8d5f159687
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27865 a1c6a512-1295-4272-9138-f99709370657
296 lines
8.2 KiB
C
296 lines
8.2 KiB
C
/***************************************************************************
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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) 2002 by Daniel Stenberg
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*
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* iPod driver based on code from the ipodlinux project - http://ipodlinux.org
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* Adapted for Rockbox in December 2005
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* Original file: linux/arch/armnommu/mach-ipod/keyboard.c
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* Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
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*
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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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/*
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* Rockbox button functions
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*/
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#include <stdlib.h>
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#include "config.h"
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#include "cpu.h"
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#include "system.h"
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#include "button.h"
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#include "kernel.h"
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#include "backlight.h"
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#include "serial.h"
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#include "power.h"
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#include "powermgmt.h"
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#define WHEELCLICKS_PER_ROTATION 96
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#define WHEEL_BASE_SENSITIVITY 6 /* Compute every ... clicks */
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#define WHEEL_REPEAT_VELOCITY 45 /* deg/s */
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#define WHEEL_SMOOTHING_VELOCITY 100 /* deg/s */
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/* Variable to use for setting button status in interrupt handler */
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int int_btn = BUTTON_NONE;
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static void handle_scroll_wheel(int new_scroll)
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{
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static const signed char scroll_state[4][4] = {
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{0, 1, -1, 0},
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{-1, 0, 0, 1},
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{1, 0, 0, -1},
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{0, -1, 1, 0}
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};
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static int prev_scroll = -1;
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static int direction = 0;
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static int count = 0;
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static long next_backlight_on = 0;
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int wheel_keycode = BUTTON_NONE;
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int scroll;
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static unsigned long wheel_delta = 1ul << 24;
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static unsigned long wheel_velocity = 0;
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static unsigned long last_wheel_usec = 0;
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static int prev_keypost = BUTTON_NONE;
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unsigned long usec;
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unsigned long v;
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if ( prev_scroll == -1 ) {
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prev_scroll = new_scroll;
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return;
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}
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scroll = scroll_state[prev_scroll][new_scroll];
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prev_scroll = new_scroll;
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if (direction != scroll) {
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/* direction reversal or was hold - reset all */
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direction = scroll;
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count = 0;
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prev_keypost = BUTTON_NONE;
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wheel_velocity = 0;
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wheel_delta = 1ul << 24;
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return;
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}
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/* poke backlight every 1/4s of activity */
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if (TIME_AFTER(current_tick, next_backlight_on)) {
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backlight_on();
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reset_poweroff_timer();
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next_backlight_on = current_tick + HZ/4;
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}
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if (++count < WHEEL_BASE_SENSITIVITY)
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return;
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count = 0;
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/* Mini 1st Gen wheel has inverse direction mapping
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* compared to 1st..3rd Gen wheel. */
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switch (direction) {
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case 1:
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wheel_keycode = BUTTON_SCROLL_FWD;
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break;
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case -1:
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wheel_keycode = BUTTON_SCROLL_BACK;
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break;
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default:
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/* only happens if we get out of sync */
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break;
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}
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/* have a keycode */
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usec = USEC_TIMER;
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v = usec - last_wheel_usec;
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/* calculate deg/s based upon sensitivity-adjusted interrupt period */
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if ((long)v <= 0) {
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/* timer wrapped (no activity for awhile), skip acceleration */
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v = 0;
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wheel_delta = 1ul << 24;
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}
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else {
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if (v > 0xfffffffful/WHEELCLICKS_PER_ROTATION) {
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v = 0xfffffffful/WHEELCLICKS_PER_ROTATION; /* check overflow below */
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}
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v = 360000000ul*WHEEL_BASE_SENSITIVITY / (v*WHEELCLICKS_PER_ROTATION);
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if (v > 0xfffffful)
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v = 0xfffffful; /* limit to 24 bits */
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}
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if (v < WHEEL_SMOOTHING_VELOCITY) {
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/* very slow - no smoothing */
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wheel_velocity = v;
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/* ensure backlight never gets stuck for an extended period if tick
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* wrapped such that next poke is very far ahead */
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next_backlight_on = current_tick - 1;
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}
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else {
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/* some velocity filtering to smooth things out */
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wheel_velocity = (7*wheel_velocity + v) / 8;
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}
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if (queue_empty(&button_queue)) {
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int key = wheel_keycode;
