rockbox/firmware/drivers/button.c

/***************************************************************************
 *             __________               __   ___.
 *   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)
 *
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * 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"

#ifdef HAVE_REMOTE_LCD
#include "lcd-remote.h"
#endif

#ifdef TARGET_TREE
#include "button-target.h"
#endif

struct event_queue button_queue;

static long lastbtn;   /* Last valid button status */
static long last_read; /* Last button status, for debouncing/filtering */
#ifdef HAVE_LCD_BITMAP
static bool flipped;  /* buttons can be flipped to match the LCD flip */
#endif
#ifdef CONFIG_BACKLIGHT
static bool filter_first_keypress;
#ifdef HAVE_REMOTE_LCD
static bool remote_filter_first_keypress;
#endif
#endif

/* how long until repeat kicks in, in ticks */
#define REPEAT_START      30

/* the speed repeat starts at, in ticks */
#define REPEAT_INTERVAL_START   16

/* speed repeat finishes at, in ticks */
#define REPEAT_INTERVAL_FINISH  5

/* the power-off button and number of repeated keys before shutting off */
#if (CONFIG_KEYPAD == IRIVER_IFP7XX_PAD)
#define POWEROFF_BUTTON BUTTON_PLAY
#define POWEROFF_COUNT 40
#elif !defined(TARGET_TREE)
#define POWEROFF_BUTTON BUTTON_OFF
#define POWEROFF_COUNT 10
#endif

static int button_read(void);

#if (CONFIG_KEYPAD == IRIVER_H100_PAD) || (CONFIG_KEYPAD == IRIVER_H300_PAD)
static bool remote_button_hold_only(void);
#endif

#ifdef HAVE_HEADPHONE_DETECTION
bool phones_present = false;
#endif

static void button_tick(void)
{
    static int count = 0;
    static int repeat_speed = REPEAT_INTERVAL_START;
    static int repeat_count = 0;
    static bool repeat = false;
    static bool post = false;
#ifdef CONFIG_BACKLIGHT
    static bool skip_release = false;
#ifdef HAVE_REMOTE_LCD
    static bool skip_remote_release = false;
#endif
#endif
    int diff;
    int btn;

#if (CONFIG_KEYPAD == PLAYER_PAD) || (CONFIG_KEYPAD == RECORDER_PAD)

    /* Post events for the remote control */
    btn = remote_control_rx();
    if(btn)
    {
        queue_post(&button_queue, btn, NULL);
    }
#endif

#ifdef HAVE_HEADPHONE_DETECTION
    if ( headphones_inserted() )
    {
        if (! phones_present )
        {
            queue_post(&button_queue, SYS_PHONE_PLUGGED, NULL);
            phones_present = true;
        }
    } else {
        if ( phones_present )
        {
            queue_post(&button_queue, SYS_PHONE_UNPLUGGED, NULL);
            phones_present = false;
        }
    }
#endif

    btn = button_read();

    /* Find out if a key has been released */
    diff = btn ^ lastbtn;
    if(diff && (btn & diff) == 0)
    {
#ifdef CONFIG_BACKLIGHT
#ifdef HAVE_REMOTE_LCD
        if(diff & BUTTON_REMOTE)
            if(!skip_remote_release)
                queue_post(&button_queue, BUTTON_REL | diff, NULL);
            else
                skip_remote_release = false;
        else
#endif
            if(!skip_release)
                queue_post(&button_queue, BUTTON_REL | diff, NULL);
            else
                skip_release = false;
#else
        queue_post(&button_queue, BUTTON_REL | diff, NULL);
#endif
    }
    else
    {
        if ( btn )
        {
            /* normal keypress */
            if ( btn != lastbtn )
            {
                post = true;
                repeat = false;
                repeat_speed = REPEAT_INTERVAL_START;
            }
            else /* repeat? */
            {
                if ( repeat )
                {
                    if (!post)
                        count--;
                    if (count == 0) {
                        post = true;
                        /* yes we have repeat */
                        if (repeat_speed > REPEAT_INTERVAL_FINISH)
                            repeat_speed--;
                        count = repeat_speed;

