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Linux/net/rfkill/input.c

  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/moduleparam.h>
 19 #include <linux/workqueue.h>
 20 #include <linux/init.h>
 21 #include <linux/rfkill.h>
 22 #include <linux/sched.h>
 23 
 24 #include "rfkill.h"
 25 
 26 enum rfkill_input_master_mode {
 27         RFKILL_INPUT_MASTER_UNLOCK = 0,
 28         RFKILL_INPUT_MASTER_RESTORE = 1,
 29         RFKILL_INPUT_MASTER_UNBLOCKALL = 2,
 30         NUM_RFKILL_INPUT_MASTER_MODES
 31 };
 32 
 33 /* Delay (in ms) between consecutive switch ops */
 34 #define RFKILL_OPS_DELAY 200
 35 
 36 static enum rfkill_input_master_mode rfkill_master_switch_mode =
 37                                         RFKILL_INPUT_MASTER_UNBLOCKALL;
 38 module_param_named(master_switch_mode, rfkill_master_switch_mode, uint, 0);
 39 MODULE_PARM_DESC(master_switch_mode,
 40         "SW_RFKILL_ALL ON should: 0=do nothing (only unlock); 1=restore; 2=unblock all");
 41 
 42 static spinlock_t rfkill_op_lock;
 43 static bool rfkill_op_pending;
 44 static unsigned long rfkill_sw_pending[BITS_TO_LONGS(NUM_RFKILL_TYPES)];
 45 static unsigned long rfkill_sw_state[BITS_TO_LONGS(NUM_RFKILL_TYPES)];
 46 
 47 enum rfkill_sched_op {
 48         RFKILL_GLOBAL_OP_EPO = 0,
 49         RFKILL_GLOBAL_OP_RESTORE,
 50         RFKILL_GLOBAL_OP_UNLOCK,
 51         RFKILL_GLOBAL_OP_UNBLOCK,
 52 };
 53 
 54 static enum rfkill_sched_op rfkill_master_switch_op;
 55 static enum rfkill_sched_op rfkill_op;
 56 
 57 static void __rfkill_handle_global_op(enum rfkill_sched_op op)
 58 {
 59         unsigned int i;
 60 
 61         switch (op) {
 62         case RFKILL_GLOBAL_OP_EPO:
 63                 rfkill_epo();
 64                 break;
 65         case RFKILL_GLOBAL_OP_RESTORE:
 66                 rfkill_restore_states();
 67                 break;
 68         case RFKILL_GLOBAL_OP_UNLOCK:
 69                 rfkill_remove_epo_lock();
 70                 break;
 71         case RFKILL_GLOBAL_OP_UNBLOCK:
 72                 rfkill_remove_epo_lock();
 73                 for (i = 0; i < NUM_RFKILL_TYPES; i++)
 74                         rfkill_switch_all(i, false);
 75                 break;
 76         default:
 77                 /* memory corruption or bug, fail safely */
 78                 rfkill_epo();
 79                 WARN(1, "Unknown requested operation %d! "
 80                         "rfkill Emergency Power Off activated\n",
 81                         op);
 82         }
 83 }
 84 
 85 static void __rfkill_handle_normal_op(const enum rfkill_type type,
 86                                       const bool complement)
 87 {
 88         bool blocked;
 89 
 90         blocked = rfkill_get_global_sw_state(type);
 91         if (complement)
 92                 blocked = !blocked;
 93 
 94         rfkill_switch_all(type, blocked);
 95 }
 96 
 97 static void rfkill_op_handler(struct work_struct *work)
 98 {
 99         unsigned int i;
100         bool c;
101 
102         spin_lock_irq(&rfkill_op_lock);
103         do {
104                 if (rfkill_op_pending) {
105                         enum rfkill_sched_op op = rfkill_op;
106                         rfkill_op_pending = false;
107                         memset(rfkill_sw_pending, 0,
108                                 sizeof(rfkill_sw_pending));
109                         spin_unlock_irq(&rfkill_op_lock);
110 
111                         __rfkill_handle_global_op(op);
112 
113                         spin_lock_irq(&rfkill_op_lock);
114 
115                         /*
116                          * handle global ops first -- during unlocked period
117                          * we might have gotten a new global op.
