Commit | Line | Data |
---|---|---|
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 | ||
27366223 MB |
30 | /* Get declaration of rfkill_switch_all() to shut up sparse. */ |
31 | #include "rfkill-input.h" | |
32 | ||
33 | ||
cf4328cd ID |
34 | MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>"); |
35 | MODULE_VERSION("1.0"); | |
36 | MODULE_DESCRIPTION("RF switch support"); | |
37 | MODULE_LICENSE("GPL"); | |
38 | ||
39 | static LIST_HEAD(rfkill_list); /* list of registered rf switches */ | |
40 | static DEFINE_MUTEX(rfkill_mutex); | |
41 | ||
5005657c | 42 | static unsigned int rfkill_default_state = RFKILL_STATE_UNBLOCKED; |
e954b0b8 HMH |
43 | module_param_named(default_state, rfkill_default_state, uint, 0444); |
44 | MODULE_PARM_DESC(default_state, | |
45 | "Default initial state for all radio types, 0 = radio off"); | |
46 | ||
cf4328cd ID |
47 | static enum rfkill_state rfkill_states[RFKILL_TYPE_MAX]; |
48 | ||
79399a8d HMH |
49 | static BLOCKING_NOTIFIER_HEAD(rfkill_notifier_list); |
50 | ||
51 | ||
52 | /** | |
53 | * register_rfkill_notifier - Add notifier to rfkill notifier chain | |
54 | * @nb: pointer to the new entry to add to the chain | |
55 | * | |
56 | * See blocking_notifier_chain_register() for return value and further | |
57 | * observations. | |
58 | * | |
59 | * Adds a notifier to the rfkill notifier chain. The chain will be | |
60 | * called with a pointer to the relevant rfkill structure as a parameter, | |
61 | * refer to include/linux/rfkill.h for the possible events. | |
62 | * | |
63 | * Notifiers added to this chain are to always return NOTIFY_DONE. This | |
64 | * chain is a blocking notifier chain: notifiers can sleep. | |
65 | * | |
66 | * Calls to this chain may have been done through a workqueue. One must | |
67 | * assume unordered asynchronous behaviour, there is no way to know if | |
68 | * actions related to the event that generated the notification have been | |
69 | * carried out already. | |
70 | */ | |
71 | int register_rfkill_notifier(struct notifier_block *nb) | |
72 | { | |
73 | return blocking_notifier_chain_register(&rfkill_notifier_list, nb); | |
74 | } | |
75 | EXPORT_SYMBOL_GPL(register_rfkill_notifier); | |
76 | ||
77 | /** | |
78 | * unregister_rfkill_notifier - remove notifier from rfkill notifier chain | |
79 | * @nb: pointer to the entry to remove from the chain | |
80 | * | |
81 | * See blocking_notifier_chain_unregister() for return value and further | |
82 | * observations. | |
83 | * | |
84 | * Removes a notifier from the rfkill notifier chain. | |
85 | */ | |
86 | int unregister_rfkill_notifier(struct notifier_block *nb) | |
87 | { | |
88 | return blocking_notifier_chain_unregister(&rfkill_notifier_list, nb); | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(unregister_rfkill_notifier); | |
91 | ||
135900c1 MB |
92 | |
93 | static void rfkill_led_trigger(struct rfkill *rfkill, | |
94 | enum rfkill_state state) | |
95 | { | |
96 | #ifdef CONFIG_RFKILL_LEDS | |
97 | struct led_trigger *led = &rfkill->led_trigger; | |
98 | ||
99 | if (!led->name) | |
100 | return; | |
5005657c | 101 | if (state != RFKILL_STATE_UNBLOCKED) |
135900c1 MB |
102 | led_trigger_event(led, LED_OFF); |
103 | else | |
104 | led_trigger_event(led, LED_FULL); | |
105 | #endif /* CONFIG_RFKILL_LEDS */ | |
106 | } | |
107 | ||
79399a8d HMH |
108 | static void notify_rfkill_state_change(struct rfkill *rfkill) |
109 | { | |
110 | blocking_notifier_call_chain(&rfkill_notifier_list, | |
111 | RFKILL_STATE_CHANGED, | |
112 | rfkill); | |
113 | } | |
114 | ||
801e49af HMH |
115 | static void update_rfkill_state(struct rfkill *rfkill) |
116 | { | |
79399a8d | 117 | enum rfkill_state newstate, oldstate; |
801e49af HMH |
118 | |
119 | if (rfkill->get_state) { | |
120 | mutex_lock(&rfkill->mutex); | |
79399a8d HMH |
121 | if (!rfkill->get_state(rfkill->data, &newstate)) { |
122 | oldstate = rfkill->state; | |
801e49af | 123 | rfkill->state = newstate; |
79399a8d HMH |
124 | if (oldstate != newstate) |
125 | notify_rfkill_state_change(rfkill); | |
126 | } | |
801e49af HMH |
127 | mutex_unlock(&rfkill->mutex); |
128 | } | |
129 | } | |
130 | ||
5005657c HMH |
131 | /** |
132 | * rfkill_toggle_radio - wrapper for toggle_radio hook | |
133 | * calls toggle_radio taking into account a lot of "small" | |
134 | * details. | |
135 | * @rfkill: the rfkill struct to use | |
136 | * @force: calls toggle_radio even if cache says it is not needed, | |
137 | * and also makes sure notifications of the state will be | |
138 | * sent even if it didn't change | |
139 | * @state: the new state to call toggle_radio() with | |
140 | * | |
141 | * This wrappen protects and enforces the API for toggle_radio | |
142 | * calls. Note that @force cannot override a (possibly cached) | |
143 | * state of RFKILL_STATE_HARD_BLOCKED. Any device making use of | |
144 | * RFKILL_STATE_HARD_BLOCKED implements either get_state() or | |
145 | * rfkill_force_state(), so the cache either is bypassed or valid. | |
146 | * | |
147 | * Note that we do call toggle_radio for RFKILL_STATE_SOFT_BLOCKED | |
148 | * even if the radio is in RFKILL_STATE_HARD_BLOCKED state, so as to | |
149 | * give the driver a hint that it should double-BLOCK the transmitter. | |
150 | * | |
151 | * Caller must have aquired rfkill_mutex. | |
152 | */ | |
cf4328cd | 153 | static int rfkill_toggle_radio(struct rfkill *rfkill, |
526324b6 HMH |
154 | enum rfkill_state state, |
155 | int force) | |
cf4328cd | 156 | { |
7f4c5341 | 157 | int retval = 0; |
801e49af HMH |
158 | enum rfkill_state oldstate, newstate; |
159 | ||
160 | oldstate = rfkill->state; | |
161 | ||
526324b6 | 162 | if (rfkill->get_state && !force && |
801e49af HMH |
163 | !rfkill->get_state(rfkill->data, &newstate)) |
164 | rfkill->state = newstate; | |
cf4328cd | 165 | |
5005657c HMH |
166 | switch (state) { |
167 | case RFKILL_STATE_HARD_BLOCKED: | |
168 | /* typically happens when refreshing hardware state, | |
169 | * such as on resume */ | |
170 | state = RFKILL_STATE_SOFT_BLOCKED; | |
171 | break; | |
172 | case RFKILL_STATE_UNBLOCKED: | |
173 | /* force can't override this, only rfkill_force_state() can */ | |
174 | if (rfkill->state == RFKILL_STATE_HARD_BLOCKED) | |
175 | return -EPERM; | |
176 | break; | |
177 | case RFKILL_STATE_SOFT_BLOCKED: | |
178 | /* nothing to do, we want to give drivers the hint to double | |
179 | * BLOCK even a transmitter that is already in state | |
180 | * RFKILL_STATE_HARD_BLOCKED */ | |
181 | break; | |
182 | } | |
183 | ||
526324b6 | 184 | if (force || state != rfkill->state) { |
cf4328cd | 185 | retval = rfkill->toggle_radio(rfkill->data, state); |
5005657c HMH |
186 | /* never allow a HARD->SOFT downgrade! */ |
187 | if (!retval && rfkill->state != RFKILL_STATE_HARD_BLOCKED) | |
cf4328cd ID |
188 | rfkill->state = state; |
189 | } | |
190 | ||
79399a8d | 191 | if (force || rfkill->state != oldstate) { |
801e49af | 192 | rfkill_led_trigger(rfkill, rfkill->state); |
79399a8d HMH |
193 | notify_rfkill_state_change(rfkill); |
194 | } | |
801e49af | 195 | |
cf4328cd ID |
196 | return retval; |
197 | } | |
198 | ||
199 | /** | |
200 | * rfkill_switch_all - Toggle state of all switches of given type | |
201 | * @type: type of interfaces to be affeceted | |
202 | * @state: the new state | |
203 | * | |
204 | * This function toggles state of all switches of given type unless | |
205 | * a specific switch is claimed by userspace in which case it is | |
206 | * left alone. | |
207 | */ | |
cf4328cd ID |
208 | void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state) |
209 | { | |
210 | struct rfkill *rfkill; | |
211 | ||
212 | mutex_lock(&rfkill_mutex); | |
213 | ||
214 | rfkill_states[type] = state; | |
215 | ||
216 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
89796f64 | 217 | if ((!rfkill->user_claim) && (rfkill->type == type)) |
526324b6 | 218 | rfkill_toggle_radio(rfkill, state, 0); |
cf4328cd ID |
219 | } |
220 | ||
221 | mutex_unlock(&rfkill_mutex); | |
222 | } | |
223 | EXPORT_SYMBOL(rfkill_switch_all); | |
224 | ||
4081f00d HMH |
225 | /** |
226 | * rfkill_epo - emergency power off all transmitters | |
227 | * | |
5005657c | 228 | * This kicks all rfkill devices to RFKILL_STATE_SOFT_BLOCKED, ignoring |
4081f00d HMH |
229 | * everything in its path but rfkill_mutex. |
230 | */ | |
231 | void rfkill_epo(void) | |
232 | { | |
233 | struct rfkill *rfkill; | |
234 | ||
235 | mutex_lock(&rfkill_mutex); | |
236 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
5005657c | 237 | rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1); |
4081f00d HMH |
238 | } |
239 | mutex_unlock(&rfkill_mutex); | |
240 | } | |
241 | EXPORT_SYMBOL_GPL(rfkill_epo); | |
242 | ||
801e49af HMH |
243 | /** |
244 | * rfkill_force_state - Force the internal rfkill radio state | |
245 | * @rfkill: pointer to the rfkill class to modify. | |
246 | * @state: the current radio state the class should be forced to. | |
247 | * | |
248 | * This function updates the internal state of the radio cached | |
249 | * by the rfkill class. It should be used when the driver gets | |
250 | * a notification by the firmware/hardware of the current *real* | |
251 | * state of the radio rfkill switch. | |
252 | * | |
253 | * It may not be called from an atomic context. | |
254 | */ | |
255 | int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state) | |
256 | { | |
79399a8d HMH |
257 | enum rfkill_state oldstate; |
258 | ||
5005657c HMH |
259 | if (state != RFKILL_STATE_SOFT_BLOCKED && |
260 | state != RFKILL_STATE_UNBLOCKED && | |
261 | state != RFKILL_STATE_HARD_BLOCKED) | |
801e49af HMH |
262 | return -EINVAL; |
263 | ||
264 | mutex_lock(&rfkill->mutex); | |
79399a8d HMH |
265 | |
266 | oldstate = rfkill->state; | |
801e49af | 267 | rfkill->state = state; |
79399a8d HMH |
268 | |
269 | if (state != oldstate) | |
270 | notify_rfkill_state_change(rfkill); | |
271 | ||
801e49af HMH |
272 | mutex_unlock(&rfkill->mutex); |
273 | ||
274 | return 0; | |
275 | } | |
276 | EXPORT_SYMBOL(rfkill_force_state); | |
277 | ||
cf4328cd ID |
278 | static ssize_t rfkill_name_show(struct device *dev, |
279 | struct device_attribute *attr, | |
280 | char *buf) | |
281 | { | |
282 | struct rfkill *rfkill = to_rfkill(dev); | |
283 | ||
284 | return sprintf(buf, "%s\n", rfkill->name); | |
285 | } | |
286 | ||
99c632e5 | 287 | static const char *rfkill_get_type_str(enum rfkill_type type) |
