boards/arm/kinetis/freedom-k66f/src/k66_rtc.c

/****************************************************************************
 * boards/arm/kinetis/freedom-k66f/src/k66_rtc.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <syslog.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/timers/rtc.h>

#include "freedom-k66f.h"
#include "kinetis_alarm.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: k66_rtc_initialize
 *
 * Description:
 *   Called to initialize the RTC FREEDOM-K66F board.
 *
 ****************************************************************************/

int k66_rtc_initialize(void)
{
  int ret = -EIO;
  struct rtc_lowerhalf_s *lower;

  /* Instantiate the KINETIS lower-half RTC driver */

  lower = kinetis_rtc_lowerhalf();
  if (!lower)
    {
      syslog(LOG_ERR,
             "ERROR: Failed to instantiate the RTC lower-half driver\n");
    }
  else
    {
      /* Bind the lower half driver and register the combined RTC driver
       * as /dev/rtc0
       */

      ret = rtc_initialize(0, lower);

      if (ret < 0)
        {
          syslog(LOG_ERR,
                 "ERROR: Failed to bind/register the RTC driver: %d\n",
                 ret);
        }
    }

  return ret;
}