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diff --git a/common/tpm_manager_interface.h b/common/tpm_manager_interface.h
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+// Copyright 2015 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef TPM_MANAGER_COMMON_TPM_MANAGER_INTERFACE_H_
+#define TPM_MANAGER_COMMON_TPM_MANAGER_INTERFACE_H_
+
+#include <base/callback.h>
+
+#include "tpm_manager/common/dbus_interface.pb.h"
+#include "tpm_manager/common/export.h"
+
+namespace tpm_manager {
+
+// This is the main TpmManager interface that is implemented by the proxies
+// and services.
+class TPM_MANAGER_EXPORT TpmManagerInterface {
+ public:
+  virtual ~TpmManagerInterface() = default;
+
+  // Performs initialization tasks. This method must be called before calling
+  // any other method on this interface.
+  virtual bool Initialize() = 0;
+
+  // Processes a GetTpmStatusRequest and responds with a GetTpmStatusReply.
+  using GetTpmStatusCallback = base::Callback<void(const GetTpmStatusReply&)>;
+  virtual void GetTpmStatus(const GetTpmStatusRequest& request,
+                            const GetTpmStatusCallback& callback) = 0;
+
+  // Processes a TakeOwnershipRequest and responds with a TakeOwnershipReply.
+  using TakeOwnershipCallback = base::Callback<void(const TakeOwnershipReply&)>;
+  virtual void TakeOwnership(const TakeOwnershipRequest& request,
+                             const TakeOwnershipCallback& callback) = 0;
+};
+
+}  // namespace tpm_manager
+
+#endif  // TPM_MANAGER_COMMON_TPM_MANAGER_INTERFACE_H_