2 * PPS API kernel header
4 * Copyright (C) 2009 Rodolfo Giometti <giometti@linux.it>
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.
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.
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.
21 #ifndef LINUX_PPS_KERNEL_H
22 #define LINUX_PPS_KERNEL_H
24 #include <linux/pps.h>
26 #include <linux/cdev.h>
27 #include <linux/device.h>
28 #include <linux/time.h>
36 /* The specific PPS source info */
37 struct 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 */
42 void (*echo
)(struct pps_device
*pps
,
43 int event
, void *data
); /* PPS echo function */
46 struct device
*dev
; /* Parent device for device_create */
49 struct pps_event_time
{
51 struct timespec64 ts_raw
;
52 #endif /* CONFIG_NTP_PPS */
53 struct timespec64 ts_real
;
58 struct pps_source_info info
; /* PSS source info */
60 struct pps_kparams params
; /* PPS's current params */
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 */
68 unsigned int last_ev
; /* last PPS event id */
69 wait_queue_head_t queue
; /* PPS event queue */
71 unsigned int id
; /* PPS source unique ID */
72 void const *lookup_cookie
; /* pps_lookup_dev only */
75 struct fasync_struct
*async_queue
; /* fasync method */
83 extern const struct attribute_group
*pps_groups
[];
88 * These are not actually part of the exported API, but this is a
89 * convenient header file to put them in.
92 extern int pps_register_cdev(struct pps_device
*pps
);
93 extern void pps_unregister_cdev(struct pps_device
*pps
);
99 extern struct pps_device
*pps_register_source(
100 struct pps_source_info
*info
, int default_params
);
101 extern void pps_unregister_source(struct pps_device
*pps
);
102 extern 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 */
105 struct pps_device
*pps_lookup_dev(void const *cookie
);
107 static inline void timespec_to_pps_ktime(struct pps_ktime
*kt
,
108 struct timespec64 ts
)
111 kt
->nsec
= ts
.tv_nsec
;
114 #ifdef CONFIG_NTP_PPS
116 static inline void pps_get_ts(struct pps_event_time
*ts
)
118 ktime_get_raw_and_real_ts64(&ts
->ts_raw
, &ts
->ts_real
);
121 #else /* CONFIG_NTP_PPS */
123 static inline void pps_get_ts(struct pps_event_time
*ts
)
125 ktime_get_real_ts64(&ts
->ts_real
);
128 #endif /* CONFIG_NTP_PPS */
130 /* Subtract known time delay from PPS event time(s) */
131 static inline void pps_sub_ts(struct pps_event_time
*ts
, struct timespec64 delta
)
133 ts
->ts_real
= timespec64_sub(ts
->ts_real
, delta
);
134 #ifdef CONFIG_NTP_PPS
135 ts
->ts_raw
= timespec64_sub(ts
->ts_raw
, delta
);
139 #endif /* LINUX_PPS_KERNEL_H */
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