September 11, 2007 APS 4

### NAME

aps - ThinkPad Active Protection System accelerometer

### SYNOPSIS

aps0 at isa? port 0x1600

### DESCRIPTION

The aps driver provides support for several sensors found in some ThinkPad laptops.

The sensors currently exposed via the envsys(4) interface are:

Sensor | Units | Typical Use
```X_ACCEL` | `Integer` | `X Acceleration`
```Y_ACCEL` | `Integer` | `Y Acceleration`
```X_VAR` | `Integer` | `Weighted X Acceleration?`
```Y_VAR` | `Integer` | `Weighted Y Acceleration?`
```Temp1` | `uK` | `Unknown`
```Temp2` | `uK` | `Unknown`
```Keyboard Active` | `Boolean` | `Keyboard activity`
```Mouse Active` | `Boolean` | `Mouse activity`
```Lid Open` | `Boolean` | `Lid state`

### SEE ALSO

envsys(4), envstat(8)

### HISTORY

The aps driver first appeared in OpenBSD3.8 and then was ported to NetBSD 5.0.

### AUTHORS

The aps driver was written by Jonathan Gray <jsg@openbsd.org>
.

### CAVEATS

The aps driver does not yet maintain state and subsequently does not take evasive action when it thinks the hard drive is in danger.

The Y axis on X40 and possibly other models seems to be inverted. It is unknown how to distinguish between different versions of the accelerometer to compensate for this in the driver at this time.

As IBM provides no documentation, it is not known what all the available sensors are used for.