XREG_PRODUCT_ID
if (xc4000_readreg(priv, XREG_PRODUCT_ID, &hwmodel) < 0) {
if (xc4000_readreg(priv, XREG_PRODUCT_ID, &id) != 0)
if (xc5000_readreg(priv, XREG_PRODUCT_ID, &id) != 0)
ret = xc5000_readreg(priv, XREG_PRODUCT_ID, &id);