freebsd/share/examples/drivers/make_pseudo_driver.sh

#!/bin/sh
# This writes a skeleton driver and puts it into the kernel tree for you
#arg1 is lowercase "foo"
#
# Trust me, RUN THIS SCRIPT :)
#
# $FreeBSD$
#
#-------cut here------------------
cd /sys/i386/conf

if [ "${1}X" = "X" ]
then
	echo "Hey , how about some help here.. give me a device name!"
	exit 1
fi

UPPER=`echo ${1} |tr "[:lower:]" "[:upper:]"`
cat >files.${UPPER} <<DONE
dev/${1}.c      optional ${1} device-driver
DONE

cat >${UPPER} <<DONE
# Configuration file for kernel type: ${UPPER}
ident	${UPPER}
# \$FreeBSD\$
DONE

grep -v GENERIC < GENERIC >>${UPPER}

cat >>${UPPER} <<DONE
# trust me, you'll need this
options	DDB
device	${1}
DONE

cat >../../dev/${1}.c <<DONE
/*
 * Copyright ME
 *
 * ${1} driver
 */

#include <sys/cdefs.h>
__FBSDID("\$FreeBSD\$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>		/* SYSINIT stuff */
#include <sys/conf.h>		/* cdevsw stuff */
#include <sys/devfsext.h>	/* DEVFS definitions */
#include <sys/malloc.h>		/* malloc region definitions */
#include <sys/proc.h>
#include <sys/${1}io.h>		/* ${1} IOCTL definitions */

#include <machine/clock.h>	/* DELAY() */

#include "${1}.h"		/* generated file.. defines N${UPPER} */

/* Function prototypes (these should all be static) */
static  d_open_t	${1}open;
static  d_close_t	${1}close;
static  d_read_t	${1}read;
static  d_write_t	${1}write;
static  d_ioctl_t	${1}ioctl;
static  d_mmap_t	${1}mmap;
static  d_poll_t	${1}poll;

#define CDEV_MAJOR 20
static struct cdevsw ${1}_cdevsw = {
	${1}open,
	${1}close,
	${1}read,
	${1}write,
	${1}ioctl,
	nullstop,
	nullreset,
	nodevtotty,
	${1}poll,
	${1}mmap,
	NULL,
	"${1}",
	NULL,
	-1
};

/*
 * device  specific Misc defines
 */
#define BUFFERSIZE 1024
#define UNIT(dev) minor(dev)	/* assume one minor number per unit */

/*
 * One of these per allocated device
 */
struct ${1}_softc {
	struct isa_device *dev;
	char	buffer[BUFFERSIZE];
	static void *devfs_token;
};

typedef	struct ${1}_softc *sc_p;

static sc_p sca[N${UPPER}];

/*
 * Macro to check that the unit number is valid
 * Often this isn't needed as once the open() is performed,
 * the unit number is pretty much safe.. The exception would be if we
 * implemented devices that could "go away". in which case all these routines
 * would be wise to check the number, DIAGNOSTIC or not.
 */
#define CHECKUNIT(RETVAL)						\
do { /* the do-while is a safe way to do this grouping */		\
	if (unit > N${UPPER}) {						\
		printf("%s: bad unit %d\n", __func__, unit);		\
		return (RETVAL);					\
	}								\
	if (scp == NULL) { 						\
		printf("%s: unit %d not attached\n", __func__, unit);	\
		return (RETVAL);					\
	}								\
} while (0)

#ifdef	DIAGNOSTIC
#define	CHECKUNIT_DIAG(RETVAL) CHECKUNIT(RETVAL)
#else	/* DIAGNOSTIC */
#define	CHECKUNIT_DIAG(RETVAL)
#endif 	/* DIAGNOSTIC */

static int
${1}ioctl (dev_t dev, int cmd, caddr_t data, int flag, struct thread *td)
{
	int unit = UNIT(dev);
	sc_p scp  = sca[unit];

	CHECKUNIT_DIAG(ENXIO);

	switch (cmd) {
	    case DHIOCRESET:
		/*  whatever resets it */
		outb(scp->dev->id_iobase, 0xff);
		break;
	    default:
		return ENXIO;
	}
	return (0);
}

