#ifndef ISA_IDS_H
#define ISA_IDS_H

/* 
 * This file defines IDs as used by ISAPnP and EISA devices.  These
 * IDs have the format:
 *
 * vendor  byte 0 bit  7    must be zero
 *		  bits 6-2  first vendor char in compressed ASCII
 *		  bits 1-0  second vendor char in compressed ASCII (bits 4-3)
 *	   byte 1 bits 7-5  second vendor char in compressed ASCII (bits 2-0)
 *                bits 4-0  third vendor char in compressed ASCII
 * product byte 0 bits 7-4  first hex digit of product number
 *		  bits 3-0  second hex digit of product number
 *	   byte 1 bits 7-4  third hex digit of product number
 *		  bits 3-0  hex digit of revision level
 *
 * ISA IDs are always expressed in little-endian order, even though
 * the underlying "meaning" is big-endian.
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include <byteswap.h>

/*
 * Construct a vendor ID from three ASCII characters
 *
 */
#define ISA_VENDOR( a, b, c )					\
	bswap_16 ( ( ( ( (a) - 'A' + 1 ) & 0x1f ) << 10 ) |	\
		   ( ( ( (b) - 'A' + 1 ) & 0x1f ) << 5 ) |	\
		   ( ( ( (c) - 'A' + 1 ) & 0x1f ) << 0 ) )

#define ISAPNP_VENDOR( a, b, c )	ISA_VENDOR ( a, b, c )
#define EISA_VENDOR( a, b, c )		ISA_VENDOR ( a, b, c )

#define	GENERIC_ISAPNP_VENDOR		ISAPNP_VENDOR ( 'P','N','P' )

/*
 * Extract product ID and revision from combined product field
 *
 */
#define ISA_PROD_ID_MASK	( 0xf0ff )
#define ISA_PROD_ID(product)	( (product) & ISA_PROD_ID_MASK )
#define ISA_PROD_REV(product)	( ( (product) & ~ISA_PROD_ID_MASK ) >> 8 )

/* Functions in isa_ids.c */
extern char * isa_id_string ( unsigned int vendor, unsigned int product );

#endif /* ISA_IDS_H */