diff options
Diffstat (limited to 'drivers/hwmon/ad7314.c')
| -rw-r--r-- | drivers/hwmon/ad7314.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/hwmon/ad7314.c b/drivers/hwmon/ad7314.c index 7802bbf5f958..59424103f634 100644 --- a/drivers/hwmon/ad7314.c +++ b/drivers/hwmon/ad7314.c @@ -22,11 +22,13 @@ */ #define AD7314_TEMP_MASK 0x7FE0 #define AD7314_TEMP_SHIFT 5 +#define AD7314_LEADING_ZEROS_MASK BIT(15) /* * ADT7301 and ADT7302 temperature masks */ #define ADT7301_TEMP_MASK 0x3FFF +#define ADT7301_LEADING_ZEROS_MASK (BIT(15) | BIT(14)) enum ad7314_variant { adt7301, @@ -65,12 +67,20 @@ static ssize_t ad7314_temperature_show(struct device *dev, return ret; switch (spi_get_device_id(chip->spi_dev)->driver_data) { case ad7314: + if (ret & AD7314_LEADING_ZEROS_MASK) { + /* Invalid read-out, leading zero part is missing */ + return -EIO; + } data = (ret & AD7314_TEMP_MASK) >> AD7314_TEMP_SHIFT; data = sign_extend32(data, 9); return sprintf(buf, "%d\n", 250 * data); case adt7301: case adt7302: + if (ret & ADT7301_LEADING_ZEROS_MASK) { + /* Invalid read-out, leading zero part is missing */ + return -EIO; + } /* * Documented as a 13 bit twos complement register * with a sign bit - which is a 14 bit 2's complement |