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
27 #include <net/netlink.h>
28 #include <linux/nl802154.h>
29 #include <net/mac802154.h>
30 #include <net/route.h>
31 #include <net/wpan-phy.h>
32
33 #include "mac802154.h"
34
mac802154_slave_open(struct net_device * dev)35 int 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;
58 err:
59 priv->hw->open_count--;
60
61 return res;
62 }
63
mac802154_slave_close(struct net_device * dev)64 int 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
77 static int
mac802154_netdev_register(struct wpan_phy * phy,struct net_device * dev)78 mac802154_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
114 static void
mac802154_del_iface(struct wpan_phy * phy,struct net_device * dev)115 mac802154_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
132 static struct net_device *
mac802154_add_iface(struct wpan_phy * phy,const char * name,int type)133 mac802154_add_iface(struct wpan_phy *phy, const char *name, int type)
134 {
135 struct net_device *dev;
136 int err = -ENOMEM;
137
138 switch (type) {
139 case IEEE802154_DEV_MONITOR:
140 dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
141 name, mac802154_monitor_setup);
142 break;
143 case IEEE802154_DEV_WPAN:
144 dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
145 name, mac802154_wpan_setup);
146 break;
147 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
162 err_free:
163 free_netdev(dev);
164 err:
165 return ERR_PTR(err);
166 }
167
168 struct ieee802154_dev *
ieee802154_alloc_device(size_t priv_data_len,struct ieee802154_ops * ops)169 ieee802154_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) {
177 printk(KERN_ERR
178 "undefined IEEE802.15.4 device operations\n");
179 return NULL;
180 }
181
182 /* Ensure 32-byte alignment of our private data and hw private data.
183 * We use the wpan_phy priv data for both our mac802154_priv and for
184 * the driver's private data
185 *
186 * in memory it'll be like this:
187 *
188 * +-----------------------+
189 * | struct wpan_phy |
190 * +-----------------------+
191 * | struct mac802154_priv |
192 * +-----------------------+
193 * | driver's private data |
194 * +-----------------------+
195 *
196 * Due to ieee802154 layer isn't aware of driver and MAC structures,
197 * so lets allign them here.
198 */
199
200 priv_size = ALIGN(sizeof(*priv), NETDEV_ALIGN) + priv_data_len;
201
202 phy = wpan_phy_alloc(priv_size);
203 if (!phy) {
204 printk(KERN_ERR
205 "failure to allocate master IEEE802.15.4 device\n");
206 return NULL;
207 }
208
209 priv = wpan_phy_priv(phy);
210 priv->hw.phy = priv->phy = phy;
211 priv->hw.priv = (char *)priv + ALIGN(sizeof(*priv), NETDEV_ALIGN);
212 priv->ops = ops;
213
214 INIT_LIST_HEAD(&priv->slaves);
215 mutex_init(&priv->slaves_mtx);
216
217 return &priv->hw;
218 }
219 EXPORT_SYMBOL(ieee802154_alloc_device);
220
ieee802154_free_device(struct ieee802154_dev * hw)221 void ieee802154_free_device(struct ieee802154_dev *hw)
222 {
223 struct mac802154_priv *priv = mac802154_to_priv(hw);
224
225 BUG_ON(!list_empty(&priv->slaves));
226
227 mutex_destroy(&priv->slaves_mtx);
228
229 wpan_phy_free(priv->phy);
230 }
231 EXPORT_SYMBOL(ieee802154_free_device);
232
ieee802154_register_device(struct ieee802154_dev * dev)233 int ieee802154_register_device(struct ieee802154_dev *dev)
234 {
235 struct mac802154_priv *priv = mac802154_to_priv(dev);
236 int rc = -ENOMEM;
237
238 priv->dev_workqueue =
239 create_singlethread_workqueue(wpan_phy_name(priv->phy));
240 if (!priv->dev_workqueue)
241 goto out;
242
243 wpan_phy_set_dev(priv->phy, priv->hw.parent);
244
245 priv->phy->add_iface = mac802154_add_iface;
246 priv->phy->del_iface = mac802154_del_iface;
247
248 rc = wpan_phy_register(priv->phy);
249 if (rc < 0)
250 goto out_wq;
251
252 rtnl_lock();
253
254 mutex_lock(&priv->slaves_mtx);
255 priv->running = MAC802154_DEVICE_RUN;
256 mutex_unlock(&priv->slaves_mtx);
257
258 rtnl_unlock();
259
260 return 0;
261
262 out_wq:
263 destroy_workqueue(priv->dev_workqueue);
264 out:
265 return rc;
266 }
267 EXPORT_SYMBOL(ieee802154_register_device);
268
ieee802154_unregister_device(struct ieee802154_dev * dev)269 void ieee802154_unregister_device(struct ieee802154_dev *dev)
270 {
271 struct mac802154_priv *priv = mac802154_to_priv(dev);
272 struct mac802154_sub_if_data *sdata, *next;
273
274 flush_workqueue(priv->dev_workqueue);
275 destroy_workqueue(priv->dev_workqueue);
276
277 rtnl_lock();
278
279 mutex_lock(&priv->slaves_mtx);
280 priv->running = MAC802154_DEVICE_STOPPED;
281 mutex_unlock(&priv->slaves_mtx);
282
283 list_for_each_entry_safe(sdata, next, &priv->slaves, list) {
284 mutex_lock(&sdata->hw->slaves_mtx);
285 list_del(&sdata->list);
286 mutex_unlock(&sdata->hw->slaves_mtx);
287
288 unregister_netdevice(sdata->dev);
289 }
290
291 rtnl_unlock();
292
293 wpan_phy_unregister(priv->phy);
294 }
295 EXPORT_SYMBOL(ieee802154_unregister_device);
296
297 MODULE_DESCRIPTION("IEEE 802.15.4 implementation");
298 MODULE_LICENSE("GPL v2");
299