nuttx/wireless/ieee802154/mac802154_scan.c

/****************************************************************************
 * wireless/ieee802154/mac80215_scan.c
 *
 *   Copyright (C) 2016 Sebastien Lorquet. All rights reserved.
 *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
 *   Copyright (C) 2017 Verge Inc. All rights reserved.
 *
 *   Author: Sebastien Lorquet <sebastien@lorquet.fr>
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *   Author: Anthony Merlino <anthony@vergeaero.com>
 *
 * 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 NuttX 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 COPYRIGHT HOLDERS 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
 * COPYRIGHT OWNER 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.
 *
 ****************************************************************************/

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

#include <nuttx/config.h>

#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <string.h>

#include "mac802154.h"

#include <nuttx/wireless/ieee802154/ieee802154_mac.h>

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

/****************************************************************************
 * Name: mac802154_req_scan
 *
 * Description:
 *   The MLME-SCAN.request primitive is used to initiate a channel scan over a
 *   given list of channels. A device can use a channel scan to measure the
 *   energy on the channel, search for the coordinator with which it associated,
 *   or search for all coordinators transmitting beacon frames within the POS of
 *   the scanning device. Scan results are returned
 *   via MULTIPLE calls to the struct mac802154_maccb_s->conf_scan callback.
 *   This is a difference with the official 802.15.4 specification, implemented
 *   here to save memory.
 *
 ****************************************************************************/

int mac802154_req_scan(MACHANDLE mac, FAR struct ieee802154_scan_req_s *req)
{
  FAR struct ieee802154_privmac_s *priv =
    (FAR struct ieee802154_privmac_s *)mac;
  int ret;

  if (req->duration > 15)
    {
      ret = -EINVAL;
      goto errout;
    }

  /* Need to get access to the ops semaphore since operations are serial. This
   * must be done before locking the MAC so that we don't hold the MAC
   */

  ret = mac802154_takesem(&priv->opsem, true);
  if (ret < 0)
    {
      ret = -EINVAL;
      goto errout;
    }
  
  ret = mac802154_takesem(&priv->exclsem, true);
  if (ret < 0)
    {
      ret = -EINVAL;
      goto errout;
    }


  switch (req->type)
    {
      case IEEE802154_SCANTYPE_PASSIVE:
        {

        }
        break;
      case IEEE802154_SCANTYPE_ACTIVE:
        {
          ret = -ENOTTY;
          goto errout_with_sem;
        }
        break;
      case IEEE802154_SCANTYPE_ED:
        {
          ret = -ENOTTY;
          goto errout_with_sem;
        }
        break;
      case IEEE802154_SCANTYPE_ORPHAN:
        {
          ret = -ENOTTY;
          goto errout_with_sem;
        }
        break;
      default:
        {
          ret = -EINVAL;
          goto errout_with_sem;
        }
        break;
    }

return OK;

errout_with_sem;
  mac802154_givesem(&priv->opsem);
errout:
  return ret;
}