linux-imx

/*

 * UWB radio (channel) management.

 *

 * Copyright (C) 2008 Cambridge Silicon Radio Ltd.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License version

 * 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#include <linux/kernel.h>

#include <linux/uwb.h>

#include <linux/export.h>

​

#include "uwb-internal.h"

​

​

static int uwb_radio_select_channel(struct uwb_rc *rc)

{

    /*

     * Default to channel 9 (BG1, TFC1) unless the user has

     * selected a specific channel or there are no active PALs.

     */

    if (rc->active_pals == 0)

        return -1;

    if (rc->beaconing_forced)

        return rc->beaconing_forced;

    return 9;

}

​

​

/*

 * Notify all active PALs that the channel has changed.

 */

static void uwb_radio_channel_changed(struct uwb_rc *rc, int channel)

{

    struct uwb_pal *pal;

​

    list_for_each_entry(pal, &rc->pals, node) {

        if (pal->channel && channel != pal->channel) {

            pal->channel = channel;

            if (pal->channel_changed)

                pal->channel_changed(pal, pal->channel);

        }

    }

}

​

/*

 * Change to a new channel and notify any active PALs of the new

 * channel.

 *

 * When stopping the radio, PALs need to be notified first so they can

 * terminate any active reservations.

 */

static int uwb_radio_change_channel(struct uwb_rc *rc, int channel)

{