| 1 | /* |
| 2 | * Dummy driver for a device we can't identify. |
| 3 | * by Julian Elischer (julian@tfs.com) |
| 4 | * |
| 5 | * $Id: uk.c,v 1.2 1993/11/25 01:37:35 wollman Exp $ |
| 6 | */ |
| 7 | |
| 8 | #include <sys/param.h> |
| 9 | #include "systm.h" |
| 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 | |
| 70 | return 1; /* XXX ??? */ |
| 71 | |
| 72 | } |
| 73 | |
| 74 | /* |
| 75 | * open the device. |
| 76 | */ |
| 77 | errval |
| 78 | ukopen(dev) |
| 79 | dev_t dev; |
| 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) |
| 125 | dev_t dev; |
| 126 | { |
| 127 | unsigned char unit = 0, mode; /* XXX !!! XXX FIXME!!! 0??? */ |
| 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; |
| 146 | int mode; |
| 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 | |