SPI_DIR_TX
if (dir == SPI_DIR_TX)
r = spi_xmit(spi_dev, (void *)addr + j, tx_size, SPI_DIR_TX);
r = spi_xmit(spi_dev, (void *)addr + j, extra, SPI_DIR_TX);
return spi_xmit(spi_dev, padding, sizeof(padding), SPI_DIR_TX);