include/linux/earlysuspend.h

   1 /* include/linux/earlysuspend.h
   2  *
   3  * Copyright (C) 2007-2008 Google, Inc.
   4  *
   5  * This software is licensed under the terms of the GNU General Public
   6  * License version 2, as published by the Free Software Foundation, and
   7  * may be copied, distributed, and modified under those terms.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  */
  15
  16 #ifndef _LINUX_EARLYSUSPEND_H
  17 #define _LINUX_EARLYSUSPEND_H
  18
  19 #ifdef CONFIG_HAS_EARLYSUSPEND
  20 #include <linux/list.h>
  21 #endif
  22
  23 /* The early_suspend structure defines suspend and resume hooks to be called
  24  * when the user visible sleep state of the system changes, and a level to
  25  * control the order. They can be used to turn off the screen and input
  26  * devices that are not used for wakeup.
  27  * Suspend handlers are called in low to high level order, resume handlers are
  28  * called in the opposite order. If, when calling register_early_suspend,
  29  * the suspend handlers have already been called without a matching call to the
  30  * resume handlers, the suspend handler will be called directly from
  31  * register_early_suspend. This direct call can violate the normal level order.
  32  */
  33 enum {
  34         EARLY_SUSPEND_LEVEL_BLANK_SCREEN = 50,
  35         EARLY_SUSPEND_LEVEL_STOP_DRAWING = 100,
  36         EARLY_SUSPEND_LEVEL_DISABLE_FB = 150,
  37 };
  38 struct early_suspend {
  39 #ifdef CONFIG_HAS_EARLYSUSPEND
  40         struct list_head link;
  41         int level;
  42         void (*suspend)(struct early_suspend *h);
  43         void (*resume)(struct early_suspend *h);
  44 #endif
  45 };
  46
  47 #ifdef CONFIG_HAS_EARLYSUSPEND
  48 void register_early_suspend(struct early_suspend *handler);
  49 void unregister_early_suspend(struct early_suspend *handler);
  50 #else
  51 #define register_early_suspend(handler) do { } while (0)
  52 #define unregister_early_suspend(handler) do { } while (0)
  53 #endif
  54
  55 #endif
  56