[linux-2.6-block.git] / net / mac802154 / ieee802154_dev.c

/*
 * 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/ieee802154_netdev.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) {
		__le64 addr = ieee802154_devaddr_from_raw(dev->dev_addr);

		res = ipriv->ops->ieee_addr(&ipriv->hw, 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);
}

static int mac802154_set_txpower(struct wpan_phy *phy, int db)
{
	struct mac802154_priv *priv = wpan_phy_priv(phy);

	if (!priv->ops->set_txpower)
		return -ENOTSUPP;

	return priv->ops->set_txpower(&priv->hw, db);
}

static int mac802154_set_lbt(struct wpan_phy *phy, bool on)
{
	struct mac802154_priv *priv = wpan_phy_priv(phy);

	if (!priv->ops->set_lbt)
		return -ENOTSUPP;

	return priv->ops->set_lbt(&priv->hw, on);
}

static int mac802154_set_cca_mode(struct wpan_phy *phy, u8 mode)
{
	struct mac802154_priv *priv = wpan_phy_priv(phy);

	if (!priv->ops->set_cca_mode)
		return -ENOTSUPP;

	return priv->ops->set_cca_mode(&priv->hw, mode);
}

static int mac802154_set_cca_ed_level(struct wpan_phy *phy, s32 level)
{
	struct mac802154_priv *priv = wpan_phy_priv(phy);

	if (!priv->ops->set_cca_ed_level)
		return -ENOTSUPP;

	return priv->ops->set_cca_ed_level(&priv->hw, level);
}

static int mac802154_set_csma_params(struct wpan_phy *phy, u8 min_be,
				     u8 max_be, u8 retries)
{
	struct mac802154_priv *priv = wpan_phy_priv(phy);

	if (!priv->ops->set_csma_params)
		return -ENOTSUPP;

	return priv->ops->set_csma_params(&priv->hw, min_be, max_be, retries);
}

static int mac802154_set_frame_retries(struct wpan_phy *phy, s8 retries)
{
	struct mac802154_priv *priv = wpan_phy_priv(phy);

	if (!priv->ops->set_frame_retries)
		return -ENOTSUPP;

	return priv->ops->set_frame_retries(&priv->hw, retries);
}

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;
	priv->phy->set_txpower = mac802154_set_txpower;
	priv->phy->set_lbt = mac802154_set_lbt;
	priv->phy->set_cca_mode = mac802154_set_cca_mode;
	priv->phy->set_cca_ed_level = mac802154_set_cca_ed_level;
	priv->phy->set_csma_params = mac802154_set_csma_params;
	priv->phy->set_frame_retries = mac802154_set_frame_retries;

