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  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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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 (delayed_work_pending(&rfkill_op_work))
 
152
                return;
 
153
        schedule_delayed_work(&rfkill_op_work,
 
154
                              rfkill_ratelimit(rfkill_last_scheduled));
 
155
        rfkill_last_scheduled = jiffies;
 
156
}
 
157
 
 
158
static void rfkill_schedule_global_op(enum rfkill_sched_op op)
 
159
{
 
160
        unsigned long flags;
 
161
 
 
162
        spin_lock_irqsave(&rfkill_op_lock, flags);
 
163
        rfkill_op = op;
 
164
        rfkill_op_pending = true;
 
165
        if (op == RFKILL_GLOBAL_OP_EPO && !rfkill_is_epo_lock_active()) {
 
166
                /* bypass the limiter for EPO */
 
167
                cancel_delayed_work(&rfkill_op_work);
 
168
                schedule_delayed_work(&rfkill_op_work, 0);
 
169
                rfkill_last_scheduled = jiffies;
 
170
        } else
 
171
                rfkill_schedule_ratelimited();
 
172
        spin_unlock_irqrestore(&rfkill_op_lock, flags);
 
173
}
 
174
 
 
175
static void rfkill_schedule_toggle(enum rfkill_type type)
 
176
{
 
177
        unsigned long flags;
 
178
 
 
179
        if (rfkill_is_epo_lock_active())
 
180
                return;
 
181
 
 
182
        spin_lock_irqsave(&rfkill_op_lock, flags);
 
183
        if (!rfkill_op_pending) {
 
184
                __set_bit(type, rfkill_sw_pending);
 
185
                __change_bit(type, rfkill_sw_state);
 
186
                rfkill_schedule_ratelimited();
 
187
        }
 
188
        spin_unlock_irqrestore(&rfkill_op_lock, flags);
 
189
}
 
190
 
 
191
static void rfkill_schedule_evsw_rfkillall(int state)
 
192
{
 
193
        if (state)
 
194
                rfkill_schedule_global_op(rfkill_master_switch_op);
 
195
        else
 
196
                rfkill_schedule_global_op(RFKILL_GLOBAL_OP_EPO);
 
197
}
 
198
 
 
199
static void rfkill_event(struct input_handle *handle, unsigned int type,
 
200
                        unsigned int code, int data)
 
201
{
 
202
        if (type == EV_KEY && data == 1) {
 
203
                switch (code) {
 
204
                case KEY_WLAN:
 
205
                        rfkill_schedule_toggle(RFKILL_TYPE_WLAN);
 
206
                        break;
 
207
                case KEY_BLUETOOTH:
 
208
                        rfkill_schedule_toggle(RFKILL_TYPE_BLUETOOTH);
 
209
                        break;
 
210
                case KEY_UWB:
 
211
                        rfkill_schedule_toggle(RFKILL_TYPE_UWB);
 
212
                        break;
 
213
                case KEY_WIMAX:
 
214
                        rfkill_schedule_toggle(RFKILL_TYPE_WIMAX);
 
215
                        break;
 
216
                case KEY_RFKILL:
 
217
                        rfkill_schedule_toggle(RFKILL_TYPE_ALL);
 
218
                        break;
 
219
                }
 
220
        } else if (type == EV_SW && code == SW_RFKILL_ALL)
 
221
                rfkill_schedule_evsw_rfkillall(data);
 
222
}
 
223
 
 
224
static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
 
225
                          const struct input_device_id *id)
 
226
{
 
227
        struct input_handle *handle;
 
228
        int error;
 
229
 
 
230
        handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
 
231
        if (!handle)
 
232
                return -ENOMEM;
 
233
 
 
234
        handle->dev = dev;
 
235
        handle->handler = handler;
 
236
        handle->name = "rfkill";
 
237
 
 
238
        /* causes rfkill_start() to be called */
 
239
        error = input_register_handle(handle);
 
240
        if (error)
 
241
                goto err_free_handle;
 
242
 
 
243
        error = input_open_device(handle);
 
244
        if (error)
 
245
                goto err_unregister_handle;
 
246
 
 
247
        return 0;
 
248
 
 
249
 err_unregister_handle:
 
250
        input_unregister_handle(handle);
 
251
 err_free_handle:
 
252
        kfree(handle);
 
253
        return error;
 
254
}
 
255
 
 
256
static void rfkill_start(struct input_handle *handle)
 
257
{
 
258
        /*
 
259
         * Take event_lock to guard against configuration changes, we
 
260
         * should be able to deal with concurrency with rfkill_event()
 
261
         * just fine (which event_lock will also avoid).
 
