You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
403 lines
8.6 KiB
403 lines
8.6 KiB
/*
|
|
* Real Time Clock Driver Test/Example Program
|
|
*
|
|
* Compile with:
|
|
* gcc -s -Wall -Wstrict-prototypes rtctest.c -o rtctest
|
|
*
|
|
* Copyright (C) 1996, Paul Gortmaker.
|
|
*
|
|
* Released under the GNU General Public License, version 2,
|
|
* included herein by reference.
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <linux/rtc.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
|
|
#ifndef ARRAY_SIZE
|
|
# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
|
|
#endif
|
|
|
|
/*
|
|
* This expects the new RTC class driver framework, working with
|
|
* clocks that will often not be clones of what the PC-AT had.
|
|
* Use the command line to specify another RTC if you need one.
|
|
*/
|
|
static const char default_rtc[] = "/dev/rtc0";
|
|
|
|
static struct rtc_time cutoff_dates[] = {
|
|
{
|
|
.tm_year = 70, /* 1970 -1900 */
|
|
.tm_mday = 1,
|
|
},
|
|
/* signed time_t 19/01/2038 3:14:08 */
|
|
{
|
|
.tm_year = 138,
|
|
.tm_mday = 19,
|
|
},
|
|
{
|
|
.tm_year = 138,
|
|
.tm_mday = 20,
|
|
},
|
|
{
|
|
.tm_year = 199, /* 2099 -1900 */
|
|
.tm_mday = 1,
|
|
},
|
|
{
|
|
.tm_year = 200, /* 2100 -1900 */
|
|
.tm_mday = 1,
|
|
},
|
|
/* unsigned time_t 07/02/2106 7:28:15*/
|
|
{
|
|
.tm_year = 205,
|
|
.tm_mon = 1,
|
|
.tm_mday = 7,
|
|
},
|
|
{
|
|
.tm_year = 206,
|
|
.tm_mon = 1,
|
|
.tm_mday = 8,
|
|
},
|
|
/* signed time on 64bit in nanoseconds 12/04/2262 01:47:16*/
|
|
{
|
|
.tm_year = 362,
|
|
.tm_mon = 3,
|
|
.tm_mday = 12,
|
|
},
|
|
{
|
|
.tm_year = 362, /* 2262 -1900 */
|
|
.tm_mon = 3,
|
|
.tm_mday = 13,
|
|
},
|
|
};
|
|
|
|
static int compare_dates(struct rtc_time *a, struct rtc_time *b)
|
|
{
|
|
if (a->tm_year != b->tm_year ||
|
|
a->tm_mon != b->tm_mon ||
|
|
a->tm_mday != b->tm_mday ||
|
|
a->tm_hour != b->tm_hour ||
|
|
a->tm_min != b->tm_min ||
|
|
((b->tm_sec - a->tm_sec) > 1))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int i, fd, retval, irqcount = 0, dangerous = 0;
|
|
unsigned long tmp, data;
|
|
struct rtc_time rtc_tm;
|
|
const char *rtc = default_rtc;
|
|
struct timeval start, end, diff;
|
|
|
|
switch (argc) {
|
|
case 3:
|
|
if (*argv[2] == 'd')
|
|
dangerous = 1;
|
|
case 2:
|
|
rtc = argv[1];
|
|
/* FALLTHROUGH */
|
|
case 1:
|
|
break;
|
|
default:
|
|
fprintf(stderr, "usage: rtctest [rtcdev] [d]\n");
|
|
return 1;
|
|
}
|
|
|
|
fd = open(rtc, O_RDONLY);
|
|
|
|
if (fd == -1) {
|
|
perror(rtc);
|
|
exit(errno);
|
|
}
|
|
|
|
fprintf(stderr, "\n\t\t\tRTC Driver Test Example.\n\n");
|
|
|
|
/* Turn on update interrupts (one per second) */
|
|
retval = ioctl(fd, RTC_UIE_ON, 0);
|
|
if (retval == -1) {
|
|
if (errno == EINVAL) {
|
|
fprintf(stderr,
|
|
"\n...Update IRQs not supported.\n");
|
|
goto test_READ;
|
|
}
|
|
perror("RTC_UIE_ON ioctl");
|
|
exit(errno);
|
|
}
|
|
|
|
fprintf(stderr, "Counting 5 update (1/sec) interrupts from reading %s:",
|
|
rtc);
|
|
fflush(stderr);
|
|
for (i=1; i<6; i++) {
|
|
/* This read will block */
|
|
retval = read(fd, &data, sizeof(unsigned long));
|
|
if (retval == -1) {
|
|
perror("read");
|
|
exit(errno);
|
|
}
|
|
fprintf(stderr, " %d",i);
