libipw_geo.c

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/******************************************************************************

  Copyright(c) 2005 Intel Corporation. All rights reserved.

  This program is free software; you can redistribute it and/or modify it
  under the terms of version 2 of the GNU General Public License 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, write to the Free Software Foundation, Inc., 59
  Temple Place - Suite 330, Boston, MA  02111-1307, USA.

  The full GNU General Public License is included in this distribution in the
  file called LICENSE.

  Contact Information:
  Intel Linux Wireless <[email protected]>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

******************************************************************************/
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/tcp.h>
#include <linux/types.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <asm/uaccess.h>

#include "libipw.h"

int libipw_is_valid_channel(struct libipw_device *ieee, u8 channel)
{
    int i;

    /* Driver needs to initialize the geography map before using
     * these helper functions */
    if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
        return 0;

    if (ieee->freq_band & LIBIPW_24GHZ_BAND)
        for (i = 0; i < ieee->geo.bg_channels; i++)
            /* NOTE: If G mode is currently supported but
             * this is a B only channel, we don't see it
             * as valid. */
            if ((ieee->geo.bg[i].channel == channel) &&
                !(ieee->geo.bg[i].flags & LIBIPW_CH_INVALID) &&
                (!(ieee->mode & IEEE_G) ||
                 !(ieee->geo.bg[i].flags & LIBIPW_CH_B_ONLY)))
                return LIBIPW_24GHZ_BAND;

    if (ieee->freq_band & LIBIPW_52GHZ_BAND)
        for (i = 0; i < ieee->geo.a_channels; i++)
            if ((ieee->geo.a[i].channel == channel) &&
                !(ieee->geo.a[i].flags & LIBIPW_CH_INVALID))
                return LIBIPW_52GHZ_BAND;

    return 0;
}

int libipw_channel_to_index(struct libipw_device *ieee, u8 channel)
{
    int i;

    /* Driver needs to initialize the geography map before using
     * these helper functions */
    if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
        return -1;

    if (ieee->freq_band & LIBIPW_24GHZ_BAND)
        for (i = 0; i < ieee->geo.bg_channels; i++)
            if (ieee->geo.bg[i].channel == channel)
                return i;

    if (ieee->freq_band & LIBIPW_52GHZ_BAND)
        for (i = 0; i < ieee->geo.a_channels; i++)
            if (ieee->geo.a[i].channel == channel)
                return i;

    return -1;
}

u32 libipw_channel_to_freq(struct libipw_device * ieee, u8 channel)
{
    const struct libipw_channel * ch;

    /* Driver needs to initialize the geography map before using
     * these helper functions */
    if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
        return 0;

    ch = libipw_get_channel(ieee, channel);
    if (!ch->channel)
        return 0;
    return ch->freq;
}

u8 libipw_freq_to_channel(struct libipw_device * ieee, u32 freq)
{
    int i;

    /* Driver needs to initialize the geography map before using
     * these helper functions */
    if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
        return 0;

    freq /= 100000;

    if (ieee->freq_band & LIBIPW_24GHZ_BAND)
        for (i = 0; i < ieee->geo.bg_channels; i++)
            if (ieee->geo.bg[i].freq == freq)
                return ieee->geo.bg[i].channel;

    if (ieee->freq_band & LIBIPW_52GHZ_BAND)
        for (i = 0; i < ieee->geo.a_channels; i++)
            if (ieee->geo.a[i].freq == freq)
                return ieee->geo.a[i].channel;

    return 0;
}

int libipw_set_geo(struct libipw_device *ieee,
              const struct libipw_geo *geo)
{
    memcpy(ieee->geo.name, geo->name, 3);
    ieee->geo.name[3] = '\0';
    ieee->geo.bg_channels = geo->bg_channels;
    ieee->geo.a_channels = geo->a_channels;
    memcpy(ieee->geo.bg, geo->bg, geo->bg_channels *
           sizeof(struct libipw_channel));
    memcpy(ieee->geo.a, geo->a, ieee->geo.a_channels *
           sizeof(struct libipw_channel));
    return 0;
}

const struct libipw_geo *libipw_get_geo(struct libipw_device *ieee)
{
    return &ieee->geo;
}

u8 libipw_get_channel_flags(struct libipw_device * ieee, u8 channel)
{
    int index = libipw_channel_to_index(ieee, channel);

    if (index == -1)
        return LIBIPW_CH_INVALID;

    if (channel <= LIBIPW_24GHZ_CHANNELS)
        return ieee->geo.bg[index].flags;

    return ieee->geo.a[index].flags;
}

static const struct libipw_channel bad_channel = {
    .channel = 0,
    .flags = LIBIPW_CH_INVALID,
    .max_power = 0,
};

const struct libipw_channel *libipw_get_channel(struct libipw_device
                              *ieee, u8 channel)
{
    int index = libipw_channel_to_index(ieee, channel);

    if (index == -1)
        return &bad_channel;

    if (channel <= LIBIPW_24GHZ_CHANNELS)
        return &ieee->geo.bg[index];

    return &ieee->geo.a[index];
}

EXPORT_SYMBOL(libipw_get_channel);
EXPORT_SYMBOL(libipw_get_channel_flags);
EXPORT_SYMBOL(libipw_is_valid_channel);
EXPORT_SYMBOL(libipw_freq_to_channel);
EXPORT_SYMBOL(libipw_channel_to_freq);
EXPORT_SYMBOL(libipw_channel_to_index);
EXPORT_SYMBOL(libipw_set_geo);
EXPORT_SYMBOL(libipw_get_geo);