rfkill: add the WWAN radio type
[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         enum rfkill_state current_state; /* on/off */
34 };
35
36 static void rfkill_task_handler(struct work_struct *work)
37 {
38         struct rfkill_task *task = container_of(work, struct rfkill_task, work);
39         enum rfkill_state state;
40
41         mutex_lock(&task->mutex);
42
43         /*
44          * Use temp variable to fetch desired state to keep it
45          * consistent even if rfkill_schedule_toggle() runs in
46          * another thread or interrupts us.
47          */
48         state = task->desired_state;
49
50         if (state != task->current_state) {
51                 rfkill_switch_all(task->type, state);
52                 task->current_state = state;
53         }
54
55         mutex_unlock(&task->mutex);
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         spin_lock_irqsave(&task->lock, flags);
64
65         if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
66                 task->desired_state = desired_state;
67                 task->last = jiffies;
68                 schedule_work(&task->work);
69         }
70
71         spin_unlock_irqrestore(&task->lock, flags);
72 }
73
74 static void rfkill_schedule_toggle(struct rfkill_task *task)
75 {
76         unsigned long flags;
77
78         spin_lock_irqsave(&task->lock, flags);
79
80         if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
81                 task->desired_state = !task->desired_state;
82                 task->last = jiffies;
83                 schedule_work(&task->work);
84         }
85
86         spin_unlock_irqrestore(&task->lock, flags);
87 }
88
89 #define DEFINE_RFKILL_TASK(n, t)                        \
90         struct rfkill_task n = {                        \
91                 .work = __WORK_INITIALIZER(n.work,      \
92                                 rfkill_task_handler),   \
93                 .type = t,                              \
94                 .mutex = __MUTEX_INITIALIZER(n.mutex),  \
95                 .lock = __SPIN_LOCK_UNLOCKED(n.lock),   \
96                 .desired_state = RFKILL_STATE_ON,       \
97                 .current_state = RFKILL_STATE_ON,       \
98         }
99
100 static DEFINE_RFKILL_TASK(rfkill_wlan, RFKILL_TYPE_WLAN);
101 static DEFINE_RFKILL_TASK(rfkill_bt, RFKILL_TYPE_BLUETOOTH);
102 static DEFINE_RFKILL_TASK(rfkill_uwb, RFKILL_TYPE_UWB);
103 static DEFINE_RFKILL_TASK(rfkill_wimax, RFKILL_TYPE_WIMAX);
104 static DEFINE_RFKILL_TASK(rfkill_wwan, RFKILL_TYPE_WWAN);
105
106 static void rfkill_event(struct input_handle *handle, unsigned int type,
107                         unsigned int code, int data)
108 {
109         if (type == EV_KEY && data == 1) {
110                 switch (code) {
111                 case KEY_WLAN:
112                         rfkill_schedule_toggle(&rfkill_wlan);
113                         break;
114                 case KEY_BLUETOOTH:
115                         rfkill_schedule_toggle(&rfkill_bt);
116                         break;
117                 case KEY_UWB:
118                         rfkill_schedule_toggle(&rfkill_uwb);
119                         break;
120                 case KEY_WIMAX:
121                         rfkill_schedule_toggle(&rfkill_wimax);
122                         break;
123                 default:
124                         break;
125                 }
126         } else if (type == EV_SW) {
127                 switch (code) {
128                 case SW_RFKILL_ALL:
129                         /* EVERY radio type. data != 0 means radios ON */
130                         rfkill_schedule_set(&rfkill_wwan,
131                                             (data)? RFKILL_STATE_ON:
132                                                     RFKILL_STATE_OFF);
133                         rfkill_schedule_set(&rfkill_wimax,
134                                             (data)? RFKILL_STATE_ON:
135                                                     RFKILL_STATE_OFF);
136                         rfkill_schedule_set(&rfkill_uwb,
137                                             (data)? RFKILL_STATE_ON:
138                                                     RFKILL_STATE_OFF);
139                         rfkill_schedule_set(&rfkill_bt,
140                                             (data)? RFKILL_STATE_ON:
141                                                     RFKILL_STATE_OFF);
142                         rfkill_schedule_set(&rfkill_wlan,
143                                             (data)? RFKILL_STATE_ON:
144                                                     RFKILL_STATE_OFF);
145                         break;
146                 default:
147                         break;
148                 }
149         }
150 }
151
152 static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
153                           const struct input_device_id *id)
154 {
155         struct input_handle *handle;
156         int error;
157
158         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
159         if (!handle)
160                 return -ENOMEM;
161
162         handle->dev = dev;
163         handle->handler = handler;
164         handle->name = "rfkill";
165
166         error = input_register_handle(handle);
167         if (error)
168                 goto err_free_handle;
169
170         error = input_open_device(handle);
171         if (error)
172                 goto err_unregister_handle;
173
174         return 0;
175
176  err_unregister_handle:
177         input_unregister_handle(handle);
178  err_free_handle:
179         kfree(handle);
180         return error;
181 }
182
183 static void rfkill_disconnect(struct input_handle *handle)
184 {
185         input_close_device(handle);
186         input_unregister_handle(handle);
187         kfree(handle);
188 }
189
190 static const struct input_device_id rfkill_ids[] = {
191         {
192                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
193                 .evbit = { BIT_MASK(EV_KEY) },
194                 .keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
195         },
196         {
197                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
198                 .evbit = { BIT_MASK(EV_KEY) },
199                 .keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
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_UWB)] = BIT_MASK(KEY_UWB) },
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_WIMAX)] = BIT_MASK(KEY_WIMAX) },
210         },
211         {
212                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_SWBIT,
213                 .evbit = { BIT(EV_SW) },
214                 .swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
215         },
216         { }
217 };
218
219 static struct input_handler rfkill_handler = {
220         .event =        rfkill_event,
221         .connect =      rfkill_connect,
222         .disconnect =   rfkill_disconnect,
223         .name =         "rfkill",
224         .id_table =     rfkill_ids,
225 };
226
227 static int __init rfkill_handler_init(void)
228 {
229         return input_register_handler(&rfkill_handler);
230 }
231
232 static void __exit rfkill_handler_exit(void)
233 {
234         input_unregister_handler(&rfkill_handler);
235         flush_scheduled_work();
236 }
237
238 module_init(rfkill_handler_init);
239 module_exit(rfkill_handler_exit);