rfkill: rename the rfkill_state states and add block-locked state
[linux-2.6] / net / rfkill / rfkill-input.c
1 /*
2  * Input layer to RF Kill interface connector
3  *
4  * Copyright (c) 2007 Dmitry Torokhov
5  */
6
7 /*
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of the GNU General Public License version 2 as published
10  * by the Free Software Foundation.
11  */
12
13 #include <linux/module.h>
14 #include <linux/input.h>
15 #include <linux/slab.h>
16 #include <linux/workqueue.h>
17 #include <linux/init.h>
18 #include <linux/rfkill.h>
19
20 #include "rfkill-input.h"
21
22 MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
23 MODULE_DESCRIPTION("Input layer to RF switch connector");
24 MODULE_LICENSE("GPL");
25
26 struct rfkill_task {
27         struct work_struct work;
28         enum rfkill_type type;
29         struct mutex mutex; /* ensures that task is serialized */
30         spinlock_t lock; /* for accessing last and desired state */
31         unsigned long last; /* last schedule */
32         enum rfkill_state desired_state; /* on/off */
33 };
34
35 static void rfkill_task_handler(struct work_struct *work)
36 {
37         struct rfkill_task *task = container_of(work, struct rfkill_task, work);
38
39         mutex_lock(&task->mutex);
40
41         rfkill_switch_all(task->type, task->desired_state);
42
43         mutex_unlock(&task->mutex);
44 }
45
46 static void rfkill_task_epo_handler(struct work_struct *work)
47 {
48         rfkill_epo();
49 }
50
51 static DECLARE_WORK(epo_work, rfkill_task_epo_handler);
52
53 static void rfkill_schedule_epo(void)
54 {
55         schedule_work(&epo_work);
56 }
57
58 static void rfkill_schedule_set(struct rfkill_task *task,
59                                 enum rfkill_state desired_state)
60 {
61         unsigned long flags;
62
63         if (unlikely(work_pending(&epo_work)))
64                 return;
65
66         spin_lock_irqsave(&task->lock, flags);
67
68         if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
69                 task->desired_state = desired_state;
70                 task->last = jiffies;
71                 schedule_work(&task->work);
72         }
73
74         spin_unlock_irqrestore(&task->lock, flags);
75 }
76
77 static void rfkill_schedule_toggle(struct rfkill_task *task)
78 {
79         unsigned long flags;
80
81         if (unlikely(work_pending(&epo_work)))
82                 return;
83
84         spin_lock_irqsave(&task->lock, flags);
85
86         if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
87                 task->desired_state =
88                                 rfkill_state_complement(task->desired_state);
89                 task->last = jiffies;
90                 schedule_work(&task->work);
91         }
92
93         spin_unlock_irqrestore(&task->lock, flags);
94 }
95
96 #define DEFINE_RFKILL_TASK(n, t)                                \
97         struct rfkill_task n = {                                \
98                 .work = __WORK_INITIALIZER(n.work,              \
99                                 rfkill_task_handler),           \
100                 .type = t,                                      \
101                 .mutex = __MUTEX_INITIALIZER(n.mutex),          \
102                 .lock = __SPIN_LOCK_UNLOCKED(n.lock),           \
103                 .desired_state = RFKILL_STATE_UNBLOCKED,        \
104         }
105
106 static DEFINE_RFKILL_TASK(rfkill_wlan, RFKILL_TYPE_WLAN);
107 static DEFINE_RFKILL_TASK(rfkill_bt, RFKILL_TYPE_BLUETOOTH);
108 static DEFINE_RFKILL_TASK(rfkill_uwb, RFKILL_TYPE_UWB);
109 static DEFINE_RFKILL_TASK(rfkill_wimax, RFKILL_TYPE_WIMAX);
110 static DEFINE_RFKILL_TASK(rfkill_wwan, RFKILL_TYPE_WWAN);
111
112 static void rfkill_event(struct input_handle *handle, unsigned int type,
113                         unsigned int code, int data)
114 {
115         if (type == EV_KEY && data == 1) {
116                 switch (code) {
117                 case KEY_WLAN:
118                         rfkill_schedule_toggle(&rfkill_wlan);
119                         break;
120                 case KEY_BLUETOOTH:
121                         rfkill_schedule_toggle(&rfkill_bt);
122                         break;
123                 case KEY_UWB:
124                         rfkill_schedule_toggle(&rfkill_uwb);
125                         break;
126                 case KEY_WIMAX:
