Commit | Line | Data |
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2bfb1070 DES |
1 | /* |
2 | * Copyright (C) 2007, 2008, 2009 Siemens AG | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
2bfb1070 DES |
13 | */ |
14 | ||
5a0e3ad6 | 15 | #include <linux/slab.h> |
2bfb1070 DES |
16 | #include <linux/kernel.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/device.h> | |
19 | ||
5ad60d36 | 20 | #include <net/cfg802154.h> |
f3ada640 | 21 | #include <net/rtnetlink.h> |
2bfb1070 | 22 | |
cb6b3763 | 23 | #include "ieee802154.h" |
79fe1a2a | 24 | #include "nl802154.h" |
e23e9ec1 | 25 | #include "sysfs.h" |
a5dd1d72 | 26 | #include "core.h" |
2bfb1070 | 27 | |
c4dd7471 AA |
28 | /* name for sysfs, %d is appended */ |
29 | #define PHY_NAME "phy" | |
30 | ||
f3ada640 | 31 | /* RCU-protected (and RTNL for writers) */ |
79fe1a2a | 32 | LIST_HEAD(cfg802154_rdev_list); |
ca20ce20 | 33 | int cfg802154_rdev_list_generation; |
f3ada640 | 34 | |
9f3b795a | 35 | static int wpan_phy_match(struct device *dev, const void *data) |
2bfb1070 DES |
36 | { |
37 | return !strcmp(dev_name(dev), (const char *)data); | |
38 | } | |
39 | ||
40 | struct wpan_phy *wpan_phy_find(const char *str) | |
41 | { | |
42 | struct device *dev; | |
43 | ||
44 | if (WARN_ON(!str)) | |
45 | return NULL; | |
46 | ||
9f3b795a | 47 | dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match); |
2bfb1070 DES |
48 | if (!dev) |
49 | return NULL; | |
50 | ||
51 | return container_of(dev, struct wpan_phy, dev); | |
52 | } | |
53 | EXPORT_SYMBOL(wpan_phy_find); | |
54 | ||
1c889f4d DES |
55 | struct wpan_phy_iter_data { |
56 | int (*fn)(struct wpan_phy *phy, void *data); | |
57 | void *data; | |
58 | }; | |
59 | ||
60 | static int wpan_phy_iter(struct device *dev, void *_data) | |
61 | { | |
62 | struct wpan_phy_iter_data *wpid = _data; | |
63 | struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); | |
4710d806 | 64 | |
1c889f4d DES |
65 | return wpid->fn(phy, wpid->data); |
66 | } | |
67 | ||
68 | int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data), | |
4710d806 | 69 | void *data) |
1c889f4d DES |
70 | { |
71 | struct wpan_phy_iter_data wpid = { | |
72 | .fn = fn, | |
73 | .data = data, | |
74 | }; | |
75 | ||
76 | return class_for_each_device(&wpan_phy_class, NULL, | |
77 | &wpid, wpan_phy_iter); | |
78 | } | |
79 | EXPORT_SYMBOL(wpan_phy_for_each); | |
80 | ||
79fe1a2a AA |
81 | struct cfg802154_registered_device * |
82 | cfg802154_rdev_by_wpan_phy_idx(int wpan_phy_idx) | |
83 | { | |
84 | struct cfg802154_registered_device *result = NULL, *rdev; | |
85 | ||
86 | ASSERT_RTNL(); | |
87 | ||
88 | list_for_each_entry(rdev, &cfg802154_rdev_list, list) { | |
89 | if (rdev->wpan_phy_idx == wpan_phy_idx) { | |
90 | result = rdev; | |
91 | break; | |
92 | } | |
93 | } | |
94 | ||
95 | return result; | |
96 | } | |
97 | ||
a5dd1d72 | 98 | struct wpan_phy * |
f601379f | 99 | wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size) |
2bfb1070 | 100 | { |
53f9ee61 | 101 | static atomic_t wpan_phy_counter = ATOMIC_INIT(0); |
a5dd1d72 AA |
102 | struct cfg802154_registered_device *rdev; |
103 | size_t alloc_size; | |
104 | ||
105 | alloc_size = sizeof(*rdev) + priv_size; | |
106 | rdev = kzalloc(alloc_size, GFP_KERNEL); | |
107 | if (!rdev) | |
108 | return NULL; | |
109 | ||
110 | rdev->ops = ops; | |
2bfb1070 | 111 | |
53f9ee61 AA |
112 | rdev->wpan_phy_idx = atomic_inc_return(&wpan_phy_counter); |
113 | ||
