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 | ||
a26c5fd7 AA |
98 | struct wpan_phy *wpan_phy_idx_to_wpan_phy(int wpan_phy_idx) |
99 | { | |
100 | struct cfg802154_registered_device *rdev; | |
101 | ||
102 | ASSERT_RTNL(); | |
103 | ||
104 | rdev = cfg802154_rdev_by_wpan_phy_idx(wpan_phy_idx); | |
105 | if (!rdev) | |
106 | return NULL; | |
107 | return &rdev->wpan_phy; | |
108 | } | |
109 | ||
a5dd1d72 | 110 | struct wpan_phy * |
f601379f | 111 | wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size) |
2bfb1070 | 112 | { |
53f9ee61 | 113 | static atomic_t wpan_phy_counter = ATOMIC_INIT(0); |
a5dd1d72 AA |
114 | struct cfg802154_registered_device *rdev; |
115 | size_t alloc_size; | |
116 | ||
117 | alloc_size = sizeof(*rdev) + priv_size; | |
118 | rdev = kzalloc(alloc_size, GFP_KERNEL); | |
119 | if (!rdev) | |
120 | return NULL; | |
121 | ||
122 | rdev->ops = ops; | |
2bfb1070 | 123 | |
53f9ee61 AA |
124 | rdev->wpan_phy_idx = atomic_inc_return(&wpan_phy_counter); |
125 | ||
126 | if (unlikely(rdev->wpan_phy_idx < 0)) { | |
127 | /* ugh, wrapped! */ | |
128 | atomic_dec(&wpan_phy_counter); | |
a5dd1d72 | 129 | kfree(rdev); |
53f9ee61 | 130 | return NULL; |
2bfb1070 | 131 | } |
53f9ee61 AA |
132 | |
133 | /* atomic_inc_return makes it start at 1, make it start at 0 */ | |
134 | rdev->wpan_phy_idx--; | |
2bfb1070 | 135 | |
fcf39e6e | 136 | INIT_LIST_HEAD(&rdev->wpan_dev_list); |
a5dd1d72 | 137 | device_initialize(&rdev->wpan_phy.dev); |
c4dd7471 | 138 | dev_set_name(&rdev->wpan_phy.dev, PHY_NAME "%d", rdev->wpan_phy_idx); |
2bfb1070 | 139 | |
a5dd1d72 AA |
140 | rdev->wpan_phy.dev.class = &wpan_phy_class; |
141 | rdev->wpan_phy.dev.platform_data = rdev; | |
2bfb1070 | 142 | |
fcf39e6e AA |
143 | init_waitqueue_head(&rdev->dev_wait); |
144 | ||
a5dd1d72 | 145 | return &rdev->wpan_phy; |
2bfb1070 | 146 | } |
f601379f | 147 | EXPORT_SYMBOL(wpan_phy_new); |
2bfb1070 | 148 | |
e9cf356c | 149 | int wpan_phy_register(struct wpan_phy *phy) |
2bfb1070 | 150 | { |
f3ada640 AA |
151 | struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy); |
152 | int ret; | |
153 | ||
154 | rtnl_lock(); | |
155 | ret = device_add(&phy->dev); | |
156 | if (ret) { | |
157 | rtnl_unlock(); | |
158 | return ret; | |
159 | } | |
160 | ||
161 | list_add_rcu(&rdev->list, &cfg802154_rdev_list); | |
162 | cfg802154_rdev_list_generation++; | |
163 | ||
164 | /* TODO phy registered lock */ | |
165 | rtnl_unlock(); | |
166 | ||
167 | /* TODO nl802154 phy notify */ | |
168 | ||
169 | return 0; | |
2bfb1070 DES |
170 | } |
171 | EXPORT_SYMBOL(wpan_phy_register); | |
172 | ||
173 | void wpan_phy_unregister(struct wpan_phy *phy) | |
174 | { | |
f3ada640 AA |
175 | struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy); |
176 | ||
fcf39e6e AA |
177 | wait_event(rdev->dev_wait, ({ |
178 | int __count; | |
179 | rtnl_lock(); | |
180 | __count = rdev->opencount; | |
181 | rtnl_unlock(); | |
182 | __count == 0; })); | |
f3ada640 AA |
183 | |
184 | rtnl_lock(); | |
185 | /* TODO nl802154 phy notify */ | |
186 | /* TODO phy registered lock */ | |
187 | ||
fcf39e6e | 188 | WARN_ON(!list_empty(&rdev->wpan_dev_list)); |
f3ada640 AA |
189 | |
190 | /* First remove the hardware from everywhere, this makes | |
191 | * it impossible to find from userspace. | |
192 | */ | |
193 | list_del_rcu(&rdev->list); | |
194 | synchronize_rcu(); | |
195 | ||
196 | cfg802154_rdev_list_generation++; | |
197 | ||
2bfb1070 | 198 | device_del(&phy->dev); |
f3ada640 AA |
199 | |
200 | rtnl_unlock(); | |
2bfb1070 DES |
201 | } |
202 | EXPORT_SYMBOL(wpan_phy_unregister); | |
203 | ||
204 | void wpan_phy_free(struct wpan_phy *phy) | |
205 | { | |
206 | put_device(&phy->dev); | |
207 | } | |
208 | EXPORT_SYMBOL(wpan_phy_free); | |
209 | ||
a5dd1d72 AA |
210 | void cfg802154_dev_free(struct cfg802154_registered_device *rdev) |
211 | { | |
212 | kfree(rdev); | |
213 | } | |
214 | ||
fcf39e6e AA |
215 | static void |
216 | cfg802154_update_iface_num(struct cfg802154_registered_device *rdev, | |