	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");
Commit	Line	Data
1010f540	1	/*
	2	* Copyright (C) 2007-2012 Siemens AG
	3	*
	4	* Written by:
	5	* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
	6	*
	7	* Based on the code from 'linux-zigbee.sourceforge.net' project.
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2
	11	* as published by the Free Software Foundation.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License along
	19	* with this program; if not, write to the Free Software Foundation, Inc.,
	20	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	21	*/
	22
	23	#include <linux/kernel.h>
	24	#include <linux/module.h>
	25	#include <linux/netdevice.h>
	26
62610ad2	27	#include <net/netlink.h>
62610ad2	28	#include <linux/nl802154.h>
1010f540	29	#include <net/mac802154.h>
b70ab2e8	30	#include <net/ieee802154_netdev.h>
1010f540	31	#include <net/route.h>
	32	#include <net/wpan-phy.h>
	33
	34	#include "mac802154.h"
	35
62610ad2	36	int mac802154_slave_open(struct net_device *dev)
	37	{
	38	struct mac802154_sub_if_data *priv = netdev_priv(dev);
	39	struct mac802154_priv *ipriv = priv->hw;
	40	int res = 0;
	41
	42	if (ipriv->open_count++ == 0) {
	43	res = ipriv->ops->start(&ipriv->hw);
	44	WARN_ON(res);
	45	if (res)
	46	goto err;
	47	}
	48
	49	if (ipriv->ops->ieee_addr) {
b70ab2e8 PB	50	__le64 addr = ieee802154_devaddr_from_raw(dev->dev_addr);
	51
	52	res = ipriv->ops->ieee_addr(&ipriv->hw, addr);
62610ad2	53	WARN_ON(res);
	54	if (res)
	55	goto err;
	56	mac802154_dev_set_ieee_addr(dev);
	57	}
	58
	59	netif_start_queue(dev);
	60	return 0;
	61	err:
	62	priv->hw->open_count--;
	63
	64	return res;
	65	}
	66
	67	int mac802154_slave_close(struct net_device *dev)
	68	{
	69	struct mac802154_sub_if_data *priv = netdev_priv(dev);
	70	struct mac802154_priv *ipriv = priv->hw;
	71
	72	netif_stop_queue(dev);
	73
	74	if (!--ipriv->open_count)
	75	ipriv->ops->stop(&ipriv->hw);
	76
	77	return 0;
	78	}
	79
	80	static int
	81	mac802154_netdev_register(struct wpan_phy phy, struct net_device dev)
	82	{
	83	struct mac802154_sub_if_data *priv;
	84	struct mac802154_priv *ipriv;
	85	int err;
	86
	87	ipriv = wpan_phy_priv(phy);
	88
	89	priv = netdev_priv(dev);
	90	priv->dev = dev;
	91	priv->hw = ipriv;
	92
	93	dev->needed_headroom = ipriv->hw.extra_tx_headroom;
	94
	95	SET_NETDEV_DEV(dev, &ipriv->phy->dev);
	96
	97	mutex_lock(&ipriv->slaves_mtx);
	98	if (!ipriv->running) {
	99	mutex_unlock(&ipriv->slaves_mtx);
	100	return -ENODEV;
	101	}
	102	mutex_unlock(&ipriv->slaves_mtx);
	103
	104	err = register_netdev(dev);
	105	if (err < 0)
	106	return err;
	107
	108	rtnl_lock();
	109	mutex_lock(&ipriv->slaves_mtx);
	110	list_add_tail_rcu(&priv->list, &ipriv->slaves);
	111	mutex_unlock(&ipriv->slaves_mtx);
	112	rtnl_unlock();
	113
	114	return 0;
	115	}
	116
117	static void
118	mac802154_del_iface(struct wpan_phy phy, struct net_device dev)
119	{
120	struct mac802154_sub_if_data *sdata;
121	ASSERT_RTNL();
122
123	sdata = netdev_priv(dev);
124
125	BUG_ON(sdata->hw->phy != phy);
126
127	mutex_lock(&sdata->hw->slaves_mtx);
128	list_del_rcu(&sdata->list);
129	mutex_unlock(&sdata->hw->slaves_mtx);
130
131	synchronize_rcu();
132	unregister_netdevice(sdata->dev);
133	}
134
135	static struct net_device *
136	mac802154_add_iface(struct wpan_phy phy, const char name, int type)
