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rtc-lib: import rtc_time_to_tm() from linux-3.15 

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Antony Pavlov 2014-07-30 00:10:22 +04:00 committed by Sascha Hauer
parent e1af262100
commit 287e085fa9
2 changed files with 46 additions and 0 deletions
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45
drivers/rtc/rtc-lib.c
View File

@ -38,6 +38,51 @@ int rtc_month_days(unsigned int month, unsigned int year)
}
EXPORT_SYMBOL(rtc_month_days);
/*
* Convert seconds since 01-01-1970 00:00:00 to Gregorian date.
*/
void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
{
unsigned int month, year;
int days;
days = time / 86400;
time -= (unsigned int) days * 86400;
/* day of the week, 1970-01-01 was a Thursday */
tm->tm_wday = (days + 4) % 7;
year = 1970 + days / 365;
days -= (year - 1970) * 365
+ LEAPS_THRU_END_OF(year - 1)
- LEAPS_THRU_END_OF(1970 - 1);
if (days < 0) {
year -= 1;
days += 365 + is_leap_year(year);
}
tm->tm_year = year - 1900;
tm->tm_yday = days + 1;
for (month = 0; month < 11; month++) {
int newdays;
newdays = days - rtc_month_days(month, year);
if (newdays < 0)
break;
days = newdays;
}
tm->tm_mon = month;
tm->tm_mday = days + 1;
tm->tm_hour = time / 3600;
time -= tm->tm_hour * 3600;
tm->tm_min = time / 60;
tm->tm_sec = time - tm->tm_min * 60;
tm->tm_isdst = 0;
}
EXPORT_SYMBOL(rtc_time_to_tm);
/*
* Does the rtc_time represent a valid date/time?
*/

1
include/linux/rtc.h
View File

@ -17,6 +17,7 @@
extern int rtc_month_days(unsigned int month, unsigned int year);
extern int rtc_valid_tm(struct rtc_time *tm);
extern int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time);
extern void rtc_time_to_tm(unsigned long time, struct rtc_time *tm);
struct rtc_class_ops;