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 unsigned read_GPIOA_67(void)
  42 {
  43     unsigned ret = 0;
  44     volatile int i;
  45     DBOP_CTRL |= 1<<19;
  46     for(i = 20; i; i--) nop;
  47     GPIOA_DIR &= ~0xc0;
  48     for(i = 20; i; i--) nop;
  49     if (GPIOA_PIN(6) != 0)
  50         ret = 1<<0;
  51     for(i = 20; i; i--) nop;
  52     if (GPIOA_PIN(7) != 0)
  53         ret |= 1<<1;
  54     DBOP_CTRL &= ~(1<<19);
  55     for(i = 20; i; i--) nop;
  56     return ret;
  57 }
  58
  59 void get_scrollwheel(void)
  60 {
  61 #if defined(HAVE_SCROLLWHEEL) && !defined(BOOTLOADER)
  62     /* scroll wheel handling */
  63     scrollwheel(read_GPIOA_67());
  64 #endif
  65 }
  66
  67 /*
  68  * Get button pressed from hardware
  69  */
  70
  71
  72 int button_read_device(void)
  73 {
  74     int btn = 0;
  75     volatile int delay;
  76     static bool hold_button_old = false;
  77     static long power_counter = 0;
  78     unsigned gpiod6;
  79
  80     get_scrollwheel();
  81
  82     CCU_IO &= ~(1<<12);
  83
  84     GPIOB_PIN(0) = 1<<0;
  85     for(delay = 500; delay; delay--)
  86         nop;
  87
  88     gpiod6 = GPIOD_PIN(6);
  89
  90     GPIOB_PIN(0) = 0;
  91     for(delay = 240; delay; delay--)
  92         nop;
  93
  94     if (GPIOC_PIN(1) & 1<<1)
  95         btn |= BUTTON_DOWN;
  96     if (GPIOC_PIN(2) & 1<<2)
  97         btn |= BUTTON_UP;
  98     if (GPIOC_PIN(3) & 1<<3)
  99         btn |= BUTTON_LEFT;
 100     if (GPIOC_PIN(4) & 1<<4)
 101         btn |= BUTTON_SELECT;
 102     if (GPIOC_PIN(5) & 1<<5)
 103         btn |= BUTTON_RIGHT;
 104     if (GPIOB_PIN(1) & 1<<1)
 105         btn |= BUTTON_HOME;
 106     if (gpiod6 & 1<<6)
 107     {   /* power/hold is on the same pin. we know it's hold if the bit isn't
 108          * set now anymore */
 109         if (GPIOD_PIN(6) & 1<<6)
 110         {
 111             hold_button = false;
 112             btn |= BUTTON_POWER;
 113         }
 114         else
 115         {
 116             hold_button = true;
 117         }
 118     }
 119
 120     CCU_IO |= 1<<12;
 121
 122 #ifdef HAS_BUTTON_HOLD
 123 #ifndef BOOTLOADER
 124     /* light handling */
 125     if (hold_button != hold_button_old)
 126     {
 127         hold_button_old = hold_button;
 128         backlight_hold_changed(hold_button);
 129     }
 130 #else
 131     (void)hold_button_old;
 132 #endif
 133     if (hold_button)
 134     {
 135         power_counter = HZ;
 136         return 0;
 137     }
 138     /* read power, but not if hold button was just released, since
 139      * you basically always hit power due to the slider mechanism after releasing
 140      * (fuze only)
 141      */
 142     else if (power_counter > 0)
 143     {
 144         power_counter--;
 145         btn &= ~BUTTON_POWER;
 146     }
 147 #endif
 148     return btn;
 149 }
 150
 151 #ifdef HAS_BUTTON_HOLD
 152 bool button_hold(void)
 153 {
 154     return hold_button;
 155 }
 156 #endif