1 // SPDX-License-Identifier: GPL-2.0-only
3 * Input layer to RF Kill interface connector
5 * Copyright (c) 2007 Dmitry Torokhov
6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
8 * If you ever run into a situation in which you have a SW_ type rfkill
9 * input device, then you can revive code that was removed in the patch
10 * "rfkill-input: remove unused code".
13 #include <linux/input.h>
14 #include <linux/slab.h>
15 #include <linux/moduleparam.h>
16 #include <linux/workqueue.h>
17 #include <linux/init.h>
18 #include <linux/rfkill.h>
19 #include <linux/sched.h>
23 enum rfkill_input_master_mode
{
24 RFKILL_INPUT_MASTER_UNLOCK
= 0,
25 RFKILL_INPUT_MASTER_RESTORE
= 1,
26 RFKILL_INPUT_MASTER_UNBLOCKALL
= 2,
27 NUM_RFKILL_INPUT_MASTER_MODES
30 /* Delay (in ms) between consecutive switch ops */
31 #define RFKILL_OPS_DELAY 200
33 static enum rfkill_input_master_mode rfkill_master_switch_mode
=
34 RFKILL_INPUT_MASTER_UNBLOCKALL
;
35 module_param_named(master_switch_mode
, rfkill_master_switch_mode
, uint
, 0);
36 MODULE_PARM_DESC(master_switch_mode
,
37 "SW_RFKILL_ALL ON should: 0=do nothing (only unlock); 1=restore; 2=unblock all");
39 static spinlock_t rfkill_op_lock
;
40 static bool rfkill_op_pending
;
41 static unsigned long rfkill_sw_pending
[BITS_TO_LONGS(NUM_RFKILL_TYPES
)];
42 static unsigned long rfkill_sw_state
[BITS_TO_LONGS(NUM_RFKILL_TYPES
)];
44 enum rfkill_sched_op
{
45 RFKILL_GLOBAL_OP_EPO
= 0,
46 RFKILL_GLOBAL_OP_RESTORE
,
47 RFKILL_GLOBAL_OP_UNLOCK
,
48 RFKILL_GLOBAL_OP_UNBLOCK
,
51 static enum rfkill_sched_op rfkill_master_switch_op
;
52 static enum rfkill_sched_op rfkill_op
;
54 static void __rfkill_handle_global_op(enum rfkill_sched_op op
)
59 case RFKILL_GLOBAL_OP_EPO
:
62 case RFKILL_GLOBAL_OP_RESTORE
:
63 rfkill_restore_states();
65 case RFKILL_GLOBAL_OP_UNLOCK
:
66 rfkill_remove_epo_lock();
68 case RFKILL_GLOBAL_OP_UNBLOCK
:
69 rfkill_remove_epo_lock();
70 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++)
71 rfkill_switch_all(i
, false);
74 /* memory corruption or bug, fail safely */
76 WARN(1, "Unknown requested operation %d! "
77 "rfkill Emergency Power Off activated\n",
82 static void __rfkill_handle_normal_op(const enum rfkill_type type
,
83 const bool complement
)
87 blocked
= rfkill_get_global_sw_state(type
);
91 rfkill_switch_all(type
, blocked
);
94 static void rfkill_op_handler(struct work_struct
*work
)
99 spin_lock_irq(&rfkill_op_lock
);
101 if (rfkill_op_pending
) {
102 enum rfkill_sched_op op
= rfkill_op
;
103 rfkill_op_pending
= false;
104 memset(rfkill_sw_pending
, 0,
105 sizeof(rfkill_sw_pending
));
106 spin_unlock_irq(&rfkill_op_lock
);
108 __rfkill_handle_global_op(op
);
110 spin_lock_irq(&rfkill_op_lock
);
113 * handle global ops first -- during unlocked period
114 * we might have gotten a new global op.
