linux-kernel - [PATCH] rtc: rs5c348: Fix hour decoding in 12-hour mode

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Date:	Wed, 15 Aug 2012 00:21:44 +0900
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	Alessandro Zummo <a.zummo@...ertech.it>
Cc:	James Nute <newten82@...il.com>, rtc-linux@...glegroups.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] rtc: rs5c348: Fix hour decoding in 12-hour mode

Correct the offset by subtracting 20 from tm_hour before taking
the modulo 12.

Reported-and-tested-by: James Nute <newten82@...il.com>
Signed-off-by: Atsushi Nemoto <anemo@....ocn.ne.jp>
---
 drivers/rtc/rtc-rs5c348.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-rs5c348.c b/drivers/rtc/rtc-rs5c348.c
index 77074cc..fd5c7af 100644
--- a/drivers/rtc/rtc-rs5c348.c
+++ b/drivers/rtc/rtc-rs5c348.c
@@ -122,9 +122,12 @@ rs5c348_rtc_read_time(struct device *dev, struct rtc_time *tm)
 	tm->tm_min = bcd2bin(rxbuf[RS5C348_REG_MINS] & RS5C348_MINS_MASK);
 	tm->tm_hour = bcd2bin(rxbuf[RS5C348_REG_HOURS] & RS5C348_HOURS_MASK);
 	if (!pdata->rtc_24h) {
-		tm->tm_hour %= 12;
-		if (rxbuf[RS5C348_REG_HOURS] & RS5C348_BIT_PM)
+		if (rxbuf[RS5C348_REG_HOURS] & RS5C348_BIT_PM) {
+			tm->tm_hour -= 20;
+			tm->tm_hour %= 12;
 			tm->tm_hour += 12;
+		} else
+			tm->tm_hour %= 12;
 	}
 	tm->tm_wday = bcd2bin(rxbuf[RS5C348_REG_WDAY] & RS5C348_WDAY_MASK);
 	tm->tm_mday = bcd2bin(rxbuf[RS5C348_REG_DAY] & RS5C348_DAY_MASK);
-- 
1.7.0.4

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