127                         rfkill_schedule_toggle(&rfkill_wimax);
128                         break;
129                 default:
130                         break;
131                 }
132         } else if (type == EV_SW) {
133                 switch (code) {
134                 case SW_RFKILL_ALL:
135                         /* EVERY radio type. data != 0 means radios ON */
136                         /* handle EPO (emergency power off) through shortcut */
137                         if (data) {
138                                 rfkill_schedule_set(&rfkill_wwan,
139                                                     RFKILL_STATE_UNBLOCKED);
140                                 rfkill_schedule_set(&rfkill_wimax,
141                                                     RFKILL_STATE_UNBLOCKED);
142                                 rfkill_schedule_set(&rfkill_uwb,
143                                                     RFKILL_STATE_UNBLOCKED);
144                                 rfkill_schedule_set(&rfkill_bt,
145                                                     RFKILL_STATE_UNBLOCKED);
146                                 rfkill_schedule_set(&rfkill_wlan,
147                                                     RFKILL_STATE_UNBLOCKED);
148                         } else
149                                 rfkill_schedule_epo();
150                         break;
151                 default:
152                         break;
153                 }
154         }
155 }
156
157 static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
158                           const struct input_device_id *id)
159 {
160         struct input_handle *handle;
161         int error;
162
163         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
164         if (!handle)
165                 return -ENOMEM;
166
167         handle->dev = dev;
168         handle->handler = handler;
169         handle->name = "rfkill";
170
171         error = input_register_handle(handle);
172         if (error)
173                 goto err_free_handle;
174
175         error = input_open_device(handle);
176         if (error)
177                 goto err_unregister_handle;
178
179         return 0;
180
181  err_unregister_handle:
182         input_unregister_handle(handle);
183  err_free_handle:
184         kfree(handle);
185         return error;
186 }
187
188 static void rfkill_disconnect(struct input_handle *handle)
189 {
190         input_close_device(handle);
191         input_unregister_handle(handle);
192         kfree(handle);
193 }
194
195 static const struct input_device_id rfkill_ids[] = {
196         {
197                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
198                 .evbit = { BIT_MASK(EV_KEY) },
199                 .keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
200         },
201         {
202                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
203                 .evbit = { BIT_MASK(EV_KEY) },
204                 .keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
205         },
206         {
207                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
208                 .evbit = { BIT_MASK(EV_KEY) },
209                 .keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
210         },
211         {
212                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
213                 .evbit = { BIT_MASK(EV_KEY) },
214                 .keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
215         },
216         {
217                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_SWBIT,
218                 .evbit = { BIT(EV_SW) },
219                 .swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
220         },
221         { }
222 };
223
224 static struct input_handler rfkill_handler = {
225         .event =        rfkill_event,
226         .connect =      rfkill_connect,
227         .disconnect =   rfkill_disconnect,
228         .name =         "rfkill",
229         .id_table =     rfkill_ids,
230 };
231
232 static int __init rfkill_handler_init(void)
233 {
234         return input_register_handler(&rfkill_handler);
235 }
236
237 static void __exit rfkill_handler_exit(void)
238 {
239         input_unregister_handler(&rfkill_handler);
240         flush_scheduled_work();
241 }
242
243 module_init(rfkill_handler_init);
244 module_exit(rfkill_handler_exit);