ad1848_set_format
.set_format = ad1848_set_format,
.set_format = ad1848_set_format,
.set_format = ad1848_set_format,
int ad1848_set_format(void *, int,
error = ad1848_set_format(ac, setmode, p, r, pfil, rfil);
.set_format = ad1848_set_format,
.set_format = ad1848_set_format,
.set_format = ad1848_set_format,