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
|
//=========================================================
// MusE
// Linux Music Editor
// $Id: rtctimer.cpp,v 1.1.2.11 2009/03/09 02:05:18 terminator356 Exp $
//
// Most code moved from midiseq.cpp by Werner Schweer.
//
// (C) Copyright 2004 Robert Jonsson (rj@spamatica.se)
// (C) Copyright -2004 Werner Schweer (werner@seh.de)
//=========================================================
#include <linux/version.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0)
#include <linux/spinlock.h>
#include <linux/mc146818rtc.h>
#else
#include <linux/rtc.h>
#endif
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <poll.h>
#include "rtctimer.h"
#include "globals.h"
#include "gconfig.h"
RtcTimer::RtcTimer()
{
timerFd = -1;
}
RtcTimer::~RtcTimer()
{
if (timerFd != -1)
close(timerFd);
}
signed int RtcTimer::initTimer()
{
if(TIMER_DEBUG)
printf("RtcTimer::initTimer()\n");
if (timerFd != -1) {
fprintf(stderr,"RtcTimer::initTimer(): called on initialised timer!\n");
return -1;
}
doSetuid();
timerFd = ::open("/dev/rtc", O_RDONLY);
if (timerFd == -1) {
fprintf(stderr, "fatal error: open /dev/rtc failed: %s\n", strerror(errno));
fprintf(stderr, "hint: check if 'rtc' kernel module is loaded, or used by something else\n");
undoSetuid();
return timerFd;
}
if (!setTimerFreq(config.rtcTicks)) {
// unable to set timer frequency
return -1;
}
// check if timer really works, start and stop it once.
if (!startTimer()) {
return -1;
}
if (!stopTimer()) {
return -1;
}
return timerFd;
}
unsigned int RtcTimer::setTimerResolution(unsigned int resolution)
{
if(TIMER_DEBUG)
printf("RtcTimer::setTimerResolution(%d)\n",resolution);
/* The RTC can take power-of-two frequencies from 2 to 8196 Hz.
* It doesn't really have a resolution as such.
*/
return 0;
}
unsigned int RtcTimer::setTimerFreq(unsigned int freq)
{
int rc = ioctl(timerFd, RTC_IRQP_SET, freq);
if (rc == -1) {
fprintf(stderr, "RtcTimer::setTimerFreq(): cannot set tick on /dev/rtc: %s\n",
strerror(errno));
fprintf(stderr, " precise timer not available\n");
return 0;
}
return freq;
}
unsigned int RtcTimer::getTimerResolution()
{
/* The RTC doesn't really work with a set resolution as such.
* Not sure how this fits into things yet.
*/
return 0;
}
unsigned int RtcTimer::getTimerFreq()
{
unsigned int freq;
int rv = ioctl(timerFd, RTC_IRQP_READ, &freq);
if (rv < 1)
return 0;
return freq;
}
bool RtcTimer::startTimer()
{
if(TIMER_DEBUG)
printf("RtcTimer::startTimer()\n");
if (timerFd == -1) {
fprintf(stderr, "RtcTimer::startTimer(): no timer open to start!\n");
return false;
}
if (ioctl(timerFd, RTC_PIE_ON, 0) == -1) {
perror("MidiThread: start: RTC_PIE_ON failed");
undoSetuid();
return false;
}
return true;
}
bool RtcTimer::stopTimer()
{
if(TIMER_DEBUG)
printf("RtcTimer::stopTimer\n");
if (timerFd != -1) {
ioctl(timerFd, RTC_PIE_OFF, 0);
}
else {
fprintf(stderr,"RtcTimer::stopTimer(): no RTC to stop!\n");
return false;
}
return true;
}
unsigned int RtcTimer::getTimerTicks(bool /*printTicks*/)// prevent compiler warning: unused parameter
{
if(TIMER_DEBUG)
printf("getTimerTicks()\n");
unsigned long int nn;
if (timerFd==-1) {
fprintf(stderr,"RtcTimer::getTimerTicks(): no RTC open to read!\n");
return 0;
}
if (read(timerFd, &nn, sizeof(unsigned long)) != sizeof(unsigned long)) {
fprintf(stderr,"RtcTimer::getTimerTicks(): error reading RTC\n");
return 0;
}
return nn;
}
|
