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 */ | |
15635744 | 40 | static DEFINE_MUTEX(rfkill_global_mutex); |
cf4328cd | 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 | ||
99619201 HMH |
47 | struct rfkill_gsw_state { |
48 | enum rfkill_state current_state; | |
49 | enum rfkill_state default_state; | |
50 | }; | |
51 | ||
52 | static struct rfkill_gsw_state rfkill_global_states[RFKILL_TYPE_MAX]; | |
53 | static unsigned long rfkill_states_lockdflt[BITS_TO_LONGS(RFKILL_TYPE_MAX)]; | |
d003922d | 54 | static bool rfkill_epo_lock_active; |
cf4328cd | 55 | |
135900c1 | 56 | |
f32f8b72 | 57 | #ifdef CONFIG_RFKILL_LEDS |
135900c1 MB |
58 | static void rfkill_led_trigger(struct rfkill *rfkill, |
59 | enum rfkill_state state) | |
60 | { | |
135900c1 MB |
61 | struct led_trigger *led = &rfkill->led_trigger; |
62 | ||
63 | if (!led->name) | |
64 | return; | |
5005657c | 65 | if (state != RFKILL_STATE_UNBLOCKED) |
135900c1 MB |
66 | led_trigger_event(led, LED_OFF); |
67 | else | |
68 | led_trigger_event(led, LED_FULL); | |
135900c1 MB |
69 | } |
70 | ||
96185664 DB |
71 | static void rfkill_led_trigger_activate(struct led_classdev *led) |
72 | { | |
73 | struct rfkill *rfkill = container_of(led->trigger, | |
74 | struct rfkill, led_trigger); | |
75 | ||
76 | rfkill_led_trigger(rfkill, rfkill->state); | |
77 | } | |
78 | #endif /* CONFIG_RFKILL_LEDS */ | |
79 | ||
4dec9b80 | 80 | static void rfkill_uevent(struct rfkill *rfkill) |
79399a8d | 81 | { |
4dec9b80 | 82 | kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE); |
79399a8d HMH |
83 | } |
84 | ||
801e49af HMH |
85 | static void update_rfkill_state(struct rfkill *rfkill) |
86 | { | |
79399a8d | 87 | enum rfkill_state newstate, oldstate; |
801e49af HMH |
88 | |
89 | if (rfkill->get_state) { | |
90 | mutex_lock(&rfkill->mutex); | |
79399a8d HMH |
91 | if (!rfkill->get_state(rfkill->data, &newstate)) { |
92 | oldstate = rfkill->state; | |
801e49af | 93 | rfkill->state = newstate; |
79399a8d | 94 | if (oldstate != newstate) |
4dec9b80 | 95 | rfkill_uevent(rfkill); |
79399a8d | 96 | } |
801e49af HMH |
97 | mutex_unlock(&rfkill->mutex); |
98 | } | |
99 | } | |
100 | ||
5005657c HMH |
101 | /** |
102 | * rfkill_toggle_radio - wrapper for toggle_radio hook | |
5005657c HMH |
103 | * @rfkill: the rfkill struct to use |
104 | * @force: calls toggle_radio even if cache says it is not needed, | |
105 | * and also makes sure notifications of the state will be | |
106 | * sent even if it didn't change | |
107 | * @state: the new state to call toggle_radio() with | |
108 | * | |
0f687e9a HMH |
109 | * Calls rfkill->toggle_radio, enforcing the API for toggle_radio |
110 | * calls and handling all the red tape such as issuing notifications | |
111 | * if the call is successful. | |
112 | * | |
e10e0dfe HMH |
113 | * Suspended devices are not touched at all, and -EAGAIN is returned. |
114 | * | |
435307a3 HMH |
115 | * Note that the @force parameter cannot override a (possibly cached) |
116 | * state of RFKILL_STATE_HARD_BLOCKED. Any device making use of | |
5005657c HMH |
117 | * RFKILL_STATE_HARD_BLOCKED implements either get_state() or |
118 | * rfkill_force_state(), so the cache either is bypassed or valid. | |
119 | * | |
120 | * Note that we do call toggle_radio for RFKILL_STATE_SOFT_BLOCKED | |
121 | * even if the radio is in RFKILL_STATE_HARD_BLOCKED state, so as to | |
122 | * give the driver a hint that it should double-BLOCK the transmitter. | |
123 | * | |
064af111 | 124 | * Caller must have acquired rfkill->mutex. |
5005657c | 125 | */ |
cf4328cd | 126 | static int rfkill_toggle_radio(struct rfkill *rfkill, |
526324b6 HMH |
127 | enum rfkill_state state, |
128 | int force) | |
cf4328cd | 129 | { |
7f4c5341 | 130 | int retval = 0; |
801e49af HMH |
131 | enum rfkill_state oldstate, newstate; |
132 | ||
e10e0dfe HMH |
133 | if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP)) |
134 | return -EBUSY; | |
135 | ||
801e49af HMH |
136 | oldstate = rfkill->state; |
137 | ||
