tools/testing/selftests/rtc/setdate.c

   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
  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, &current);
  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 }