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DEFINITIONS
This source file includes following definitions.
- rfkill_task_handler
- rfkill_task_epo_handler
- rfkill_schedule_epo
- rfkill_schedule_set
- rfkill_schedule_toggle
- rfkill_schedule_evsw_rfkillall
- rfkill_event
- rfkill_connect
- rfkill_start
- rfkill_disconnect
- rfkill_handler_init
- rfkill_handler_exit
/*
* Input layer to RF Kill interface connector
*
* Copyright (c) 2007 Dmitry Torokhov
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/init.h>
#include <linux/rfkill.h>
#include <linux/sched.h>
#include "rfkill-input.h"
MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
MODULE_DESCRIPTION("Input layer to RF switch connector");
MODULE_LICENSE("GPL");
struct rfkill_task {
struct work_struct work;
enum rfkill_type type;
struct mutex mutex; /* ensures that task is serialized */
spinlock_t lock; /* for accessing last and desired state */
unsigned long last; /* last schedule */
enum rfkill_state desired_state; /* on/off */
};
static void rfkill_task_handler(struct work_struct *work)
{
struct rfkill_task *task = container_of(work, struct rfkill_task, work);
mutex_lock(&task->mutex);
rfkill_switch_all(task->type, task->desired_state);
mutex_unlock(&task->mutex);
}
static void rfkill_task_epo_handler(struct work_struct *work)
{
rfkill_epo();
}
static DECLARE_WORK(epo_work, rfkill_task_epo_handler);
static void rfkill_schedule_epo(void)
{
schedule_work(&epo_work);
}
static void rfkill_schedule_set(struct rfkill_task *task,
enum rfkill_state desired_state)
{
unsigned long flags;
if (unlikely(work_pending(&epo_work)))
return;
spin_lock_irqsave(&task->lock, flags);
if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
task->desired_state = desired_state;
task->last = jiffies;
schedule_work(&task->work);
}
spin_unlock_irqrestore(&task->lock, flags);
}
static void rfkill_schedule_toggle(struct rfkill_task *task)
{
unsigned long flags;
if (unlikely(work_pending(&epo_work)))
return;
spin_lock_irqsave(&task->lock, flags);
if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
task->desired_state =
rfkill_state_complement(task->desired_state);
task->last = jiffies;
schedule_work(&task->work);
}
spin_unlock_irqrestore(&task->lock, flags);
}
#define DEFINE_RFKILL_TASK(n, t) \
struct rfkill_task n = { \
.work = __WORK_INITIALIZER(n.work, \
rfkill_task_handler), \
.type = t, \
.mutex = __MUTEX_INITIALIZER(n.mutex), \
.lock = __SPIN_LOCK_UNLOCKED(n.lock), \
.desired_state = RFKILL_STATE_UNBLOCKED, \
}
static DEFINE_RFKILL_TASK(rfkill_wlan, RFKILL_TYPE_WLAN);
static DEFINE_RFKILL_TASK(rfkill_bt, RFKILL_TYPE_BLUETOOTH);
static DEFINE_RFKILL_TASK(rfkill_uwb, RFKILL_TYPE_UWB);
static DEFINE_RFKILL_TASK(rfkill_wimax, RFKILL_TYPE_WIMAX);
static DEFINE_RFKILL_TASK(rfkill_wwan, RFKILL_TYPE_WWAN);
static void rfkill_schedule_evsw_rfkillall(int state)
{
/* EVERY radio type. state != 0 means radios ON */
/* handle EPO (emergency power off) through shortcut */
if (state) {
rfkill_schedule_set(&rfkill_wwan,
RFKILL_STATE_UNBLOCKED);
rfkill_schedule_set(&rfkill_wimax,
RFKILL_STATE_UNBLOCKED);
rfkill_schedule_set(&rfkill_uwb,
RFKILL_STATE_UNBLOCKED);
rfkill_schedule_set(&rfkill_bt,
RFKILL_STATE_UNBLOCKED);
rfkill_schedule_set(&rfkill_wlan,
RFKILL_STATE_UNBLOCKED);
} else
rfkill_schedule_epo();
}
static void rfkill_event(struct input_handle *handle, unsigned int type,
unsigned int code, int data)
{
if (type == EV_KEY && data == 1) {
switch (code) {
case KEY_WLAN:
rfkill_schedule_toggle(&rfkill_wlan);
break;
case KEY_BLUETOOTH:
rfkill_schedule_toggle(&rfkill_bt);
break;
case KEY_UWB:
rfkill_schedule_toggle(&rfkill_uwb);
break;
case KEY_WIMAX:
rfkill_schedule_toggle(&rfkill_wimax);
break;
default:
break;
}
} else if (type == EV_SW) {
switch (code) {
case SW_RFKILL_ALL:
rfkill_schedule_evsw_rfkillall(data);
break;
default:
break;
}
}
}
static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
const struct input_device_id *id)
{
struct input_handle *handle;
int error;
handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
if (!handle)
return -ENOMEM;
handle->dev = dev;
handle->handler = handler;
handle->name = "rfkill";
/* causes rfkill_start() to be called */
error = input_register_handle(handle);
if (error)
goto err_free_handle;
error = input_open_device(handle);
if (error)
goto err_unregister_handle;
return 0;
err_unregister_handle:
input_unregister_handle(handle);
err_free_handle:
kfree(handle);
return error;
}
static void rfkill_start(struct input_handle *handle)
{
/* Take event_lock to guard against configuration changes, we
* should be able to deal with concurrency with rfkill_event()
* just fine (which event_lock will also avoid). */
spin_lock_irq(&handle->dev->event_lock);
if (test_bit(EV_SW, handle->dev->evbit)) {
if (test_bit(SW_RFKILL_ALL, handle->dev->swbit))
rfkill_schedule_evsw_rfkillall(test_bit(SW_RFKILL_ALL,
handle->dev->sw));
/* add resync for further EV_SW events here */
}
spin_unlock_irq(&handle->dev->event_lock);
}
static void rfkill_disconnect(struct input_handle *handle)
{
input_close_device(handle);
input_unregister_handle(handle);
kfree(handle);
}
static const struct input_device_id rfkill_ids[] = {
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT_MASK(EV_KEY) },
.keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT_MASK(EV_KEY) },
.keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT_MASK(EV_KEY) },
.keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT_MASK(EV_KEY) },
.keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_SWBIT,
.evbit = { BIT(EV_SW) },
.swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
},
{ }
};
static struct input_handler rfkill_handler = {
.event = rfkill_event,
.connect = rfkill_connect,
.disconnect = rfkill_disconnect,
.start = rfkill_start,
.name = "rfkill",
.id_table = rfkill_ids,
};
static int __init rfkill_handler_init(void)
{
return input_register_handler(&rfkill_handler);
}
static void __exit rfkill_handler_exit(void)
{
input_unregister_handler(&rfkill_handler);
flush_scheduled_work();
}
module_init(rfkill_handler_init);
module_exit(rfkill_handler_exit);