118                          */
119                         if (rfkill_op_pending)
120                                 continue;
121                 }
122 
123                 if (rfkill_is_epo_lock_active())
124                         continue;
125 
126                 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
127                         if (__test_and_clear_bit(i, rfkill_sw_pending)) {
128                                 c = __test_and_clear_bit(i, rfkill_sw_state);
129                                 spin_unlock_irq(&rfkill_op_lock);
130 
131                                 __rfkill_handle_normal_op(i, c);
132 
133                                 spin_lock_irq(&rfkill_op_lock);
134                         }
135                 }
136         } while (rfkill_op_pending);
137         spin_unlock_irq(&rfkill_op_lock);
138 }
139 
140 static DECLARE_DELAYED_WORK(rfkill_op_work, rfkill_op_handler);
141 static unsigned long rfkill_last_scheduled;
142 
143 static unsigned long rfkill_ratelimit(const unsigned long last)
144 {
145         const unsigned long delay = msecs_to_jiffies(RFKILL_OPS_DELAY);
146         return time_after(jiffies, last + delay) ? 0 : delay;
147 }
148 
149 static void rfkill_schedule_ratelimited(void)
150 {
151         if (schedule_delayed_work(&rfkill_op_work,
152                                   rfkill_ratelimit(rfkill_last_scheduled)))
153                 rfkill_last_scheduled = jiffies;
154 }
155 
156 static void rfkill_schedule_global_op(enum rfkill_sched_op op)
157 {
158         unsigned long flags;
159 
160         spin_lock_irqsave(&rfkill_op_lock, flags);
161         rfkill_op = op;
162         rfkill_op_pending = true;
163         if (op == RFKILL_GLOBAL_OP_EPO && !rfkill_is_epo_lock_active()) {
164                 /* bypass the limiter for EPO */
165                 mod_delayed_work(system_wq, &rfkill_op_work, 0);
166                 rfkill_last_scheduled = jiffies;
167         } else
168                 rfkill_schedule_ratelimited();
169         spin_unlock_irqrestore(&rfkill_op_lock, flags);
170 }
171 
172 static void rfkill_schedule_toggle(enum rfkill_type type)
173 {
174         unsigned long flags;
175 
176         if (rfkill_is_epo_lock_active())
177                 return;
178 
179         spin_lock_irqsave(&rfkill_op_lock, flags);
180         if (!rfkill_op_pending) {
181                 __set_bit(type, rfkill_sw_pending);
182                 __change_bit(type, rfkill_sw_state);
183                 rfkill_schedule_ratelimited();
184         }
185         spin_unlock_irqrestore(&rfkill_op_lock, flags);
186 }
187 
188 static void rfkill_schedule_evsw_rfkillall(int state)
189 {
190         if (state)
191                 rfkill_schedule_global_op(rfkill_master_switch_op);
192         else
193                 rfkill_schedule_global_op(RFKILL_GLOBAL_OP_EPO);
194 }
195 
196 static void rfkill_event(struct input_handle *handle, unsigned int type,
197                         unsigned int code, int data)
198 {
199         if (type == EV_KEY && data == 1) {
200                 switch (code) {
201                 case KEY_WLAN:
202                         rfkill_schedule_toggle(RFKILL_TYPE_WLAN);
203                         break;
204                 case KEY_BLUETOOTH:
205                         rfkill_schedule_toggle(RFKILL_TYPE_BLUETOOTH);
206                         break;
207                 case KEY_UWB:
208                         rfkill_schedule_toggle(RFKILL_TYPE_UWB);
209                         break;
210                 case KEY_WIMAX:
211                         rfkill_schedule_toggle(RFKILL_TYPE_WIMAX);
212                         break;
213                 case KEY_RFKILL:
214                         rfkill_schedule_toggle(RFKILL_TYPE_ALL);
215                         break;
216                 }
217         } else if (type == EV_SW && code == SW_RFKILL_ALL)
218                 rfkill_schedule_evsw_rfkillall(data);
219 }
220 
221 static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
222                           const struct input_device_id *id)
223 {
224         struct input_handle *handle;
225         int error;
226 
227         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
228         if (!handle)
229                 return -ENOMEM;
230 
231         handle->dev = dev;
232         handle->handler = handler;
233         handle->name = "rfkill";
234 
235         /* causes rfkill_start() to be called */
236         error = input_register_handle(handle);
237         if (error)
238                 goto err_free_handle;
239 
240         error = input_open_device(handle);
241         if (error)
242                 goto err_unregister_handle;
243 
244         return 0;
245 
246  err_unregister_handle:
247         input_unregister_handle(handle);
248  err_free_handle:
249         kfree(handle);
250         return error;
251 }
252 
253 static void rfkill_start(struct input_handle *handle)
254 {
255         /*
256          * Take event_lock to guard against configuration changes, we
257          * should be able to deal with concurrency with rfkill_event()
258          * just fine (which event_lock will also avoid).
