2acc0ac542
later. We still need to hunt down snippets used that are not. 1324 modified files... http://www.rockbox.org/mail/archive/rockbox-dev-archive-2008-06/0060.shtml git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17847 a1c6a512-1295-4272-9138-f99709370657
272 lines
7 KiB
C
272 lines
7 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 "adc.h"
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#include "serial.h"
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#include "power.h"
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#include "system.h"
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#include "powermgmt.h"
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#include "hwcompat.h"
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static int int_btn = BUTTON_NONE;
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#ifdef IPOD_1G2G
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/* The 1st Gen wheel draws ~12mA when enabled permanently. Therefore
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* we only enable it for a very short time to check for changes every
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* tick, and only keep it enabled if there is activity. */
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#define WHEEL_TIMEOUT (HZ/4)
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#endif
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static void handle_scroll_wheel(int new_scroll, int was_hold)
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{
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int wheel_keycode = BUTTON_NONE;
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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 int 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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if ( prev_scroll == -1 ) {
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prev_scroll = new_scroll;
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}
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else if (direction != scroll_state[prev_scroll][new_scroll]) {
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direction = scroll_state[prev_scroll][new_scroll];
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count = 0;
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}
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else if (!was_hold) {
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backlight_on();
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reset_poweroff_timer();
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if (++count == 6) { /* reduce sensitivity */
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count = 0;
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/* 1st..3rd Gen wheel has inverse direction mapping
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* compared to Mini 1st Gen wheel. */
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switch (direction) {
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case 1:
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wheel_keycode = BUTTON_SCROLL_BACK;
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break;
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case -1:
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wheel_keycode = BUTTON_SCROLL_FWD;
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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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}
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}
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if (wheel_keycode != BUTTON_NONE && queue_empty(&button_queue))
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queue_post(&button_queue, wheel_keycode, 0);
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prev_scroll = new_scroll;
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}
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static int ipod_3g_button_read(void)
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{
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unsigned char source, state;
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static bool was_hold = false;
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int btn = BUTTON_NONE;
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#ifdef IPOD_3G
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/* The following delay was 250 in the ipodlinux source,
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* but 50 seems to work fine. 250 causes the wheel to stop
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* working when spinning it real fast. */
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udelay(50);
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#endif
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/* get source of interupts */
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source = GPIOA_INT_STAT;
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/* get current keypad status */
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state = GPIOA_INPUT_VAL;
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/* toggle interrupt level */
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GPIOA_INT_LEV = ~state;
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#ifdef IPOD_3G
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if (was_hold && source == 0x40 && state == 0xbf) {
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/* ack any active interrupts */
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GPIOA_INT_CLR = source;
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return BUTTON_NONE;
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}
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was_hold = false;
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if ((state & 0x20) == 0) {
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/* 3g hold switch is active low */
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was_hold = true;
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/* hold switch on 3g causes all outputs to go low */
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/* we shouldn't interpret these as key presses */
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GPIOA_INT_CLR = source;
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return BUTTON_NONE;
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}
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#elif defined IPOD_1G2G
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if (state & 0x20) {
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/* 1g/2g hold switch is active high */
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GPIOA_INT_CLR = source;
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return BUTTON_NONE;
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}
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#endif
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if ((state & 0x1) == 0) {
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btn |= BUTTON_RIGHT;
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}
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if ((state & 0x2) == 0) {
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btn |= BUTTON_SELECT;
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}
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if ((state & 0x4) == 0) {
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btn |= BUTTON_PLAY;
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}
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if ((state & 0x8) == 0) {
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btn |= BUTTON_LEFT;
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}
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if ((state & 0x10) == 0) {
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btn |= BUTTON_MENU;
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}
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if (source & 0xc0) {
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handle_scroll_wheel((state & 0xc0) >> 6, was_hold);
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}
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/* ack any active interrupts */
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GPIOA_INT_CLR = source;
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return btn;
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}
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void ipod_3g_button_int(void)
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{
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CPU_INT_DIS = GPIO_MASK;
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int_btn = ipod_3g_button_read();
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CPU_INT_EN = GPIO_MASK;
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}
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void button_init_device(void)
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{
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GPIOA_ENABLE = 0xff;
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GPIOA_OUTPUT_EN = 0;
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GPIOA_INT_LEV = ~GPIOA_INPUT_VAL;
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GPIOA_INT_CLR = GPIOA_INT_STAT;
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#ifdef IPOD_1G2G
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if ((IPOD_HW_REVISION >> 16) == 1)
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{ /* enable scroll wheel */
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GPIOB_ENABLE |= 0x01;
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GPIOB_OUTPUT_EN |= 0x01;
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GPIOB_OUTPUT_VAL |= 0x01;
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}
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#endif
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GPIOA_INT_EN = 0xff;
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CPU_INT_EN = GPIO_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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#ifdef IPOD_1G2G
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static int wheel_timeout = 0;
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static unsigned char last_wheel_value = 0;
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unsigned char wheel_value;
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if ((IPOD_HW_REVISION >> 16) == 1)
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{
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if (!hold_button && (wheel_timeout == 0))
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{
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GPIOB_OUTPUT_VAL |= 0x01; /* enable wheel */
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udelay(50); /* let the voltage settle */
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}
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wheel_value = GPIOA_INPUT_VAL >> 6;
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if (wheel_value != last_wheel_value)
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{
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last_wheel_value = wheel_value;
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wheel_timeout = WHEEL_TIMEOUT; /* keep wheel enabled */
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GPIOA_INT_EN = 0xff; /* enable wheel interrupts */
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}
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if (wheel_timeout)
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wheel_timeout--;
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else
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{
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GPIOA_INT_EN = 0x3f; /* disable wheel interrupts */
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GPIOB_OUTPUT_VAL &= ~0x01; /* disable wheel */
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}
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}
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#endif
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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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return int_btn;
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}
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bool button_hold(void)
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{
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#ifdef IPOD_1G2G
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return (GPIOA_INPUT_VAL & 0x20);
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#else
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return !(GPIOA_INPUT_VAL & 0x20);
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#endif
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}
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bool headphones_inserted(void)
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{
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#ifdef IPOD_1G2G
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if ((IPOD_HW_REVISION >> 16) == 2)
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{
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/* 2G uses GPIO B bit 0 */
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return (GPIOB_INPUT_VAL & 0x1)?true:false;
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}
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else
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{
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/* 1G has no headphone detection, so fake insertion */
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return (true);
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}
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#else
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/* 3G uses GPIO C bit 0 */
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return (GPIOC_INPUT_VAL & 0x1)?true:false;
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#endif
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}
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