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diff --git a/apps/system/i2c/i2ctool.h b/apps/system/i2c/i2ctool.h
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+++ b/apps/system/i2c/i2ctool.h
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+/****************************************************************************
+ * apps/system/i2c/i2ctool.h
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __APPS_SYSTEM_I2C_I2CTOOLS_H
+#define __APPS_SYSTEM_I2C_I2CTOOLS_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* This is the maximum number of arguments that will be accepted for a command */
+
+#define MAX_ARGUMENTS 6
+
+/* Maximum size of one command line */
+
+#define MAX_LINELEN 80
+
+/* Output is via printf but can be changed using this macro */
+
+#ifdef CONFIG_CPP_HAVE_VARARGS
+# define i2c_output(v, fmt...) printf(v, ##fmt)
+#else
+# define i2c_output            printf
+#endif
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+typedef int  (*cmd_t)(FAR void *handle, int argc, char **argv);
+
+struct cmdmap_s
+{
+  const char *cmd;        /* Name of the command */
+  cmd_t       handler;    /* Function that handles the command */
+  uint8_t     minargs;    /* Minimum number of arguments (including command) */
+  uint8_t     maxargs;    /* Maximum number of arguments (including command) */
+  const char *usage;      /* Usage instructions for 'help' command */
+};
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+extern const char g_syntax[];
+extern const char g_fmtargrequired[];
+extern const char g_fmtarginvalid[];
+extern const char g_fmtargrange[];
+extern const char g_fmtcmdnotfound[];
+extern const char g_fmtnosuch[];
+extern const char g_fmttoomanyargs[];
+extern const char g_fmtcmdfailed[];
+extern const char g_fmtcmdoutofmemory[];
+extern const char g_fmtinternalerror[];
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/* Message handler */
+
+ssize_t i2ctool_write(FAR void *handle, FAR const void *buffer, size_t nbytes);
+int i2ctool_printf(FAR void *handle, const char *fmt, ...);
+
+/* Command handlers */
+
+extern int cmd_detect(FAR void *handle, int argc, char **argv);
+extern int cmd_dump(FAR void *handle, int argc, char **argv);
+extern int cmd_get(FAR void *handle, int argc, char **argv);
+extern int cmd_set(FAR void *handle, int argc, char **argv);
+
+#endif /* __APPS_SYSTEM_I2C_I2CTOOLS_H */