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cf4328cd | 1 | /* |
fe242cfd | 2 | * Copyright (C) 2006 - 2007 Ivo van Doorn |
cf4328cd ID |
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 | ||
135900c1 MB |
40 | |
41 | static void rfkill_led_trigger(struct rfkill *rfkill, | |
42 | enum rfkill_state state) | |
43 | { | |
44 | #ifdef CONFIG_RFKILL_LEDS | |
45 | struct led_trigger *led = &rfkill->led_trigger; | |
46 | ||
47 | if (!led->name) | |
48 | return; | |
49 | if (state == RFKILL_STATE_OFF) | |
50 | led_trigger_event(led, LED_OFF); | |
51 | else | |
52 | led_trigger_event(led, LED_FULL); | |
53 | #endif /* CONFIG_RFKILL_LEDS */ | |
54 | } | |
55 | ||
cf4328cd ID |
56 | static int rfkill_toggle_radio(struct rfkill *rfkill, |
57 | enum rfkill_state state) | |
58 | { | |
59 | int retval; | |
60 | ||
61 | retval = mutex_lock_interruptible(&rfkill->mutex); | |
62 | if (retval) | |
63 | return retval; | |
64 | ||
65 | if (state != rfkill->state) { | |
66 | retval = rfkill->toggle_radio(rfkill->data, state); | |
135900c1 | 67 | if (!retval) { |
cf4328cd | 68 | rfkill->state = state; |
135900c1 MB |
69 | rfkill_led_trigger(rfkill, state); |
70 | } | |
cf4328cd ID |
71 | } |
72 | ||
73 | mutex_unlock(&rfkill->mutex); | |
74 | return retval; | |
75 | } | |
76 | ||
77 | /** | |
78 | * rfkill_switch_all - Toggle state of all switches of given type | |
79 | * @type: type of interfaces to be affeceted | |
80 | * @state: the new state | |
81 | * | |
82 | * This function toggles state of all switches of given type unless | |
83 | * a specific switch is claimed by userspace in which case it is | |
84 | * left alone. | |
85 | */ | |
86 | ||
87 | void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state) | |
88 | { | |
89 | struct rfkill *rfkill; | |
90 | ||
91 | mutex_lock(&rfkill_mutex); | |
92 | ||
93 | rfkill_states[type] = state; | |
94 | ||
95 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
96 | if (!rfkill->user_claim) | |
97 | rfkill_toggle_radio(rfkill, state); | |
98 | } | |
99 | ||
100 | mutex_unlock(&rfkill_mutex); | |
101 | } | |
102 | EXPORT_SYMBOL(rfkill_switch_all); | |
103 | ||
104 | static ssize_t rfkill_name_show(struct device *dev, | |
105 | struct device_attribute *attr, | |
106 | char *buf) | |
107 | { | |
108 | struct rfkill *rfkill = to_rfkill(dev); | |
109 | ||
110 | return sprintf(buf, "%s\n", rfkill->name); | |
111 | } | |
112 | ||
113 | static ssize_t rfkill_type_show(struct device *dev, | |
114 | struct device_attribute *attr, | |
115 | char *buf) | |
116 | { | |
117 | struct rfkill *rfkill = to_rfkill(dev); | |
118 | const char *type; | |
119 | ||
120 | switch (rfkill->type) { | |
121 | case RFKILL_TYPE_WLAN: | |
122 | type = "wlan"; | |
123 | break; | |
124 | case RFKILL_TYPE_BLUETOOTH: | |
125 | type = "bluetooth"; | |
126 | break; | |
e0665486 ID |
127 | case RFKILL_TYPE_UWB: |
128 | type = "ultrawideband"; | |
129 | break; | |
cf4328cd ID |
130 | default: |
131 | BUG(); | |
132 | } | |
133 | ||
134 | return sprintf(buf, "%s\n", type); | |
135 | } | |
136 | ||
137 | static ssize_t rfkill_state_show(struct device *dev, | |
138 | struct device_attribute *attr, | |
139 | char *buf) | |
140 | { | |
141 | struct rfkill *rfkill = to_rfkill(dev); | |
142 | ||
143 | return sprintf(buf, "%d\n", rfkill->state); | |
144 | } | |
145 | ||
146 | static ssize_t rfkill_state_store(struct device *dev, | |
