104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2008 François Dinel
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* Copyright © 2008-2009 Rafaël Carré
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "button-target.h"
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#include "as3525v2.h"
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#include "kernel.h"
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#include "system-target.h"
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void button_init_device(void)
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{
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/* GPIO A6, A7 and D6 are direct button inputs */
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GPIOA_DIR &= ~(1 << 6);
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GPIOA_DIR &= ~(1 << 7);
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GPIOD_DIR &= ~(1 << 6);
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/* GPIO C1, C2, C3, C4, C5 are used in a column/row key scan matrix */
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GPIOC_DIR |= ((1 << 1) | (1 << 2));
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GPIOC_DIR &= ~((1 << 3) | (1 << 4) | (1 << 5));
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}
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/* TODO:
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Instead of using udelay to wait for buttons to settle, we could use a
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simple state machine to alternate between key matrix rows (like we do on
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the clip) and this way avoid burning cycles in the udelay.
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TODO:
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Figure out the real mappings from GPIOs to buttons.
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The current mapping is just an educated guess.
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*/
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int button_read_device(void)
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{
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int buttons = 0;
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/* power */
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if (GPIOD_PIN(6)) {
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buttons |= BUTTON_POWER;
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}
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/* volume */
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if (GPIOA_PIN(6)) {
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buttons |= BUTTON_VOL_DOWN;
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}
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if (GPIOA_PIN(7)) {
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buttons |= BUTTON_VOL_UP;
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}
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/* key matrix buttons, first row */
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GPIOC_PIN(1) = (1 << 1);
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GPIOC_PIN(2) = 0;
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udelay(500);
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if (GPIOC_PIN(3)) {
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buttons |= BUTTON_LEFT;
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}
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if (GPIOC_PIN(4)) {
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buttons |= BUTTON_SELECT;
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}
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if (GPIOC_PIN(5)) {
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buttons |= BUTTON_RIGHT;
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}
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/* key matrix buttons, second row */
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GPIOC_PIN(1) = 0;
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GPIOC_PIN(2) = (1 << 2);
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udelay(500);
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if (GPIOC_PIN(3)) {
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buttons |= BUTTON_UP;
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}
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if (GPIOC_PIN(4)) {
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buttons |= BUTTON_HOME;
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}
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if (GPIOC_PIN(5)) {
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buttons |= BUTTON_DOWN;
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}
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/* deselect scan rows */
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GPIOC_PIN(2) = 0;
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return buttons;
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}
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