137	{
138	struct net_device *dev;
139	int err = -ENOMEM;
140
62610ad2	141	switch (type) {
0606069d	142	case IEEE802154_DEV_MONITOR:
	143	dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
	144	name, mac802154_monitor_setup);
	145	break;
32bad7e3	146	case IEEE802154_DEV_WPAN:
	147	dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
	148	name, mac802154_wpan_setup);
	149	break;
62610ad2	150	default:
	151	dev = NULL;
	152	err = -EINVAL;
	153	break;
	154	}
	155	if (!dev)
	156	goto err;
	157
	158	err = mac802154_netdev_register(phy, dev);
	159	if (err)
	160	goto err_free;
	161
	162	dev_hold(dev); /* we return an incremented device refcount */
	163	return dev;
	164
	165	err_free:
	166	free_netdev(dev);
	167	err:
	168	return ERR_PTR(err);
	169	}
	170
9b2777d6 PB	171	static int mac802154_set_txpower(struct wpan_phy *phy, int db)
	172	{
	173	struct mac802154_priv *priv = wpan_phy_priv(phy);
	174
	175	if (!priv->ops->set_txpower)
	176	return -ENOTSUPP;
	177
	178	return priv->ops->set_txpower(&priv->hw, db);
	179	}
	180
84dda3c6 PB	181	static int mac802154_set_lbt(struct wpan_phy *phy, bool on)
	182	{
	183	struct mac802154_priv *priv = wpan_phy_priv(phy);
	184
	185	if (!priv->ops->set_lbt)
	186	return -ENOTSUPP;
	187
	188	return priv->ops->set_lbt(&priv->hw, on);
	189	}
	190
ba08fea5 PB	191	static int mac802154_set_cca_mode(struct wpan_phy *phy, u8 mode)
	192	{
	193	struct mac802154_priv *priv = wpan_phy_priv(phy);
	194
	195	if (!priv->ops->set_cca_mode)
	196	return -ENOTSUPP;
	197
	198	return priv->ops->set_cca_mode(&priv->hw, mode);
	199	}
	200
6ca00197 PB	201	static int mac802154_set_cca_ed_level(struct wpan_phy *phy, s32 level)
	202	{
	203	struct mac802154_priv *priv = wpan_phy_priv(phy);
	204
	205	if (!priv->ops->set_cca_ed_level)
	206	return -ENOTSUPP;
	207
	208	return priv->ops->set_cca_ed_level(&priv->hw, level);
	209	}
	210
4244db1b PB	211	static int mac802154_set_csma_params(struct wpan_phy *phy, u8 min_be,
	212	u8 max_be, u8 retries)
	213	{
	214	struct mac802154_priv *priv = wpan_phy_priv(phy);
	215
	216	if (!priv->ops->set_csma_params)
	217	return -ENOTSUPP;
	218
	219	return priv->ops->set_csma_params(&priv->hw, min_be, max_be, retries);
	220	}
	221
	222	static int mac802154_set_frame_retries(struct wpan_phy *phy, s8 retries)
	223	{
	224	struct mac802154_priv *priv = wpan_phy_priv(phy);
	225
	226	if (!priv->ops->set_frame_retries)
	227	return -ENOTSUPP;
	228
	229	return priv->ops->set_frame_retries(&priv->hw, retries);
	230	}
	231
1010f540	232	struct ieee802154_dev *
	233	ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops)
	234	{
	235	struct wpan_phy *phy;
	236	struct mac802154_priv *priv;
	237	size_t priv_size;
	238
	239	if (!ops \|\| !ops->xmit \|\| !ops->ed \|\| !ops->start \|\|
	240	!ops->stop \|\| !ops->set_channel) {
83a1a7ce	241	pr_err("undefined IEEE802.15.4 device operations\n");
1010f540	242	return NULL;
	243	}
	244
	245	/* Ensure 32-byte alignment of our private data and hw private data.
	246	* We use the wpan_phy priv data for both our mac802154_priv and for
	247	* the driver's private data
	248	*
	249	* in memory it'll be like this:
	250	*
	251	* +-----------------------+
	252	* \| struct wpan_phy \|
	253	* +-----------------------+
	254	* \| struct mac802154_priv \|
	255	* +-----------------------+
