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   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);