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//=========================================================
// 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 Werner Schweer (werner@seh.de)
// (C) Copyright 2004 Robert Jonsson (rj@spamatica.se)
//
// 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; 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
//=========================================================
#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"
namespace MusECore {
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;
}
MusEGlobal::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");
MusEGlobal::undoSetuid();
return timerFd;
}
if (!setTimerFreq(MusEGlobal::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 freq %d on /dev/rtc: %s\n", freq,
strerror(errno));
fprintf(stderr, " precise timer not available, check file permissions and allowed RTC freq (/sys/class/rtc/rtc0/max_user_freq)\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 < 0)
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");
MusEGlobal::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;
}
} // namespace MusECore
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