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 */
advance_date(int * year,int * month,int * mday,int * yday,int * wday)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 */
rtc_time64_to_tm_test_date_range(struct kunit * test,int years)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 */
rtc_time64_to_tm_test_date_range_160000(struct kunit * test)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 */
rtc_time64_to_tm_test_date_range_1000(struct kunit * test)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