/*

 * The following is from the linux kernel scsi_error.c

 *

 *  scsi_error.c Copyright (C) 1997 Eric Youngdale

 *

 *  SCSI error/timeout handling

 *      Initial versions: Eric Youngdale.  Based upon conversations with

 *                        Leonard Zubkoff and David Miller at Linux Expo,

 *                        ideas originating from all over the place.

 *

 *	Restructured scsi_unjam_host and associated functions.

 *	September 04, 2002 Mike Anderson (andmike@us.ibm.com)

 *

 *	Forward port of Russell King's (rmk@arm.linux.org.uk) changes and

 *	minor  cleanups.

 *	September 30, 2002 Mike Anderson (andmike@us.ibm.com)

 */

#include <string.h>

#include "scsi.h"

/**

 * scsi_normalize_sense - normalize main elements from either fixed or

 *			descriptor sense data format into a common format.

 *

 * @sense_buffer:	byte array containing sense data returned by device

 * @sb_len:		number of valid bytes in sense_buffer

 * @sshdr:		pointer to instance of structure that common

 *			elements are written to.

 *

 * Notes:

 *	The "main elements" from sense data are: response_code, sense_key,

 *	asc, ascq and additional_length (only for descriptor format).

 *

 *	Typically this function can be called after a device has

 *	responded to a SCSI command with the CHECK_CONDITION status.

 *

 * Return value:

 *	1 if valid sense data information found, else 0;

 **/

int scsi_normalize_sense(const uint8_t *sense_buffer, int sb_len,

                         struct scsi_sense_hdr *sshdr)

{

	if (!sense_buffer || !sb_len)

		return 0;

	memset(sshdr, 0, sizeof(struct scsi_sense_hdr));

	sshdr->response_code = (sense_buffer[0] & 0x7f);

	if (!scsi_sense_valid(sshdr))

		return 0;

	if (sshdr->response_code >= 0x72) {

		/*

		 * descriptor format

		 */

		if (sb_len > 1)

			sshdr->sense_key = (sense_buffer[1] & 0xf);

		if (sb_len > 2)

			sshdr->asc = sense_buffer[2];

		if (sb_len > 3)

			sshdr->ascq = sense_buffer[3];

		if (sb_len > 7)

			sshdr->additional_length = sense_buffer[7];

	} else {

		/* 

		 * fixed format

		 */

		if (sb_len > 2)

			sshdr->sense_key = (sense_buffer[2] & 0xf);

		if (sb_len > 7) {

			sb_len = (sb_len < (sense_buffer[7] + 8)) ?

					 sb_len : (sense_buffer[7] + 8);

			if (sb_len > 12)

				sshdr->asc = sense_buffer[12];

			if (sb_len > 13)

				sshdr->ascq = sense_buffer[13];

		}

	}

	return 1;

}