---
name: "iichid"
section: "4"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd"]
url: "https://new.carta.tech/iichid"
---

# iichid(4)

I2C HID transport driver

## NAME

**iichid** – I2C HID transport driver

## SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configuration file:

**device iichid**

Alternatively, to load the driver as a module at boot time, place the following line in [loader.conf(5)](/loader.conf/5.md):

```
iichid_load="YES"
```

## DESCRIPTION

The **iichid** driver provides a interface to I2C Human Interface Devices (HIDs).

## SYSCTL VARIABLES

Next parameters are available as [sysctl(8)](/sysctl/8.md) variables. Debug parameter is available as [loader(8)](/loader/8.md) tunable as well.

- *dev.iichid.\*.sampling\_rate\_fast*

  Active sampling rate in num/second (for sampling mode).

- *dev.iichid.\*.sampling\_rate\_slow*

  Idle sampling rate in num/second (for sampling mode).

- *dev.iichid.\*.sampling\_hysteresis*

  Number of missing samples before enabling of slow mode (for sampling mode).

- *hw.iichid.debug*

  Debug output level, where 0 is debugging disabled and larger values increase debug message verbosity. Default is 0.

## SEE ALSO

[ig4(4)](/ig4/4.md)

## BUGS

The **iichid** does not support GPIO interrupts yet. In that case **iichid** enables sampling mode with periodic polling of hardware by driver means. See dev.iichid.\*.sampling\_\* [sysctl(8)](/sysctl/8.md) variables for tuning of sampling parameters.

## HISTORY

The **iichid** driver first appeared in FreeBSD 13.0.

## AUTHORS

The **iichid** driver was written by Marc Priggemeyer ⟨*marc.priggemeyer@gmail.com*⟩ and Vladimir Kondratyev ⟨*wulf@FreeBSD.org*⟩.

This manual page was written by Vladimir Kondratyev ⟨*wulf@FreeBSD.org*⟩.