FAN_PERIOD_INVALID  185 drivers/hwmon/adt7462.c #define FAN_PERIOD_INVALID	65535
FAN_PERIOD_INVALID  131 drivers/hwmon/adt7470.c #define FAN_PERIOD_INVALID	65535
FAN_PERIOD_INVALID   94 drivers/hwmon/ultra45_env.c #define FAN_PERIOD_INVALID	(0xff << 8)