cf4328cd | 288 | { |
99c632e5 | 289 | switch (type) { |
cf4328cd | 290 | case RFKILL_TYPE_WLAN: |
99c632e5 | 291 | return "wlan"; |
cf4328cd | 292 | case RFKILL_TYPE_BLUETOOTH: |
99c632e5 | 293 | return "bluetooth"; |
e0665486 | 294 | case RFKILL_TYPE_UWB: |
99c632e5 | 295 | return "ultrawideband"; |
303d9bf6 | 296 | case RFKILL_TYPE_WIMAX: |
99c632e5 | 297 | return "wimax"; |
477576a0 | 298 | case RFKILL_TYPE_WWAN: |
99c632e5 | 299 | return "wwan"; |
cf4328cd ID |
300 | default: |
301 | BUG(); | |
302 | } | |
99c632e5 HMH |
303 | } |
304 | ||
305 | static ssize_t rfkill_type_show(struct device *dev, | |
306 | struct device_attribute *attr, | |
307 | char *buf) | |
308 | { | |
309 | struct rfkill *rfkill = to_rfkill(dev); | |
cf4328cd | 310 | |
99c632e5 | 311 | return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type)); |
cf4328cd ID |
312 | } |
313 | ||
314 | static ssize_t rfkill_state_show(struct device *dev, | |
315 | struct device_attribute *attr, | |
316 | char *buf) | |
317 | { | |
318 | struct rfkill *rfkill = to_rfkill(dev); | |
319 | ||
801e49af | 320 | update_rfkill_state(rfkill); |
cf4328cd ID |
321 | return sprintf(buf, "%d\n", rfkill->state); |
322 | } | |
323 | ||
324 | static ssize_t rfkill_state_store(struct device *dev, | |
325 | struct device_attribute *attr, | |
326 | const char *buf, size_t count) | |
327 | { | |
328 | struct rfkill *rfkill = to_rfkill(dev); | |
329 | unsigned int state = simple_strtoul(buf, NULL, 0); | |
330 | int error; | |
331 | ||
332 | if (!capable(CAP_NET_ADMIN)) | |
333 | return -EPERM; | |
334 | ||
5005657c HMH |
335 | /* RFKILL_STATE_HARD_BLOCKED is illegal here... */ |
336 | if (state != RFKILL_STATE_UNBLOCKED && | |
337 | state != RFKILL_STATE_SOFT_BLOCKED) | |
338 | return -EINVAL; | |
339 | ||
7f4c5341 MB |
340 | if (mutex_lock_interruptible(&rfkill->mutex)) |
341 | return -ERESTARTSYS; | |
5005657c | 342 | error = rfkill_toggle_radio(rfkill, state, 0); |
7f4c5341 | 343 | mutex_unlock(&rfkill->mutex); |
cf4328cd | 344 | |
7f4c5341 | 345 | return error ? error : count; |
cf4328cd ID |
346 | } |
347 | ||
348 | static ssize_t rfkill_claim_show(struct device *dev, | |
349 | struct device_attribute *attr, | |
350 | char *buf) | |
351 | { | |
352 | struct rfkill *rfkill = to_rfkill(dev); | |
353 | ||
354 | return sprintf(buf, "%d", rfkill->user_claim); | |
355 | } | |
356 | ||
357 | static ssize_t rfkill_claim_store(struct device *dev, | |
358 | struct device_attribute *attr, | |
359 | const char *buf, size_t count) | |
360 | { | |
361 | struct rfkill *rfkill = to_rfkill(dev); | |
362 | bool claim = !!simple_strtoul(buf, NULL, 0); | |
363 | int error; | |
364 | ||
365 | if (!capable(CAP_NET_ADMIN)) | |
366 | return -EPERM; | |
367 | ||
368 | /* | |
369 | * Take the global lock to make sure the kernel is not in | |
370 | * the middle of rfkill_switch_all | |
371 | */ | |
372 | error = mutex_lock_interruptible(&rfkill_mutex); | |
373 | if (error) | |
374 | return error; | |
375 | ||
20405c08 MB |
376 | if (rfkill->user_claim_unsupported) { |
377 | error = -EOPNOTSUPP; | |
378 | goto out_unlock; | |
379 | } | |
cf4328cd ID |
380 | if (rfkill->user_claim != claim) { |
381 | if (!claim) | |
382 | rfkill_toggle_radio(rfkill, | |
526324b6 HMH |
383 | rfkill_states[rfkill->type], |
384 | 0); | |
cf4328cd ID |
385 | rfkill->user_claim = claim; |
386 | } | |
387 | ||
20405c08 | 388 | out_unlock: |
cf4328cd ID |
389 | mutex_unlock(&rfkill_mutex); |
390 | ||
