platform_bootable_recovery/device.h

/*
 * 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:
  explicit Device(RecoveryUI* ui) : ui_(ui) {}
  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() {
    return ui_;
  }

  // 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() {};

  // 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.
  //
  // Returns 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, bool visible);

  enum BuiltinAction {
    NO_ACTION = 0,
    REBOOT = 1,
    APPLY_SDCARD = 2,
    // APPLY_CACHE was 3.
    APPLY_ADB_SIDELOAD = 4,
    WIPE_DATA = 5,
    WIPE_CACHE = 6,
    REBOOT_BOOTLOADER = 7,
    SHUTDOWN = 8,
    VIEW_RECOVERY_LOGS = 9,
    MOUNT_SYSTEM = 10,
    RUN_GRAPHICS_TEST = 11,
    RUN_LOCALE_TEST = 12,
  };

  // 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();

  // 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 HandleMenuKey(). 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);

  static const int kNoAction = -1;
  static const int kHighlightUp = -2;
  static const int kHighlightDown = -3;
  static const int kInvokeItem = -4;

  // Called before and after 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 image manually and
  // selects the option from the menu, to perform whatever device-specific wiping actions as needed.
  // Returns true on success; returning false from PreWipeData will prevent the regular wipe, and
  // returning false from PostWipeData will cause the wipe to be considered a failure.
  virtual bool PreWipeData() {
    return true;
  }

  virtual bool PostWipeData() {
    return true;
  }

 private:
  RecoveryUI* ui_;
};

// 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