/*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#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/route.h>
#include <net/wpan-phy.h>
#include "mac802154.h"
int mac802154_slave_open(struct net_device *dev)
{
struct mac802154_sub_if_data *priv = netdev_priv(dev);
struct mac802154_priv *ipriv = priv->hw;
int res = 0;
if (ipriv->open_count++ == 0) {
res = ipriv->ops->start(&ipriv->hw);
WARN_ON(res);
if (res)
goto err;
}
if (ipriv->ops->ieee_addr) {
res = ipriv->ops->ieee_addr(&ipriv->hw, dev->dev_addr);
WARN_ON(res);
if (res)
goto err;
mac802154_dev_set_ieee_addr(dev);
}
netif_start_queue(dev);
return 0;
err:
priv->hw->open_count--;
return res;
}
int mac802154_slave_close(struct net_device *dev)
{
struct mac802154_sub_if_data *priv = netdev_priv(dev);
struct mac802154_priv *ipriv = priv->hw;
netif_stop_queue(dev);
if (!--ipriv->open_count)
ipriv->ops->stop(&ipriv->hw);
return 0;
}
static int
mac802154_netdev_register(struct wpan_phy *phy, struct net_device *dev)
{
struct mac802154_sub_if_data *priv;
struct mac802154_priv *ipriv;
int err;
ipriv = wpan_phy_priv(phy);
priv = netdev_priv(dev);
priv->dev = dev;
priv->hw = ipriv;
dev->needed_headroom = ipriv->hw.extra_tx_headroom;
SET_NETDEV_DEV(dev, &ipriv->phy->dev);
mutex_lock(&ipriv->slaves_mtx);
if (!ipriv->running) {
mutex_unlock(&ipriv->slaves_mtx);
return -ENODEV;
}
mutex_unlock(&ipriv->slaves_mtx);
err = register_netdev(dev);
if (err < 0)
return err;
rtnl_lock();
mutex_lock(&ipriv->slaves_mtx);
list_add_tail_rcu(&priv->list, &ipriv->slaves);
mutex_unlock(&ipriv->slaves_mtx);
rtnl_unlock();
return 0;
}
static void
mac802154_del_iface(struct wpan_phy *phy, struct net_device *dev)
{
struct mac802154_sub_if_data *sdata;
ASSERT_RTNL();
sdata = netdev_priv(dev);
BUG_ON(sdata->hw->phy != phy);
mutex_lock(&sdata->hw->slaves_mtx);
list_del_rcu(&sdata->list);
mutex_unlock(&sdata->hw->slaves_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 mac802154_sub_if_data),
name, mac802154_monitor_setup);
break;
case IEEE802154_DEV_WPAN:
dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
name, 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);
}
struct ieee802154_dev *
ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops)
{
struct wpan_phy *phy;
struct mac802154_priv *priv;
size_t priv_size;
if (!ops || !ops->xmit || !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 mac802154_priv and for
* the driver's private data
*
* in memory it'll be like this:
*
* +-----------------------+
* | struct wpan_phy |
* +-----------------------+
* | struct mac802154_priv |
* +-----------------------+
* | driver's private data |
* +-----------------------+
*
* Due to ieee802154 layer isn't aware of driver and MAC structures,
* so lets allign them here.
*/
priv_size = ALIGN(sizeof(*priv), 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;
}
priv = wpan_phy_priv(phy);
priv->hw.phy = priv->phy = phy;
priv->hw.priv = (char *)priv + ALIGN(sizeof(*priv), NETDEV_ALIGN);
priv->ops = ops;
INIT_LIST_HEAD(&priv->slaves);
mutex_init(&priv->slaves_mtx);
return &priv->hw;
}
EXPORT_SYMBOL(ieee802154_alloc_device);
void ieee802154_free_device(struct ieee802154_dev *hw)
{
struct mac802154_priv *priv = mac802154_to_priv(hw);
BUG_ON(!list_empty(&priv->slaves));
mutex_destroy(&priv->slaves_mtx);
wpan_phy_free(priv->phy);
}
EXPORT_SYMBOL(ieee802154_free_device);
int ieee802154_register_device(struct ieee802154_dev *dev)
{
struct mac802154_priv *priv = mac802154_to_priv(dev);
int rc = -ENOMEM;
priv->dev_workqueue =
create_singlethread_workqueue(wpan_phy_name(priv->phy));
if (!priv->dev_workqueue)
goto out;
wpan_phy_set_dev(priv->phy, priv->hw.parent);
priv->phy->add_iface = mac802154_add_iface;
priv->phy->del_iface = mac802154_del_iface;
rc = wpan_phy_register(priv->phy);
if (rc < 0)
goto out_wq;
rtnl_lock();
mutex_lock(&priv->slaves_mtx);
priv->running = MAC802154_DEVICE_RUN;
mutex_unlock(&priv->slaves_mtx);
rtnl_unlock();
return 0;
out_wq:
destroy_workqueue(priv->dev_workqueue);
out:
return rc;
}
EXPORT_SYMBOL(ieee802154_register_device);
void ieee802154_unregister_device(struct ieee802154_dev *dev)
{
struct mac802154_priv *priv = mac802154_to_priv(dev);
struct mac802154_sub_if_data *sdata, *next;
flush_workqueue(priv->dev_workqueue);
destroy_workqueue(priv->dev_workqueue);
rtnl_lock();
mutex_lock(&priv->slaves_mtx);
priv->running = MAC802154_DEVICE_STOPPED;
mutex_unlock(&priv->slaves_mtx);
list_for_each_entry_safe(sdata, next, &priv->slaves, list) {
mutex_lock(&sdata->hw->slaves_mtx);
list_del(&sdata->list);
mutex_unlock(&sdata->hw->slaves_mtx);
unregister_netdevice(sdata->dev);
}
rtnl_unlock();
wpan_phy_unregister(priv->phy);
}
EXPORT_SYMBOL(ieee802154_unregister_device);
MODULE_DESCRIPTION("IEEE 802.15.4 implementation");
MODULE_LICENSE("GPL v2");
