hci_disconnect
int hci_disconnect(struct hci_conn *conn, __u8 reason);
hci_disconnect(c, HCI_ERROR_REMOTE_USER_TERM);
hci_disconnect(conn, HCI_ERROR_AUTH_FAILURE);
hci_disconnect(conn, HCI_ERROR_AUTH_FAILURE);
hci_disconnect(conn, HCI_ERROR_AUTH_FAILURE);
hci_disconnect(conn, HCI_ERROR_AUTH_FAILURE);
hci_disconnect(conn->hcon, HCI_ERROR_AUTH_FAILURE);
hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE);