android_kernel_samsung_sm8650-modules/dsp/msm-audio-event-notify.c

/* Copyright (c) 2018, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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 <dsp/msm-audio-event-notify.h>
#include <linux/export.h>

static ATOMIC_NOTIFIER_HEAD(msm_aud_evt_notifier_list);

/**
 *	msm_aud_evt_register_client - register a client notifier
 *	@nb: notifier block to callback on events
 */
int msm_aud_evt_register_client(struct notifier_block *nb)
{
	return atomic_notifier_chain_register(&msm_aud_evt_notifier_list, nb);
}
EXPORT_SYMBOL(msm_aud_evt_register_client);

/**
 *	msm_aud_evt_unregister_client - unregister a client notifier
 *	@nb: notifier block to callback on events
 */
int msm_aud_evt_unregister_client(struct notifier_block *nb)
{
	return atomic_notifier_chain_unregister(&msm_aud_evt_notifier_list, nb);
}
EXPORT_SYMBOL(msm_aud_evt_unregister_client);

/**
 * msm_aud_evt_notifier_call_chain - notify clients of fb_events
 *
 */
int msm_aud_evt_notifier_call_chain(unsigned long val, void *v)
{
	return atomic_notifier_call_chain(&msm_aud_evt_notifier_list, val, v);
}
EXPORT_SYMBOL_GPL(msm_aud_evt_notifier_call_chain);