/*
* Copyright (C) 2007-2012 Siemens AG
*
* Written by:
* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
*
* Based on the code from 'linux-zigbee.sourceforge.net' project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <net/netlink.h>
#include <linux/nl802154.h>
#include <net/mac802154.h>
#include <net/ieee802154_netdev.h>
#include <net/route.h>
#include <net/cfg802154.h>
#include "ieee802154_i.h"
static int
mac802154_netdev_register(struct wpan_phy *phy, struct net_device *dev)
{
struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
struct ieee802154_local *local;
int err;
local = wpan_phy_priv(phy);
sdata->dev = dev;
sdata->local = local;
dev->needed_headroom = local->hw.extra_tx_headroom;
SET_NETDEV_DEV(dev, &local->phy->dev);
err = register_netdev(dev);
if (err < 0)
return err;
rtnl_lock();
mutex_lock(&local->iflist_mtx);
list_add_tail_rcu(&sdata->list, &local->interfaces);
mutex_unlock(&local->iflist_mtx);
rtnl_unlock();
return 0;
}
static void
mac802154_del_iface(struct wpan_phy *phy, struct net_device *dev)
{
struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
ASSERT_RTNL();
BUG_ON(sdata->local->phy != phy);
mutex_lock(&sdata->local->iflist_mtx);
list_del_rcu(&sdata->list);
mutex_unlock(&sdata->local->iflist_mtx);
synchronize_rcu();
unregister_netdevice(sdata->dev);
}
static struct net_device *
mac802154_add_iface(struct wpan_phy *phy, const char *name, int type)
{
struct net_device *dev;
int err = -ENOMEM;
switch (type) {
case IEEE802154_DEV_MONITOR:
dev = alloc_netdev(sizeof(struct ieee802154_sub_if_data),
name, NET_NAME_UNKNOWN,
mac802154_monitor_setup);
break;
case IEEE802154_DEV_WPAN:
dev = alloc_netdev(sizeof(struct ieee802154_sub_if_data),
name, NET_NAME_UNKNOWN,
mac802154_wpan_setup);
break;
default:
dev = NULL;
err = -EINVAL;
break;
}
if (!dev)
goto err;
err = mac802154_netdev_register(phy, dev);
if (err)
goto err_free;
dev_hold(dev); /* we return an incremented device refcount */
return dev;
err_free:
free_netdev(dev);
err:
return ERR_PTR(err);
}
static void ieee802154_tasklet_handler(unsigned long data)
{
struct ieee802154_local *local = (struct ieee802154_local *)data;
struct sk_buff *skb;
while ((skb = skb_dequeue(&local->skb_queue))) {
switch (skb->pkt_type) {
case IEEE802154_RX_MSG:
/* Clear skb->pkt_type in order to not confuse kernel
* netstack.
*/
skb->pkt_type = 0;
ieee802154_rx(&local->hw, skb);
break;
default:
WARN(1, "mac802154: Packet is of unknown type %d\n",
skb->pkt_type);
kfree_skb(skb);
break;
}
}
}
struct ieee802154_hw *
ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
{
struct wpan_phy *phy;
struct ieee802154_local *local;
size_t priv_size;
if (!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed ||
!ops->start || !ops->stop || !ops->set_channel) {
pr_err("undefined IEEE802.15.4 device operations\n");
return NULL;
}
/* Ensure 32-byte alignment of our private data and hw private data.
* We use the wpan_phy priv data for both our ieee802154_local and for
* the driver's private data
*
* in memory it'll be like this:
*
* +-------------------------+
* | struct wpan_phy |
* +-------------------------+
* | struct ieee802154_local |
* +-------------------------+
* | driver's private data |
* +-------------------------+
*
* Due to ieee802154 layer isn't aware of driver and MAC structures,
* so lets align them here.
*/
priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
phy = wpan_phy_alloc(priv_size);
if (!phy) {
pr_err("failure to allocate master IEEE802.15.4 device\n");
return NULL;
}
local = wpan_phy_priv(phy);
local->phy = phy;
local->hw.phy = local->phy;
local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
local->ops = ops;
INIT_LIST_HEAD(&local->interfaces);
mutex_init(&local->iflist_mtx);
tasklet_init(&local->tasklet,
ieee802154_tasklet_handler,
(unsigned long)local);
skb_queue_head_init(&local->skb_queue);
return &local->hw;
}
EXPORT_SYMBOL(ieee802154_alloc_hw);
void ieee802154_free_hw(struct ieee802154_hw *hw)
{
struct ieee802154_local *local = hw_to_local(hw);
BUG_ON(!list_empty(&local->interfaces));
mutex_destroy(&local->iflist_mtx);
wpan_phy_free(local->phy);
}
EXPORT_SYMBOL(ieee802154_free_hw);
int ieee802154_register_hw(struct ieee802154_hw *hw)
{
struct ieee802154_local *local = hw_to_local(hw);
int rc = -ENOSYS;
local->workqueue =
create_singlethread_workqueue(wpan_phy_name(local->phy));
if (!local->workqueue) {
rc = -ENOMEM;
goto out;
}
wpan_phy_set_dev(local->phy, local->hw.parent);
local->phy->add_iface = mac802154_add_iface;
local->phy->del_iface = mac802154_del_iface;
rc = wpan_phy_register(local->phy);
if (rc < 0)
goto out_wq;
return 0;
out_wq:
destroy_workqueue(local->workqueue);
out:
return rc;
}
EXPORT_SYMBOL(ieee802154_register_hw);
void ieee802154_unregister_hw(struct ieee802154_hw *hw)
{
struct ieee802154_local *local = hw_to_local(hw);
struct ieee802154_sub_if_data *sdata, *next;
tasklet_kill(&local->tasklet);
flush_workqueue(local->workqueue);
destroy_workqueue(local->workqueue);
rtnl_lock();
list_for_each_entry_safe(sdata, next, &local->interfaces, list) {
mutex_lock(&sdata->local->iflist_mtx);
list_del(&sdata->list);
mutex_unlock(&sdata->local->iflist_mtx);
unregister_netdevice(sdata->dev);
}
rtnl_unlock();
wpan_phy_unregister(local->phy);
}
EXPORT_SYMBOL(ieee802154_unregister_hw);
MODULE_DESCRIPTION("IEEE 802.15.4 implementation");
MODULE_LICENSE("GPL v2");