262
         */
 
263
        spin_lock_irq(&handle->dev->event_lock);
 
264
 
 
265
        if (test_bit(EV_SW, handle->dev->evbit) &&
 
266
            test_bit(SW_RFKILL_ALL, handle->dev->swbit))
 
267
                rfkill_schedule_evsw_rfkillall(test_bit(SW_RFKILL_ALL,
 
268
                                                        handle->dev->sw));
 
269
 
 
270
        spin_unlock_irq(&handle->dev->event_lock);
 
271
}
 
272
 
 
273
static void rfkill_disconnect(struct input_handle *handle)
 
274
{
 
275
        input_close_device(handle);
 
276
        input_unregister_handle(handle);
 
277
        kfree(handle);
 
278
}
 
279
 
 
280
static const struct input_device_id rfkill_ids[] = {
 
281
        {
 
282
                .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 
283
                .evbit = { BIT_MASK(EV_KEY) },
 
284
                .keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
 
285
        },
 
286
        {
 
287
                .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 
288
                .evbit = { BIT_MASK(EV_KEY) },
 
289
                .keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
 
290
        },
 
291
        {
 
292
                .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 
293
                .evbit = { BIT_MASK(EV_KEY) },
 
294
                .keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
 
295
        },
 
296
        {
 
297
                .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 
298
                .evbit = { BIT_MASK(EV_KEY) },
 
299
                .keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
 
300
        },
 
301
        {
 
302
                .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 
303
                .evbit = { BIT_MASK(EV_KEY) },
 
304
                .keybit = { [BIT_WORD(KEY_RFKILL)] = BIT_MASK(KEY_RFKILL) },
 
305
        },
 
306
        {
 
307
                .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_SWBIT,
 
308
                .evbit = { BIT(EV_SW) },
 
309
                .swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
 
310
        },
 
311
        { }
 
312
};
 
313
 
 
314
static struct input_handler rfkill_handler = {
 
315
        .name = "rfkill",
 
316
        .event = rfkill_event,
 
317
        .connect = rfkill_connect,
 
318
        .start = rfkill_start,
 
319
        .disconnect = rfkill_disconnect,
 
320
        .id_table = rfkill_ids,
 
321
};
 
322
 
 
323
int __init rfkill_handler_init(void)
 
324
{
 
325
        switch (rfkill_master_switch_mode) {
 
326
        case RFKILL_INPUT_MASTER_UNBLOCKALL:
 
327
                rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNBLOCK;
 
328
                break;
 
329
        case RFKILL_INPUT_MASTER_RESTORE:
 
330
                rfkill_master_switch_op = RFKILL_GLOBAL_OP_RESTORE;
 
331
                break;
 
332
        case RFKILL_INPUT_MASTER_UNLOCK:
 
333
                rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNLOCK;
 
334
                break;
 
335
        default:
 
336
                return -EINVAL;
 
337
        }
 
338
 
 
339
        spin_lock_init(&rfkill_op_lock);
 
340
 
 
341
        /* Avoid delay at first schedule */
 
342
        rfkill_last_scheduled =
 
343
                        jiffies - msecs_to_jiffies(RFKILL_OPS_DELAY) - 1;
 
344
        return input_register_handler(&rfkill_handler);
 
345
}
 
346
 
 
347
void __exit rfkill_handler_exit(void)
 
348
{
 
349
        input_unregister_handler(&rfkill_handler);
 
350
        cancel_delayed_work_sync(&rfkill_op_work);
 
351
}