Messages in this thread Patch in this message | | | From | Xunlei Pang <> | Subject | [PATCH v2 2/4] rtc/lib: Introduce rtc_tm_subtract() helper function | Date | Tue, 2 Jun 2015 17:04:20 +0800 |
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From: Xunlei Pang <pang.xunlei@linaro.org>
There're many sites need comparing the two rtc_time variants for many rtc drivers, especially in the instances of rtc_class_ops::set_alarm().
So add this common helper function to make things easy.
Suggested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org> --- drivers/rtc/rtc-lib.c | 9 +++++++++ include/linux/rtc.h | 2 ++ 2 files changed, 11 insertions(+)
diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c index e6bfb9c..fdb94cc 100644 --- a/drivers/rtc/rtc-lib.c +++ b/drivers/rtc/rtc-lib.c @@ -124,6 +124,15 @@ time64_t rtc_tm_to_time64(struct rtc_time *tm) EXPORT_SYMBOL(rtc_tm_to_time64); /* + * rtc_tm_subtract - Return the difference in seconds. + */ +time64_t rtc_tm_subtract(struct rtc_time *minuend, struct rtc_time *subtrahend) +{ + return rtc_tm_to_time64(minuend) - rtc_tm_to_time64(subtrahend); +} +EXPORT_SYMBOL_GPL(rtc_tm_subtract); + +/* * Convert rtc_time to ktime */ ktime_t rtc_tm_to_ktime(struct rtc_time tm) diff --git a/include/linux/rtc.h b/include/linux/rtc.h index 8dcf682..13e4138 100644 --- a/include/linux/rtc.h +++ b/include/linux/rtc.h @@ -21,6 +21,8 @@ extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year extern int rtc_valid_tm(struct rtc_time *tm); extern time64_t rtc_tm_to_time64(struct rtc_time *tm); extern void rtc_time64_to_tm(time64_t time, struct rtc_time *tm); +extern time64_t rtc_tm_subtract(struct rtc_time *minuend, + struct rtc_time *subtrahend); ktime_t rtc_tm_to_ktime(struct rtc_time tm); struct rtc_time rtc_ktime_to_tm(ktime_t kt); -- 1.9.1
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