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     if (c200v2_variant == 0) {
  41         GPIOA_PIN(5) = 1<<5;
  42     } else {
  43         GPIOA_PIN(7) = 1<<7;
  44     }
  45 }
  46
  47 static void _ll_backlight_off(void)
  48 {
  49     if (c200v2_variant == 0) {
  50         GPIOA_PIN(5) = 0;
  51     } else {
  52         GPIOA_PIN(7) = 0;
  53     }
  54 }
  55
  56 static void _ll_buttonlight_on(void)
  57 {
  58     if (c200v2_variant == 1) {
  59         /* Main buttonlight is on A5 */
  60         GPIOA_PIN(5) = 1<<5;
  61     } else {
  62         /* Needed for buttonlight and MicroSD to work at the same time */
  63         /* Turn ROD control on, as the OF does */
  64         GPIOD_DIR |= (1<<7);
  65         SD_MCI_POWER |= (1<<7);
  66         GPIOD_PIN(7) = (1<<7);
  67     }
  68 }
  69
  70 static void _ll_buttonlight_off(void)
  71 {
  72     if (c200v2_variant == 1) {
  73         /* Main buttonlight is on A5 */
  74         GPIOA_PIN(5) = 0;
  75     } else {
  76         /* Needed for buttonlight and MicroSD to work at the same time */
  77         /* Turn ROD control off, as the OF does */
  78         SD_MCI_POWER &= ~(1<<7);
  79         GPIOD_PIN(7) = 0;
  80         GPIOD_DIR &= ~(1<<7);
  81     }
  82 }
  83
  84 void _backlight_pwm(int on)
  85 {
  86     if (on) {
  87         if (backlight_is_on)
  88             _ll_backlight_on();
  89
  90         if (buttonlight_is_on)
  91             _ll_buttonlight_on();
  92     } else {
  93         if (backlight_is_on)
  94             _ll_backlight_off();
  95
  96         if (buttonlight_is_on)
  97             _ll_buttonlight_off();
  98     }
  99 }
 100
 101 bool _backlight_init(void)
 102 {
 103     GPIOA_DIR |= 1<<5;
 104     if (c200v2_variant == 1) {
 105         /* On this variant A7 is the backlight and
 106          * A5 is the buttonlight */
 107         GPIOA_DIR |= 1<<7;
 108     }
 109     return true;
 110 }
 111
 112 void _backlight_set_brightness(int brightness)
 113 {
 114     backlight_level = brightness_table[brightness];
 115
 116     if (brightness > 0)
 117         _backlight_on();
 118     else
 119         _backlight_off();
 120 }
 121
 122 static void _pwm_on(void)
 123 {
 124     _set_timer2_pwm_ratio(backlight_level);
 125 }
 126
 127 static void _pwm_off(void)
 128 {
 129     if (buttonlight_is_on == 0 && backlight_is_on == 0)
 130         _set_timer2_pwm_ratio(0);
 131 }
 132
 133 void _backlight_on(void)
 134 {
 135     if (backlight_is_on == 1) {
 136         /* Update pwm ratio in case user changed the brightness */
 137         _pwm_on();
 138         return;
 139     }
 140
 141 #ifdef HAVE_LCD_ENABLE
 142     lcd_enable(true); /* power on lcd + visible display */
 143 #endif
 144     _ll_backlight_on();
 145     _pwm_on();
 146     backlight_is_on = 1;
 147 }
 148
 149 void _backlight_off(void)
 150 {
 151     if (backlight_is_on == 0)
 152         return;
 153
 154     backlight_is_on = 0;
 155     _pwm_off();
 156     _ll_backlight_off();
 157 #ifdef HAVE_LCD_ENABLE
 158     lcd_enable(false); /* power off visible display */
 159 #endif
 160 }
 161
 162 void _buttonlight_on(void)
 163 {
 164     if (buttonlight_is_on == 1)
 165         return;
 166
 167     _ll_buttonlight_on();
 168     _pwm_on();
 169     buttonlight_is_on = 1;
 170 }
 171
 172 void _buttonlight_off(void)
 173 {
 174     if (buttonlight_is_on == 0)
 175         return;
 176
 177     buttonlight_is_on = 0;
 178     _pwm_off();
 179     _ll_buttonlight_off();
 180 }