526324b6 | 138 | if (rfkill->get_state && !force && |
801e49af HMH |
139 | !rfkill->get_state(rfkill->data, &newstate)) |
140 | rfkill->state = newstate; | |
cf4328cd | 141 | |
5005657c HMH |
142 | switch (state) { |
143 | case RFKILL_STATE_HARD_BLOCKED: | |
144 | /* typically happens when refreshing hardware state, | |
145 | * such as on resume */ | |
146 | state = RFKILL_STATE_SOFT_BLOCKED; | |
147 | break; | |
148 | case RFKILL_STATE_UNBLOCKED: | |
149 | /* force can't override this, only rfkill_force_state() can */ | |
150 | if (rfkill->state == RFKILL_STATE_HARD_BLOCKED) | |
151 | return -EPERM; | |
152 | break; | |
153 | case RFKILL_STATE_SOFT_BLOCKED: | |
154 | /* nothing to do, we want to give drivers the hint to double | |
155 | * BLOCK even a transmitter that is already in state | |
156 | * RFKILL_STATE_HARD_BLOCKED */ | |
157 | break; | |
96c87607 | 158 | default: |
f745ba03 HMH |
159 | WARN(1, KERN_WARNING |
160 | "rfkill: illegal state %d passed as parameter " | |
161 | "to rfkill_toggle_radio\n", state); | |
96c87607 | 162 | return -EINVAL; |
5005657c HMH |
163 | } |
164 | ||
526324b6 | 165 | if (force || state != rfkill->state) { |
cf4328cd | 166 | retval = rfkill->toggle_radio(rfkill->data, state); |
5005657c HMH |
167 | /* never allow a HARD->SOFT downgrade! */ |
168 | if (!retval && rfkill->state != RFKILL_STATE_HARD_BLOCKED) | |
cf4328cd ID |
169 | rfkill->state = state; |
170 | } | |
171 | ||
417bd25a | 172 | if (force || rfkill->state != oldstate) |
4dec9b80 | 173 | rfkill_uevent(rfkill); |
801e49af | 174 | |
cf4328cd ID |
175 | return retval; |
176 | } | |
177 | ||
178 | /** | |
99619201 | 179 | * __rfkill_switch_all - Toggle state of all switches of given type |
435307a3 | 180 | * @type: type of interfaces to be affected |
cf4328cd ID |
181 | * @state: the new state |
182 | * | |
435307a3 HMH |
183 | * This function toggles the state of all switches of given type, |
184 | * unless a specific switch is claimed by userspace (in which case, | |
e10e0dfe | 185 | * that switch is left alone) or suspended. |
99619201 | 186 | * |
15635744 | 187 | * Caller must have acquired rfkill_global_mutex. |
cf4328cd | 188 | */ |
99619201 HMH |
189 | static void __rfkill_switch_all(const enum rfkill_type type, |
190 | const enum rfkill_state state) | |
cf4328cd ID |
191 | { |
192 | struct rfkill *rfkill; | |
193 | ||
f745ba03 HMH |
194 | if (WARN((state >= RFKILL_STATE_MAX || type >= RFKILL_TYPE_MAX), |
195 | KERN_WARNING | |
196 | "rfkill: illegal state %d or type %d " | |
197 | "passed as parameter to __rfkill_switch_all\n", | |
198 | state, type)) | |
96c87607 HMH |
199 | return; |
200 | ||
99619201 | 201 | rfkill_global_states[type].current_state = state; |
cf4328cd | 202 | list_for_each_entry(rfkill, &rfkill_list, node) { |
064af111 HMH |
203 | if ((!rfkill->user_claim) && (rfkill->type == type)) { |
204 | mutex_lock(&rfkill->mutex); | |
526324b6 | 205 | rfkill_toggle_radio(rfkill, state, 0); |
064af111 HMH |
206 | mutex_unlock(&rfkill->mutex); |
207 | } | |
cf4328cd | 208 | } |
99619201 | 209 | } |
cf4328cd | 210 | |
99619201 HMH |
211 | /** |
212 | * rfkill_switch_all - Toggle state of all switches of given type | |
213 | * @type: type of interfaces to be affected | |
214 | * @state: the new state | |
215 | * | |
15635744 | 216 | * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state). |
99619201 | 217 | * Please refer to __rfkill_switch_all() for details. |
d003922d HMH |
218 | * |
219 | * Does nothing if the EPO lock is active. | |
99619201 HMH |
220 | */ |
221 | void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state) | |
222 | { | |
15635744 | 223 | mutex_lock(&rfkill_global_mutex); |
d003922d HMH |
224 | if (!rfkill_epo_lock_active) |
225 | __rfkill_switch_all(type, state); | |
15635744 | 226 | mutex_unlock(&rfkill_global_mutex); |
cf4328cd ID |
227 | } |
228 | EXPORT_SYMBOL(rfkill_switch_all); | |
229 | ||
4081f00d HMH |
230 | /** |
231 | * rfkill_epo - emergency power off all transmitters | |
232 | * | |
e10e0dfe | 233 | * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED, |
