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revert "rtc: Add rtc_merge_alarm()"

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David says "884b4aaaa242a2db8c8252796f0118164a680ab5 should be reverted.  It
added an rtc_merge_alarm() call to the 2.6.20 kernel, which hasn't yet been
used by any in-tree driver; this patch obviates the need for that call, and
uses a more robust approach."

Cc: Scott Wood <scottwood@freescale.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2007-05-08 00:34:05 -07:00 committed by Linus Torvalds
parent 19bfe37caa
commit 416ce32e70
2 changed files with 0 additions and 82 deletions
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81
drivers/rtc/rtc-lib.c
View file

@ -117,85 +117,4 @@ int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time)
}
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");

1
include/linux/rtc.h
View file

@ -106,7 +106,6 @@ extern int rtc_year_days(unsigned int day, 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);
extern void rtc_merge_alarm(struct rtc_time *now, struct rtc_time *alarm);
#include <linux/device.h>
#include <linux/seq_file.h>