1 files changed, 77 insertions, 0 deletions
diff --git a/tools/testing/selftests/rtc/setdate.c b/tools/testing/selftests/rtc/setdate.c
new file mode 100644
index 0000000000..b303890b3d
--- /dev/null
+++ b/tools/testing/selftests/rtc/setdate.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Real Time Clock Driver Test
+ *	by: Benjamin Gaignard (benjamin.gaignard@linaro.org)
+ *
+ * To build
+ *	gcc rtctest_setdate.c -o rtctest_setdate
+ */
+
+#include <stdio.h>
+#include <linux/rtc.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+
+static const char default_time[] = "00:00:00";
+
+int main(int argc, char **argv)
+{
+	int fd, retval;
+	struct rtc_time new, current;
+	const char *rtc, *date;
+	const char *time = default_time;
+
+	switch (argc) {
+	case 4:
+		time = argv[3];
+		/* FALLTHROUGH */
+	case 3:
+		date = argv[2];
+		rtc = argv[1];
+		break;
+	default:
+		fprintf(stderr, "usage: rtctest_setdate <rtcdev> <DD-MM-YYYY> [HH:MM:SS]\n");
+		return 1;
+	}
+
+	fd = open(rtc, O_RDONLY);
+	if (fd == -1) {
+		perror(rtc);
+		exit(errno);
+	}
+
+	sscanf(date, "%d-%d-%d", &new.tm_mday, &new.tm_mon, &new.tm_year);
+	new.tm_mon -= 1;
+	new.tm_year -= 1900;
+	sscanf(time, "%d:%d:%d", &new.tm_hour, &new.tm_min, &new.tm_sec);
+
+	fprintf(stderr, "Test will set RTC date/time to %d-%d-%d, %02d:%02d:%02d.\n",
+		new.tm_mday, new.tm_mon + 1, new.tm_year + 1900,
+		new.tm_hour, new.tm_min, new.tm_sec);
+
+	/* Write the new date in RTC */
+	retval = ioctl(fd, RTC_SET_TIME, &new);
+	if (retval == -1) {
+		perror("RTC_SET_TIME ioctl");
+		close(fd);
+		exit(errno);
+	}
+
+	/* Read back */
+	retval = ioctl(fd, RTC_RD_TIME, &current);
+	if (retval == -1) {
+		perror("RTC_RD_TIME ioctl");
+		exit(errno);
+	}
+
+	fprintf(stderr, "\n\nCurrent RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
+		current.tm_mday, current.tm_mon + 1, current.tm_year + 1900,
+		current.tm_hour, current.tm_min, current.tm_sec);
+
+	close(fd);
+	return 0;
+}