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140 lines
3.6 KiB
140 lines
3.6 KiB
/* |
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* PPS API kernel header |
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* |
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* Copyright (C) 2009 Rodolfo Giometti <giometti@linux.it> |
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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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* 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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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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#ifndef LINUX_PPS_KERNEL_H |
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#define LINUX_PPS_KERNEL_H |
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#include <linux/pps.h> |
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#include <linux/cdev.h> |
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#include <linux/device.h> |
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#include <linux/time.h> |
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/* |
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* Global defines |
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*/ |
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struct pps_device; |
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/* The specific PPS source info */ |
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struct pps_source_info { |
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char name[PPS_MAX_NAME_LEN]; /* simbolic name */ |
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char path[PPS_MAX_NAME_LEN]; /* path of connected device */ |
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int mode; /* PPS's allowed mode */ |
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void (*echo)(struct pps_device *pps, |
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int event, void *data); /* PPS echo function */ |
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struct module *owner; |
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struct device *dev; /* Parent device for device_create */ |
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}; |
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struct pps_event_time { |
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#ifdef CONFIG_NTP_PPS |
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struct timespec64 ts_raw; |
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#endif /* CONFIG_NTP_PPS */ |
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struct timespec64 ts_real; |
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}; |
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/* The main struct */ |
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struct pps_device { |
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struct pps_source_info info; /* PSS source info */ |
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struct pps_kparams params; /* PPS's current params */ |
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__u32 assert_sequence; /* PPS' assert event seq # */ |
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__u32 clear_sequence; /* PPS' clear event seq # */ |
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struct pps_ktime assert_tu; |
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struct pps_ktime clear_tu; |
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int current_mode; /* PPS mode at event time */ |
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unsigned int last_ev; /* last PPS event id */ |
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wait_queue_head_t queue; /* PPS event queue */ |
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unsigned int id; /* PPS source unique ID */ |
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void const *lookup_cookie; /* pps_lookup_dev only */ |
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struct cdev cdev; |
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struct device *dev; |
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struct fasync_struct *async_queue; /* fasync method */ |
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spinlock_t lock; |
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}; |
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/* |
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* Global variables |
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*/ |
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extern const struct attribute_group *pps_groups[]; |
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/* |
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* Internal functions. |
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* |
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* These are not actually part of the exported API, but this is a |
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* convenient header file to put them in. |
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*/ |
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extern int pps_register_cdev(struct pps_device *pps); |
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extern void pps_unregister_cdev(struct pps_device *pps); |
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/* |
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* Exported functions |
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*/ |
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extern struct pps_device *pps_register_source( |
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struct pps_source_info *info, int default_params); |
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extern void pps_unregister_source(struct pps_device *pps); |
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extern void pps_event(struct pps_device *pps, |
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struct pps_event_time *ts, int event, void *data); |
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/* Look up a pps device by magic cookie */ |
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struct pps_device *pps_lookup_dev(void const *cookie); |
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static inline void timespec_to_pps_ktime(struct pps_ktime *kt, |
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struct timespec64 ts) |
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{ |
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kt->sec = ts.tv_sec; |
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kt->nsec = ts.tv_nsec; |
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} |
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#ifdef CONFIG_NTP_PPS |
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static inline void pps_get_ts(struct pps_event_time *ts) |
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{ |
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ktime_get_raw_and_real_ts64(&ts->ts_raw, &ts->ts_real); |
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} |
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#else /* CONFIG_NTP_PPS */ |
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static inline void pps_get_ts(struct pps_event_time *ts) |
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{ |
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ktime_get_real_ts64(&ts->ts_real); |
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} |
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#endif /* CONFIG_NTP_PPS */ |
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/* Subtract known time delay from PPS event time(s) */ |
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static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec64 delta) |
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{ |
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ts->ts_real = timespec64_sub(ts->ts_real, delta); |
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#ifdef CONFIG_NTP_PPS |
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ts->ts_raw = timespec64_sub(ts->ts_raw, delta); |
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#endif |
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} |
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#endif /* LINUX_PPS_KERNEL_H */ |
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