147 | struct device_attribute *attr, | |
148 | const char *buf, size_t count) | |
149 | { | |
150 | struct rfkill *rfkill = to_rfkill(dev); | |
151 | unsigned int state = simple_strtoul(buf, NULL, 0); | |
152 | int error; | |
153 | ||
154 | if (!capable(CAP_NET_ADMIN)) | |
155 | return -EPERM; | |
156 | ||
157 | error = rfkill_toggle_radio(rfkill, | |
158 | state ? RFKILL_STATE_ON : RFKILL_STATE_OFF); | |
159 | if (error) | |
160 | return error; | |
161 | ||
162 | return count; | |
163 | } | |
164 | ||
165 | static ssize_t rfkill_claim_show(struct device *dev, | |
166 | struct device_attribute *attr, | |
167 | char *buf) | |
168 | { | |
169 | struct rfkill *rfkill = to_rfkill(dev); | |
170 | ||
171 | return sprintf(buf, "%d", rfkill->user_claim); | |
172 | } | |
173 | ||
174 | static ssize_t rfkill_claim_store(struct device *dev, | |
175 | struct device_attribute *attr, | |
176 | const char *buf, size_t count) | |
177 | { | |
178 | struct rfkill *rfkill = to_rfkill(dev); | |
179 | bool claim = !!simple_strtoul(buf, NULL, 0); | |
180 | int error; | |
181 | ||
182 | if (!capable(CAP_NET_ADMIN)) | |
183 | return -EPERM; | |
184 | ||
185 | /* | |
186 | * Take the global lock to make sure the kernel is not in | |
187 | * the middle of rfkill_switch_all | |
188 | */ | |
189 | error = mutex_lock_interruptible(&rfkill_mutex); | |
190 | if (error) | |
191 | return error; | |
192 | ||
20405c08 MB |
193 | if (rfkill->user_claim_unsupported) { |
194 | error = -EOPNOTSUPP; | |
195 | goto out_unlock; | |
196 | } | |
cf4328cd ID |
197 | if (rfkill->user_claim != claim) { |
198 | if (!claim) | |
199 | rfkill_toggle_radio(rfkill, | |
200 | rfkill_states[rfkill->type]); | |
201 | rfkill->user_claim = claim; | |
202 | } | |
203 | ||
20405c08 | 204 | out_unlock: |
cf4328cd ID |
205 | mutex_unlock(&rfkill_mutex); |
206 | ||
20405c08 | 207 | return error ? error : count; |
cf4328cd ID |
208 | } |
209 | ||
210 | static struct device_attribute rfkill_dev_attrs[] = { | |
211 | __ATTR(name, S_IRUGO, rfkill_name_show, NULL), | |
212 | __ATTR(type, S_IRUGO, rfkill_type_show, NULL), | |
c81de6ad | 213 | __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store), |
cf4328cd ID |
214 | __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store), |
215 | __ATTR_NULL | |
216 | }; | |
217 | ||
218 | static void rfkill_release(struct device *dev) | |
219 | { | |
220 | struct rfkill *rfkill = to_rfkill(dev); | |
221 | ||
222 | kfree(rfkill); | |
223 | module_put(THIS_MODULE); | |
224 | } | |
225 | ||
226 | #ifdef CONFIG_PM | |
227 | static int rfkill_suspend(struct device *dev, pm_message_t state) | |
228 | { | |
229 | struct rfkill *rfkill = to_rfkill(dev); | |
230 | ||
231 | if (dev->power.power_state.event != state.event) { | |
232 | if (state.event == PM_EVENT_SUSPEND) { | |
233 | mutex_lock(&rfkill->mutex); | |
234 | ||
235 | if (rfkill->state == RFKILL_STATE_ON) | |
236 | rfkill->toggle_radio(rfkill->data, | |
237 | RFKILL_STATE_OFF); | |
238 | ||
239 | mutex_unlock(&rfkill->mutex); | |
240 | } | |
241 | ||
242 | dev->power.power_state = state; | |
243 | } | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | static int rfkill_resume(struct device *dev) | |
249 | { | |
250 | struct rfkill *rfkill = to_rfkill(dev); | |
251 | ||
252 | if (dev->power.power_state.event != PM_EVENT_ON) { | |
253 | mutex_lock(&rfkill->mutex); | |
254 | ||
255 | if (rfkill->state == RFKILL_STATE_ON) | |
256 | rfkill->toggle_radio(rfkill->data, RFKILL_STATE_ON); | |
257 | ||
258 | mutex_unlock(&rfkill->mutex); | |
259 | } | |
260 | ||
261 | dev->power.power_state = PMSG_ON; | |
262 | return 0; | |
263 | } | |
264 | #else | |
265 | #define rfkill_suspend NULL | |
266 | #define rfkill_resume NULL | |
267 | #endif | |
268 | ||
269 | static struct class rfkill_class = { | |
270 | .name = "rfkill", | |
271 | .dev_release = rfkill_release, | |
272 | .dev_attrs = rfkill_dev_attrs, | |
273 | .suspend = rfkill_suspend, | |
274 | .resume = rfkill_resume, | |
275 | }; | |
276 | ||
277 | static int rfkill_add_switch(struct rfkill *rfkill) | |
278 | { | |
7319f1e6 | 279 | int error; |
cf4328cd | 280 | |
7319f1e6 | 281 | mutex_lock(&rfkill_mutex); |
cf4328cd | 282 | |
7319f1e6 MB |
283 | error = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]); |
284 | if (!error) | |
285 | list_add_tail(&rfkill->node, &rfkill_list); | |
cf4328cd | 286 | |
cf4328cd | 287 | mutex_unlock(&rfkill_mutex); |
7319f1e6 MB |
288 | |
289 | return error; | |
cf4328cd ID |
290 | } |
291 | ||
292 | static void rfkill_remove_switch(struct rfkill *rfkill) | |
293 | { | |
294 | mutex_lock(&rfkill_mutex); | |
295 | list_del_init(&rfkill->node); | |
296 | rfkill_toggle_radio(rfkill, RFKILL_STATE_OFF); | |
297 | mutex_unlock(&rfkill_mutex); | |
298 | } | |
299 | ||
300 | /** | |
301 | * rfkill_allocate - allocate memory for rfkill structure. | |
302 | * @parent: device that has rf switch on it | |
234a0ca6 | 303 | * @type: type of the switch (RFKILL_TYPE_*) |
cf4328cd ID |
304 | * |
305 | * This function should be called by the network driver when it needs | |
306 | * rfkill structure. Once the structure is allocated the driver shoud | |
307 | * finish its initialization by setting name, private data, enable_radio | |
308 | * and disable_radio methods and then register it with rfkill_register(). | |
309 | * NOTE: If registration fails the structure shoudl be freed by calling | |
310 | * rfkill_free() otherwise rfkill_unregister() should be used. | |
311 | */ | |
312 | struct rfkill *rfkill_allocate(struct device *parent, enum rfkill_type type) | |
313 | { | |
314 | struct rfkill *rfkill; | |
315 | struct device *dev; | |
316 | ||
317 | rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL); | |
d007da1f | 318 | if (!rfkill) |
cf4328cd ID |
319 | return NULL; |
320 | ||
321 | mutex_init(&rfkill->mutex); | |
322 | INIT_LIST_HEAD(&rfkill->node); | |
323 | rfkill->type = type; | |
324 | ||
325 | dev = &rfkill->dev; | |
326 | dev->class = &rfkill_class; | |
327 | dev->parent = parent; | |
328 | device_initialize(dev); | |
329 | ||
330 | __module_get(THIS_MODULE); | |
331 | ||
332 | return rfkill; | |
333 | } | |
334 | EXPORT_SYMBOL(rfkill_allocate); | |
335 | ||
336 | /** | |
337 | * rfkill_free - Mark rfkill structure for deletion | |
338 | * @rfkill: rfkill structure to be destroyed | |
339 | * | |
340 | * Decrements reference count of rfkill structure so it is destoryed. | |
341 | * Note that rfkill_free() should _not_ be called after rfkill_unregister(). | |
342 | */ | |
343 | void rfkill_free(struct rfkill *rfkill) | |
344 | { | |
345 | if (rfkill) | |
346 | put_device(&rfkill->dev); | |
347 | } | |
348 | EXPORT_SYMBOL(rfkill_free); | |
349 | ||
135900c1 MB |
