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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
32
33
34struct pps_device;
35
36
37struct pps_source_info {
38 char name[PPS_MAX_NAME_LEN];
39 char path[PPS_MAX_NAME_LEN];
40 int mode;
41
42 void (*echo)(struct pps_device *pps,
43 int event, void *data);
44
45 struct module *owner;
46 struct device *dev;
47};
48
49struct pps_event_time {
50#ifdef CONFIG_NTP_PPS
51 struct timespec ts_raw;
52#endif
53 struct timespec ts_real;
54};
55
56
57struct pps_device {
58 struct pps_source_info info;
59
60 struct pps_kparams params;
61
62 __u32 assert_sequence;
63 __u32 clear_sequence;
64 struct pps_ktime assert_tu;
65 struct pps_ktime clear_tu;
66 int current_mode;
67
68 unsigned int last_ev;
69 wait_queue_head_t queue;
70
71 unsigned int id;
72 void const *lookup_cookie;
73 struct cdev cdev;
74 struct device *dev;
75 struct fasync_struct *async_queue;
76 spinlock_t lock;
77};
78
79
80
81
82
83extern const struct attribute_group *pps_groups[];
84
85
86
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89
90
91
92extern int pps_register_cdev(struct pps_device *pps);
93extern void pps_unregister_cdev(struct pps_device *pps);
94
95
96
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
105struct pps_device *pps_lookup_dev(void const *cookie);
106
107static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
108 struct timespec ts)
109{
110 kt->sec = ts.tv_sec;
111 kt->nsec = ts.tv_nsec;
112}
113
114#ifdef CONFIG_NTP_PPS
115
116static inline void pps_get_ts(struct pps_event_time *ts)
117{
118 getnstime_raw_and_real(&ts->ts_raw, &ts->ts_real);
119}
120
121#else
122
123static inline void pps_get_ts(struct pps_event_time *ts)
124{
125 getnstimeofday(&ts->ts_real);
126}
127
128#endif
129
130
131static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec delta)
132{
133 ts->ts_real = timespec_sub(ts->ts_real, delta);
134#ifdef CONFIG_NTP_PPS
135 ts->ts_raw = timespec_sub(ts->ts_raw, delta);
136#endif
137}
138
139#endif
140
141