15635744 | 234 | * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex. |
99619201 HMH |
235 | * |
236 | * The global state before the EPO is saved and can be restored later | |
237 | * using rfkill_restore_states(). | |
4081f00d HMH |
238 | */ |
239 | void rfkill_epo(void) | |
240 | { | |
241 | struct rfkill *rfkill; | |
99619201 | 242 | int i; |
4081f00d | 243 | |
15635744 HMH |
244 | mutex_lock(&rfkill_global_mutex); |
245 | ||
d003922d | 246 | rfkill_epo_lock_active = true; |
4081f00d | 247 | list_for_each_entry(rfkill, &rfkill_list, node) { |
064af111 | 248 | mutex_lock(&rfkill->mutex); |
5005657c | 249 | rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1); |
064af111 | 250 | mutex_unlock(&rfkill->mutex); |
4081f00d | 251 | } |
99619201 HMH |
252 | for (i = 0; i < RFKILL_TYPE_MAX; i++) { |
253 | rfkill_global_states[i].default_state = | |
254 | rfkill_global_states[i].current_state; | |
255 | rfkill_global_states[i].current_state = | |
256 | RFKILL_STATE_SOFT_BLOCKED; | |
257 | } | |
15635744 | 258 | mutex_unlock(&rfkill_global_mutex); |
4081f00d HMH |
259 | } |
260 | EXPORT_SYMBOL_GPL(rfkill_epo); | |
261 | ||
99619201 HMH |
262 | /** |
263 | * rfkill_restore_states - restore global states | |
264 | * | |
265 | * Restore (and sync switches to) the global state from the | |
266 | * states in rfkill_default_states. This can undo the effects of | |
267 | * a call to rfkill_epo(). | |
268 | */ | |
269 | void rfkill_restore_states(void) | |
270 | { | |
271 | int i; | |
272 | ||
15635744 HMH |
273 | mutex_lock(&rfkill_global_mutex); |
274 | ||
d003922d | 275 | rfkill_epo_lock_active = false; |
99619201 HMH |
276 | for (i = 0; i < RFKILL_TYPE_MAX; i++) |
277 | __rfkill_switch_all(i, rfkill_global_states[i].default_state); | |
15635744 | 278 | mutex_unlock(&rfkill_global_mutex); |
99619201 HMH |
279 | } |
280 | EXPORT_SYMBOL_GPL(rfkill_restore_states); | |
281 | ||
d003922d HMH |
282 | /** |
283 | * rfkill_remove_epo_lock - unlock state changes | |
284 | * | |
285 | * Used by rfkill-input manually unlock state changes, when | |
286 | * the EPO switch is deactivated. | |
287 | */ | |
288 | void rfkill_remove_epo_lock(void) | |
289 | { | |
290 | mutex_lock(&rfkill_global_mutex); | |
291 | rfkill_epo_lock_active = false; | |
292 | mutex_unlock(&rfkill_global_mutex); | |
293 | } | |
294 | EXPORT_SYMBOL_GPL(rfkill_remove_epo_lock); | |
295 | ||
296 | /** | |
297 | * rfkill_is_epo_lock_active - returns true EPO is active | |
298 | * | |
299 | * Returns 0 (false) if there is NOT an active EPO contidion, | |
300 | * and 1 (true) if there is an active EPO contition, which | |
301 | * locks all radios in one of the BLOCKED states. | |
302 | * | |
303 | * Can be called in atomic context. | |
304 | */ | |
305 | bool rfkill_is_epo_lock_active(void) | |
306 | { | |
307 | return rfkill_epo_lock_active; | |
308 | } | |
309 | EXPORT_SYMBOL_GPL(rfkill_is_epo_lock_active); | |
310 | ||
68d2413b HMH |
311 | /** |
312 | * rfkill_get_global_state - returns global state for a type | |
313 | * @type: the type to get the global state of | |
314 | * | |
315 | * Returns the current global state for a given wireless | |
316 | * device type. | |
317 | */ | |
318 | enum rfkill_state rfkill_get_global_state(const enum rfkill_type type) | |
319 | { | |
320 | return rfkill_global_states[type].current_state; | |
321 | } | |
322 | EXPORT_SYMBOL_GPL(rfkill_get_global_state); | |
323 | ||
801e49af HMH |
324 | /** |
325 | * rfkill_force_state - Force the internal rfkill radio state | |
326 | * @rfkill: pointer to the rfkill class to modify. | |
327 | * @state: the current radio state the class should be forced to. | |
328 | * | |
329 | * This function updates the internal state of the radio cached | |
330 | * by the rfkill class. It should be used when the driver gets | |
331 | * a notification by the firmware/hardware of the current *real* | |
332 | * state of the radio rfkill switch. | |
333 | * | |
2fd9b221 HMH |
334 | * Devices which are subject to external changes on their rfkill |