                        repeat_count++;

                        /* Send a SYS_POWEROFF event if we have a device
                           which doesn't shut down easily with the OFF
                           key */
#ifdef HAVE_SW_POWEROFF
                        if ((btn == POWEROFF_BUTTON
#ifdef BUTTON_RC_STOP
                                    || btn == BUTTON_RC_STOP
#elif defined(RC_POWEROFF_BUTTON)
                                    || btn == RC_POWEROFF_BUTTON
#endif
                                    ) &&
#if defined(CONFIG_CHARGING) && !defined(HAVE_POWEROFF_WHILE_CHARGING)
                                !charger_inserted() &&
#endif
                                repeat_count > POWEROFF_COUNT)
                        {
                            /* Tell the main thread that it's time to
                               power off */
                            sys_poweroff();

                            /* Safety net for players without hardware
                               poweroff */
                            if(repeat_count > POWEROFF_COUNT * 10)
                                power_off();
                        }
#endif
                    }
                }
                else
                {
                    if (count++ > REPEAT_START)
                    {
                        post = true;
                        repeat = true;
                        repeat_count = 0;
                        /* initial repeat */
                        count = REPEAT_INTERVAL_START;
                    }
                }
            }
            if ( post )
            {
                if (repeat)
                {
                    /* Only post repeat events if the queue is empty,
                     * to avoid afterscroll effects. */
                    if (queue_empty(&button_queue))
                    {
                        queue_post(&button_queue, BUTTON_REPEAT | btn, NULL);
#ifdef CONFIG_BACKLIGHT
#ifdef HAVE_REMOTE_LCD
                        skip_remote_release = false;
#endif
                        skip_release = false;
#endif
                        post = false;
                    }
                }
                else
                {
#ifdef CONFIG_BACKLIGHT
#ifdef HAVE_REMOTE_LCD
                    if (btn & BUTTON_REMOTE) {
                        if (!remote_filter_first_keypress || is_remote_backlight_on()
#if defined(IRIVER_H100_SERIES) || defined(IRIVER_H300_SERIES)
                           || (remote_type()==REMOTETYPE_H300_NONLCD)
#endif
                            )
                            queue_post(&button_queue, btn, NULL);
                        else
                            skip_remote_release = true;
                    }
                    else
#endif
                        if (!filter_first_keypress || is_backlight_on())
                            queue_post(&button_queue, btn, NULL);
                        else
                            skip_release = true;
#else /* no backlight, nothing to skip */
                    queue_post(&button_queue, btn, NULL);
#endif
                    post = false;
                }
#ifdef HAVE_REMOTE_LCD
                if(btn & BUTTON_REMOTE)
                    remote_backlight_on();
                else
#endif
                    backlight_on();

                reset_poweroff_timer();
            }
        }
        else
        {
            repeat = false;
            count = 0;
        }
    }
    lastbtn = btn & ~(BUTTON_REL | BUTTON_REPEAT);
}

long button_get(bool block)
{
    struct event ev;

    if ( block || !queue_empty(&button_queue) )
    {
        queue_wait(&button_queue, &ev);
        return ev.id;
    }
    return BUTTON_NONE;
}

long button_get_w_tmo(int ticks)
{
    struct event ev;
    queue_wait_w_tmo(&button_queue, &ev, ticks);
    return (ev.id != SYS_TIMEOUT)? ev.id: BUTTON_NONE;
}

void button_init(void)
{
    /* hardware inits */
#ifdef TARGET_TREE
    button_init_device();
    