116 if (rfkill_op_pending
)
120 if (rfkill_is_epo_lock_active())
123 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++) {
124 if (__test_and_clear_bit(i
, rfkill_sw_pending
)) {
125 c
= __test_and_clear_bit(i
, rfkill_sw_state
);
126 spin_unlock_irq(&rfkill_op_lock
);
128 __rfkill_handle_normal_op(i
, c
);
130 spin_lock_irq(&rfkill_op_lock
);
133 } while (rfkill_op_pending
);
134 spin_unlock_irq(&rfkill_op_lock
);
137 static DECLARE_DELAYED_WORK(rfkill_op_work
, rfkill_op_handler
);
138 static unsigned long rfkill_last_scheduled
;
140 static unsigned long rfkill_ratelimit(const unsigned long last
)
142 const unsigned long delay
= msecs_to_jiffies(RFKILL_OPS_DELAY
);
143 return time_after(jiffies
, last
+ delay
) ? 0 : delay
;
146 static void rfkill_schedule_ratelimited(void)
148 if (schedule_delayed_work(&rfkill_op_work
,
149 rfkill_ratelimit(rfkill_last_scheduled
)))
150 rfkill_last_scheduled
= jiffies
;
153 static void rfkill_schedule_global_op(enum rfkill_sched_op op
)
157 spin_lock_irqsave(&rfkill_op_lock
, flags
);
159 rfkill_op_pending
= true;
160 if (op
== RFKILL_GLOBAL_OP_EPO
&& !rfkill_is_epo_lock_active()) {
161 /* bypass the limiter for EPO */
162 mod_delayed_work(system_wq
, &rfkill_op_work
, 0);
163 rfkill_last_scheduled
= jiffies
;
165 rfkill_schedule_ratelimited();
166 spin_unlock_irqrestore(&rfkill_op_lock
, flags
);
169 static void rfkill_schedule_toggle(enum rfkill_type type
)
173 if (rfkill_is_epo_lock_active())
176 spin_lock_irqsave(&rfkill_op_lock
, flags
);
177 if (!rfkill_op_pending
) {
178 __set_bit(type
, rfkill_sw_pending
);
179 __change_bit(type
, rfkill_sw_state
);
180 rfkill_schedule_ratelimited();
182 spin_unlock_irqrestore(&rfkill_op_lock
, flags
);
185 static void rfkill_schedule_evsw_rfkillall(int state
)
188 rfkill_schedule_global_op(rfkill_master_switch_op
);
190 rfkill_schedule_global_op(RFKILL_GLOBAL_OP_EPO
);
193 static void rfkill_event(struct input_handle
*handle
, unsigned int type
,
194 unsigned int code
, int data
)
196 if (type
== EV_KEY
&& data
== 1) {
199 rfkill_schedule_toggle(RFKILL_TYPE_WLAN
);
202 rfkill_schedule_toggle(RFKILL_TYPE_BLUETOOTH
);
205 rfkill_schedule_toggle(RFKILL_TYPE_UWB
);
208 rfkill_schedule_toggle(RFKILL_TYPE_WIMAX
);
211 rfkill_schedule_toggle(RFKILL_TYPE_ALL
);
214 } else if (type
== EV_SW
&& code
== SW_RFKILL_ALL
)
215 rfkill_schedule_evsw_rfkillall(data
);
218 static int rfkill_connect(struct input_handler
*handler
, struct input_dev
*dev
,
219 const struct input_device_id
*id
)
221 struct input_handle
*handle
;
224 handle
= kzalloc(sizeof(struct input_handle
), GFP_KERNEL
);
229 handle
->handler
= handler
;
230 handle
->name
= "rfkill";
232 /* causes rfkill_start() to be called */
233 error
= input_register_handle(handle
);
235 goto err_free_handle
;
237 error
= input_open_device(handle
);
239 goto err_unregister_handle
;
243 err_unregister_handle
:
244 input_unregister_handle(handle
);
250 static void rfkill_start(struct input_handle
*handle
)
253 * Take event_lock to guard against configuration changes, we
254 * should be able to deal with concurrency with rfkill_event()
255 * just fine (which event_lock will also avoid).
