text: /***************************************************************************
   *             __________               __   ___.
   *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   *                     \/            \/     \/    \/            \/
   *
   * Copyright (C) 2011 by Lorenzo Miori
   *
   * 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; either version 2
   * of the License, or (at your option) any later version.
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   * KIND, either express or implied.
   *
   ****************************************************************************/
  #include "config.h"
  #include "system.h"
  #include "backlight.h"
  #include "backlight-target.h"
  #include "lcd.h"
  #include "as3514.h"
  #include "ascodec.h"
  #include <fcntl.h>
  #include "unistd.h"
  
  static bool backlight_on_status = true; /* Is on or off? */
  
  bool backlight_hw_init(void)
  {
      /* We have nothing to do */
      return true;
  }
  
  void backlight_hw_on(void)
  {
      if (!backlight_on_status)
      {
          /* Turn on lcd power before backlight */
  #ifdef HAVE_LCD_ENABLE
          lcd_enable(true);
  #endif
          /* Original app sets this to 0xb1 when backlight is on... */
          ascodec_write_pmu(AS3543_BACKLIGHT, 0x1, 0xb1);
      }
  
      backlight_on_status = true;
  
  }
  
  void backlight_hw_off(void)
  {
      if (backlight_on_status)
      {
          /* Disabling the DCDC15 completely, keeps brightness register value */
          ascodec_write_pmu(AS3543_BACKLIGHT, 0x1, 0x00);
          /* Turn off lcd power then */
  #ifdef HAVE_LCD_ENABLE
          lcd_enable(false);
  #endif
      }
  
      backlight_on_status = false;
  }
  
  void backlight_hw_brightness(int brightness)
  {
      /* Just another check... */
      if (brightness > MAX_BRIGHTNESS_SETTING)
          brightness = MAX_BRIGHTNESS_SETTING;
      if (brightness < MIN_BRIGHTNESS_SETTING)
          brightness = MIN_BRIGHTNESS_SETTING;
      ascodec_write_pmu(AS3543_BACKLIGHT, 0x3, brightness << 3 & 0xf8);
  }
  