Add the smallest and least useful device-driver by a fair margin...

1 files changed, 121 insertions, 0 deletions

diff --git a/sys/i386/isa/loran.c b/sys/i386/isa/loran.c
new file mode 100644
index 0000000..7d524e1
--- /dev/null
+++ b/sys/i386/isa/loran.c
@@ -0,0 +1,121 @@
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
+ * ----------------------------------------------------------------------------
+ *
+ * $Id$
+ *
+ * This device-driver helps the userland controlprogram for a LORAN-C
+ * receiver avoid monopolizing the CPU.
+ *
+ * This is clearly a candidate for the "most weird hardware support in
+ * FreeBSD" prize.  At this time only two copies of the receiver are
+ * known to exist in the entire world.
+ *
+ * Details can be found at:
+ *     ftp://ftp.eecis.udel.edu/pub/ntp/loran.tar.Z
+ *
+ */
+
+#include "loran.h"
+#include "opt_devfs.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/buf.h>
+#include <sys/kernel.h>
+#include <sys/uio.h>
+#include <sys/syslog.h>
+#ifdef DEVFS
+#include <sys/devfsext.h>
+#endif /*DEVFS*/
+
+#include <i386/isa/isa.h>
+#include <i386/isa/isa_device.h>
+
+static int	loranprobe (struct isa_device *dvp);
+static int	loranattach (struct isa_device *isdp);
+
+struct	isa_driver lorandriver = {
+	loranprobe, loranattach, "loran"
+};
+
+struct timespec loran_token;
+
+static	d_open_t	loranopen;
+static	d_close_t	loranclose;
+static	d_read_t	loranread;
+
+#define CDEV_MAJOR 94
+static struct cdevsw loran_cdevsw = 
+	{ loranopen,	loranclose,	loranread,	nowrite,
+	  noioctl,	nullstop,	nullreset,	nodevtotty,
+	  seltrue,	nommap,		nostrat,	"loran",
+	  NULL,		-1 };
+
+
+int
+loranprobe(struct isa_device *dvp)
+{
+	dvp->id_iobase = 0x300;
+	return (8);
+}
+
+int
+loranattach(struct isa_device *isdp)
+{
+	printf("loran0: LORAN-C Receiver\n");
+	return (1);
+}
+
+static	int
+loranopen (dev_t dev, int flags, int fmt, struct proc *p)
+{
+
+	return(0);
+}
+
+static	int
+loranclose(dev_t dev, int flags, int fmt, struct proc *p)
+{
+	
+	return(0);
+}
+
+static	int
+loranread(dev_t dev, struct uio * uio, int ioflag)
+{
+        int err, c;
+
+	tsleep ((caddr_t)&loran_token, PZERO + 8 |PCATCH, "loranrd", hz*10);
+        c = imin(uio->uio_resid, (int)sizeof loran_token);
+        err = uiomove((caddr_t)&loran_token, c, uio);        
+	return(err);
+}
+
+void
+loranintr(int unit)
+{
+	nanotime(&loran_token);
+	wakeup((caddr_t)&loran_token);
+}
+
+static loran_devsw_installed = 0;
+
+static void 	loran_drvinit(void *unused)
+{
+	dev_t dev;
+
+	if( ! loran_devsw_installed ) {
+		dev = makedev(CDEV_MAJOR, 0);
+		cdevsw_add(&dev,&loran_cdevsw, NULL);
+		loran_devsw_installed = 1;
+    	}
+}
+
+SYSINIT(lorandev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,loran_drvinit,NULL)
+