i8k_set_fan
err = i8k_set_fan(data, channel, pwm);
err = i8k_set_fan(data, channel, I8K_FAN_AUTO);
err = i8k_set_fan(data, channel, data->i8k_fan_max);
err = i8k_set_fan(data, val, speed);
ret = i8k_set_fan(data, cdata->fan_num, (int)state);