257 spin_lock_irq(&handle
->dev
->event_lock
);
259 if (test_bit(EV_SW
, handle
->dev
->evbit
) &&
260 test_bit(SW_RFKILL_ALL
, handle
->dev
->swbit
))
261 rfkill_schedule_evsw_rfkillall(test_bit(SW_RFKILL_ALL
,
264 spin_unlock_irq(&handle
->dev
->event_lock
);
267 static void rfkill_disconnect(struct input_handle
*handle
)
269 input_close_device(handle
);
270 input_unregister_handle(handle
);
274 static const struct input_device_id rfkill_ids
[] = {
276 .flags
= INPUT_DEVICE_ID_MATCH_EVBIT
| INPUT_DEVICE_ID_MATCH_KEYBIT
,
277 .evbit
= { BIT_MASK(EV_KEY
) },
278 .keybit
= { [BIT_WORD(KEY_WLAN
)] = BIT_MASK(KEY_WLAN
) },
281 .flags
= INPUT_DEVICE_ID_MATCH_EVBIT
| INPUT_DEVICE_ID_MATCH_KEYBIT
,
282 .evbit
= { BIT_MASK(EV_KEY
) },
283 .keybit
= { [BIT_WORD(KEY_BLUETOOTH
)] = BIT_MASK(KEY_BLUETOOTH
) },
286 .flags
= INPUT_DEVICE_ID_MATCH_EVBIT
| INPUT_DEVICE_ID_MATCH_KEYBIT
,
287 .evbit
= { BIT_MASK(EV_KEY
) },
288 .keybit
= { [BIT_WORD(KEY_UWB
)] = BIT_MASK(KEY_UWB
) },
291 .flags
= INPUT_DEVICE_ID_MATCH_EVBIT
| INPUT_DEVICE_ID_MATCH_KEYBIT
,
292 .evbit
= { BIT_MASK(EV_KEY
) },
293 .keybit
= { [BIT_WORD(KEY_WIMAX
)] = BIT_MASK(KEY_WIMAX
) },
296 .flags
= INPUT_DEVICE_ID_MATCH_EVBIT
| INPUT_DEVICE_ID_MATCH_KEYBIT
,
297 .evbit
= { BIT_MASK(EV_KEY
) },
298 .keybit
= { [BIT_WORD(KEY_RFKILL
)] = BIT_MASK(KEY_RFKILL
) },
301 .flags
= INPUT_DEVICE_ID_MATCH_EVBIT
| INPUT_DEVICE_ID_MATCH_SWBIT
,
302 .evbit
= { BIT(EV_SW
) },
303 .swbit
= { [BIT_WORD(SW_RFKILL_ALL
)] = BIT_MASK(SW_RFKILL_ALL
) },
308 static struct input_handler rfkill_handler
= {
310 .event
= rfkill_event
,
311 .connect
= rfkill_connect
,
312 .start
= rfkill_start
,
313 .disconnect
= rfkill_disconnect
,
314 .id_table
= rfkill_ids
,
317 int __init
rfkill_handler_init(void)
319 switch (rfkill_master_switch_mode
) {
320 case RFKILL_INPUT_MASTER_UNBLOCKALL
:
321 rfkill_master_switch_op
= RFKILL_GLOBAL_OP_UNBLOCK
;
323 case RFKILL_INPUT_MASTER_RESTORE
:
324 rfkill_master_switch_op
= RFKILL_GLOBAL_OP_RESTORE
;
326 case RFKILL_INPUT_MASTER_UNLOCK
:
327 rfkill_master_switch_op
= RFKILL_GLOBAL_OP_UNLOCK
;
333 spin_lock_init(&rfkill_op_lock
);
335 /* Avoid delay at first schedule */
336 rfkill_last_scheduled
=
337 jiffies
- msecs_to_jiffies(RFKILL_OPS_DELAY
) - 1;
338 return input_register_handler(&rfkill_handler
);
341 void __exit
rfkill_handler_exit(void)
343 input_unregister_handler(&rfkill_handler
);
344 cancel_delayed_work_sync(&rfkill_op_work
);