// SPDX-License-Identifier: GPL-2.0-only
/******************************************************************************

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


  Contact Information:
  Intel Linux Wireless <ilw@linux.intel.com>
  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 <linux/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;
}

void 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));
}

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);