forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
120 lines
2.9 KiB
120 lines
2.9 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
|
/* |
|
* PPS API kernel header |
|
* |
|
* Copyright (C) 2009 Rodolfo Giometti <[email protected]> |
|
*/ |
|
|
|
#ifndef LINUX_PPS_KERNEL_H |
|
#define LINUX_PPS_KERNEL_H |
|
|
|
#include <linux/pps.h> |
|
#include <linux/cdev.h> |
|
#include <linux/device.h> |
|
#include <linux/time.h> |
|
|
|
/* |
|
* Global defines |
|
*/ |
|
|
|
struct pps_device; |
|
|
|
/* The specific PPS source info */ |
|
struct pps_source_info { |
|
char name[PPS_MAX_NAME_LEN]; /* symbolic name */ |
|
char path[PPS_MAX_NAME_LEN]; /* path of connected device */ |
|
int mode; /* PPS allowed mode */ |
|
|
|
void (*echo)(struct pps_device *pps, |
|
int event, void *data); /* PPS echo function */ |
|
|
|
struct module *owner; |
|
struct device *dev; /* Parent device for device_create */ |
|
}; |
|
|
|
struct pps_event_time { |
|
#ifdef CONFIG_NTP_PPS |
|
struct timespec64 ts_raw; |
|
#endif /* CONFIG_NTP_PPS */ |
|
struct timespec64 ts_real; |
|
}; |
|
|
|
/* The main struct */ |
|
struct pps_device { |
|
struct pps_source_info info; /* PSS source info */ |
|
|
|
struct pps_kparams params; /* PPS current params */ |
|
|
|
__u32 assert_sequence; /* PPS assert event seq # */ |
|
__u32 clear_sequence; /* PPS clear event seq # */ |
|
struct pps_ktime assert_tu; |
|
struct pps_ktime clear_tu; |
|
int current_mode; /* PPS mode at event time */ |
|
|
|
unsigned int last_ev; /* last PPS event id */ |
|
wait_queue_head_t queue; /* PPS event queue */ |
|
|
|
unsigned int id; /* PPS source unique ID */ |
|
void const *lookup_cookie; /* For pps_lookup_dev() only */ |
|
struct cdev cdev; |
|
struct device *dev; |
|
struct fasync_struct *async_queue; /* fasync method */ |
|
spinlock_t lock; |
|
}; |
|
|
|
/* |
|
* Global variables |
|
*/ |
|
|
|
extern const struct attribute_group *pps_groups[]; |
|
|
|
/* |
|
* Internal functions. |
|
* |
|
* These are not actually part of the exported API, but this is a |
|
* convenient header file to put them in. |
|
*/ |
|
|
|
extern int pps_register_cdev(struct pps_device *pps); |
|
extern void pps_unregister_cdev(struct pps_device *pps); |
|
|
|
/* |
|
* Exported functions |
|
*/ |
|
|
|
extern struct pps_device *pps_register_source( |
|
struct pps_source_info *info, int default_params); |
|
extern void pps_unregister_source(struct pps_device *pps); |
|
extern void pps_event(struct pps_device *pps, |
|
struct pps_event_time *ts, int event, void *data); |
|
/* Look up a pps_device by magic cookie */ |
|
struct pps_device *pps_lookup_dev(void const *cookie); |
|
|
|
static inline void timespec_to_pps_ktime(struct pps_ktime *kt, |
|
struct timespec64 ts) |
|
{ |
|
kt->sec = ts.tv_sec; |
|
kt->nsec = ts.tv_nsec; |
|
} |
|
|
|
static inline void pps_get_ts(struct pps_event_time *ts) |
|
{ |
|
struct system_time_snapshot snap; |
|
|
|
ktime_get_snapshot(&snap); |
|
ts->ts_real = ktime_to_timespec64(snap.real); |
|
#ifdef CONFIG_NTP_PPS |
|
ts->ts_raw = ktime_to_timespec64(snap.raw); |
|
#endif |
|
} |
|
|
|
/* Subtract known time delay from PPS event time(s) */ |
|
static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec64 delta) |
|
{ |
|
ts->ts_real = timespec64_sub(ts->ts_real, delta); |
|
#ifdef CONFIG_NTP_PPS |
|
ts->ts_raw = timespec64_sub(ts->ts_raw, delta); |
|
#endif |
|
} |
|
|
|
#endif /* LINUX_PPS_KERNEL_H */
|
|
|