hardware-dependent features

[Daniel Mack <daniel@caiaq.org>]

Hi,

some of the devices the caiaq driver supports have special hardware
features such as switchable ground lift, input impedance selection or
other, hardware-specific features. On both Windows and MacOSX there are
special tools to set those features but the ALSA driver still lacks
support for them which I want to change soon. However, I couldn't find a
generic way to do that. I was thinking about a sysfs entry which is
attached to the sound card instance but didn't find a driver which did
similar things.

Also, I'd like to support the LEDs and displays on the devices and was
wondering which interface to choose for that. I've got a patch ready
which uses the generic led subsystem, but that approach seems to be a
bit ugly as I end up having one entry per led on each device in one
single folder. Any idea of a better way?

Thanks,
Daniel