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diff --git a/backend/genesys/scanner_interface.h b/backend/genesys/scanner_interface.h
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+/* sane - Scanner Access Now Easy.
+
+   Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
+
+   This file is part of the SANE package.
+
+   This program 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 2 of the
+   License, or (at your option) any later version.
+
+   This program 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 this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+
+   As a special exception, the authors of SANE give permission for
+   additional uses of the libraries contained in this release of SANE.
+
+   The exception is that, if you link a SANE library with other files
+   to produce an executable, this does not by itself cause the
+   resulting executable to be covered by the GNU General Public
+   License.  Your use of that executable is in no way restricted on
+   account of linking the SANE library code into it.
+
+   This exception does not, however, invalidate any other reasons why
+   the executable file might be covered by the GNU General Public
+   License.
+
+   If you submit changes to SANE to the maintainers to be included in
+   a subsequent release, you agree by submitting the changes that
+   those changes may be distributed with this exception intact.
+
+   If you write modifications of your own for SANE, it is your choice
+   whether to permit this exception to apply to your modifications.
+   If you do not wish that, delete this exception notice.
+*/
+
+#ifndef BACKEND_GENESYS_SCANNER_INTERFACE_H
+#define BACKEND_GENESYS_SCANNER_INTERFACE_H
+
+#include "fwd.h"
+#include <cstddef>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+namespace genesys {
+
+// Represents an interface through which all low level operations are performed.
+class ScannerInterface
+{
+public:
+    enum Flags {
+        FLAG_NONE = 0,
+        FLAG_SWAP_REGISTERS = 1 << 0,
+        FLAG_SMALL_ADDRESS = 1 << 1
+    };
+
+    virtual ~ScannerInterface();
+
+    virtual bool is_mock() const = 0;
+
+    virtual std::uint8_t read_register(std::uint16_t address) = 0;
+    virtual void write_register(std::uint16_t address, std::uint8_t value) = 0;
+    virtual void write_registers(const Genesys_Register_Set& regs) = 0;
+
+    virtual void write_0x8c(std::uint8_t index, std::uint8_t value) = 0;
+    virtual void bulk_read_data(std::uint8_t addr, std::uint8_t* data, std::size_t size) = 0;
+    virtual void bulk_write_data(std::uint8_t addr, std::uint8_t* data, std::size_t size) = 0;
+
+    // GL646, GL841, GL843 have different ways to write to RAM and to gamma tables
+    // FIXME: remove flags when updating tests
+    virtual void write_buffer(std::uint8_t type, std::uint32_t addr, std::uint8_t* data,
+                              std::size_t size, Flags flags = FLAG_NONE) = 0;
+
+    virtual void write_gamma(std::uint8_t type, std::uint32_t addr, std::uint8_t* data,
+                             std::size_t size, Flags flags = FLAG_NONE) = 0;
+
+    // GL845, GL846, GL847 and GL124 have a uniform way to write to RAM tables
+    virtual void write_ahb(std::uint32_t addr, std::uint32_t size, std::uint8_t* data) = 0;
+
+    virtual std::uint16_t read_fe_register(std::uint8_t address) = 0;
+    virtual void write_fe_register(std::uint8_t address, std::uint16_t value) = 0;
+
+    virtual IUsbDevice& get_usb_device() = 0;
+
+    // sleeps the specified number of microseconds. Will not sleep if testing mode is enabled.
+    virtual void sleep_us(unsigned microseconds) = 0;
+
+    void sleep_ms(unsigned milliseconds)
+    {
+        sleep_us(milliseconds * 1000);
+    }
+
+    virtual void record_progress_message(const char* msg) = 0;
+
+    virtual void record_slope_table(unsigned table_nr, const std::vector<std::uint16_t>& steps) = 0;
+
+    virtual void record_key_value(const std::string& key, const std::string& value) = 0;
+
+    virtual void test_checkpoint(const std::string& name) = 0;
+};
+
+} // namespace genesys
+
+#endif