#elif CONFIG_KEYPAD == IRIVER_H100_PAD
    /* Set GPIO33, GPIO37, GPIO38  and GPIO52 as general purpose inputs */
    GPIO1_FUNCTION |= 0x00100062;
    GPIO1_ENABLE &= ~0x00100060;
#elif CONFIG_KEYPAD == IRIVER_H300_PAD
    /* Set GPIO9 and GPIO15 as general purpose inputs */
    GPIO_ENABLE &= ~0x00008200;
    GPIO_FUNCTION |= 0x00008200;
    /* Set GPIO33, GPIO37, GPIO38  and GPIO52 as general purpose inputs */
    GPIO1_ENABLE &= ~0x00100060;
    GPIO1_FUNCTION |= 0x00100062;
#elif CONFIG_KEYPAD == RECORDER_PAD
    /* Set PB4 and PB8 as input pins */
    PBCR1 &= 0xfffc;  /* PB8MD = 00 */
    PBCR2 &= 0xfcff;  /* PB4MD = 00 */
    PBIOR &= ~0x0110; /* Inputs */
#elif CONFIG_KEYPAD == PLAYER_PAD
    /* set PA5 and PA11 as input pins */
    PACR1 &= 0xff3f;  /* PA11MD = 00 */
    PACR2 &= 0xfbff;  /* PA5MD = 0 */
    PAIOR &= ~0x0820; /* Inputs */
#elif CONFIG_KEYPAD == ONDIO_PAD
    /* nothing to initialize here */
#elif CONFIG_KEYPAD == GMINI100_PAD
    /* nothing to initialize here */
#endif /* CONFIG_KEYPAD */
    queue_init(&button_queue, true);
    button_read();
    lastbtn = button_read();
    tick_add_task(button_tick);
    reset_poweroff_timer();

#ifdef HAVE_LCD_BITMAP
    flipped = false;
#endif
#ifdef CONFIG_BACKLIGHT
    filter_first_keypress = false;
#ifdef HAVE_REMOTE_LCD
    remote_filter_first_keypress = false;
#endif    
#endif
}

#ifdef HAVE_LCD_BITMAP /* only bitmap displays can be flipped */
/*
 * helper function to swap LEFT/RIGHT, UP/DOWN (if present), and F1/F3 (Recorder)
 */
static int button_flip(int button)
{
    int newbutton;

    newbutton = button &
        ~(BUTTON_LEFT | BUTTON_RIGHT
#if defined(BUTTON_UP) && defined(BUTTON_DOWN)
        | BUTTON_UP | BUTTON_DOWN
#endif
#if defined(BUTTON_SCROLL_UP) && defined(BUTTON_SCROLL_DOWN)
        | BUTTON_SCROLL_UP | BUTTON_SCROLL_DOWN
#endif
#if CONFIG_KEYPAD == RECORDER_PAD
        | BUTTON_F1 | BUTTON_F3
#endif
        );

    if (button & BUTTON_LEFT)
        newbutton |= BUTTON_RIGHT;
    if (button & BUTTON_RIGHT)
        newbutton |= BUTTON_LEFT;
#if defined(BUTTON_UP) && defined(BUTTON_DOWN)
    if (button & BUTTON_UP)
        newbutton |= BUTTON_DOWN;
    if (button & BUTTON_DOWN)
        newbutton |= BUTTON_UP;
#endif
#if defined(BUTTON_SCROLL_UP) && defined(BUTTON_SCROLL_DOWN)
    if (button & BUTTON_SCROLL_UP)
        newbutton |= BUTTON_SCROLL_DOWN;
    if (button & BUTTON_SCROLL_DOWN)
        newbutton |= BUTTON_SCROLL_UP;
#endif
#if CONFIG_KEYPAD == RECORDER_PAD
    if (button & BUTTON_F1)
        newbutton |= BUTTON_F3;
    if (button & BUTTON_F3)
        newbutton |= BUTTON_F1;
#endif

    return newbutton;
}

/*
 * set the flip attribute
 * better only call this when the queue is empty
 */
void button_set_flip(bool flip)
{
    if (flip != flipped) /* not the current setting */
    {
        /* avoid race condition with the button_tick() */
        int oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
        lastbtn = button_flip(lastbtn);
        flipped = flip;
        set_irq_level(oldlevel);
    }
}
#endif /* HAVE_LCD_BITMAP */