335 | * state (such as those caused by a hardware rfkill line) MUST | |
336 | * have their driver arrange to call rfkill_force_state() as soon | |
337 | * as possible after such a change. | |
338 | * | |
339 | * This function may not be called from an atomic context. | |
801e49af HMH |
340 | */ |
341 | int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state) | |
342 | { | |
79399a8d HMH |
343 | enum rfkill_state oldstate; |
344 | ||
f745ba03 HMH |
345 | BUG_ON(!rfkill); |
346 | if (WARN((state >= RFKILL_STATE_MAX), | |
347 | KERN_WARNING | |
348 | "rfkill: illegal state %d passed as parameter " | |
349 | "to rfkill_force_state\n", state)) | |
801e49af HMH |
350 | return -EINVAL; |
351 | ||
352 | mutex_lock(&rfkill->mutex); | |
79399a8d HMH |
353 | |
354 | oldstate = rfkill->state; | |
801e49af | 355 | rfkill->state = state; |
79399a8d HMH |
356 | |
357 | if (state != oldstate) | |
4dec9b80 | 358 | rfkill_uevent(rfkill); |
79399a8d | 359 | |
801e49af HMH |
360 | mutex_unlock(&rfkill->mutex); |
361 | ||
362 | return 0; | |
363 | } | |
364 | EXPORT_SYMBOL(rfkill_force_state); | |
365 | ||
cf4328cd ID |
366 | static ssize_t rfkill_name_show(struct device *dev, |
367 | struct device_attribute *attr, | |
368 | char *buf) | |
369 | { | |
370 | struct rfkill *rfkill = to_rfkill(dev); | |
371 | ||
372 | return sprintf(buf, "%s\n", rfkill->name); | |
373 | } | |
374 | ||
99c632e5 | 375 | static const char *rfkill_get_type_str(enum rfkill_type type) |
cf4328cd | 376 | { |
99c632e5 | 377 | switch (type) { |
cf4328cd | 378 | case RFKILL_TYPE_WLAN: |
99c632e5 | 379 | return "wlan"; |
cf4328cd | 380 | case RFKILL_TYPE_BLUETOOTH: |
99c632e5 | 381 | return "bluetooth"; |
e0665486 | 382 | case RFKILL_TYPE_UWB: |
99c632e5 | 383 | return "ultrawideband"; |
303d9bf6 | 384 | case RFKILL_TYPE_WIMAX: |
99c632e5 | 385 | return "wimax"; |
477576a0 | 386 | case RFKILL_TYPE_WWAN: |
99c632e5 | 387 | return "wwan"; |
cf4328cd ID |
388 | default: |
389 | BUG(); | |
390 | } | |
99c632e5 HMH |
391 | } |
392 | ||
393 | static ssize_t rfkill_type_show(struct device *dev, | |
394 | struct device_attribute *attr, | |
395 | char *buf) | |
396 | { | |
397 | struct rfkill *rfkill = to_rfkill(dev); | |
cf4328cd | 398 | |
99c632e5 | 399 | return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type)); |
cf4328cd ID |
400 | } |
401 | ||
402 | static ssize_t rfkill_state_show(struct device *dev, | |
403 | struct device_attribute *attr, | |
404 | char *buf) | |
405 | { | |
406 | struct rfkill *rfkill = to_rfkill(dev); | |
407 | ||
801e49af | 408 | update_rfkill_state(rfkill); |
cf4328cd ID |
409 | return sprintf(buf, "%d\n", rfkill->state); |
410 | } | |
411 | ||
412 | static ssize_t rfkill_state_store(struct device *dev, | |
413 | struct device_attribute *attr, | |
414 | const char *buf, size_t count) | |
415 | { | |
416 | struct rfkill *rfkill = to_rfkill(dev); | |
849e0576 | 417 | unsigned long state; |
cf4328cd ID |
418 | int error; |
419 | ||
420 | if (!capable(CAP_NET_ADMIN)) | |
421 | return -EPERM; | |
422 | ||
849e0576 HMH |
423 | error = strict_strtoul(buf, 0, &state); |
424 | if (error) | |
425 | return error; | |
426 | ||
5005657c HMH |
427 | /* RFKILL_STATE_HARD_BLOCKED is illegal here... */ |
428 | if (state != RFKILL_STATE_UNBLOCKED && | |
429 | state != RFKILL_STATE_SOFT_BLOCKED) | |
430 | return -EINVAL; | |
431 | ||
cf4b4aab HMH |
432 | error = mutex_lock_killable(&rfkill->mutex); |
433 | if (error) | |
434 | return error; | |
d003922d HMH |
435 | |
436 | if (!rfkill_epo_lock_active) | |
437 | error = rfkill_toggle_radio(rfkill, state, 0); | |
438 | else | |
439 | error = -EPERM; | |
440 | ||
7f4c5341 | 441 | mutex_unlock(&rfkill->mutex); |
cf4328cd | 442 | |
7f4c5341 | 443 | return error ? error : count; |
cf4328cd ID |
444 | } |
445 | ||
446 | static ssize_t rfkill_claim_show(struct device *dev, | |
447 | struct device_attribute *attr, | |
448 | char *buf) | |
449 | { | |
450 | struct rfkill *rfkill = to_rfkill(dev); | |
451 | ||
