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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>
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19
20struct pps_device;
21
22
23struct pps_source_info {
24 char name[PPS_MAX_NAME_LEN];
25 char path[PPS_MAX_NAME_LEN];
26 int mode;
27
28 void (*echo)(struct pps_device *pps,
29 int event, void *data);
30
31 struct module *owner;
32 struct device *dev;
33};
34
35struct pps_event_time {
36#ifdef CONFIG_NTP_PPS
37 struct timespec64 ts_raw;
38#endif
39 struct timespec64 ts_real;
40};
41
42
43struct pps_device {
44 struct pps_source_info info;
45
46 struct pps_kparams params;
47
48 __u32 assert_sequence;
49 __u32 clear_sequence;
50 struct pps_ktime assert_tu;
51 struct pps_ktime clear_tu;
52 int current_mode;
53
54 unsigned int last_ev;
55 wait_queue_head_t queue;
56
57 unsigned int id;
58 void const *lookup_cookie;
59 struct cdev cdev;
60 struct device *dev;
61 struct fasync_struct *async_queue;
62 spinlock_t lock;
63};
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68
69extern const struct attribute_group *pps_groups[];
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77
78extern int pps_register_cdev(struct pps_device *pps);
79extern void pps_unregister_cdev(struct pps_device *pps);
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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
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
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
121