firmware/target/arm/as3525/sansa-fuzev2/backlight-fuzev2.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2010 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 #include "config.h"
  22 #include "backlight-target.h"
  23 #include "system.h"
  24 #include "lcd.h"
  25 #include "backlight.h"
  26 #include "ascodec-target.h"
  27 #include "as3514.h"
  28
  29 int buttonlight_is_on = 0;
  30
  31 static int brightness_internal = 0;
  32
  33 /* not functional */
  34 void _backlight_set_brightness(int brightness)
  35 {
  36     //ascodec_write(AS3514_DCDC15, brightness);
  37     brightness_internal = brightness << 2;
  38     brightness_internal += brightness + 5;
  39     brightness_internal <<= 25;
  40     brightness_internal >>= 24;
  41     ascodec_write(0x1c, 2); // sub register
  42     ascodec_write(0x1b, brightness_internal|0xff);
  43 }
  44
  45 bool _backlight_init(void)
  46 {
  47     GPIOB_DIR |= 1<<5; /* for buttonlight, stuff below seems to be needed
  48                           for buttonlight as well*/
  49     ascodec_write(0x1c, 1); // sub register
  50     ascodec_write(0x1b, ascodec_read(0x1b)|0x80);
  51     return true;
  52 }
  53
  54 /* not functional */
  55 void _backlight_on(void)
  56 {
  57 #ifdef HAVE_LCD_ENABLE
  58     lcd_enable(true); /* power on lcd + visible display */
  59 #endif
  60 #if (CONFIG_BACKLIGHT_FADING != BACKLIGHT_FADING_SW_SETTING) /* in bootloader/sim */
  61     /* if we set the brightness to the settings value, then fading up
  62      * is glitchy */
  63     ascodec_write(0x1c, 2); // sub register
  64     ascodec_write(0x1b, brightness_internal);
  65 #endif
  66 }
  67
  68 /* not functional */
  69 void _backlight_off(void)
  70 {
  71     ascodec_write(0x1c, 1); // sub register
  72     ascodec_write(0x1b, ascodec_read(0x1b) & ~0x80);
  73 #ifdef HAVE_LCD_ENABLE
  74     lcd_enable(false); /* power off visible display */
  75 #endif
  76 }
  77
  78 void _buttonlight_on(void)
  79 {
  80     GPIOB_PIN(5) = (1<<5);
  81     buttonlight_is_on = 1;
  82 }
  83
  84 void _buttonlight_off(void)
  85 {
  86     GPIOB_PIN(5) = 0;
  87     buttonlight_is_on = 0;
  88 }