301 lines
7.1 KiB
C
301 lines
7.1 KiB
C
/*
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* Video spigot capture driver.
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*
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* Copyright (c) 1995, Jim Lowe. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer. 2.
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This is the minimum driver code required to make a spigot work.
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* Unfortunatly, I can't include a real driver since the information
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* on the spigot is under non-disclosure. You can pick up a library
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* that will work with this driver from ftp://ftp.cs.uwm.edu/pub/FreeBSD.
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* The library contains the source that I can release as well as several
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* object modules and functions that allows one to read spigot data.
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* See the code for spigot_grab.c that is included with the library
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* data.
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*
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* The vendor will not allow me to release the spigot library code.
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* Please don't ask me for it.
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*
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* To use this driver you will need the spigot library. The library is
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* available from:
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*
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* ftp.cs.uwm.edu://pub/FreeBSD/spigot/spigot.tar.gz
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*
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* Version 1.7, December 1995.
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*
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*/
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#include "spigot.h"
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#if NSPIGOT > 0
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#if NSPIGOT > 1
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error "Can only have 1 spigot configured."
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/conf.h>
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#include <sys/proc.h>
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#include <sys/signalvar.h>
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#include <sys/file.h>
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#include <sys/uio.h>
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#include <sys/malloc.h>
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#include <sys/errno.h>
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#include <sys/mman.h>
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif /* DEVFS */
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#include <machine/frame.h>
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#include <machine/md_var.h>
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#include <machine/spigot.h>
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#include <machine/psl.h>
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#include <i386/isa/isa_device.h>
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static struct spigot_softc {
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u_long flags;
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u_long maddr;
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struct proc *p;
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u_long signal_num;
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u_short irq;
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#ifdef DEVFS
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void *devfs_token;
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#endif
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} spigot_softc[NSPIGOT];
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/* flags in softc */
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#define OPEN 0x01
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#define ALIVE 0x02
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#define UNIT(dev) minor(dev)
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static int spigot_probe(struct isa_device *id);
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static int spigot_attach(struct isa_device *id);
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struct isa_driver spigotdriver = {spigot_probe, spigot_attach, "spigot"};
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static d_open_t spigot_open;
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static d_close_t spigot_close;
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static d_read_t spigot_read;
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static d_write_t spigot_write;
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static d_ioctl_t spigot_ioctl;
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static d_select_t spigot_select;
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static d_mmap_t spigot_mmap;
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#define CDEV_MAJOR 11
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static struct cdevsw spigot_cdevsw =
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{ spigot_open, spigot_close, spigot_read, spigot_write, /*11*/
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spigot_ioctl, nostop, nullreset, nodevtotty,/* Spigot */
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spigot_select, spigot_mmap, NULL, "spigot", NULL, -1 };
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static int
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spigot_probe(struct isa_device *devp)
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{
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int status;
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struct spigot_softc *ss=(struct spigot_softc *)&spigot_softc[devp->id_unit];
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ss->flags = 0;
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ss->maddr = 0;
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ss->irq = 0;
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if(devp->id_iobase != 0xad6 || inb(0xad9) == 0xff)
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status = 0; /* not found */
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else {
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status = 1; /* found */
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ss->flags |= ALIVE;
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}
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return(status);
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}
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static int
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spigot_attach(struct isa_device *devp)
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{
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int unit;
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struct spigot_softc *ss= &spigot_softc[unit = devp->id_unit];
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ss->maddr = kvtop(devp->id_maddr);
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ss->irq = devp->id_irq;
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#ifdef DEVFS
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ss->devfs_token =
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devfs_add_devswf(&spigot_cdevsw, unit, DV_CHR, 0, 0, 0644,
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"spigot%d", unit);
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#endif
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return 1;
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}
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static int
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spigot_open(dev_t dev, int flags, int fmt, struct proc *p)
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{
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int error;
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struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
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if((ss->flags & ALIVE) == 0)
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return ENXIO;
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if(ss->flags & OPEN)
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return EBUSY;
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#if !defined(SPIGOT_UNSECURE)
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/*
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* Don't allow open() unless the process has sufficient privileges,
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* since mapping the i/o page and granting i/o privilege would
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* require sufficient privilege soon and nothing much can be done
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* without them.
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*/
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error = suser(p->p_ucred, &p->p_acflag);
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if (error != 0)
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return error;
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if (securelevel > 0)
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return EPERM;
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#endif
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ss->flags |= OPEN;
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ss->p = 0;
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ss->signal_num = 0;
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return 0;
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}
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static int
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spigot_close(dev_t dev, int flags, int fmt, struct proc *p)
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{
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struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
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ss->flags &= ~OPEN;
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ss->p = 0;
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ss->signal_num = 0;
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outb(0xad6, 0);
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return 0;
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}
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static int
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spigot_write(dev_t dev, struct uio *uio, int ioflag)
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{
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return ENXIO;
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}
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static int
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spigot_read(dev_t dev, struct uio *uio, int ioflag)
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{
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return ENXIO;
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}
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static int
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spigot_ioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
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{
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int error;
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struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
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struct spigot_info *info;
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if(!data) return(EINVAL);
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switch(cmd){
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case SPIGOT_SETINT:
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ss->p = p;
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ss->signal_num = *((int *)data);
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break;
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case SPIGOT_IOPL_ON: /* allow access to the IO PAGE */
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#if !defined(SPIGOT_UNSECURE)
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error = suser(p->p_ucred, &p->p_acflag);
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if (error != 0)
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return error;
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if (securelevel > 0)
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return EPERM;
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#endif
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p->p_md.md_regs->tf_eflags |= PSL_IOPL;
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break;
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case SPIGOT_IOPL_OFF: /* deny access to the IO PAGE */
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p->p_md.md_regs->tf_eflags &= ~PSL_IOPL;
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break;
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case SPIGOT_GET_INFO:
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info = (struct spigot_info *)data;
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info->maddr = ss->maddr;
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info->irq = ss->irq;
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break;
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default:
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return ENOTTY;
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}
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return 0;
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}
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static int
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spigot_select(dev_t dev, int rw, struct proc *p)
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{
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return ENXIO;
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}
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/*
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* Interrupt procedure.
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* Just call a user level interrupt routine.
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*/
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void
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spigintr(int unit)
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{
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struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[unit];
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if(ss->p && ss->signal_num)
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psignal(ss->p, ss->signal_num);
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}
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static int
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spigot_mmap(dev_t dev, int offset, int nprot)
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{
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struct spigot_softc *ss = (struct spigot_softc *)&spigot_softc[0];
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if(offset != 0) {
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printf("spigot mmap failed, offset = 0x%x != 0x0\n", offset);
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return -1;
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}
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if(nprot & PROT_EXEC)
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return -1;
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return i386_btop(ss->maddr);
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}
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static spigot_devsw_installed = 0;
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static void spigot_drvinit(void *unused)
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{
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dev_t dev;
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if( ! spigot_devsw_installed ) {
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dev = makedev(CDEV_MAJOR, 0);
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cdevsw_add(&dev,&spigot_cdevsw, NULL);
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spigot_devsw_installed = 1;
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}
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}
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SYSINIT(spigotdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,spigot_drvinit,NULL)
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#endif /* NSPIGOT */
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