217 | int iftype, int num) | |
218 | { | |
219 | ASSERT_RTNL(); | |
220 | ||
221 | rdev->num_running_ifaces += num; | |
222 | } | |
223 | ||
224 | static int cfg802154_netdev_notifier_call(struct notifier_block *nb, | |
225 | unsigned long state, void *ptr) | |
226 | { | |
227 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
228 | struct wpan_dev *wpan_dev = dev->ieee802154_ptr; | |
229 | struct cfg802154_registered_device *rdev; | |
230 | ||
231 | if (!wpan_dev) | |
232 | return NOTIFY_DONE; | |
233 | ||
234 | rdev = wpan_phy_to_rdev(wpan_dev->wpan_phy); | |
235 | ||
236 | /* TODO WARN_ON unspec type */ | |
237 | ||
238 | switch (state) { | |
239 | /* TODO NETDEV_DEVTYPE */ | |
240 | case NETDEV_REGISTER: | |
f9d1ce8f | 241 | dev->features |= NETIF_F_NETNS_LOCAL; |
fcf39e6e AA |
242 | wpan_dev->identifier = ++rdev->wpan_dev_id; |
243 | list_add_rcu(&wpan_dev->list, &rdev->wpan_dev_list); | |
244 | rdev->devlist_generation++; | |
245 | ||
246 | wpan_dev->netdev = dev; | |
247 | break; | |
248 | case NETDEV_DOWN: | |
249 | cfg802154_update_iface_num(rdev, wpan_dev->iftype, -1); | |
250 | ||
251 | rdev->opencount--; | |
252 | wake_up(&rdev->dev_wait); | |
253 | break; | |
254 | case NETDEV_UP: | |
255 | cfg802154_update_iface_num(rdev, wpan_dev->iftype, 1); | |
256 | ||
257 | rdev->opencount++; | |
258 | break; | |
259 | case NETDEV_UNREGISTER: | |
260 | /* It is possible to get NETDEV_UNREGISTER | |
261 | * multiple times. To detect that, check | |
262 | * that the interface is still on the list | |
263 | * of registered interfaces, and only then | |
264 | * remove and clean it up. | |
265 | */ | |
266 | if (!list_empty(&wpan_dev->list)) { | |
267 | list_del_rcu(&wpan_dev->list); | |
268 | rdev->devlist_generation++; | |
269 | } | |
270 | /* synchronize (so that we won't find this netdev | |
271 | * from other code any more) and then clear the list | |
272 | * head so that the above code can safely check for | |
273 | * !list_empty() to avoid double-cleanup. | |
274 | */ | |
275 | synchronize_rcu(); | |
276 | INIT_LIST_HEAD(&wpan_dev->list); | |
277 | break; | |
278 | default: | |
279 | return NOTIFY_DONE; | |
280 | } | |
281 | ||
282 | return NOTIFY_OK; | |
283 | } | |
284 | ||
285 | static struct notifier_block cfg802154_netdev_notifier = { | |
286 | .notifier_call = cfg802154_netdev_notifier_call, | |
287 | }; | |
288 | ||
2bfb1070 DES |
289 | static int __init wpan_phy_class_init(void) |
290 | { | |
cb6b3763 | 291 | int rc; |
4710d806 | 292 | |
e23e9ec1 | 293 | rc = wpan_phy_sysfs_init(); |
cb6b3763 DES |
294 | if (rc) |
295 | goto err; | |
296 | ||
fcf39e6e | 297 | rc = register_netdevice_notifier(&cfg802154_netdev_notifier); |
cb6b3763 DES |
298 | if (rc) |
299 | goto err_nl; | |
300 | ||
fcf39e6e AA |
301 | rc = ieee802154_nl_init(); |
302 | if (rc) | |
303 | goto err_notifier; | |
304 | ||
79fe1a2a AA |
305 | rc = nl802154_init(); |
306 | if (rc) | |
307 | goto err_ieee802154_nl; | |
308 | ||
cb6b3763 | 309 | return 0; |
fcf39e6e | 310 | |
79fe1a2a AA |
311 | err_ieee802154_nl: |
312 | ieee802154_nl_exit(); | |
313 | ||
fcf39e6e AA |
314 | err_notifier: |
315 | unregister_netdevice_notifier(&cfg802154_netdev_notifier); | |
cb6b3763 | 316 | err_nl: |
e23e9ec1 | 317 | wpan_phy_sysfs_exit(); |
cb6b3763 DES |
318 | err: |
319 | return rc; | |
2bfb1070 | 320 | } |
282a3954 | 321 | subsys_initcall(wpan_phy_class_init); |
2bfb1070 DES |
322 | |
323 | static void __exit wpan_phy_class_exit(void) | |
324 | { | |
79fe1a2a | 325 | nl802154_exit(); |
cb6b3763 | 326 | ieee802154_nl_exit(); |
fcf39e6e | 327 | unregister_netdevice_notifier(&cfg802154_netdev_notifier); |
e23e9ec1 | 328 | wpan_phy_sysfs_exit(); |
2bfb1070 DES |
329 | } |
330 | module_exit(wpan_phy_class_exit); | |
331 | ||
2bfb1070 | 332 | MODULE_LICENSE("GPL v2"); |
cb6b3763 DES |
333 | MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface"); |
334 | MODULE_AUTHOR("Dmitry Eremin-Solenikov"); | |
2bfb1070 | 335 |