83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
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/*
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* include/linux/platform/tegra/ptp-notifier.h
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*
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* Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __PTP_NOTIFIER_H
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#define __PTP_NOTIFIER_H
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#if IS_ENABLED(CONFIG_TEGRA_PTP_NOTIFIER)
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/* register / unregister HW time source */
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void tegra_register_hwtime_source(u64 (*func)(void *), void *data);
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void tegra_unregister_hwtime_source(void);
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/* clients registering / unregistering for time update events */
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int tegra_register_hwtime_notifier(struct notifier_block *nb);
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int tegra_unregister_hwtime_notifier(struct notifier_block *nb);
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/* Notify time updates to registered clients */
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int tegra_hwtime_notifier_call_chain(unsigned int val, void *v);
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/*
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* Get HW time counter.
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* Clients may call the API every anytime PTP time is needed.
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* If HW time source is not registered, returns -EINVAL
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*/
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int get_ptp_hwtime(u64 *ns);
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#else /* CONFIG_TEGRA_PTP_NOTIFIER */
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/* register / unregister HW time source */
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static inline void tegra_register_hwtime_source(u64 (*func)(void *),
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void *data)
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{
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}
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static inline void tegra_unregister_hwtime_source(void)
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{
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}
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/* clients registering / unregistering for time update events */
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static inline int tegra_register_hwtime_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline int tegra_unregister_hwtime_notifier(struct notifier_block *nb)
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{
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return -ENOENT;
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}
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/* Notify time updates to registered clients */
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static inline int tegra_hwtime_notifier_call_chain(unsigned int val, void *v)
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{
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return notifier_to_errno(NOTIFY_DONE);
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}
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/*
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* Get HW time counter.
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* Clients may call the API every anytime PTP time is needed.
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* If HW time source is not registered, returns -EINVAL
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*/
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static inline int get_ptp_hwtime(u64 *ns)
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{
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return -EINVAL;
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}
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#endif /* CONFIG_TEGRA_PTP_NOTIFIER */
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#endif /* __PTP_NOTIFIER_H */
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