blob: 6f630d4990fa9053001e79777a3c5796de08ee8c [file] [log] [blame]
/*
* 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"
int mac802154_slave_open(struct net_device *dev)
{
struct ieee802154_sub_if_data *sdata = netdev_priv(dev);
struct ieee802154_sub_if_data *subif;
struct ieee802154_local *local = sdata->hw;
int res = 0;
ASSERT_RTNL();
if (sdata->type == IEEE802154_DEV_WPAN) {
mutex_lock(&sdata->hw->slaves_mtx);
list_for_each_entry(subif, &sdata->hw->slaves, list) {
if (subif != sdata && subif->type == sdata->type &&
subif->running) {
mutex_unlock(&sdata->hw->slaves_mtx);
return -EBUSY;
}
}
mutex_unlock(&sdata->hw->slaves_mtx);
}
mutex_lock(&sdata->hw->slaves_mtx);
sdata->running = true;
mutex_unlock(&sdata->hw->slaves_mtx);
if (local->open_count++ == 0) {
res = local->ops->start(&local->hw);
WARN_ON(res);
if (res)
goto err;
}
if (local->ops->ieee_addr) {
__le64 addr = ieee802154_devaddr_from_raw(dev->dev_addr);
res = local->ops->ieee_addr(&local->hw, addr);
WARN_ON(res);
if (res)
goto err;
mac802154_dev_set_ieee_addr(dev);
}
netif_start_queue(dev);
return 0;
err:
sdata->hw->open_count--;
return res;
}
int mac802154_slave_close(struct net_device *dev)
{
struct ieee802154_sub_if_data *sdata = netdev_priv(dev);
struct ieee802154_local *local = sdata->hw;
ASSERT_RTNL();
netif_stop_queue(dev);
mutex_lock(&sdata->hw->slaves_mtx);
sdata->running = false;
mutex_unlock(&sdata->hw->slaves_mtx);
if (!--local->open_count)
local->ops->stop(&local->hw);
return 0;
}
static int
mac802154_netdev_register(struct wpan_phy *phy, struct net_device *dev)
{
struct ieee802154_sub_if_data *sdata;
struct ieee802154_local *local;
int err;
local = wpan_phy_priv(phy);
sdata = netdev_priv(dev);
sdata->dev = dev;
sdata->hw = local;
dev->needed_headroom = local->hw.extra_tx_headroom;
SET_NETDEV_DEV(dev, &local->phy->dev);
mutex_lock(&local->slaves_mtx);
if (!local->running) {
mutex_unlock(&local->slaves_mtx);
return -ENODEV;
}
mutex_unlock(&local->slaves_mtx);
err = register_netdev(dev);
if (err < 0)
return err;
rtnl_lock();
mutex_lock(&local->slaves_mtx);
list_add_tail_rcu(&sdata->list, &local->slaves);
mutex_unlock(&local->slaves_mtx);
rtnl_unlock();
return 0;
}
static void
mac802154_del_iface(struct wpan_phy *phy, struct net_device *dev)
{
struct ieee802154_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 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 int mac802154_set_txpower(struct wpan_phy *phy, int db)
{
struct ieee802154_local *local = wpan_phy_priv(phy);
return local->ops->set_txpower(&local->hw, db);
}
static int mac802154_set_lbt(struct wpan_phy *phy, bool on)
{
struct ieee802154_local *local = wpan_phy_priv(phy);
return local->ops->set_lbt(&local->hw, on);
}
static int mac802154_set_cca_mode(struct wpan_phy *phy, u8 mode)
{
struct ieee802154_local *local = wpan_phy_priv(phy);
return local->ops->set_cca_mode(&local->hw, mode);
}
static int mac802154_set_cca_ed_level(struct wpan_phy *phy, s32 level)
{
struct ieee802154_local *local = wpan_phy_priv(phy);
return local->ops->set_cca_ed_level(&local->hw, level);
}
static int mac802154_set_csma_params(struct wpan_phy *phy, u8 min_be,
u8 max_be, u8 retries)
{
struct ieee802154_local *local = wpan_phy_priv(phy);
return local->ops->set_csma_params(&local->hw, min_be, max_be, retries);
}
static int mac802154_set_frame_retries(struct wpan_phy *phy, s8 retries)
{
struct ieee802154_local *local = wpan_phy_priv(phy);
return local->ops->set_frame_retries(&local->hw, retries);
}
struct ieee802154_hw *
ieee802154_alloc_hw(size_t priv_data_len, struct ieee802154_ops *ops)
{
struct wpan_phy *phy;
struct ieee802154_local *local;
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 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->slaves);
mutex_init(&local->slaves_mtx);
return &local->hw;
}
EXPORT_SYMBOL(ieee802154_alloc_hw);
void ieee802154_free_hw(struct ieee802154_hw *hw)
{
struct ieee802154_local *local = mac802154_to_priv(hw);
BUG_ON(!list_empty(&local->slaves));
mutex_destroy(&local->slaves_mtx);
wpan_phy_free(local->phy);
}
EXPORT_SYMBOL(ieee802154_free_hw);
int ieee802154_register_hw(struct ieee802154_hw *hw)
{
struct ieee802154_local *local = mac802154_to_priv(hw);
int rc = -ENOSYS;
if (hw->flags & IEEE802154_HW_TXPOWER) {
if (!local->ops->set_txpower)
goto out;
local->phy->set_txpower = mac802154_set_txpower;
}
if (hw->flags & IEEE802154_HW_LBT) {
if (!local->ops->set_lbt)
goto out;
local->phy->set_lbt = mac802154_set_lbt;
}
if (hw->flags & IEEE802154_HW_CCA_MODE) {
if (!local->ops->set_cca_mode)
goto out;
local->phy->set_cca_mode = mac802154_set_cca_mode;
}
if (hw->flags & IEEE802154_HW_CCA_ED_LEVEL) {
if (!local->ops->set_cca_ed_level)
goto out;
local->phy->set_cca_ed_level = mac802154_set_cca_ed_level;
}
if (hw->flags & IEEE802154_HW_CSMA_PARAMS) {
if (!local->ops->set_csma_params)
goto out;
local->phy->set_csma_params = mac802154_set_csma_params;
}
if (hw->flags & IEEE802154_HW_FRAME_RETRIES) {
if (!local->ops->set_frame_retries)
goto out;
local->phy->set_frame_retries = mac802154_set_frame_retries;
}
local->dev_workqueue =
create_singlethread_workqueue(wpan_phy_name(local->phy));
if (!local->dev_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;
rtnl_lock();
mutex_lock(&local->slaves_mtx);
local->running = MAC802154_DEVICE_RUN;
mutex_unlock(&local->slaves_mtx);
rtnl_unlock();
return 0;
out_wq:
destroy_workqueue(local->dev_workqueue);
out:
return rc;
}
EXPORT_SYMBOL(ieee802154_register_hw);
void ieee802154_unregister_hw(struct ieee802154_hw *hw)
{
struct ieee802154_local *local = mac802154_to_priv(hw);
struct ieee802154_sub_if_data *sdata, *next;
flush_workqueue(local->dev_workqueue);
destroy_workqueue(local->dev_workqueue);
rtnl_lock();
mutex_lock(&local->slaves_mtx);
local->running = MAC802154_DEVICE_STOPPED;
mutex_unlock(&local->slaves_mtx);
list_for_each_entry_safe(sdata, next, &local->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(local->phy);
}
EXPORT_SYMBOL(ieee802154_unregister_hw);
MODULE_DESCRIPTION("IEEE 802.15.4 implementation");
MODULE_LICENSE("GPL v2");