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1 | /* |
2 | * Copyright (C) 2006 Ivo van Doorn | |
3 | * Copyright (C) 2007 Dmitry Torokhov | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the | |
17 | * Free Software Foundation, Inc., | |
18 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/workqueue.h> | |
25 | #include <linux/capability.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/mutex.h> | |
28 | #include <linux/rfkill.h> | |
29 | ||
30 | MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>"); | |
31 | MODULE_VERSION("1.0"); | |
32 | MODULE_DESCRIPTION("RF switch support"); | |
33 | MODULE_LICENSE("GPL"); | |
34 | ||
35 | static LIST_HEAD(rfkill_list); /* list of registered rf switches */ | |
36 | static DEFINE_MUTEX(rfkill_mutex); | |
37 | ||
38 | static enum rfkill_state rfkill_states[RFKILL_TYPE_MAX]; | |
39 | ||
40 | static int rfkill_toggle_radio(struct rfkill *rfkill, | |
41 | enum rfkill_state state) | |
42 | { | |
43 | int retval; | |
44 | ||
45 | retval = mutex_lock_interruptible(&rfkill->mutex); | |
46 | if (retval) | |
47 | return retval; | |
48 | ||
49 | if (state != rfkill->state) { | |
50 | retval = rfkill->toggle_radio(rfkill->data, state); | |
51 | if (!retval) | |
52 | rfkill->state = state; | |
53 | } | |
54 | ||
55 | mutex_unlock(&rfkill->mutex); | |
56 | return retval; | |
57 | } | |
58 | ||
59 | /** | |
60 | * rfkill_switch_all - Toggle state of all switches of given type | |
61 | * @type: type of interfaces to be affeceted | |
62 | * @state: the new state | |
63 | * | |
64 | * This function toggles state of all switches of given type unless | |
65 | * a specific switch is claimed by userspace in which case it is | |
66 | * left alone. | |
67 | */ | |
68 | ||
69 | void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state) | |
70 | { | |
71 | struct rfkill *rfkill; | |
72 | ||
73 | mutex_lock(&rfkill_mutex); | |
74 | ||
75 | rfkill_states[type] = state; | |
76 | ||
77 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
78 | if (!rfkill->user_claim) | |
79 | rfkill_toggle_radio(rfkill, state); | |
80 | } | |
81 | ||
82 | mutex_unlock(&rfkill_mutex); | |
83 | } | |
84 | EXPORT_SYMBOL(rfkill_switch_all); | |
85 | ||
86 | static ssize_t rfkill_name_show(struct device *dev, | |
87 | struct device_attribute *attr, | |
88 | char *buf) | |
89 | { | |
90 | struct rfkill *rfkill = to_rfkill(dev); | |
91 | ||
92 | return sprintf(buf, "%s\n", rfkill->name); | |
93 | } | |
94 | ||
95 | static ssize_t rfkill_type_show(struct device *dev, | |
96 | struct device_attribute *attr, | |
97 | char *buf) | |
98 | { | |
99 | struct rfkill *rfkill = to_rfkill(dev); | |
100 | const char *type; | |
101 | ||
102 | switch (rfkill->type) { | |
103 | case RFKILL_TYPE_WLAN: | |
104 | type = "wlan"; | |
105 | break; | |
106 | case RFKILL_TYPE_BLUETOOTH: | |
107 | type = "bluetooth"; | |
108 | break; | |
109 | case RFKILL_TYPE_IRDA: | |
110 | type = "irda"; | |
111 | break; | |
112 | default: | |
113 | BUG(); | |
114 | } | |
115 | ||
116 | return sprintf(buf, "%s\n", type); | |
117 | } | |
118 | ||
119 | static ssize_t rfkill_state_show(struct device *dev, | |
120 | struct device_attribute *attr, | |
121 | char *buf) | |
122 | { | |
123 | struct rfkill *rfkill = to_rfkill(dev); | |
124 | ||
125 | return sprintf(buf, "%d\n", rfkill->state); | |
126 | } | |
127 | ||
128 | static ssize_t rfkill_state_store(struct device *dev, | |
129 | struct device_attribute *attr, | |
130 | const char *buf, size_t count) | |
131 | { | |
132 | struct rfkill *rfkill = to_rfkill(dev); | |
133 | unsigned int state = simple_strtoul(buf, NULL, 0); | |
134 | int error; | |
135 | ||
136 | if (!capable(CAP_NET_ADMIN)) | |
137 | return -EPERM; | |
138 | ||
139 | error = rfkill_toggle_radio(rfkill, | |
140 | state ? RFKILL_STATE_ON : RFKILL_STATE_OFF); | |
141 | if (error) | |
142 | return error; | |
143 | ||
144 | return count; | |
145 | } | |
146 | ||
147 | static ssize_t rfkill_claim_show(struct device *dev, | |
148 | struct device_attribute *attr, | |
149 | char *buf) | |
150 | { | |
151 | struct rfkill *rfkill = to_rfkill(dev); | |
