148 lines
2.6 KiB
C
148 lines
2.6 KiB
C
/*
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* Dummy driver for a device we can't identify.
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* by Julian Elischer (julian@tfs.com)
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*
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* $Id: uk.c,v 1.4 1994/02/16 02:41:10 mycroft Exp $
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <sys/device.h>
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#include <scsi/scsi_all.h>
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#include <scsi/scsiconf.h>
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#define UKUNIT(z) (minor(z))
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struct uk_data {
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struct device sc_dev;
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u_int32 flags;
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#define UKINIT 0x01
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struct scsi_link *sc_link; /* all the inter level info */
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};
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void ukattach __P((struct device *, struct device *, void *));
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struct cfdriver ukcd =
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{ NULL, "uk", scsi_targmatch, ukattach, DV_DULL, sizeof(struct uk_data) };
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/*
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* This driver is so simple it uses all the default services
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*/
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struct scsi_device uk_switch = {
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NULL,
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NULL,
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NULL,
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NULL,
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"uk",
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0
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};
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/*
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* The routine called by the low level scsi routine when it discovers
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* a device suitable for this driver.
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*/
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void
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ukattach(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct uk_data *uk = (struct uk_data *)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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/*
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* Store information needed to contact our base driver
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*/
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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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uk->flags |= UKINIT;
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}
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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;
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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)
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return ENXIO;
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uk = ukcd.cd_devs[unit];
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/*
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* Make sure the device has been initialised
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*/
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if (!uk || !(uk->cflags & UKINIT))
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return ENXIO;
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sc_link = uk->sc_link;
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/*
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* Only allow one at a time
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*/
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if (sc_link->flags & SDEV_OPEN) {
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printf("%s: already open\n", uk->sc_dev.dv_xname);
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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,
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("ukopen: dev=0x%x (unit %d (of %d))\n", unit, ukcd.cd_ndevs));
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return 0;
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}
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/*
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* close the device.. only called if we are the LAST
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* occurence of an open device
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*/
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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;
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struct uk_data *uk;
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unit = UKUNIT(dev);
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uk = ukcd.cd_devs[unit];
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uk->sc_link->flags &= ~SDEV_OPEN;
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SC_DEBUG(uk->sc_link, SDEV_DB1, ("closed\n"));
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return 0;
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}
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/*
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* Perform special action on behalf of the user
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* Only does generic scsi ioctls.
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*/
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int
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ukioctl(dev, cmd, addr, flag)
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dev_t dev;
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int cmd;
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caddr_t addr;
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int flag;
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{
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int unit;
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register struct uk_data *uk;
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struct scsi_link *sc_link;
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/*
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* Find the device that the user is talking about
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*/
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unit = UKUNIT(dev);
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uk = ukcd.cd_devs[unit];
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return scsi_do_ioctl(uk->sc_link, cmd, addr, flag));
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}
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