SNDRV_SEQ_PORT_CAP_DUPLEX
#define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
pinfo.capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;
port->capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;
port->capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;
port->capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;
pinfo->capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;