152 | ||
153 | return sprintf(buf, "%d", rfkill->user_claim); | |
154 | } | |
155 | ||
156 | static ssize_t rfkill_claim_store(struct device *dev, | |
157 | struct device_attribute *attr, | |
158 | const char *buf, size_t count) | |
159 | { | |
160 | struct rfkill *rfkill = to_rfkill(dev); | |
161 | bool claim = !!simple_strtoul(buf, NULL, 0); | |
162 | int error; | |
163 | ||
164 | if (!capable(CAP_NET_ADMIN)) | |
165 | return -EPERM; | |
166 | ||
167 | /* | |
168 | * Take the global lock to make sure the kernel is not in | |
169 | * the middle of rfkill_switch_all | |
170 | */ | |
171 | error = mutex_lock_interruptible(&rfkill_mutex); | |
172 | if (error) | |
173 | return error; | |
174 | ||
175 | if (rfkill->user_claim != claim) { | |
176 | if (!claim) | |
177 | rfkill_toggle_radio(rfkill, | |
178 | rfkill_states[rfkill->type]); | |
179 | rfkill->user_claim = claim; | |
180 | } | |
181 | ||
182 | mutex_unlock(&rfkill_mutex); | |
183 | ||
184 | return count; | |
185 | } | |
186 | ||
187 | static struct device_attribute rfkill_dev_attrs[] = { | |
188 | __ATTR(name, S_IRUGO, rfkill_name_show, NULL), | |
189 | __ATTR(type, S_IRUGO, rfkill_type_show, NULL), | |
190 | __ATTR(state, S_IRUGO, rfkill_state_show, rfkill_state_store), | |
191 | __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store), | |
192 | __ATTR_NULL | |
193 | }; | |
194 | ||
195 | static void rfkill_release(struct device *dev) | |
196 | { | |
197 | struct rfkill *rfkill = to_rfkill(dev); | |
198 | ||
199 | kfree(rfkill); | |
200 | module_put(THIS_MODULE); | |
201 | } | |
202 | ||
203 | #ifdef CONFIG_PM | |
204 | static int rfkill_suspend(struct device *dev, pm_message_t state) | |
205 | { | |
206 | struct rfkill *rfkill = to_rfkill(dev); | |
207 | ||
208 | if (dev->power.power_state.event != state.event) { | |
209 | if (state.event == PM_EVENT_SUSPEND) { | |
210 | mutex_lock(&rfkill->mutex); | |
211 | ||
212 | if (rfkill->state == RFKILL_STATE_ON) | |
213 | rfkill->toggle_radio(rfkill->data, | |
214 | RFKILL_STATE_OFF); | |
215 | ||
216 | mutex_unlock(&rfkill->mutex); | |
217 | } | |
218 | ||
219 | dev->power.power_state = state; | |
220 | } | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | static int rfkill_resume(struct device *dev) | |
226 | { | |
227 | struct rfkill *rfkill = to_rfkill(dev); | |
228 | ||
229 | if (dev->power.power_state.event != PM_EVENT_ON) { | |
230 | mutex_lock(&rfkill->mutex); | |
231 | ||
232 | if (rfkill->state == RFKILL_STATE_ON) | |
233 | rfkill->toggle_radio(rfkill->data, RFKILL_STATE_ON); | |
234 | ||
235 | mutex_unlock(&rfkill->mutex); | |
236 | } | |
237 | ||
238 | dev->power.power_state = PMSG_ON; | |
239 | return 0; | |
240 | } | |
241 | #else | |
242 | #define rfkill_suspend NULL | |
243 | #define rfkill_resume NULL | |
244 | #endif | |
245 | ||
246 | static struct class rfkill_class = { | |
247 | .name = "rfkill", | |
248 | .dev_release = rfkill_release, | |
249 | .dev_attrs = rfkill_dev_attrs, | |
250 | .suspend = rfkill_suspend, | |
251 | .resume = rfkill_resume, | |
252 | }; | |
253 | ||
254 | static int rfkill_add_switch(struct rfkill *rfkill) | |
255 | { | |
256 | int retval; | |
257 | ||
258 | retval = mutex_lock_interruptible(&rfkill_mutex); | |
259 | if (retval) | |
260 | return retval; | |
261 | ||
262 | retval = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]); | |
263 | if (retval) | |
264 | goto out; | |
265 | ||
266 | list_add_tail(&rfkill->node, &rfkill_list); | |
267 | ||
268 | out: | |
269 | mutex_unlock(&rfkill_mutex); | |
270 | return retval; | |
271 | } | |
272 | ||
273 | static void rfkill_remove_switch(struct rfkill *rfkill) | |
274 | { | |
275 | mutex_lock(&rfkill_mutex); | |
276 | list_del_init(&rfkill->node); | |
277 | rfkill_toggle_radio(rfkill, RFKILL_STATE_OFF); | |
278 | mutex_unlock(&rfkill_mutex); | |
279 | } | |
280 | ||
281 | /** | |
282 | * rfkill_allocate - allocate memory for rfkill structure. | |
283 | * @parent: device that has rf switch on it | |
284 | * @type: type of the switch (wlan, bluetooth, irda) | |
285 | * | |
