HelenOS sources

input_activate     63 uspace/lib/input/include/io/input.h extern errno_t input_activate(input_t *);
input_activate    971 uspace/srv/hid/console/console.c 		input_activate(input);
input_activate    205 uspace/srv/hid/display/input.c 	input_activate(display->input);
HelenOS homepage, sources at GitHub