projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 519fb2b7 RG |
1 | /* |
| 2 | * Dummy driver for a device we can't identify. | |
| 3 | * by Julian Elischer (julian@tfs.com) | |
| 4 | * | |
| fde1aeb2 | 5 | * $Id: uk.c,v 1.2 1993/11/25 01:37:35 wollman Exp $ |
| 519fb2b7 RG |
6 | */ |
| 7 | ||
| 519fb2b7 | 8 | #include <sys/param.h> |
| fde1aeb2 | 9 | #include "systm.h" |
| 519fb2b7 RG |
10 | #include <sys/errno.h> |
| 11 | #include <sys/ioctl.h> | |
| 12 | #include <scsi/scsi_all.h> | |
| 13 | #include <scsi/scsiconf.h> | |
| 14 | #define NUK 16 | |
| 15 | ||
| 16 | /* | |
| 17 | * This driver is so simple it uses all the default services | |
| 18 | */ | |
| 19 | struct scsi_device uk_switch = | |
| 20 | { | |
| 21 | NULL, | |
| 22 | NULL, | |
| 23 | NULL, | |
| 24 | NULL, | |
| 25 | "uk", | |
| 26 | 0, | |
| 27 | 0, 0 | |
| 28 | }; | |
| 29 | ||
| 30 | struct uk_data { | |
| 31 | u_int32 flags; | |
| 32 | struct scsi_link *sc_link; /* all the inter level info */ | |
| 33 | } uk_data[NUK]; | |
| 34 | ||
| 35 | #define UK_KNOWN 0x02 | |
| 36 | ||
| 37 | static u_int32 next_uk_unit = 0; | |
| 38 | ||
| 39 | /* | |
| 40 | * The routine called by the low level scsi routine when it discovers | |
| 41 | * a device suitable for this driver. | |
| 42 | */ | |
| 43 | errval | |
| 44 | ukattach(sc_link) | |
| 45 | struct scsi_link *sc_link; | |
| 46 | { | |
| 47 | u_int32 unit, i, stat; | |
| 48 | unsigned char *tbl; | |
| 49 | ||
| 50 | SC_DEBUG(sc_link, SDEV_DB2, ("ukattach: ")); | |
| 51 | /* | |
| 52 | * Check we have the resources for another drive | |
| 53 | */ | |
| 54 | unit = next_uk_unit++; | |
| 55 | if (unit >= NUK) { | |
| 56 | printf("Too many unknown devices..(%d > %d) reconfigure kernel\n", | |
| 57 | (unit + 1), NUK); | |
| 58 | return (0); | |
| 59 | } | |
| 60 | /* | |
| 61 | * Store information needed to contact our base driver | |
| 62 | */ | |
| 63 | uk_data[unit].sc_link = sc_link; | |
| 64 | sc_link->device = &uk_switch; | |
| 65 | sc_link->dev_unit = unit; | |
| 66 | ||
| 67 | printf("uk%d: unknown device\n", unit); | |
| 68 | uk_data[unit].flags = UK_KNOWN; | |
| 69 | ||
| 4c45483e | 70 | return 1; /* XXX ??? */ |
| 519fb2b7 RG |
71 | |
| 72 | } | |
| 73 | ||
| 74 | /* | |
| 75 | * open the device. | |
| 76 | */ | |
| 77 | errval | |
| 78 | ukopen(dev) | |
| 4c45483e | 79 | dev_t dev; |
| 519fb2b7 RG |
80 | { |
| 81 | errval errcode = 0; | |
| 82 | u_int32 unit, mode; | |
| 83 | struct scsi_link *sc_link; | |
| 84 | unit = minor(dev); | |
| 85 | ||
| 86 | /* | |
| 87 | * Check the unit is legal | |
| 88 | */ | |
| 89 | if (unit >= NUK) { | |
| 90 | printf("uk%d: uk %d > %d\n", unit, unit, NUK); | |
| 91 | return ENXIO; | |
| 92 | } | |
| 93 | ||
| 94 | /* | |
| 95 | * Make sure the device has been initialised | |
| 96 | */ | |
| 97 | if((uk_data[unit].flags & UK_KNOWN) == 0) { | |
| 98 | printf("uk%d: not set up\n", unit); | |
| 99 | return ENXIO; | |
| 100 | } | |
| 101 | ||
| 102 | /* | |
| 103 | * Only allow one at a time | |
| 104 | */ | |
| 105 | sc_link = uk_data[unit].sc_link; | |
| 106 | if (sc_link->flags & SDEV_OPEN) { | |
| 107 | printf("uk%d: already open\n", unit); | |
| 108 | return ENXIO; | |
| 109 | } | |
| 110 | sc_link->flags |= SDEV_OPEN; | |
| 111 | SC_DEBUG(sc_link, SDEV_DB1, ("ukopen: dev=0x%x (unit %d (of %d))\n" | |
| 112 | ,dev, unit, NUK)); | |
| 113 | /* | |
| 114 | * Catch any unit attention errors. | |
| 115 | */ | |
| 116 | return 0; | |
| 117 | } | |
| 118 | ||
| 119 | /* | |
| 120 | * close the device.. only called if we are the LAST | |
| 121 | * occurence of an open device | |
| 122 | */ | |
| 123 | errval | |
| 124 | ukclose(dev) | |
| 4c45483e | 125 | dev_t dev; |
| 519fb2b7 | 126 | { |
| 4c45483e | 127 | unsigned char unit = 0, mode; /* XXX !!! XXX FIXME!!! 0??? */ |
| 519fb2b7 RG |
128 | struct scsi_link *sc_link; |
| 129 | ||
| 130 | sc_link = uk_data[unit].sc_link; | |
| 131 | ||
| 132 | SC_DEBUG(sc_link, SDEV_DB1, ("Closing device")); | |
| 133 | sc_link->flags &= ~SDEV_OPEN; | |
| 134 | return (0); | |
| 135 | } | |
| 136 | ||
| 137 | /* | |
| 138 | * Perform special action on behalf of the user | |
| 139 | * Only does generic scsi ioctls. | |
| 140 | */ | |
| 141 | errval | |
| 142 | ukioctl(dev, cmd, arg, mode) | |
| 143 | dev_t dev; | |
| 144 | u_int32 cmd; | |
| 145 | caddr_t arg; | |
| 4c45483e | 146 | int mode; |
| 519fb2b7 RG |
147 | { |
| 148 | unsigned char unit; | |
| 149 | struct scsi_link *sc_link; | |
| 150 | ||
| 151 | /* | |
| 152 | * Find the device that the user is talking about | |
| 153 | */ | |
| 154 | unit = minor(dev); | |
| 155 | sc_link = uk_data[unit].sc_link; | |
| 156 | return(scsi_do_ioctl(sc_link,cmd,arg,mode)); | |
| 157 | } | |
| 158 |