NetBSD/sys/scsi/uk.c

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/* $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.
*/
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/*
* Dummy driver for a device we can't identify.
* Originally by Julian Elischer (julian@tfs.com)
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*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
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#include <sys/device.h>
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#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
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#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)
};
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/*
* This driver is so simple it uses all the default services
*/
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struct scsi_device uk_switch = {
NULL,
NULL,
NULL,
NULL,
"uk",
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0
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};
/*
* The routine called by the low level scsi routine when it discovers
* a device suitable for this driver.
*/
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void
ukattach(parent, self, aux)
struct device *parent, *self;
void *aux;
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{
struct uk_data *uk = (void *)self;
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struct scsi_link *sc_link = aux;
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SC_DEBUG(sc_link, SDEV_DB2, ("ukattach: "));
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/*
* Store information needed to contact our base driver
*/
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uk->sc_link = sc_link;
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sc_link->device = &uk_switch;
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sc_link->dev_unit = uk->sc_dev.dv_unit;
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printf(": unknown device\n");
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}
/*
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* open the device.
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*/
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int
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ukopen(dev)
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dev_t dev;
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{
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int unit;
struct uk_data *uk;
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struct scsi_link *sc_link;
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unit = UKUNIT(dev);
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if (unit >= ukcd.cd_ndevs)
return ENXIO;
uk = ukcd.cd_devs[unit];
if (!uk)
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return ENXIO;
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sc_link = uk->sc_link;
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/*
* Only allow one at a time
*/
if (sc_link->flags & SDEV_OPEN) {
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printf("%s: already open\n", uk->sc_dev.dv_xname);
return EBUSY;
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}
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sc_link->flags |= SDEV_OPEN;
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SC_DEBUG(sc_link, SDEV_DB1,
("ukopen: dev=0x%x (unit %d (of %d))\n", unit, ukcd.cd_ndevs));
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return 0;
}
/*
* close the device.. only called if we are the LAST
* occurence of an open device
*/
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int
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ukclose(dev)
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dev_t dev;
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{
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int unit;
struct uk_data *uk;
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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;
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}
/*
* Perform special action on behalf of the user
* Only does generic scsi ioctls.
*/
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int
ukioctl(dev, cmd, addr, flag)
dev_t dev;
int cmd;
caddr_t addr;
int flag;
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{
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int unit;
register struct uk_data *uk;
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struct scsi_link *sc_link;
/*
* Find the device that the user is talking about
*/
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unit = UKUNIT(dev);
uk = ukcd.cd_devs[unit];
return scsi_do_ioctl(uk->sc_link, cmd, addr, flag));
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}