NetBSD/sys/scsi/uk.c

/*	$NetBSD: uk.c,v 1.7 1994/06/29 06:43:25 cgd Exp $	*/

/*
 * Copyright (c) 1994 Charles Hannum.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Charles Hannum.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/* 
 * Dummy driver for a device we can't identify.
 * Originally by Julian Elischer (julian@tfs.com)
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>

#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>

#define	UKUNIT(z)	(minor(z))

struct uk_data {
	struct device sc_dev;

	struct scsi_link *sc_link;	/* all the inter level info */
};

void ukattach __P((struct device *, struct device *, void *));

struct cfdriver ukcd = {
	NULL, "uk", scsi_targmatch, ukattach, DV_DULL, sizeof(struct uk_data)
};

/*
 * This driver is so simple it uses all the default services
 */
struct scsi_device uk_switch = {
	NULL,
	NULL,
	NULL,
	NULL,
	"uk",
	0
};

/*
 * The routine called by the low level scsi routine when it discovers
 * a device suitable for this driver.
 */
void
ukattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct uk_data *uk = (void *)self;
	struct scsi_link *sc_link = aux;

	SC_DEBUG(sc_link, SDEV_DB2, ("ukattach: "));

	/*
	 * Store information needed to contact our base driver
	 */
	uk->sc_link = sc_link;
	sc_link->device = &uk_switch;
	sc_link->dev_unit = uk->sc_dev.dv_unit;

	printf(": unknown device\n");
}

/*
 * open the device.
 */
int
ukopen(dev)
	dev_t dev;
{
	int unit;
	struct uk_data *uk;
	struct scsi_link *sc_link;

	unit = UKUNIT(dev);

	if (unit >= ukcd.cd_ndevs)
		return ENXIO;
	uk = ukcd.cd_devs[unit];
	if (!uk)
		return ENXIO;
		
	sc_link = uk->sc_link;

	/*
	 * Only allow one at a time
	 */
	if (sc_link->flags & SDEV_OPEN) {
		printf("%s: already open\n", uk->sc_dev.dv_xname);
		return EBUSY;
	}

	sc_link->flags |= SDEV_OPEN;
	SC_DEBUG(sc_link, SDEV_DB1,
	    ("ukopen: dev=0x%x (unit %d (of %d))\n", unit, ukcd.cd_ndevs));

	return 0;
}

/*
 * close the device.. only called if we are the LAST
 * occurence of an open device
 */
int
ukclose(dev)
	dev_t dev;
{
	int unit;
	struct uk_data *uk;

	unit = UKUNIT(dev);
	uk = ukcd.cd_devs[unit];
	uk->sc_link->flags &= ~SDEV_OPEN;
	SC_DEBUG(uk->sc_link, SDEV_DB1, ("closed\n"));
	return 0;
}

/*
 * Perform special action on behalf of the user
 * Only does generic scsi ioctls.
 */
int
ukioctl(dev, cmd, addr, flag)
	dev_t dev;
	int cmd;
	caddr_t addr;
	int flag;
{
	int unit;
	register struct uk_data *uk;
	struct scsi_link *sc_link;

	/*
	 * Find the device that the user is talking about
	 */
	unit = UKUNIT(dev);
	uk = ukcd.cd_devs[unit];
	return scsi_do_ioctl(uk->sc_link, cmd, addr, flag));
}