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 | |
f3ada640 | 28 | /* RCU-protected (and RTNL for writers) */ |
79fe1a2a | 29 | LIST_HEAD(cfg802154_rdev_list); |
ca20ce20 | 30 | int cfg802154_rdev_list_generation; |
f3ada640 | 31 | |
9f3b795a | 32 | static int wpan_phy_match(struct device *dev, const void *data) |
2bfb1070 DES |
33 | { |
34 | return !strcmp(dev_name(dev), (const char *)data); | |
35 | } | |
36 | ||
37 | struct wpan_phy *wpan_phy_find(const char *str) | |
38 | { | |
39 | struct device *dev; | |
40 | ||
41 | if (WARN_ON(!str)) | |
42 | return NULL; | |
43 | ||
9f3b795a | 44 | dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match); |
2bfb1070 DES |
45 | if (!dev) |
46 | return NULL; | |
47 | ||
48 | return container_of(dev, struct wpan_phy, dev); | |
49 | } | |
50 | EXPORT_SYMBOL(wpan_phy_find); | |
51 | ||
1c889f4d DES |
52 | struct wpan_phy_iter_data { |
53 | int (*fn)(struct wpan_phy *phy, void *data); | |
54 | void *data; | |
55 | }; | |
56 | ||
57 | static int wpan_phy_iter(struct device *dev, void *_data) | |
58 | { | |
59 | struct wpan_phy_iter_data *wpid = _data; | |
60 | struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); | |
4710d806 | 61 | |
1c889f4d DES |
62 | return wpid->fn(phy, wpid->data); |
63 | } | |
64 | ||
65 | int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data), | |
4710d806 | 66 | void *data) |
1c889f4d DES |
67 | { |
68 | struct wpan_phy_iter_data wpid = { | |
69 | .fn = fn, | |
70 | .data = data, | |
71 | }; | |
72 | ||
73 | return class_for_each_device(&wpan_phy_class, NULL, | |
74 | &wpid, wpan_phy_iter); | |
75 | } | |
76 | EXPORT_SYMBOL(wpan_phy_for_each); | |
77 | ||
79fe1a2a AA |
78 | struct cfg802154_registered_device * |
79 | cfg802154_rdev_by_wpan_phy_idx(int wpan_phy_idx) | |
80 | { | |
81 | struct cfg802154_registered_device *result = NULL, *rdev; | |
82 | ||
83 | ASSERT_RTNL(); | |
84 | ||
85 | list_for_each_entry(rdev, &cfg802154_rdev_list, list) { | |
86 | if (rdev->wpan_phy_idx == wpan_phy_idx) { | |
87 | result = rdev; | |
88 | break; | |
89 | } | |
90 | } | |
91 | ||
92 | return result; | |
93 | } | |
94 | ||
a5dd1d72 | 95 | struct wpan_phy * |
f601379f | 96 | wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size) |
2bfb1070 | 97 | { |
53f9ee61 | 98 | static atomic_t wpan_phy_counter = ATOMIC_INIT(0); |
a5dd1d72 AA |
99 | struct cfg802154_registered_device *rdev; |
100 | size_t alloc_size; | |
101 | ||
102 | alloc_size = sizeof(*rdev) + priv_size; | |
103 | rdev = kzalloc(alloc_size, GFP_KERNEL); | |
104 | if (!rdev) | |
105 | return NULL; | |
106 | ||
107 | rdev->ops = ops; | |
2bfb1070 | 108 | |
53f9ee61 AA |
109 | rdev->wpan_phy_idx = atomic_inc_return(&wpan_phy_counter); |
110 | ||
111 | if (unlikely(rdev->wpan_phy_idx < 0)) { | |
112 | /* ugh, wrapped! */ | |
113 | atomic_dec(&wpan_phy_counter); | |
a5dd1d72 | 114 | kfree(rdev); |
53f9ee61 | 115 | return NULL; |
2bfb1070 | 116 | } |
53f9ee61 AA |
117 | |
118 | /* atomic_inc_return makes it start at 1, make it start at 0 */ | |
119 | rdev->wpan_phy_idx--; | |
2bfb1070 | 120 | |
a5dd1d72 | 121 | mutex_init(&rdev->wpan_phy.pib_lock); |
2bfb1070 | 122 | |
fcf39e6e | 123 | INIT_LIST_HEAD(&rdev->wpan_dev_list); |
