ad7417_write
err = ad7417_write(dev, addr, AD7417_CONFIG2, &buf, sizeof(buf));
err = ad7417_write(dev, addr, AD7417_CONFIG, &buf, sizeof(buf));
err = ad7417_write(dev, addr, AD7417_CONFIG, &buf, sizeof(buf));
static int ad7417_write(device_t dev, uint32_t addr, uint8_t reg,