324 lines
7.0 KiB
C
324 lines
7.0 KiB
C
/*
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* Copyright (C) 2007, 2008, 2009 Siemens AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <net/cfg802154.h>
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#include <net/rtnetlink.h>
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#include "ieee802154.h"
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#include "nl802154.h"
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#include "sysfs.h"
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#include "core.h"
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/* name for sysfs, %d is appended */
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#define PHY_NAME "phy"
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/* RCU-protected (and RTNL for writers) */
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LIST_HEAD(cfg802154_rdev_list);
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int cfg802154_rdev_list_generation;
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static int wpan_phy_match(struct device *dev, const void *data)
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{
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return !strcmp(dev_name(dev), (const char *)data);
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}
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struct wpan_phy *wpan_phy_find(const char *str)
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{
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struct device *dev;
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if (WARN_ON(!str))
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return NULL;
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dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match);
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if (!dev)
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return NULL;
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return container_of(dev, struct wpan_phy, dev);
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}
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EXPORT_SYMBOL(wpan_phy_find);
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struct wpan_phy_iter_data {
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int (*fn)(struct wpan_phy *phy, void *data);
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void *data;
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};
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static int wpan_phy_iter(struct device *dev, void *_data)
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{
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struct wpan_phy_iter_data *wpid = _data;
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struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
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return wpid->fn(phy, wpid->data);
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}
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int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
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void *data)
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{
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struct wpan_phy_iter_data wpid = {
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.fn = fn,
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.data = data,
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};
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return class_for_each_device(&wpan_phy_class, NULL,
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&wpid, wpan_phy_iter);
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}
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EXPORT_SYMBOL(wpan_phy_for_each);
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struct cfg802154_registered_device *
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cfg802154_rdev_by_wpan_phy_idx(int wpan_phy_idx)
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{
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struct cfg802154_registered_device *result = NULL, *rdev;
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ASSERT_RTNL();
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list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
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if (rdev->wpan_phy_idx == wpan_phy_idx) {
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result = rdev;
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break;
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}
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}
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return result;
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}
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struct wpan_phy *
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wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size)
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{
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static atomic_t wpan_phy_counter = ATOMIC_INIT(0);
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struct cfg802154_registered_device *rdev;
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size_t alloc_size;
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alloc_size = sizeof(*rdev) + priv_size;
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rdev = kzalloc(alloc_size, GFP_KERNEL);
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if (!rdev)
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return NULL;
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rdev->ops = ops;
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rdev->wpan_phy_idx = atomic_inc_return(&wpan_phy_counter);
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if (unlikely(rdev->wpan_phy_idx < 0)) {
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/* ugh, wrapped! */
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atomic_dec(&wpan_phy_counter);
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kfree(rdev);
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return NULL;
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}
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/* atomic_inc_return makes it start at 1, make it start at 0 */
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rdev->wpan_phy_idx--;
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INIT_LIST_HEAD(&rdev->wpan_dev_list);
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device_initialize(&rdev->wpan_phy.dev);
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dev_set_name(&rdev->wpan_phy.dev, PHY_NAME "%d", rdev->wpan_phy_idx);
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rdev->wpan_phy.dev.class = &wpan_phy_class;
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rdev->wpan_phy.dev.platform_data = rdev;
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init_waitqueue_head(&rdev->dev_wait);
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return &rdev->wpan_phy;
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}
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EXPORT_SYMBOL(wpan_phy_new);
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int wpan_phy_register(struct wpan_phy *phy)
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{
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struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy);
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int ret;
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rtnl_lock();
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ret = device_add(&phy->dev);
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if (ret) {
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rtnl_unlock();
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return ret;
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}
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list_add_rcu(&rdev->list, &cfg802154_rdev_list);
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cfg802154_rdev_list_generation++;
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/* TODO phy registered lock */
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rtnl_unlock();
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/* TODO nl802154 phy notify */
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return 0;
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}
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EXPORT_SYMBOL(wpan_phy_register);
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void wpan_phy_unregister(struct wpan_phy *phy)
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{
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struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy);
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wait_event(rdev->dev_wait, ({
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int __count;
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rtnl_lock();
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__count = rdev->opencount;
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rtnl_unlock();
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__count == 0; }));
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rtnl_lock();
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/* TODO nl802154 phy notify */
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/* TODO phy registered lock */
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WARN_ON(!list_empty(&rdev->wpan_dev_list));
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/* First remove the hardware from everywhere, this makes
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* it impossible to find from userspace.