20405c08 | 391 | return error ? error : count; |
cf4328cd ID |
392 | } |
393 | ||
394 | static struct device_attribute rfkill_dev_attrs[] = { | |
395 | __ATTR(name, S_IRUGO, rfkill_name_show, NULL), | |
396 | __ATTR(type, S_IRUGO, rfkill_type_show, NULL), | |
c81de6ad | 397 | __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store), |
cf4328cd ID |
398 | __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store), |
399 | __ATTR_NULL | |
400 | }; | |
401 | ||
402 | static void rfkill_release(struct device *dev) | |
403 | { | |
404 | struct rfkill *rfkill = to_rfkill(dev); | |
405 | ||
406 | kfree(rfkill); | |
407 | module_put(THIS_MODULE); | |
408 | } | |
409 | ||
410 | #ifdef CONFIG_PM | |
411 | static int rfkill_suspend(struct device *dev, pm_message_t state) | |
412 | { | |
413 | struct rfkill *rfkill = to_rfkill(dev); | |
414 | ||
415 | if (dev->power.power_state.event != state.event) { | |
3a2d5b70 | 416 | if (state.event & PM_EVENT_SLEEP) { |
526324b6 HMH |
417 | /* Stop transmitter, keep state, no notifies */ |
418 | update_rfkill_state(rfkill); | |
cf4328cd | 419 | |
526324b6 | 420 | mutex_lock(&rfkill->mutex); |
5005657c HMH |
421 | rfkill->toggle_radio(rfkill->data, |
422 | RFKILL_STATE_SOFT_BLOCKED); | |
cf4328cd ID |
423 | mutex_unlock(&rfkill->mutex); |
424 | } | |
425 | ||
426 | dev->power.power_state = state; | |
427 | } | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
432 | static int rfkill_resume(struct device *dev) | |
433 | { | |
434 | struct rfkill *rfkill = to_rfkill(dev); | |
435 | ||
436 | if (dev->power.power_state.event != PM_EVENT_ON) { | |
437 | mutex_lock(&rfkill->mutex); | |
438 | ||
526324b6 HMH |
439 | /* restore radio state AND notify everybody */ |
440 | rfkill_toggle_radio(rfkill, rfkill->state, 1); | |
cf4328cd ID |
441 | |
442 | mutex_unlock(&rfkill->mutex); | |
443 | } | |
444 | ||
445 | dev->power.power_state = PMSG_ON; | |
446 | return 0; | |
447 | } | |
448 | #else | |
449 | #define rfkill_suspend NULL | |
450 | #define rfkill_resume NULL | |
451 | #endif | |
452 | ||
ffb67c34 HMH |
453 | static int rfkill_blocking_uevent_notifier(struct notifier_block *nb, |
454 | unsigned long eventid, | |
455 | void *data) | |
456 | { | |
457 | struct rfkill *rfkill = (struct rfkill *)data; | |
458 | ||
459 | switch (eventid) { | |
460 | case RFKILL_STATE_CHANGED: | |
461 | kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE); | |
462 | break; | |
463 | default: | |
464 | break; | |
465 | } | |
466 | ||
467 | return NOTIFY_DONE; | |
468 | } | |
469 | ||
470 | static struct notifier_block rfkill_blocking_uevent_nb = { | |
471 | .notifier_call = rfkill_blocking_uevent_notifier, | |
472 | .priority = 0, | |
473 | }; | |
474 | ||
475 | static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
476 | { | |
477 | struct rfkill *rfkill = to_rfkill(dev); | |
478 | int error; | |
479 | ||
480 | error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name); | |
481 | if (error) | |
482 | return error; | |
483 | error = add_uevent_var(env, "RFKILL_TYPE=%s", | |
484 | rfkill_get_type_str(rfkill->type)); | |
485 | if (error) | |
486 | return error; | |
487 | error = add_uevent_var(env, "RFKILL_STATE=%d", rfkill->state); | |
488 | return error; | |
489 | } | |
490 | ||
cf4328cd ID |
491 | static struct class rfkill_class = { |
492 | .name = "rfkill", | |
493 | .dev_release = rfkill_release, | |
494 | .dev_attrs = rfkill_dev_attrs, | |
495 | .suspend = rfkill_suspend, | |
