294 lines
6.9 KiB
C
294 lines
6.9 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
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* ftp://ftp.cs.uwm.edu/pub/FreeBSD-UWM. The library contains the
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* source that I can release as well as several object modules and
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* functions that allows one to read spigot data. See the code for
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* spigot_grab.c that is included with the library 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-UWM/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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* $FreeBSD$
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*
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*/
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#include "spigot.h"
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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 "opt_spigot.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mman.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/signalvar.h>
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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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} 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 = {
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INTR_TYPE_MISC,
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spigot_probe,
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spigot_attach,
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"spigot"
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};
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COMPAT_ISA_DRIVER(spigot, spigotdriver);
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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_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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/* open */ spigot_open,
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/* close */ spigot_close,
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/* read */ spigot_read,
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/* write */ spigot_write,
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/* ioctl */ spigot_ioctl,
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/* poll */ nopoll,
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/* mmap */ spigot_mmap,
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/* strategy */ nostrategy,
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/* name */ "spigot",
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/* maj */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ 0,
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};
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static ointhand2_t spigintr;
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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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static int once;
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if (!once++)
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cdevsw_add(&spigot_cdevsw);
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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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devp->id_ointr = spigintr;
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ss->maddr = kvtop(devp->id_maddr);
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ss->irq = devp->id_irq;
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make_dev(&spigot_cdevsw, unit, 0, 0, 0644, "spigot%d", unit);
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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 thread *td)
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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_td(td);
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if (error != 0)
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return error;
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error = securelevel_gt(td->td_proc->p_ucred, 0);
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if (error != 0)
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return error;
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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 thread *td)
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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, u_long cmd, caddr_t data, int flag, struct thread *td)
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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 = td->td_proc;
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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_td(td);
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if (error != 0)
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return error;
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error = securelevel_gt(td->td_proc->p_ucred, 0);
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if (error)
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return error;
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#endif
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td->td_frame->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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td->td_frame->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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/*
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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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static 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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PROC_LOCK(ss->p);
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psignal(ss->p, ss->signal_num);
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PROC_UNLOCK(ss->p);
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}
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}
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static int
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spigot_mmap(dev_t dev, vm_offset_t 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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