#ifdef CONFIG_BACKLIGHT
void set_backlight_filter_keypress(bool value)
{
    filter_first_keypress = value;
}
#ifdef HAVE_REMOTE_LCD
void set_remote_backlight_filter_keypress(bool value)
{
    remote_filter_first_keypress = value;
}
#endif
#endif

/*
 Archos hardware button hookup
 =============================

 Recorder / Recorder FM/V2
 -------------------------
 F1, F2, F3, UP:           connected to AN4 through a resistor network
 DOWN, PLAY, LEFT, RIGHT:  likewise connected to AN5

 The voltage on AN4/ AN5 depends on which keys (or key combo) is pressed
 FM/V2 has PLAY and RIGHT switched compared to plain recorder

 ON:     PB8, low active (plain recorder) / AN3, low active (fm/v2)
 OFF:    PB4, low active (plain recorder) / AN2, high active (fm/v2)

 Player
 ------
 LEFT:   AN0
 MENU:   AN1
 RIGHT:  AN2
 PLAY:   AN3

 STOP:   PA11
 ON:     PA5

 All buttons are low active

 Ondio
 -----
 LEFT, RIGHT, UP, DOWN:    connected to AN4 through a resistor network

 The voltage on AN4 depends on which keys (or key combo) is pressed

 OPTION: AN2, high active (assigned as MENU)
 ON/OFF: AN3, low active (assigned as OFF)

*/

#if CONFIG_KEYPAD == RECORDER_PAD

#ifdef HAVE_FMADC
/* FM Recorder super-special levels */
#define LEVEL1        150
#define LEVEL2        385
#define LEVEL3        545
#define LEVEL4        700
#define ROW2_BUTTON1  BUTTON_PLAY
#define ROW2_BUTTON3  BUTTON_RIGHT

#else
/* plain bog standard Recorder levels */
#define LEVEL1        250
#define LEVEL2        500
#define LEVEL3        700
#define LEVEL4        900
#define ROW2_BUTTON1  BUTTON_RIGHT
#define ROW2_BUTTON3  BUTTON_PLAY
#endif /* HAVE_FMADC */

#elif CONFIG_KEYPAD == ONDIO_PAD
/* Ondio levels */
#define LEVEL1        165
#define LEVEL2        415
#define LEVEL3        585
#define LEVEL4        755

#endif /* CONFIG_KEYPAD */

/*
 * Get button pressed from hardware
 */
static int button_read(void)
{
    int btn = BUTTON_NONE;
    int retval;
#ifndef TARGET_TREE
    int data;
#endif

#ifdef TARGET_TREE
    btn = button_read_device();
    
#elif (CONFIG_KEYPAD == IRIVER_H100_PAD) || (CONFIG_KEYPAD == IRIVER_H300_PAD)
    static bool hold_button = false;
    static bool remote_hold_button = false;
    static int prev_data = 0xff;
    static int last_valid = 0xff;
    bool hold_button_old;
    bool remote_hold_button_old;

    /* normal buttons */
    hold_button_old = hold_button;
    hold_button = button_hold();

#ifndef BOOTLOADER
    if (hold_button != hold_button_old)
        backlight_hold_changed(hold_button);
#endif

    if (!hold_button)
    {
        data = adc_scan(ADC_BUTTONS);

        /* ADC debouncing: Only accept new reading if it's
         * stable (+/-1). Use latest stable value otherwise. */
        if ((unsigned)(data - prev_data + 1) <= 2)
            last_valid = data;
        prev_data = data;
        data = last_valid;

