diff --git a/drivers/hwmon/emc1403.c b/drivers/hwmon/emc1403.c
index 90ec1173b8a1..01723f04fe45 100644
--- a/drivers/hwmon/emc1403.c
+++ b/drivers/hwmon/emc1403.c
@@ -163,7 +163,7 @@ static ssize_t store_hyst(struct device *dev,
 	if (retval < 0)
 		goto fail;
 
-	hyst = val - retval * 1000;
+	hyst = retval * 1000 - val;
 	hyst = DIV_ROUND_CLOSEST(hyst, 1000);
 	if (hyst < 0 || hyst > 255) {
 		retval = -ERANGE;
@@ -330,7 +330,7 @@ static int emc1403_detect(struct i2c_client *client,
 	}
 
 	id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
-	if (id != 0x01)
+	if (id < 0x01 || id > 0x04)
 		return -ENODEV;
 
 	return 0;
@@ -355,9 +355,9 @@ static int emc1403_probe(struct i2c_client *client,
 	if (id->driver_data)
 		data->groups[1] = &emc1404_group;
 
-	hwmon_dev = hwmon_device_register_with_groups(&client->dev,
-						      client->name, data,
-						      data->groups);
+	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
+							   client->name, data,
+							   data->groups);
 	if (IS_ERR(hwmon_dev))
 		return PTR_ERR(hwmon_dev);