audiodev: Implement stop/restart functionality

This is used mainly for end-stop detection.

Signed-off-by: David Jander <djander@gmail.com>
gpio: Implement input debouncing

Signed-off-by: David Jander <djander@gmail.com>
Grunner: implement homing

WIP

Signed-off-by: David Jander <djander@gmail.com>
Add preliminary support for hwmon temperature sensor

Added support for reading temperature from a 100k thermistor connected via
an opamp to a hwmon-based ADC

Signed-off-by: David Jander <djander@gmail.com>
GPIO: Added support for GPIO outputs

Signed-off-by: David Jander <djander@gmail.com>