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diff --git a/include/iprt/power.h b/include/iprt/power.h
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+/** @file
+ * IPRT - Power management.
+ */
+
+/*
+ * Copyright (C) 2008-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * 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, in version 3 of the
+ * License.
+ *
+ * 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 <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef IPRT_INCLUDED_power_h
+#define IPRT_INCLUDED_power_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/cdefs.h>
+#include <iprt/types.h>
+
+
+RT_C_DECLS_BEGIN
+
+/** @defgroup grp_rt_power RTPower - Power management
+ * @ingroup grp_rt
+ * @{
+ */
+
+#ifdef IN_RING0
+
+/**
+ * MP event, see FNRTPOWERNOTIFICATION.
+ */
+typedef enum RTPOWEREVENT
+{
+    /** The system will go into suspend mode. */
+    RTPOWEREVENT_SUSPEND = 1,
+    /** The system has resumed. */
+    RTPOWEREVENT_RESUME
+} RTPOWEREVENT;
+
+/**
+ * Notification callback.
+ *
+ * The context this is called in differs a bit from platform to
+ * platform, so be careful while in here.
+ *
+ * @param   enmEvent    The event.
+ * @param   pvUser      The user argument.
+ */
+typedef DECLCALLBACKTYPE(void, FNRTPOWERNOTIFICATION,(RTPOWEREVENT enmEvent, void *pvUser));
+/** Pointer to a FNRTPOWERNOTIFICATION(). */
+typedef FNRTPOWERNOTIFICATION *PFNRTPOWERNOTIFICATION;
+
+/**
+ * Registers a notification callback for power events.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_NO_MEMORY if a registration record cannot be allocated.
+ * @retval  VERR_ALREADY_EXISTS if the pfnCallback and pvUser already exist
+ *          in the callback list.
+ *
+ * @param   pfnCallback     The callback.
+ * @param   pvUser          The user argument to the callback function.
+ */
+RTDECL(int) RTPowerNotificationRegister(PFNRTPOWERNOTIFICATION pfnCallback, void *pvUser);
+
+/**
+ * This deregisters a notification callback registered via RTPowerNotificationRegister().
+ *
+ * The pfnCallback and pvUser arguments must be identical to the registration call
+ * of we won't find the right entry.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_NOT_FOUND if no matching entry was found.
+ *
+ * @param   pfnCallback     The callback.
+ * @param   pvUser          The user argument to the callback function.
+ */
+RTDECL(int) RTPowerNotificationDeregister(PFNRTPOWERNOTIFICATION pfnCallback, void *pvUser);
+
+/**
+ * This calls all registered power management callback handlers registered via RTPowerNotificationRegister().
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_SUCCESS on success.
+ *
+ * @param   enmEvent        Power Management event
+ */
+RTDECL(int) RTPowerSignalEvent(RTPOWEREVENT enmEvent);
+
+#endif /* IN_RING0 */
+
+/** @} */
+
+RT_C_DECLS_END
+
+#endif /* !IPRT_INCLUDED_power_h */
+