cxusb_i2c_xfer
if (cxusb_i2c_xfer(&adap->dev->i2c_adap, &msg, 1) != 1)
.master_xfer = cxusb_i2c_xfer,
if (cxusb_i2c_xfer(&d->i2c_adap, &msg, 1) != 1)