nomac_ioctl.c

硬实时linux补丁rtai下的网络协议栈 最新

/***
 *
 *  rtmac/nomac/nomac_ioctl.c
 *
 *  RTmac - real-time networking media access control subsystem
 *  Copyright (C) 2002       Marc Kleine-Budde <[e-mail]>,
 *                2003, 2004 Jan Kiszka <[e-mail]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/module.h>
#include <asm/uaccess.h>

#include <nomac_chrdev.h>
#include <rtmac/nomac/nomac.h>


static int nomac_ioctl_attach(struct rtnet_device *rtdev)
{
    struct nomac_priv   *nomac;
    int                 ret;


    if (rtdev->mac_priv == NULL) {
        ret = rtmac_disc_attach(rtdev, &nomac_disc);
        if (ret < 0)
            return ret;
    }

    nomac = (struct nomac_priv *)rtdev->mac_priv->disc_priv;
    if (nomac->magic != NOMAC_MAGIC)
        return -ENOTTY;

    /* ... */

    return 0;
}



static int nomac_ioctl_detach(struct rtnet_device *rtdev)
{
    struct nomac_priv   *nomac;
    int                 ret;


    if (rtdev->mac_priv == NULL)
        return -ENOTTY;

    nomac = (struct nomac_priv *)rtdev->mac_priv->disc_priv;
    if (nomac->magic != NOMAC_MAGIC)
        return -ENOTTY;

    ret = rtmac_disc_detach(rtdev);

    /* ... */

    return ret;
}



int nomac_ioctl(struct rtnet_device *rtdev, unsigned int request,
                unsigned long arg)
{
    struct nomac_config cfg;
    int                 ret;


    ret = copy_from_user(&cfg, (void *)arg, sizeof(cfg));
    if (ret != 0)
        return -EFAULT;

    if (down_interruptible(&rtdev->nrt_lock))
        return -ERESTARTSYS;

    switch (request) {
        case NOMAC_IOC_ATTACH:
            ret = nomac_ioctl_attach(rtdev);
            break;

        case NOMAC_IOC_DETACH:
            ret = nomac_ioctl_detach(rtdev);
            break;

        default:
            ret = -ENOTTY;
    }

    up(&rtdev->nrt_lock);

    return ret;
}