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     static bool hold_button_old = false;
  62     static long power_counter = 0;
  63     unsigned gpiod6;
  64
  65
  66     /* if we don't wait for the fifo to empty, we'll see screen corruption
  67      * (the higher the CPU frequency the higher the corruption) */
  68     while ((DBOP_STAT & (1<<10)) == 0);
  69
  70     get_scrollwheel();
  71
  72     CCU_IO &= ~(1<<12);
  73
  74     GPIOB_PIN(0) = 1<<0;
  75     udelay(1);
  76
  77     gpiod6 = GPIOD_PIN(6);
  78
  79     GPIOB_PIN(0) = 0;
  80     udelay(1);
  81
  82     if (GPIOC_PIN(1) & 1<<1)
  83         btn |= BUTTON_DOWN;
  84     if (GPIOC_PIN(2) & 1<<2)
  85         btn |= BUTTON_UP;
  86     if (GPIOC_PIN(3) & 1<<3)
  87         btn |= BUTTON_LEFT;
  88     if (GPIOC_PIN(4) & 1<<4)
  89         btn |= BUTTON_SELECT;
  90     if (GPIOC_PIN(5) & 1<<5)
  91         btn |= BUTTON_RIGHT;
  92     if (GPIOB_PIN(1) & 1<<1)
  93         btn |= BUTTON_HOME;
  94     if (gpiod6 & 1<<6)
  95     {   /* power/hold is on the same pin. we know it's hold if the bit isn't
  96          * set now anymore */
  97         if (GPIOD_PIN(6) & 1<<6)
  98         {
  99             hold_button = false;
 100             btn |= BUTTON_POWER;
 101         }
 102         else
 103         {
 104             hold_button = true;
 105         }
 106     }
 107
 108     CCU_IO |= 1<<12;
 109
 110 #ifdef HAS_BUTTON_HOLD
 111 #ifndef BOOTLOADER
 112     /* light handling */
 113     if (hold_button != hold_button_old)
 114     {
 115         hold_button_old = hold_button;
 116         backlight_hold_changed(hold_button);
 117     }
 118 #else
 119     (void)hold_button_old;
 120 #endif
 121     if (hold_button)
 122     {
 123         power_counter = HZ;
 124         return 0;
 125     }
 126     /* read power, but not if hold button was just released, since
 127      * you basically always hit power due to the slider mechanism after releasing
 128      * (fuze only)
 129      */
 130     else if (power_counter > 0)
 131     {
 132         power_counter--;
 133         btn &= ~BUTTON_POWER;
 134     }
 135 #endif
 136     return btn;
 137 }
 138
 139 #ifdef HAS_BUTTON_HOLD
 140 bool button_hold(void)
 141 {
 142     return hold_button;
 143 }
 144 #endif