// SPDX-License-Identifier: GPL-2.0-or-later
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/* Real Time Clock Driver Test
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* by: Benjamin Gaignard (benjamin.gaignard@linaro.org)
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*
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* To build
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* gcc rtctest_setdate.c -o rtctest_setdate
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*/
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#include <stdio.h>
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#include <linux/rtc.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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static const char default_time[] = "00:00:00";
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int main(int argc, char **argv)
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{
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int fd, retval;
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struct rtc_time new, current;
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const char *rtc, *date;
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const char *time = default_time;
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switch (argc) {
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case 4:
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time = argv[3];
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/* FALLTHROUGH */
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case 3:
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date = argv[2];
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rtc = argv[1];
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break;
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default:
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fprintf(stderr, "usage: rtctest_setdate <rtcdev> <DD-MM-YYYY> [HH:MM:SS]\n");
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return 1;
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}
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fd = open(rtc, O_RDONLY);
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if (fd == -1) {
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perror(rtc);
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exit(errno);
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}
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sscanf(date, "%d-%d-%d", &new.tm_mday, &new.tm_mon, &new.tm_year);
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new.tm_mon -= 1;
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new.tm_year -= 1900;
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sscanf(time, "%d:%d:%d", &new.tm_hour, &new.tm_min, &new.tm_sec);
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fprintf(stderr, "Test will set RTC date/time to %d-%d-%d, %02d:%02d:%02d.\n",
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new.tm_mday, new.tm_mon + 1, new.tm_year + 1900,
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new.tm_hour, new.tm_min, new.tm_sec);
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/* Write the new date in RTC */
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retval = ioctl(fd, RTC_SET_TIME, &new);
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if (retval == -1) {
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perror("RTC_SET_TIME ioctl");
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close(fd);
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exit(errno);
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}
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/* Read back */
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retval = ioctl(fd, RTC_RD_TIME, ¤t);
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if (retval == -1) {
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perror("RTC_RD_TIME ioctl");
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exit(errno);
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}
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fprintf(stderr, "\n\nCurrent RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
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current.tm_mday, current.tm_mon + 1, current.tm_year + 1900,
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current.tm_hour, current.tm_min, current.tm_sec);
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close(fd);
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return 0;
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}
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