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diff --git a/circuitpython/shared-bindings/sdioio/SDCard.h b/circuitpython/shared-bindings/sdioio/SDCard.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_BUSIO_SDIO_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_BUSIO_SDIO_H
+
+#include "py/obj.h"
+
+#include "common-hal/microcontroller/Pin.h"
+#include "common-hal/sdioio/SDCard.h"
+
+// Type object used in Python. Should be shared between ports.
+extern const mp_obj_type_t sdioio_SDCard_type;
+
+// Construct an underlying SDIO object.
+extern void common_hal_sdioio_sdcard_construct(sdioio_sdcard_obj_t *self,
+    const mcu_pin_obj_t *clock, const mcu_pin_obj_t *command,
+    uint8_t num_data, const mcu_pin_obj_t **data, uint32_t frequency);
+
+extern void common_hal_sdioio_sdcard_deinit(sdioio_sdcard_obj_t *self);
+extern bool common_hal_sdioio_sdcard_deinited(sdioio_sdcard_obj_t *self);
+
+extern bool common_hal_sdioio_sdcard_configure(sdioio_sdcard_obj_t *self, uint32_t baudrate, uint8_t width);
+
+extern void common_hal_sdioio_sdcard_unlock(sdioio_sdcard_obj_t *self);
+
+// Return actual SDIO bus frequency.
+uint32_t common_hal_sdioio_sdcard_get_frequency(sdioio_sdcard_obj_t *self);
+
+// Return SDIO bus width.
+uint8_t common_hal_sdioio_sdcard_get_width(sdioio_sdcard_obj_t *self);
+
+// Return number of device blocks
+uint32_t common_hal_sdioio_sdcard_get_count(sdioio_sdcard_obj_t *self);
+
+// Read or write blocks
+int common_hal_sdioio_sdcard_readblocks(sdioio_sdcard_obj_t *self, uint32_t start_block, mp_buffer_info_t *bufinfo);
+int common_hal_sdioio_sdcard_writeblocks(sdioio_sdcard_obj_t *self, uint32_t start_block, mp_buffer_info_t *bufinfo);
+
+// This is used by the supervisor to claim SDIO devices indefinitely.
+extern void common_hal_sdioio_sdcard_never_reset(sdioio_sdcard_obj_t *self);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_BUSIO_SDIO_H