350 | static void rfkill_led_trigger_register(struct rfkill *rfkill) |
351 | { | |
352 | #ifdef CONFIG_RFKILL_LEDS | |
353 | int error; | |
354 | ||
355 | rfkill->led_trigger.name = rfkill->dev.bus_id; | |
356 | error = led_trigger_register(&rfkill->led_trigger); | |
357 | if (error) | |
358 | rfkill->led_trigger.name = NULL; | |
359 | #endif /* CONFIG_RFKILL_LEDS */ | |
360 | } | |
361 | ||
362 | static void rfkill_led_trigger_unregister(struct rfkill *rfkill) | |
363 | { | |
364 | #ifdef CONFIG_RFKILL_LEDS | |
365 | if (rfkill->led_trigger.name) | |
366 | led_trigger_unregister(&rfkill->led_trigger); | |
367 | #endif | |
368 | } | |
369 | ||
cf4328cd ID |
370 | /** |
371 | * rfkill_register - Register a rfkill structure. | |
372 | * @rfkill: rfkill structure to be registered | |
373 | * | |
374 | * This function should be called by the network driver when the rfkill | |
375 | * structure needs to be registered. Immediately from registration the | |
376 | * switch driver should be able to service calls to toggle_radio. | |
377 | */ | |
378 | int rfkill_register(struct rfkill *rfkill) | |
379 | { | |
380 | static atomic_t rfkill_no = ATOMIC_INIT(0); | |
381 | struct device *dev = &rfkill->dev; | |
382 | int error; | |
383 | ||
384 | if (!rfkill->toggle_radio) | |
385 | return -EINVAL; | |
7319f1e6 MB |
386 | if (rfkill->type >= RFKILL_TYPE_MAX) |
387 | return -EINVAL; | |
cf4328cd | 388 | |
8a8f1c04 MB |
389 | snprintf(dev->bus_id, sizeof(dev->bus_id), |
390 | "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1); | |
391 | ||
392 | rfkill_led_trigger_register(rfkill); | |
393 | ||
cf4328cd ID |
394 | error = rfkill_add_switch(rfkill); |
395 | if (error) | |
396 | return error; | |
397 | ||
cf4328cd ID |
398 | error = device_add(dev); |
399 | if (error) { | |
400 | rfkill_remove_switch(rfkill); | |
401 | return error; | |
402 | } | |
403 | ||
404 | return 0; | |
405 | } | |
406 | EXPORT_SYMBOL(rfkill_register); | |
407 | ||
408 | /** | |
409 | * rfkill_unregister - Uegister a rfkill structure. | |
410 | * @rfkill: rfkill structure to be unregistered | |
411 | * | |
412 | * This function should be called by the network driver during device | |
413 | * teardown to destroy rfkill structure. Note that rfkill_free() should | |
414 | * _not_ be called after rfkill_unregister(). | |
415 | */ | |
416 | void rfkill_unregister(struct rfkill *rfkill) | |
417 | { | |
418 | device_del(&rfkill->dev); | |
419 | rfkill_remove_switch(rfkill); | |
8a8f1c04 | 420 | rfkill_led_trigger_unregister(rfkill); |
cf4328cd ID |
421 | put_device(&rfkill->dev); |
422 | } | |
423 | EXPORT_SYMBOL(rfkill_unregister); | |
424 | ||
425 | /* | |
426 | * Rfkill module initialization/deinitialization. | |
427 | */ | |
428 | static int __init rfkill_init(void) | |
429 | { | |
430 | int error; | |
431 | int i; | |
432 | ||
433 | for (i = 0; i < ARRAY_SIZE(rfkill_states); i++) | |
434 | rfkill_states[i] = RFKILL_STATE_ON; | |
435 | ||
436 | error = class_register(&rfkill_class); | |
437 | if (error) { | |
438 | printk(KERN_ERR "rfkill: unable to register rfkill class\n"); | |
439 | return error; | |
440 | } | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
445 | static void __exit rfkill_exit(void) | |
446 | { | |
447 | class_unregister(&rfkill_class); | |
448 | } | |
449 | ||
2bf236d5 | 450 | subsys_initcall(rfkill_init); |
cf4328cd | 451 | module_exit(rfkill_exit); |