i8k_get_fan_status
err = i8k_get_fan_status(data, i);
val = i8k_get_fan_status(data, val);
val = i8k_get_fan_status(data, val);
left_fan = i8k_get_fan_status(data, I8K_FAN_LEFT); /* 580 µs */
right_fan = i8k_get_fan_status(data, I8K_FAN_RIGHT); /* 580 µs */
ret = i8k_get_fan_status(cdata->data, cdata->fan_num);
ret = i8k_get_fan_status(data, channel);
ret = i8k_get_fan_status(data, channel);