01b510b9 | 452 | return sprintf(buf, "%d\n", rfkill->user_claim); |
cf4328cd ID |
453 | } |
454 | ||
455 | static ssize_t rfkill_claim_store(struct device *dev, | |
456 | struct device_attribute *attr, | |
457 | const char *buf, size_t count) | |
458 | { | |
459 | struct rfkill *rfkill = to_rfkill(dev); | |
849e0576 HMH |
460 | unsigned long claim_tmp; |
461 | bool claim; | |
cf4328cd ID |
462 | int error; |
463 | ||
464 | if (!capable(CAP_NET_ADMIN)) | |
465 | return -EPERM; | |
466 | ||
064af111 HMH |
467 | if (rfkill->user_claim_unsupported) |
468 | return -EOPNOTSUPP; | |
469 | ||
849e0576 HMH |
470 | error = strict_strtoul(buf, 0, &claim_tmp); |
471 | if (error) | |
472 | return error; | |
473 | claim = !!claim_tmp; | |
474 | ||
cf4328cd ID |
475 | /* |
476 | * Take the global lock to make sure the kernel is not in | |
477 | * the middle of rfkill_switch_all | |
478 | */ | |
cf4b4aab | 479 | error = mutex_lock_killable(&rfkill_global_mutex); |
cf4328cd ID |
480 | if (error) |
481 | return error; | |
482 | ||
483 | if (rfkill->user_claim != claim) { | |
d003922d | 484 | if (!claim && !rfkill_epo_lock_active) { |
064af111 | 485 | mutex_lock(&rfkill->mutex); |
cf4328cd | 486 | rfkill_toggle_radio(rfkill, |
99619201 HMH |
487 | rfkill_global_states[rfkill->type].current_state, |
488 | 0); | |
064af111 HMH |
489 | mutex_unlock(&rfkill->mutex); |
490 | } | |
cf4328cd ID |
491 | rfkill->user_claim = claim; |
492 | } | |
493 | ||
15635744 | 494 | mutex_unlock(&rfkill_global_mutex); |
cf4328cd | 495 | |
20405c08 | 496 | return error ? error : count; |
cf4328cd ID |
497 | } |
498 | ||
499 | static struct device_attribute rfkill_dev_attrs[] = { | |
500 | __ATTR(name, S_IRUGO, rfkill_name_show, NULL), | |
501 | __ATTR(type, S_IRUGO, rfkill_type_show, NULL), | |
c81de6ad | 502 | __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store), |
cf4328cd ID |
503 | __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store), |
504 | __ATTR_NULL | |
505 | }; | |
506 | ||
507 | static void rfkill_release(struct device *dev) | |
508 | { | |
509 | struct rfkill *rfkill = to_rfkill(dev); | |
510 | ||
511 | kfree(rfkill); | |
512 | module_put(THIS_MODULE); | |
513 | } | |
514 | ||
515 | #ifdef CONFIG_PM | |
516 | static int rfkill_suspend(struct device *dev, pm_message_t state) | |
517 | { | |
f80b5e99 HMH |
518 | struct rfkill *rfkill = to_rfkill(dev); |
519 | ||
bed7aac9 HMH |
520 | /* mark class device as suspended */ |
521 | if (dev->power.power_state.event != state.event) | |
cf4328cd | 522 | dev->power.power_state = state; |
cf4328cd | 523 | |
f80b5e99 HMH |
524 | /* store state for the resume handler */ |
525 | rfkill->state_for_resume = rfkill->state; | |
526 | ||
cf4328cd ID |
527 | return 0; |
528 | } | |
529 | ||
530 | static int rfkill_resume(struct device *dev) | |
531 | { | |
532 | struct rfkill *rfkill = to_rfkill(dev); | |
24689c85 | 533 | enum rfkill_state newstate; |
cf4328cd ID |
534 | |
535 | if (dev->power.power_state.event != PM_EVENT_ON) { | |
536 | mutex_lock(&rfkill->mutex); | |
537 | ||
e10e0dfe HMH |
538 | dev->power.power_state.event = PM_EVENT_ON; |
539 | ||
24689c85 HMH |
540 | /* |
541 | * rfkill->state could have been modified before we got | |
542 | * called, and won't be updated by rfkill_toggle_radio() | |
543 | * in force mode. Sync it FIRST. | |
544 | */ | |
545 | if (rfkill->get_state && | |
546 | !rfkill->get_state(rfkill->data, &newstate)) | |
547 | rfkill->state = newstate; | |
548 | ||
17670799 HMH |
549 | /* |
550 | * If we are under EPO, kick transmitter offline, | |
551 | * otherwise restore to pre-suspend state. | |
552 | * | |
553 | * Issue a notification in any case | |
554 | */ | |
555 | rfkill_toggle_radio(rfkill, | |
556 | rfkill_epo_lock_active ? | |
557 | RFKILL_STATE_SOFT_BLOCKED : | |
f80b5e99 | 558 | rfkill->state_for_resume, |
17670799 | 559 | 1); |
cf4328cd ID |
560 | |
561 | mutex_unlock(&rfkill->mutex); | |
562 | } | |
563 | ||
cf4328cd ID |
564 | return 0; |
565 | } | |
566 | #else | |
567 | #define rfkill_suspend NULL | |
