blob: 52ae6646a41140e065920ee80c4df626c6a58594 [file] [log] [blame]
alex.bluesman.smirnov@gmail.com1010f542012-05-15 20:50:20 +00001/*
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
alex.bluesman.smirnov@gmail.com62610ad2012-05-15 20:50:28 +000027#include <net/netlink.h>
28#include <linux/nl802154.h>
alex.bluesman.smirnov@gmail.com1010f542012-05-15 20:50:20 +000029#include <net/mac802154.h>
30#include <net/route.h>
31#include <net/wpan-phy.h>
32
33#include "mac802154.h"
34
alex.bluesman.smirnov@gmail.com62610ad2012-05-15 20:50:28 +000035int mac802154_slave_open(struct net_device *dev)
36{
37 struct mac802154_sub_if_data *priv = netdev_priv(dev);
38 struct mac802154_priv *ipriv = priv->hw;
39 int res = 0;
40
41 if (ipriv->open_count++ == 0) {
42 res = ipriv->ops->start(&ipriv->hw);
43 WARN_ON(res);
44 if (res)
45 goto err;
46 }
47
48 if (ipriv->ops->ieee_addr) {
49 res = ipriv->ops->ieee_addr(&ipriv->hw, dev->dev_addr);
50 WARN_ON(res);
51 if (res)
52 goto err;
53 mac802154_dev_set_ieee_addr(dev);
54 }
55
56 netif_start_queue(dev);
57 return 0;
58err:
59 priv->hw->open_count--;
60
61 return res;
62}
63
64int mac802154_slave_close(struct net_device *dev)
65{
66 struct mac802154_sub_if_data *priv = netdev_priv(dev);
67 struct mac802154_priv *ipriv = priv->hw;
68
69 netif_stop_queue(dev);
70
71 if (!--ipriv->open_count)
72 ipriv->ops->stop(&ipriv->hw);
73
74 return 0;
75}
76
77static int
78mac802154_netdev_register(struct wpan_phy *phy, struct net_device *dev)
79{
80 struct mac802154_sub_if_data *priv;
81 struct mac802154_priv *ipriv;
82 int err;
83
84 ipriv = wpan_phy_priv(phy);
85
86 priv = netdev_priv(dev);
87 priv->dev = dev;
88 priv->hw = ipriv;
89
90 dev->needed_headroom = ipriv->hw.extra_tx_headroom;
91
92 SET_NETDEV_DEV(dev, &ipriv->phy->dev);
93
94 mutex_lock(&ipriv->slaves_mtx);
95 if (!ipriv->running) {
96 mutex_unlock(&ipriv->slaves_mtx);
97 return -ENODEV;
98 }
99 mutex_unlock(&ipriv->slaves_mtx);
100
101 err = register_netdev(dev);
102 if (err < 0)
103 return err;
104
105 rtnl_lock();
106 mutex_lock(&ipriv->slaves_mtx);
107 list_add_tail_rcu(&priv->list, &ipriv->slaves);
108 mutex_unlock(&ipriv->slaves_mtx);
109 rtnl_unlock();
110
111 return 0;
112}
113
114static void
115mac802154_del_iface(struct wpan_phy *phy, struct net_device *dev)
116{
117 struct mac802154_sub_if_data *sdata;
118 ASSERT_RTNL();
119
120 sdata = netdev_priv(dev);
121
122 BUG_ON(sdata->hw->phy != phy);
123
124 mutex_lock(&sdata->hw->slaves_mtx);
125 list_del_rcu(&sdata->list);
126 mutex_unlock(&sdata->hw->slaves_mtx);
127
128 synchronize_rcu();
129 unregister_netdevice(sdata->dev);
130}
131
132static struct net_device *
133mac802154_add_iface(struct wpan_phy *phy, const char *name, int type)
134{
135 struct net_device *dev;
136 int err = -ENOMEM;
137
alex.bluesman.smirnov@gmail.com62610ad2012-05-15 20:50:28 +0000138 switch (type) {
alex.bluesman.smirnov@gmail.com06060692012-05-15 20:50:29 +0000139 case IEEE802154_DEV_MONITOR:
140 dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
141 name, mac802154_monitor_setup);
142 break;
alex.bluesman.smirnov@gmail.com32bad7e2012-06-25 23:24:48 +0000143 case IEEE802154_DEV_WPAN:
144 dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
145 name, mac802154_wpan_setup);
146 break;
alex.bluesman.smirnov@gmail.com62610ad2012-05-15 20:50:28 +0000147 default:
148 dev = NULL;
149 err = -EINVAL;
150 break;
151 }
152 if (!dev)
153 goto err;
154
155 err = mac802154_netdev_register(phy, dev);
156 if (err)
157 goto err_free;
158
159 dev_hold(dev); /* we return an incremented device refcount */
160 return dev;
161
162err_free:
163 free_netdev(dev);
164err:
165 return ERR_PTR(err);
166}
167
alex.bluesman.smirnov@gmail.com1010f542012-05-15 20:50:20 +0000168struct ieee802154_dev *
169ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops)
170{
171 struct wpan_phy *phy;
172 struct mac802154_priv *priv;
173 size_t priv_size;
174
175 if (!ops || !ops->xmit || !ops->ed || !ops->start ||
176 !ops->stop || !ops->set_channel) {
Chen Weilong83a1a7c2013-10-30 15:28:07 +0800177 pr_err("undefined IEEE802.15.4 device operations\n");
alex.bluesman.smirnov@gmail.com1010f542012-05-15 20:50:20 +0000178 return NULL;
179 }
180
181 /* Ensure 32-byte alignment of our private data and hw private data.
