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authorJohannes Berg <johannes@sipsolutions.net>2009-06-02 07:01:37 -0400
committerJohn W. Linville <linville@tuxdriver.com>2009-06-03 14:06:13 -0400
commit19d337dff95cbf76edd3ad95c0cee2732c3e1ec5 (patch)
tree33326eeb09cb9664cc8427a5dc7cd2b08b5a57c3 /net/rfkill
parent0f6399c4c525b518644a9b09f8d6fb125a418c4d (diff)
rfkill: rewrite
This patch completely rewrites the rfkill core to address the following deficiencies: * all rfkill drivers need to implement polling where necessary rather than having one central implementation * updating the rfkill state cannot be done from arbitrary contexts, forcing drivers to use schedule_work and requiring lots of code * rfkill drivers need to keep track of soft/hard blocked internally -- the core should do this * the rfkill API has many unexpected quirks, for example being asymmetric wrt. alloc/free and register/unregister * rfkill can call back into a driver from within a function the driver called -- this is prone to deadlocks and generally should be avoided * rfkill-input pointlessly is a separate module * drivers need to #ifdef rfkill functions (unless they want to depend on or select RFKILL) -- rfkill should provide inlines that do nothing if it isn't compiled in * the rfkill structure is not opaque -- drivers need to initialise it correctly (lots of sanity checking code required) -- instead force drivers to pass the right variables to rfkill_alloc() * the documentation is hard to read because it always assumes the reader is completely clueless and contains way TOO MANY CAPS * the rfkill code needlessly uses a lot of locks and atomic operations in locked sections * fix LED trigger to actually change the LED when the radio state changes -- this wasn't done before Tested-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk> Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> [thinkpad] Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/rfkill')
-rw-r--r--net/rfkill/Kconfig21
-rw-r--r--net/rfkill/Makefile5
-rw-r--r--net/rfkill/core.c896
-rw-r--r--net/rfkill/input.c342
-rw-r--r--net/rfkill/rfkill-input.c390
-rw-r--r--net/rfkill/rfkill.c855
-rw-r--r--net/rfkill/rfkill.h (renamed from net/rfkill/rfkill-input.h)10
7 files changed, 1256 insertions, 1263 deletions
diff --git a/net/rfkill/Kconfig b/net/rfkill/Kconfig
index 7f807b30cfb..b47f72fae05 100644
--- a/net/rfkill/Kconfig
+++ b/net/rfkill/Kconfig
@@ -10,22 +10,15 @@ menuconfig RFKILL
10 To compile this driver as a module, choose M here: the 10 To compile this driver as a module, choose M here: the
11 module will be called rfkill. 11 module will be called rfkill.
12 12
13config RFKILL_INPUT
14 tristate "Input layer to RF switch connector"
15 depends on RFKILL && INPUT
16 help
17 Say Y here if you want kernel automatically toggle state
18 of RF switches on and off when user presses appropriate
19 button or a key on the keyboard. Without this module you
20 need a some kind of userspace application to control
21 state of the switches.
22
23 To compile this driver as a module, choose M here: the
24 module will be called rfkill-input.
25
26# LED trigger support 13# LED trigger support
27config RFKILL_LEDS 14config RFKILL_LEDS
28 bool 15 bool
29 depends on RFKILL && LEDS_TRIGGERS 16 depends on RFKILL
17 depends on LEDS_TRIGGERS = y || RFKILL = LEDS_TRIGGERS
30 default y 18 default y
31 19
20config RFKILL_INPUT
21 bool
22 depends on RFKILL
23 depends on INPUT = y || RFKILL = INPUT
24 default y
diff --git a/net/rfkill/Makefile b/net/rfkill/Makefile
index b38c430be05..66210535269 100644
--- a/net/rfkill/Makefile
+++ b/net/rfkill/Makefile
@@ -2,5 +2,6 @@
2# Makefile for the RF switch subsystem. 2# Makefile for the RF switch subsystem.
3# 3#
4 4
5obj-$(CONFIG_RFKILL) += rfkill.o 5rfkill-y += core.o
6obj-$(CONFIG_RFKILL_INPUT) += rfkill-input.o 6rfkill-$(CONFIG_RFKILL_INPUT) += input.o
7obj-$(CONFIG_RFKILL) += rfkill.o
diff --git a/net/rfkill/core.c b/net/rfkill/core.c
new file mode 100644
index 00000000000..30a6f8d819b
--- /dev/null
+++ b/net/rfkill/core.c
@@ -0,0 +1,896 @@
1/*
2 * Copyright (C) 2006 - 2007 Ivo van Doorn
3 * Copyright (C) 2007 Dmitry Torokhov
4 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the
18 * Free Software Foundation, Inc.,
19 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 */
21
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/workqueue.h>
26#include <linux/capability.h>
27#include <linux/list.h>
28#include <linux/mutex.h>
29#include <linux/rfkill.h>
30#include <linux/spinlock.h>
31
32#include "rfkill.h"
33
34#define POLL_INTERVAL (5 * HZ)
35
36#define RFKILL_BLOCK_HW BIT(0)
37#define RFKILL_BLOCK_SW BIT(1)
38#define RFKILL_BLOCK_SW_PREV BIT(2)
39#define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
40 RFKILL_BLOCK_SW |\
41 RFKILL_BLOCK_SW_PREV)
42#define RFKILL_BLOCK_SW_SETCALL BIT(31)
43
44struct rfkill {
45 spinlock_t lock;
46
47 const char *name;
48 enum rfkill_type type;
49
50 unsigned long state;
51
52 bool registered;
53 bool suspended;
54
55 const struct rfkill_ops *ops;
56 void *data;
57
58#ifdef CONFIG_RFKILL_LEDS
59 struct led_trigger led_trigger;
60 const char *ledtrigname;
61#endif
62
63 struct device dev;
64 struct list_head node;
65
66 struct delayed_work poll_work;
67 struct work_struct uevent_work;
68 struct work_struct sync_work;
69};
70#define to_rfkill(d) container_of(d, struct rfkill, dev)
71
72
73
74MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
75MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
76MODULE_DESCRIPTION("RF switch support");
77MODULE_LICENSE("GPL");
78
79
80/*
81 * The locking here should be made much smarter, we currently have
82 * a bit of a stupid situation because drivers might want to register
83 * the rfkill struct under their own lock, and take this lock during
84 * rfkill method calls -- which will cause an AB-BA deadlock situation.
85 *
86 * To fix that, we need to rework this code here to be mostly lock-free
87 * and only use the mutex for list manipulations, not to protect the
88 * various other global variables. Then we can avoid holding the mutex
89 * around driver operations, and all is happy.
90 */
91static LIST_HEAD(rfkill_list); /* list of registered rf switches */
92static DEFINE_MUTEX(rfkill_global_mutex);
93
94static unsigned int rfkill_default_state = 1;
95module_param_named(default_state, rfkill_default_state, uint, 0444);
96MODULE_PARM_DESC(default_state,
97 "Default initial state for all radio types, 0 = radio off");
98
99static struct {
100 bool cur, def;
101} rfkill_global_states[NUM_RFKILL_TYPES];
102
103static unsigned long rfkill_states_default_locked;
104
105static bool rfkill_epo_lock_active;
106
107
108#ifdef CONFIG_RFKILL_LEDS
109static void rfkill_led_trigger_event(struct rfkill *rfkill)
110{
111 struct led_trigger *trigger;
112
113 if (!rfkill->registered)
114 return;
115
116 trigger = &rfkill->led_trigger;
117
118 if (rfkill->state & RFKILL_BLOCK_ANY)
119 led_trigger_event(trigger, LED_OFF);
120 else
121 led_trigger_event(trigger, LED_FULL);
122}
123
124static void rfkill_led_trigger_activate(struct led_classdev *led)
125{
126 struct rfkill *rfkill;
127
128 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
129
130 rfkill_led_trigger_event(rfkill);
131}
132
133const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
134{
135 return rfkill->led_trigger.name;
136}
137EXPORT_SYMBOL(rfkill_get_led_trigger_name);
138
139void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
140{
141 BUG_ON(!rfkill);
142
143 rfkill->ledtrigname = name;
144}
145EXPORT_SYMBOL(rfkill_set_led_trigger_name);
146
147static int rfkill_led_trigger_register(struct rfkill *rfkill)
148{
149 rfkill->led_trigger.name = rfkill->ledtrigname
150 ? : dev_name(&rfkill->dev);
151 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
152 return led_trigger_register(&rfkill->led_trigger);
153}
154
155static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
156{
157 led_trigger_unregister(&rfkill->led_trigger);
158}
159#else
160static void rfkill_led_trigger_event(struct rfkill *rfkill)
161{
162}
163
164static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
165{
166 return 0;
167}
168
169static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
170{
171}
172#endif /* CONFIG_RFKILL_LEDS */
173
174static void rfkill_uevent(struct rfkill *rfkill)
175{
176 if (!rfkill->registered || rfkill->suspended)
177 return;
178
179 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
180}
181
182static bool __rfkill_set_hw_state(struct rfkill *rfkill,
183 bool blocked, bool *change)
184{
185 unsigned long flags;
186 bool prev, any;
187
188 BUG_ON(!rfkill);
189
190 spin_lock_irqsave(&rfkill->lock, flags);
191 prev = !!(rfkill->state & RFKILL_BLOCK_HW);
192 if (blocked)
193 rfkill->state |= RFKILL_BLOCK_HW;
194 else
195 rfkill->state &= ~RFKILL_BLOCK_HW;
196 *change = prev != blocked;
197 any = rfkill->state & RFKILL_BLOCK_ANY;
198 spin_unlock_irqrestore(&rfkill->lock, flags);
199
200 rfkill_led_trigger_event(rfkill);
201
202 return any;
203}
204
205/**
206 * rfkill_set_block - wrapper for set_block method
207 *
208 * @rfkill: the rfkill struct to use
209 * @blocked: the new software state
210 *
211 * Calls the set_block method (when applicable) and handles notifications
212 * etc. as well.
213 */
214static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
215{
216 unsigned long flags;
217 int err;
218
219 /*
220 * Some platforms (...!) generate input events which affect the
221 * _hard_ kill state -- whenever something tries to change the
222 * current software state query the hardware state too.
223 */
224 if (rfkill->ops->query)
225 rfkill->ops->query(rfkill, rfkill->data);
226
227 spin_lock_irqsave(&rfkill->lock, flags);
228 if (rfkill->state & RFKILL_BLOCK_SW)
229 rfkill->state |= RFKILL_BLOCK_SW_PREV;
230 else
231 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
232
233 if (blocked)
234 rfkill->state |= RFKILL_BLOCK_SW;
235 else
236 rfkill->state &= ~RFKILL_BLOCK_SW;
237
238 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
239 spin_unlock_irqrestore(&rfkill->lock, flags);
240
241 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
242 return;
243
244 err = rfkill->ops->set_block(rfkill->data, blocked);
245
246 spin_lock_irqsave(&rfkill->lock, flags);
247 if (err) {
248 /*
249 * Failed -- reset status to _prev, this may be different
250 * from what set set _PREV to earlier in this function
251 * if rfkill_set_sw_state was invoked.
252 */
253 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
254 rfkill->state |= RFKILL_BLOCK_SW;
255 else
256 rfkill->state &= ~RFKILL_BLOCK_SW;
257 }
258 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
259 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
260 spin_unlock_irqrestore(&rfkill->lock, flags);
261
262 rfkill_led_trigger_event(rfkill);
263 rfkill_uevent(rfkill);
264}
265
266/**
267 * __rfkill_switch_all - Toggle state of all switches of given type
268 * @type: type of interfaces to be affected
269 * @state: the new state
270 *
271 * This function sets the state of all switches of given type,
272 * unless a specific switch is claimed by userspace (in which case,
273 * that switch is left alone) or suspended.
274 *
275 * Caller must have acquired rfkill_global_mutex.
276 */
277static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
278{
279 struct rfkill *rfkill;
280
281 rfkill_global_states[type].cur = blocked;
282 list_for_each_entry(rfkill, &rfkill_list, node) {
283 if (rfkill->type != type)
284 continue;
285
286 rfkill_set_block(rfkill, blocked);
287 }
288}
289
290/**
291 * rfkill_switch_all - Toggle state of all switches of given type
292 * @type: type of interfaces to be affected
293 * @state: the new state
294 *
295 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
296 * Please refer to __rfkill_switch_all() for details.
297 *
298 * Does nothing if the EPO lock is active.
299 */
300void rfkill_switch_all(enum rfkill_type type, bool blocked)
301{
302 mutex_lock(&rfkill_global_mutex);
303
304 if (!rfkill_epo_lock_active)
305 __rfkill_switch_all(type, blocked);
306
307 mutex_unlock(&rfkill_global_mutex);
308}
309
310/**
311 * rfkill_epo - emergency power off all transmitters
312 *
313 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
314 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
315 *
316 * The global state before the EPO is saved and can be restored later
317 * using rfkill_restore_states().
318 */
319void rfkill_epo(void)
320{
321 struct rfkill *rfkill;
322 int i;
323
324 mutex_lock(&rfkill_global_mutex);
325
326 rfkill_epo_lock_active = true;
327 list_for_each_entry(rfkill, &rfkill_list, node)
328 rfkill_set_block(rfkill, true);
329
330 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
331 rfkill_global_states[i].def = rfkill_global_states[i].cur;
332 rfkill_global_states[i].cur = true;
333 }
334 mutex_unlock(&rfkill_global_mutex);
335}
336
337/**
338 * rfkill_restore_states - restore global states
339 *
340 * Restore (and sync switches to) the global state from the
341 * states in rfkill_default_states. This can undo the effects of
342 * a call to rfkill_epo().
343 */
344void rfkill_restore_states(void)
345{
346 int i;
347
348 mutex_lock(&rfkill_global_mutex);
349
350 rfkill_epo_lock_active = false;
351 for (i = 0; i < NUM_RFKILL_TYPES; i++)
352 __rfkill_switch_all(i, rfkill_global_states[i].def);
353 mutex_unlock(&rfkill_global_mutex);
354}
355
356/**
357 * rfkill_remove_epo_lock - unlock state changes
358 *
359 * Used by rfkill-input manually unlock state changes, when
360 * the EPO switch is deactivated.
361 */
362void rfkill_remove_epo_lock(void)
363{
364 mutex_lock(&rfkill_global_mutex);
365 rfkill_epo_lock_active = false;
366 mutex_unlock(&rfkill_global_mutex);
367}
368
369/**
370 * rfkill_is_epo_lock_active - returns true EPO is active
371 *
372 * Returns 0 (false) if there is NOT an active EPO contidion,
373 * and 1 (true) if there is an active EPO contition, which
374 * locks all radios in one of the BLOCKED states.
375 *
376 * Can be called in atomic context.
377 */
378bool rfkill_is_epo_lock_active(void)
379{
380 return rfkill_epo_lock_active;
381}
382
383/**
384 * rfkill_get_global_sw_state - returns global state for a type
385 * @type: the type to get the global state of
386 *
387 * Returns the current global state for a given wireless
388 * device type.
389 */
390bool rfkill_get_global_sw_state(const enum rfkill_type type)
391{
392 return rfkill_global_states[type].cur;
393}
394
395void rfkill_set_global_sw_state(const enum rfkill_type type, bool blocked)
396{
397 mutex_lock(&rfkill_global_mutex);
398
399 /* don't allow unblock when epo */
400 if (rfkill_epo_lock_active && !blocked)
401 goto out;
402
403 /* too late */
404 if (rfkill_states_default_locked & BIT(type))
405 goto out;
406
407 rfkill_states_default_locked |= BIT(type);
408
409 rfkill_global_states[type].cur = blocked;
410 rfkill_global_states[type].def = blocked;
411 out:
412 mutex_unlock(&rfkill_global_mutex);
413}
414EXPORT_SYMBOL(rfkill_set_global_sw_state);
415
416
417bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
418{
419 bool ret, change;
420
421 ret = __rfkill_set_hw_state(rfkill, blocked, &change);
422
423 if (!rfkill->registered)
424 return ret;
425
426 if (change)
427 schedule_work(&rfkill->uevent_work);
428
429 return ret;
430}
431EXPORT_SYMBOL(rfkill_set_hw_state);
432
433static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
434{
435 u32 bit = RFKILL_BLOCK_SW;
436
437 /* if in a ops->set_block right now, use other bit */
438 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
439 bit = RFKILL_BLOCK_SW_PREV;
440
441 if (blocked)
442 rfkill->state |= bit;
443 else
444 rfkill->state &= ~bit;
445}
446
447bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
448{
449 unsigned long flags;
450 bool prev, hwblock;
451
452 BUG_ON(!rfkill);
453
454 spin_lock_irqsave(&rfkill->lock, flags);
455 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
456 __rfkill_set_sw_state(rfkill, blocked);
457 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
458 blocked = blocked || hwblock;
459 spin_unlock_irqrestore(&rfkill->lock, flags);
460
461 if (!rfkill->registered)
462 return blocked;
463
464 if (prev != blocked && !hwblock)
465 schedule_work(&rfkill->uevent_work);
466
467 rfkill_led_trigger_event(rfkill);
468
469 return blocked;
470}
471EXPORT_SYMBOL(rfkill_set_sw_state);
472
473void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
474{
475 unsigned long flags;
476 bool swprev, hwprev;
477
478 BUG_ON(!rfkill);
479
480 spin_lock_irqsave(&rfkill->lock, flags);
481
482 /*
483 * No need to care about prev/setblock ... this is for uevent only
484 * and that will get triggered by rfkill_set_block anyway.
485 */
486 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
487 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
488 __rfkill_set_sw_state(rfkill, sw);
489
490 spin_unlock_irqrestore(&rfkill->lock, flags);
491
492 if (!rfkill->registered)
493 return;
494
495 if (swprev != sw || hwprev != hw)
496 schedule_work(&rfkill->uevent_work);
497
498 rfkill_led_trigger_event(rfkill);
499}
500EXPORT_SYMBOL(rfkill_set_states);
501
502static ssize_t rfkill_name_show(struct device *dev,
503 struct device_attribute *attr,
504 char *buf)
505{
506 struct rfkill *rfkill = to_rfkill(dev);
507
508 return sprintf(buf, "%s\n", rfkill->name);
509}
510
511static const char *rfkill_get_type_str(enum rfkill_type type)
512{
513 switch (type) {
514 case RFKILL_TYPE_WLAN:
515 return "wlan";
516 case RFKILL_TYPE_BLUETOOTH:
517 return "bluetooth";
518 case RFKILL_TYPE_UWB:
519 return "ultrawideband";
520 case RFKILL_TYPE_WIMAX:
521 return "wimax";
522 case RFKILL_TYPE_WWAN:
523 return "wwan";
524 default:
525 BUG();
526 }
527
528 BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_WWAN + 1);
529}
530
531static ssize_t rfkill_type_show(struct device *dev,
532 struct device_attribute *attr,
533 char *buf)
534{
535 struct rfkill *rfkill = to_rfkill(dev);
536
537 return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
538}
539
540static u8 user_state_from_blocked(unsigned long state)
541{
542 if (state & RFKILL_BLOCK_HW)
543 return RFKILL_USER_STATE_HARD_BLOCKED;
544 if (state & RFKILL_BLOCK_SW)
545 return RFKILL_USER_STATE_SOFT_BLOCKED;
546
547 return RFKILL_USER_STATE_UNBLOCKED;
548}
549
550static ssize_t rfkill_state_show(struct device *dev,
551 struct device_attribute *attr,
552 char *buf)
553{
554 struct rfkill *rfkill = to_rfkill(dev);
555 unsigned long flags;
556 u32 state;
557
558 spin_lock_irqsave(&rfkill->lock, flags);
559 state = rfkill->state;
560 spin_unlock_irqrestore(&rfkill->lock, flags);
561
562 return sprintf(buf, "%d\n", user_state_from_blocked(state));
563}
564
565static ssize_t rfkill_state_store(struct device *dev,
566 struct device_attribute *attr,
567 const char *buf, size_t count)
568{
569 /*
570 * The intention was that userspace can only take control over
571 * a given device when/if rfkill-input doesn't control it due
572 * to user_claim. Since user_claim is currently unsupported,
573 * we never support changing the state from userspace -- this
574 * can be implemented again later.
575 */
576
577 return -EPERM;
578}
579
580static ssize_t rfkill_claim_show(struct device *dev,
581 struct device_attribute *attr,
582 char *buf)
583{
584 return sprintf(buf, "%d\n", 0);
585}
586
587static ssize_t rfkill_claim_store(struct device *dev,
588 struct device_attribute *attr,
589 const char *buf, size_t count)
590{
591 return -EOPNOTSUPP;
592}
593
594static struct device_attribute rfkill_dev_attrs[] = {
595 __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
596 __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
597 __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
598 __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
599 __ATTR_NULL
600};
601
602static void rfkill_release(struct device *dev)
603{
604 struct rfkill *rfkill = to_rfkill(dev);
605
606 kfree(rfkill);
607}
608
609static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
610{
611 struct rfkill *rfkill = to_rfkill(dev);
612 unsigned long flags;
613 u32 state;
614 int error;
615
616 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
617 if (error)
618 return error;
619 error = add_uevent_var(env, "RFKILL_TYPE=%s",
620 rfkill_get_type_str(rfkill->type));
621 if (error)
622 return error;
623 spin_lock_irqsave(&rfkill->lock, flags);
624 state = rfkill->state;
625 spin_unlock_irqrestore(&rfkill->lock, flags);
626 error = add_uevent_var(env, "RFKILL_STATE=%d",
627 user_state_from_blocked(state));
628 return error;
629}
630
631void rfkill_pause_polling(struct rfkill *rfkill)
632{
633 BUG_ON(!rfkill);
634
635 if (!rfkill->ops->poll)
636 return;
637
638 cancel_delayed_work_sync(&rfkill->poll_work);
639}
640EXPORT_SYMBOL(rfkill_pause_polling);
641
642void rfkill_resume_polling(struct rfkill *rfkill)
643{
644 BUG_ON(!rfkill);
645
646 if (!rfkill->ops->poll)
647 return;
648
649 schedule_work(&rfkill->poll_work.work);
650}
651EXPORT_SYMBOL(rfkill_resume_polling);
652
653static int rfkill_suspend(struct device *dev, pm_message_t state)
654{
655 struct rfkill *rfkill = to_rfkill(dev);
656
657 rfkill_pause_polling(rfkill);
658
659 rfkill->suspended = true;
660
661 return 0;
662}
663
664static int rfkill_resume(struct device *dev)
665{
666 struct rfkill *rfkill = to_rfkill(dev);
667 bool cur;
668
669 mutex_lock(&rfkill_global_mutex);
670 cur = rfkill_global_states[rfkill->type].cur;
671 rfkill_set_block(rfkill, cur);
672 mutex_unlock(&rfkill_global_mutex);
673
674 rfkill->suspended = false;
675
676 schedule_work(&rfkill->uevent_work);
677
678 rfkill_resume_polling(rfkill);
679
680 return 0;
681}
682
683static struct class rfkill_class = {
684 .name = "rfkill",
685 .dev_release = rfkill_release,
686 .dev_attrs = rfkill_dev_attrs,
687 .dev_uevent = rfkill_dev_uevent,
688 .suspend = rfkill_suspend,
689 .resume = rfkill_resume,
690};
691
692
693struct rfkill * __must_check rfkill_alloc(const char *name,
694 struct device *parent,
695 const enum rfkill_type type,
696 const struct rfkill_ops *ops,
697 void *ops_data)
698{
699 struct rfkill *rfkill;
700 struct device *dev;
701
702 if (WARN_ON(!ops))
703 return NULL;
704
705 if (WARN_ON(!ops->set_block))
706 return NULL;
707
708 if (WARN_ON(!name))
709 return NULL;
710
711 if (WARN_ON(type >= NUM_RFKILL_TYPES))
712 return NULL;
713
714 rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
715 if (!rfkill)
716 return NULL;
717
718 spin_lock_init(&rfkill->lock);
719 INIT_LIST_HEAD(&rfkill->node);
720 rfkill->type = type;
721 rfkill->name = name;
722 rfkill->ops = ops;
723 rfkill->data = ops_data;
724
725 dev = &rfkill->dev;
726 dev->class = &rfkill_class;
727 dev->parent = parent;
728 device_initialize(dev);
729
730 return rfkill;
731}
732EXPORT_SYMBOL(rfkill_alloc);
733
734static void rfkill_poll(struct work_struct *work)
735{
736 struct rfkill *rfkill;
737
738 rfkill = container_of(work, struct rfkill, poll_work.work);
739
740 /*
741 * Poll hardware state -- driver will use one of the
742 * rfkill_set{,_hw,_sw}_state functions and use its
743 * return value to update the current status.
744 */
745 rfkill->ops->poll(rfkill, rfkill->data);
746
747 schedule_delayed_work(&rfkill->poll_work,
748 round_jiffies_relative(POLL_INTERVAL));
749}
750
751static void rfkill_uevent_work(struct work_struct *work)
752{
753 struct rfkill *rfkill;
754
755 rfkill = container_of(work, struct rfkill, uevent_work);
756
757 rfkill_uevent(rfkill);
758}
759
760static void rfkill_sync_work(struct work_struct *work)
761{
762 struct rfkill *rfkill;
763 bool cur;
764
765 rfkill = container_of(work, struct rfkill, sync_work);
766
767 mutex_lock(&rfkill_global_mutex);
768 cur = rfkill_global_states[rfkill->type].cur;
769 rfkill_set_block(rfkill, cur);
770 mutex_unlock(&rfkill_global_mutex);
771}
772
773int __must_check rfkill_register(struct rfkill *rfkill)
774{
775 static unsigned long rfkill_no;
776 struct device *dev = &rfkill->dev;
777 int error;
778
779 BUG_ON(!rfkill);
780
781 mutex_lock(&rfkill_global_mutex);
782
783 if (rfkill->registered) {
784 error = -EALREADY;
785 goto unlock;
786 }
787
788 dev_set_name(dev, "rfkill%lu", rfkill_no);
789 rfkill_no++;
790
791 if (!(rfkill_states_default_locked & BIT(rfkill->type))) {
792 /* first of its kind */
793 BUILD_BUG_ON(NUM_RFKILL_TYPES >
794 sizeof(rfkill_states_default_locked) * 8);
795 rfkill_states_default_locked |= BIT(rfkill->type);
796 rfkill_global_states[rfkill->type].cur =
797 rfkill_global_states[rfkill->type].def;
798 }
799
800 list_add_tail(&rfkill->node, &rfkill_list);
801
802 error = device_add(dev);
803 if (error)
804 goto remove;
805
806 error = rfkill_led_trigger_register(rfkill);
807 if (error)
808 goto devdel;
809
810 rfkill->registered = true;
811
812 if (rfkill->ops->poll) {
813 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
814 schedule_delayed_work(&rfkill->poll_work,
815 round_jiffies_relative(POLL_INTERVAL));
816 }
817
818 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
819
820 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
821 schedule_work(&rfkill->sync_work);
822
823 mutex_unlock(&rfkill_global_mutex);
824 return 0;
825
826 devdel:
827 device_del(&rfkill->dev);
828 remove:
829 list_del_init(&rfkill->node);
830 unlock:
831 mutex_unlock(&rfkill_global_mutex);
832 return error;
833}
834EXPORT_SYMBOL(rfkill_register);
835
836void rfkill_unregister(struct rfkill *rfkill)
837{
838 BUG_ON(!rfkill);
839
840 if (rfkill->ops->poll)
841 cancel_delayed_work_sync(&rfkill->poll_work);
842
843 cancel_work_sync(&rfkill->uevent_work);
844 cancel_work_sync(&rfkill->sync_work);
845
846 rfkill->registered = false;
847
848 device_del(&rfkill->dev);
849
850 mutex_lock(&rfkill_global_mutex);
851 list_del_init(&rfkill->node);
852 mutex_unlock(&rfkill_global_mutex);
853
854 rfkill_led_trigger_unregister(rfkill);
855}
856EXPORT_SYMBOL(rfkill_unregister);
857
858void rfkill_destroy(struct rfkill *rfkill)
859{
860 if (rfkill)
861 put_device(&rfkill->dev);
862}
863EXPORT_SYMBOL(rfkill_destroy);
864
865
866static int __init rfkill_init(void)
867{
868 int error;
869 int i;
870
871 for (i = 0; i < NUM_RFKILL_TYPES; i++)
872 rfkill_global_states[i].def = !rfkill_default_state;
873
874 error = class_register(&rfkill_class);
875 if (error)
876 goto out;
877
878#ifdef CONFIG_RFKILL_INPUT
879 error = rfkill_handler_init();
880 if (error)
881 class_unregister(&rfkill_class);
882#endif
883
884 out:
885 return error;
886}
887subsys_initcall(rfkill_init);
888
889static void __exit rfkill_exit(void)
890{
891#ifdef CONFIG_RFKILL_INPUT
892 rfkill_handler_exit();
893#endif
894 class_unregister(&rfkill_class);
895}
896module_exit(rfkill_exit);
diff --git a/net/rfkill/input.c b/net/rfkill/input.c
new file mode 100644
index 00000000000..a7295ad5f9c
--- /dev/null
+++ b/net/rfkill/input.c
@@ -0,0 +1,342 @@
1/*
2 * Input layer to RF Kill interface connector
3 *
4 * Copyright (c) 2007 Dmitry Torokhov
5 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published
9 * by the Free Software Foundation.
10 *
11 * If you ever run into a situation in which you have a SW_ type rfkill
12 * input device, then you can revive code that was removed in the patch
13 * "rfkill-input: remove unused code".
14 */
15
16#include <linux/input.h>
17#include <linux/slab.h>
18#include <linux/workqueue.h>
19#include <linux/init.h>
20#include <linux/rfkill.h>
21#include <linux/sched.h>
22
23#include "rfkill.h"
24
25enum rfkill_input_master_mode {
26 RFKILL_INPUT_MASTER_UNLOCK = 0,
27 RFKILL_INPUT_MASTER_RESTORE = 1,
28 RFKILL_INPUT_MASTER_UNBLOCKALL = 2,
29 NUM_RFKILL_INPUT_MASTER_MODES
30};
31
32/* Delay (in ms) between consecutive switch ops */
33#define RFKILL_OPS_DELAY 200
34
35static enum rfkill_input_master_mode rfkill_master_switch_mode =
36 RFKILL_INPUT_MASTER_UNBLOCKALL;
37module_param_named(master_switch_mode, rfkill_master_switch_mode, uint, 0);
38MODULE_PARM_DESC(master_switch_mode,
39 "SW_RFKILL_ALL ON should: 0=do nothing (only unlock); 1=restore; 2=unblock all");
40
41static spinlock_t rfkill_op_lock;
42static bool rfkill_op_pending;
43static unsigned long rfkill_sw_pending[BITS_TO_LONGS(NUM_RFKILL_TYPES)];
44static unsigned long rfkill_sw_state[BITS_TO_LONGS(NUM_RFKILL_TYPES)];
45
46enum rfkill_sched_op {
47 RFKILL_GLOBAL_OP_EPO = 0,
48 RFKILL_GLOBAL_OP_RESTORE,
49 RFKILL_GLOBAL_OP_UNLOCK,
50 RFKILL_GLOBAL_OP_UNBLOCK,
51};
52
53static enum rfkill_sched_op rfkill_master_switch_op;
54static enum rfkill_sched_op rfkill_op;
55
56static void __rfkill_handle_global_op(enum rfkill_sched_op op)
57{
58 unsigned int i;
59
60 switch (op) {
61 case RFKILL_GLOBAL_OP_EPO:
62 rfkill_epo();
63 break;
64 case RFKILL_GLOBAL_OP_RESTORE:
65 rfkill_restore_states();
66 break;
67 case RFKILL_GLOBAL_OP_UNLOCK:
68 rfkill_remove_epo_lock();
69 break;
70 case RFKILL_GLOBAL_OP_UNBLOCK:
71 rfkill_remove_epo_lock();
72 for (i = 0; i < NUM_RFKILL_TYPES; i++)
73 rfkill_switch_all(i, false);
74 break;
75 default:
76 /* memory corruption or bug, fail safely */
77 rfkill_epo();
78 WARN(1, "Unknown requested operation %d! "
79 "rfkill Emergency Power Off activated\n",
80 op);
81 }
82}
83
84static void __rfkill_handle_normal_op(const enum rfkill_type type,
85 const bool complement)
86{
87 bool blocked;
88
89 blocked = rfkill_get_global_sw_state(type);
90 if (complement)
91 blocked = !blocked;
92
93 rfkill_switch_all(type, blocked);
94}
95
96static void rfkill_op_handler(struct work_struct *work)
97{
98 unsigned int i;
99 bool c;
100
101 spin_lock_irq(&rfkill_op_lock);
102 do {
103 if (rfkill_op_pending) {
104 enum rfkill_sched_op op = rfkill_op;
105 rfkill_op_pending = false;
106 memset(rfkill_sw_pending, 0,
107 sizeof(rfkill_sw_pending));
108 spin_unlock_irq(&rfkill_op_lock);
109
110 __rfkill_handle_global_op(op);
111
112 spin_lock_irq(&rfkill_op_lock);
113
114 /*
115 * handle global ops first -- during unlocked period
116 * we might have gotten a new global op.
117 */
118 if (rfkill_op_pending)
119 continue;
120 }
121
122 if (rfkill_is_epo_lock_active())
123 continue;
124
125 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
126 if (__test_and_clear_bit(i, rfkill_sw_pending)) {
127 c = __test_and_clear_bit(i, rfkill_sw_state);
128 spin_unlock_irq(&rfkill_op_lock);
129
130 __rfkill_handle_normal_op(i, c);
131
132 spin_lock_irq(&rfkill_op_lock);
133 }
134 }
135 } while (rfkill_op_pending);
136 spin_unlock_irq(&rfkill_op_lock);
137}
138
139static DECLARE_DELAYED_WORK(rfkill_op_work, rfkill_op_handler);
140static unsigned long rfkill_last_scheduled;
141
142static unsigned long rfkill_ratelimit(const unsigned long last)
143{
144 const unsigned long delay = msecs_to_jiffies(RFKILL_OPS_DELAY);
145 return (time_after(jiffies, last + delay)) ? 0 : delay;
146}
147
148static void rfkill_schedule_ratelimited(void)
149{
150 if (delayed_work_pending(&rfkill_op_work))
151 return;
152 schedule_delayed_work(&rfkill_op_work,
153 rfkill_ratelimit(rfkill_last_scheduled));
154 rfkill_last_scheduled = jiffies;
155}
156
157static void rfkill_schedule_global_op(enum rfkill_sched_op op)
158{
159 unsigned long flags;
160
161 spin_lock_irqsave(&rfkill_op_lock, flags);
162 rfkill_op = op;
163 rfkill_op_pending = true;
164 if (op == RFKILL_GLOBAL_OP_EPO && !rfkill_is_epo_lock_active()) {
165 /* bypass the limiter for EPO */
166 cancel_delayed_work(&rfkill_op_work);
167 schedule_delayed_work(&rfkill_op_work, 0);
168 rfkill_last_scheduled = jiffies;
169 } else
170 rfkill_schedule_ratelimited();
171 spin_unlock_irqrestore(&rfkill_op_lock, flags);
172}
173
174static void rfkill_schedule_toggle(enum rfkill_type type)
175{
176 unsigned long flags;
177
178 if (rfkill_is_epo_lock_active())
179 return;
180
181 spin_lock_irqsave(&rfkill_op_lock, flags);
182 if (!rfkill_op_pending) {
183 __set_bit(type, rfkill_sw_pending);
184 __change_bit(type, rfkill_sw_state);
185 rfkill_schedule_ratelimited();
186 }
187 spin_unlock_irqrestore(&rfkill_op_lock, flags);
188}
189
190static void rfkill_schedule_evsw_rfkillall(int state)
191{
192 if (state)
193 rfkill_schedule_global_op(rfkill_master_switch_op);
194 else
195 rfkill_schedule_global_op(RFKILL_GLOBAL_OP_EPO);
196}
197
198static void rfkill_event(struct input_handle *handle, unsigned int type,
199 unsigned int code, int data)
200{
201 if (type == EV_KEY && data == 1) {
202 switch (code) {
203 case KEY_WLAN:
204 rfkill_schedule_toggle(RFKILL_TYPE_WLAN);
205 break;
206 case KEY_BLUETOOTH:
207 rfkill_schedule_toggle(RFKILL_TYPE_BLUETOOTH);
208 break;
209 case KEY_UWB:
210 rfkill_schedule_toggle(RFKILL_TYPE_UWB);
211 break;
212 case KEY_WIMAX:
213 rfkill_schedule_toggle(RFKILL_TYPE_WIMAX);
214 break;
215 }
216 } else if (type == EV_SW && code == SW_RFKILL_ALL)
217 rfkill_schedule_evsw_rfkillall(data);
218}
219
220static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
221 const struct input_device_id *id)
222{
223 struct input_handle *handle;
224 int error;
225
226 handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
227 if (!handle)
228 return -ENOMEM;
229
230 handle->dev = dev;
231 handle->handler = handler;
232 handle->name = "rfkill";
233
234 /* causes rfkill_start() to be called */
235 error = input_register_handle(handle);
236 if (error)
237 goto err_free_handle;
238
239 error = input_open_device(handle);
240 if (error)
241 goto err_unregister_handle;
242
243 return 0;
244
245 err_unregister_handle:
246 input_unregister_handle(handle);
247 err_free_handle:
248 kfree(handle);
249 return error;
250}
251
252static void rfkill_start(struct input_handle *handle)
253{
254 /*
255 * Take event_lock to guard against configuration changes, we
256 * should be able to deal with concurrency with rfkill_event()
257 * just fine (which event_lock will also avoid).
258 */
259 spin_lock_irq(&handle->dev->event_lock);
260
261 if (test_bit(EV_SW, handle->dev->evbit) &&
262 test_bit(SW_RFKILL_ALL, handle->dev->swbit))
263 rfkill_schedule_evsw_rfkillall(test_bit(SW_RFKILL_ALL,
264 handle->dev->sw));
265
266 spin_unlock_irq(&handle->dev->event_lock);
267}
268
269static void rfkill_disconnect(struct input_handle *handle)
270{
271 input_close_device(handle);
272 input_unregister_handle(handle);
273 kfree(handle);
274}
275
276static const struct input_device_id rfkill_ids[] = {
277 {
278 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
279 .evbit = { BIT_MASK(EV_KEY) },
280 .keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
281 },
282 {
283 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
284 .evbit = { BIT_MASK(EV_KEY) },
285 .keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
286 },
287 {
288 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
289 .evbit = { BIT_MASK(EV_KEY) },
290 .keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
291 },
292 {
293 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
294 .evbit = { BIT_MASK(EV_KEY) },
295 .keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
296 },
297 {
298 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_SWBIT,
299 .evbit = { BIT(EV_SW) },
300 .swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
301 },
302 { }
303};
304
305static struct input_handler rfkill_handler = {
306 .name = "rfkill",
307 .event = rfkill_event,
308 .connect = rfkill_connect,
309 .start = rfkill_start,
310 .disconnect = rfkill_disconnect,
311 .id_table = rfkill_ids,
312};
313
314int __init rfkill_handler_init(void)
315{
316 switch (rfkill_master_switch_mode) {
317 case RFKILL_INPUT_MASTER_UNBLOCKALL:
318 rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNBLOCK;
319 break;
320 case RFKILL_INPUT_MASTER_RESTORE:
321 rfkill_master_switch_op = RFKILL_GLOBAL_OP_RESTORE;
322 break;
323 case RFKILL_INPUT_MASTER_UNLOCK:
324 rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNLOCK;
325 break;
326 default:
327 return -EINVAL;
328 }
329
330 spin_lock_init(&rfkill_op_lock);
331
332 /* Avoid delay at first schedule */
333 rfkill_last_scheduled =
334 jiffies - msecs_to_jiffies(RFKILL_OPS_DELAY) - 1;
335 return input_register_handler(&rfkill_handler);
336}
337
338void __exit rfkill_handler_exit(void)
339{
340 input_unregister_handler(&rfkill_handler);
341 cancel_delayed_work_sync(&rfkill_op_work);
342}
diff --git a/net/rfkill/rfkill-input.c b/net/rfkill/rfkill-input.c
deleted file mode 100644
index 60a34f3b5f6..00000000000
--- a/net/rfkill/rfkill-input.c
+++ /dev/null
@@ -1,390 +0,0 @@
1/*
2 * Input layer to RF Kill interface connector
3 *
4 * Copyright (c) 2007 Dmitry Torokhov
5 */
6
7/*
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation.
11 */
12
13#include <linux/module.h>
14#include <linux/input.h>
15#include <linux/slab.h>
16#include <linux/workqueue.h>
17#include <linux/init.h>
18#include <linux/rfkill.h>
19#include <linux/sched.h>
20
21#include "rfkill-input.h"
22
23MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
24MODULE_DESCRIPTION("Input layer to RF switch connector");
25MODULE_LICENSE("GPL");
26
27enum rfkill_input_master_mode {
28 RFKILL_INPUT_MASTER_DONOTHING = 0,
29 RFKILL_INPUT_MASTER_RESTORE = 1,
30 RFKILL_INPUT_MASTER_UNBLOCKALL = 2,
31 RFKILL_INPUT_MASTER_MAX, /* marker */
32};
33
34/* Delay (in ms) between consecutive switch ops */
35#define RFKILL_OPS_DELAY 200
36
37static enum rfkill_input_master_mode rfkill_master_switch_mode =
38 RFKILL_INPUT_MASTER_UNBLOCKALL;
39module_param_named(master_switch_mode, rfkill_master_switch_mode, uint, 0);
40MODULE_PARM_DESC(master_switch_mode,
41 "SW_RFKILL_ALL ON should: 0=do nothing; 1=restore; 2=unblock all");
42
43enum rfkill_global_sched_op {
44 RFKILL_GLOBAL_OP_EPO = 0,
45 RFKILL_GLOBAL_OP_RESTORE,
46 RFKILL_GLOBAL_OP_UNLOCK,
47 RFKILL_GLOBAL_OP_UNBLOCK,
48};
49
50struct rfkill_task {
51 struct delayed_work dwork;
52
53 /* ensures that task is serialized */
54 struct mutex mutex;
55
56 /* protects everything below */
57 spinlock_t lock;
58
59 /* pending regular switch operations (1=pending) */
60 unsigned long sw_pending[BITS_TO_LONGS(RFKILL_TYPE_MAX)];
61
62 /* should the state be complemented (1=yes) */
63 unsigned long sw_togglestate[BITS_TO_LONGS(RFKILL_TYPE_MAX)];
64
65 bool global_op_pending;
66 enum rfkill_global_sched_op op;
67
68 /* last time it was scheduled */
69 unsigned long last_scheduled;
70};
71
72static void __rfkill_handle_global_op(enum rfkill_global_sched_op op)
73{
74 unsigned int i;
75
76 switch (op) {
77 case RFKILL_GLOBAL_OP_EPO:
78 rfkill_epo();
79 break;
80 case RFKILL_GLOBAL_OP_RESTORE:
81 rfkill_restore_states();
82 break;
83 case RFKILL_GLOBAL_OP_UNLOCK:
84 rfkill_remove_epo_lock();
85 break;
86 case RFKILL_GLOBAL_OP_UNBLOCK:
87 rfkill_remove_epo_lock();
88 for (i = 0; i < RFKILL_TYPE_MAX; i++)
89 rfkill_switch_all(i, RFKILL_STATE_UNBLOCKED);
90 break;
91 default:
92 /* memory corruption or bug, fail safely */
93 rfkill_epo();
94 WARN(1, "Unknown requested operation %d! "
95 "rfkill Emergency Power Off activated\n",
96 op);
97 }
98}
99
100static void __rfkill_handle_normal_op(const enum rfkill_type type,
101 const bool c)
102{
103 enum rfkill_state state;
104
105 state = rfkill_get_global_state(type);
106 if (c)
107 state = rfkill_state_complement(state);
108
109 rfkill_switch_all(type, state);
110}
111
112static void rfkill_task_handler(struct work_struct *work)
113{
114 struct rfkill_task *task = container_of(work,
115 struct rfkill_task, dwork.work);
116 bool doit = true;
117
118 mutex_lock(&task->mutex);
119
120 spin_lock_irq(&task->lock);
121 while (doit) {
122 if (task->global_op_pending) {
123 enum rfkill_global_sched_op op = task->op;
124 task->global_op_pending = false;
125 memset(task->sw_pending, 0, sizeof(task->sw_pending));
126 spin_unlock_irq(&task->lock);
127
128 __rfkill_handle_global_op(op);
129
130 /* make sure we do at least one pass with
131 * !task->global_op_pending */
132 spin_lock_irq(&task->lock);
133 continue;
134 } else if (!rfkill_is_epo_lock_active()) {
135 unsigned int i = 0;
136
137 while (!task->global_op_pending &&
138 i < RFKILL_TYPE_MAX) {
139 if (test_and_clear_bit(i, task->sw_pending)) {
140 bool c;
141 c = test_and_clear_bit(i,
142 task->sw_togglestate);
143 spin_unlock_irq(&task->lock);
144
145 __rfkill_handle_normal_op(i, c);
146
147 spin_lock_irq(&task->lock);
148 }
149 i++;
150 }
151 }
152 doit = task->global_op_pending;
153 }
154 spin_unlock_irq(&task->lock);
155
156 mutex_unlock(&task->mutex);
157}
158
159static struct rfkill_task rfkill_task = {
160 .dwork = __DELAYED_WORK_INITIALIZER(rfkill_task.dwork,
161 rfkill_task_handler),
162 .mutex = __MUTEX_INITIALIZER(rfkill_task.mutex),
163 .lock = __SPIN_LOCK_UNLOCKED(rfkill_task.lock),
164};
165
166static unsigned long rfkill_ratelimit(const unsigned long last)
167{
168 const unsigned long delay = msecs_to_jiffies(RFKILL_OPS_DELAY);
169 return (time_after(jiffies, last + delay)) ? 0 : delay;
170}
171
172static void rfkill_schedule_ratelimited(void)
173{
174 if (!delayed_work_pending(&rfkill_task.dwork)) {
175 schedule_delayed_work(&rfkill_task.dwork,
176 rfkill_ratelimit(rfkill_task.last_scheduled));
177 rfkill_task.last_scheduled = jiffies;
178 }
179}
180
181static void rfkill_schedule_global_op(enum rfkill_global_sched_op op)
182{
183 unsigned long flags;
184
185 spin_lock_irqsave(&rfkill_task.lock, flags);
186 rfkill_task.op = op;
187 rfkill_task.global_op_pending = true;
188 if (op == RFKILL_GLOBAL_OP_EPO && !rfkill_is_epo_lock_active()) {
189 /* bypass the limiter for EPO */
190 cancel_delayed_work(&rfkill_task.dwork);
191 schedule_delayed_work(&rfkill_task.dwork, 0);
192 rfkill_task.last_scheduled = jiffies;
193 } else
194 rfkill_schedule_ratelimited();
195 spin_unlock_irqrestore(&rfkill_task.lock, flags);
196}
197
198static void rfkill_schedule_toggle(enum rfkill_type type)
199{
200 unsigned long flags;
201
202 if (rfkill_is_epo_lock_active())
203 return;
204
205 spin_lock_irqsave(&rfkill_task.lock, flags);
206 if (!rfkill_task.global_op_pending) {
207 set_bit(type, rfkill_task.sw_pending);
208 change_bit(type, rfkill_task.sw_togglestate);
209 rfkill_schedule_ratelimited();
210 }
211 spin_unlock_irqrestore(&rfkill_task.lock, flags);
212}
213
214static void rfkill_schedule_evsw_rfkillall(int state)
215{
216 if (state) {
217 switch (rfkill_master_switch_mode) {
218 case RFKILL_INPUT_MASTER_UNBLOCKALL:
219 rfkill_schedule_global_op(RFKILL_GLOBAL_OP_UNBLOCK);
220 break;
221 case RFKILL_INPUT_MASTER_RESTORE:
222 rfkill_schedule_global_op(RFKILL_GLOBAL_OP_RESTORE);
223 break;
224 case RFKILL_INPUT_MASTER_DONOTHING:
225 rfkill_schedule_global_op(RFKILL_GLOBAL_OP_UNLOCK);
226 break;
227 default:
228 /* memory corruption or driver bug! fail safely */
229 rfkill_schedule_global_op(RFKILL_GLOBAL_OP_EPO);
230 WARN(1, "Unknown rfkill_master_switch_mode (%d), "
231 "driver bug or memory corruption detected!\n",
232 rfkill_master_switch_mode);
233 break;
234 }
235 } else
236 rfkill_schedule_global_op(RFKILL_GLOBAL_OP_EPO);
237}
238
239static void rfkill_event(struct input_handle *handle, unsigned int type,
240 unsigned int code, int data)
241{
242 if (type == EV_KEY && data == 1) {
243 enum rfkill_type t;
244
245 switch (code) {
246 case KEY_WLAN:
247 t = RFKILL_TYPE_WLAN;
248 break;
249 case KEY_BLUETOOTH:
250 t = RFKILL_TYPE_BLUETOOTH;
251 break;
252 case KEY_UWB:
253 t = RFKILL_TYPE_UWB;
254 break;
255 case KEY_WIMAX:
256 t = RFKILL_TYPE_WIMAX;
257 break;
258 default:
259 return;
260 }
261 rfkill_schedule_toggle(t);
262 return;
263 } else if (type == EV_SW) {
264 switch (code) {
265 case SW_RFKILL_ALL:
266 rfkill_schedule_evsw_rfkillall(data);
267 return;
268 default:
269 return;
270 }
271 }
272}
273
274static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
275 const struct input_device_id *id)
276{
277 struct input_handle *handle;
278 int error;
279
280 handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
281 if (!handle)
282 return -ENOMEM;
283
284 handle->dev = dev;
285 handle->handler = handler;
286 handle->name = "rfkill";
287
288 /* causes rfkill_start() to be called */
289 error = input_register_handle(handle);
290 if (error)
291 goto err_free_handle;
292
293 error = input_open_device(handle);
294 if (error)
295 goto err_unregister_handle;
296
297 return 0;
298
299 err_unregister_handle:
300 input_unregister_handle(handle);
301 err_free_handle:
302 kfree(handle);
303 return error;
304}
305
306static void rfkill_start(struct input_handle *handle)
307{
308 /* Take event_lock to guard against configuration changes, we
309 * should be able to deal with concurrency with rfkill_event()
310 * just fine (which event_lock will also avoid). */
311 spin_lock_irq(&handle->dev->event_lock);
312
313 if (test_bit(EV_SW, handle->dev->evbit)) {
314 if (test_bit(SW_RFKILL_ALL, handle->dev->swbit))
315 rfkill_schedule_evsw_rfkillall(test_bit(SW_RFKILL_ALL,
316 handle->dev->sw));
317 /* add resync for further EV_SW events here */
318 }
319
320 spin_unlock_irq(&handle->dev->event_lock);
321}
322
323static void rfkill_disconnect(struct input_handle *handle)
324{
325 input_close_device(handle);
326 input_unregister_handle(handle);
327 kfree(handle);
328}
329
330static const struct input_device_id rfkill_ids[] = {
331 {
332 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
333 .evbit = { BIT_MASK(EV_KEY) },
334 .keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
335 },
336 {
337 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
338 .evbit = { BIT_MASK(EV_KEY) },
339 .keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
340 },
341 {
342 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
343 .evbit = { BIT_MASK(EV_KEY) },
344 .keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
345 },
346 {
347 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
348 .evbit = { BIT_MASK(EV_KEY) },
349 .keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
350 },
351 {
352 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_SWBIT,
353 .evbit = { BIT(EV_SW) },
354 .swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
355 },
356 { }
357};
358
359static struct input_handler rfkill_handler = {
360 .event = rfkill_event,
361 .connect = rfkill_connect,
362 .disconnect = rfkill_disconnect,
363 .start = rfkill_start,
364 .name = "rfkill",
365 .id_table = rfkill_ids,
366};
367
368static int __init rfkill_handler_init(void)
369{
370 if (rfkill_master_switch_mode >= RFKILL_INPUT_MASTER_MAX)
371 return -EINVAL;
372
373 /*
374 * The penalty to not doing this is a possible RFKILL_OPS_DELAY delay
375 * at the first use. Acceptable, but if we can avoid it, why not?