a5dd1d72 | 124 | device_initialize(&rdev->wpan_phy.dev); |
53f9ee61 | 125 | dev_set_name(&rdev->wpan_phy.dev, "wpan-phy%d", rdev->wpan_phy_idx); |
2bfb1070 | 126 | |
a5dd1d72 AA |
127 | rdev->wpan_phy.dev.class = &wpan_phy_class; |
128 | rdev->wpan_phy.dev.platform_data = rdev; | |
2bfb1070 | 129 | |
fcf39e6e AA |
130 | init_waitqueue_head(&rdev->dev_wait); |
131 | ||
a5dd1d72 | 132 | return &rdev->wpan_phy; |
2bfb1070 | 133 | } |
f601379f | 134 | EXPORT_SYMBOL(wpan_phy_new); |
2bfb1070 | 135 | |
e9cf356c | 136 | int wpan_phy_register(struct wpan_phy *phy) |
2bfb1070 | 137 | { |
f3ada640 AA |
138 | struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy); |
139 | int ret; | |
140 | ||
141 | rtnl_lock(); | |
142 | ret = device_add(&phy->dev); | |
143 | if (ret) { | |
144 | rtnl_unlock(); | |
145 | return ret; | |
146 | } | |
147 | ||
148 | list_add_rcu(&rdev->list, &cfg802154_rdev_list); | |
149 | cfg802154_rdev_list_generation++; | |
150 | ||
151 | /* TODO phy registered lock */ | |
152 | rtnl_unlock(); | |
153 | ||
154 | /* TODO nl802154 phy notify */ | |
155 | ||
156 | return 0; | |
2bfb1070 DES |
157 | } |
158 | EXPORT_SYMBOL(wpan_phy_register); | |
159 | ||
160 | void wpan_phy_unregister(struct wpan_phy *phy) | |
161 | { | |
f3ada640 AA |
162 | struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy); |
163 | ||
fcf39e6e AA |
164 | wait_event(rdev->dev_wait, ({ |
165 | int __count; | |
166 | rtnl_lock(); | |
167 | __count = rdev->opencount; | |
168 | rtnl_unlock(); | |
169 | __count == 0; })); | |
f3ada640 AA |
170 | |
171 | rtnl_lock(); | |
172 | /* TODO nl802154 phy notify */ | |
173 | /* TODO phy registered lock */ | |
174 | ||
fcf39e6e | 175 | WARN_ON(!list_empty(&rdev->wpan_dev_list)); |
f3ada640 AA |
176 | |
177 | /* First remove the hardware from everywhere, this makes | |
178 | * it impossible to find from userspace. | |
179 | */ | |
180 | list_del_rcu(&rdev->list); | |
181 | synchronize_rcu(); | |
182 | ||
183 | cfg802154_rdev_list_generation++; | |
184 | ||
2bfb1070 | 185 | device_del(&phy->dev); |
f3ada640 AA |
186 | |
187 | rtnl_unlock(); | |
2bfb1070 DES |
188 | } |
189 | EXPORT_SYMBOL(wpan_phy_unregister); | |
190 | ||
191 | void wpan_phy_free(struct wpan_phy *phy) | |
192 | { | |
193 | put_device(&phy->dev); | |
194 | } | |
195 | EXPORT_SYMBOL(wpan_phy_free); | |
196 | ||
a5dd1d72 AA |
197 | void cfg802154_dev_free(struct cfg802154_registered_device *rdev) |
198 | { | |
199 | kfree(rdev); | |
200 | } | |
201 | ||
fcf39e6e AA |
202 | static void |
203 | cfg802154_update_iface_num(struct cfg802154_registered_device *rdev, | |
204 | int iftype, int num) | |
205 | { | |
206 | ASSERT_RTNL(); | |
207 | ||
208 | rdev->num_running_ifaces += num; | |
209 | } | |
210 | ||
211 | static int cfg802154_netdev_notifier_call(struct notifier_block *nb, | |
212 | unsigned long state, void *ptr) | |
213 | { | |
214 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
215 | struct wpan_dev *wpan_dev = dev->ieee802154_ptr; | |
216 | struct cfg802154_registered_device *rdev; | |
217 | ||
218 | if (!wpan_dev) | |
219 | return NOTIFY_DONE; | |
220 | ||
221 | rdev = wpan_phy_to_rdev(wpan_dev->wpan_phy); | |
222 | ||
223 | /* TODO WARN_ON unspec type */ | |
224 | ||
225 | switch (state) { | |