	256	* \| driver's private data \|
	257	* +-----------------------+
	258	*
	259	* Due to ieee802154 layer isn't aware of driver and MAC structures,
	260	* so lets allign them here.
	261	*/
	262
	263	priv_size = ALIGN(sizeof(*priv), NETDEV_ALIGN) + priv_data_len;
	264
	265	phy = wpan_phy_alloc(priv_size);
	266	if (!phy) {
83a1a7ce	267	pr_err("failure to allocate master IEEE802.15.4 device\n");
1010f540	268	return NULL;
	269	}
	270
	271	priv = wpan_phy_priv(phy);
	272	priv->hw.phy = priv->phy = phy;
	273	priv->hw.priv = (char )priv + ALIGN(sizeof(priv), NETDEV_ALIGN);
	274	priv->ops = ops;
	275
	276	INIT_LIST_HEAD(&priv->slaves);
	277	mutex_init(&priv->slaves_mtx);
	278
	279	return &priv->hw;
	280	}
	281	EXPORT_SYMBOL(ieee802154_alloc_device);
	282
	283	void ieee802154_free_device(struct ieee802154_dev *hw)
	284	{
	285	struct mac802154_priv *priv = mac802154_to_priv(hw);
	286
62610ad2	287	BUG_ON(!list_empty(&priv->slaves));
62610ad2	288
1010f540	289	mutex_destroy(&priv->slaves_mtx);
1e9f9545 KK	290
1e9f9545 KK	291	wpan_phy_free(priv->phy);
1010f540	292	}
	293	EXPORT_SYMBOL(ieee802154_free_device);
	294
	295	int ieee802154_register_device(struct ieee802154_dev *dev)
	296	{
	297	struct mac802154_priv *priv = mac802154_to_priv(dev);
	298	int rc = -ENOMEM;
	299
	300	priv->dev_workqueue =
	301	create_singlethread_workqueue(wpan_phy_name(priv->phy));
	302	if (!priv->dev_workqueue)
	303	goto out;
	304
	305	wpan_phy_set_dev(priv->phy, priv->hw.parent);
	306
62610ad2	307	priv->phy->add_iface = mac802154_add_iface;
62610ad2	308	priv->phy->del_iface = mac802154_del_iface;
9b2777d6	309	priv->phy->set_txpower = mac802154_set_txpower;
84dda3c6	310	priv->phy->set_lbt = mac802154_set_lbt;
ba08fea5	311	priv->phy->set_cca_mode = mac802154_set_cca_mode;
6ca00197	312	priv->phy->set_cca_ed_level = mac802154_set_cca_ed_level;
4244db1b PB	313	priv->phy->set_csma_params = mac802154_set_csma_params;
4244db1b PB	314	priv->phy->set_frame_retries = mac802154_set_frame_retries;
62610ad2	315
1010f540	316	rc = wpan_phy_register(priv->phy);
	317	if (rc < 0)
	318	goto out_wq;
	319
	320	rtnl_lock();
	321
	322	mutex_lock(&priv->slaves_mtx);
	323	priv->running = MAC802154_DEVICE_RUN;
	324	mutex_unlock(&priv->slaves_mtx);
	325
	326	rtnl_unlock();
	327
	328	return 0;
	329
	330	out_wq:
	331	destroy_workqueue(priv->dev_workqueue);
	332	out:
	333	return rc;
	334	}
	335	EXPORT_SYMBOL(ieee802154_register_device);
	336
	337	void ieee802154_unregister_device(struct ieee802154_dev *dev)
	338	{
	339	struct mac802154_priv *priv = mac802154_to_priv(dev);
62610ad2	340	struct mac802154_sub_if_data sdata, next;
1010f540	341
	342	flush_workqueue(priv->dev_workqueue);
	343	destroy_workqueue(priv->dev_workqueue);
	344
	345	rtnl_lock();
	346
	347	mutex_lock(&priv->slaves_mtx);
	348	priv->running = MAC802154_DEVICE_STOPPED;
	349	mutex_unlock(&priv->slaves_mtx);
	350
62610ad2	351	list_for_each_entry_safe(sdata, next, &priv->slaves, list) {
	352	mutex_lock(&sdata->hw->slaves_mtx);
	353	list_del(&sdata->list);
	354	mutex_unlock(&sdata->hw->slaves_mtx);
	355
	356	unregister_netdevice(sdata->dev);
	357	}
	358
1010f540	359	rtnl_unlock();
	360
	361	wpan_phy_unregister(priv->phy);
	362	}
	363	EXPORT_SYMBOL(ieee802154_unregister_device);
	364
	365	MODULE_DESCRIPTION("IEEE 802.15.4 implementation");
	366	MODULE_LICENSE("GPL v2");