firmware/target/arm/as3525/sansa-c200v2/backlight-c200v2.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006 by Barry Wardell
  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 int backlight_is_on = 0;
  31 static int backlight_level = 0;
  32
  33 /* logarithmic lookup table for brightness s*/
  34 static const int brightness_table[MAX_BRIGHTNESS_SETTING+1] = {
  35     0, 21, 47, 78, 118, 165, 224, 296, 386, 495, 630, 796, 1000
  36 };
  37
  38 static void _ll_backlight_on(void)
  39 {
  40     GPIOA_PIN(5) = 1<<5;
  41 }
  42
  43 static void _ll_backlight_off(void)
  44 {
  45     GPIOA_PIN(5) = 0;
  46 }
  47
  48 void _backlight_pwm(int on)
  49 {
  50     if (on) {
  51         _ll_backlight_on();
  52     } else {
  53         _ll_backlight_off();
  54     }
  55 }
  56
  57 bool _backlight_init(void)
  58 {
  59     GPIOA_DIR |= 1<<5;
  60     return true;
  61 }
  62
  63 void _backlight_set_brightness(int brightness)
  64 {
  65     backlight_level = brightness_table[brightness];
  66
  67     if (brightness > 0)
  68         _backlight_on();
  69     else
  70         _backlight_off();
  71 }
  72
  73 void _backlight_on(void)
  74 {
  75 #ifdef HAVE_LCD_ENABLE
  76     lcd_enable(true); /* power on lcd + visible display */
  77 #endif
  78     if (!backlight_is_on)
  79         _ll_backlight_on();
  80     _set_timer2_pwm_ratio(backlight_level);
  81     backlight_is_on = 1;
  82 }
  83
  84 void _backlight_off(void)
  85 {
  86     backlight_is_on = 0;
  87     _set_timer2_pwm_ratio(0);
  88     _ll_backlight_off();
  89 #ifdef HAVE_LCD_ENABLE
  90     lcd_enable(false); /* power off visible display */
  91 #endif
  92 }
  93
  94 void _buttonlight_on(void)
  95 {
  96     /* Needed for buttonlight and MicroSD to work at the same time */
  97     /* Turn ROD control on, as the OF does */
  98     GPIOD_DIR |= (1<<7);
  99     SD_MCI_POWER |= (1<<7);
 100     GPIOD_PIN(7) = (1<<7);
 101     buttonlight_is_on = 1;
 102 }
 103
 104 void _buttonlight_off(void)
 105 {
 106     /* Needed for buttonlight and MicroSD to work at the same time */
 107     /* Turn ROD control off, as the OF does */
 108     SD_MCI_POWER &= ~(1<<7);
 109     GPIOD_PIN(7) = 0;
 110     GPIOD_DIR &= ~(1<<7);
 111     buttonlight_is_on = 0;
 112 }