568 | #define rfkill_resume NULL | |
569 | #endif | |
570 | ||
ffb67c34 HMH |
571 | static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env) |
572 | { | |
573 | struct rfkill *rfkill = to_rfkill(dev); | |
574 | int error; | |
575 | ||
576 | error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name); | |
577 | if (error) | |
578 | return error; | |
579 | error = add_uevent_var(env, "RFKILL_TYPE=%s", | |
580 | rfkill_get_type_str(rfkill->type)); | |
581 | if (error) | |
582 | return error; | |
583 | error = add_uevent_var(env, "RFKILL_STATE=%d", rfkill->state); | |
584 | return error; | |
585 | } | |
586 | ||
cf4328cd ID |
587 | static struct class rfkill_class = { |
588 | .name = "rfkill", | |
589 | .dev_release = rfkill_release, | |
590 | .dev_attrs = rfkill_dev_attrs, | |
591 | .suspend = rfkill_suspend, | |
592 | .resume = rfkill_resume, | |
ffb67c34 | 593 | .dev_uevent = rfkill_dev_uevent, |
cf4328cd ID |
594 | }; |
595 | ||
02589f60 HMH |
596 | static int rfkill_check_duplicity(const struct rfkill *rfkill) |
597 | { | |
598 | struct rfkill *p; | |
599 | unsigned long seen[BITS_TO_LONGS(RFKILL_TYPE_MAX)]; | |
600 | ||
601 | memset(seen, 0, sizeof(seen)); | |
602 | ||
603 | list_for_each_entry(p, &rfkill_list, node) { | |
f745ba03 HMH |
604 | if (WARN((p == rfkill), KERN_WARNING |
605 | "rfkill: illegal attempt to register " | |
606 | "an already registered rfkill struct\n")) | |
02589f60 | 607 | return -EEXIST; |
02589f60 HMH |
608 | set_bit(p->type, seen); |
609 | } | |
610 | ||
611 | /* 0: first switch of its kind */ | |
4a9d9167 | 612 | return (test_bit(rfkill->type, seen)) ? 1 : 0; |
02589f60 HMH |
613 | } |
614 | ||
cf4328cd ID |
615 | static int rfkill_add_switch(struct rfkill *rfkill) |
616 | { | |
02589f60 HMH |
617 | int error; |
618 | ||
15635744 | 619 | mutex_lock(&rfkill_global_mutex); |
cf4328cd | 620 | |
02589f60 HMH |
621 | error = rfkill_check_duplicity(rfkill); |
622 | if (error < 0) | |
623 | goto unlock_out; | |
624 | ||
99619201 HMH |
625 | if (!error) { |
626 | /* lock default after first use */ | |
627 | set_bit(rfkill->type, rfkill_states_lockdflt); | |
628 | rfkill_global_states[rfkill->type].current_state = | |
629 | rfkill_global_states[rfkill->type].default_state; | |
630 | } | |
631 | ||
632 | rfkill_toggle_radio(rfkill, | |
633 | rfkill_global_states[rfkill->type].current_state, | |
634 | 0); | |
fd4484af HMH |
635 | |
636 | list_add_tail(&rfkill->node, &rfkill_list); | |
cf4328cd | 637 | |
02589f60 HMH |
638 | error = 0; |
639 | unlock_out: | |
15635744 | 640 | mutex_unlock(&rfkill_global_mutex); |
7319f1e6 | 641 | |
02589f60 | 642 | return error; |
cf4328cd ID |
643 | } |
644 | ||
645 | static void rfkill_remove_switch(struct rfkill *rfkill) | |
646 | { | |
15635744 | 647 | mutex_lock(&rfkill_global_mutex); |
cf4328cd | 648 | list_del_init(&rfkill->node); |
15635744 | 649 | mutex_unlock(&rfkill_global_mutex); |
064af111 HMH |
650 | |
651 | mutex_lock(&rfkill->mutex); | |
652 | rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1); | |
653 | mutex_unlock(&rfkill->mutex); | |
cf4328cd ID |
654 | } |
655 | ||
656 | /** | |
657 | * rfkill_allocate - allocate memory for rfkill structure. | |
658 | * @parent: device that has rf switch on it | |
234a0ca6 | 659 | * @type: type of the switch (RFKILL_TYPE_*) |
cf4328cd ID |
660 | * |
661 | * This function should be called by the network driver when it needs | |
435307a3 HMH |
662 | * rfkill structure. Once the structure is allocated the driver should |
663 | * finish its initialization by setting the name, private data, enable_radio | |
cf4328cd | 664 | * and disable_radio methods and then register it with rfkill_register(). |
435307a3 | 665 | * |
cf4328cd ID |
666 | * NOTE: If registration fails the structure shoudl be freed by calling |
667 | * rfkill_free() otherwise rfkill_unregister() should be used. | |
668 | */ | |
77fba13c HMH |
669 | struct rfkill * __must_check rfkill_allocate(struct device *parent, |
670 | enum rfkill_type type) | |
cf4328cd ID |
671 | { |
