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1 | /* |
2 | * PPS API header |
3 | * |
4 | * Copyright (C) 2005-2009 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 | |
22 | #ifndef _PPS_H_ |
23 | #define _PPS_H_ |
24 | |
25 | #include <linux/types.h> |
26 | |
27 | #define PPS_VERSION "5.3.6" |
28 | #define PPS_MAX_SOURCES 16 /* should be enough... */ |
29 | |
30 | /* Implementation note: the logical states ``assert'' and ``clear'' |
31 | * are implemented in terms of the chip register, i.e. ``assert'' |
32 | * means the bit is set. */ |
33 | |
34 | /* |
35 | * 3.2 New data structures |
36 | */ |
37 | |
38 | #define PPS_API_VERS_1 1 |
39 | #define PPS_API_VERS PPS_API_VERS_1 /* we use API version 1 */ |
40 | #define PPS_MAX_NAME_LEN 32 |
41 | |
42 | /* 32-bit vs. 64-bit compatibility. |
43 | * |
44 | * 0n i386, the alignment of a uint64_t is only 4 bytes, while on most other |
45 | * architectures it's 8 bytes. On i386, there will be no padding between the |
46 | * two consecutive 'struct pps_ktime' members of struct pps_kinfo and struct |
47 | * pps_kparams. But on most platforms there will be padding to ensure correct |
48 | * alignment. |
49 | * |
50 | * The simple fix is probably to add an explicit padding. |
51 | * [David Woodhouse] |
52 | */ |
53 | struct pps_ktime { |
54 | __s64 sec; |
55 | __s32 nsec; |
56 | __u32 flags; |
57 | }; |
58 | #define PPS_TIME_INVALID (1<<0) /* used to specify timeout==NULL */ |
59 | |
60 | struct pps_kinfo { |
61 | __u32 assert_sequence; /* seq. num. of assert event */ |
62 | __u32 clear_sequence; /* seq. num. of clear event */ |
63 | struct pps_ktime assert_tu; /* time of assert event */ |
64 | struct pps_ktime clear_tu; /* time of clear event */ |
65 | int current_mode; /* current mode bits */ |
66 | }; |
67 | |
68 | struct pps_kparams { |
69 | int api_version; /* API version # */ |
70 | int mode; /* mode bits */ |
71 | struct pps_ktime assert_off_tu; /* offset compensation for assert */ |
72 | struct pps_ktime clear_off_tu; /* offset compensation for clear */ |
73 | }; |
74 | |
75 | /* |
76 | * 3.3 Mode bit definitions |
77 | */ |
78 | |
79 | /* Device/implementation parameters */ |
80 | #define PPS_CAPTUREASSERT 0x01 /* capture assert events */ |
81 | #define PPS_CAPTURECLEAR 0x02 /* capture clear events */ |
82 | #define PPS_CAPTUREBOTH 0x03 /* capture assert and clear events */ |
83 | |
84 | #define PPS_OFFSETASSERT 0x10 /* apply compensation for assert ev. */ |
85 | #define PPS_OFFSETCLEAR 0x20 /* apply compensation for clear ev. */ |
86 | |
87 | #define PPS_CANWAIT 0x100 /* can we wait for an event? */ |
88 | #define PPS_CANPOLL 0x200 /* bit reserved for future use */ |
89 | |
90 | /* Kernel actions */ |
91 | #define PPS_ECHOASSERT 0x40 /* feed back assert event to output */ |
92 | #define PPS_ECHOCLEAR 0x80 /* feed back clear event to output */ |
93 | |
94 | /* Timestamp formats */ |
95 | #define PPS_TSFMT_TSPEC 0x1000 /* select timespec format */ |
96 | #define PPS_TSFMT_NTPFP 0x2000 /* select NTP format */ |
97 | |
98 | /* |
99 | * 3.4.4 New functions: disciplining the kernel timebase |
100 | */ |
101 | |
102 | /* Kernel consumers */ |
103 | #define PPS_KC_HARDPPS 0 /* hardpps() (or equivalent) */ |
104 | #define PPS_KC_HARDPPS_PLL 1 /* hardpps() constrained to |
105 | use a phase-locked loop */ |
106 | #define PPS_KC_HARDPPS_FLL 2 /* hardpps() constrained to |
107 | use a frequency-locked loop */ |
108 | /* |
109 | * Here begins the implementation-specific part! |
110 | */ |
111 | |
112 | struct pps_fdata { |
113 | struct pps_kinfo info; |
114 | struct pps_ktime timeout; |
115 | }; |
116 | |
117 | #include <linux/ioctl.h> |
118 | |
119 | #define PPS_GETPARAMS _IOR('p', 0xa1, struct pps_kparams *) |
120 | #define PPS_SETPARAMS _IOW('p', 0xa2, struct pps_kparams *) |
121 | #define PPS_GETCAP _IOR('p', 0xa3, int *) |
122 | #define PPS_FETCH _IOWR('p', 0xa4, struct pps_fdata *) |
123 | |
124 | #endif /* _PPS_H_ */ |
125 |
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