/*
 * You also need read, write, open, close routines.
 * This should get you started
 */
static int
${1}open(dev_t dev, int oflags, int devtype, struct thread *td)
{
	int unit = UNIT(dev);
	sc_p scp  = sca[unit];

	CHECKUNIT(ENXIO);

	/*
	 * Do processing
	 */
	return (0);
}

static int
${1}close(dev_t dev, int fflag, int devtype, struct thread *td)
{
	int unit = UNIT(dev);
	sc_p scp  = sca[unit];

	CHECKUNIT_DIAG(ENXIO);

	/*
	 * Do processing
	 */
	return (0);
}

static int
${1}read(dev_t dev, struct uio *uio, int ioflag)
{
	int unit = UNIT(dev);
	sc_p scp  = sca[unit];
	int     toread;


	CHECKUNIT_DIAG(ENXIO);

	/*
	 * Do processing
	 * read from buffer
	 */
	toread = (min(uio->uio_resid, sizeof(scp->buffer)));
	return(uiomove(scp->buffer, toread, uio));
}

static int
${1}write(dev_t dev, struct uio *uio, int ioflag)
{
	int unit = UNIT(dev);
	sc_p scp  = sca[unit];
	int	towrite;

	CHECKUNIT_DIAG(ENXIO);

	/*
	 * Do processing
	 * write to buffer
	 */
	towrite = (min(uio->uio_resid, sizeof(scp->buffer)));
	return(uiomove(scp->buffer, towrite, uio));
}

static int
${1}mmap(dev_t dev, int offset, int nprot)
{
	int unit = UNIT(dev);
	sc_p scp  = sca[unit];

	CHECKUNIT_DIAG(-1);

	/*
	 * Do processing
	 */
#if 0	/* if we had a frame buffer or whatever.. do this */
	if (offset > FRAMEBUFFERSIZE - PAGE_SIZE) {
		return (-1);
	}
	return i386_btop((FRAMEBASE + offset));
#else
	return (-1);
#endif
}

static int
${1}poll(dev_t dev, int which, struct thread *td)
{
	int unit = UNIT(dev);
	sc_p scp  = sca[unit];

	CHECKUNIT_DIAG(ENXIO);

	/*
	 * Do processing
	 */
	return (0); /* this is the wrong value I'm sure */
}

/*
 * Now  for some driver initialisation.
 * Occurs ONCE during boot (very early).
 */
static void
${1}_drvinit(void *unused)
{
        dev_t dev;
	int	unit;
	sc_p scp  = sca[unit];

	dev = makedev(CDEV_MAJOR, 0);
	cdevsw_add(&dev, &${1}_cdevsw, NULL);
	for (unit = 0; unit < N${UPPER}; unit++) {
		/*
		 * Allocate storage for this instance .
		 */
		scp = malloc(sizeof(*scp), M_DEVBUF, M_NOWAIT | M_ZERO);
		if( scp == NULL) {
			printf("${1}%d failed to allocate strorage\n", unit);
			return;
		}
		sca[unit] = scp;
    		scp->devfs_token = devfs_add_devswf(&${1}_cdevsw, unit, DV_CHR,
	    		UID_ROOT, GID_KMEM, 0640, "${1}%d", unit);
	}
}

SYSINIT(${1}dev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR,
		${1}_drvinit, NULL)
DONE

cat >../../sys/${1}io.h <<DONE
/*
 * Definitions needed to access the ${1} device (ioctls etc)
 * see mtio.h , ioctl.h as examples
 */
#ifndef SYS_DHIO_H
#define SYS_DHIO_H

#ifndef KERNEL
#include <sys/types.h>
#endif
#include <sys/ioccom.h>

/*
 * define an ioctl here
 */
#define DHIOCRESET _IO('D', 0)   /* reset the ${1} device */
#endif
DONE

config ${UPPER}
cd ../../compile/${UPPER}
make depend
make ${1}.o
make
exit

#--------------end of script---------------
#
#you also need to add an entry into the cdevsw[]
#array in conf.c, but it's too hard to do in a script..
#
#edit to your taste..
#
#