ARM: dts: aspeed: cloudripper: Add comments for "mdio1"
[linux-2.6-microblaze.git] / net / rfkill / input.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Input layer to RF Kill interface connector
4  *
5  * Copyright (c) 2007 Dmitry Torokhov
6  * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
7  *
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".
11  */
12
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>
20
21 #include "rfkill.h"
22
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
28 };
29
30 /* Delay (in ms) between consecutive switch ops */
31 #define RFKILL_OPS_DELAY 200
32
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");
38
39 static DEFINE_SPINLOCK(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)];
43
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,
49 };
50
51 static enum rfkill_sched_op rfkill_master_switch_op;
52 static enum rfkill_sched_op rfkill_op;
53
54 static void __rfkill_handle_global_op(enum rfkill_sched_op op)
55 {
56         unsigned int i;
57
58         switch (op) {
59         case RFKILL_GLOBAL_OP_EPO:
60                 rfkill_epo();
61                 break;
62         case RFKILL_GLOBAL_OP_RESTORE:
63                 rfkill_restore_states();
64                 break;
65         case RFKILL_GLOBAL_OP_UNLOCK:
66                 rfkill_remove_epo_lock();
67                 break;
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);
72                 break;
73         default:
74                 /* memory corruption or bug, fail safely */
75                 rfkill_epo();
76                 WARN(1, "Unknown requested operation %d! "
77                         "rfkill Emergency Power Off activated\n",
78                         op);
79         }
80 }
81
82 static void __rfkill_handle_normal_op(const enum rfkill_type type,
83                                       const bool complement)
84 {
85         bool blocked;
86
87         blocked = rfkill_get_global_sw_state(type);
88         if (complement)
89                 blocked = !blocked;
90
91         rfkill_switch_all(type, blocked);
92 }
93
94 static void rfkill_op_handler(struct work_struct *work)
95 {
96         unsigned int i;
97         bool c;
98
99         spin_lock_irq(&rfkill_op_lock);
100         do {
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);
107
108                         __rfkill_handle_global_op(op);
109
110                         spin_lock_irq(&rfkill_op_lock);
111
112                         /*
113                          * handle global ops first -- during unlocked period
114                          * we might have gotten a new global op.
115                          */
116                         if (rfkill_op_pending)
117                                 continue;
118                 }
119
120                 if (rfkill_is_epo_lock_active())
121                         continue;
122
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);
127
128                                 __rfkill_handle_normal_op(i, c);
129
130                                 spin_lock_irq(&rfkill_op_lock);
131                         }
132                 }
133         } while (rfkill_op_pending);
134         spin_unlock_irq(&rfkill_op_lock);
135 }
136
137 static DECLARE_DELAYED_WORK(rfkill_op_work, rfkill_op_handler);
138 static unsigned long rfkill_last_scheduled;
139
140 static unsigned long rfkill_ratelimit(const unsigned long last)
141 {
142         const unsigned long delay = msecs_to_jiffies(RFKILL_OPS_DELAY);
143         return time_after(jiffies, last + delay) ? 0 : delay;
144 }
145
146 static void rfkill_schedule_ratelimited(void)
147 {
148         if (schedule_delayed_work(&rfkill_op_work,
149                                   rfkill_ratelimit(rfkill_last_scheduled)))
150                 rfkill_last_scheduled = jiffies;
151 }
152
153 static void rfkill_schedule_global_op(enum rfkill_sched_op op)
154 {
155         unsigned long flags;
156
157         spin_lock_irqsave(&rfkill_op_lock, flags);
158         rfkill_op = op;
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;
164         } else
165                 rfkill_schedule_ratelimited();
166         spin_unlock_irqrestore(&rfkill_op_lock, flags);
167 }
168
169 static void rfkill_schedule_toggle(enum rfkill_type type)
170 {
171         unsigned long flags;
172
173         if (rfkill_is_epo_lock_active())
174                 return;
175
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();
181         }
182         spin_unlock_irqrestore(&rfkill_op_lock, flags);
183 }
184
185 static void rfkill_schedule_evsw_rfkillall(int state)
186 {
187         if (state)
