tools/testing/selftests/rtc/setdate.c

   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, &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 }