The patch titled
rtc: Add rtc_merge_alarm()
has been removed from the -mm tree. Its filename was
rtc-add-rtc_merge_alarm.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: rtc: Add rtc_merge_alarm()
From: Scott Wood <scottwood@xxxxxxxxxxxxx>
Add rtc_merge_alarm(), which can be used by rtc drivers to turn a partially
specified alarm expiry (i.e. most significant fields set to -1, as with the
RTC_ALM_SET ioctl()) into a fully specified expiry.
If the most significant specified field is earlier than the current time, the
least significant unspecified field is incremented.
Signed-off-by: Scott Wood <scottwood@xxxxxxxxxxxxx>
Acked-by: Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/rtc/rtc-lib.c | 81 ++++++++++++++++++++++++++++++++++++++++
include/linux/rtc.h | 1
2 files changed, 82 insertions(+)
diff -puN drivers/rtc/rtc-lib.c~rtc-add-rtc_merge_alarm drivers/rtc/rtc-lib.c
--- a/drivers/rtc/rtc-lib.c~rtc-add-rtc_merge_alarm
+++ a/drivers/rtc/rtc-lib.c
@@ -117,4 +117,85 @@ int rtc_tm_to_time(struct rtc_time *tm,
}
EXPORT_SYMBOL(rtc_tm_to_time);
+
+/* Merge the valid (i.e. non-negative) fields of alarm into the current
+ * time. If the valid alarm fields are earlier than the equivalent
+ * fields in the time, carry one into the least significant invalid
+ * field, so that the alarm expiry is in the future. It assumes that the
+ * least significant invalid field is more significant than the most
+ * significant valid field, and that the seconds field is valid.
+ *
+ * This is used by alarms that take relative (rather than absolute)
+ * times, and/or have a simple binary second counter instead of
+ * day/hour/minute/sec registers.
+ */
+void rtc_merge_alarm(struct rtc_time *now, struct rtc_time *alarm)
+{
+ int *alarmp = &alarm->tm_sec;
+ int *timep = &now->tm_sec;
+ int carry_into, i;
+
+ /* Ignore everything past the 6th element (tm_year). */
+ for (i = 5; i > 0; i--) {
+ if (alarmp[i] < 0)
+ alarmp[i] = timep[i];
+ else
+ break;
+ }
+
+ /* No carry needed if all fields are valid. */
+ if (i == 5)
+ return;
+
+ for (carry_into = i + 1; i >= 0; i--) {
+ if (alarmp[i] < timep[i])
+ break;
+
+ if (alarmp[i] > timep[i])
+ return;
+ }
+
+ switch (carry_into) {
+ case 1:
+ alarm->tm_min++;
+
+ if (alarm->tm_min < 60)
+ return;
+
+ alarm->tm_min = 0;
+ /* fall-through */
+
+ case 2:
+ alarm->tm_hour++;
+
+ if (alarm->tm_hour < 60)
+ return;
+
+ alarm->tm_hour = 0;
+ /* fall-through */
+
+ case 3:
+ alarm->tm_mday++;
+
+ if (alarm->tm_mday <= rtc_days_in_month[alarm->tm_mon])
+ return;
+
+ alarm->tm_mday = 1;
+ /* fall-through */
+
+ case 4:
+ alarm->tm_mon++;
+
+ if (alarm->tm_mon <= 12)
+ return;
+
+ alarm->tm_mon = 1;
+ /* fall-through */
+
+ case 5:
+ alarm->tm_year++;
+ }
+}
+EXPORT_SYMBOL(rtc_merge_alarm);
+
MODULE_LICENSE("GPL");
diff -puN include/linux/rtc.h~rtc-add-rtc_merge_alarm include/linux/rtc.h
--- a/include/linux/rtc.h~rtc-add-rtc_merge_alarm
+++ a/include/linux/rtc.h
@@ -106,6 +106,7 @@ extern int rtc_year_days(unsigned int da
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);
+extern void rtc_merge_alarm(struct rtc_time *now, struct rtc_time *alarm);
#include <linux/device.h>
#include <linux/seq_file.h>
_
Patches currently in -mm which might be from scottwood@xxxxxxxxxxxxx are
origin.patch
-
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