70 lines
1.6 KiB
C
Executable File
70 lines
1.6 KiB
C
Executable File
/*
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* linux/driver/arisc/arisc-notifer.c
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*
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* Copyright(c) 2013-2015 Allwinnertech Co., Ltd.
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* http://www.allwinnertech.com
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*
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* Author: sunny <sunny@allwinnertech.com>
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*
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* arisc notifier framework.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/notifier.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <linux/arisc/arisc-notifier.h>
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/* arisc notifer */
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static RAW_NOTIFIER_HEAD(arisc_notifier);
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/* Serializes the operations to arisc_notifier */
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static DEFINE_MUTEX(arisc_notifier_mutex);
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/*
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* The following two API's must be used when attempting
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* to serialize the operations to arisc_notifier.
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*/
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static void arisc_notifier_lock(void)
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{
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mutex_lock(&arisc_notifier_mutex);
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}
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static void arisc_notifier_unlock(void)
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{
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mutex_unlock(&arisc_notifier_mutex);
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}
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int arisc_register_notifier(struct notifier_block *nb)
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{
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int ret;
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arisc_notifier_lock();
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ret = raw_notifier_chain_register(&arisc_notifier, nb);
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arisc_notifier_unlock();
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return ret;
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}
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EXPORT_SYMBOL(arisc_register_notifier);
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int arisc_notify(unsigned long val, void *v)
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{
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int ret;
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ret = __raw_notifier_call_chain(&arisc_notifier, val, v, -1, NULL);
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return notifier_to_errno(ret);
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}
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EXPORT_SYMBOL(arisc_notify);
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void arisc_unregister_notifier(struct notifier_block *nb)
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{
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arisc_notifier_lock();
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raw_notifier_chain_unregister(&arisc_notifier, nb);
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arisc_notifier_unlock();
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}
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EXPORT_SYMBOL(arisc_unregister_notifier);
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