http://www.comedi.org/

The Comedi project develops open-source drivers, tools, and libraries for data acquisition.

Comedi is a collection of drivers for a variety of common data acquisition plug-in boards. The drivers are implemented as a core Linux kernel module providing common functionality and individual low-level driver modules. Comedilib is a user-space library that provides a developer-friendly interface to Comedi devices. Included in the Comedilib distribution is documentation, configuration and calibration utilities, and demonstration programs. Kcomedilib is a Linux kernel module (distributed with Comedi) that provides the same interface as Comedilib in kernel space, suitable for real-time tasks. It is effectively a “kernel library” for using Comedi from real-time tasks.

• Integrated real-time support for most hardware
• High-level library (comedilib)
• Application-level device independence
• Works with Linux 2.0, 2.2, 2.4, 2.6 kernels

See http://www.comedi.org/hardware.html for supported hardware