firmware/export/backlight-sw-fading.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2008 by Thomas Martitz
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #ifndef BACKLIGHT_THREAD_FADING_H
  23 #define BACKLIGHT_THREAD_FADING_H
  24
  25 /* delay supposed to be MAX_BRIGHTNESS_SETTING*2 rounded to the next multiple
  26  * of 5, however not more than 40 */
  27 #define _FADE_DELAY (((MAX_BRIGHTNESS_SETTING*2+4)/5)*5)
  28 #define FADE_DELAY (HZ/(MIN(_FADE_DELAY, 40)))
  29
  30 void _backlight_fade_update_state(int brightness);
  31 bool _backlight_fade_step(int direction);
  32
  33 /* enum used for both, fading state and fading type selected through the settings */
  34
  35 enum {
  36     NOT_FADING = 0,
  37     FADING_UP,
  38     FADING_DOWN,
  39 };
  40
  41 #endif /* _BACKLIGHT_THREAD_FADING_ */