376 */
377 rfkill_task.last_scheduled =
378 jiffies - msecs_to_jiffies(RFKILL_OPS_DELAY) - 1;
379 return input_register_handler(&rfkill_handler);
380}
381
382static void __exit rfkill_handler_exit(void)
383{
384 input_unregister_handler(&rfkill_handler);
385 cancel_delayed_work_sync(&rfkill_task.dwork);
386 rfkill_remove_epo_lock();
387}
388
389module_init(rfkill_handler_init);
390module_exit(rfkill_handler_exit);
diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
deleted file mode 100644
index 4f5a83183c9..00000000000
--- a/net/rfkill/rfkill.c
+++ /dev/null
@@ -1,855 +0,0 @@
1/*
2 * Copyright (C) 2006 - 2007 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/* Get declaration of rfkill_switch_all() to shut up sparse. */
31#include "rfkill-input.h"
32
33
34MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
35MODULE_VERSION("1.0");
36MODULE_DESCRIPTION("RF switch support");
37MODULE_LICENSE("GPL");
38
39static LIST_HEAD(rfkill_list); /* list of registered rf switches */
40static DEFINE_MUTEX(rfkill_global_mutex);
41
42static unsigned int rfkill_default_state = RFKILL_STATE_UNBLOCKED;
43module_param_named(default_state, rfkill_default_state, uint, 0444);
44MODULE_PARM_DESC(default_state,
45 "Default initial state for all radio types, 0 = radio off");
46
47struct rfkill_gsw_state {
48 enum rfkill_state current_state;
49 enum rfkill_state default_state;
50};
51
52static struct rfkill_gsw_state rfkill_global_states[RFKILL_TYPE_MAX];
53static unsigned long rfkill_states_lockdflt[BITS_TO_LONGS(RFKILL_TYPE_MAX)];
54static bool rfkill_epo_lock_active;
55
56
57#ifdef CONFIG_RFKILL_LEDS
58static void rfkill_led_trigger(struct rfkill *rfkill,
59 enum rfkill_state state)
60{
61 struct led_trigger *led = &rfkill->led_trigger;
62
63 if (!led->name)
64 return;
65 if (state != RFKILL_STATE_UNBLOCKED)
66 led_trigger_event(led, LED_OFF);
67 else
68 led_trigger_event(led, LED_FULL);
69}
70
71static 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#else
79static inline void rfkill_led_trigger(struct rfkill *rfkill,
80 enum rfkill_state state)
81{
82}
83#endif /* CONFIG_RFKILL_LEDS */
84
85static void rfkill_uevent(struct rfkill *rfkill)
86{
87 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
88}
89
90static void update_rfkill_state(struct rfkill *rfkill)
91{
92 enum rfkill_state newstate, oldstate;
93
94 if (rfkill->get_state) {
95 mutex_lock(&rfkill->mutex);
96 if (!rfkill->get_state(rfkill->data, &newstate)) {
97 oldstate = rfkill->state;
98 rfkill->state = newstate;
99 if (oldstate != newstate)
100 rfkill_uevent(rfkill);
101 }
102 mutex_unlock(&rfkill->mutex);
103 }
104 rfkill_led_trigger(rfkill, rfkill->state);
105}
106
107/**
108 * rfkill_toggle_radio - wrapper for toggle_radio hook
109 * @rfkill: the rfkill struct to use
110 * @force: calls toggle_radio even if cache says it is not needed,
111 * and also makes sure notifications of the state will be
112 * sent even if it didn't change
113 * @state: the new state to call toggle_radio() with
114 *
115 * Calls rfkill->toggle_radio, enforcing the API for toggle_radio
116 * calls and handling all the red tape such as issuing notifications
117 * if the call is successful.
118 *
119 * Suspended devices are not touched at all, and -EAGAIN is returned.
120 *
121 * Note that the @force parameter cannot override a (possibly cached)
122 * state of RFKILL_STATE_HARD_BLOCKED. Any device making use of
123 * RFKILL_STATE_HARD_BLOCKED implements either get_state() or
124 * rfkill_force_state(), so the cache either is bypassed or valid.
125 *
126 * Note that we do call toggle_radio for RFKILL_STATE_SOFT_BLOCKED
127 * even if the radio is in RFKILL_STATE_HARD_BLOCKED state, so as to
128 * give the driver a hint that it should double-BLOCK the transmitter.
129 *
130 * Caller must have acquired rfkill->mutex.
131 */
132static int rfkill_toggle_radio(struct rfkill *rfkill,
133 enum rfkill_state state,
134 int force)
135{
136 int retval = 0;
137 enum rfkill_state oldstate, newstate;
138
139 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
140 return -EBUSY;
141
142 oldstate = rfkill->state;
143
144 if (rfkill->get_state && !force &&
145 !rfkill->get_state(rfkill->data, &newstate)) {
146 rfkill->state = newstate;
147 }
148
149 switch (state) {
150 case RFKILL_STATE_HARD_BLOCKED:
151 /* typically happens when refreshing hardware state,
152 * such as on resume */
153 state = RFKILL_STATE_SOFT_BLOCKED;
154 break;
155 case RFKILL_STATE_UNBLOCKED:
156 /* force can't override this, only rfkill_force_state() can */
157 if (rfkill->state == RFKILL_STATE_HARD_BLOCKED)
158 return -EPERM;
159 break;
160 case RFKILL_STATE_SOFT_BLOCKED:
161 /* nothing to do, we want to give drivers the hint to double
162 * BLOCK even a transmitter that is already in state
163 * RFKILL_STATE_HARD_BLOCKED */
164 break;
165 default:
166 WARN(1, KERN_WARNING
167 "rfkill: illegal state %d passed as parameter "
168 "to rfkill_toggle_radio\n", state);
169 return -EINVAL;
170 }
171
172 if (force || state != rfkill->state) {
173 retval = rfkill->toggle_radio(rfkill->data, state);
174 /* never allow a HARD->SOFT downgrade! */
175 if (!retval && rfkill->state != RFKILL_STATE_HARD_BLOCKED)
176 rfkill->state = state;
177 }
178
179 if (force || rfkill->state != oldstate)
180 rfkill_uevent(rfkill);
181
182 rfkill_led_trigger(rfkill, rfkill->state);
183 return retval;
184}
185
186/**
187 * __rfkill_switch_all - Toggle state of all switches of given type
188 * @type: type of interfaces to be affected
189 * @state: the new state
190 *
191 * This function toggles the state of all switches of given type,
192 * unless a specific switch is claimed by userspace (in which case,
193 * that switch is left alone) or suspended.
194 *
195 * Caller must have acquired rfkill_global_mutex.
196 */
197static void __rfkill_switch_all(const enum rfkill_type type,
198 const enum rfkill_state state)
199{
200 struct rfkill *rfkill;
201
202 if (WARN((state >= RFKILL_STATE_MAX || type >= RFKILL_TYPE_MAX),
203 KERN_WARNING
204 "rfkill: illegal state %d or type %d "
205 "passed as parameter to __rfkill_switch_all\n",
206 state, type))
207 return;
208
209 rfkill_global_states[type].current_state = state;
210 list_for_each_entry(rfkill, &rfkill_list, node) {
211 if (rfkill->type == type) {
212 mutex_lock(&rfkill->mutex);
213 rfkill_toggle_radio(rfkill, state, 0);
214 mutex_unlock(&rfkill->mutex);
215 rfkill_led_trigger(rfkill, rfkill->state);
216 }
217 }
218}
219
220/**
221 * rfkill_switch_all - Toggle state of all switches of given type
222 * @type: type of interfaces to be affected
223 * @state: the new state
224 *
225 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
226 * Please refer to __rfkill_switch_all() for details.
227 *
228 * Does nothing if the EPO lock is active.
229 */
230void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
231{
232 mutex_lock(&rfkill_global_mutex);
233 if (!rfkill_epo_lock_active)
234 __rfkill_switch_all(type, state);
235 mutex_unlock(&rfkill_global_mutex);
236}
237EXPORT_SYMBOL(rfkill_switch_all);
238
239/**
240 * rfkill_epo - emergency power off all transmitters
241 *
242 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
243 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
244 *
245 * The global state before the EPO is saved and can be restored later
246 * using rfkill_restore_states().
