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Subject[PATCH v2 2/4] rtc/lib: Introduce rtc_tm_subtract() helper function
Date
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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