1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/*
* PTP 1588 clock support
*
* Copyright (C) 2010 OMICRON electronics GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _PTP_CLOCK_KERNEL_H_
#define _PTP_CLOCK_KERNEL_H_
#include <linux/ptp_clock.h>
struct ptp_clock_request {
enum {
PTP_CLK_REQ_EXTTS,
PTP_CLK_REQ_PEROUT,
PTP_CLK_REQ_PPS,
} type;
union {
struct ptp_extts_request extts;
struct ptp_perout_request perout;
};
};
/**
* struct ptp_clock_info - decribes a PTP hardware clock
*
* @owner: The clock driver should set to THIS_MODULE.
* @name: A short name to identify the clock.
* @max_adj: The maximum possible frequency adjustment, in parts per billon.
* @n_alarm: The number of programmable alarms.
* @n_ext_ts: The number of external time stamp channels.
* @n_per_out: The number of programmable periodic signals.
* @pps: Indicates whether the clock supports a PPS callback.
*
* clock operations
*
* @adjfreq: Adjusts the frequency of the hardware clock.
* parameter delta: Desired period change in parts per billion.
*
* @adjtime: Shifts the time of the hardware clock.
* parameter delta: Desired change in nanoseconds.
*
* @gettime: Reads the current time from the hardware clock.
* parameter ts: Holds the result.
*
* @settime: Set the current time on the hardware clock.
* parameter ts: Time value to set.
*
* @enable: Request driver to enable or disable an ancillary feature.
* parameter request: Desired resource to enable or disable.
* parameter on: Caller passes one to enable or zero to disable.
*
* Drivers should embed their ptp_clock_info within a private
* structure, obtaining a reference to it using container_of().
*
* The callbacks must all return zero on success, non-zero otherwise.
*/
struct ptp_clock_info {
struct module *owner;
char name[16];
s32 max_adj;
int n_alarm;
int n_ext_ts;
int n_per_out;
int pps;
int (*adjfreq)(struct ptp_clock_info *ptp, s32 delta);
int (*adjtime)(struct ptp_clock_info *ptp, s64 delta);
int (*gettime)(struct ptp_clock_info *ptp, struct timespec *ts);
int (*settime)(struct ptp_clock_info *ptp, const struct timespec *ts);
int (*enable)(struct ptp_clock_info *ptp,
struct ptp_clock_request *request, int on);
};
struct ptp_clock;
/**
* ptp_clock_register() - register a PTP hardware clock driver
*
* @info: Structure describing the new clock.
*/
extern struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info);
/**
* ptp_clock_unregister() - unregister a PTP hardware clock driver
*
* @ptp: The clock to remove from service.
*/
extern int ptp_clock_unregister(struct ptp_clock *ptp);
enum ptp_clock_events {
PTP_CLOCK_ALARM,
PTP_CLOCK_EXTTS,
PTP_CLOCK_PPS,
};
/**
* struct ptp_clock_event - decribes a PTP hardware clock event
*
* @type: One of the ptp_clock_events enumeration values.
* @index: Identifies the source of the event.
* @timestamp: When the event occured.
*/
struct ptp_clock_event {
int type;
int index;
u64 timestamp;
};
/**
* ptp_clock_event() - notify the PTP layer about an event
*
* @ptp: The clock obtained from ptp_clock_register().
* @event: Message structure describing the event.
*/
extern void ptp_clock_event(struct ptp_clock *ptp,
struct ptp_clock_event *event);
/**
* ptp_clock_index() - obtain the device index of a PTP clock
*
* @ptp: The clock obtained from ptp_clock_register().
*/
extern int ptp_clock_index(struct ptp_clock *ptp);
#endif
|