259          */
260         spin_lock_irq(&handle->dev->event_lock);
261 
262         if (test_bit(EV_SW, handle->dev->evbit) &&
263             test_bit(SW_RFKILL_ALL, handle->dev->swbit))
264                 rfkill_schedule_evsw_rfkillall(test_bit(SW_RFKILL_ALL,
265                                                         handle->dev->sw));
266 
267         spin_unlock_irq(&handle->dev->event_lock);
268 }
269 
270 static void rfkill_disconnect(struct input_handle *handle)
271 {
272         input_close_device(handle);
273         input_unregister_handle(handle);
274         kfree(handle);
275 }
276 
277 static const struct input_device_id rfkill_ids[] = {
278         {
279                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
280                 .evbit = { BIT_MASK(EV_KEY) },
281                 .keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
282         },
283         {
284                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
285                 .evbit = { BIT_MASK(EV_KEY) },
286                 .keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
287         },
288         {
289                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
290                 .evbit = { BIT_MASK(EV_KEY) },
291                 .keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
292         },
293         {
294                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
295                 .evbit = { BIT_MASK(EV_KEY) },
296                 .keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
297         },
298         {
299                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
300                 .evbit = { BIT_MASK(EV_KEY) },
301                 .keybit = { [BIT_WORD(KEY_RFKILL)] = BIT_MASK(KEY_RFKILL) },
302         },
303         {
304                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_SWBIT,
305                 .evbit = { BIT(EV_SW) },
306                 .swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
307         },
308         { }
309 };
310 
311 static struct input_handler rfkill_handler = {
312         .name = "rfkill",
313         .event = rfkill_event,
314         .connect = rfkill_connect,
315         .start = rfkill_start,
316         .disconnect = rfkill_disconnect,
317         .id_table = rfkill_ids,
318 };
319 
320 int __init rfkill_handler_init(void)
321 {
322         switch (rfkill_master_switch_mode) {
323         case RFKILL_INPUT_MASTER_UNBLOCKALL:
324                 rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNBLOCK;
325                 break;
326         case RFKILL_INPUT_MASTER_RESTORE:
327                 rfkill_master_switch_op = RFKILL_GLOBAL_OP_RESTORE;
328                 break;
329         case RFKILL_INPUT_MASTER_UNLOCK:
330                 rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNLOCK;
331                 break;
332         default:
333                 return -EINVAL;
334         }
335 
336         spin_lock_init(&rfkill_op_lock);
337 
338         /* Avoid delay at first schedule */
339         rfkill_last_scheduled =
340                         jiffies - msecs_to_jiffies(RFKILL_OPS_DELAY) - 1;
341         return input_register_handler(&rfkill_handler);
342 }
343 
344 void __exit rfkill_handler_exit(void)
345 {
346         input_unregister_handler(&rfkill_handler);
347         cancel_delayed_work_sync(&rfkill_op_work);
348 }
349 

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