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diff --git a/circuitpython/shared-bindings/digitalio/DigitalInOut.h b/circuitpython/shared-bindings/digitalio/DigitalInOut.h
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+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2013, 2014 Damien P. George
+ *
+ * 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_DIGITALIO_DIGITALINOUT_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_DIGITALINOUT_H
+
+#include "common-hal/microcontroller/Pin.h"
+#include "common-hal/digitalio/DigitalInOut.h"
+#include "shared-bindings/digitalio/Direction.h"
+#include "shared-bindings/digitalio/DriveMode.h"
+#include "shared-bindings/digitalio/Pull.h"
+
+extern const mp_obj_type_t digitalio_digitalinout_type;
+
+typedef enum {
+    DIGITALINOUT_OK,
+    DIGITALINOUT_PIN_BUSY,
+    DIGITALINOUT_INPUT_ONLY
+} digitalinout_result_t;
+
+typedef enum {
+    DIGITALINOUT_REG_READ,
+    DIGITALINOUT_REG_WRITE,
+    DIGITALINOUT_REG_SET,
+    DIGITALINOUT_REG_RESET,
+    DIGITALINOUT_REG_TOGGLE,
+} digitalinout_reg_op_t;
+
+digitalinout_result_t common_hal_digitalio_digitalinout_construct(digitalio_digitalinout_obj_t *self, const mcu_pin_obj_t *pin);
+void common_hal_digitalio_digitalinout_deinit(digitalio_digitalinout_obj_t *self);
+bool common_hal_digitalio_digitalinout_deinited(digitalio_digitalinout_obj_t *self);
+void common_hal_digitalio_digitalinout_switch_to_input(digitalio_digitalinout_obj_t *self, digitalio_pull_t pull);
+digitalinout_result_t common_hal_digitalio_digitalinout_switch_to_output(digitalio_digitalinout_obj_t *self, bool value, digitalio_drive_mode_t drive_mode);
+digitalio_direction_t common_hal_digitalio_digitalinout_get_direction(digitalio_digitalinout_obj_t *self);
+void common_hal_digitalio_digitalinout_set_value(digitalio_digitalinout_obj_t *self, bool value);
+bool common_hal_digitalio_digitalinout_get_value(digitalio_digitalinout_obj_t *self);
+digitalinout_result_t common_hal_digitalio_digitalinout_set_drive_mode(digitalio_digitalinout_obj_t *self, digitalio_drive_mode_t drive_mode);
+digitalio_drive_mode_t common_hal_digitalio_digitalinout_get_drive_mode(digitalio_digitalinout_obj_t *self);
+void common_hal_digitalio_digitalinout_set_pull(digitalio_digitalinout_obj_t *self, digitalio_pull_t pull);
+digitalio_pull_t common_hal_digitalio_digitalinout_get_pull(digitalio_digitalinout_obj_t *self);
+void common_hal_digitalio_digitalinout_never_reset(digitalio_digitalinout_obj_t *self);
+digitalio_digitalinout_obj_t *assert_digitalinout(mp_obj_t obj);
+
+volatile uint32_t *common_hal_digitalio_digitalinout_get_reg(digitalio_digitalinout_obj_t *self, digitalinout_reg_op_t op, uint32_t *mask);
+bool common_hal_digitalio_has_reg_op(digitalinout_reg_op_t op);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_DIGITALINOUT_H