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1// SPDX-License-Identifier: LGPL-2.1+2 3#include <kunit/test.h>4#include <linux/rtc.h>5 6/*7 * Advance a date by one day.8 */9static void advance_date(int *year, int *month, int *mday, int *yday)10{11 if (*mday != rtc_month_days(*month - 1, *year)) {12 ++*mday;13 ++*yday;14 return;15 }16 17 *mday = 1;18 if (*month != 12) {19 ++*month;20 ++*yday;21 return;22 }23 24 *month = 1;25 *yday = 1;26 ++*year;27}28 29/*30 * Check every day in specified number of years interval starting on 1970-01-0131 * against the expected result.32 */33static void rtc_time64_to_tm_test_date_range(struct kunit *test, int years)34{35 /*36 * years = (years / 400) * 400 years37 * = (years / 400) * 146097 days38 * = (years / 400) * 146097 * 86400 seconds39 */40 time64_t total_secs = ((time64_t)years) / 400 * 146097 * 86400;41 42 int year = 1970;43 int month = 1;44 int mday = 1;45 int yday = 1;46 47 struct rtc_time result;48 time64_t secs;49 s64 days;50 51 for (secs = 0; secs <= total_secs; secs += 86400) {52 53 rtc_time64_to_tm(secs, &result);54 55 days = div_s64(secs, 86400);56 57 #define FAIL_MSG "%d/%02d/%02d (%2d) : %lld", \58 year, month, mday, yday, days59 60 KUNIT_ASSERT_EQ_MSG(test, year - 1900, result.tm_year, FAIL_MSG);61 KUNIT_ASSERT_EQ_MSG(test, month - 1, result.tm_mon, FAIL_MSG);62 KUNIT_ASSERT_EQ_MSG(test, mday, result.tm_mday, FAIL_MSG);63 KUNIT_ASSERT_EQ_MSG(test, yday, result.tm_yday, FAIL_MSG);64 65 advance_date(&year, &month, &mday, &yday);66 }67}68 69/*70 * Checks every day in a 160000 years interval starting on 1970-01-0171 * against the expected result.72 */73static void rtc_time64_to_tm_test_date_range_160000(struct kunit *test)74{75 rtc_time64_to_tm_test_date_range(test, 160000);76}77 78/*79 * Checks every day in a 1000 years interval starting on 1970-01-0180 * against the expected result.81 */82static void rtc_time64_to_tm_test_date_range_1000(struct kunit *test)83{84 rtc_time64_to_tm_test_date_range(test, 1000);85}86 87static struct kunit_case rtc_lib_test_cases[] = {88 KUNIT_CASE(rtc_time64_to_tm_test_date_range_1000),89 KUNIT_CASE_SLOW(rtc_time64_to_tm_test_date_range_160000),90 {}91};92 93static struct kunit_suite rtc_lib_test_suite = {94 .name = "rtc_lib_test_cases",95 .test_cases = rtc_lib_test_cases,96};97 98kunit_test_suite(rtc_lib_test_suite);99 100MODULE_DESCRIPTION("KUnit test for RTC lib functions");101MODULE_LICENSE("GPL");102