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diff --git a/quantum/midi/midi_device.h b/quantum/midi/midi_device.h
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+// midi for embedded chips,
+// Copyright 2010 Alex Norman
+//
+// This file is part of avr-midi.
+//
+// avr-midi is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+// avr-midi is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with avr-midi.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * @file
+ * @brief Device implementation functions
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @defgroup midi_device Functions used when implementing your own midi device.
+ *
+ * You use the functions when you are implementing your own midi device.
+ *
+ * You set a send function to actually send bytes via your device, this method
+ * is called when you call a send function with this device, for instance
+ * midi_send_cc
+ *
+ * You use the midi_device_input to process input data from the device and pass
+ * it through the device's associated callbacks.
+ *
+ * You use the midi_device_set_pre_input_process_func if you want to have a
+ * function called at the beginning of the device's process function, generally
+ * to poll for input and pass that into midi_device_input
+ *
+ * @{
+ */
+
+#include "midi_function_types.h"
+#include "bytequeue/bytequeue.h"
+#define MIDI_INPUT_QUEUE_LENGTH 192
+
+typedef enum { IDLE, ONE_BYTE_MESSAGE = 1, TWO_BYTE_MESSAGE = 2, THREE_BYTE_MESSAGE = 3, SYSEX_MESSAGE } input_state_t;
+
+typedef void (*midi_no_byte_func_t)(MidiDevice* device);
+
+/**
+ * \struct _midi_device
+ *
+ * @brief This structure represents the input and output functions and
+ * processing data for a midi device.
+ *
+ * A device can represent an actual physical device [serial port, usb port] or
+ * something virtual.
+ * You should not need to modify this structure directly.
+ */
+struct _midi_device {
+    // output send function
+    midi_var_byte_func_t send_func;
+
+    //********input callbacks
+    // three byte funcs
+    midi_three_byte_func_t input_cc_callback;
+    midi_three_byte_func_t input_noteon_callback;
+    midi_three_byte_func_t input_noteoff_callback;
+    midi_three_byte_func_t input_aftertouch_callback;
+    midi_three_byte_func_t input_pitchbend_callback;
+    midi_three_byte_func_t input_songposition_callback;
+    // two byte funcs
+    midi_two_byte_func_t input_progchange_callback;
+    midi_two_byte_func_t input_chanpressure_callback;
+    midi_two_byte_func_t input_songselect_callback;
+    midi_two_byte_func_t input_tc_quarterframe_callback;
+    // one byte funcs
+    midi_one_byte_func_t input_realtime_callback;
+    midi_one_byte_func_t input_tunerequest_callback;
+
+    // sysex
+    midi_sysex_func_t input_sysex_callback;
+
+    // only called if more specific callback is not matched
+    midi_var_byte_func_t input_fallthrough_callback;
+    // called if registered, independent of other callbacks
+    midi_var_byte_func_t input_catchall_callback;
+
+    // pre input processing function
+    midi_no_byte_func_t pre_input_process_callback;
+
+    // for internal input processing
+    uint8_t       input_buffer[3];
+    input_state_t input_state;
+    uint16_t      input_count;
+
+    // for queueing data between the input and the processing functions
+    uint8_t     input_queue_data[MIDI_INPUT_QUEUE_LENGTH];
+    byteQueue_t input_queue;
+};
+
+/**
+ * @brief Process input bytes.  This function parses bytes and calls the
+ * appropriate callbacks associated with the given device.  You use this
+ * function if you are creating a custom device and you want to have midi
+ * input.
+ *
+ * @param device the midi device to associate the input with
+ * @param cnt the number of bytes you are processing
+ * @param input the bytes to process
+ */
+void midi_device_input(MidiDevice* device, uint8_t cnt, uint8_t* input);
+
+/**
+ * @brief Set the callback function that will be used for sending output
+ * data bytes.  This is only used if you're creating a custom device.
+ * You'll most likely want the callback function to disable interrupts so
+ * that you can call the various midi send functions without worrying about
+ * locking.
+ *
+ * \param device the midi device to associate this callback with
+ * \param send_func the callback function that will do the sending
+ */
+void midi_device_set_send_func(MidiDevice* device, midi_var_byte_func_t send_func);
+
+/**
+ * @brief Set a callback which is called at the beginning of the
+ * midi_device_process call.  This can be used to poll for input
+ * data and send the data through the midi_device_input function.
+ * You'll probably only use this if you're creating a custom device.
+ *
+ * \param device the midi device to associate this callback with
+ * \param midi_no_byte_func_t the actual callback function
+ */
+void midi_device_set_pre_input_process_func(MidiDevice* device, midi_no_byte_func_t pre_process_func);
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif