2 * Copyright (C) 2006 - 2007 Ivo van Doorn
3 * Copyright (C) 2007 Dmitry Torokhov
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.
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.
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.
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>
30 /* Get declaration of rfkill_switch_all() to shut up sparse. */
31 #include "rfkill-input.h"
34 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
35 MODULE_VERSION("1.0");
36 MODULE_DESCRIPTION("RF switch support");
37 MODULE_LICENSE("GPL");
39 static LIST_HEAD(rfkill_list
); /* list of registered rf switches */
40 static DEFINE_MUTEX(rfkill_mutex
);
42 static enum rfkill_state rfkill_states
[RFKILL_TYPE_MAX
];
45 static void rfkill_led_trigger(struct rfkill
*rfkill
,
46 enum rfkill_state state
)
48 #ifdef CONFIG_RFKILL_LEDS
49 struct led_trigger
*led
= &rfkill
->led_trigger
;
53 if (state
== RFKILL_STATE_OFF
)
54 led_trigger_event(led
, LED_OFF
);
56 led_trigger_event(led
, LED_FULL
);
57 #endif /* CONFIG_RFKILL_LEDS */
60 static int rfkill_toggle_radio(struct rfkill
*rfkill
,
61 enum rfkill_state state
)
65 retval
= mutex_lock_interruptible(&rfkill
->mutex
);
69 if (state
!= rfkill
->state
) {
70 retval
= rfkill
->toggle_radio(rfkill
->data
, state
);
72 rfkill
->state
= state
;
73 rfkill_led_trigger(rfkill
, state
);
77 mutex_unlock(&rfkill
->mutex
);
82 * rfkill_switch_all - Toggle state of all switches of given type
83 * @type: type of interfaces to be affeceted
84 * @state: the new state
86 * This function toggles state of all switches of given type unless
87 * a specific switch is claimed by userspace in which case it is
91 void rfkill_switch_all(enum rfkill_type type
, enum rfkill_state state
)
93 struct rfkill
*rfkill
;
95 mutex_lock(&rfkill_mutex
);
97 rfkill_states
[type
] = state
;
99 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
100 if (!rfkill
->user_claim
)
101 rfkill_toggle_radio(rfkill
, state
);
104 mutex_unlock(&rfkill_mutex
);
106 EXPORT_SYMBOL(rfkill_switch_all
);
108 static ssize_t
rfkill_name_show(struct device
*dev
,
109 struct device_attribute
*attr
,
112 struct rfkill
*rfkill
= to_rfkill(dev
);
114 return sprintf(buf
, "%s\n", rfkill
->name
);
117 static ssize_t
rfkill_type_show(struct device
*dev
,
118 struct device_attribute
*attr
,
121 struct rfkill
*rfkill
= to_rfkill(dev
);
124 switch (rfkill
->type
) {
125 case RFKILL_TYPE_WLAN
:
128 case RFKILL_TYPE_BLUETOOTH
:
131 case RFKILL_TYPE_UWB
:
132 type
= "ultrawideband";
138 return sprintf(buf
, "%s\n", type
);
141 static ssize_t
rfkill_state_show(struct device
*dev
,
142 struct device_attribute
*attr
,
145 struct rfkill
*rfkill
= to_rfkill(dev
);
147 return sprintf(buf
, "%d\n", rfkill
->state
);
150 static ssize_t
rfkill_state_store(struct device
*dev
,
151 struct device_attribute
*attr
,
152 const char *buf
, size_t count
)
154 struct rfkill
*rfkill
= to_rfkill(dev
);
155 unsigned int state
= simple_strtoul(buf
, NULL
, 0);
158 if (!capable(CAP_NET_ADMIN
))
161 error
= rfkill_toggle_radio(rfkill
,
162 state
? RFKILL_STATE_ON
: RFKILL_STATE_OFF
);
169 static ssize_t
rfkill_claim_show(struct device
*dev
,
170 struct device_attribute
