esm_cmd
err = esm_cmd(sc, req, sizeof(req->hdr) + req->h_txlen, resp,
int esm_cmd(struct esm_softc *, void *, size_t, void *, size_t,
if (esm_cmd(sc, &prop, sizeof(prop), NULL, 0, 1, 0) != 0) {
esm_cmd(sc, &state, sizeof(state), NULL, 0, 1, 0);
if (esm_cmd(sc, &req, sizeof(req), &resp, sizeof(resp), 1, 0) != 0)