59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
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/* Copyright (c) 2020, The Linux Foundation. All rights reserved.
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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 version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/msm_drm_notify.h>
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static BLOCKING_NOTIFIER_HEAD(msm_drm_notifier_list);
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/**
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* msm_drm_register_client - register a client notifier
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* @nb: notifier block to callback on events
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*
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* This function registers a notifier callback function
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* to msm_drm_notifier_list, which would be called when
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* received unblank/power down event.
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*/
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int msm_drm_register_client(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&msm_drm_notifier_list,
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nb);
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}
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EXPORT_SYMBOL(msm_drm_register_client);
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/**
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* msm_drm_unregister_client - unregister a client notifier
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* @nb: notifier block to callback on events
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*
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* This function unregisters the callback function from
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* msm_drm_notifier_list.
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*/
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int msm_drm_unregister_client(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&msm_drm_notifier_list,
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nb);
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}
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EXPORT_SYMBOL(msm_drm_unregister_client);
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/**
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* msm_drm_notifier_call_chain - notify clients of drm_events
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* @val: event MSM_DRM_EARLY_EVENT_BLANK or MSM_DRM_EVENT_BLANK
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* @v: notifier data, inculde display id and display blank
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* event(unblank or power down).
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*/
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int msm_drm_notifier_call_chain(unsigned long val, void *v)
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{
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return blocking_notifier_call_chain(&msm_drm_notifier_list, val,
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v);
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}
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EXPORT_SYMBOL(msm_drm_notifier_call_chain);
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