175 lines
4 KiB
C
175 lines
4 KiB
C
/*
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* Input layer to RF Kill interface connector
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*
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* Copyright (c) 2007 Dmitry Torokhov
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/init.h>
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#include <linux/rfkill.h>
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MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
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MODULE_DESCRIPTION("Input layer to RF switch connector");
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MODULE_LICENSE("GPL");
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struct rfkill_task {
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struct work_struct work;
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enum rfkill_type type;
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struct mutex mutex; /* ensures that task is serialized */
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spinlock_t lock; /* for accessing last and desired state */
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unsigned long last; /* last schedule */
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enum rfkill_state desired_state; /* on/off */
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enum rfkill_state current_state; /* on/off */
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};
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static void rfkill_task_handler(struct work_struct *work)
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{
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struct rfkill_task *task = container_of(work, struct rfkill_task, work);
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enum rfkill_state state;
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mutex_lock(&task->mutex);
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/*
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* Use temp variable to fetch desired state to keep it
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* consistent even if rfkill_schedule_toggle() runs in
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* another thread or interrupts us.
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*/
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state = task->desired_state;
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if (state != task->current_state) {
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rfkill_switch_all(task->type, state);
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task->current_state = state;
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}
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mutex_unlock(&task->mutex);
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}
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static void rfkill_schedule_toggle(struct rfkill_task *task)
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{
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unsigned long flags;
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spin_lock_irqsave(&task->lock, flags);
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if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
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task->desired_state = !task->desired_state;
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task->last = jiffies;
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schedule_work(&task->work);
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}
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spin_unlock_irqrestore(&task->lock, flags);
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}
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#define DEFINE_RFKILL_TASK(n, t) \
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struct rfkill_task n = { \
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.work = __WORK_INITIALIZER(n.work, \
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rfkill_task_handler), \
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.type = t, \
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.mutex = __MUTEX_INITIALIZER(n.mutex), \
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.lock = __SPIN_LOCK_UNLOCKED(n.lock), \
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.desired_state = RFKILL_STATE_ON, \
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.current_state = RFKILL_STATE_ON, \
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}
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static DEFINE_RFKILL_TASK(rfkill_wlan, RFKILL_TYPE_WLAN);
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static DEFINE_RFKILL_TASK(rfkill_bt, RFKILL_TYPE_BLUETOOTH);
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static void rfkill_event(struct input_handle *handle, unsigned int type,
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unsigned int code, int down)
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{
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if (type == EV_KEY && down == 1) {
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switch (code) {
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case KEY_WLAN:
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rfkill_schedule_toggle(&rfkill_wlan);
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break;
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case KEY_BLUETOOTH:
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rfkill_schedule_toggle(&rfkill_bt);
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break;
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default:
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break;
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}
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}
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}
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static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
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const struct input_device_id *id)
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{
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struct input_handle *handle;
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int error;
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handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
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if (!handle)
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return -ENOMEM;
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handle->dev = dev;
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handle->handler = handler;
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handle->name = "rfkill";
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error = input_register_handle(handle);
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if (error)
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goto err_free_handle;
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error = input_open_device(handle);
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if (error)
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goto err_unregister_handle;
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return 0;
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err_unregister_handle:
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input_unregister_handle(handle);
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err_free_handle:
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kfree(handle);
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return error;
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}
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static void rfkill_disconnect(struct input_handle *handle)
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{
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input_close_device(handle);
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input_unregister_handle(handle);
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kfree(handle);
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}
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static const struct input_device_id rfkill_ids[] = {
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT(EV_KEY) },
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.keybit = { [LONG(KEY_WLAN)] = BIT(KEY_WLAN) },
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},
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT(EV_KEY) },
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.keybit = { [LONG(KEY_BLUETOOTH)] = BIT(KEY_BLUETOOTH) },
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},
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{ }
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};
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static struct input_handler rfkill_handler = {
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.event = rfkill_event,
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.connect = rfkill_connect,
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.disconnect = rfkill_disconnect,
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.name = "rfkill",
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.id_table = rfkill_ids,
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};
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static int __init rfkill_handler_init(void)
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{
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return input_register_handler(&rfkill_handler);
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}
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static void __exit rfkill_handler_exit(void)
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{
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input_unregister_handler(&rfkill_handler);
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flush_scheduled_work();
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}
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module_init(rfkill_handler_init);
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module_exit(rfkill_handler_exit);
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