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);