GL520_REG_FAN_MIN
val = gl520_read_value(client, GL520_REG_FAN_MIN);
gl520_write_value(client, GL520_REG_FAN_MIN,
(gl520_read_value(client, GL520_REG_FAN_MIN)
gl520_write_value(client, GL520_REG_FAN_MIN,
(gl520_read_value(client, GL520_REG_FAN_MIN)