1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2/*
3 * PPS API header
4 *
5 * Copyright (C) 2005-2009 Rodolfo Giometti <giometti@linux.it>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22
23#ifndef _PPS_H_
24#define _PPS_H_
25
26#include <linux/types.h>
27
28#define PPS_VERSION "5.3.6"
29#define PPS_MAX_SOURCES 16 /* should be enough... */
30
31/* Implementation note: the logical states ``assert'' and ``clear''
32 * are implemented in terms of the chip register, i.e. ``assert''
33 * means the bit is set. */
34
35/*
36 * 3.2 New data structures
37 */
38
39#define PPS_API_VERS_1 1
40#define PPS_API_VERS PPS_API_VERS_1 /* we use API version 1 */
41#define PPS_MAX_NAME_LEN 32
42
43/* 32-bit vs. 64-bit compatibility.
44 *
45 * 0n i386, the alignment of a uint64_t is only 4 bytes, while on most other
46 * architectures it's 8 bytes. On i386, there will be no padding between the
47 * two consecutive 'struct pps_ktime' members of struct pps_kinfo and struct
48 * pps_kparams. But on most platforms there will be padding to ensure correct
49 * alignment.
50 *
51 * The simple fix is probably to add an explicit padding.
52 * [David Woodhouse]
53 */
54struct pps_ktime {
55 __s64 sec;
56 __s32 nsec;
57 __u32 flags;
58};
59
60struct pps_ktime_compat {
61 __s64 sec;
62 __s32 nsec;
63 __u32 flags;
64} __attribute__((packed, aligned(4)));
65#define PPS_TIME_INVALID (1<<0) /* used to specify timeout==NULL */
66
67struct pps_kinfo {
68 __u32 assert_sequence; /* seq. num. of assert event */
69 __u32 clear_sequence; /* seq. num. of clear event */
70 struct pps_ktime assert_tu; /* time of assert event */
71 struct pps_ktime clear_tu; /* time of clear event */
72 int current_mode; /* current mode bits */
73};
74
75struct pps_kinfo_compat {
76 __u32 assert_sequence; /* seq. num. of assert event */
77 __u32 clear_sequence; /* seq. num. of clear event */
78 struct pps_ktime_compat assert_tu; /* time of assert event */
79 struct pps_ktime_compat clear_tu; /* time of clear event */
80 int current_mode; /* current mode bits */
81};
82
83struct pps_kparams {
84 int api_version; /* API version # */
85 int mode; /* mode bits */
86 struct pps_ktime assert_off_tu; /* offset compensation for assert */
87 struct pps_ktime clear_off_tu; /* offset compensation for clear */
88};
89
90/*
91 * 3.3 Mode bit definitions
92 */
93
94/* Device/implementation parameters */
95#define PPS_CAPTUREASSERT 0x01 /* capture assert events */
96#define PPS_CAPTURECLEAR 0x02 /* capture clear events */
97#define PPS_CAPTUREBOTH 0x03 /* capture assert and clear events */
98
99#define PPS_OFFSETASSERT 0x10 /* apply compensation for assert event */
100#define PPS_OFFSETCLEAR 0x20 /* apply compensation for clear event */
101
102#define PPS_CANWAIT 0x100 /* can we wait for an event? */
103#define PPS_CANPOLL 0x200 /* bit reserved for future use */
104
105/* Kernel actions */
106#define PPS_ECHOASSERT 0x40 /* feed back assert event to output */
107#define PPS_ECHOCLEAR 0x80 /* feed back clear event to output */
108
109/* Timestamp formats */
110#define PPS_TSFMT_TSPEC 0x1000 /* select timespec format */
111#define PPS_TSFMT_NTPFP 0x2000 /* select NTP format */
112
113/*
114 * 3.4.4 New functions: disciplining the kernel timebase
115 */
116
117/* Kernel consumers */
118#define PPS_KC_HARDPPS 0 /* hardpps() (or equivalent) */
119#define PPS_KC_HARDPPS_PLL 1 /* hardpps() constrained to
120 use a phase-locked loop */
121#define PPS_KC_HARDPPS_FLL 2 /* hardpps() constrained to
122 use a frequency-locked loop */
123/*
124 * Here begins the implementation-specific part!
125 */
126
127struct pps_fdata {
128 struct pps_kinfo info;
129 struct pps_ktime timeout;
130};
131
132struct pps_fdata_compat {
133 struct pps_kinfo_compat info;
134 struct pps_ktime_compat timeout;
135};
136
137struct pps_bind_args {
138 int tsformat; /* format of time stamps */
139 int edge; /* selected event type */
140 int consumer; /* selected kernel consumer */
141};
142
143#include <linux/ioctl.h>
144
145#define PPS_GETPARAMS _IOR('p', 0xa1, struct pps_kparams *)
146#define PPS_SETPARAMS _IOW('p', 0xa2, struct pps_kparams *)
147#define PPS_GETCAP _IOR('p', 0xa3, int *)
148#define PPS_FETCH _IOWR('p', 0xa4, struct pps_fdata *)
149#define PPS_KC_BIND _IOW('p', 0xa5, struct pps_bind_args *)
150
151#endif /* _PPS_H_ */
152