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/*
* Copyright (C) 2016 Motorola Mobility, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/mods/modbus_ext.h>
static DEFINE_MUTEX(modbus_ext_mutex);
static BLOCKING_NOTIFIER_HEAD(modbus_ext_notifier_list);
static struct modbus_ext_status modbus_ext_current_status;
/*
* Add caller to receive notifications of changes in attach state.
*/
int modbus_ext_register_notifier(struct notifier_block *nb,
modbus_ext_cb cb)
{
int ret = blocking_notifier_chain_register(&modbus_ext_notifier_list,
nb);
if (cb && !ret) {
struct modbus_ext_status st;
mutex_lock(&modbus_ext_mutex);
st = modbus_ext_current_status;
mutex_unlock(&modbus_ext_mutex);
cb(&st);
}
return ret;
}
EXPORT_SYMBOL(modbus_ext_register_notifier);
/*
* Remove caller from receiving notifications of changes in attach state
*/
int modbus_ext_unregister_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&modbus_ext_notifier_list,
nb);
}
EXPORT_SYMBOL(modbus_ext_unregister_notifier);
/*
* Get the current attach state for the SL interface
*/
void modbus_ext_get_state(struct modbus_ext_status *status)
{
mutex_lock(&modbus_ext_mutex);
*status = modbus_ext_current_status;
mutex_unlock(&modbus_ext_mutex);
}
EXPORT_SYMBOL(modbus_ext_get_state);
/*
* Set the current attach state for the SL interface
*/
void modbus_ext_set_state(const struct modbus_ext_status *status)
{
struct modbus_ext_status st;
mutex_lock(&modbus_ext_mutex);
modbus_ext_current_status = *status;
st = *status;
mutex_unlock(&modbus_ext_mutex);
blocking_notifier_call_chain(&modbus_ext_notifier_list, st.active, &st);
}
EXPORT_SYMBOL(modbus_ext_set_state);
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