247 */
248void rfkill_epo(void)
249{
250 struct rfkill *rfkill;
251 int i;
252
253 mutex_lock(&rfkill_global_mutex);
254
255 rfkill_epo_lock_active = true;
256 list_for_each_entry(rfkill, &rfkill_list, node) {
257 mutex_lock(&rfkill->mutex);
258 rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
259 mutex_unlock(&rfkill->mutex);
260 }
261 for (i = 0; i < RFKILL_TYPE_MAX; i++) {
262 rfkill_global_states[i].default_state =
263 rfkill_global_states[i].current_state;
264 rfkill_global_states[i].current_state =
265 RFKILL_STATE_SOFT_BLOCKED;
266 }
267 mutex_unlock(&rfkill_global_mutex);
268 rfkill_led_trigger(rfkill, rfkill->state);
269}
270EXPORT_SYMBOL_GPL(rfkill_epo);
271
272/**
273 * rfkill_restore_states - restore global states
274 *
275 * Restore (and sync switches to) the global state from the
276 * states in rfkill_default_states. This can undo the effects of
277 * a call to rfkill_epo().
278 */
279void rfkill_restore_states(void)
280{
281 int i;
282
283 mutex_lock(&rfkill_global_mutex);
284
285 rfkill_epo_lock_active = false;
286 for (i = 0; i < RFKILL_TYPE_MAX; i++)
287 __rfkill_switch_all(i, rfkill_global_states[i].default_state);
288 mutex_unlock(&rfkill_global_mutex);
289}
290EXPORT_SYMBOL_GPL(rfkill_restore_states);
291
292/**
293 * rfkill_remove_epo_lock - unlock state changes
294 *
295 * Used by rfkill-input manually unlock state changes, when
296 * the EPO switch is deactivated.
297 */
298void rfkill_remove_epo_lock(void)
299{
300 mutex_lock(&rfkill_global_mutex);
301 rfkill_epo_lock_active = false;
302 mutex_unlock(&rfkill_global_mutex);
303}
304EXPORT_SYMBOL_GPL(rfkill_remove_epo_lock);
305
306/**
307 * rfkill_is_epo_lock_active - returns true EPO is active
308 *
309 * Returns 0 (false) if there is NOT an active EPO contidion,
310 * and 1 (true) if there is an active EPO contition, which
311 * locks all radios in one of the BLOCKED states.
312 *
313 * Can be called in atomic context.
314 */
315bool rfkill_is_epo_lock_active(void)
316{
317 return rfkill_epo_lock_active;
318}
319EXPORT_SYMBOL_GPL(rfkill_is_epo_lock_active);
320
321/**
322 * rfkill_get_global_state - returns global state for a type
323 * @type: the type to get the global state of
324 *
325 * Returns the current global state for a given wireless
326 * device type.
327 */
328enum rfkill_state rfkill_get_global_state(const enum rfkill_type type)
329{
330 return rfkill_global_states[type].current_state;
331}
332EXPORT_SYMBOL_GPL(rfkill_get_global_state);
333
334/**
335 * rfkill_force_state - Force the internal rfkill radio state
336 * @rfkill: pointer to the rfkill class to modify.
337 * @state: the current radio state the class should be forced to.
338 *
339 * This function updates the internal state of the radio cached
340 * by the rfkill class. It should be used when the driver gets
341 * a notification by the firmware/hardware of the current *real*
342 * state of the radio rfkill switch.
343 *
344 * Devices which are subject to external changes on their rfkill
345 * state (such as those caused by a hardware rfkill line) MUST
346 * have their driver arrange to call rfkill_force_state() as soon
347 * as possible after such a change.
348 *
349 * This function may not be called from an atomic context.
350 */
351int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state)
352{
353 enum rfkill_state oldstate;
354
355 BUG_ON(!rfkill);
356 if (WARN((state >= RFKILL_STATE_MAX),
357 KERN_WARNING
358 "rfkill: illegal state %d passed as parameter "
359 "to rfkill_force_state\n", state))
360 return -EINVAL;
361
362 mutex_lock(&rfkill->mutex);
363
364 oldstate = rfkill->state;
365 rfkill->state = state;
366
367 if (state != oldstate)
368 rfkill_uevent(rfkill);
369
370 mutex_unlock(&rfkill->mutex);
371 rfkill_led_trigger(rfkill, rfkill->state);
372
373 return 0;
374}
375EXPORT_SYMBOL(rfkill_force_state);
376
377static ssize_t rfkill_name_show(struct device *dev,
378 struct device_attribute *attr,
379 char *buf)
380{
381 struct rfkill *rfkill = to_rfkill(dev);
382
383 return sprintf(buf, "%s\n", rfkill->name);
384}
385
386static const char *rfkill_get_type_str(enum rfkill_type type)
387{
388 switch (type) {
389 case RFKILL_TYPE_WLAN:
390 return "wlan";
391 case RFKILL_TYPE_BLUETOOTH:
392 return "bluetooth";
393 case RFKILL_TYPE_UWB:
394 return "ultrawideband";
395 case RFKILL_TYPE_WIMAX:
396 return "wimax";
397 case RFKILL_TYPE_WWAN:
398 return "wwan";
399 default:
400 BUG();
401 }
402}
403
404static ssize_t rfkill_type_show(struct device *dev,
405 struct device_attribute *attr,
406 char *buf)
407{
408 struct rfkill *rfkill = to_rfkill(dev);
409
410 return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
411}
412
413static ssize_t rfkill_state_show(struct device *dev,
414 struct device_attribute *attr,
415 char *buf)
416{
417 struct rfkill *rfkill = to_rfkill(dev);
418
419 update_rfkill_state(rfkill);
420 return sprintf(buf, "%d\n", rfkill->state);
421}
422
423static ssize_t rfkill_state_store(struct device *dev,
424 struct device_attribute *attr,
425 const char *buf, size_t count)
426{
427 struct rfkill *rfkill = to_rfkill(dev);
428 unsigned long state;
429 int error;
430
431 if (!capable(CAP_NET_ADMIN))
432 return -EPERM;
433
434 error = strict_strtoul(buf, 0, &state);
435 if (error)
436 return error;
437
438 /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
439 if (state != RFKILL_STATE_UNBLOCKED &&
440 state != RFKILL_STATE_SOFT_BLOCKED)
441 return -EINVAL;
442
443 error = mutex_lock_killable(&rfkill->mutex);
444 if (error)
445 return error;
446
447 if (!rfkill_epo_lock_active)
448 error = rfkill_toggle_radio(rfkill, state, 0);
449 else
450 error = -EPERM;
451
452 mutex_unlock(&rfkill->mutex);
453
454 return error ? error : count;
455}
456
457static ssize_t rfkill_claim_show(struct device *dev,
458 struct device_attribute *attr,
459 char *buf)
460{
461 return sprintf(buf, "%d\n", 0);
462}
463
464static ssize_t rfkill_claim_store(struct device *dev,
465 struct device_attribute *attr,
466 const char *buf, size_t count)
467{
468 return -EOPNOTSUPP;
469}
470
471static struct device_attribute rfkill_dev_attrs[] = {
472 __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
473 __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
474 __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
475 __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
476 __ATTR_NULL
477};
478
479static void rfkill_release(struct device *dev)
480{
481 struct rfkill *rfkill = to_rfkill(dev);
482
483 kfree(rfkill);
484 module_put(THIS_MODULE);
485}
486
487#ifdef CONFIG_PM
488static int rfkill_suspend(struct device *dev, pm_message_t state)
489{
490 struct rfkill *rfkill = to_rfkill(dev);
491
492 /* mark class device as suspended */
493 if (dev->power.power_state.event != state.event)
494 dev->power.power_state = state;
495
496 /* store state for the resume handler */
497 rfkill->state_for_resume = rfkill->state;
498
499 return 0;
500}
501
502static int rfkill_resume(struct device *dev)
503{
504 struct rfkill *rfkill = to_rfkill(dev);
505 enum rfkill_state newstate;
506
507 if (dev->power.power_state.event != PM_EVENT_ON) {
508 mutex_lock(&rfkill->mutex);
509
510 dev->power.power_state.event = PM_EVENT_ON;
511
512 /*
513 * rfkill->state could have been modified before we got
514 * called, and won't be updated by rfkill_toggle_radio()
515 * in force mode. Sync it FIRST.
516 */
517 if (rfkill->get_state &&
518 !rfkill->get_state(rfkill->data, &newstate))
519 rfkill->state = newstate;
520
521 /*
522 * If we are under EPO, kick transmitter offline,
523 * otherwise restore to pre-suspend state.
524 *
525 * Issue a notification in any case
526 */
527 rfkill_toggle_radio(rfkill,
528 rfkill_epo_lock_active ?
529 RFKILL_STATE_SOFT_BLOCKED :
530 rfkill->state_for_resume,
531 1);
532
533 mutex_unlock(&rfkill->mutex);
534 rfkill_led_trigger(rfkill, rfkill->state);
535 }
536
537 return 0;
538}
539#else
540#define rfkill_suspend NULL
541#define rfkill_resume NULL
542#endif
543
544static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
545{
546 struct rfkill *rfkill = to_rfkill(dev);
547 int error;
548
549 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
550 if (error)
551 return error;
552 error = add_uevent_var(env, "RFKILL_TYPE=%s",
553 rfkill_get_type_str(rfkill->type));
554 if (error)
555 return error;
556 error = add_uevent_var(env, "RFKILL_STATE=%d", rfkill->state);
557 return error;
558}
559
560static struct class rfkill_class = {
561 .name = "rfkill",
562 .dev_release = rfkill_release,
563 .dev_attrs = rfkill_dev_attrs,
564 .suspend = rfkill_suspend,
565 .resume = rfkill_resume,
566 .dev_uevent = rfkill_dev_uevent,
567};
568
569static int rfkill_check_duplicity(const struct rfkill *rfkill)
570{
571 struct rfkill *p;
572 unsigned long seen[BITS_TO_LONGS(RFKILL_TYPE_MAX)];
573
574 memset(seen, 0, sizeof(seen));
575
576 list_for_each_entry(p, &rfkill_list, node) {
577 if (WARN((p == rfkill), KERN_WARNING
578 "rfkill: illegal attempt to register "
579 "an already registered rfkill struct\n"))
580 return -EEXIST;
581 set_bit(p->type, seen);
582 }
583
584 /* 0: first switch of its kind */
585 return (test_bit(rfkill->type, seen)) ? 1 : 0;
586}
587
588static int rfkill_add_switch(struct rfkill *rfkill)
589{
590 int error;
591
592 mutex_lock(&rfkill_global_mutex);
593
594 error = rfkill_check_duplicity(rfkill);
595 if (error < 0)
596 goto unlock_out;
597
598 if (!error) {
599 /* lock default after first use */
600 set_bit(rfkill->type, rfkill_states_lockdflt);
601 rfkill_global_states[rfkill->type].current_state =
602 rfkill_global_states[rfkill->type].default_state;
603 }
604
605 rfkill_toggle_radio(rfkill,
606 rfkill_global_states[rfkill->type].current_state,
607 0);
608
609 list_add_tail(&rfkill->node, &rfkill_list);
610
611 error = 0;
612unlock_out:
613 mutex_unlock(&rfkill_global_mutex);
614
615 return error;
616}
617
618static void rfkill_remove_switch(struct rfkill *rfkill)
619{
620 mutex_lock(&rfkill_global_mutex);
621 list_del_init(&rfkill->node);
622 mutex_unlock(&rfkill_global_mutex);
623
624 mutex_lock(&rfkill->mutex);
625 rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
626 mutex_unlock(&rfkill->mutex);
627}
628
629/**
630 * rfkill_allocate - allocate memory for rfkill structure.
