sys/dev/misc/spigot/spigot.c

   1 /*
   2  * Video spigot capture driver.
   3  *
   4  * Copyright (c) 1995, Jim Lowe.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are
   8  * met: 1. Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer. 2.
  10  * Redistributions in binary form must reproduce the above copyright notice,
  11  * this list of conditions and the following disclaimer in the documentation
  12  * and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  17  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  18  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  20  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  21  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * This is the minimum driver code required to make a spigot work.
  27  * Unfortunatly, I can't include a real driver since the information
  28  * on the spigot is under non-disclosure.  You can pick up a library
  29  * that will work with this driver from
  30  * ftp://ftp.cs.uwm.edu/pub/FreeBSD-UWM.  The library contains the
  31  * source that I can release as well as several object modules and
  32  * functions that allows one to read spigot data.  See the code for
  33  * spigot_grab.c that is included with the library data.
  34  *
  35  * The vendor will not allow me to release the spigot library code.
  36  * Please don't ask me for it.
  37  *
  38  * To use this driver you will need the spigot library.  The library is
  39  * available from:
  40  *
  41  *      ftp.cs.uwm.edu://pub/FreeBSD-UWM/spigot/spigot.tar.gz
  42  *
  43  * Version 1.7, December 1995.
  44  *
  45  * $FreeBSD: src/sys/i386/isa/spigot.c,v 1.44 2000/01/29 16:17:36 peter Exp $
  46  * $DragonFly: src/sys/dev/misc/spigot/spigot.c,v 1.16 2008/08/02 01:14:42 dillon Exp $
  47  *
  48  */
  49
  50 #include        "use_spigot.h"
  51
  52 #if NSPIGOT > 1
  53 error "Can only have 1 spigot configured."
  54 #endif
  55
  56 #include        "opt_spigot.h"
  57
  58 #include        <sys/param.h>
  59 #include        <sys/systm.h>
  60 #include        <sys/conf.h>
  61 #include        <sys/device.h>
  62 #include        <sys/proc.h>
  63 #include        <sys/priv.h>
  64 #include        <sys/signalvar.h>
  65 #include        <sys/mman.h>
  66
  67 #include        <machine/frame.h>
  68 #include        <machine/md_var.h>
  69 #include        <machine/spigot.h>
  70 #include        <machine/psl.h>
  71
  72 #include        <bus/isa/isa_device.h>
  73
  74 static struct spigot_softc {
  75         u_long          flags;
  76         u_long          maddr;
  77         struct proc     *p;
  78         u_long          signal_num;
  79         u_short         irq;
  80 } spigot_softc[NSPIGOT];
  81
  82 /* flags in softc */
  83 #define OPEN            0x01
  84 #define ALIVE           0x02
  85
  86 #define UNIT(dev) minor(dev)
  87
  88 static int      spigot_probe(struct isa_device *id);
  89 static int      spigot_attach(struct isa_device *id);
  90
  91 struct isa_driver       spigotdriver = {spigot_probe, spigot_attach, "spigot"};
  92
  93 static  d_open_t        spigot_open;
  94 static  d_close_t       spigot_close;
  95 static  d_read_t        spigot_read;
  96 static  d_write_t       spigot_write;
  97 static  d_ioctl_t       spigot_ioctl;
  98 static  d_mmap_t        spigot_mmap;
  99
 100 #define CDEV_MAJOR 11
 101 static struct dev_ops spigot_ops = {
 102         { "spigot", CDEV_MAJOR, 0 },
 103         .d_open =       spigot_open,
 104         .d_close =      spigot_close,
 105         .d_read =       spigot_read,
 106         .d_write =      spigot_write,
 107         .d_ioctl =      spigot_ioctl,
 108         .d_mmap =       spigot_mmap,
 109 };
 110
 111 static void     spigintr(void *);
 112
 113 static int
 114 spigot_probe(struct isa_device *devp)
 115 {
 116         struct spigot_softc *ss;
 117         int status;
 118
 119         ss = (struct spigot_softc *)&spigot_softc[devp->id_unit];
 120         ss->flags = 0;
 121         ss->maddr = 0;
 122         ss->irq = 0;
 123
 124         if(devp->id_iobase != 0xad6 || inb(0xad9) == 0xff)
 125                 status = 0;     /* not found */
 126         else {
 127                 status = 1;     /* found */
 128                 ss->flags |= ALIVE;
 129         }
 130
 131         return(status);
 132 }
 133
 134 static int
 135 spigot_attach(struct isa_device *devp)
 136 {
 137         int     unit;
 138         struct  spigot_softc    *ss= &spigot_softc[unit = devp->id_unit];
 139
 140         devp->id_intr = (inthand2_t *)spigintr;
 141         ss->maddr = kvtop(devp->id_maddr);
 142         ss->irq = devp->id_irq;
 143         dev_ops_add(&spigot_ops, -1, unit);
 144         make_dev(&spigot_ops, unit, 0, 0, 0644, "spigot%d", unit);
 145         return 1;
 146 }
 147
 148 static  int
 149 spigot_open(struct dev_open_args *ap)
 150 {
 151         cdev_t dev = ap->a_head.a_dev;
 152         int error;
 153         struct spigot_softc *ss;
 154
 155         ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
 156
 157         if((ss->flags & ALIVE) == 0)
 158                 return ENXIO;
 159
 160         if(ss->flags & OPEN)
 161                 return EBUSY;
 162
 163 #if !defined(SPIGOT_UNSECURE)
 164         /*
 165          * Don't allow open() unless the process has sufficient privileges,
 166          * since mapping the i/o page and granting i/o privilege would
 167          * require sufficient privilege soon and nothing much can be done
 168          * without them.
