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// SPDX-License-Identifier: GPL-2.0
/*
* Real Time Clock Driver range test
*
* Copyright (c) 2018 Alexandre Belloni <alexandre.belloni@bootlin.com>
*/
#include <errno.h>
#include <fcntl.h>
#include <linux/rtc.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
static char *rtc_file = "/dev/rtc0";
#define IOCTL(f, r, d, rc) rc = ioctl(f, r, d); \
if (rc) { \
fprintf(stderr, "KO %s returned %d (line %d)\n", #r, errno, __LINE__); \
continue; \
}
#define ISODATEFMT "%04d-%02d-%02d %02d:%02d:%02d"
#define ISODATE(tm) tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, \
tm.tm_hour, tm.tm_min, tm.tm_sec
#ifndef ARRAY_SIZE
# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#endif
static struct {
struct rtc_time tm;
struct rtc_time expected;
} dates [] = {
{ /* UNIX epoch */
.tm = { .tm_year = 70, .tm_mon = 0, .tm_mday = 1,
.tm_hour = 0, .tm_min = 0, .tm_sec = 0 },
.expected = { .tm_year = 70, .tm_mon = 0, .tm_mday = 1,
.tm_hour = 0, .tm_min = 0, .tm_sec = 1 }
},
{ /* 2000 is a leap year */
.tm = { .tm_year = 100, .tm_mon = 1, .tm_mday = 28,
.tm_hour = 23, .tm_min = 59, .tm_sec = 59 },
.expected = { .tm_year = 100, .tm_mon = 1, .tm_mday = 29,
.tm_hour = 0, .tm_min = 0, .tm_sec = 0 }
},
{ /* 2020 is a leap year */
.tm = { .tm_year = 120, .tm_mon = 1, .tm_mday = 28,
.tm_hour = 23, .tm_min = 59, .tm_sec = 59 },
.expected = { .tm_year = 120, .tm_mon = 1, .tm_mday = 29,
.tm_hour = 0, .tm_min = 0, .tm_sec = 0 }
},
{ /* signed 32bit time_t overflow */
.tm = { .tm_year = 138, .tm_mday = 19,
.tm_hour = 3, .tm_min = 14, .tm_sec = 7 },
.expected = { .tm_year = 138, .tm_mday = 19,
.tm_hour = 3, .tm_min = 14, .tm_sec = 8 }
},
{ /* 2069 to 2070 */
.tm = { .tm_year = 169, .tm_mon = 11, .tm_mday = 31,
.tm_hour = 23, .tm_min = 59, .tm_sec = 59 },
.expected = { .tm_year = 170, .tm_mday = 1,
.tm_hour = 0, .tm_min = 0, .tm_sec = 0 }
},
{ /* 2079 to 2080 */
.tm = { .tm_year = 179, .tm_mon = 11, .tm_mday = 31,
.tm_hour = 23, .tm_min = 59, .tm_sec = 59 },
.expected = { .tm_year = 180, .tm_mday = 1,
.tm_hour = 0, .tm_min = 0, .tm_sec = 0 }
},
{ /* 2099 to 2100 */
.tm = { .tm_year = 199, .tm_mon = 11, .tm_mday = 31,
.tm_hour = 23, .tm_min = 59, .tm_sec = 59 },
.expected = { .tm_year = 200, .tm_mday = 1,
.tm_hour = 0, .tm_min = 0, .tm_sec = 0 }
},
{ /* 2100 is not a leap year */
.tm = { .tm_year = 200, .tm_mon = 1, .tm_mday = 28,
.tm_hour = 23, .tm_min = 59, .tm_sec = 59 },
.expected = { .tm_year = 200, .tm_mon = 2, .tm_mday = 1,
.tm_hour = 0, .tm_min = 0, .tm_sec = 0 }
},
{ /* unsigned 32bit time_t overflow */
.tm = { .tm_year = 206, .tm_mon = 1, .tm_mday = 7,
.tm_hour = 6, .tm_min = 28, .tm_sec = 15 },
.expected = { .tm_year = 206, .tm_mon = 1, .tm_mday = 7,
.tm_hour = 6, .tm_min = 28, .tm_sec = 16 }
},
{ /* ktime_t overflow */
.tm = { .tm_year = 362, .tm_mon = 3, .tm_mday = 11,
.tm_hour = 23, .tm_min = 47, .tm_sec = 16 },
.expected = { .tm_year = 362, .tm_mon = 3, .tm_mday = 11,
.tm_hour = 23, .tm_min = 47, .tm_sec = 17 }
},
};
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 ||
a->tm_sec != b->tm_sec)
return 1;
return 0;
}
int main(int argc, char **argv)
{
int fd, i, rc;
switch (argc) {
case 2:
rtc_file = argv[1];
/* FALLTHROUGH */
case 1:
break;
default:
fprintf(stderr, "usage: %s [rtcdev]\n", argv[0]);
return 1;
}
fd = open(rtc_file, O_RDONLY);
if (fd == -1) {
perror(rtc_file);
exit(errno);
}
for (i = 0; i < ARRAY_SIZE(dates); i++) {
struct rtc_time tm;
printf("\nTesting " ISODATEFMT ".\n", ISODATE(dates[i].tm));
IOCTL(fd, RTC_SET_TIME, &dates[i].tm, rc);
IOCTL(fd, RTC_RD_TIME, &tm, rc);
rc = compare_dates(&dates[i].tm, &tm);
if (rc) {
printf("KO Read back " ISODATEFMT ".\n", ISODATE(tm));
continue;
}
/*
* We can't rely on alarms to work and because update interrupts
* are implemented using alarms, they are not usable either
*/
sleep(1);
IOCTL(fd, RTC_RD_TIME, &tm, rc);
rc = compare_dates(&dates[i].expected, &tm);
if (rc) {
printf("KO Expected " ISODATEFMT ".\n",
ISODATE(dates[i].expected));
printf(" Got " ISODATEFMT ".\n", ISODATE(tm));
continue;
}
printf("OK\n");
continue;
/*
* Test alarms note: this will always fail the ktime_t overflow
* because it is stored internally in a ktime_t
*/
IOCTL(fd, RTC_SET_TIME, &dates[i].tm, rc);
IOCTL(fd, RTC_WKALM_SET, &dates[i].tm, rc);
IOCTL(fd, RTC_WKALM_RD, &dates[i].tm, rc);
rc = compare_dates(&dates[i].tm, &tm);
if (rc) {
printf("KO ALM Read back " ISODATEFMT ".\n",
ISODATE(tm));
continue;
}
}
close(fd);
}
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