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

parent 8d59582a

drivers/hwmon/tmp421.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -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;