freebsd-dev/sys/dev/ppbus/ppi.c
Mike Smith 6f34dba98a Actually implement the internals of the 'ppi' device.
It is now possible to control the various parallel port signals from
user-space programs without having to resort to opening /dev/io
directly.
1998-01-02 09:30:39 +00:00

281 lines
6.1 KiB
C

/*-
* Copyright (c) 1997, 1998 Nicolas Souchu, Michael Smith
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: ppi.c,v 1.5 1997/09/01 00:51:49 bde Exp $
*
*/
#include "ppi.h"
#if NPPI > 0
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/fcntl.h>
#include <dev/ppbus/ppbconf.h>
#include <dev/ppbus/ppi.h>
struct ppi_data {
int ppi_unit;
int ppi_flags;
#define HAVE_PPBUS (1<<0)
struct ppb_device ppi_dev;
};
#define MAXPPI 8 /* XXX not much better! */
static int nppi = 0;
static struct ppi_data *ppidata[MAXPPI];
/*
* Make ourselves visible as a ppbus driver
*/
static struct ppb_device *ppiprobe(struct ppb_data *ppb);
static int ppiattach(struct ppb_device *dev);
static void ppiintr(int unit);
static struct ppb_driver ppidriver = {
ppiprobe, ppiattach, "ppi"
};
DATA_SET(ppbdriver_set, ppidriver);
static d_open_t ppiopen;
static d_close_t ppiclose;
static d_ioctl_t ppiioctl;
#define CDEV_MAJOR 82
static struct cdevsw ppi_cdevsw =
{ ppiopen, ppiclose, noread, nowrite, /* 82 */
ppiioctl, nullstop, nullreset, nodevtotty,
seltrue, nommap, nostrat, "ppi", NULL, -1 };
/*
* ppiprobe()
*/
static struct ppb_device *
ppiprobe(struct ppb_data *ppb)
{
struct ppi_data *ppi;
ppi = (struct ppi_data *) malloc(sizeof(struct ppi_data),
M_TEMP, M_NOWAIT);
if (!ppi) {
printf("ppi: cannot malloc!\n");
return 0;
}
bzero(ppi, sizeof(struct ppi_data));
ppidata[nppi] = ppi;
/*
* ppi dependent initialisation.
*/
ppi->ppi_unit = nppi;
/*
* ppbus dependent initialisation.
*/
ppi->ppi_dev.id_unit = ppi->ppi_unit;
ppi->ppi_dev.ppb = ppb;
ppi->ppi_dev.intr = ppiintr;
/* Ok, go to next device on next probe */
nppi ++;
return &ppi->ppi_dev;
}
static int
ppiattach(struct ppb_device *dev)
{
struct ppi_data *ppi = ppidata[dev->id_unit];
/*
* Report ourselves
*/
printf("ppi%d: <generic parallel i/o> on ppbus %d\n",
dev->id_unit, dev->ppb->ppb_link->adapter_unit);
return (1);
}
static void
ppiintr(int unit)
{
return;
}
static int
ppiopen(dev_t dev, int flags, int fmt, struct proc *p)
{
u_int unit = minor(dev);
struct ppi_data *ppi = ppidata[unit];
int res;
if (unit >= nppi)
return (ENXIO);
if (!(ppi->ppi_flags & HAVE_PPBUS))
if ((res = ppb_request_bus(&ppi->ppi_dev, (flags & O_NONBLOCK) ? PPB_DONTWAIT : (PPB_WAIT | PPB_INTR))))
return (res);
ppi->ppi_flags |= HAVE_PPBUS;
return (0);
}
static int
ppiclose(dev_t dev, int flags, int fmt, struct proc *p)
{
u_int unit = minor(dev);
struct ppi_data *ppi = ppidata[unit];
if (ppi->ppi_flags & HAVE_PPBUS)
ppb_release_bus(&ppi->ppi_dev);
ppi->ppi_flags &= ~HAVE_PPBUS;
return (0);
}
static int
ppiioctl(dev_t dev, int cmd, caddr_t data, int flags, struct proc *p)
{
u_int unit = minor(dev);
struct ppi_data *ppi = ppidata[unit];
int error = 0;
u_int8_t *val = (u_int8_t *)data;
switch (cmd) {
case PPIGDATA: /* get data register */
*val = ppb_rdtr(&ppi->ppi_dev);
break;
case PPIGSTATUS: /* get status bits */
*val = ppb_rstr(&ppi->ppi_dev);
break;
case PPIGCTRL: /* get control bits */
*val = ppb_rctr(&ppi->ppi_dev);
break;
case PPIGEPP: /* get EPP bits */
*val = ppb_repp(&ppi->ppi_dev);
break;
case PPIGECR: /* get ECP bits */
*val = ppb_recr(&ppi->ppi_dev);
break;
case PPIGFIFO: /* read FIFO */
*val = ppb_rfifo(&ppi->ppi_dev);
break;
case PPISDATA: /* set data register */
ppb_wdtr(&ppi->ppi_dev, *val);
break;
case PPISSTATUS: /* set status bits */
ppb_wstr(&ppi->ppi_dev, *val);
break;
case PPISCTRL: /* set control bits */
ppb_wctr(&ppi->ppi_dev, *val);
break;
case PPISEPP: /* set EPP bits */
ppb_wepp(&ppi->ppi_dev, *val);
break;
case PPISECR: /* set ECP bits */
ppb_wecr(&ppi->ppi_dev, *val);
break;
case PPISFIFO: /* write FIFO */
ppb_wfifo(&ppi->ppi_dev, *val);
break;
default:
error = ENOTTY;
break;
}
return (error);
}
#ifdef PPI_MODULE
MOD_DEV(ppi, LM_DT_CHAR, CDEV_MAJOR, &ppi_cdevsw);
static int
ppi_load(struct lkm_table *lkmtp, int cmd)
{
struct ppb_data *ppb;
struct ppb_device *dev;
int i;
for (ppb = ppb_next_bus(NULL); ppb; ppb = ppb_next_bus(ppb)) {
dev = ppiprobe(ppb);
ppiattach(dev);
ppb_attach_device(dev);
}
return (0);
}
static int
ppi_unload(struct lkm_table *lkmtp, int cmd)
{
int i;
for (i = nppi-1; i > 0; i--) {
ppb_remove_device(&ppidata[i]->ppi_dev);
free(ppidata[i], M_TEMP);
}
return (0);
}
int
ppi_mod(struct lkm_table *lkmtp, int cmd, int ver)
{
DISPATCH(lkmtp, cmd, ver, ppi_load, ppi_unload, lkm_nullcmd);
}
#endif /* PPI_MODULE */
static ppi_devsw_installed = 0;
static void ppi_drvinit(void *unused)
{
dev_t dev;
if (!ppi_devsw_installed ) {
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev, &ppi_cdevsw, NULL);
ppi_devsw_installed = 1;
}
}
SYSINIT(ppidev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ppi_drvinit,NULL)
#endif /* NPPI */