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 | |
19 | static const char default_time[] = "00:00:00" ; |
20 | |
21 | int 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, ¤t); |
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 | |