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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> |
28 | #include <linux/nl802154.h> | |
1010f540 | 29 | #include <net/mac802154.h> |
30 | #include <net/route.h> | |
31 | #include <net/wpan-phy.h> | |
32 | ||
33 | #include "mac802154.h" | |
34 | ||
62610ad2 | 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 | ||
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 | |
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 | |
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 * | |
133 | mac802154_add_iface(struct wpan_phy *phy, const char *name, int type) | |
134 | { | |
135 | struct net_device *dev; | |
136 | int err = -ENOMEM; | |
137 | ||
62610ad2 | 138 | switch (type) { |
0606069d | 139 | case IEEE802154_DEV_MONITOR: |
140 | dev = alloc_netdev(sizeof(struct mac802154_sub_if_data), | |
141 | name, mac802154_monitor_setup); | |
142 | break; | |
32bad7e3 | 143 | case IEEE802154_DEV_WPAN: |
144 | dev = alloc_netdev(sizeof(struct mac802154_sub_if_data), | |
145 | name, mac802154_wpan_setup); | |
146 | break; | |
62610ad2 | 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 | ||
1010f540 | 168 | struct ieee802154_dev * |
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) { | |
83a1a7ce | 177 | pr_err("undefined IEEE802.15.4 device operations\n"); |
1010f540 | 178 | 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) { | |
83a1a7ce | 203 | pr_err("failure to allocate master IEEE802.15.4 device\n"); |
1010f540 | 204 | 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 | } | |
217 | EXPORT_SYMBOL(ieee802154_alloc_device); | |
218 | ||
219 | void ieee802154_free_device(struct ieee802154_dev *hw) | |
220 | { | |
221 | struct mac802154_priv *priv = mac802154_to_priv(hw); | |
222 | ||
62610ad2 | 223 | BUG_ON(!list_empty(&priv->slaves)); |
224 | ||
1010f540 | 225 | mutex_destroy(&priv->slaves_mtx); |
1e9f9545 KK |
226 | |
227 | wpan_phy_free(priv->phy); | |
1010f540 | 228 | } |
229 | EXPORT_SYMBOL(ieee802154_free_device); | |
230 | ||
231 | int 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 | ||
62610ad2 | 243 | priv->phy->add_iface = mac802154_add_iface; |
244 | priv->phy->del_iface = mac802154_del_iface; | |
245 | ||
1010f540 | 246 | 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 | ||
260 | out_wq: | |
261 | destroy_workqueue(priv->dev_workqueue); | |
262 | out: | |
263 | return rc; | |
264 | } | |
265 | EXPORT_SYMBOL(ieee802154_register_device); | |
266 | ||
267 | void ieee802154_unregister_device(struct ieee802154_dev *dev) | |
268 | { | |
269 | struct mac802154_priv *priv = mac802154_to_priv(dev); | |
62610ad2 | 270 | struct mac802154_sub_if_data *sdata, *next; |
1010f540 | 271 | |
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 | ||
62610ad2 | 281 | 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 | ||
1010f540 | 289 | rtnl_unlock(); |
290 | ||
291 | wpan_phy_unregister(priv->phy); | |
292 | } | |
293 | EXPORT_SYMBOL(ieee802154_unregister_device); | |
294 | ||
295 | MODULE_DESCRIPTION("IEEE 802.15.4 implementation"); | |
296 | MODULE_LICENSE("GPL v2"); |