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diff --git a/libmaple/include/libmaple/i2c_common.h b/libmaple/include/libmaple/i2c_common.h
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+++ b/libmaple/include/libmaple/i2c_common.h
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung (from <libmaple/i2c.h>).
+ * Copyright (c) 2012 LeafLabs, LLC.
+ *
+ * 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.
+ *****************************************************************************/
+
+/**
+ * @file libmaple/include/libmaple/i2c_common.h
+ * @author Marti Bolivar <mbolivar@leaflabs.com>
+ * @brief This file is an implementation detail
+ *
+ * CONTENTS UNSTABLE. The existence of this file is an implementation
+ * detail.  Never include it directly.  If you need something from
+ * here, include <libmaple/i2c.h> instead.
+ */
+
+#ifndef _LIBMAPLE_I2C_COMMON_H_
+#define _LIBMAPLE_I2C_COMMON_H_
+
+#include <libmaple/libmaple_types.h>
+#include <libmaple/nvic.h>
+#include <libmaple/rcc.h>
+
+struct gpio_dev;
+struct i2c_reg_map;
+struct i2c_msg;
+
+/** I2C device states */
+typedef enum i2c_state {
+    I2C_STATE_DISABLED          = 0, /**< Disabled */
+    I2C_STATE_IDLE              = 1, /**< Idle */
+    I2C_STATE_XFER_DONE         = 2, /**< Done with transfer */
+    I2C_STATE_BUSY              = 3, /**< Busy */
+    I2C_STATE_ERROR             = -1 /**< Error occurred */
+} i2c_state;
+
+/**
+ * @brief I2C device type.
+ */
+typedef struct i2c_dev {
+    struct i2c_reg_map *regs;   /**< Register map */
+    struct i2c_msg *msg;        /**< Messages */
+    uint32 error_flags;         /**< Error flags, set on I2C error condition */
+    volatile uint32 timestamp;  /**< For internal use */
+
+    /**
+     * @brief Deprecated. Use .scl_port or .sda_port instead.
+     * If non-null, this will be used as SDA, SCL pins' GPIO port. If
+     * null, then .sda_port will be used for SDA, and .sda_port for
+     * SDA. */
+    struct gpio_dev *gpio_port;
+
+    /**
+     * @brief SDA GPIO device (but see .gpio_port).
+     */
+    struct gpio_dev *sda_port;
+
+    /**
+     * @brief SCL GPIO device (but see .gpio_port).
+     */
+    struct gpio_dev *scl_port;
+
+    uint16 msgs_left;           /**< Messages left */
+    uint8 sda_pin;              /**< SDA bit on gpio_port */
+    uint8 scl_pin;              /**< SCL bit on gpio_port */
+    rcc_clk_id clk_id;          /**< RCC clock information */
+    nvic_irq_num ev_nvic_line;  /**< Event IRQ number */
+    nvic_irq_num er_nvic_line;  /**< Error IRQ number */
+    volatile i2c_state state;   /**< Device state */
+} i2c_dev;
+
+#endif