sysfs.c

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/*

  Broadcom B43legacy 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 "sysfs.h"
#include "b43legacy.h"
#include "main.h"
#include "phy.h"
#include "radio.h"

#include <linux/capability.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 int get_boolean(const char *buf, size_t count)
{
    if (count != 0) {
        if (buf[0] == '1')
            return 1;
        if (buf[0] == '0')
            return 0;
        if (count >= 4 && memcmp(buf, "true", 4) == 0)
            return 1;
        if (count >= 5 && memcmp(buf, "false", 5) == 0)
            return 0;
        if (count >= 3 && memcmp(buf, "yes", 3) == 0)
            return 1;
        if (count >= 2 && memcmp(buf, "no", 2) == 0)
            return 0;
        if (count >= 2 && memcmp(buf, "on", 2) == 0)
            return 1;
        if (count >= 3 && memcmp(buf, "off", 3) == 0)
            return 0;
    }
    return -EINVAL;
}

static ssize_t b43legacy_attr_interfmode_show(struct device *dev,
                          struct device_attribute *attr,
                          char *buf)
{
    struct b43legacy_wldev *wldev = dev_to_b43legacy_wldev(dev);
    ssize_t count = 0;

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

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

    switch (wldev->phy.interfmode) {
    case B43legacy_INTERFMODE_NONE:
        count = snprintf(buf, PAGE_SIZE, "0 (No Interference"
                 " Mitigation)\n");
        break;
    case B43legacy_INTERFMODE_NONWLAN:
        count = snprintf(buf, PAGE_SIZE, "1 (Non-WLAN Interference"
                 " Mitigation)\n");
        break;
    case B43legacy_INTERFMODE_MANUALWLAN:
        count = snprintf(buf, PAGE_SIZE, "2 (WLAN Interference"
                 " Mitigation)\n");
        break;
    default:
        B43legacy_WARN_ON(1);
    }

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

    return count;
}

static ssize_t b43legacy_attr_interfmode_store(struct device *dev,
                           struct device_attribute *attr,
                           const char *buf, size_t count)
{
    struct b43legacy_wldev *wldev = dev_to_b43legacy_wldev(dev);
    unsigned long flags;
    int err;
    int mode;

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

    mode = get_integer(buf, count);
    switch (mode) {
    case 0:
        mode = B43legacy_INTERFMODE_NONE;
        break;
    case 1:
        mode = B43legacy_INTERFMODE_NONWLAN;
        break;
    case 2:
        mode = B43legacy_INTERFMODE_MANUALWLAN;
        break;
    case 3:
        mode = B43legacy_INTERFMODE_AUTOWLAN;
        break;
    default:
        return -EINVAL;
    }

    mutex_lock(&wldev->wl->mutex);
    spin_lock_irqsave(&wldev->wl->irq_lock, flags);

    err = b43legacy_radio_set_interference_mitigation(wldev, mode);
    if (err)
        b43legacyerr(wldev->wl, "Interference Mitigation not "
               "supported by device\n");
    mmiowb();
    spin_unlock_irqrestore(&wldev->wl->irq_lock, flags);
    mutex_unlock(&wldev->wl->mutex);

    return err ? err : count;
}

static DEVICE_ATTR(interference, 0644,
           b43legacy_attr_interfmode_show,
           b43legacy_attr_interfmode_store);

static ssize_t b43legacy_attr_preamble_show(struct device *dev,
                        struct device_attribute *attr,
                        char *buf)
{
    struct b43legacy_wldev *wldev = dev_to_b43legacy_wldev(dev);
    ssize_t count;

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

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

    if (wldev->short_preamble)
        count = snprintf(buf, PAGE_SIZE, "1 (Short Preamble"
                 " enabled)\n");
    else
        count = snprintf(buf, PAGE_SIZE, "0 (Short Preamble"
                 " disabled)\n");

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

    return count;
}

static ssize_t b43legacy_attr_preamble_store(struct device *dev,
                         struct device_attribute *attr,
                         const char *buf, size_t count)
{
    struct b43legacy_wldev *wldev = dev_to_b43legacy_wldev(dev);
    unsigned long flags;
    int value;

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

    value = get_boolean(buf, count);
    if (value < 0)
        return value;
    mutex_lock(&wldev->wl->mutex);
    spin_lock_irqsave(&wldev->wl->irq_lock, flags);

    wldev->short_preamble = !!value;

    spin_unlock_irqrestore(&wldev->wl->irq_lock, flags);
    mutex_unlock(&wldev->wl->mutex);

    return count;
}

static DEVICE_ATTR(shortpreamble, 0644,
           b43legacy_attr_preamble_show,
           b43legacy_attr_preamble_store);

int b43legacy_sysfs_register(struct b43legacy_wldev *wldev)
{
    struct device *dev = wldev->dev->dev;
    int err;

    B43legacy_WARN_ON(b43legacy_status(wldev) !=
              B43legacy_STAT_INITIALIZED);

    err = device_create_file(dev, &dev_attr_interference);
    if (err)
        goto out;
    err = device_create_file(dev, &dev_attr_shortpreamble);
    if (err)
        goto err_remove_interfmode;

out:
    return err;
err_remove_interfmode:
    device_remove_file(dev, &dev_attr_interference);
    goto out;
}

void b43legacy_sysfs_unregister(struct b43legacy_wldev *wldev)
{
    struct device *dev = wldev->dev->dev;

    device_remove_file(dev, &dev_attr_shortpreamble);
    device_remove_file(dev, &dev_attr_interference);
}