H */
+