226 | /* TODO NETDEV_DEVTYPE */ | |
227 | case NETDEV_REGISTER: | |
228 | wpan_dev->identifier = ++rdev->wpan_dev_id; | |
229 | list_add_rcu(&wpan_dev->list, &rdev->wpan_dev_list); | |
230 | rdev->devlist_generation++; | |
231 | ||
232 | wpan_dev->netdev = dev; | |
233 | break; | |
234 | case NETDEV_DOWN: | |
235 | cfg802154_update_iface_num(rdev, wpan_dev->iftype, -1); | |
236 | ||
237 | rdev->opencount--; | |
238 | wake_up(&rdev->dev_wait); | |
239 | break; | |
240 | case NETDEV_UP: | |
241 | cfg802154_update_iface_num(rdev, wpan_dev->iftype, 1); | |
242 | ||
243 | rdev->opencount++; | |
244 | break; | |
245 | case NETDEV_UNREGISTER: | |
246 | /* It is possible to get NETDEV_UNREGISTER | |
247 | * multiple times. To detect that, check | |
248 | * that the interface is still on the list | |
249 | * of registered interfaces, and only then | |
250 | * remove and clean it up. | |
251 | */ | |
252 | if (!list_empty(&wpan_dev->list)) { | |
253 | list_del_rcu(&wpan_dev->list); | |
254 | rdev->devlist_generation++; | |
255 | } | |
256 | /* synchronize (so that we won't find this netdev | |
257 | * from other code any more) and then clear the list | |
258 | * head so that the above code can safely check for | |
259 | * !list_empty() to avoid double-cleanup. | |
260 | */ | |
261 | synchronize_rcu(); | |
262 | INIT_LIST_HEAD(&wpan_dev->list); | |
263 | break; | |
264 | default: | |
265 | return NOTIFY_DONE; | |
266 | } | |
267 | ||
268 | return NOTIFY_OK; | |
269 | } | |
270 | ||
271 | static struct notifier_block cfg802154_netdev_notifier = { | |
272 | .notifier_call = cfg802154_netdev_notifier_call, | |
273 | }; | |
274 | ||
2bfb1070 DES |
275 | static int __init wpan_phy_class_init(void) |
276 | { | |
cb6b3763 | 277 | int rc; |
4710d806 | 278 | |
e23e9ec1 | 279 | rc = wpan_phy_sysfs_init(); |
cb6b3763 DES |
280 | if (rc) |
281 | goto err; | |
282 | ||
fcf39e6e | 283 | rc = register_netdevice_notifier(&cfg802154_netdev_notifier); |
cb6b3763 DES |
284 | if (rc) |
285 | goto err_nl; | |
286 | ||
fcf39e6e AA |
287 | rc = ieee802154_nl_init(); |
288 | if (rc) | |
289 | goto err_notifier; | |
290 | ||
79fe1a2a AA |
291 | rc = nl802154_init(); |
292 | if (rc) | |
293 | goto err_ieee802154_nl; | |
294 | ||
cb6b3763 | 295 | return 0; |
fcf39e6e | 296 | |
79fe1a2a AA |
297 | err_ieee802154_nl: |
298 | ieee802154_nl_exit(); | |
299 | ||
fcf39e6e AA |
300 | err_notifier: |
301 | unregister_netdevice_notifier(&cfg802154_netdev_notifier); | |
cb6b3763 | 302 | err_nl: |
e23e9ec1 | 303 | wpan_phy_sysfs_exit(); |
cb6b3763 DES |
304 | err: |
305 | return rc; | |
2bfb1070 | 306 | } |
282a3954 | 307 | subsys_initcall(wpan_phy_class_init); |
2bfb1070 DES |
308 | |
309 | static void __exit wpan_phy_class_exit(void) | |
310 | { | |
79fe1a2a | 311 | nl802154_exit(); |
cb6b3763 | 312 | ieee802154_nl_exit(); |
fcf39e6e | 313 | unregister_netdevice_notifier(&cfg802154_netdev_notifier); |
e23e9ec1 | 314 | wpan_phy_sysfs_exit(); |
2bfb1070 DES |
315 | } |
316 | module_exit(wpan_phy_class_exit); | |
317 | ||
2bfb1070 | 318 | MODULE_LICENSE("GPL v2"); |
cb6b3763 DES |
319 | MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface"); |
320 | MODULE_AUTHOR("Dmitry Eremin-Solenikov"); | |
2bfb1070 | 321 |