lock		intr_lock	

open			x		x
close			x		x
drain			x		x
init_output		x		x
init_input		x		x
start_output		x		x
start_input		x		x
halt_output		x		x
halt_input		x		x
speaker_ctl		x		x
trigger_output		x		x
trigger_input		x		x
setfd			x		x
query_encoding		x
set_params		x
round_blocksize		x
commit_settings		x
getdev			x
get_port		x
set_port		x
query_devinfo		x
round_buffersize	x
mappage			x
get_props		x
dev_ioctl		x
powerstate		x
allocm
freem
get_locks