496 | .resume = rfkill_resume, | |
ffb67c34 | 497 | .dev_uevent = rfkill_dev_uevent, |
cf4328cd ID |
498 | }; |
499 | ||
500 | static int rfkill_add_switch(struct rfkill *rfkill) | |
501 | { | |
7319f1e6 | 502 | int error; |
cf4328cd | 503 | |
7319f1e6 | 504 | mutex_lock(&rfkill_mutex); |
cf4328cd | 505 | |
526324b6 | 506 | error = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type], 0); |
7319f1e6 MB |
507 | if (!error) |
508 | list_add_tail(&rfkill->node, &rfkill_list); | |
cf4328cd | 509 | |
cf4328cd | 510 | mutex_unlock(&rfkill_mutex); |
7319f1e6 MB |
511 | |
512 | return error; | |
cf4328cd ID |
513 | } |
514 | ||
515 | static void rfkill_remove_switch(struct rfkill *rfkill) | |
516 | { | |
517 | mutex_lock(&rfkill_mutex); | |
518 | list_del_init(&rfkill->node); | |
5005657c | 519 | rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1); |
cf4328cd ID |
520 | mutex_unlock(&rfkill_mutex); |
521 | } | |
522 | ||
523 | /** | |
524 | * rfkill_allocate - allocate memory for rfkill structure. | |
525 | * @parent: device that has rf switch on it | |
234a0ca6 | 526 | * @type: type of the switch (RFKILL_TYPE_*) |
cf4328cd ID |
527 | * |
528 | * This function should be called by the network driver when it needs | |
529 | * rfkill structure. Once the structure is allocated the driver shoud | |
530 | * finish its initialization by setting name, private data, enable_radio | |
531 | * and disable_radio methods and then register it with rfkill_register(). | |
532 | * NOTE: If registration fails the structure shoudl be freed by calling | |
533 | * rfkill_free() otherwise rfkill_unregister() should be used. | |
534 | */ | |
535 | struct rfkill *rfkill_allocate(struct device *parent, enum rfkill_type type) | |
536 | { | |
537 | struct rfkill *rfkill; | |
538 | struct device *dev; | |
539 | ||
540 | rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL); | |
d007da1f | 541 | if (!rfkill) |
cf4328cd ID |
542 | return NULL; |
543 | ||
544 | mutex_init(&rfkill->mutex); | |
545 | INIT_LIST_HEAD(&rfkill->node); | |
546 | rfkill->type = type; | |
547 | ||
548 | dev = &rfkill->dev; | |
549 | dev->class = &rfkill_class; | |
550 | dev->parent = parent; | |
551 | device_initialize(dev); | |
552 | ||
553 | __module_get(THIS_MODULE); | |
554 | ||
555 | return rfkill; | |
556 | } | |
557 | EXPORT_SYMBOL(rfkill_allocate); | |
558 | ||
559 | /** | |
560 | * rfkill_free - Mark rfkill structure for deletion | |
561 | * @rfkill: rfkill structure to be destroyed | |
562 | * | |
1dbede87 | 563 | * Decrements reference count of rfkill structure so it is destroyed. |
cf4328cd ID |
564 | * Note that rfkill_free() should _not_ be called after rfkill_unregister(). |
565 | */ | |
566 | void rfkill_free(struct rfkill *rfkill) | |
567 | { | |
568 | if (rfkill) | |
569 | put_device(&rfkill->dev); | |
570 | } | |
571 | EXPORT_SYMBOL(rfkill_free); | |
572 | ||
135900c1 MB |
573 | static void rfkill_led_trigger_register(struct rfkill *rfkill) |
574 | { | |
575 | #ifdef CONFIG_RFKILL_LEDS | |
576 | int error; | |
577 | ||
578 | rfkill->led_trigger.name = rfkill->dev.bus_id; | |
579 | error = led_trigger_register(&rfkill->led_trigger); | |
580 | if (error) | |
581 | rfkill->led_trigger.name = NULL; | |
582 | #endif /* CONFIG_RFKILL_LEDS */ | |
583 | } | |
584 | ||
585 | static void rfkill_led_trigger_unregister(struct rfkill *rfkill) | |
586 | { | |
587 | #ifdef CONFIG_RFKILL_LEDS | |
588 | if (rfkill->led_trigger.name) | |
589 | led_trigger_unregister(&rfkill->led_trigger); | |
590 | #endif | |
591 | } | |
592 | ||
cf4328cd ID |
593 | /** |
594 | * rfkill_register - Register a rfkill structure. | |
595 | * @rfkill: rfkill structure to be registered | |
596 | * | |
597 | * This function should be called by the network driver when the rfkill | |
598 | * structure needs to be registered. Immediately from registration the | |
599 | * switch driver should be able to service calls to toggle_radio. | |
600 | */ | |
601 | int rfkill_register(struct rfkill *rfkill) | |
602 | { | |
603 | static atomic_t rfkill_no = ATOMIC_INIT(0); | |
604 | struct device *dev = &rfkill->dev; | |
605 | int error; | |
606 | ||
607 | if (!rfkill->toggle_radio) | |
608 | return -EINVAL; | |
7319f1e6 MB |
609 | if (rfkill->type >= RFKILL_TYPE_MAX) |
610 | return -EINVAL; | |
cf4328cd | 611 | |
8a8f1c04 MB |
612 | snprintf(dev->bus_id, sizeof(dev->bus_id), |
613 | "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1); | |
614 | ||
615 | rfkill_led_trigger_register(rfkill); | |
616 | ||
cf4328cd | 617 | error = rfkill_add_switch(rfkill); |
632041f3 EP |
618 | if (error) { |
619 | rfkill_led_trigger_unregister(rfkill); | |
cf4328cd | 620 | return error; |
632041f3 | 621 | } |
cf4328cd | 622 | |
cf4328cd ID |
623 | error = device_add(dev); |
624 | if (error) { | |
632041f3 | 625 | rfkill_led_trigger_unregister(rfkill); |
cf4328cd ID |
626 | rfkill_remove_switch(rfkill); |
627 | return error; | |
628 | } | |
629 | ||
630 | return 0; | |
631 | } | |
632 | EXPORT_SYMBOL(rfkill_register); | |
633 | ||
634 | /** | |
c8fcd905 | 635 | * rfkill_unregister - Unregister a rfkill structure. |
cf4328cd ID |
636 | * @rfkill: rfkill structure to be unregistered |
637 | * | |
638 | * This function should be called by the network driver during device | |
639 | * teardown to destroy rfkill structure. Note that rfkill_free() should | |
640 | * _not_ be called after rfkill_unregister(). | |
641 | */ | |
642 | void rfkill_unregister(struct rfkill *rfkill) | |
643 | { | |
644 | device_del(&rfkill->dev); | |
645 | rfkill_remove_switch(rfkill); | |
8a8f1c04 | 646 | rfkill_led_trigger_unregister(rfkill); |
cf4328cd ID |
647 | put_device(&rfkill->dev); |
648 | } | |
649 | EXPORT_SYMBOL(rfkill_unregister); | |
650 | ||
651 | /* | |
652 | * Rfkill module initialization/deinitialization. | |
653 | */ | |
654 | static int __init rfkill_init(void) | |
655 | { | |
656 | int error; | |
657 | int i; | |
658 | ||
5005657c HMH |
659 | /* RFKILL_STATE_HARD_BLOCKED is illegal here... */ |
660 | if (rfkill_default_state != RFKILL_STATE_SOFT_BLOCKED && | |
661 | rfkill_default_state != RFKILL_STATE_UNBLOCKED) | |
e954b0b8 HMH |
662 | return -EINVAL; |
663 | ||
cf4328cd | 664 | for (i = 0; i < ARRAY_SIZE(rfkill_states); i++) |
e954b0b8 | 665 | rfkill_states[i] = rfkill_default_state; |
cf4328cd ID |
666 | |
667 | error = class_register(&rfkill_class); | |
668 | if (error) { | |
669 | printk(KERN_ERR "rfkill: unable to register rfkill class\n"); | |
670 | return error; | |
671 | } | |
672 | ||
ffb67c34 HMH |
673 | register_rfkill_notifier(&rfkill_blocking_uevent_nb); |
674 | ||
cf4328cd ID |
675 | return 0; |
676 | } | |
677 | ||
678 | static void __exit rfkill_exit(void) | |
679 | { | |
ffb67c34 | 680 | unregister_rfkill_notifier(&rfkill_blocking_uevent_nb); |
cf4328cd ID |
681 | class_unregister(&rfkill_class); |
682 | } | |
683 | ||
2bf236d5 | 684 | subsys_initcall(rfkill_init); |
cf4328cd | 685 | module_exit(rfkill_exit); |