182 * We use the wpan_phy priv data for both our mac802154_priv and for
183 * the driver's private data
184 *
185 * in memory it'll be like this:
186 *
187 * +-----------------------+
188 * | struct wpan_phy |
189 * +-----------------------+
190 * | struct mac802154_priv |
191 * +-----------------------+
192 * | driver's private data |
193 * +-----------------------+
194 *
195 * Due to ieee802154 layer isn't aware of driver and MAC structures,
196 * so lets allign them here.
197 */
198
199 priv_size = ALIGN(sizeof(*priv), NETDEV_ALIGN) + priv_data_len;
200
201 phy = wpan_phy_alloc(priv_size);
202 if (!phy) {
Chen Weilong83a1a7c2013-10-30 15:28:07 +0800203 pr_err("failure to allocate master IEEE802.15.4 device\n");
alex.bluesman.smirnov@gmail.com1010f542012-05-15 20:50:20 +0000204 return NULL;
205 }
206
207 priv = wpan_phy_priv(phy);
208 priv->hw.phy = priv->phy = phy;
209 priv->hw.priv = (char *)priv + ALIGN(sizeof(*priv), NETDEV_ALIGN);
210 priv->ops = ops;
211
212 INIT_LIST_HEAD(&priv->slaves);
213 mutex_init(&priv->slaves_mtx);
214
215 return &priv->hw;
216}
217EXPORT_SYMBOL(ieee802154_alloc_device);
218
219void ieee802154_free_device(struct ieee802154_dev *hw)
220{
221 struct mac802154_priv *priv = mac802154_to_priv(hw);
222
alex.bluesman.smirnov@gmail.com62610ad2012-05-15 20:50:28 +0000223 BUG_ON(!list_empty(&priv->slaves));
224
alex.bluesman.smirnov@gmail.com1010f542012-05-15 20:50:20 +0000225 mutex_destroy(&priv->slaves_mtx);
Konstantin Khlebnikov1e9f9542012-12-14 01:03:03 +0000226
227 wpan_phy_free(priv->phy);
alex.bluesman.smirnov@gmail.com1010f542012-05-15 20:50:20 +0000228}
229EXPORT_SYMBOL(ieee802154_free_device);
230
231int ieee802154_register_device(struct ieee802154_dev *dev)
232{
233 struct mac802154_priv *priv = mac802154_to_priv(dev);
234 int rc = -ENOMEM;
235
236 priv->dev_workqueue =
237 create_singlethread_workqueue(wpan_phy_name(priv->phy));
238 if (!priv->dev_workqueue)
239 goto out;
240
241 wpan_phy_set_dev(priv->phy, priv->hw.parent);
242
alex.bluesman.smirnov@gmail.com62610ad2012-05-15 20:50:28 +0000243 priv->phy->add_iface = mac802154_add_iface;
244 priv->phy->del_iface = mac802154_del_iface;
245
alex.bluesman.smirnov@gmail.com1010f542012-05-15 20:50:20 +0000246 rc = wpan_phy_register(priv->phy);
247 if (rc < 0)
248 goto out_wq;
249
250 rtnl_lock();
251
252 mutex_lock(&priv->slaves_mtx);
253 priv->running = MAC802154_DEVICE_RUN;
254 mutex_unlock(&priv->slaves_mtx);
255
256 rtnl_unlock();
257
258 return 0;
259
260out_wq:
261 destroy_workqueue(priv->dev_workqueue);
262out:
263 return rc;
264}
265EXPORT_SYMBOL(ieee802154_register_device);
266
267void ieee802154_unregister_device(struct ieee802154_dev *dev)
268{
269 struct mac802154_priv *priv = mac802154_to_priv(dev);
alex.bluesman.smirnov@gmail.com62610ad2012-05-15 20:50:28 +0000270 struct mac802154_sub_if_data *sdata, *next;
alex.bluesman.smirnov@gmail.com1010f542012-05-15 20:50:20 +0000271
272 flush_workqueue(priv->dev_workqueue);
273 destroy_workqueue(priv->dev_workqueue);
274
275 rtnl_lock();
276
277 mutex_lock(&priv->slaves_mtx);
278 priv->running = MAC802154_DEVICE_STOPPED;
279 mutex_unlock(&priv->slaves_mtx);
280
alex.bluesman.smirnov@gmail.com62610ad2012-05-15 20:50:28 +0000281 list_for_each_entry_safe(sdata, next, &priv->slaves, list) {
282 mutex_lock(&sdata->hw->slaves_mtx);
283 list_del(&sdata->list);
284 mutex_unlock(&sdata->hw->slaves_mtx);
285
286 unregister_netdevice(sdata->dev);
287 }
288
alex.bluesman.smirnov@gmail.com1010f542012-05-15 20:50:20 +0000289 rtnl_unlock();
290
291 wpan_phy_unregister(priv->phy);
292}
293EXPORT_SYMBOL(ieee802154_unregister_device);
294
295MODULE_DESCRIPTION("IEEE 802.15.4 implementation");
296MODULE_LICENSE("GPL v2");