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drivers: rtc: resolve year 2038 problem in rtc_to_tm

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Our implementation of rtc_to_tm() cannot handle dates of more than
0x7fffffff seconds after 1970-01-01.

Adopt the Linux kernel implementation.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt
2018-07-07 23:39:11 +02:00
committed by Tom Rini
parent 0938cff737
commit 992c1db455
5 changed files with 90 additions and 47 deletions
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16
include/rtc.h
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@@ -208,7 +208,18 @@ void rtc_write32(int reg, u32 value);
* rtc_init() - Set up the real time clock ready for use
*/
void rtc_init(void);
#endif
#endif /* CONFIG_DM_RTC */
/**
* is_leap_year - Check if year is a leap year
*
* @year Year
* @return 1 if leap year
*/
static inline bool is_leap_year(unsigned int year)
{
return (!(year % 4) && (year % 100)) || !(year % 400);
}
/**
* rtc_calc_weekday() - Work out the weekday from a time
@@ -231,9 +242,8 @@ int rtc_calc_weekday(struct rtc_time *time);
*
* @time_t: Number of seconds since 1970-01-01 00:00:00
* @time: Place to put the broken-out time
* @return 0 if OK, -EINVAL if the weekday could not be determined
*/
int rtc_to_tm(int time_t, struct rtc_time *time);
void rtc_to_tm(u64 time_t, struct rtc_time *time);
/**
* rtc_mktime() - Convert a broken-out time into a time_t value