sysfs.c

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/*

  Broadcom B43 wireless driver

  SYSFS support routines

  Copyright (c) 2006 Michael Buesch <[email protected]>

  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; see the file COPYING.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  Boston, MA 02110-1301, USA.

*/

#include <linux/capability.h>
#include <linux/io.h>

#include "b43.h"
#include "sysfs.h"
#include "main.h"
#include "phy_common.h"

#define GENERIC_FILESIZE    64

static int get_integer(const char *buf, size_t count)
{
    char tmp[10 + 1] = { 0 };
    int ret = -EINVAL;

    if (count == 0)
        goto out;
    count = min(count, (size_t) 10);
    memcpy(tmp, buf, count);
    ret = simple_strtol(tmp, NULL, 10);
      out:
    return ret;
}

static ssize_t b43_attr_interfmode_show(struct device *dev,
                    struct device_attribute *attr,
                    char *buf)
{
    struct b43_wldev *wldev = dev_to_b43_wldev(dev);
    ssize_t count = 0;

    if (!capable(CAP_NET_ADMIN))
        return -EPERM;

    mutex_lock(&wldev->wl->mutex);

    if (wldev->phy.type != B43_PHYTYPE_G) {
        mutex_unlock(&wldev->wl->mutex);
        return -ENOSYS;
    }

    switch (wldev->phy.g->interfmode) {
    case B43_INTERFMODE_NONE:
        count =
            snprintf(buf, PAGE_SIZE,
                 "0 (No Interference Mitigation)\n");
        break;
    case B43_INTERFMODE_NONWLAN:
        count =
            snprintf(buf, PAGE_SIZE,
                 "1 (Non-WLAN Interference Mitigation)\n");
        break;
    case B43_INTERFMODE_MANUALWLAN:
        count =
            snprintf(buf, PAGE_SIZE,
                 "2 (WLAN Interference Mitigation)\n");
        break;
    default:
        B43_WARN_ON(1);
    }

    mutex_unlock(&wldev->wl->mutex);

    return count;
}

static ssize_t b43_attr_interfmode_store(struct device *dev,
                     struct device_attribute *attr,
                     const char *buf, size_t count)
{
    struct b43_wldev *wldev = dev_to_b43_wldev(dev);
    int err;
    int mode;

    if (!capable(CAP_NET_ADMIN))
        return -EPERM;

    mode = get_integer(buf, count);
    switch (mode) {
    case 0:
        mode = B43_INTERFMODE_NONE;
        break;
    case 1:
        mode = B43_INTERFMODE_NONWLAN;
        break;
    case 2:
        mode = B43_INTERFMODE_MANUALWLAN;
        break;
    case 3:
        mode = B43_INTERFMODE_AUTOWLAN;
        break;
    default:
        return -EINVAL;
    }

    mutex_lock(&wldev->wl->mutex);

    if (wldev->phy.ops->interf_mitigation) {
        err = wldev->phy.ops->interf_mitigation(wldev, mode);
        if (err) {
            b43err(wldev->wl, "Interference Mitigation not "
                   "supported by device\n");
        }
    } else
        err = -ENOSYS;

    mmiowb();
    mutex_unlock(&wldev->wl->mutex);

    return err ? err : count;
}

static DEVICE_ATTR(interference, 0644,
           b43_attr_interfmode_show, b43_attr_interfmode_store);

int b43_sysfs_register(struct b43_wldev *wldev)
{
    struct device *dev = wldev->dev->dev;

    B43_WARN_ON(b43_status(wldev) != B43_STAT_INITIALIZED);

    return device_create_file(dev, &dev_attr_interference);
}

void b43_sysfs_unregister(struct b43_wldev *wldev)
{
    struct device *dev = wldev->dev->dev;

    device_remove_file(dev, &dev_attr_interference);
}