Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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
22MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
23MODULE_DESCRIPTION("Input layer to RF switch connector");
24MODULE_LICENSE("GPL");
25
26struct 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
36static 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
58static void rfkill_schedule_toggle(struct rfkill_task *task)
59{
60 unsigned long flags;
61
62 spin_lock_irqsave(&task->lock, flags);
63
64 if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
65 task->desired_state = !task->desired_state;
66 task->last = jiffies;
67 schedule_work(&task->work);
68 }
69
70 spin_unlock_irqrestore(&task->lock, flags);
71}
72
73#define DEFINE_RFKILL_TASK(n, t) \
74 struct rfkill_task n = { \
75 .work = __WORK_INITIALIZER(n.work, \
76 rfkill_task_handler), \
77 .type = t, \
78 .mutex = __MUTEX_INITIALIZER(n.mutex), \
79 .lock = __SPIN_LOCK_UNLOCKED(n.lock), \
80 .desired_state = RFKILL_STATE_ON, \
81 .current_state = RFKILL_STATE_ON, \
82 }
83
84static DEFINE_RFKILL_TASK(rfkill_wlan, RFKILL_TYPE_WLAN);
85static DEFINE_RFKILL_TASK(rfkill_bt, RFKILL_TYPE_BLUETOOTH);
86static DEFINE_RFKILL_TASK(rfkill_uwb, RFKILL_TYPE_UWB);
87static DEFINE_RFKILL_TASK(rfkill_wimax, RFKILL_TYPE_WIMAX);
88
89static void rfkill_event(struct input_handle *handle, unsigned int type,
90 unsigned int code, int down)
91{
92 if (type == EV_KEY && down == 1) {
93 switch (code) {
94 case KEY_WLAN:
95 rfkill_schedule_toggle(&rfkill_wlan);
96 break;
97 case KEY_BLUETOOTH:
98 rfkill_schedule_toggle(&rfkill_bt);
99 break;
100 case KEY_UWB:
101 rfkill_schedule_toggle(&rfkill_uwb);
102 break;
103 case KEY_WIMAX:
104 rfkill_schedule_toggle(&rfkill_wimax);
105 break;
106 default:
107 break;
108 }
109 }
110}
111
112static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
113 const struct input_device_id *id)
114{
115 struct input_handle *handle;
116 int error;
117
118 handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
119 if (!handle)
120 return -ENOMEM;
121
122 handle->dev = dev;
123 handle->handler = handler;
124 handle->name = "rfkill";
125
126 error = input_register_handle(handle);
127 if (error)
128 goto err_free_handle;
129
130 error = input_open_device(handle);
131 if (error)
132 goto err_unregister_handle;
133
134 return 0;
135
136 err_unregister_handle:
137 input_unregister_handle(handle);
138 err_free_handle:
139 kfree(handle);
140 return error;
141}
142
143static void rfkill_disconnect(struct input_handle *handle)
144{
145 input_close_device(handle);
146 input_unregister_handle(handle);
147 kfree(handle);
148}
149
150static const struct input_device_id rfkill_ids[] = {
151 {
152 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
153 .evbit = { BIT_MASK(EV_KEY) },
154 .keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
155 },
156 {
157 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
158 .evbit = { BIT_MASK(EV_KEY) },
159 .keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
160 },
161 {
162 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
163 .evbit = { BIT_MASK(EV_KEY) },
164 .keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
165 },
166 {
167 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
168 .evbit = { BIT_MASK(EV_KEY) },
169 .keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
170 },
171 { }
172};
173
174static struct input_handler rfkill_handler = {
175 .event = rfkill_event,
176 .connect = rfkill_connect,
177 .disconnect = rfkill_disconnect,
178 .name = "rfkill",
179 .id_table = rfkill_ids,
180};
181
182static int __init rfkill_handler_init(void)
183{
184 return input_register_handler(&rfkill_handler);
185}
186
187static void __exit rfkill_handler_exit(void)
188{
189 input_unregister_handler(&rfkill_handler);
190 flush_scheduled_work();
191}
192
193module_init(rfkill_handler_init);
194module_exit(rfkill_handler_exit);