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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Daniel Stenberg
*
* iPod driver based on code from the ipodlinux project - http://ipodlinux.org
* Adapted for Rockbox in December 2005
* Original file: linux/arch/armnommu/mach-ipod/keyboard.c
* Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
/*
* Rockbox button functions
*/
#include <stdlib.h>
#include "config.h"
#include "cpu.h"
#include "system.h"
#include "button.h"
#include "kernel.h"
#include "backlight.h"
#include "adc.h"
#include "serial.h"
#include "power.h"
#include "system.h"
#include "powermgmt.h"
#include "hwcompat.h"
static int int_btn = BUTTON_NONE;
#ifdef IPOD_1G2G
/* The 1st Gen wheel draws ~12mA when enabled permanently. Therefore
* we only enable it for a very short time to check for changes every
* tick, and only keep it enabled if there is activity. */
#define WHEEL_TIMEOUT (HZ/4)
#endif
static void handle_scroll_wheel(int new_scroll, int was_hold)
{
int wheel_keycode = BUTTON_NONE;
static int prev_scroll = -1;
static int direction = 0;
static int count = 0;
static int scroll_state[4][4] = {
{0, 1, -1, 0},
{-1, 0, 0, 1},
{1, 0, 0, -1},
{0, -1, 1, 0}
};
if ( prev_scroll == -1 ) {
prev_scroll = new_scroll;
}
else if (direction != scroll_state[prev_scroll][new_scroll]) {
direction = scroll_state[prev_scroll][new_scroll];
count = 0;
}
else if (!was_hold) {
backlight_on();
reset_poweroff_timer();
if (++count == 6) { /* reduce sensitivity */
count = 0;
/* 1st..3rd Gen wheel has inverse direction mapping
* compared to Mini 1st Gen wheel. */
switch (direction) {
case 1:
wheel_keycode = BUTTON_SCROLL_BACK;
break;
case -1:
wheel_keycode = BUTTON_SCROLL_FWD;
break;
default:
/* only happens if we get out of sync */
break;
}
}
}
if (wheel_keycode != BUTTON_NONE && queue_empty(&button_queue))
queue_post(&button_queue, wheel_keycode, 0);
prev_scroll = new_scroll;
}
static int ipod_3g_button_read(void)
{
unsigned char source, state;
static bool was_hold = false;
int btn = BUTTON_NONE;
#ifdef IPOD_3G
/* The following delay was 250 in the ipodlinux source,
* but 50 seems to work fine. 250 causes the wheel to stop
* working when spinning it real fast. */
udelay(50);
#endif
/* get source of interupts */
source = GPIOA_INT_STAT;
/* get current keypad status */
state = GPIOA_INPUT_VAL;
/* toggle interrupt level */
GPIOA_INT_LEV = ~state;
#ifdef IPOD_3G
if (was_hold && source == 0x40 && state == 0xbf) {
/* ack any active interrupts */
GPIOA_INT_CLR = source;
return BUTTON_NONE;
}
was_hold = false;
if ((state & 0x20) == 0) {
/* 3g hold switch is active low */
was_hold = true;
/* hold switch on 3g causes all outputs to go low */
/* we shouldn't interpret these as key presses */
GPIOA_INT_CLR = source;
return BUTTON_NONE;
}
#elif defined IPOD_1G2G
if (state & 0x20) {
/* 1g/2g hold switch is active high */
GPIOA_INT_CLR = source;
return BUTTON_NONE;
}
#endif
if ((state & 0x1) == 0) {
btn |= BUTTON_RIGHT;
}
if ((state & 0x2) == 0) {
btn |= BUTTON_SELECT;
}
if ((state & 0x4) == 0) {
btn |= BUTTON_PLAY;
}
if ((state & 0x8) == 0) {
btn |= BUTTON_LEFT;
}
if ((state & 0x10) == 0) {
btn |= BUTTON_MENU;
}
if (source & 0xc0) {
handle_scroll_wheel((state & 0xc0) >> 6, was_hold);
}
/* ack any active interrupts */
GPIOA_INT_CLR = source;
return btn;
}
void ipod_3g_button_int(void)
{
CPU_INT_DIS = GPIO_MASK;
int_btn = ipod_3g_button_read();
CPU_INT_EN = GPIO_MASK;
}
void button_init_device(void)
{
GPIOA_ENABLE = 0xff;
GPIOA_OUTPUT_EN = 0;
GPIOA_INT_LEV = ~GPIOA_INPUT_VAL;
GPIOA_INT_CLR = GPIOA_INT_STAT;
#ifdef IPOD_1G2G
if ((IPOD_HW_REVISION >> 16) == 1)
{ /* enable scroll wheel */
GPIOB_ENABLE |= 0x01;
GPIOB_OUTPUT_EN |= 0x01;
GPIOB_OUTPUT_VAL |= 0x01;
}
#endif
GPIOA_INT_EN = 0xff;
CPU_INT_EN = GPIO_MASK;
}
/*
* Get button pressed from hardware
*/
int button_read_device(void)
{
static bool hold_button = false;
bool hold_button_old;
#ifdef IPOD_1G2G
static int wheel_timeout = 0;
static unsigned char last_wheel_value = 0;
unsigned char wheel_value;
if ((IPOD_HW_REVISION >> 16) == 1)
{
if (!hold_button && (wheel_timeout == 0))
{
GPIOB_OUTPUT_VAL |= 0x01; /* enable wheel */
udelay(50); /* let the voltage settle */
}
wheel_value = GPIOA_INPUT_VAL >> 6;
if (wheel_value != last_wheel_value)
{
last_wheel_value = wheel_value;
wheel_timeout = WHEEL_TIMEOUT; /* keep wheel enabled */
GPIOA_INT_EN = 0xff; /* enable wheel interrupts */
}
if (wheel_timeout)
wheel_timeout--;
else
{
GPIOA_INT_EN = 0x3f; /* disable wheel interrupts */
GPIOB_OUTPUT_VAL &= ~0x01; /* disable wheel */
}
}
#endif
/* normal buttons */
hold_button_old = hold_button;
hold_button = button_hold();
if (hold_button != hold_button_old)
backlight_hold_changed(hold_button);
return int_btn;
}
bool button_hold(void)
{
#ifdef IPOD_1G2G
return (GPIOA_INPUT_VAL & 0x20);
#else
return !(GPIOA_INPUT_VAL & 0x20);
#endif
}
bool headphones_inserted(void)
{
#ifdef IPOD_1G2G
if ((IPOD_HW_REVISION >> 16) == 2)
{
/* 2G uses GPIO B bit 0 */
return (GPIOB_INPUT_VAL & 0x1)?true:false;
}
else
{
/* 1G has no headphone detection, so fake insertion */
return (true);
}
#else
/* 3G uses GPIO C bit 0 */
return (GPIOC_INPUT_VAL & 0x1)?true:false;
#endif
}
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