l2cap_add_psm
int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP));
EXPORT_SYMBOL_GPL(l2cap_add_psm);
err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);