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diff --git a/host/include/uhd/utils/gain_group.hpp b/host/include/uhd/utils/gain_group.hpp
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+++ b/host/include/uhd/utils/gain_group.hpp
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+//
+// Copyright 2010 Ettus Research LLC
+//
+// 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 3 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, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_UHD_UTILS_GAIN_GROUP_HPP
+#define INCLUDED_UHD_UTILS_GAIN_GROUP_HPP
+
+#include <uhd/config.hpp>
+#include <uhd/types/ranges.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/function.hpp>
+#include <boost/utility.hpp>
+
+namespace uhd{
+
+/*!
+ * A set of function to control a gain element.
+ */
+struct UHD_API gain_fcns_t{
+    boost::function<gain_range_t(void)> get_range;
+    boost::function<float(void)>        get_value;
+    boost::function<void(float)>        set_value;
+};
+
+class UHD_API gain_group : boost::noncopyable{
+public:
+    typedef boost::shared_ptr<gain_group> sptr;
+
+    /*!
+     * Get the overall gain range for this group.
+     * Overall step is defined as the minimum step size.
+     * \return a gain range with overall min, max, step
+     */
+    virtual gain_range_t get_range(void) = 0;
+
+    /*!
+     * Get the overall gain value for this group.
+     * \return a summation of all the gain values
+     */
+    virtual float get_value(void) = 0;
+
+    /*!
+     * Set the overall gain value for this group.
+     * The power will be distributed across individual gain elements.
+     * The semantics of how to do this are determined by the priority.
+     * \param gain the gain to set across the group
+     */
+    virtual void set_value(float gain) = 0;
+
+    /*!
+     * Register a set of gain functions into this group.
+     * Priority determines how power will be distributed
+     * with higher priorities getting the power first,
+     * and lower priorities getting the remainder power.
+     * \param gain_fcns the set of gain functions
+     * \param priority the priority of the gain element
+     */
+    virtual void register_fcns(
+        const gain_fcns_t &gain_fcns, size_t priority = 0
+    ) = 0;
+
+    /*!
+     * Make a new empty gain group.
+     * \return a gain group object.
+     */
+    static sptr make(void);
+};
+
+} //namespace uhd
+
+#endif /* INCLUDED_UHD_UTILS_GAIN_GROUP_HPP */
+