diff options
author | Ivo van Doorn <IvDoorn@gmail.com> | 2007-05-07 03:34:20 -0400 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2007-05-07 03:34:20 -0400 |
commit | cf4328cd949c2086091c62c5685f1580fe9b55e4 (patch) | |
tree | bd9d96f1c99910076b6f5f34cd5cd2da30405ef1 /net/rfkill/rfkill.c | |
parent | 2396a22e0989df6038996506bfbf7a57f116c299 (diff) |
[NET]: rfkill: add support for input key to control wireless radio
The RF kill patch that provides infrastructure for implementing
switches controlling radio states on various network and other cards.
[dtor@insightbb.com: address review comments]
[akpm@linux-foundation.org: cleanups, build fixes]
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rfkill/rfkill.c')
-rw-r--r-- | net/rfkill/rfkill.c | 407 |
1 files changed, 407 insertions, 0 deletions
diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c new file mode 100644 index 000000000000..a973603e3880 --- /dev/null +++ b/net/rfkill/rfkill.c | |||
@@ -0,0 +1,407 @@ | |||
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); | ||