*attr
,
173 struct rfkill
*rfkill
= to_rfkill(dev
);
175 return sprintf(buf
, "%d", rfkill
->user_claim
);
178 static ssize_t
rfkill_claim_store(struct device
*dev
,
179 struct device_attribute
*attr
,
180 const char *buf
, size_t count
)
182 struct rfkill
*rfkill
= to_rfkill(dev
);
183 bool claim
= !!simple_strtoul(buf
, NULL
, 0);
186 if (!capable(CAP_NET_ADMIN
))
190 * Take the global lock to make sure the kernel is not in
191 * the middle of rfkill_switch_all
193 error
= mutex_lock_interruptible(&rfkill_mutex
);
197 if (rfkill
->user_claim_unsupported
) {
201 if (rfkill
->user_claim
!= claim
) {
203 rfkill_toggle_radio(rfkill
,
204 rfkill_states
[rfkill
->type
]);
205 rfkill
->user_claim
= claim
;
209 mutex_unlock(&rfkill_mutex
);
211 return error
? error
: count
;
214 static struct device_attribute rfkill_dev_attrs
[] = {
215 __ATTR(name
, S_IRUGO
, rfkill_name_show
, NULL
),
216 __ATTR(type
, S_IRUGO
, rfkill_type_show
, NULL
),
217 __ATTR(state
, S_IRUGO
|S_IWUSR
, rfkill_state_show
, rfkill_state_store
),
218 __ATTR(claim
, S_IRUGO
|S_IWUSR
, rfkill_claim_show
, rfkill_claim_store
),
222 static void rfkill_release(struct device
*dev
)
224 struct rfkill
*rfkill
= to_rfkill(dev
);
227 module_put(THIS_MODULE
);
231 static int rfkill_suspend(struct device
*dev
, pm_message_t state
)
233 struct rfkill
*rfkill
= to_rfkill(dev
);
235 if (dev
->power
.power_state
.event
!= state
.event
) {
236 if (state
.event
== PM_EVENT_SUSPEND
) {
237 mutex_lock(&rfkill
->mutex
);
239 if (rfkill
->state
== RFKILL_STATE_ON
)
240 rfkill
->toggle_radio(rfkill
->data
,
243 mutex_unlock(&rfkill
->mutex
);
246 dev
->power
.power_state
= state
;
252 static int rfkill_resume(struct device
*dev
)
254 struct rfkill
*rfkill
= to_rfkill(dev
);
256 if (dev
->power
.power_state
.event
!= PM_EVENT_ON
) {
257 mutex_lock(&rfkill
->mutex
);
259 if (rfkill
->state
== RFKILL_STATE_ON
)
260 rfkill
->toggle_radio(rfkill
->data
, RFKILL_STATE_ON
);
262 mutex_unlock(&rfkill
->mutex
);
265 dev
->power
.power_state
= PMSG_ON
;
269 #define rfkill_suspend NULL
270 #define rfkill_resume NULL
273 static struct class rfkill_class
= {
275 .dev_release
= rfkill_release
,
276 .dev_attrs
= rfkill_dev_attrs
,
277 .suspend
= rfkill_suspend
,
278 .resume
= rfkill_resume
,
281 static int rfkill_add_switch(struct rfkill
*rfkill
)
285 mutex_lock(&rfkill_mutex
);
287 error
= rfkill_toggle_radio(rfkill
, rfkill_states
[rfkill
->type
]);
289 list_add_tail(&rfkill
->node
, &rfkill_list
);
291 mutex_unlock(&rfkill_mutex
);
296 static void rfkill_remove_switch(struct rfkill
*rfkill
)
298 mutex_lock(&rfkill_mutex
);
299 list_del_init(&rfkill
->node
);
300 rfkill_toggle_radio(rfkill
, RFKILL_STATE_OFF
);
301 mutex_unlock(&rfkill_mutex
);
305 * rfkill_allocate - allocate memory for rfkill structure.
306 * @parent: device that has rf switch on it
307 * @type: type of the switch (RFKILL_TYPE_*)
309 * This function should be called by the network driver when it needs
310 * rfkill structure. Once the structure is allocated the driver shoud
311 * finish its initialization by setting name, private data, enable_radio
312 * and disable_radio methods and then register it with rfkill_register().
