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/*
* include/linux/platform/tegra/ptp-notifier.h
*
* Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __PTP_NOTIFIER_H
#define __PTP_NOTIFIER_H
#if IS_ENABLED(CONFIG_TEGRA_PTP_NOTIFIER)
/* register / unregister HW time source */
void tegra_register_hwtime_source(u64 (*func)(void *), void *data);
void tegra_unregister_hwtime_source(void);
/* clients registering / unregistering for time update events */
int tegra_register_hwtime_notifier(struct notifier_block *nb);
int tegra_unregister_hwtime_notifier(struct notifier_block *nb);
/* Notify time updates to registered clients */
int tegra_hwtime_notifier_call_chain(unsigned int val, void *v);
/*
* Get HW time counter.
* Clients may call the API every anytime PTP time is needed.
* If HW time source is not registered, returns -EINVAL
*/
int get_ptp_hwtime(u64 *ns);
#else /* CONFIG_TEGRA_PTP_NOTIFIER */
/* register / unregister HW time source */
static inline void tegra_register_hwtime_source(u64 (*func)(void *),
void *data)
{
}
static inline void tegra_unregister_hwtime_source(void)
{
}
/* clients registering / unregistering for time update events */
static inline int tegra_register_hwtime_notifier(struct notifier_block *nb)
{
return 0;
}
static inline int tegra_unregister_hwtime_notifier(struct notifier_block *nb)
{
return -ENOENT;
}
/* Notify time updates to registered clients */
static inline int tegra_hwtime_notifier_call_chain(unsigned int val, void *v)
{
return notifier_to_errno(NOTIFY_DONE);
}
/*
* Get HW time counter.
* Clients may call the API every anytime PTP time is needed.
* If HW time source is not registered, returns -EINVAL
*/
static inline int get_ptp_hwtime(u64 *ns)
{
return -EINVAL;
}
#endif /* CONFIG_TEGRA_PTP_NOTIFIER */
#endif /* __PTP_NOTIFIER_H */
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