1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /* Real Time Clock Driver Test
3*4882a593Smuzhiyun * by: Benjamin Gaignard (benjamin.gaignard@linaro.org)
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * To build
6*4882a593Smuzhiyun * gcc rtctest_setdate.c -o rtctest_setdate
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <stdio.h>
10*4882a593Smuzhiyun #include <linux/rtc.h>
11*4882a593Smuzhiyun #include <sys/ioctl.h>
12*4882a593Smuzhiyun #include <sys/time.h>
13*4882a593Smuzhiyun #include <sys/types.h>
14*4882a593Smuzhiyun #include <fcntl.h>
15*4882a593Smuzhiyun #include <unistd.h>
16*4882a593Smuzhiyun #include <stdlib.h>
17*4882a593Smuzhiyun #include <errno.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun static const char default_time[] = "00:00:00";
20*4882a593Smuzhiyun
main(int argc,char ** argv)21*4882a593Smuzhiyun int main(int argc, char **argv)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun int fd, retval;
24*4882a593Smuzhiyun struct rtc_time new, current;
25*4882a593Smuzhiyun const char *rtc, *date;
26*4882a593Smuzhiyun const char *time = default_time;
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun switch (argc) {
29*4882a593Smuzhiyun case 4:
30*4882a593Smuzhiyun time = argv[3];
31*4882a593Smuzhiyun /* FALLTHROUGH */
32*4882a593Smuzhiyun case 3:
33*4882a593Smuzhiyun date = argv[2];
34*4882a593Smuzhiyun rtc = argv[1];
35*4882a593Smuzhiyun break;
36*4882a593Smuzhiyun default:
37*4882a593Smuzhiyun fprintf(stderr, "usage: rtctest_setdate <rtcdev> <DD-MM-YYYY> [HH:MM:SS]\n");
38*4882a593Smuzhiyun return 1;
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun fd = open(rtc, O_RDONLY);
42*4882a593Smuzhiyun if (fd == -1) {
43*4882a593Smuzhiyun perror(rtc);
44*4882a593Smuzhiyun exit(errno);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun sscanf(date, "%d-%d-%d", &new.tm_mday, &new.tm_mon, &new.tm_year);
48*4882a593Smuzhiyun new.tm_mon -= 1;
49*4882a593Smuzhiyun new.tm_year -= 1900;
50*4882a593Smuzhiyun sscanf(time, "%d:%d:%d", &new.tm_hour, &new.tm_min, &new.tm_sec);
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun fprintf(stderr, "Test will set RTC date/time to %d-%d-%d, %02d:%02d:%02d.\n",
53*4882a593Smuzhiyun new.tm_mday, new.tm_mon + 1, new.tm_year + 1900,
54*4882a593Smuzhiyun new.tm_hour, new.tm_min, new.tm_sec);
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun /* Write the new date in RTC */
57*4882a593Smuzhiyun retval = ioctl(fd, RTC_SET_TIME, &new);
58*4882a593Smuzhiyun if (retval == -1) {
59*4882a593Smuzhiyun perror("RTC_SET_TIME ioctl");
60*4882a593Smuzhiyun close(fd);
61*4882a593Smuzhiyun exit(errno);
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun /* Read back */
65*4882a593Smuzhiyun retval = ioctl(fd, RTC_RD_TIME, ¤t);
66*4882a593Smuzhiyun if (retval == -1) {
67*4882a593Smuzhiyun perror("RTC_RD_TIME ioctl");
68*4882a593Smuzhiyun exit(errno);
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun fprintf(stderr, "\n\nCurrent RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
72*4882a593Smuzhiyun current.tm_mday, current.tm_mon + 1, current.tm_year + 1900,
73*4882a593Smuzhiyun current.tm_hour, current.tm_min, current.tm_sec);
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun close(fd);
76*4882a593Smuzhiyun return 0;
77*4882a593Smuzhiyun }
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