snd_seq_port_callback  100 include/sound/seq_kernel.h void snd_port_init_callback(struct snd_seq_port_callback *p);
snd_seq_port_callback  101 include/sound/seq_kernel.h struct snd_seq_port_callback *snd_port_alloc_callback(void);
snd_seq_port_callback  104 include/sound/seq_kernel.h int snd_seq_event_port_attach(int client, struct snd_seq_port_callback *pcbp,