#if CONFIG_KEYPAD == IRIVER_H100_PAD
        if (data < 0xf0)
        {
            if (data < 0x80)
                if (data < 0x30)
                    if (data < 0x18)
                        btn = BUTTON_SELECT;
                    else
                        btn = BUTTON_UP;
                else
                    if (data < 0x50)
                        btn = BUTTON_LEFT;
                    else
                        btn = BUTTON_DOWN;
            else
                if (data < 0xb0)
                    if (data < 0xa0)
                        btn = BUTTON_RIGHT;
                    else
                        btn = BUTTON_OFF;
                else
                    if (data < 0xd0)
                        btn = BUTTON_MODE;
                    else
                        btn = BUTTON_REC;
        }
#else /* H300 */
        if (data < 0xba)
        {
            if (data < 0x54)
                if (data < 0x30)
                    if (data < 0x10)
                        btn = BUTTON_SELECT;
                    else
                        btn = BUTTON_UP;
                else
                    btn = BUTTON_LEFT;
            else
                if (data < 0x98)
                    if (data < 0x76)
                        btn = BUTTON_DOWN;
                    else
                        btn = BUTTON_RIGHT;
                else
                    btn = BUTTON_OFF;
        }
#endif
    }

    /* remote buttons */
    remote_hold_button_old = remote_hold_button;
    remote_hold_button = remote_button_hold_only();

#ifndef BOOTLOADER
    if (remote_hold_button != remote_hold_button_old)
        remote_backlight_hold_changed(remote_hold_button);
#endif

    if (!remote_hold_button)
    {
        data = adc_scan(ADC_REMOTE);
        switch (remote_type())
        {
            case REMOTETYPE_H100_LCD:
                if (data < 0xf5)
                {
                    if (data < 0x73)
                        if (data < 0x3f)
                            if (data < 0x25)
                                if(data < 0x0c)
                                    btn |= BUTTON_RC_STOP;
                                else
                                    btn |= BUTTON_RC_VOL_DOWN;
                            else
                                btn |= BUTTON_RC_MODE;
                        else
                            if (data < 0x5a)
                                btn |= BUTTON_RC_VOL_UP;
                            else
                                btn |= BUTTON_RC_BITRATE;
                    else
                        if (data < 0xa8)
                            if (data < 0x8c)
                                btn |= BUTTON_RC_REC;
                            else
                                btn |= BUTTON_RC_SOURCE;
                        else
                            if (data < 0xdf)
                                if(data < 0xc5)
                                    btn |= BUTTON_RC_FF;
                                else
                                    btn |= BUTTON_RC_MENU;
                            else
                                btn |= BUTTON_RC_REW;
                }
                break;
            case REMOTETYPE_H300_LCD:
                if (data < 0xf5)
                {
                    if (data < 0x73)
                        if (data < 0x42)
                            if (data < 0x27)
                                if(data < 0x0c)
                                    btn |= BUTTON_RC_VOL_DOWN;
                                else
                                    btn |= BUTTON_RC_FF;
                            else
                                btn |= BUTTON_RC_STOP;
                        else
                            if (data < 0x5b)
                                btn |= BUTTON_RC_MODE;
                            else
                                btn |= BUTTON_RC_REC;
                    else
                        if (data < 0xab)
                            if (data < 0x8e)
                                btn |= BUTTON_RC_ON;
                            else
                                btn |= BUTTON_RC_BITRATE;
                        else
                            if (data < 0xde)
                                if(data < 0xc5)
                                    btn |= BUTTON_RC_SOURCE;
                                else
                                    btn |= BUTTON_RC_VOL_UP;
                            else
                                btn |= BUTTON_RC_REW;
                }
                break;
            case REMOTETYPE_H300_NONLCD:
                if (data < 0xf1)
                {
                    if (data < 0x7d)
                        if (data < 0x25)
                            btn |= BUTTON_RC_FF;
                        else
                            btn |= BUTTON_RC_REW;
                    else
                        if (data < 0xd5)
                            btn |= BUTTON_RC_VOL_DOWN;
                        else
                            btn |= BUTTON_RC_VOL_UP;
                }
                break;
        }
    }