|
|
fflush(stderr);
|
|
irqcount++;
|
|
}
|
|
|
|
fprintf(stderr, "\nAgain, from using select(2) on /dev/rtc:");
|
|
fflush(stderr);
|
|
for (i=1; i<6; i++) {
|
|
struct timeval tv = {5, 0}; /* 5 second timeout on select */
|
|
fd_set readfds;
|
|
|
|
FD_ZERO(&readfds);
|
|
FD_SET(fd, &readfds);
|
|
/* The select will wait until an RTC interrupt happens. */
|
|
retval = select(fd+1, &readfds, NULL, NULL, &tv);
|
|
if (retval == -1) {
|
|
perror("select");
|
|
exit(errno);
|
|
}
|
|
/* This read won't block unlike the select-less case above. */
|
|
retval = read(fd, &data, sizeof(unsigned long));
|
|
if (retval == -1) {
|
|
perror("read");
|
|
exit(errno);
|
|
}
|
|
fprintf(stderr, " %d",i);
|
|
fflush(stderr);
|
|
irqcount++;
|
|
}
|
|
|
|
/* Turn off update interrupts */
|
|
retval = ioctl(fd, RTC_UIE_OFF, 0);
|
|
if (retval == -1) {
|
|
perror("RTC_UIE_OFF ioctl");
|
|
exit(errno);
|
|
}
|
|
|
|
test_READ:
|
|
/* Read the RTC time/date */
|
|
retval = ioctl(fd, RTC_RD_TIME, &rtc_tm);
|
|
if (retval == -1) {
|
|
perror("RTC_RD_TIME ioctl");
|
|
exit(errno);
|
|
}
|
|
|
|
fprintf(stderr, "\n\nCurrent RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
|
|
rtc_tm.tm_mday, rtc_tm.tm_mon + 1, rtc_tm.tm_year + 1900,
|
|
rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);
|
|
|
|
/* Set the alarm to 5 sec in the future, and check for rollover */
|
|
rtc_tm.tm_sec += 5;
|
|
if (rtc_tm.tm_sec >= 60) {
|
|
rtc_tm.tm_sec %= 60;
|
|
rtc_tm.tm_min++;
|
|
}
|
|
if (rtc_tm.tm_min == 60) {
|
|
rtc_tm.tm_min = 0;
|
|
rtc_tm.tm_hour++;
|
|
}
|
|
if (rtc_tm.tm_hour == 24)
|
|
rtc_tm.tm_hour = 0;
|
|
|
|
retval = ioctl(fd, RTC_ALM_SET, &rtc_tm);
|
|
if (retval == -1) {
|
|
if (errno == EINVAL) {
|
|
fprintf(stderr,
|
|
"\n...Alarm IRQs not supported.\n");
|
|
goto test_PIE;
|
|
}
|
|
|
|
perror("RTC_ALM_SET ioctl");
|
|
exit(errno);
|
|
}
|
|
|
|
/* Read the current alarm settings */
|
|
retval = ioctl(fd, RTC_ALM_READ, &rtc_tm);
|
|
if (retval == -1) {
|
|
if (errno == EINVAL) {
|
|
fprintf(stderr,
|
|
"\n...EINVAL reading current alarm setting.\n");
|
|
goto test_PIE;
|
|
}
|
|
perror("RTC_ALM_READ ioctl");
|
|
exit(errno);
|
|
}
|
|
|
|
fprintf(stderr, "Alarm time now set to %02d:%02d:%02d.\n",
|
|
rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);
|
|
|
|
/* Enable alarm interrupts */
|
|
retval = ioctl(fd, RTC_AIE_ON, 0);
|
|
if (retval == -1) {
|
|
if (errno == EINVAL || errno == EIO) {
|
|
fprintf(stderr,
|
|
"\n...Alarm IRQs not supported.\n");
|
|
goto test_PIE;
|
|
}
|
|
|
|
perror("RTC_AIE_ON ioctl");
|
|
exit(errno);
|
|
}
|
|
|
|
fprintf(stderr, "Waiting 5 seconds for alarm...");
|
|
fflush(stderr);
|
|
/* This blocks until the alarm ring causes an interrupt */
|
|
retval = read(fd, &data, sizeof(unsigned long));
|
|
if (retval == -1) {
|
|
perror("read");
|
|
exit(errno);
|
|
}
|
|
irqcount++;
|
|
fprintf(stderr, " okay. Alarm rang.\n");
|
|
|
|
/* Disable alarm interrupts */
|
|
retval = ioctl(fd, RTC_AIE_OFF, 0);
|
|
if (retval == -1) {
|
|
perror("RTC_AIE_OFF ioctl");
|
|
exit(errno);
|
|
}
|
|
|
|
test_PIE:
|
|
/* Read periodic IRQ rate */
|
|
retval = ioctl(fd, RTC_IRQP_READ, &tmp);
|
|
if (retval == -1) {
