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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/*
$Header: /cvs/src/chrony/rtc.c,v 1.14 2003/09/22 21:22:30 richard Exp $
=======================================================================
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Richard P. Curnow 1997-2003
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
**********************************************************************
=======================================================================
*/
#include "sysincl.h"
#include "rtc.h"
#include "logging.h"
#include "conf.h"
#if defined LINUX
#include "rtc_linux.h"
#endif /* defined LINUX */
/* ================================================== */
static int driver_initialised = 0;
static struct {
int (*init)(void);
void (*fini)(void);
void (*time_pre_init)(void);
void (*time_init)(void (*after_hook)(void*), void *anything);
void (*start_measurements)(void);
int (*write_parameters)(void);
int (*get_report)(RPT_RTC_Report *report);
int (*trim)(void);
void (*cycle_logfile)(void);
} driver =
{
#if defined LINUX
RTC_Linux_Initialise,
RTC_Linux_Finalise,
RTC_Linux_TimePreInit,
RTC_Linux_TimeInit,
RTC_Linux_StartMeasurements,
RTC_Linux_WriteParameters,
RTC_Linux_GetReport,
RTC_Linux_Trim,
RTC_Linux_CycleLogFile
#else
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL
#endif
};
/* ================================================== */
void
RTC_Initialise(void)
{
char *file_name;
int ok;
/* This is how we tell whether the user wants to load the RTC
driver, if he is on a machine where it is an option. */
file_name = CNF_GetRtcFile();
if (file_name) {
if (driver.init) {
if ((driver.init)()) {
ok = 1;
} else {
ok = 0;
}
} else {
ok = 0;
}
if (ok) {
driver_initialised = 1;
} else {
driver_initialised = 0;
LOG(LOGS_ERR, LOGF_Rtc, "Real time clock not supported on this operating system");
}
} else {
driver_initialised = 0;
}
return;
}
/* ================================================== */
void
RTC_Finalise(void)
{
if (driver.fini) {
(driver.fini)();
}
}
/* ================================================== */
/* Start the processing to get a single measurement from the real time
clock, and use it to trim the system time, based on knowing the
drift rate of the RTC and the error the last time we set it. The
TimePreInit routine has already run, so we can be sure that the
trim required is not *too* large.
We are called with a hook to a function to be called after the
initialisation is complete. We also call this if we cannot do the
initialisation. */
void
RTC_TimeInit(void (*after_hook)(void *), void *anything)
{
if (driver_initialised) {
(driver.time_init)(after_hook, anything);
} else {
LOG(LOGS_ERR, LOGF_Rtc, "Can't initialise from real time clock, driver not loaded");
(after_hook)(anything);
}
}
/* ================================================== */
/* Do an initial read of the RTC and set the system time to it. This
is analogous to what /sbin/clock -s -u would do on Linux. */
void
RTC_TimePreInit(void)
{
if (driver.time_pre_init) {
(driver.time_pre_init)();
}
}
/* ================================================== */
/* Start the RTC measurement process */
void
RTC_StartMeasurements(void)
{
if (driver_initialised) {
(driver.start_measurements)();
}
/* Benign if driver not present */
}
/* ================================================== */
/* Write RTC information out to RTC file. Return 0 for success, 1 if
RTC driver not running, or 2 if the file cannot be written. */
int
RTC_WriteParameters(void)
{
if (driver_initialised) {
return (driver.write_parameters)();
} else {
return RTC_ST_NODRV;
}
}
/* ================================================== */
int
RTC_GetReport(RPT_RTC_Report *report)
{
if (driver_initialised) {
return (driver.get_report)(report);
} else {
return 0;
}
}
/* ================================================== */
int
RTC_Trim(void)
{
if (driver_initialised) {
return (driver.trim)();
} else {
return 0;
}
}
/* ================================================== */
void
RTC_CycleLogFile(void)
{
if (driver_initialised) {
(driver.cycle_logfile)();
}
}
/* ================================================== */
|
