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122 lines
2.6 KiB
C
122 lines
2.6 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $Id$
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*
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* This device-driver helps the userland controlprogram for a LORAN-C
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* receiver avoid monopolizing the CPU.
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*
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* This is clearly a candidate for the "most weird hardware support in
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* FreeBSD" prize. At this time only two copies of the receiver are
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* known to exist in the entire world.
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*
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* Details can be found at:
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* ftp://ftp.eecis.udel.edu/pub/ntp/loran.tar.Z
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*
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*/
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#include "loran.h"
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#include "opt_devfs.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/buf.h>
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#include <sys/kernel.h>
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#include <sys/uio.h>
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#include <sys/syslog.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 <i386/isa/isa.h>
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#include <i386/isa/isa_device.h>
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static int loranprobe (struct isa_device *dvp);
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static int loranattach (struct isa_device *isdp);
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struct isa_driver lorandriver = {
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loranprobe, loranattach, "loran"
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};
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struct timespec loran_token;
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static d_open_t loranopen;
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static d_close_t loranclose;
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static d_read_t loranread;
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#define CDEV_MAJOR 94
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static struct cdevsw loran_cdevsw =
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{ loranopen, loranclose, loranread, nowrite,
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noioctl, nullstop, nullreset, nodevtotty,
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seltrue, nommap, nostrat, "loran",
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NULL, -1 };
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int
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loranprobe(struct isa_device *dvp)
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{
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dvp->id_iobase = 0x300;
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return (8);
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}
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int
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loranattach(struct isa_device *isdp)
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{
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printf("loran0: LORAN-C Receiver\n");
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return (1);
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}
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static int
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loranopen (dev_t dev, int flags, int fmt, struct proc *p)
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{
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return(0);
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}
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static int
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loranclose(dev_t dev, int flags, int fmt, struct proc *p)
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{
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return(0);
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}
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static int
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loranread(dev_t dev, struct uio * uio, int ioflag)
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{
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int err, c;
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tsleep ((caddr_t)&loran_token, PZERO + 8 |PCATCH, "loranrd", hz*10);
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c = imin(uio->uio_resid, (int)sizeof loran_token);
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err = uiomove((caddr_t)&loran_token, c, uio);
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return(err);
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}
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void
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loranintr(int unit)
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{
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nanotime(&loran_token);
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wakeup((caddr_t)&loran_token);
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}
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static loran_devsw_installed = 0;
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static void loran_drvinit(void *unused)
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{
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dev_t dev;
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if( ! loran_devsw_installed ) {
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dev = makedev(CDEV_MAJOR, 0);
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cdevsw_add(&dev,&loran_cdevsw, NULL);
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loran_devsw_installed = 1;
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}
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}
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SYSINIT(lorandev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,loran_drvinit,NULL)
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