GOODIX_BERLIN_SPI_WRITE_PREFIX_LEN
xfers.len = GOODIX_BERLIN_SPI_WRITE_PREFIX_LEN + len;
regmap_config.max_raw_write = max_size - GOODIX_BERLIN_SPI_WRITE_PREFIX_LEN;
kzalloc(GOODIX_BERLIN_SPI_WRITE_PREFIX_LEN + len, GFP_KERNEL);
memcpy(buf + GOODIX_BERLIN_SPI_WRITE_PREFIX_LEN,