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if (v >= WHEEL_REPEAT_VELOCITY && prev_keypost == key) {
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/* quick enough and same key is being posted more than once in a
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* row - generate repeats - use unsmoothed v to guage */
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key |= BUTTON_REPEAT;
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}
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prev_keypost = wheel_keycode;
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/* post wheel keycode with wheel data */
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queue_post(&button_queue, key,
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(wheel_velocity >= WHEEL_ACCEL_START ? (1ul << 31) : 0)
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| wheel_delta | wheel_velocity);
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/* message posted - reset delta */
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wheel_delta = 1ul << 24;
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}
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else {
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/* skipped post - increment delta and limit to 7 bits */
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wheel_delta += 1ul << 24;
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if (wheel_delta > (0x7ful << 24))
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wheel_delta = 0x7ful << 24;
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}
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last_wheel_usec = usec;
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}
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/* mini 1 only, mini 2G uses iPod 4G code */
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static int ipod_mini_button_read(void)
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{
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unsigned char source, wheel_source, state, wheel_state;
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int btn = BUTTON_NONE;
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/* The ipodlinux source had a udelay(250) here, but testing has shown that
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it is not needed - tested on mini 1g. */
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/* udelay(250);*/
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/* get source(s) of interupt */
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source = GPIOA_INT_STAT & 0x3f;
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wheel_source = GPIOB_INT_STAT & 0x30;
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if (source == 0 && wheel_source == 0) {
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return BUTTON_NONE; /* not for us */
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}
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/* get current keypad & wheel status */
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state = GPIOA_INPUT_VAL & 0x3f;
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wheel_state = GPIOB_INPUT_VAL & 0x30;
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/* toggle interrupt level */
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GPIOA_INT_LEV = ~state;
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GPIOB_INT_LEV = ~wheel_state;
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/* ack any active interrupts */
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if (source)
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GPIOA_INT_CLR = source;
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if (wheel_source)
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GPIOB_INT_CLR = wheel_source;
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if (button_hold())
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return BUTTON_NONE;
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/* hold switch causes all outputs to go low */
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/* we shouldn't interpret these as key presses */
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if (!(state & 0x1))
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btn |= BUTTON_SELECT;
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if (!(state & 0x2))
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btn |= BUTTON_MENU;
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if (!(state & 0x4))
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btn |= BUTTON_PLAY;
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if (!(state & 0x8))
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btn |= BUTTON_RIGHT;
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if (!(state & 0x10))
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btn |= BUTTON_LEFT;
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if (wheel_source & 0x30) {
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handle_scroll_wheel((wheel_state & 0x30) >> 4);
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}
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return btn;
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}
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void ipod_mini_button_int(void)
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{
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CPU_HI_INT_DIS = GPIO0_MASK;
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int_btn = ipod_mini_button_read();
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//CPU_INT_EN = 0x40000000;
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CPU_HI_INT_EN = GPIO0_MASK;
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}
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void button_init_device(void)
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{
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/* iPod Mini G1 */
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/* buttons - enable as input */
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GPIOA_ENABLE |= 0x3f;
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GPIOA_OUTPUT_EN &= ~0x3f;
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/* scroll wheel- enable as input */
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GPIOB_ENABLE |= 0x30; /* port b 4,5 */
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GPIOB_OUTPUT_EN &= ~0x30; /* port b 4,5 */
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/* buttons - set interrupt levels */
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GPIOA_INT_LEV = ~(GPIOA_INPUT_VAL & 0x3f);
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GPIOA_INT_CLR = GPIOA_INT_STAT & 0x3f;
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/* scroll wheel - set interrupt levels */
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GPIOB_INT_LEV = ~(GPIOB_INPUT_VAL & 0x30);
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GPIOB_INT_CLR = GPIOB_INT_STAT & 0x30;
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/* enable interrupts */
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GPIOA_INT_EN = 0x3f;
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GPIOB_INT_EN = 0x30;
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/* unmask interrupt */
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CPU_INT_EN = 0x40000000;
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CPU_HI_INT_EN = GPIO0_MASK;
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}
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/*
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* Get button pressed from hardware
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*/
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int button_read_device(void)
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{
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static bool hold_button = false;
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bool hold_button_old;
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/* normal buttons */
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hold_button_old = hold_button;
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hold_button = button_hold();
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if (hold_button != hold_button_old)
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backlight_hold_changed(hold_button);
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/* The int_btn variable is set in the button interrupt handler */
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return int_btn;
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}
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bool button_hold(void)
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{
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return (GPIOA_INPUT_VAL & 0x20)?false:true;
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}
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bool headphones_inserted(void)
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{
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return (GPIOA_INPUT_VAL & 0x80)?true:false;
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}
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