1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Real Time Clock Driver Test
3 *	by: Benjamin Gaignard (benjamin.gaignard@linaro.org)
4 *
5 * To build
6 *	gcc rtctest_setdate.c -o rtctest_setdate
7 */
8
9#include <stdio.h>
10#include <linux/rtc.h>
11#include <sys/ioctl.h>
12#include <sys/time.h>
13#include <sys/types.h>
14#include <fcntl.h>
15#include <unistd.h>
16#include <stdlib.h>
17#include <errno.h>
18
19static const char default_time[] = "00:00:00";
20
21int main(int argc, char **argv)
22{
23	int fd, retval;
24	struct rtc_time new, current;
25	const char *rtc, *date;
26	const char *time = default_time;
27
28	switch (argc) {
29	case 4:
30		time = argv[3];
31		/* FALLTHROUGH */
32	case 3:
33		date = argv[2];
34		rtc = argv[1];
35		break;
36	default:
37		fprintf(stderr, "usage: rtctest_setdate <rtcdev> <DD-MM-YYYY> [HH:MM:SS]\n");
38		return 1;
39	}
40
41	fd = open(rtc, O_RDONLY);
42	if (fd == -1) {
43		perror(rtc);
44		exit(errno);
45	}
46
47	sscanf(date, "%d-%d-%d", &new.tm_mday, &new.tm_mon, &new.tm_year);
48	new.tm_mon -= 1;
49	new.tm_year -= 1900;
50	sscanf(time, "%d:%d:%d", &new.tm_hour, &new.tm_min, &new.tm_sec);
51
52	fprintf(stderr, "Test will set RTC date/time to %d-%d-%d, %02d:%02d:%02d.\n",
53		new.tm_mday, new.tm_mon + 1, new.tm_year + 1900,
54		new.tm_hour, new.tm_min, new.tm_sec);
55
56	/* Write the new date in RTC */
57	retval = ioctl(fd, RTC_SET_TIME, &new);
58	if (retval == -1) {
59		perror("RTC_SET_TIME ioctl");
60		close(fd);
61		exit(errno);
62	}
63
64	/* Read back */
65	retval = ioctl(fd, RTC_RD_TIME, &current);
66	if (retval == -1) {
67		perror("RTC_RD_TIME ioctl");
68		exit(errno);
69	}
70
71	fprintf(stderr, "\n\nCurrent RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
72		current.tm_mday, current.tm_mon + 1, current.tm_year + 1900,
73		current.tm_hour, current.tm_min, current.tm_sec);
74
75	close(fd);
76	return 0;
77}
78