linux-kernel - [PATCH 2/4] rtc: mcp795: fix time range difference between linux and RTC chip

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Date:   Mon,  5 Dec 2016 14:11:51 +0100
From:   Emil Bartczak <emilbart@...il.com>
To:     a.zummo@...ertech.it
Cc:     alexandre.belloni@...e-electrons.com, rtc-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, Emil Bartczak <emilbart@...il.com>
Subject: [PATCH 2/4] rtc: mcp795: fix time range difference between linux and RTC chip

In linux rtc_time struct, tm_mon range is 0~11, while in RTC HW REG,
month range is 1~12. This patch adjusts difference of them.
---
 drivers/rtc/rtc-mcp795.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-mcp795.c b/drivers/rtc/rtc-mcp795.c
index 266328b..d15072c 100644
--- a/drivers/rtc/rtc-mcp795.c
+++ b/drivers/rtc/rtc-mcp795.c
@@ -96,6 +96,7 @@ static int mcp795_rtcc_set_bits(struct device *dev, u8 addr, u8 mask, u8 state)
 
 static int mcp795_set_time(struct device *dev, struct rtc_time *tim)
 {
+	int month;
 	int ret;
 	u8 data[7];
 
@@ -109,8 +110,9 @@ static int mcp795_set_time(struct device *dev, struct rtc_time *tim)
 	data[1] = (data[1] & 0x80) | ((tim->tm_min / 10) << 4) | (tim->tm_min % 10);
 	data[2] = ((tim->tm_hour / 10) << 4) | (tim->tm_hour % 10);
 	data[4] = ((tim->tm_mday / 10) << 4) | ((tim->tm_mday) % 10);
+	month = tim->tm_mon + 1;
 	data[5] = (data[5] & MCP795_LP_BIT) |
-			((tim->tm_mon / 10) << 4) | (tim->tm_mon % 10);
+			((month / 10) << 4) | (month % 10);
 
 	if (tim->tm_year > 100)
 		tim->tm_year -= 100;
@@ -143,7 +145,7 @@ static int mcp795_read_time(struct device *dev, struct rtc_time *tim)
 	tim->tm_min	= ((data[1] & 0x70) >> 4) * 10 + (data[1] & 0x0f);
 	tim->tm_hour	= ((data[2] & 0x30) >> 4) * 10 + (data[2] & 0x0f);
 	tim->tm_mday	= ((data[4] & 0x30) >> 4) * 10 + (data[4] & 0x0f);
-	tim->tm_mon	= ((data[5] & 0x10) >> 4) * 10 + (data[5] & 0x0f);
+	tim->tm_mon	= ((data[5] & 0x10) >> 4) * 10 + (data[5] & 0x0f) - 1;
 	tim->tm_year	= ((data[6] & 0xf0) >> 4) * 10 + (data[6] & 0x0f) + 100; /* Assume we are in 20xx */
 
 	dev_dbg(dev, "Read from mcp795: %04d-%02d-%02d %02d:%02d:%02d\n",
-- 
2.7.4