button-sensor.c

/*
 * Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
 * to the MC1322x project (http://mc1322x.devl.org) and Contiki.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * This file is part of the Contiki OS.
 *
 * $Id: button-sensor.c,v 1.1 2010/06/09 14:46:30 maralvira Exp $
 */

#include "lib/sensors.h"
#include "dev/button-sensor.h"

#include "mc1322x.h"

#include <signal.h>

const struct sensors_sensor button_sensor;

static struct timer debouncetimer;
static int status(int type);

void kbi4_isr(void) {
        if(timer_expired(&debouncetimer)) {
                timer_set(&debouncetimer, CLOCK_SECOND / 4);
                sensors_changed(&button_sensor);
        }
        clear_kbi_evnt(4);
}

static int
value(int type)
{
        return GPIO->DATA.GPIO_26 || !timer_expired(&debouncetimer);
}

static int
configure(int type, int c)
{
        switch (type) {
        case SENSORS_ACTIVE:
                if (c) {
                        if(!status(SENSORS_ACTIVE)) {
                                timer_set(&debouncetimer, 0);
                                enable_irq_kbi(4);
                                kbi_edge(4);
                                enable_ext_wu(4);
                        }
                } else {
                        disable_irq_kbi(4);
                }
                return 1;
        }
        return 0;
}

static int
status(int type)
{
        switch (type) {
        case SENSORS_ACTIVE:
        case SENSORS_READY:
                return bit_is_set(*CRM_WU_CNTL, 20); /* check if kbi4 irq is enabled */
        }
        return 0;
}

SENSORS_SENSOR(button_sensor, BUTTON_SENSOR,
               value, configure, status);