286 | * This function should be called by the network driver when it needs | |
287 | * rfkill structure. Once the structure is allocated the driver shoud | |
288 | * finish its initialization by setting name, private data, enable_radio | |
289 | * and disable_radio methods and then register it with rfkill_register(). | |
290 | * NOTE: If registration fails the structure shoudl be freed by calling | |
291 | * rfkill_free() otherwise rfkill_unregister() should be used. | |
292 | */ | |
293 | struct rfkill *rfkill_allocate(struct device *parent, enum rfkill_type type) | |
294 | { | |
295 | struct rfkill *rfkill; | |
296 | struct device *dev; | |
297 | ||
298 | rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL); | |
299 | if (rfkill) | |
300 | return NULL; | |
301 | ||
302 | mutex_init(&rfkill->mutex); | |
303 | INIT_LIST_HEAD(&rfkill->node); | |
304 | rfkill->type = type; | |
305 | ||
306 | dev = &rfkill->dev; | |
307 | dev->class = &rfkill_class; | |
308 | dev->parent = parent; | |
309 | device_initialize(dev); | |
310 | ||
311 | __module_get(THIS_MODULE); | |
312 | ||
313 | return rfkill; | |
314 | } | |
315 | EXPORT_SYMBOL(rfkill_allocate); | |
316 | ||
317 | /** | |
318 | * rfkill_free - Mark rfkill structure for deletion | |
319 | * @rfkill: rfkill structure to be destroyed | |
320 | * | |
321 | * Decrements reference count of rfkill structure so it is destoryed. | |
322 | * Note that rfkill_free() should _not_ be called after rfkill_unregister(). | |
323 | */ | |
324 | void rfkill_free(struct rfkill *rfkill) | |
325 | { | |
326 | if (rfkill) | |
327 | put_device(&rfkill->dev); | |
328 | } | |
329 | EXPORT_SYMBOL(rfkill_free); | |
330 | ||
331 | /** | |
332 | * rfkill_register - Register a rfkill structure. | |
333 | * @rfkill: rfkill structure to be registered | |
334 | * | |
335 | * This function should be called by the network driver when the rfkill | |
336 | * structure needs to be registered. Immediately from registration the | |
337 | * switch driver should be able to service calls to toggle_radio. | |
338 | */ | |
339 | int rfkill_register(struct rfkill *rfkill) | |
340 | { | |
341 | static atomic_t rfkill_no = ATOMIC_INIT(0); | |
342 | struct device *dev = &rfkill->dev; | |
343 | int error; | |
344 | ||
345 | if (!rfkill->toggle_radio) | |
346 | return -EINVAL; | |
347 | ||
348 | error = rfkill_add_switch(rfkill); | |
349 | if (error) | |
350 | return error; | |
351 | ||
352 | snprintf(dev->bus_id, sizeof(dev->bus_id), | |
353 | "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1); | |
354 | ||
355 | error = device_add(dev); | |
356 | if (error) { | |
357 | rfkill_remove_switch(rfkill); | |
358 | return error; | |
359 | } | |
360 | ||
361 | return 0; | |
362 | } | |
363 | EXPORT_SYMBOL(rfkill_register); | |
364 | ||
365 | /** | |
366 | * rfkill_unregister - Uegister a rfkill structure. | |
367 | * @rfkill: rfkill structure to be unregistered | |
368 | * | |
369 | * This function should be called by the network driver during device | |
370 | * teardown to destroy rfkill structure. Note that rfkill_free() should | |
371 | * _not_ be called after rfkill_unregister(). | |
372 | */ | |
373 | void rfkill_unregister(struct rfkill *rfkill) | |
374 | { | |
375 | device_del(&rfkill->dev); | |
376 | rfkill_remove_switch(rfkill); | |
377 | put_device(&rfkill->dev); | |
378 | } | |
379 | EXPORT_SYMBOL(rfkill_unregister); | |
380 | ||
381 | /* | |
382 | * Rfkill module initialization/deinitialization. | |
383 | */ | |
384 | static int __init rfkill_init(void) | |
385 | { | |
386 | int error; | |
387 | int i; | |
388 | ||
389 | for (i = 0; i < ARRAY_SIZE(rfkill_states); i++) | |
390 | rfkill_states[i] = RFKILL_STATE_ON; | |
391 | ||
392 | error = class_register(&rfkill_class); | |
393 | if (error) { | |
394 | printk(KERN_ERR "rfkill: unable to register rfkill class\n"); | |
395 | return error; | |
396 | } | |
397 | ||
398 | return 0; | |
399 | } | |
400 | ||
401 | static void __exit rfkill_exit(void) | |
402 | { | |
403 | class_unregister(&rfkill_class); | |
404 | } | |
405 | ||
406 | module_init(rfkill_init); | |
407 | module_exit(rfkill_exit); |