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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 "serial.h"
#include "power.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
#define WHEELCLICKS_PER_ROTATION 96
#define WHEEL_BASE_SENSITIVITY 6 /* Compute every ... clicks */
#define WHEEL_REPEAT_VELOCITY 45 /* deg/s */
#define WHEEL_SMOOTHING_VELOCITY 100 /* deg/s */
static void handle_scroll_wheel(int new_scroll)
{
static const signed char scroll_state[4][4] = {
{0, 1, -1, 0},
{-1, 0, 0, 1},
{1, 0, 0, -1},
{0, -1, 1, 0}
};
static int prev_scroll = -1;
static int direction = 0;
static int count = 0;
static long nextbacklight_hw_on = 0;
static unsigned long last_wheel_usec = 0;
static unsigned long wheel_delta = 1ul << 24;
static unsigned long wheel_velocity = 0;
static int prev_keypost = BUTTON_NONE;
int wheel_keycode = BUTTON_NONE;
int scroll;
unsigned long usec;
unsigned long v;
if (prev_scroll == -1) {
prev_scroll = new_scroll;
return;
}
scroll = scroll_state[prev_scroll][new_scroll];
prev_scroll = new_scroll;
if (direction != scroll) {
/* direction reversal or was hold - reset all */
direction = scroll;
prev_keypost = BUTTON_NONE;
wheel_velocity = 0;
wheel_delta = 1ul << 24;
count = 0;
}
/* poke backlight every 1/4s of activity */
if (TIME_AFTER(current_tick, nextbacklight_hw_on)) {
backlight_on();
reset_poweroff_timer();
nextbacklight_hw_on = current_tick + HZ/4;
}
/* has wheel travelled far enough? */
if (++count < WHEEL_BASE_SENSITIVITY) {
return;
}
/* reset travel count and do calculations */
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 */
return;
}
/* have a keycode */
usec = USEC_TIMER;
v = usec - last_wheel_usec;
/* calculate deg/s based upon sensitivity-adjusted interrupt period */
if ((long)v <= 0) {
/* timer wrapped (no activity for awhile), skip acceleration */
v = 0;
wheel_delta = 1ul << 24;
}
else {
if (v > 0xfffffffful/WHEELCLICKS_PER_ROTATION) {
v = 0xfffffffful/WHEELCLICKS_PER_ROTATION; /* check overflow below */
}
v = 360000000ul*WHEEL_BASE_SENSITIVITY / (v*WHEELCLICKS_PER_ROTATION);
if (v > 0xfffffful)
v = 0xfffffful; /* limit to 24 bits */
}
if (v < WHEEL_SMOOTHING_VELOCITY) {
/* very slow - no smoothing */
wheel_velocity = v;
/* ensure backlight never gets stuck for an extended period if tick
* wrapped such that next poke is very far ahead */
nextbacklight_hw_on = current_tick - 1;
}
else {
/* some velocity filtering to smooth things out */
wheel_velocity = (7*wheel_velocity + v) / 8;
}
if (button_queue_empty()) {
int key = wheel_keycode;
if (v >= WHEEL_REPEAT_VELOCITY && prev_keypost == key) {
/* quick enough and same key is being posted more than once in a
* row - generate repeats - use unsmoothed v to guage */
key |= BUTTON_REPEAT;
}
prev_keypost = wheel_keycode;
/* post wheel keycode with wheel data */
button_queue_post(key,
(wheel_velocity >= WHEEL_ACCEL_START ? (1ul << 31) : 0)
| wheel_delta | wheel_velocity);
/* message posted - reset delta */
wheel_delta = 1ul << 24;
}
else {
/* skipped post - increment delta and limit to 7 bits */
wheel_delta += 1ul << 24;
if (wheel_delta > (0x7ful << 24))
wheel_delta = 0x7ful << 24;
}
last_wheel_usec = usec;
}
static int ipod_3g_button_read(void)
{
unsigned char source, state;
int btn = BUTTON_NONE;
/* get source of interupts */
source = GPIOA_INT_STAT;
/* get current keypad status */
state = GPIOA_INPUT_VAL;
/* toggle interrupt level */
GPIOA_INT_LEV = ~state;
/* ack any active interrupts */
GPIOA_INT_CLR = source;
#ifdef IPOD_3G
static bool was_hold = false;
if (was_hold && source == 0x40 && state == 0xbf) {
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 */
return BUTTON_NONE;
}
#elif defined IPOD_1G2G
if (state & 0x20) {
/* 1g/2g hold switch is active high */
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);
}
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) != 2)
{ /* 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) != 2)
{
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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