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157 lines
2.8 KiB
C
157 lines
2.8 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 1.2 93/10/11 11:53:28 julian Exp Locker: julian $
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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 <scsi/scsi_all.h>
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#include <scsi/scsiconf.h>
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#define NUK 16
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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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{
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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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0, 0
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};
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struct uk_data {
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u_int32 flags;
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struct scsi_link *sc_link; /* all the inter level info */
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} uk_data[NUK];
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#define UK_KNOWN 0x02
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static u_int32 next_uk_unit = 0;
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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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errval
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ukattach(sc_link)
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struct scsi_link *sc_link;
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{
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u_int32 unit, i, stat;
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unsigned char *tbl;
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SC_DEBUG(sc_link, SDEV_DB2, ("ukattach: "));
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/*
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* Check we have the resources for another drive
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*/
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unit = next_uk_unit++;
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if (unit >= NUK) {
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printf("Too many unknown devices..(%d > %d) reconfigure kernel\n",
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(unit + 1), NUK);
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return (0);
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}
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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_data[unit].sc_link = sc_link;
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sc_link->device = &uk_switch;
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sc_link->dev_unit = unit;
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printf("uk%d: unknown device\n", unit);
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uk_data[unit].flags = UK_KNOWN;
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return;
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}
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/*
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* open the device.
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*/
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errval
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ukopen(dev)
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{
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errval errcode = 0;
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u_int32 unit, mode;
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struct scsi_link *sc_link;
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unit = minor(dev);
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/*
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* Check the unit is legal
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*/
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if (unit >= NUK) {
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printf("uk%d: uk %d > %d\n", unit, unit, NUK);
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return ENXIO;
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}
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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_data[unit].flags & UK_KNOWN) == 0) {
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printf("uk%d: not set up\n", unit);
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return ENXIO;
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}
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/*
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* Only allow one at a time
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*/
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sc_link = uk_data[unit].sc_link;
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if (sc_link->flags & SDEV_OPEN) {
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printf("uk%d: already open\n", unit);
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return ENXIO;
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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"
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,dev, unit, NUK));
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/*
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* Catch any unit attention errors.
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*/
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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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errval
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ukclose(dev)
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{
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unsigned char unit, mode;
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struct scsi_link *sc_link;
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sc_link = uk_data[unit].sc_link;
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SC_DEBUG(sc_link, SDEV_DB1, ("Closing device"));
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sc_link->flags &= ~SDEV_OPEN;
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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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errval
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ukioctl(dev, cmd, arg, mode)
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dev_t dev;
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u_int32 cmd;
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caddr_t arg;
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{
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unsigned char unit;
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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 = minor(dev);
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sc_link = uk_data[unit].sc_link;
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return(scsi_do_ioctl(sc_link,cmd,arg,mode));
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}
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