    /* special buttons */
#if CONFIG_KEYPAD == IRIVER_H300_PAD
    if (!hold_button)
    {
        data = GPIO_READ;
        if ((data & 0x0200) == 0)
            btn |= BUTTON_MODE;
        if ((data & 0x8000) == 0)
            btn |= BUTTON_REC;
    }
#endif

    data = GPIO1_READ;
    if (!hold_button && ((data & 0x20) == 0))
        btn |= BUTTON_ON;
    if (!remote_hold_button && ((data & 0x40) == 0))
        switch(remote_type())
        {
            case REMOTETYPE_H100_LCD:
            case REMOTETYPE_H300_NONLCD:
                btn |= BUTTON_RC_ON;
                break;
            case REMOTETYPE_H300_LCD:
                btn |= BUTTON_RC_MENU;
                break;
        }
   
#elif CONFIG_KEYPAD == IRIVER_IFP7XX_PAD
    static bool hold_button = false;
    bool hold_button_old;

    /* normal buttons */
    hold_button_old = hold_button;
    hold_button = button_hold();

    if (hold_button != hold_button_old)
        backlight_hold_changed(hold_button);

    if (!button_hold())
    {          
        data = adc_read(ADC_BUTTONS);
        if (data < 0x35c)
        {
            if (data < 0x151)
                if (data < 0xc7)
                    if (data < 0x41)
                        btn = BUTTON_LEFT;
                    else
                        btn = BUTTON_RIGHT;
                else
                    btn = BUTTON_SELECT;
            else
                if (data < 0x268)
                    if (data < 0x1d7)
                        btn = BUTTON_UP;
                    else
                        btn = BUTTON_DOWN;
                else
                    if (data < 0x2f9)
                        btn = BUTTON_EQ;
                    else
                        btn = BUTTON_MODE;
        }

        if (adc_read(ADC_BUTTON_PLAY) < 0x64)
            btn |= BUTTON_PLAY;
    }

#elif CONFIG_KEYPAD == RECORDER_PAD
#ifndef HAVE_FMADC
    static int off_button_count = 0;
#endif

    /* check F1..F3 and UP */
    data = adc_read(ADC_BUTTON_ROW1);
    if (data >= LEVEL1)
    {
        if (data >= LEVEL3)
            if (data >= LEVEL4)
                btn = BUTTON_F3;
            else
                btn = BUTTON_UP;
        else
            if (data >= LEVEL2)
                btn = BUTTON_F2;
            else
                btn = BUTTON_F1;
    }

    /* Some units have mushy keypads, so pressing UP also activates
       the Left/Right buttons. Let's combat that by skipping the AN5
       checks when UP is pressed. */
    if(!(btn & BUTTON_UP))
    {
        /* check DOWN, PLAY, LEFT, RIGHT */
        data = adc_read(ADC_BUTTON_ROW2);
        if (data >= LEVEL1)
        {
            if (data >= LEVEL3)
                if (data >= LEVEL4)
                    btn |= BUTTON_DOWN;
                else
                    btn |= ROW2_BUTTON3;
            else
                if (data >= LEVEL2)
                    btn |= BUTTON_LEFT;
                else
                    btn |= ROW2_BUTTON1;
        }
    }

#ifdef HAVE_FMADC
    if ( adc_read(ADC_BUTTON_ON) < 512 )
        btn |= BUTTON_ON;
    if ( adc_read(ADC_BUTTON_OFF) > 512 )
        btn |= BUTTON_OFF;
#else
    /* check port B pins for ON and OFF */
    data = PBDR;
    if ((data & 0x0100) == 0)
        btn |= BUTTON_ON;

    if ((data & 0x0010) == 0)
    {
        /* When the batteries are low, the low-battery shutdown logic causes
         * spurious OFF events due to voltage fluctuation on some units.
         * Only accept OFF when read several times in sequence. */
        if (++off_button_count > 3)
            btn |= BUTTON_OFF;
    }
    else
        off_button_count = 0;
#endif