672 | struct rfkill *rfkill; | |
673 | struct device *dev; | |
674 | ||
f745ba03 HMH |
675 | if (WARN((type >= RFKILL_TYPE_MAX), |
676 | KERN_WARNING | |
677 | "rfkill: illegal type %d passed as parameter " | |
678 | "to rfkill_allocate\n", type)) | |
679 | return NULL; | |
680 | ||
cf4328cd | 681 | rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL); |
d007da1f | 682 | if (!rfkill) |
cf4328cd ID |
683 | return NULL; |
684 | ||
685 | mutex_init(&rfkill->mutex); | |
686 | INIT_LIST_HEAD(&rfkill->node); | |
687 | rfkill->type = type; | |
688 | ||
689 | dev = &rfkill->dev; | |
690 | dev->class = &rfkill_class; | |
691 | dev->parent = parent; | |
692 | device_initialize(dev); | |
693 | ||
694 | __module_get(THIS_MODULE); | |
695 | ||
696 | return rfkill; | |
697 | } | |
698 | EXPORT_SYMBOL(rfkill_allocate); | |
699 | ||
700 | /** | |
701 | * rfkill_free - Mark rfkill structure for deletion | |
702 | * @rfkill: rfkill structure to be destroyed | |
703 | * | |
435307a3 | 704 | * Decrements reference count of the rfkill structure so it is destroyed. |
cf4328cd ID |
705 | * Note that rfkill_free() should _not_ be called after rfkill_unregister(). |
706 | */ | |
707 | void rfkill_free(struct rfkill *rfkill) | |
708 | { | |
709 | if (rfkill) | |
710 | put_device(&rfkill->dev); | |
711 | } | |
712 | EXPORT_SYMBOL(rfkill_free); | |
713 | ||
135900c1 MB |
714 | static void rfkill_led_trigger_register(struct rfkill *rfkill) |
715 | { | |
716 | #ifdef CONFIG_RFKILL_LEDS | |
717 | int error; | |
718 | ||
7c4f4578 | 719 | if (!rfkill->led_trigger.name) |
fb28ad35 | 720 | rfkill->led_trigger.name = dev_name(&rfkill->dev); |
96185664 DB |
721 | if (!rfkill->led_trigger.activate) |
722 | rfkill->led_trigger.activate = rfkill_led_trigger_activate; | |
135900c1 MB |
723 | error = led_trigger_register(&rfkill->led_trigger); |
724 | if (error) | |
725 | rfkill->led_trigger.name = NULL; | |
726 | #endif /* CONFIG_RFKILL_LEDS */ | |
727 | } | |
728 | ||
729 | static void rfkill_led_trigger_unregister(struct rfkill *rfkill) | |
730 | { | |
731 | #ifdef CONFIG_RFKILL_LEDS | |
37f55e9d | 732 | if (rfkill->led_trigger.name) { |
135900c1 | 733 | led_trigger_unregister(&rfkill->led_trigger); |
37f55e9d HMH |
734 | rfkill->led_trigger.name = NULL; |
735 | } | |
135900c1 MB |
736 | #endif |
737 | } | |
738 | ||
cf4328cd ID |
739 | /** |
740 | * rfkill_register - Register a rfkill structure. | |
741 | * @rfkill: rfkill structure to be registered | |
742 | * | |
743 | * This function should be called by the network driver when the rfkill | |
744 | * structure needs to be registered. Immediately from registration the | |
745 | * switch driver should be able to service calls to toggle_radio. | |
746 | */ | |
77fba13c | 747 | int __must_check rfkill_register(struct rfkill *rfkill) |
cf4328cd ID |
748 | { |
749 | static atomic_t rfkill_no = ATOMIC_INIT(0); | |
750 | struct device *dev = &rfkill->dev; | |
751 | int error; | |
752 | ||
f745ba03 HMH |
753 | if (WARN((!rfkill || !rfkill->toggle_radio || |
754 | rfkill->type >= RFKILL_TYPE_MAX || | |
755 | rfkill->state >= RFKILL_STATE_MAX), | |
756 | KERN_WARNING | |
757 | "rfkill: attempt to register a " | |
758 | "badly initialized rfkill struct\n")) | |
96c87607 | 759 | return -EINVAL; |
cf4328cd | 760 | |
fb28ad35 | 761 | dev_set_name(dev, "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1); |
8a8f1c04 MB |
762 | |
763 | rfkill_led_trigger_register(rfkill); | |
764 | ||
cf4328cd | 765 | error = rfkill_add_switch(rfkill); |
632041f3 EP |
766 | if (error) { |
767 | rfkill_led_trigger_unregister(rfkill); | |
cf4328cd | 768 | return error; |
632041f3 | 769 | } |
cf4328cd | 770 | |
cf4328cd ID |
771 | error = device_add(dev); |
772 | if (error) { | |
773 | rfkill_remove_switch(rfkill); | |
37f55e9d | 774 | rfkill_led_trigger_unregister(rfkill); |
cf4328cd ID |
775 | return error; |
776 | } | |
777 | ||
778 | return 0; | |
779 | } | |
780 | EXPORT_SYMBOL(rfkill_register); | |
781 | ||
782 | /** | |
c8fcd905 | 783 | * rfkill_unregister - Unregister a rfkill structure. |
