KS_EEPCR
val = ks8851_rdreg16(ks, KS_EEPCR);
ks8851_wrreg16(ks, KS_EEPCR, val);
ks8851_wrreg16(ks, KS_EEPCR, EEPCR_EESA | EEPCR_EECS);
unsigned val = ks8851_rdreg16(ks, KS_EEPCR);
ks8851_wrreg16(ks, KS_EEPCR, val & ~EEPCR_EESA);