1 /* Real Time Clock Driver Test
2 * by: Benjamin Gaignard (benjamin.gaignard@linaro.org)
3 *
4 * To build
5 * gcc rtctest_setdate.c -o rtctest_setdate
6 *
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18 #include <stdio.h>
19 #include <linux/rtc.h>
20 #include <sys/ioctl.h>
21 #include <sys/time.h>
22 #include <sys/types.h>
23 #include <fcntl.h>
24 #include <unistd.h>
25 #include <stdlib.h>
26 #include <errno.h>
27
28 static const char default_time[] = "00:00:00";
29
main(int argc,char ** argv)30 int main(int argc, char **argv)
31 {
32 int fd, retval;
33 struct rtc_time new, current;
34 const char *rtc, *date;
35 const char *time = default_time;
36
37 switch (argc) {
38 case 4:
39 time = argv[3];
40 /* FALLTHROUGH */
41 case 3:
42 date = argv[2];
43 rtc = argv[1];
44 break;
45 default:
46 fprintf(stderr, "usage: rtctest_setdate <rtcdev> <DD-MM-YYYY> [HH:MM:SS]\n");
47 return 1;
48 }
49
50 fd = open(rtc, O_RDONLY);
51 if (fd == -1) {
52 perror(rtc);
53 exit(errno);
54 }
55
56 sscanf(date, "%d-%d-%d", &new.tm_mday, &new.tm_mon, &new.tm_year);
57 new.tm_mon -= 1;
58 new.tm_year -= 1900;
59 sscanf(time, "%d:%d:%d", &new.tm_hour, &new.tm_min, &new.tm_sec);
60
61 fprintf(stderr, "Test will set RTC date/time to %d-%d-%d, %02d:%02d:%02d.\n",
62 new.tm_mday, new.tm_mon + 1, new.tm_year + 1900,
63 new.tm_hour, new.tm_min, new.tm_sec);
64
65 /* Write the new date in RTC */
66 retval = ioctl(fd, RTC_SET_TIME, &new);
67 if (retval == -1) {
68 perror("RTC_SET_TIME ioctl");
69 close(fd);
70 exit(errno);
71 }
72
73 /* Read back */
74 retval = ioctl(fd, RTC_RD_TIME, ¤t);
75 if (retval == -1) {
76 perror("RTC_RD_TIME ioctl");
77 exit(errno);
78 }
79
80 fprintf(stderr, "\n\nCurrent RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
81 current.tm_mday, current.tm_mon + 1, current.tm_year + 1900,
82 current.tm_hour, current.tm_min, current.tm_sec);
83
84 close(fd);
85 return 0;
86 }
87