sysfs.c

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/*
 * This file provides /sys/class/ieee80211/<wiphy name>/
 * and some default attributes.
 *
 * Copyright 2005-2006  Jiri Benc <[email protected]>
 * Copyright 2006   Johannes Berg <[email protected]>
 *
 * This file is GPLv2 as found in COPYING.
 */

#include <linux/device.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/nl80211.h>
#include <linux/rtnetlink.h>
#include <net/cfg80211.h>
#include "sysfs.h"
#include "core.h"

static inline struct cfg80211_registered_device *dev_to_rdev(
    struct device *dev)
{
    return container_of(dev, struct cfg80211_registered_device, wiphy.dev);
}

#define SHOW_FMT(name, fmt, member)                 \
static ssize_t name ## _show(struct device *dev,            \
                  struct device_attribute *attr,        \
                  char *buf)                \
{                                   \
    return sprintf(buf, fmt "\n", dev_to_rdev(dev)->member);    \
}

SHOW_FMT(index, "%d", wiphy_idx);
SHOW_FMT(macaddress, "%pM", wiphy.perm_addr);
SHOW_FMT(address_mask, "%pM", wiphy.addr_mask);

static ssize_t name_show(struct device *dev,
             struct device_attribute *attr,
             char *buf) {
    struct wiphy *wiphy = &dev_to_rdev(dev)->wiphy;
    return sprintf(buf, "%s\n", dev_name(&wiphy->dev));
}


static ssize_t addresses_show(struct device *dev,
                  struct device_attribute *attr,
                  char *buf)
{
    struct wiphy *wiphy = &dev_to_rdev(dev)->wiphy;
    char *start = buf;
    int i;

    if (!wiphy->addresses)
        return sprintf(buf, "%pM\n", wiphy->perm_addr);

    for (i = 0; i < wiphy->n_addresses; i++)
        buf += sprintf(buf, "%pM\n", &wiphy->addresses[i].addr);

    return buf - start;
}

static struct device_attribute ieee80211_dev_attrs[] = {
    __ATTR_RO(index),
    __ATTR_RO(macaddress),
    __ATTR_RO(address_mask),
    __ATTR_RO(addresses),
    __ATTR_RO(name),
    {}
};

static void wiphy_dev_release(struct device *dev)
{
    struct cfg80211_registered_device *rdev = dev_to_rdev(dev);

    cfg80211_dev_free(rdev);
}

#ifdef CONFIG_HOTPLUG
static int wiphy_uevent(struct device *dev, struct kobj_uevent_env *env)
{
    /* TODO, we probably need stuff here */
    return 0;
}
#endif

static int wiphy_suspend(struct device *dev, pm_message_t state)
{
    struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
    int ret = 0;

    rdev->suspend_at = get_seconds();

    if (rdev->ops->suspend) {
        rtnl_lock();
        if (rdev->wiphy.registered)
            ret = rdev->ops->suspend(&rdev->wiphy, rdev->wowlan);
        rtnl_unlock();
    }

    return ret;
}

static int wiphy_resume(struct device *dev)
{
    struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
    int ret = 0;

    /* Age scan results with time spent in suspend */
    spin_lock_bh(&rdev->bss_lock);
    cfg80211_bss_age(rdev, get_seconds() - rdev->suspend_at);
    spin_unlock_bh(&rdev->bss_lock);

    if (rdev->ops->resume) {
        rtnl_lock();
        if (rdev->wiphy.registered)
            ret = rdev->ops->resume(&rdev->wiphy);
        rtnl_unlock();
    }

    return ret;
}

static const void *wiphy_namespace(struct device *d)
{
    struct wiphy *wiphy = container_of(d, struct wiphy, dev);

    return wiphy_net(wiphy);
}

struct class ieee80211_class = {
    .name = "ieee80211",
    .owner = THIS_MODULE,
    .dev_release = wiphy_dev_release,
    .dev_attrs = ieee80211_dev_attrs,
#ifdef CONFIG_HOTPLUG
    .dev_uevent = wiphy_uevent,
#endif
    .suspend = wiphy_suspend,
    .resume = wiphy_resume,
    .ns_type = &net_ns_type_operations,
    .namespace = wiphy_namespace,
};

int wiphy_sysfs_init(void)
{
    return class_register(&ieee80211_class);
}

void wiphy_sysfs_exit(void)
{
    class_unregister(&ieee80211_class);
}