188                 rfkill_schedule_global_op(rfkill_master_switch_op);
189         else
190                 rfkill_schedule_global_op(RFKILL_GLOBAL_OP_EPO);
191 }
192
193 static void rfkill_event(struct input_handle *handle, unsigned int type,
194                         unsigned int code, int data)
195 {
196         if (type == EV_KEY && data == 1) {
197                 switch (code) {
198                 case KEY_WLAN:
199                         rfkill_schedule_toggle(RFKILL_TYPE_WLAN);
200                         break;
201                 case KEY_BLUETOOTH:
202                         rfkill_schedule_toggle(RFKILL_TYPE_BLUETOOTH);
203                         break;
204                 case KEY_UWB:
205                         rfkill_schedule_toggle(RFKILL_TYPE_UWB);
206                         break;
207                 case KEY_WIMAX:
208                         rfkill_schedule_toggle(RFKILL_TYPE_WIMAX);
209                         break;
210                 case KEY_RFKILL:
211                         rfkill_schedule_toggle(RFKILL_TYPE_ALL);
212                         break;
213                 }
214         } else if (type == EV_SW && code == SW_RFKILL_ALL)
215                 rfkill_schedule_evsw_rfkillall(data);
216 }
217
218 static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
219                           const struct input_device_id *id)
220 {
221         struct input_handle *handle;
222         int error;
223
224         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
225         if (!handle)
226                 return -ENOMEM;
227
228         handle->dev = dev;
229         handle->handler = handler;
230         handle->name = "rfkill";
231
232         /* causes rfkill_start() to be called */
233         error = input_register_handle(handle);
234         if (error)
235                 goto err_free_handle;
236
237         error = input_open_device(handle);
238         if (error)
239                 goto err_unregister_handle;
240
241         return 0;
242
243  err_unregister_handle:
244         input_unregister_handle(handle);
245  err_free_handle:
246         kfree(handle);
247         return error;
248 }
249
250 static void rfkill_start(struct input_handle *handle)
251 {
252         /*
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).
256          */
257         spin_lock_irq(&handle->dev->event_lock);
258
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,
262                                                         handle->dev->sw));
263
264         spin_unlock_irq(&handle->dev->event_lock);
265 }
266
267 static void rfkill_disconnect(struct input_handle *handle)
268 {
269         input_close_device(handle);
270         input_unregister_handle(handle);
271         kfree(handle);
272 }
273
274 static const struct input_device_id rfkill_ids[] = {
275         {
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) },
279         },
280         {
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) },
284         },
285         {
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) },
289         },
290         {
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) },
294         },
295         {
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) },
299         },
300         {
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) },
304         },
305         { }
306 };
307
308 static struct input_handler rfkill_handler = {
309         .name = "rfkill",
310         .event = rfkill_event,
311         .connect = rfkill_connect,
312         .start = rfkill_start,
313         .disconnect = rfkill_disconnect,
314         .id_table = rfkill_ids,
315 };
316
317 int __init rfkill_handler_init(void)
318 {
319         switch (rfkill_master_switch_mode) {
320         case RFKILL_INPUT_MASTER_UNBLOCKALL:
321                 rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNBLOCK;
322                 break;
323         case RFKILL_INPUT_MASTER_RESTORE:
324                 rfkill_master_switch_op = RFKILL_GLOBAL_OP_RESTORE;
325                 break;
326         case RFKILL_INPUT_MASTER_UNLOCK:
327                 rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNLOCK;
328                 break;
329         default:
330                 return -EINVAL;
331         }
332
333         /* Avoid delay at first schedule */
334         rfkill_last_scheduled =
335                         jiffies - msecs_to_jiffies(RFKILL_OPS_DELAY) - 1;
336         return input_register_handler(&rfkill_handler);
337 }
338
339 void __exit rfkill_handler_exit(void)
340 {
341         input_unregister_handler(&rfkill_handler);
342         cancel_delayed_work_sync(&rfkill_op_work);
343 }