631 * @parent: device that has rf switch on it
632 * @type: type of the switch (RFKILL_TYPE_*)
633 *
634 * This function should be called by the network driver when it needs
635 * rfkill structure. Once the structure is allocated the driver should
636 * finish its initialization by setting the name, private data, enable_radio
637 * and disable_radio methods and then register it with rfkill_register().
638 *
639 * NOTE: If registration fails the structure shoudl be freed by calling
640 * rfkill_free() otherwise rfkill_unregister() should be used.
641 */
642struct rfkill * __must_check rfkill_allocate(struct device *parent,
643 enum rfkill_type type)
644{
645 struct rfkill *rfkill;
646 struct device *dev;
647
648 if (WARN((type >= RFKILL_TYPE_MAX),
649 KERN_WARNING
650 "rfkill: illegal type %d passed as parameter "
651 "to rfkill_allocate\n", type))
652 return NULL;
653
654 rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL);
655 if (!rfkill)
656 return NULL;
657
658 mutex_init(&rfkill->mutex);
659 INIT_LIST_HEAD(&rfkill->node);
660 rfkill->type = type;
661
662 dev = &rfkill->dev;
663 dev->class = &rfkill_class;
664 dev->parent = parent;
665 device_initialize(dev);
666
667 __module_get(THIS_MODULE);
668
669 return rfkill;
670}
671EXPORT_SYMBOL(rfkill_allocate);
672
673/**
674 * rfkill_free - Mark rfkill structure for deletion
675 * @rfkill: rfkill structure to be destroyed
676 *
677 * Decrements reference count of the rfkill structure so it is destroyed.
678 * Note that rfkill_free() should _not_ be called after rfkill_unregister().
679 */
680void rfkill_free(struct rfkill *rfkill)
681{
682 if (rfkill)
683 put_device(&rfkill->dev);
684}
685EXPORT_SYMBOL(rfkill_free);
686
687static void rfkill_led_trigger_register(struct rfkill *rfkill)
688{
689#ifdef CONFIG_RFKILL_LEDS
690 int error;
691
692 if (!rfkill->led_trigger.name)
693 rfkill->led_trigger.name = dev_name(&rfkill->dev);
694 if (!rfkill->led_trigger.activate)
695 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
696 error = led_trigger_register(&rfkill->led_trigger);
697 if (error)
698 rfkill->led_trigger.name = NULL;
699#endif /* CONFIG_RFKILL_LEDS */
700}
701
702static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
703{
704#ifdef CONFIG_RFKILL_LEDS
705 if (rfkill->led_trigger.name) {
706 led_trigger_unregister(&rfkill->led_trigger);
707 rfkill->led_trigger.name = NULL;
708 }
709#endif
710}
711
712/**
713 * rfkill_register - Register a rfkill structure.
714 * @rfkill: rfkill structure to be registered
715 *
716 * This function should be called by the network driver when the rfkill
717 * structure needs to be registered. Immediately from registration the
718 * switch driver should be able to service calls to toggle_radio.
719 */
720int __must_check rfkill_register(struct rfkill *rfkill)
721{
722 static atomic_t rfkill_no = ATOMIC_INIT(0);
723 struct device *dev = &rfkill->dev;
724 int error;
725
726 if (WARN((!rfkill || !rfkill->toggle_radio ||
727 rfkill->type >= RFKILL_TYPE_MAX ||
728 rfkill->state >= RFKILL_STATE_MAX),
729 KERN_WARNING
730 "rfkill: attempt to register a "
731 "badly initialized rfkill struct\n"))
732 return -EINVAL;
733
734 dev_set_name(dev, "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
735
736 rfkill_led_trigger_register(rfkill);
737
738 error = rfkill_add_switch(rfkill);
739 if (error) {
740 rfkill_led_trigger_unregister(rfkill);
741 return error;
742 }
743
744 error = device_add(dev);
745 if (error) {
746 rfkill_remove_switch(rfkill);
747 rfkill_led_trigger_unregister(rfkill);
748 return error;
749 }
750
751 return 0;
752}
753EXPORT_SYMBOL(rfkill_register);
754
755/**
756 * rfkill_unregister - Unregister a rfkill structure.
757 * @rfkill: rfkill structure to be unregistered
758 *
759 * This function should be called by the network driver during device
760 * teardown to destroy rfkill structure. Note that rfkill_free() should
761 * _not_ be called after rfkill_unregister().
762 */
763void rfkill_unregister(struct rfkill *rfkill)
764{
765 BUG_ON(!rfkill);
766 device_del(&rfkill->dev);
767 rfkill_remove_switch(rfkill);
768 rfkill_led_trigger_unregister(rfkill);
769 put_device(&rfkill->dev);
770}
771EXPORT_SYMBOL(rfkill_unregister);
772
773/**
774 * rfkill_set_default - set initial value for a switch type
775 * @type - the type of switch to set the default state of
776 * @state - the new default state for that group of switches
777 *
778 * Sets the initial state rfkill should use for a given type.
779 * The following initial states are allowed: RFKILL_STATE_SOFT_BLOCKED
780 * and RFKILL_STATE_UNBLOCKED.
781 *
782 * This function is meant to be used by platform drivers for platforms
783 * that can save switch state across power down/reboot.
784 *
785 * The default state for each switch type can be changed exactly once.
786 * After a switch of that type is registered, the default state cannot
787 * be changed anymore. This guards against multiple drivers it the
788 * same platform trying to set the initial switch default state, which
789 * is not allowed.
790 *
791 * Returns -EPERM if the state has already been set once or is in use,
792 * so drivers likely want to either ignore or at most printk(KERN_NOTICE)
793 * if this function returns -EPERM.
794 *
795 * Returns 0 if the new default state was set, or an error if it
796 * could not be set.
797 */
798int rfkill_set_default(enum rfkill_type type, enum rfkill_state state)
799{
800 int error;
801
802 if (WARN((type >= RFKILL_TYPE_MAX ||
803 (state != RFKILL_STATE_SOFT_BLOCKED &&
804 state != RFKILL_STATE_UNBLOCKED)),
805 KERN_WARNING
806 "rfkill: illegal state %d or type %d passed as "
807 "parameter to rfkill_set_default\n", state, type))
808 return -EINVAL;
809
810 mutex_lock(&rfkill_global_mutex);
811
812 if (!test_and_set_bit(type, rfkill_states_lockdflt)) {
813 rfkill_global_states[type].default_state = state;
814 rfkill_global_states[type].current_state = state;
815 error = 0;
816 } else
817 error = -EPERM;
818
819 mutex_unlock(&rfkill_global_mutex);
820 return error;
821}
822EXPORT_SYMBOL_GPL(rfkill_set_default);
823
824/*
825 * Rfkill module initialization/deinitialization.
826 */
827static int __init rfkill_init(void)
828{
829 int error;
830 int i;
831
832 /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
833 if (rfkill_default_state != RFKILL_STATE_SOFT_BLOCKED &&
834 rfkill_default_state != RFKILL_STATE_UNBLOCKED)
835 return -EINVAL;
836
837 for (i = 0; i < RFKILL_TYPE_MAX; i++)
838 rfkill_global_states[i].default_state = rfkill_default_state;
839
840 error = class_register(&rfkill_class);
841 if (error) {
842 printk(KERN_ERR "rfkill: unable to register rfkill class\n");
843 return error;
844 }
845
846 return 0;
847}
848
849static void __exit rfkill_exit(void)
850{
851 class_unregister(&rfkill_class);
852}
853
854subsys_initcall(rfkill_init);
855module_exit(rfkill_exit);
diff --git a/net/rfkill/rfkill-input.h b/net/rfkill/rfkill.h
index fe8df6b5b93..d1117cb6e4d 100644
--- a/net/rfkill/rfkill-input.h
+++ b/net/rfkill/rfkill.h
@@ -1,5 +1,6 @@
1/* 1/*
2 * Copyright (C) 2007 Ivo van Doorn 2 * Copyright (C) 2007 Ivo van Doorn
3 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
3 */ 4 */
4 5
5/* 6/*
@@ -11,11 +12,16 @@
11#ifndef __RFKILL_INPUT_H 12#ifndef __RFKILL_INPUT_H
12#define __RFKILL_INPUT_H 13#define __RFKILL_INPUT_H
13 14
14void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state); 15/* core code */
16void rfkill_switch_all(const enum rfkill_type type, bool blocked);
15void rfkill_epo(void); 17void rfkill_epo(void);
16void rfkill_restore_states(void); 18void rfkill_restore_states(void);
17void rfkill_remove_epo_lock(void); 19void rfkill_remove_epo_lock(void);
18bool rfkill_is_epo_lock_active(void); 20bool rfkill_is_epo_lock_active(void);
19enum rfkill_state rfkill_get_global_state(const enum rfkill_type type); 21bool rfkill_get_global_sw_state(const enum rfkill_type type);
22
23/* input handler */
24int rfkill_handler_init(void);
25void rfkill_handler_exit(void);
20 26
21#endif /* __RFKILL_INPUT_H */ 27#endif /* __RFKILL_INPUT_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-17 09:18:01 -0400