cf4328cd ID |
784 | * @rfkill: rfkill structure to be unregistered |
785 | * | |
786 | * This function should be called by the network driver during device | |
787 | * teardown to destroy rfkill structure. Note that rfkill_free() should | |
788 | * _not_ be called after rfkill_unregister(). | |
789 | */ | |
790 | void rfkill_unregister(struct rfkill *rfkill) | |
791 | { | |
f745ba03 | 792 | BUG_ON(!rfkill); |
cf4328cd ID |
793 | device_del(&rfkill->dev); |
794 | rfkill_remove_switch(rfkill); | |
8a8f1c04 | 795 | rfkill_led_trigger_unregister(rfkill); |
cf4328cd ID |
796 | put_device(&rfkill->dev); |
797 | } | |
798 | EXPORT_SYMBOL(rfkill_unregister); | |
799 | ||
99619201 HMH |
800 | /** |
801 | * rfkill_set_default - set initial value for a switch type | |
802 | * @type - the type of switch to set the default state of | |
803 | * @state - the new default state for that group of switches | |
804 | * | |
805 | * Sets the initial state rfkill should use for a given type. | |
806 | * The following initial states are allowed: RFKILL_STATE_SOFT_BLOCKED | |
807 | * and RFKILL_STATE_UNBLOCKED. | |
808 | * | |
809 | * This function is meant to be used by platform drivers for platforms | |
810 | * that can save switch state across power down/reboot. | |
811 | * | |
812 | * The default state for each switch type can be changed exactly once. | |
813 | * After a switch of that type is registered, the default state cannot | |
814 | * be changed anymore. This guards against multiple drivers it the | |
815 | * same platform trying to set the initial switch default state, which | |
816 | * is not allowed. | |
817 | * | |
818 | * Returns -EPERM if the state has already been set once or is in use, | |
819 | * so drivers likely want to either ignore or at most printk(KERN_NOTICE) | |
820 | * if this function returns -EPERM. | |
821 | * | |
822 | * Returns 0 if the new default state was set, or an error if it | |
823 | * could not be set. | |
824 | */ | |
825 | int rfkill_set_default(enum rfkill_type type, enum rfkill_state state) | |
826 | { | |
827 | int error; | |
828 | ||
f745ba03 HMH |
829 | if (WARN((type >= RFKILL_TYPE_MAX || |
830 | (state != RFKILL_STATE_SOFT_BLOCKED && | |
831 | state != RFKILL_STATE_UNBLOCKED)), | |
832 | KERN_WARNING | |
833 | "rfkill: illegal state %d or type %d passed as " | |
834 | "parameter to rfkill_set_default\n", state, type)) | |
99619201 HMH |
835 | return -EINVAL; |
836 | ||
15635744 | 837 | mutex_lock(&rfkill_global_mutex); |
99619201 HMH |
838 | |
839 | if (!test_and_set_bit(type, rfkill_states_lockdflt)) { | |
840 | rfkill_global_states[type].default_state = state; | |
68d2413b | 841 | rfkill_global_states[type].current_state = state; |
99619201 HMH |
842 | error = 0; |
843 | } else | |
844 | error = -EPERM; | |
845 | ||
15635744 | 846 | mutex_unlock(&rfkill_global_mutex); |
99619201 HMH |
847 | return error; |
848 | } | |
849 | EXPORT_SYMBOL_GPL(rfkill_set_default); | |
850 | ||
cf4328cd ID |
851 | /* |
852 | * Rfkill module initialization/deinitialization. | |
853 | */ | |
854 | static int __init rfkill_init(void) | |
855 | { | |
856 | int error; | |
857 | int i; | |
858 | ||
5005657c HMH |
859 | /* RFKILL_STATE_HARD_BLOCKED is illegal here... */ |
860 | if (rfkill_default_state != RFKILL_STATE_SOFT_BLOCKED && | |
861 | rfkill_default_state != RFKILL_STATE_UNBLOCKED) | |
e954b0b8 HMH |
862 | return -EINVAL; |
863 | ||
99619201 HMH |
864 | for (i = 0; i < RFKILL_TYPE_MAX; i++) |
865 | rfkill_global_states[i].default_state = rfkill_default_state; | |
cf4328cd ID |
866 | |
867 | error = class_register(&rfkill_class); | |
868 | if (error) { | |
869 | printk(KERN_ERR "rfkill: unable to register rfkill class\n"); | |
870 | return error; | |
871 | } | |
872 | ||
873 | return 0; | |
874 | } | |
875 | ||
876 | static void __exit rfkill_exit(void) | |
877 | { | |
878 | class_unregister(&rfkill_class); | |
879 | } | |
880 | ||
2bf236d5 | 881 | subsys_initcall(rfkill_init); |
cf4328cd | 882 | module_exit(rfkill_exit); |