diff options
Diffstat (limited to 'drivers/rtc/rtc-lib.c')
-rw-r--r-- | drivers/rtc/rtc-lib.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c index cfedc1d28ee1..9812120f3a7c 100644 --- a/drivers/rtc/rtc-lib.c +++ b/drivers/rtc/rtc-lib.c | |||
@@ -18,9 +18,19 @@ static const unsigned char rtc_days_in_month[] = { | |||
18 | 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 | 18 | 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 |
19 | }; | 19 | }; |
20 | 20 | ||
21 | static const unsigned short rtc_ydays[2][13] = { | ||
22 | /* Normal years */ | ||
23 | { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, | ||
24 | /* Leap years */ | ||
25 | { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } | ||
26 | }; | ||
27 | |||
21 | #define LEAPS_THRU_END_OF(y) ((y)/4 - (y)/100 + (y)/400) | 28 | #define LEAPS_THRU_END_OF(y) ((y)/4 - (y)/100 + (y)/400) |
22 | #define LEAP_YEAR(year) ((!(year % 4) && (year % 100)) || !(year % 400)) | 29 | #define LEAP_YEAR(year) ((!(year % 4) && (year % 100)) || !(year % 400)) |
23 | 30 | ||
31 | /* | ||
32 | * The number of days in the month. | ||
33 | */ | ||
24 | int rtc_month_days(unsigned int month, unsigned int year) | 34 | int rtc_month_days(unsigned int month, unsigned int year) |
25 | { | 35 | { |
26 | return rtc_days_in_month[month] + (LEAP_YEAR(year) && month == 1); | 36 | return rtc_days_in_month[month] + (LEAP_YEAR(year) && month == 1); |
@@ -28,6 +38,15 @@ int rtc_month_days(unsigned int month, unsigned int year) | |||
28 | EXPORT_SYMBOL(rtc_month_days); | 38 | EXPORT_SYMBOL(rtc_month_days); |
29 | 39 | ||
30 | /* | 40 | /* |
41 | * The number of days since January 1. (0 to 365) | ||
42 | */ | ||
43 | int rtc_year_days(unsigned int day, unsigned int month, unsigned int year) | ||
44 | { | ||
45 | return rtc_ydays[LEAP_YEAR(year)][month] + day-1; | ||
46 | } | ||
47 | EXPORT_SYMBOL(rtc_year_days); | ||
48 | |||
49 | /* | ||
31 | * Convert seconds since 01-01-1970 00:00:00 to Gregorian date. | 50 | * Convert seconds since 01-01-1970 00:00:00 to Gregorian date. |
32 | */ | 51 | */ |
33 | void rtc_time_to_tm(unsigned long time, struct rtc_time *tm) | 52 | void rtc_time_to_tm(unsigned long time, struct rtc_time *tm) |