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diff --git a/circuitpython/shared-bindings/microcontroller/Pin.h b/circuitpython/shared-bindings/microcontroller/Pin.h
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft
+ *
+ * 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 MICROPY_INCLUDED_SHARED_BINDINGS_MICROCONTROLLER_PIN_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_MICROCONTROLLER_PIN_H
+
+#include "common-hal/microcontroller/Pin.h"
+#include "py/obj.h"
+
+// Type object used in Python. Should be shared between ports.
+extern const mp_obj_type_t mcu_pin_type;
+
+const mcu_pin_obj_t *validate_obj_is_pin(mp_obj_t obj);
+const mcu_pin_obj_t *validate_obj_is_pin_or_none(mp_obj_t obj);
+const mcu_pin_obj_t *validate_obj_is_free_pin(mp_obj_t obj);
+const mcu_pin_obj_t *validate_obj_is_free_pin_or_none(mp_obj_t obj);
+void validate_no_duplicate_pins(mp_obj_t seq, qstr arg_name);
+void validate_no_duplicate_pins_2(mp_obj_t seq1, mp_obj_t seq2, qstr arg_name1, qstr arg_name2);
+void validate_list_is_free_pins(qstr what, const mcu_pin_obj_t **pins_out, mp_int_t max_pins, mp_obj_t seq, uint8_t *count_out);
+void validate_pins(qstr what, uint8_t *pin_nos, mp_int_t max_pins, mp_obj_t seq, uint8_t *count_out);
+
+void assert_pin_free(const mcu_pin_obj_t *pin);
+
+bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t *pin);
+void common_hal_never_reset_pin(const mcu_pin_obj_t *pin);
+void common_hal_reset_pin(const mcu_pin_obj_t *pin);
+uint8_t common_hal_mcu_pin_number(const mcu_pin_obj_t *pin);
+void common_hal_mcu_pin_claim(const mcu_pin_obj_t *pin);
+void common_hal_mcu_pin_claim_number(uint8_t pin_no);
+void common_hal_mcu_pin_reset_number(uint8_t pin_no);
+
+#define COMMON_HAL_MCU_NO_PIN ((uint8_t)0xff)
+
+#endif  // MICROPY_INCLUDED_SHARED_BINDINGS_MICROCONTROLLER_PIN_H