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 */ 9 static void advance_date(int *year, int *month, int *mday, int *yday, int *wday) 10 { 11 *wday = (*wday + 1) % 7; 12 13 if (*mday != rtc_month_days(*month - 1, *year)) { 14 ++*mday; 15 ++*yday; 16 return; 17 } 18 19 *mday = 1; 20 if (*month != 12) { 21 ++*month; 22 ++*yday; 23 return; 24 } 25 26 *month = 1; 27 *yday = 1; 28 ++*year; 29 } 30 31 /* 32 * Check every day in specified number of years interval starting on 1970-01-01 33 * against the expected result. 34 */ 35 static void rtc_time64_to_tm_test_date_range(struct kunit *test, int years) 36 { 37 /* 38 * years = (years / 400) * 400 years 39 * = (years / 400) * 146097 days 40 * = (years / 400) * 146097 * 86400 seconds 41 */ 42 time64_t total_secs = ((time64_t)years) / 400 * 146097 * 86400; 43 44 int year = 1900; 45 int month = 1; 46 int mday = 1; 47 int yday = 1; 48 int wday = 1; /* Jan 1st 1900 was a Monday */ 49 50 struct rtc_time result; 51 time64_t secs; 52 const time64_t sec_offset = RTC_TIMESTAMP_BEGIN_1900 + ((1 * 60) + 2) * 60 + 3; 53 54 for (secs = 0; secs <= total_secs; secs += 86400) { 55 56 rtc_time64_to_tm(secs + sec_offset, &result); 57 58 #define FAIL_MSG "%d/%02d/%02d (%2d, %d) : %lld", \ 59 year, month, mday, yday, wday, secs + sec_offset 60 61 KUNIT_ASSERT_EQ_MSG(test, year - 1900, result.tm_year, FAIL_MSG); 62 KUNIT_ASSERT_EQ_MSG(test, month - 1, result.tm_mon, FAIL_MSG); 63 KUNIT_ASSERT_EQ_MSG(test, mday, result.tm_mday, FAIL_MSG); 64 KUNIT_ASSERT_EQ_MSG(test, yday, result.tm_yday, FAIL_MSG); 65 KUNIT_ASSERT_EQ_MSG(test, 1, result.tm_hour, FAIL_MSG); 66 KUNIT_ASSERT_EQ_MSG(test, 2, result.tm_min, FAIL_MSG); 67 KUNIT_ASSERT_EQ_MSG(test, 3, result.tm_sec, FAIL_MSG); 68 KUNIT_ASSERT_EQ_MSG(test, wday, result.tm_wday, FAIL_MSG); 69 70 advance_date(&year, &month, &mday, &yday, &wday); 71 } 72 } 73 74 /* 75 * Checks every day in a 160000 years interval starting on 1900-01-01 76 * against the expected result. 77 */ 78 static void rtc_time64_to_tm_test_date_range_160000(struct kunit *test) 79 { 80 rtc_time64_to_tm_test_date_range(test, 160000); 81 } 82 83 /* 84 * Checks every day in a 1000 years interval starting on 1900-01-01 85 * against the expected result. 86 */ 87 static void rtc_time64_to_tm_test_date_range_1000(struct kunit *test) 88 { 89 rtc_time64_to_tm_test_date_range(test, 1000); 90 } 91 92 static struct kunit_case rtc_lib_test_cases[] = { 93 KUNIT_CASE(rtc_time64_to_tm_test_date_range_1000), 94 KUNIT_CASE_SLOW(rtc_time64_to_tm_test_date_range_160000), 95 {} 96 }; 97 98 static struct kunit_suite rtc_lib_test_suite = { 99 .name = "rtc_lib_test_cases", 100 .test_cases = rtc_lib_test_cases, 101 }; 102 103 kunit_test_suite(rtc_lib_test_suite); 104 105 MODULE_DESCRIPTION("KUnit test for RTC lib functions"); 106 MODULE_LICENSE("GPL"); 107