/*
 * Author: Jon Trulson <jtrulson@ics.com>
 *         Abhishek Malik <abhishek.malik@intel.com>
 * Copyright (c) 2016 Intel Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#include "a110x.h"

a110x_context a110x_init(int pin) {
    // make sure MRAA is initialized
    int mraa_rv;
    if ((mraa_rv = mraa_init()) != MRAA_SUCCESS)
    {
        printf("%s: mraa_init() failed (%d).\n", __FUNCTION__, mraa_rv);
        return NULL;
    }

    a110x_context dev =
      (a110x_context) malloc(sizeof(struct _a110x_context));

    if (!dev)
      {
        return NULL;
      }

    dev->gpio_pin = pin;
    dev->gpio = mraa_gpio_init(dev->gpio_pin);
    if (mraa_gpio_dir(dev->gpio, MRAA_GPIO_IN) != MRAA_SUCCESS){
        free(dev);
        return NULL;
    }
    dev->isr_installed = false;
    return dev;
}

void a110x_close(a110x_context dev){
    free(dev);
}

upm_result_t a110x_magnet_detected(a110x_context dev, bool* res){
    int val = mraa_gpio_read(dev->gpio);
    if (val == 0)
        *res = false;
    else
        *res = true;
    return UPM_SUCCESS;
}

upm_result_t a110x_install_isr(a110x_context dev,
                               mraa_gpio_edge_t edge_level,
                               void (*isr)(void *), void *arg){
    if (dev->isr_installed)
        a110x_uninstall_isr(dev);

    mraa_gpio_isr(dev->gpio, edge_level, isr, arg);
    dev->isr_installed = true;
    return UPM_SUCCESS;
}

upm_result_t a110x_uninstall_isr(a110x_context dev){
    mraa_gpio_isr_exit(dev->gpio);
    dev->isr_installed = false;
    return UPM_SUCCESS;
}