IT87_REG_FAN_CTL
tmp = it87_read_value(data, IT87_REG_FAN_CTL);
it87_write_value(data, IT87_REG_FAN_CTL, tmp | BIT(nr));
data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL) & 0x8f;
it87_write_value(data, IT87_REG_FAN_CTL, data->fan_ctl);
int tmp = it87_read_value(data, IT87_REG_FAN_CTL);
it87_write_value(data, IT87_REG_FAN_CTL,
data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL);