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diff --git a/backend/genesys/register_cache.h b/backend/genesys/register_cache.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_REGISTER_CACHE_H
+#define BACKEND_GENESYS_REGISTER_CACHE_H
+
+#include "register.h"
+
+namespace genesys {
+
+template<class Value>
+class RegisterCache
+{
+public:
+    void update(std::uint16_t address, Value value)
+    {
+        if (regs_.has_reg(address)) {
+            regs_.set(address, value);
+        } else {
+            regs_.init_reg(address, value);
+        }
+    }
+
+    void update(const Genesys_Register_Set& regs)
+    {
+        for (const auto& reg : regs) {
+            update(reg.address, reg.value);
+        }
+    }
+
+    Value get(std::uint16_t address) const
+    {
+        return regs_.get(address);
+    }
+
+private:
+    RegisterContainer<Value> regs_;
+
+    template<class V>
+    friend std::ostream& operator<<(std::ostream& out, const RegisterCache<V>& cache);
+};
+
+template<class Value>
+std::ostream& operator<<(std::ostream& out, const RegisterCache<Value>& cache)
+{
+    out << cache.regs_;
+    return out;
+}
+
+} // namespace genesys
+
+#endif // BACKEND_GENESYS_LINE_BUFFER_H