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authorAndrew Victor <andrew@sanpeople.com>2006-06-25 08:48:25 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 13:01:14 -0400
commit8232212e0b4ee4eb3e407f5a9b098f6377820164 (patch)
tree427b2c0a935e880d0a949f22072af207ade1e793 /drivers/rtc
parent362600fe60fd18a25b4de8ec544b9e24e77e1484 (diff)
[PATCH] RTC: Add rtc_year_days() to calculate tm_yday
RTC: Add exported function rtc_year_days() to calculate the tm_yday value. Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Alessandro Zummo <a.zummo@towertech.it> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-lib.c19
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
21static 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 */
24int rtc_month_days(unsigned int month, unsigned int year) 34int 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)
28EXPORT_SYMBOL(rtc_month_days); 38EXPORT_SYMBOL(rtc_month_days);
29 39
30/* 40/*
41 * The number of days since January 1. (0 to 365)
42 */
43int rtc_year_days(unsigned int day, unsigned int month, unsigned int year)
44{
45 return rtc_ydays[LEAP_YEAR(year)][month] + day-1;
46}
47EXPORT_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 */
33void rtc_time_to_tm(unsigned long time, struct rtc_time *tm) 52void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)