114 | if (unlikely(rdev->wpan_phy_idx < 0)) { | |
115 | /* ugh, wrapped! */ | |
116 | atomic_dec(&wpan_phy_counter); | |
a5dd1d72 | 117 | kfree(rdev); |
53f9ee61 | 118 | return NULL; |
2bfb1070 | 119 | } |
53f9ee61 AA |
120 | |
121 | /* atomic_inc_return makes it start at 1, make it start at 0 */ | |
122 | rdev->wpan_phy_idx--; | |
2bfb1070 | 123 | |
fcf39e6e | 124 | INIT_LIST_HEAD(&rdev->wpan_dev_list); |
a5dd1d72 | 125 | device_initialize(&rdev->wpan_phy.dev); |
c4dd7471 | 126 | dev_set_name(&rdev->wpan_phy.dev, PHY_NAME "%d", rdev->wpan_phy_idx); |
2bfb1070 | 127 | |
a5dd1d72 AA |
128 | rdev->wpan_phy.dev.class = &wpan_phy_class; |
129 | rdev->wpan_phy.dev.platform_data = rdev; | |
2bfb1070 | 130 | |
fcf39e6e AA |
131 | init_waitqueue_head(&rdev->dev_wait); |
132 | ||
a5dd1d72 | 133 | return &rdev->wpan_phy; |
2bfb1070 | 134 | } |
f601379f | 135 | EXPORT_SYMBOL(wpan_phy_new); |
2bfb1070 | 136 | |
e9cf356c | 137 | int wpan_phy_register(struct wpan_phy *phy) |
2bfb1070 | 138 | { |
f3ada640 AA |
139 | struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy); |
140 | int ret; | |
141 | ||
142 | rtnl_lock(); | |
143 | ret = device_add(&phy->dev); | |
144 | if (ret) { | |
145 | rtnl_unlock(); | |
146 | return ret; | |
147 | } | |
148 | ||
149 | list_add_rcu(&rdev->list, &cfg802154_rdev_list); | |
150 | cfg802154_rdev_list_generation++; | |
151 | ||
152 | /* TODO phy registered lock */ | |
153 | rtnl_unlock(); | |
154 | ||
155 | /* TODO nl802154 phy notify */ | |
156 | ||
157 | return 0; | |
2bfb1070 DES |
158 | } |
159 | EXPORT_SYMBOL(wpan_phy_register); | |
160 | ||
161 | void wpan_phy_unregister(struct wpan_phy *phy) | |
162 | { | |
f3ada640 AA |
163 | struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy); |
164 | ||
fcf39e6e AA |
165 | wait_event(rdev->dev_wait, ({ |
166 | int __count; | |
167 | rtnl_lock(); | |
168 | __count = rdev->opencount; | |
169 | rtnl_unlock(); | |
170 | __count == 0; })); | |
f3ada640 AA |
171 | |
172 | rtnl_lock(); | |
173 | /* TODO nl802154 phy notify */ | |
174 | /* TODO phy registered lock */ | |
175 | ||
fcf39e6e | 176 | WARN_ON(!list_empty(&rdev->wpan_dev_list)); |
f3ada640 AA |
177 | |
178 | /* First remove the hardware from everywhere, this makes | |
179 | * it impossible to find from userspace. | |
180 | */ | |
181 | list_del_rcu(&rdev->list); | |
182 | synchronize_rcu(); | |
183 | ||
184 | cfg802154_rdev_list_generation++; | |
185 | ||
2bfb1070 | 186 | device_del(&phy->dev); |
f3ada640 AA |
187 | |
188 | rtnl_unlock(); | |
2bfb1070 DES |
189 | } |
190 | EXPORT_SYMBOL(wpan_phy_unregister); | |
191 | ||
192 | void wpan_phy_free(struct wpan_phy *phy) | |
193 | { | |
194 | put_device(&phy->dev); | |
195 | } | |
196 | EXPORT_SYMBOL(wpan_phy_free); | |
197 | ||
a5dd1d72 AA |
198 | void cfg802154_dev_free(struct cfg802154_registered_device *rdev) |
199 | { | |
200 | kfree(rdev); | |
201 | } | |
202 | ||
fcf39e6e AA |
203 | static void |
204 | cfg802154_update_iface_num(struct cfg802154_registered_device *rdev, | |
205 | int iftype, int num) | |
206 | { | |
207 | ASSERT_RTNL(); | |
208 | ||
209 | rdev->num_running_ifaces += num; | |
210 | } | |
211 | ||
212 | static int cfg802154_netdev_notifier_call(struct notifier_block *nb, | |
213 | unsigned long state, void *ptr) | |
214 | { | |
215 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
216 | struct wpan_dev *wpan_dev = dev->ieee802154_ptr; | |
217 | struct cfg802154_registered_device *rdev; | |
218 | ||
219 | if (!wpan_dev) | |