|
|
/* not all RTCs support periodic IRQs */
|
|
if (errno == EINVAL) {
|
|
fprintf(stderr, "\nNo periodic IRQ support\n");
|
|
goto test_DATE;
|
|
}
|
|
perror("RTC_IRQP_READ ioctl");
|
|
exit(errno);
|
|
}
|
|
fprintf(stderr, "\nPeriodic IRQ rate is %ldHz.\n", tmp);
|
|
|
|
fprintf(stderr, "Counting 20 interrupts at:");
|
|
fflush(stderr);
|
|
|
|
/* The frequencies 128Hz, 256Hz, ... 8192Hz are only allowed for root. */
|
|
for (tmp=2; tmp<=64; tmp*=2) {
|
|
|
|
retval = ioctl(fd, RTC_IRQP_SET, tmp);
|
|
if (retval == -1) {
|
|
/* not all RTCs can change their periodic IRQ rate */
|
|
if (errno == EINVAL) {
|
|
fprintf(stderr,
|
|
"\n...Periodic IRQ rate is fixed\n");
|
|
goto test_DATE;
|
|
}
|
|
perror("RTC_IRQP_SET ioctl");
|
|
exit(errno);
|
|
}
|
|
|
|
fprintf(stderr, "\n%ldHz:\t", tmp);
|
|
fflush(stderr);
|
|
|
|
/* Enable periodic interrupts */
|
|
retval = ioctl(fd, RTC_PIE_ON, 0);
|
|
if (retval == -1) {
|
|
perror("RTC_PIE_ON ioctl");
|
|
exit(errno);
|
|
}
|
|
|
|
for (i=1; i<21; i++) {
|
|
gettimeofday(&start, NULL);
|
|
/* This blocks */
|
|
retval = read(fd, &data, sizeof(unsigned long));
|
|
if (retval == -1) {
|
|
perror("read");
|
|
exit(errno);
|
|
}
|
|
gettimeofday(&end, NULL);
|
|
timersub(&end, &start, &diff);
|
|
if (diff.tv_sec > 0 ||
|
|
diff.tv_usec > ((1000000L / tmp) * 1.10)) {
|
|
fprintf(stderr, "\nPIE delta error: %ld.%06ld should be close to 0.%06ld\n",
|
|
diff.tv_sec, diff.tv_usec,
|
|
(1000000L / tmp));
|
|
fflush(stdout);
|
|
exit(-1);
|
|
}
|
|
|
|
fprintf(stderr, " %d",i);
|
|
fflush(stderr);
|
|
irqcount++;
|
|
}
|
|
|
|
/* Disable periodic interrupts */
|
|
retval = ioctl(fd, RTC_PIE_OFF, 0);
|
|
if (retval == -1) {
|
|
perror("RTC_PIE_OFF ioctl");
|
|
exit(errno);
|
|
}
|
|
}
|
|
|
|
test_DATE:
|
|
if (!dangerous)
|
|
goto done;
|
|
|
|
fprintf(stderr, "\nTesting problematic dates\n");
|
|
|
|
for (i = 0; i < ARRAY_SIZE(cutoff_dates); i++) {
|
|
struct rtc_time current;
|
|
|
|
/* Write the new date in RTC */
|
|
retval = ioctl(fd, RTC_SET_TIME, &cutoff_dates[i]);
|
|
if (retval == -1) {
|
|
perror("RTC_SET_TIME ioctl");
|
|
close(fd);
|
|
exit(errno);
|
|
}
|
|
|
|
/* Read back */
|
|
retval = ioctl(fd, RTC_RD_TIME, ¤t);
|
|
if (retval == -1) {
|
|
perror("RTC_RD_TIME ioctl");
|
|
exit(errno);
|
|
}
|
|
|
|
if(compare_dates(&cutoff_dates[i], ¤t)) {
|
|
fprintf(stderr,"Setting date %d failed\n",
|
|
cutoff_dates[i].tm_year + 1900);
|
|
goto done;
|
|
}
|
|
|
|
cutoff_dates[i].tm_sec += 5;
|
|
|
|
/* Write the new alarm in RTC */
|
|
retval = ioctl(fd, RTC_ALM_SET, &cutoff_dates[i]);
|
|
if (retval == -1) {
|
|
perror("RTC_ALM_SET ioctl");
|
|
close(fd);
|
|
exit(errno);
|
|
}
|
|
|
|
/* Read back */
|
|
retval = ioctl(fd, RTC_ALM_READ, ¤t);
|
|
if (retval == -1) {
|
|
perror("RTC_ALM_READ ioctl");
|
|
exit(errno);
|
|
}
|
|
|
|
if(compare_dates(&cutoff_dates[i], ¤t)) {
|
|
fprintf(stderr,"Setting alarm %d failed\n",
|
|
cutoff_dates[i].tm_year + 1900);
|
|
goto done;
|
|
}
|
|
|
|
fprintf(stderr, "Setting year %d is OK \n",
|
|
cutoff_dates[i].tm_year + 1900);
|
|
}
|
|
done:
|
|
fprintf(stderr, "\n\n\t\t\t *** Test complete ***\n");
|
|
|
|
close(fd);
|
|
|
|
return 0;
|
|
}
|
|
|