F75375_REG_FAN_EXP
f75375_write16(client, F75375_REG_FAN_EXP(nr), data->pwm[nr]);
f75375_read16(client, F75375_REG_FAN_EXP(nr));
f75375_write16(client, F75375_REG_FAN_EXP(nr), data->fan_target[nr]);