/* * 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){	unsigned long last_run = jiffies - msecs_to_jiffies(500);	rfkill_wlan.last = last_run;	rfkill_bt.last = last_run;	rfkill_uwb.last = last_run;	rfkill_wimax.last = last_run;	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);