220 | return NOTIFY_DONE; | |
221 | ||
222 | rdev = wpan_phy_to_rdev(wpan_dev->wpan_phy); | |
223 | ||
224 | /* TODO WARN_ON unspec type */ | |
225 | ||
226 | switch (state) { | |
227 | /* TODO NETDEV_DEVTYPE */ | |
228 | case NETDEV_REGISTER: | |
f9d1ce8f | 229 | dev->features |= NETIF_F_NETNS_LOCAL; |
fcf39e6e AA |
230 | wpan_dev->identifier = ++rdev->wpan_dev_id; |
231 | list_add_rcu(&wpan_dev->list, &rdev->wpan_dev_list); | |
232 | rdev->devlist_generation++; | |
233 | ||
234 | wpan_dev->netdev = dev; | |
235 | break; | |
236 | case NETDEV_DOWN: | |
237 | cfg802154_update_iface_num(rdev, wpan_dev->iftype, -1); | |
238 | ||
239 | rdev->opencount--; | |
240 | wake_up(&rdev->dev_wait); | |
241 | break; | |
242 | case NETDEV_UP: | |
243 | cfg802154_update_iface_num(rdev, wpan_dev->iftype, 1); | |
244 | ||
245 | rdev->opencount++; | |
246 | break; | |
247 | case NETDEV_UNREGISTER: | |
248 | /* It is possible to get NETDEV_UNREGISTER | |
249 | * multiple times. To detect that, check | |
250 | * that the interface is still on the list | |
251 | * of registered interfaces, and only then | |
252 | * remove and clean it up. | |
253 | */ | |
254 | if (!list_empty(&wpan_dev->list)) { | |
255 | list_del_rcu(&wpan_dev->list); | |
256 | rdev->devlist_generation++; | |
257 | } | |
258 | /* synchronize (so that we won't find this netdev | |
259 | * from other code any more) and then clear the list | |
260 | * head so that the above code can safely check for | |
261 | * !list_empty() to avoid double-cleanup. | |
262 | */ | |
263 | synchronize_rcu(); | |
264 | INIT_LIST_HEAD(&wpan_dev->list); | |
265 | break; | |
266 | default: | |
267 | return NOTIFY_DONE; | |
268 | } | |
269 | ||
270 | return NOTIFY_OK; | |
271 | } | |
272 | ||
273 | static struct notifier_block cfg802154_netdev_notifier = { | |
274 | .notifier_call = cfg802154_netdev_notifier_call, | |
275 | }; | |
276 | ||
2bfb1070 DES |
277 | static int __init wpan_phy_class_init(void) |
278 | { | |
cb6b3763 | 279 | int rc; |
4710d806 | 280 | |
e23e9ec1 | 281 | rc = wpan_phy_sysfs_init(); |
cb6b3763 DES |
282 | if (rc) |
283 | goto err; | |
284 | ||
fcf39e6e | 285 | rc = register_netdevice_notifier(&cfg802154_netdev_notifier); |
cb6b3763 DES |
286 | if (rc) |
287 | goto err_nl; | |
288 | ||
fcf39e6e AA |
289 | rc = ieee802154_nl_init(); |
290 | if (rc) | |
291 | goto err_notifier; | |
292 | ||
79fe1a2a AA |
293 | rc = nl802154_init(); |
294 | if (rc) | |
295 | goto err_ieee802154_nl; | |
296 | ||
cb6b3763 | 297 | return 0; |
fcf39e6e | 298 | |
79fe1a2a AA |
299 | err_ieee802154_nl: |
300 | ieee802154_nl_exit(); | |
301 | ||
fcf39e6e AA |
302 | err_notifier: |
303 | unregister_netdevice_notifier(&cfg802154_netdev_notifier); | |
cb6b3763 | 304 | err_nl: |
e23e9ec1 | 305 | wpan_phy_sysfs_exit(); |
cb6b3763 DES |
306 | err: |
307 | return rc; | |
2bfb1070 | 308 | } |
282a3954 | 309 | subsys_initcall(wpan_phy_class_init); |
2bfb1070 DES |
310 | |
311 | static void __exit wpan_phy_class_exit(void) | |
312 | { | |
79fe1a2a | 313 | nl802154_exit(); |
cb6b3763 | 314 | ieee802154_nl_exit(); |
fcf39e6e | 315 | unregister_netdevice_notifier(&cfg802154_netdev_notifier); |
e23e9ec1 | 316 | wpan_phy_sysfs_exit(); |
2bfb1070 DES |
317 | } |
318 | module_exit(wpan_phy_class_exit); | |
319 | ||
2bfb1070 | 320 | MODULE_LICENSE("GPL v2"); |
cb6b3763 DES |
321 | MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface"); |
322 | MODULE_AUTHOR("Dmitry Eremin-Solenikov"); | |
2bfb1070 | 323 |