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diff --git a/circuitpython/shared-bindings/adafruit_bus_device/i2c_device/I2CDevice.h b/circuitpython/shared-bindings/adafruit_bus_device/i2c_device/I2CDevice.h
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Mark Komus
+ *
+ * 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.
+ */
+
+// Machine is the HAL for low-level, hardware accelerated functions. It is not
+// meant to simplify APIs, its only meant to unify them so that other modules
+// do not require port specific logic.
+//
+// This file includes externs for all functions a port should implement to
+// support the machine module.
+
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_BUSDEVICE_I2CDEVICE_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_BUSDEVICE_I2CDEVICE_H
+
+#include "py/obj.h"
+
+#include "shared-module/adafruit_bus_device/i2c_device/I2CDevice.h"
+// #include "shared-bindings/busio/I2C.h"
+
+// Type object used in Python. Should be shared between ports.
+extern const mp_obj_type_t adafruit_bus_device_i2cdevice_type;
+
+// Initializes the hardware peripheral.
+extern void common_hal_adafruit_bus_device_i2cdevice_construct(adafruit_bus_device_i2cdevice_obj_t *self, mp_obj_t *i2c, uint8_t device_address);
+extern void common_hal_adafruit_bus_device_i2cdevice_lock(adafruit_bus_device_i2cdevice_obj_t *self);
+extern void common_hal_adafruit_bus_device_i2cdevice_unlock(adafruit_bus_device_i2cdevice_obj_t *self);
+extern void common_hal_adafruit_bus_device_i2cdevice_probe_for_device(adafruit_bus_device_i2cdevice_obj_t *self);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_BUSDEVICE_I2CDEVICE_H