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hwmon: (tmp421) Fix temperature conversions 

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@linux-fr.org>
Tested-by: Andre Prendel <andre.prendel@gmx.de>
Cc: stable@kernel.org
This commit is contained in:
Jean Delvare 2010-03-05 22:17:25 +01:00
parent 8d59582a86
commit a44908d742
1 changed files with 4 additions and 2 deletions
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6
drivers/hwmon/tmp421.c
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@ -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;