313 * NOTE: If registration fails the structure shoudl be freed by calling
314 * rfkill_free() otherwise rfkill_unregister() should be used.
316 struct rfkill
*rfkill_allocate(struct device
*parent
, enum rfkill_type type
)
318 struct rfkill
*rfkill
;
321 rfkill
= kzalloc(sizeof(struct rfkill
), GFP_KERNEL
);
325 mutex_init(&rfkill
->mutex
);
326 INIT_LIST_HEAD(&rfkill
->node
);
330 dev
->class = &rfkill_class
;
331 dev
->parent
= parent
;
332 device_initialize(dev
);
334 __module_get(THIS_MODULE
);
338 EXPORT_SYMBOL(rfkill_allocate
);
341 * rfkill_free - Mark rfkill structure for deletion
342 * @rfkill: rfkill structure to be destroyed
344 * Decrements reference count of rfkill structure so it is destoryed.
345 * Note that rfkill_free() should _not_ be called after rfkill_unregister().
347 void rfkill_free(struct rfkill
*rfkill
)
350 put_device(&rfkill
->dev
);
352 EXPORT_SYMBOL(rfkill_free
);
354 static void rfkill_led_trigger_register(struct rfkill
*rfkill
)
356 #ifdef CONFIG_RFKILL_LEDS
359 rfkill
->led_trigger
.name
= rfkill
->dev
.bus_id
;
360 error
= led_trigger_register(&rfkill
->led_trigger
);
362 rfkill
->led_trigger
.name
= NULL
;
363 #endif /* CONFIG_RFKILL_LEDS */
366 static void rfkill_led_trigger_unregister(struct rfkill
*rfkill
)
368 #ifdef CONFIG_RFKILL_LEDS
369 if (rfkill
->led_trigger
.name
)
370 led_trigger_unregister(&rfkill
->led_trigger
);
375 * rfkill_register - Register a rfkill structure.
376 * @rfkill: rfkill structure to be registered
378 * This function should be called by the network driver when the rfkill
379 * structure needs to be registered. Immediately from registration the
380 * switch driver should be able to service calls to toggle_radio.
382 int rfkill_register(struct rfkill
*rfkill
)
384 static atomic_t rfkill_no
= ATOMIC_INIT(0);
385 struct device
*dev
= &rfkill
->dev
;
388 if (!rfkill
->toggle_radio
)
390 if (rfkill
->type
>= RFKILL_TYPE_MAX
)
393 snprintf(dev
->bus_id
, sizeof(dev
->bus_id
),
394 "rfkill%ld", (long)atomic_inc_return(&rfkill_no
) - 1);
396 rfkill_led_trigger_register(rfkill
);
398 error
= rfkill_add_switch(rfkill
);
402 error
= device_add(dev
);
404 rfkill_remove_switch(rfkill
);
410 EXPORT_SYMBOL(rfkill_register
);
413 * rfkill_unregister - Uegister a rfkill structure.
414 * @rfkill: rfkill structure to be unregistered
416 * This function should be called by the network driver during device
417 * teardown to destroy rfkill structure. Note that rfkill_free() should
418 * _not_ be called after rfkill_unregister().
420 void rfkill_unregister(struct rfkill
*rfkill
)
422 device_del(&rfkill
->dev
);
423 rfkill_remove_switch(rfkill
);
424 rfkill_led_trigger_unregister(rfkill
);
425 put_device(&rfkill
->dev
);
427 EXPORT_SYMBOL(rfkill_unregister
);
430 * Rfkill module initialization/deinitialization.
432 static int __init
rfkill_init(void)
437 for (i
= 0; i
< ARRAY_SIZE(rfkill_states
); i
++)
438 rfkill_states
[i
] = RFKILL_STATE_ON
;
440 error
= class_register(&rfkill_class
);
442 printk(KERN_ERR
"rfkill: unable to register rfkill class\n");
449 static void __exit
rfkill_exit(void)
451 class_unregister(&rfkill_class
);
454 subsys_initcall(rfkill_init
);
455 module_exit(rfkill_exit
);