diff --git a/device.h b/device.h
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+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _RECOVERY_DEVICE_H
+#define _RECOVERY_DEVICE_H
+
+#include "ui.h"
+
+class Device {
+  public:
+    virtual ~Device() { }
+
+    // Called to obtain the UI object that should be used to display
+    // the recovery user interface for this device.  You should not
+    // have called Init() on the UI object already, the caller will do
+    // that after this method returns.
+    virtual RecoveryUI* GetUI() = 0;
+
+    // Called when recovery starts up (after the UI has been obtained
+    // and initialized and after the arguments have been parsed, but
+    // before anything else).
+    virtual void StartRecovery() { };
+
+    // enum KeyAction { NONE, TOGGLE, REBOOT };
+
+    // // Called in the input thread when a new key (key_code) is
+    // // pressed.  *key_pressed is an array of KEY_MAX+1 bytes
+    // // indicating which other keys are already pressed.  Return a
+    // // KeyAction to indicate action should be taken immediately.
+    // // These actions happen when recovery is not waiting for input
+    // // (eg, in the midst of installing a package).
+    // virtual KeyAction CheckImmediateKeyAction(volatile char* key_pressed, int key_code) = 0;
+
+    // Called from the main thread when recovery is at the main menu
+    // and waiting for input, and a key is pressed.  (Note that "at"
+    // the main menu does not necessarily mean the menu is visible;
+    // recovery will be at the main menu with it invisible after an
+    // unsuccessful operation [ie OTA package failure], or if recovery
+    // is started with no command.)
+    //
+    // key is the code of the key just pressed.  (You can call
+    // IsKeyPressed() on the RecoveryUI object you returned from GetUI
+    // if you want to find out if other keys are held down.)
+    //
+    // visible is true if the menu is visible.
+    //
+    // Return one of the defined constants below in order to:
+    //
+    //   - move the menu highlight (kHighlight{Up,Down})
+    //   - invoke the highlighted item (kInvokeItem)
+    //   - do nothing (kNoAction)
+    //   - invoke a specific action (a menu position: any non-negative number)
+    virtual int HandleMenuKey(int key, int visible) = 0;
+
+    enum BuiltinAction { NO_ACTION, REBOOT, APPLY_EXT, APPLY_CACHE,
+                         WIPE_DATA, WIPE_CACHE };
+
+    // Perform a recovery action selected from the menu.
+    // 'menu_position' will be the item number of the selected menu
+    // item, or a non-negative number returned from
+    // device_handle_key().  The menu will be hidden when this is
+    // called; implementations can call ui_print() to print
+    // information to the screen.  If the menu position is one of the
+    // builtin actions, you can just return the corresponding enum
+    // value.  If it is an action specific to your device, you
+    // actually perform it here and return NO_ACTION.
+    virtual BuiltinAction InvokeMenuItem(int menu_position) = 0;
+
+    static const int kNoAction = -1;
+    static const int kHighlightUp = -2;
+    static const int kHighlightDown = -3;
+    static const int kInvokeItem = -4;
+
+    // Called when we do a wipe data/factory reset operation (either via a
+    // reboot from the main system with the --wipe_data flag, or when the
+    // user boots into recovery manually and selects the option from the
+    // menu.)  Can perform whatever device-specific wiping actions are
+    // needed.  Return 0 on success.  The userdata and cache partitions
+    // are erased AFTER this returns (whether it returns success or not).
+    virtual int WipeData() { return 0; }
+
+    // Return the headers (an array of strings, one per line,
+    // NULL-terminated) for the main menu.  Typically these tell users
+    // what to push to move the selection and invoke the selected
+    // item.
+    virtual const char* const* GetMenuHeaders() = 0;
+
+    // Return the list of menu items (an array of strings,
+    // NULL-terminated).  The menu_position passed to InvokeMenuItem
+    // will correspond to the indexes into this array.
+    virtual const char* const* GetMenuItems() = 0;
+};
+
+// The device-specific library must define this function (or the
+// default one will be used, if there is no device-specific library).
+// It returns the Device object that recovery should use.
+Device* make_device();
+
+#endif  // _DEVICE_H