freebsd-dev/sys/dev/ppbus/pps.c
Eivind Eklund 64714b23cd Delete apparently unused DEVFS control device creation code - code
didn't even compile.  A (now seemingly correct) devfs node is still
created.
1998-02-16 23:51:00 +00:00

212 lines
4.2 KiB
C

/*
* ----------------------------------------------------------------------------
* "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: pps.c,v 1.3 1998/02/15 14:54:09 phk Exp $
*
*/
#include "opt_devfs.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/uio.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif
#include <sys/malloc.h>
#include <dev/ppbus/ppbconf.h>
#include "pps.h"
#define PPS_NAME "pps" /* our official name */
static struct pps_data {
int pps_unit;
struct ppb_device pps_dev;
struct ppsclockev {
struct timespec timestamp;
u_int serial;
} ev;
int sawtooth;
} *softc[NPPS];
static int npps;
/*
* Make ourselves visible as a ppbus driver
*/
static struct ppb_device *ppsprobe(struct ppb_data *ppb);
static int ppsattach(struct ppb_device *dev);
static void ppsintr(int unit);
static void pps_drvinit(void *unused);
static struct ppb_driver ppsdriver = {
ppsprobe, ppsattach, PPS_NAME
};
DATA_SET(ppbdriver_set, ppsdriver);
static d_open_t ppsopen;
static d_close_t ppsclose;
static d_read_t ppsread;
static d_write_t ppswrite;
#define CDEV_MAJOR 89
static struct cdevsw pps_cdevsw =
{ ppsopen, ppsclose, ppsread, ppswrite,
noioctl, nullstop, nullreset, nodevtotty,
seltrue, nommap, nostrat, PPS_NAME,
NULL, -1 };
static struct ppb_device *
ppsprobe(struct ppb_data *ppb)
{
struct pps_data *sc;
sc = (struct pps_data *) malloc(sizeof(struct pps_data),
M_TEMP, M_NOWAIT);
if (!sc) {
printf(PPS_NAME ": cannot malloc!\n");
return (0);
}
bzero(sc, sizeof(struct pps_data));
softc[npps] = sc;
sc->pps_unit = npps++;
sc->pps_dev.id_unit = sc->pps_unit;
sc->pps_dev.ppb = ppb;
sc->pps_dev.intr = ppsintr;
return (&sc->pps_dev);
}
static int
ppsattach(struct ppb_device *dev)
{
/*
* Report ourselves
*/
printf(PPS_NAME "%d: <Pulse per second Timing Interface> on ppbus %d\n",
dev->id_unit, dev->ppb->ppb_link->adapter_unit);
#ifdef DEVFS
devfs_add_devswf(&pps_cdevsw,
dev->id_unit, DV_CHR,
UID_ROOT, GID_WHEEL, 0600, PPS_NAME "%d", dev->id_unit);
#endif
return (1);
}
static int
ppsopen(dev_t dev, int flags, int fmt, struct proc *p)
{
struct pps_data *sc;
u_int unit = minor(dev);
if ((unit >= npps))
return (ENXIO);
sc = softc[unit];
if (ppb_request_bus(&sc->pps_dev, PPB_WAIT|PPB_INTR))
return (EINTR);
ppb_wctr(&sc->pps_dev, 0x10);
return(0);
}
static int
ppsclose(dev_t dev, int flags, int fmt, struct proc *p)
{
struct pps_data *sc = softc[minor(dev)];
ppb_release_bus(&sc->pps_dev);
return(0);
}
static void
ppsintr(int unit)
{
/*
* XXX: You want to thing carefully about what you actually want to do
* here.
*/
#if 1
struct pps_data *sc = softc[unit];
struct timespec tc;
#if 1
struct timeval tv;
#endif
nanotime(&tc);
if (!(ppb_rstr(&sc->pps_dev) & nACK))
return;
tc.tv_nsec -= sc->sawtooth;
sc->sawtooth = 0;
if (tc.tv_nsec > 1000000000) {
tc.tv_sec++;
tc.tv_nsec -= 1000000000;
} else if (tc.tv_nsec < 0) {
tc.tv_sec--;
tc.tv_nsec += 1000000000;
}
sc->ev.timestamp = tc;
sc->ev.serial++;
#if 1
tv.tv_sec = tc.tv_sec;
tv.tv_usec = tc.tv_nsec / 1000;
hardpps(&tv, tv.tv_usec);
#endif
#endif
}
static int
ppsread(dev_t dev, struct uio *uio, int ioflag)
{
struct pps_data *sc = softc[minor(dev)];
int err, c;
c = imin(uio->uio_resid, (int)sizeof sc->ev);
err = uiomove((caddr_t)&sc->ev, c, uio);
return(err);
}
static int
ppswrite(dev_t dev, struct uio *uio, int ioflag)
{
struct pps_data *sc = softc[minor(dev)];
int err, c;
c = imin(uio->uio_resid, (int)sizeof sc->sawtooth);
err = uiomove((caddr_t)&sc->sawtooth, c, uio);
return(err);
}
static pps_devsw_installed = 0;
static void
pps_drvinit(void *unused)
{
dev_t dev;
if( ! pps_devsw_installed ) {
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev, &pps_cdevsw, NULL);
pps_devsw_installed = 1;
}
}
SYSINIT(ppsdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,pps_drvinit,NULL)