#elif CONFIG_KEYPAD == PLAYER_PAD
    /* buttons are active low */
    if (adc_read(0) < 0x180)
        btn = BUTTON_LEFT;
    if (adc_read(1) < 0x180)
        btn |= BUTTON_MENU;
    if(adc_read(2) < 0x180)
        btn |= BUTTON_RIGHT;
    if(adc_read(3) < 0x180)
        btn |= BUTTON_PLAY;

    /* check port A pins for ON and STOP */
    data = PADR;
    if ( !(data & 0x0020) )
        btn |= BUTTON_ON;
    if ( !(data & 0x0800) )
        btn |= BUTTON_STOP;

#elif CONFIG_KEYPAD == ONDIO_PAD
    /* Check the 4 direction keys */
    data = adc_read(ADC_BUTTON_ROW1);
    if (data >= LEVEL1)
    {
        if (data >= LEVEL3)
            if (data >= LEVEL4)
                btn = BUTTON_LEFT;
            else
                btn = BUTTON_RIGHT;
        else
            if (data >= LEVEL2)
                btn = BUTTON_UP;
            else
                btn = BUTTON_DOWN;
    }

    if(adc_read(ADC_BUTTON_OPTION) > 0x200) /* active high */
        btn |= BUTTON_MENU;
    if(adc_read(ADC_BUTTON_ONOFF) < 0x120) /* active low */
        btn |= BUTTON_OFF;

#elif CONFIG_KEYPAD == GMINI100_PAD
    data = adc_read(7);
    if (data < 0x38a)
    {
        if (data < 0x1c5)
            if (data < 0xe3)
                btn = BUTTON_LEFT;
            else
                btn = BUTTON_DOWN;
        else
            if (data < 0x2a2)
                btn = BUTTON_RIGHT;
            else
                btn = BUTTON_UP;
    }

    data = adc_read(6);
    if (data < 0x355)
    {
        if (data < 0x288)
            if (data < 0x233)
                btn |= BUTTON_OFF;
            else
                btn |= BUTTON_PLAY;
        else
            btn |= BUTTON_MENU;
    }

    data = P7;
    if (data & 0x01)
        btn |= BUTTON_ON;

#endif /* CONFIG_KEYPAD */

#ifdef HAVE_LCD_BITMAP
    if (btn && flipped)
        btn = button_flip(btn); /* swap upside down */
#endif

    /* Filter the button status. It is only accepted if we get the same
       status twice in a row. */
    if (btn != last_read)
        retval = lastbtn;
    else
        retval = btn;
    last_read = btn;

    return retval;
}

#if (CONFIG_KEYPAD == IRIVER_H100_PAD) || (CONFIG_KEYPAD == IRIVER_H300_PAD)
bool button_hold(void)
{
    return (GPIO1_READ & 0x00000002)?true:false;
}

static bool remote_button_hold_only(void)
{        
    if(remote_type() == REMOTETYPE_H300_NONLCD)
        return adc_scan(ADC_REMOTE)<0x0d; /* hold should be 0x00 */
    else
        return (GPIO1_READ & 0x00100000)?true:false;
}

/* returns true only if there is remote present */
bool remote_button_hold(void)
{
    /* H300's NON-LCD remote doesn't set the "remote present" bit */
    if(remote_type() == REMOTETYPE_H300_NONLCD)
        return remote_button_hold_only();
    else
        return ((GPIO_READ & 0x40000000) == 0)?remote_button_hold_only():false;
}
#endif

#if CONFIG_KEYPAD == IRIVER_IFP7XX_PAD
bool button_hold(void)
{
    return (GPIO5_READ & 4) ? false : true;
}
#endif

int button_status(void)
{
    return lastbtn;
}

void button_clear_queue(void)
{
    queue_clear(&button_queue);
}