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*/
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list_del_rcu(&rdev->list);
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synchronize_rcu();
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cfg802154_rdev_list_generation++;
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device_del(&phy->dev);
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rtnl_unlock();
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}
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EXPORT_SYMBOL(wpan_phy_unregister);
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void wpan_phy_free(struct wpan_phy *phy)
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{
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put_device(&phy->dev);
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}
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EXPORT_SYMBOL(wpan_phy_free);
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void cfg802154_dev_free(struct cfg802154_registered_device *rdev)
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{
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kfree(rdev);
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}
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static void
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cfg802154_update_iface_num(struct cfg802154_registered_device *rdev,
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int iftype, int num)
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{
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ASSERT_RTNL();
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rdev->num_running_ifaces += num;
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}
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static int cfg802154_netdev_notifier_call(struct notifier_block *nb,
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unsigned long state, void *ptr)
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{
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struct net_device *dev = netdev_notifier_info_to_dev(ptr);
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struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
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struct cfg802154_registered_device *rdev;
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if (!wpan_dev)
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return NOTIFY_DONE;
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rdev = wpan_phy_to_rdev(wpan_dev->wpan_phy);
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/* TODO WARN_ON unspec type */
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switch (state) {
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/* TODO NETDEV_DEVTYPE */
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case NETDEV_REGISTER:
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dev->features |= NETIF_F_NETNS_LOCAL;
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wpan_dev->identifier = ++rdev->wpan_dev_id;
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list_add_rcu(&wpan_dev->list, &rdev->wpan_dev_list);
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rdev->devlist_generation++;
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wpan_dev->netdev = dev;
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break;
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case NETDEV_DOWN:
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cfg802154_update_iface_num(rdev, wpan_dev->iftype, -1);
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rdev->opencount--;
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wake_up(&rdev->dev_wait);
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break;
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case NETDEV_UP:
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cfg802154_update_iface_num(rdev, wpan_dev->iftype, 1);
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rdev->opencount++;
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break;
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case NETDEV_UNREGISTER:
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/* It is possible to get NETDEV_UNREGISTER
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* multiple times. To detect that, check
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* that the interface is still on the list
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* of registered interfaces, and only then
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* remove and clean it up.
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*/
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if (!list_empty(&wpan_dev->list)) {
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list_del_rcu(&wpan_dev->list);
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rdev->devlist_generation++;
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}
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/* synchronize (so that we won't find this netdev
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* from other code any more) and then clear the list
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* head so that the above code can safely check for
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* !list_empty() to avoid double-cleanup.
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*/
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synchronize_rcu();
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INIT_LIST_HEAD(&wpan_dev->list);
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break;
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default:
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return NOTIFY_DONE;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block cfg802154_netdev_notifier = {
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.notifier_call = cfg802154_netdev_notifier_call,
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};
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static int __init wpan_phy_class_init(void)
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{
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int rc;
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rc = wpan_phy_sysfs_init();
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if (rc)
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goto err;
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rc = register_netdevice_notifier(&cfg802154_netdev_notifier);
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if (rc)
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goto err_nl;
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rc = ieee802154_nl_init();
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if (rc)
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goto err_notifier;
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rc = nl802154_init();
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if (rc)
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goto err_ieee802154_nl;
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return 0;
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err_ieee802154_nl:
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ieee802154_nl_exit();
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err_notifier:
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unregister_netdevice_notifier(&cfg802154_netdev_notifier);
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err_nl:
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wpan_phy_sysfs_exit();
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err:
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return rc;
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}
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subsys_initcall(wpan_phy_class_init);
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static void __exit wpan_phy_class_exit(void)
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{
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nl802154_exit();
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ieee802154_nl_exit();
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unregister_netdevice_notifier(&cfg802154_netdev_notifier);
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wpan_phy_sysfs_exit();
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}
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module_exit(wpan_phy_class_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
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MODULE_AUTHOR("Dmitry Eremin-Solenikov");
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