linux-imx

/*

 * This file implement the Wireless Extensions priv API.

 *

 * Authors :    Jean Tourrilhes - HPL - <jt@hpl.hp.com>

 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.

 * Copyright    2009 Johannes Berg <johannes@sipsolutions.net>

 *

 * (As all part of the Linux kernel, this file is GPL)

 */

#include <linux/slab.h>

#include <linux/wireless.h>

#include <linux/netdevice.h>

#include <net/iw_handler.h>

#include <net/wext.h>

​

int iw_handler_get_private(struct net_device *      dev,

               struct iw_request_info * info,

               union iwreq_data *       wrqu,

               char *           extra)

{

    /* Check if the driver has something to export */

    if ((dev->wireless_handlers->num_private_args == 0) ||

       (dev->wireless_handlers->private_args == NULL))

        return -EOPNOTSUPP;

​

    /* Check if there is enough buffer up there */

    if (wrqu->data.length < dev->wireless_handlers->num_private_args) {

        /* User space can't know in advance how large the buffer

         * needs to be. Give it a hint, so that we can support

         * any size buffer we want somewhat efficiently... */

        wrqu->data.length = dev->wireless_handlers->num_private_args;

        return -E2BIG;

    }

​

    /* Set the number of available ioctls. */

    wrqu->data.length = dev->wireless_handlers->num_private_args;

​

    /* Copy structure to the user buffer. */

    memcpy(extra, dev->wireless_handlers->private_args,

           sizeof(struct iw_priv_args) * wrqu->data.length);

​

    return 0;

}

​

/* Size (in bytes) of the various private data types */

static const char iw_priv_type_size[] = {

    0,              /* IW_PRIV_TYPE_NONE */

    1,              /* IW_PRIV_TYPE_BYTE */

    1,              /* IW_PRIV_TYPE_CHAR */

    0,              /* Not defined */

    sizeof(__u32),          /* IW_PRIV_TYPE_INT */

    sizeof(struct iw_freq),     /* IW_PRIV_TYPE_FLOAT */

    sizeof(struct sockaddr),    /* IW_PRIV_TYPE_ADDR */

    0,              /* Not defined */

};

​

static int get_priv_size(__u16 args)

{

    int num = args & IW_PRIV_SIZE_MASK;

    int type = (args & IW_PRIV_TYPE_MASK) >> 12;

​

    return num * iw_priv_type_size[type];

}