static_config_buf_prepare_for_upload(struct sja1105_private *priv,
				     void *config_buf, int buf_len)
{
	struct sja1105_static_config *config = &priv->static_config;
	struct sja1105_table_header final_header;
	sja1105_config_valid_t valid;
	char *final_header_ptr;
	int crc_len;

	valid = sja1105_static_config_check_valid(config);
	if (valid != SJA1105_CONFIG_OK) {
		dev_err(&priv->spidev->dev,
			sja1105_static_config_error_msg[valid]);
		return -EINVAL;
	}

	/* Write Device ID and config tables to config_buf */
	sja1105_static_config_pack(config_buf, config);
	/* Recalculate CRC of the last header (right now 0xDEADBEEF).
	 * Don't include the CRC field itself.
	 */
	crc_len = buf_len - 4;
	/* Read the whole table header */
	final_header_ptr = config_buf + buf_len - SJA1105_SIZE_TABLE_HEADER;
	sja1105_table_header_packing(final_header_ptr, &final_header, UNPACK);
	/* Modify */
	final_header.crc = sja1105_crc32(config_buf, crc_len);
	/* Rewrite */
	sja1105_table_header_packing(final_header_ptr, &final_header, PACK);

	return 0;
}
Unknown