Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * 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 "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 */

        enum rfkill_state current_state; /* on/off */

};

static void rfkill_task_handler(struct work_struct *work)

{

        struct rfkill_task *task = container_of(work, struct rfkill_task, work);

        enum rfkill_state state;

        mutex_lock(&task->mutex);

        /*

         * Use temp variable to fetch desired state to keep it

         * consistent even if rfkill_schedule_toggle() runs in

         * another thread or interrupts us.

         */

        state = task->desired_state;

        if (state != task->current_state) {

                rfkill_switch_all(task->type, state);

                task->current_state = state;

        }

        mutex_unlock(&task->mutex);

}

static void rfkill_schedule_toggle(struct rfkill_task *task)

{

        unsigned long flags;

        spin_lock_irqsave(&task->lock, flags);

        if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {

                task->desired_state = !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_ON,       \

                .current_state = RFKILL_STATE_ON,       \

        }

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 void rfkill_event(struct input_handle *handle, unsigned int type,

                        unsigned int code, int down)

{

        if (type == EV_KEY && down == 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;

                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";

        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_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) },

        },

        { }

};

static struct input_handler rfkill_handler = {

        .event =        rfkill_event,

        .connect =      rfkill_connect,

        .disconnect =   rfkill_disconnect,

        .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);