4.4BSD/usr/src/sys/vax/uba/adreg.h

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/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)adreg.h	7.2 (Berkeley) 12/22/87
 */

struct addevice {
	short int ad_csr;			/* Control status register */
	short int ad_data;			/* Data buffer */
};

#define AD_CHAN		ADIOSCHAN
#define AD_READ		ADIOGETW
#define	ADIOSCHAN	_IOW('a', 0, int)	/* set channel */
#define	ADIOGETW	_IOR('a', 1, int)	/* read one word */

/*
 * Unibus CSR register bits
 */

#define AD_START		01
#define AD_SCHMITT		020
#define AD_CLOCK		040
#define AD_IENABLE		0100
#define AD_DONE 		0200
#define AD_INCENABLE		040000
#define AD_ERROR		0100000