The low bits of temperature registers are status bits, they must be
masked out before converting the register values to temperatures.
Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
Cc: Andre Prendel <andre.prendel@xxxxxx>
Cc: stable@xxxxxxxxxx
---
drivers/hwmon/tmp421.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- linux-2.6.34-rc0.orig/drivers/hwmon/tmp421.c 2010-03-04 14:05:09.000000000 +0100
+++ linux-2.6.34-rc0/drivers/hwmon/tmp421.c 2010-03-04 14:13:27.000000000 +0100
@@ -80,14 +80,16 @@ struct tmp421_data {
static int temp_from_s16(s16 reg)
{
- int temp = reg;
+ /* Mask out status bits */
+ int temp = reg & ~0xf;
return (temp * 1000 + 128) / 256;
}
static int temp_from_u16(u16 reg)
{
- int temp = reg;
+ /* Mask out status bits */
+ int temp = reg & ~0xf;
/* Add offset for extended temperature range. */
temp -= 64 * 256;
--
Jean Delvare
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