firmware/target/arm/as3525/sansa-fuzev2/button-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
  22 #include "config.h"
  23 #include "system.h"
  24 #include "button.h"
  25 #include "backlight.h"
  26
  27 extern void scrollwheel(unsigned wheel_value);
  28
  29 #ifdef HAS_BUTTON_HOLD
  30 static bool hold_button = false;
  31 #endif
  32 void button_init_device(void)
  33 {
  34     GPIOA_DIR &= ~(1<<6|1<<7);
  35     GPIOC_DIR = 0;
  36     GPIOB_DIR |= (1<<4)|(1<<0);
  37
  38     GPIOB_PIN(4) = 1<<4; /* activate the wheel */
  39 }
  40
  41 void get_scrollwheel(void)
  42 {
  43 #if defined(HAVE_SCROLLWHEEL) && !defined(BOOTLOADER)
  44     /* scroll wheel handling */
  45
  46 #define GPIOA_PIN76_offset ((1<<(6+2)) | (1<<(7+2)))
  47 #define GPIOA_PIN76 (*(volatile unsigned char*)(GPIOA_BASE+GPIOA_PIN76_offset))
  48     scrollwheel(GPIOA_PIN76 >> 6);
  49
  50 #endif
  51 }
  52
  53 /*
  54  * Get button pressed from hardware
  55  */
  56
  57
  58 int button_read_device(void)
  59 {
  60     int btn = 0;
  61     volatile int delay;
  62     static bool hold_button_old = false;
  63     static long power_counter = 0;
  64     unsigned gpiod6;
  65
  66     /* if we remove this delay, we see screen corruption (the higher the CPU
  67      * frequency the higher the corruption) */
  68     for(delay = 1000; delay; delay--)
  69         nop;
  70
  71     get_scrollwheel();
  72
  73     CCU_IO &= ~(1<<12);
  74
  75     GPIOB_PIN(0) = 1<<0;
  76     for(delay = 500; delay; delay--)
  77         nop;
  78
  79     gpiod6 = GPIOD_PIN(6);
  80
  81     GPIOB_PIN(0) = 0;
  82     for(delay = 240; delay; delay--)
  83         nop;
  84
  85     if (GPIOC_PIN(1) & 1<<1)
  86         btn |= BUTTON_DOWN;
  87     if (GPIOC_PIN(2) & 1<<2)
  88         btn |= BUTTON_UP;
  89     if (GPIOC_PIN(3) & 1<<3)
  90         btn |= BUTTON_LEFT;
  91     if (GPIOC_PIN(4) & 1<<4)
  92         btn |= BUTTON_SELECT;
  93     if (GPIOC_PIN(5) & 1<<5)
  94         btn |= BUTTON_RIGHT;
  95     if (GPIOB_PIN(1) & 1<<1)
  96         btn |= BUTTON_HOME;
  97     if (gpiod6 & 1<<6)
  98     {   /* power/hold is on the same pin. we know it's hold if the bit isn't
  99          * set now anymore */
 100         if (GPIOD_PIN(6) & 1<<6)
 101         {
 102             hold_button = false;
 103             btn |= BUTTON_POWER;
 104         }
 105         else
 106         {
 107             hold_button = true;
 108         }
 109     }
 110
 111     CCU_IO |= 1<<12;
 112
 113 #ifdef HAS_BUTTON_HOLD
 114 #ifndef BOOTLOADER
 115     /* light handling */
 116     if (hold_button != hold_button_old)
 117     {
 118         hold_button_old = hold_button;
 119         backlight_hold_changed(hold_button);
 120     }
 121 #else
 122     (void)hold_button_old;
 123 #endif
 124     if (hold_button)
 125     {
 126         power_counter = HZ;
 127         return 0;
 128     }
 129     /* read power, but not if hold button was just released, since
 130      * you basically always hit power due to the slider mechanism after releasing
 131      * (fuze only)
 132      */
 133     else if (power_counter > 0)
 134     {
 135         power_counter--;
 136         btn &= ~BUTTON_POWER;
 137     }
 138 #endif
 139     return btn;
 140 }
 141
 142 #ifdef HAS_BUTTON_HOLD
 143 bool button_hold(void)
 144 {
 145     return hold_button;
 146 }
 147 #endif