1 /* Real Time Clock Driver Test 2 * by: Benjamin Gaignard (benjamin.gaignard (at) 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, ¤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