 169          */
 170         error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0);
 171         if (error != 0)
 172                 return error;
 173         if (securelevel > 0)
 174                 return EPERM;
 175 #endif
 176
 177         ss->flags |= OPEN;
 178         ss->p = 0;
 179         ss->signal_num = 0;
 180
 181         return 0;
 182 }
 183
 184 static  int
 185 spigot_close(struct dev_close_args *ap)
 186 {
 187         cdev_t dev = ap->a_head.a_dev;
 188         struct spigot_softc *ss;
 189
 190         ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
 191         ss->flags &= ~OPEN;
 192         ss->p = 0;
 193         ss->signal_num = 0;
 194
 195         outb(0xad6, 0);
 196
 197         return 0;
 198 }
 199
 200 static  int
 201 spigot_write(struct dev_write_args *ap)
 202 {
 203         return ENXIO;
 204 }
 205
 206 static  int
 207 spigot_read(struct dev_read_args *ap)
 208 {
 209         return ENXIO;
 210 }
 211
 212
 213 static  int
 214 spigot_ioctl(struct dev_ioctl_args *ap)
 215 {
 216         cdev_t dev = ap->a_head.a_dev;
 217         caddr_t data = ap->a_data;
 218         int error;
 219         struct spigot_softc *ss;
 220         struct spigot_info *info;
 221
 222         ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
 223         if (data == NULL)
 224                 return(EINVAL);
 225
 226         switch(ap->a_cmd){
 227         case    SPIGOT_SETINT:
 228                 if (*(int *)data < 0 || *(int *)data > _SIG_MAXSIG)
 229                         return (EINVAL);
 230                 ss->p = curproc;
 231                 ss->signal_num = *((int *)data);
 232                 break;
 233         case    SPIGOT_IOPL_ON: /* allow access to the IO PAGE */
 234 #if !defined(SPIGOT_UNSECURE)
 235                 error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0);
 236                 if (error != 0)
 237                         return error;
 238                 if (securelevel > 0)
 239                         return EPERM;
 240 #endif
 241                 curthread->td_lwp->lwp_md.md_regs->tf_eflags |= PSL_IOPL;
 242                 break;
 243         case    SPIGOT_IOPL_OFF: /* deny access to the IO PAGE */
 244                 curthread->td_lwp->lwp_md.md_regs->tf_eflags &= ~PSL_IOPL;
 245                 break;
 246         case    SPIGOT_GET_INFO:
 247                 info = (struct spigot_info *)data;
 248                 info->maddr  = ss->maddr;
 249                 info->irq = ss->irq;
 250                 break;
 251         default:
 252                 return ENOTTY;
 253         }
 254
 255         return 0;
 256 }
 257
 258 /*
 259  * Interrupt procedure.
 260  * Just call a user level interrupt routine.
 261  */
 262 static void
 263 spigintr(void *arg)
 264 {
 265         int unit = (int)arg;
 266         struct spigot_softc *ss;
 267
 268         ss = (struct spigot_softc *)&spigot_softc[unit];
 269         if(ss->p && ss->signal_num)
 270                 ksignal(ss->p, ss->signal_num);
 271 }
 272
 273 static  int
 274 spigot_mmap(struct dev_mmap_args *ap)
 275 {
 276         struct spigot_softc *ss;
 277
 278         ss = (struct spigot_softc *)&spigot_softc[0];
 279         if (ap->a_offset != 0)
 280                 return EINVAL;
 281         if (ap->a_nprot & PROT_EXEC)
 282                 return EINVAL;
 283         ap->a_result = i386_btop(ss->maddr);
 284         return(0);
 285 }