From: Ladislav Michl Date: Fri, 29 Jul 2005 19:15:00 +0000 (-0700) Subject: [PATCH] I2C: ds1337 - fix 12/24 hour mode bug X-Git-Tag: v2.6.13-rc5~93 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d91e16943fdaf02bf3459059abca1032589c0663;p=linux-2.6 [PATCH] I2C: ds1337 - fix 12/24 hour mode bug DS1339 manual, page 6, chapter Date and time operation: The DS1339 can be run in either 12-hour or 24-hour mode. Bit 6 of the hours register is defined as the 12-hour or 24-hour mode-select bit. When high, the 12-hour mode is selected. Patch below makes ds1337 driver work as documented in manual. Signed-off-by: Ladislav Michl Signed-off-by: Greg Kroah-Hartman Signed-off-by: Linus Torvalds --- diff --git a/drivers/i2c/chips/ds1337.c b/drivers/i2c/chips/ds1337.c index 74ece8ac1c..82cf959989 100644 --- a/drivers/i2c/chips/ds1337.c +++ b/drivers/i2c/chips/ds1337.c @@ -165,7 +165,7 @@ static int ds1337_set_datetime(struct i2c_client *client, struct rtc_time *dt) buf[0] = 0; /* reg offset */ buf[1] = BIN2BCD(dt->tm_sec); buf[2] = BIN2BCD(dt->tm_min); - buf[3] = BIN2BCD(dt->tm_hour) | (1 << 6); + buf[3] = BIN2BCD(dt->tm_hour); buf[4] = BIN2BCD(dt->tm_wday) + 1; buf[5] = BIN2BCD(dt->tm_mday); buf[6] = BIN2BCD(dt->tm_mon) + 1; @@ -344,9 +344,9 @@ static void ds1337_init_client(struct i2c_client *client) /* Ensure that device is set in 24-hour mode */ val = i2c_smbus_read_byte_data(client, DS1337_REG_HOUR); - if ((val >= 0) && (val & (1 << 6)) == 0) + if ((val >= 0) && (val & (1 << 6))) i2c_smbus_write_byte_data(client, DS1337_REG_HOUR, - val | (1 << 6)); + val & 0x3f); } static int ds1337_detach_client(struct i2c_client *client)