hwmon: (pmbus) Improve fan detection

Some PMBus devices return no error when reading fan speed registers, but don't
really support fans. Strengthen fan detection by also checking if fan
configuration registers exist.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
Cc: stable.kernel.org # 2.6.39

drivers/hwmon/pmbus.c

@@ -47,12 +47,14 @@ static void pmbus_find_sensor_groups(struct i2c_client *client,
 	if (info->func[0]
 	    && pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT))
 		info->func[0] |= PMBUS_HAVE_STATUS_INPUT;
-	if (pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) {
+	if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_12) &&
+	    pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) {
 		info->func[0] |= PMBUS_HAVE_FAN12;
 		if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_12))
 			info->func[0] |= PMBUS_HAVE_STATUS_FAN12;
 	}
-	if (pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) {
+	if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_34) &&
+	    pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) {
 		info->func[0] |= PMBUS_HAVE_FAN34;
 		if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_34))
 			info->func[0] |= PMBUS_HAVE_STATUS_FAN34;