11d1bb12aSCassio Neri // SPDX-License-Identifier: LGPL-2.1+
21d1bb12aSCassio Neri
31d1bb12aSCassio Neri #include <kunit/test.h>
41d1bb12aSCassio Neri #include <linux/rtc.h>
51d1bb12aSCassio Neri
61d1bb12aSCassio Neri /*
71d1bb12aSCassio Neri * Advance a date by one day.
81d1bb12aSCassio Neri */
advance_date(int * year,int * month,int * mday,int * yday)91d1bb12aSCassio Neri static void advance_date(int *year, int *month, int *mday, int *yday)
101d1bb12aSCassio Neri {
111d1bb12aSCassio Neri if (*mday != rtc_month_days(*month - 1, *year)) {
121d1bb12aSCassio Neri ++*mday;
131d1bb12aSCassio Neri ++*yday;
141d1bb12aSCassio Neri return;
151d1bb12aSCassio Neri }
161d1bb12aSCassio Neri
171d1bb12aSCassio Neri *mday = 1;
181d1bb12aSCassio Neri if (*month != 12) {
191d1bb12aSCassio Neri ++*month;
201d1bb12aSCassio Neri ++*yday;
211d1bb12aSCassio Neri return;
221d1bb12aSCassio Neri }
231d1bb12aSCassio Neri
241d1bb12aSCassio Neri *month = 1;
251d1bb12aSCassio Neri *yday = 1;
261d1bb12aSCassio Neri ++*year;
271d1bb12aSCassio Neri }
281d1bb12aSCassio Neri
291d1bb12aSCassio Neri /*
301d1bb12aSCassio Neri * Checks every day in a 160000 years interval starting on 1970-01-01
311d1bb12aSCassio Neri * against the expected result.
321d1bb12aSCassio Neri */
rtc_time64_to_tm_test_date_range(struct kunit * test)331d1bb12aSCassio Neri static void rtc_time64_to_tm_test_date_range(struct kunit *test)
341d1bb12aSCassio Neri {
351d1bb12aSCassio Neri /*
361d1bb12aSCassio Neri * 160000 years = (160000 / 400) * 400 years
371d1bb12aSCassio Neri * = (160000 / 400) * 146097 days
381d1bb12aSCassio Neri * = (160000 / 400) * 146097 * 86400 seconds
391d1bb12aSCassio Neri */
401d1bb12aSCassio Neri time64_t total_secs = ((time64_t) 160000) / 400 * 146097 * 86400;
411d1bb12aSCassio Neri
421d1bb12aSCassio Neri int year = 1970;
431d1bb12aSCassio Neri int month = 1;
441d1bb12aSCassio Neri int mday = 1;
451d1bb12aSCassio Neri int yday = 1;
461d1bb12aSCassio Neri
471d1bb12aSCassio Neri struct rtc_time result;
481d1bb12aSCassio Neri time64_t secs;
491d1bb12aSCassio Neri s64 days;
501d1bb12aSCassio Neri
511d1bb12aSCassio Neri for (secs = 0; secs <= total_secs; secs += 86400) {
521d1bb12aSCassio Neri
531d1bb12aSCassio Neri rtc_time64_to_tm(secs, &result);
541d1bb12aSCassio Neri
551d1bb12aSCassio Neri days = div_s64(secs, 86400);
561d1bb12aSCassio Neri
57*01df80b3SDavid Gow #define FAIL_MSG "%d/%02d/%02d (%2d) : %lld", \
581d1bb12aSCassio Neri year, month, mday, yday, days
591d1bb12aSCassio Neri
601d1bb12aSCassio Neri KUNIT_ASSERT_EQ_MSG(test, year - 1900, result.tm_year, FAIL_MSG);
611d1bb12aSCassio Neri KUNIT_ASSERT_EQ_MSG(test, month - 1, result.tm_mon, FAIL_MSG);
621d1bb12aSCassio Neri KUNIT_ASSERT_EQ_MSG(test, mday, result.tm_mday, FAIL_MSG);
631d1bb12aSCassio Neri KUNIT_ASSERT_EQ_MSG(test, yday, result.tm_yday, FAIL_MSG);
641d1bb12aSCassio Neri
651d1bb12aSCassio Neri advance_date(&year, &month, &mday, &yday);
661d1bb12aSCassio Neri }
671d1bb12aSCassio Neri }
681d1bb12aSCassio Neri
691d1bb12aSCassio Neri static struct kunit_case rtc_lib_test_cases[] = {
701d1bb12aSCassio Neri KUNIT_CASE(rtc_time64_to_tm_test_date_range),
711d1bb12aSCassio Neri {}
721d1bb12aSCassio Neri };
731d1bb12aSCassio Neri
741d1bb12aSCassio Neri static struct kunit_suite rtc_lib_test_suite = {
751d1bb12aSCassio Neri .name = "rtc_lib_test_cases",
761d1bb12aSCassio Neri .test_cases = rtc_lib_test_cases,
771d1bb12aSCassio Neri };
781d1bb12aSCassio Neri
791d1bb12aSCassio Neri kunit_test_suite(rtc_lib_test_suite);
805546e3dfSAlexandre Belloni
815546e3dfSAlexandre Belloni MODULE_LICENSE("GPL");
82