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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * PPS API kernel header
4 *
5 * Copyright (C) 2009 Rodolfo Giometti <giometti@linux.it>
6 */
7
8#ifndef LINUX_PPS_KERNEL_H
9#define LINUX_PPS_KERNEL_H
10
11#include <linux/pps.h>
12#include <linux/cdev.h>
13#include <linux/device.h>
14#include <linux/time.h>
15
16/*
17 * Global defines
18 */
19
20struct pps_device;
21
22/* The specific PPS source info */
23struct pps_source_info {
24 char name[PPS_MAX_NAME_LEN]; /* symbolic name */
25 char path[PPS_MAX_NAME_LEN]; /* path of connected device */
26 int mode; /* PPS allowed mode */
27
28 void (*echo)(struct pps_device *pps,
29 int event, void *data); /* PPS echo function */
30
31 struct module *owner;
32 struct device *dev; /* Parent device for device_create */
33};
34
35struct pps_event_time {
36#ifdef CONFIG_NTP_PPS
37 struct timespec64 ts_raw;
38#endif /* CONFIG_NTP_PPS */
39 struct timespec64 ts_real;
40};
41
42/* The main struct */
43struct pps_device {
44 struct pps_source_info info; /* PSS source info */
45
46 struct pps_kparams params; /* PPS current params */
47
48 __u32 assert_sequence; /* PPS assert event seq # */
49 __u32 clear_sequence; /* PPS clear event seq # */
50 struct pps_ktime assert_tu;
51 struct pps_ktime clear_tu;
52 int current_mode; /* PPS mode at event time */
53
54 unsigned int last_ev; /* last PPS event id */
55 wait_queue_head_t queue; /* PPS event queue */
56
57 unsigned int id; /* PPS source unique ID */
58 void const *lookup_cookie; /* For pps_lookup_dev() only */
59 struct cdev cdev;
60 struct device *dev;
61 struct fasync_struct *async_queue; /* fasync method */
62 spinlock_t lock;
63};
64
65/*
66 * Global variables
67 */
68
69extern const struct attribute_group *pps_groups[];
70
71/*
72 * Internal functions.
73 *
74 * These are not actually part of the exported API, but this is a
75 * convenient header file to put them in.
76 */
77
78extern int pps_register_cdev(struct pps_device *pps);
79extern void pps_unregister_cdev(struct pps_device *pps);
80
81/*
82 * Exported functions
83 */
84
85extern struct pps_device *pps_register_source(
86 struct pps_source_info *info, int default_params);
87extern void pps_unregister_source(struct pps_device *pps);
88extern void pps_event(struct pps_device *pps,
89 struct pps_event_time *ts, int event, void *data);
90/* Look up a pps_device by magic cookie */
91struct pps_device *pps_lookup_dev(void const *cookie);
92
93static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
94 struct timespec64 ts)
95{
96 kt->sec = ts.tv_sec;
97 kt->nsec = ts.tv_nsec;
98}
99
100static inline void pps_get_ts(struct pps_event_time *ts)
101{
102 struct system_time_snapshot snap;
103
104 ktime_get_snapshot(&snap);
105 ts->ts_real = ktime_to_timespec64(snap.real);
106#ifdef CONFIG_NTP_PPS
107 ts->ts_raw = ktime_to_timespec64(snap.raw);
108#endif
109}
110
111/* Subtract known time delay from PPS event time(s) */
112static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec64 delta)
113{
114 ts->ts_real = timespec64_sub(ts->ts_real, delta);
115#ifdef CONFIG_NTP_PPS
116 ts->ts_raw = timespec64_sub(ts->ts_raw, delta);
117#endif
118}
119
120#endif /* LINUX_PPS_KERNEL_H */
1/*
2 * PPS API kernel header
3 *
4 * Copyright (C) 2009 Rodolfo Giometti <giometti@linux.it>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21#ifndef LINUX_PPS_KERNEL_H
22#define LINUX_PPS_KERNEL_H
23
24#include <linux/pps.h>
25
26#include <linux/cdev.h>
27#include <linux/device.h>
28#include <linux/time.h>
29
30/*
31 * Global defines
32 */
33
34struct pps_device;
35
36/* The specific PPS source info */
37struct pps_source_info {
38 char name[PPS_MAX_NAME_LEN]; /* simbolic name */
39 char path[PPS_MAX_NAME_LEN]; /* path of connected device */
40 int mode; /* PPS's allowed mode */
41
42 void (*echo)(struct pps_device *pps,
43 int event, void *data); /* PPS echo function */
44
45 struct module *owner;
46 struct device *dev; /* Parent device for device_create */
47};
48
49struct pps_event_time {
50#ifdef CONFIG_NTP_PPS
51 struct timespec64 ts_raw;
52#endif /* CONFIG_NTP_PPS */
53 struct timespec64 ts_real;
54};
55
56/* The main struct */
57struct pps_device {
58 struct pps_source_info info; /* PSS source info */
59
60 struct pps_kparams params; /* PPS's current params */
61
62 __u32 assert_sequence; /* PPS' assert event seq # */
63 __u32 clear_sequence; /* PPS' clear event seq # */
64 struct pps_ktime assert_tu;
65 struct pps_ktime clear_tu;
66 int current_mode; /* PPS mode at event time */
67
68 unsigned int last_ev; /* last PPS event id */
69 wait_queue_head_t queue; /* PPS event queue */
70
71 unsigned int id; /* PPS source unique ID */
72 void const *lookup_cookie; /* pps_lookup_dev only */
73 struct cdev cdev;
74 struct device *dev;
75 struct fasync_struct *async_queue; /* fasync method */
76 spinlock_t lock;
77};
78
79/*
80 * Global variables
81 */
82
83extern const struct attribute_group *pps_groups[];
84
85/*
86 * Internal functions.
87 *
88 * These are not actually part of the exported API, but this is a
89 * convenient header file to put them in.
90 */
91
92extern int pps_register_cdev(struct pps_device *pps);
93extern void pps_unregister_cdev(struct pps_device *pps);
94
95/*
96 * Exported functions
97 */
98
99extern struct pps_device *pps_register_source(
100 struct pps_source_info *info, int default_params);
101extern void pps_unregister_source(struct pps_device *pps);
102extern void pps_event(struct pps_device *pps,
103 struct pps_event_time *ts, int event, void *data);
104/* Look up a pps device by magic cookie */
105struct pps_device *pps_lookup_dev(void const *cookie);
106
107static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
108 struct timespec64 ts)
109{
110 kt->sec = ts.tv_sec;
111 kt->nsec = ts.tv_nsec;
112}
113
114static inline void pps_get_ts(struct pps_event_time *ts)
115{
116 struct system_time_snapshot snap;
117
118 ktime_get_snapshot(&snap);
119 ts->ts_real = ktime_to_timespec64(snap.real);
120#ifdef CONFIG_NTP_PPS
121 ts->ts_raw = ktime_to_timespec64(snap.raw);
122#endif
123}
124
125/* Subtract known time delay from PPS event time(s) */
126static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec64 delta)
127{
128 ts->ts_real = timespec64_sub(ts->ts_real, delta);
129#ifdef CONFIG_NTP_PPS
130 ts->ts_raw = timespec64_sub(ts->ts_raw, delta);
131#endif
132}
133
134#endif /* LINUX_PPS_KERNEL_H */
135