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authorEmil Bartczak <emilbart@gmail.com>2016-12-08 02:27:37 +0300
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2016-12-19 02:59:22 +0300
commitbcf18d88ac16c1a86bac7e8f5f4b1de1f752865f (patch)
tree682300c7954114742262a5d310737f74a847a8b4 /drivers/rtc
parent0b6a8f5c9bebe51b95ff23939db570e8d298a36f (diff)
downloadlinux-bcf18d88ac16c1a86bac7e8f5f4b1de1f752865f.tar.xz
rtc: mcp795: use bcd2bin/bin2bcd.
Change rtc-mcp795.c to use the bcd2bin/bin2bcd functions. This change fixes the wrong conversion of month value from binary to BCD (missing right shift operation for 10 month). Signed-off-by: Emil Bartczak <emilbart@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-mcp795.c25
1 files changed, 13 insertions, 12 deletions
diff --git a/drivers/rtc/rtc-mcp795.c b/drivers/rtc/rtc-mcp795.c
index 4021fd04cb0a..0389ee03c660 100644
--- a/drivers/rtc/rtc-mcp795.c
+++ b/drivers/rtc/rtc-mcp795.c
@@ -21,6 +21,7 @@
#include <linux/spi/spi.h>
#include <linux/rtc.h>
#include <linux/of.h>
+#include <linux/bcd.h>
/* MCP795 Instructions, see datasheet table 3-1 */
#define MCP795_EEREAD 0x03
@@ -104,16 +105,16 @@ static int mcp795_set_time(struct device *dev, struct rtc_time *tim)
if (ret)
return ret;
- data[0] = (data[0] & 0x80) | ((tim->tm_sec / 10) << 4) | (tim->tm_sec % 10);
- 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);
- data[5] = (data[5] & 0x10) | (tim->tm_mon / 10) | (tim->tm_mon % 10);
+ data[0] = (data[0] & 0x80) | bin2bcd(tim->tm_sec);
+ data[1] = (data[1] & 0x80) | bin2bcd(tim->tm_min);
+ data[2] = bin2bcd(tim->tm_hour);
+ data[4] = bin2bcd(tim->tm_mday);
+ data[5] = (data[5] & 0x10) | bin2bcd(tim->tm_mon);
if (tim->tm_year > 100)
tim->tm_year -= 100;
- data[6] = ((tim->tm_year / 10) << 4) | (tim->tm_year % 10);
+ data[6] = bin2bcd(tim->tm_year);
ret = mcp795_rtcc_write(dev, 0x01, data, sizeof(data));
@@ -137,12 +138,12 @@ static int mcp795_read_time(struct device *dev, struct rtc_time *tim)
if (ret)
return ret;
- tim->tm_sec = ((data[0] & 0x70) >> 4) * 10 + (data[0] & 0x0f);
- 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_year = ((data[6] & 0xf0) >> 4) * 10 + (data[6] & 0x0f) + 100; /* Assume we are in 20xx */
+ tim->tm_sec = bcd2bin(data[0] & 0x7F);
+ tim->tm_min = bcd2bin(data[1] & 0x7F);
+ tim->tm_hour = bcd2bin(data[2] & 0x3F);
+ tim->tm_mday = bcd2bin(data[4] & 0x3F);
+ tim->tm_mon = bcd2bin(data[5] & 0x1F);
+ tim->tm_year = bcd2bin(data[6]) + 100; /* Assume we are in 20xx */
dev_dbg(dev, "Read from mcp795: %04d-%02d-%02d %02d:%02d:%02d\n",
tim->tm_year + 1900, tim->tm_mon, tim->tm_mday,