From: Derek Nguyen derek.nguyen@collins.com
[ Upstream commit 07e06193ead86d4812f431b4d87bbd4161222e3f ]
The LTC2947 datasheet (Rev. B) calls out in the section "Register Description: Non-Accumulated Result Registers" (pg. 30) that "To calculate temperature, multiply the TEMP register value by 0.204°C and add 5.5°C". Fix to add 5.5C and not 0.55C.
Fixes: 9f90fd652bed ("hwmon: Add support for ltc2947") Signed-off-by: Derek Nguyen derek.nguyen@collins.com Signed-off-by: Brandon Maier brandon.maier@collins.com Link: https://lore.kernel.org/r/20221110192108.20624-1-brandon.maier@collins.com Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hwmon/ltc2947-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwmon/ltc2947-core.c b/drivers/hwmon/ltc2947-core.c index 5423466de697..e918490f3ff7 100644 --- a/drivers/hwmon/ltc2947-core.c +++ b/drivers/hwmon/ltc2947-core.c @@ -396,7 +396,7 @@ static int ltc2947_read_temp(struct device *dev, const u32 attr, long *val, return ret;
/* in milidegrees celcius, temp is given by: */ - *val = (__val * 204) + 550; + *val = (__val * 204) + 5500;
return 0; }