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/*
* ----------------------------------------------------------------------------
* "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 1.9 1998/06/21 18:02:32 bde Exp $
*
* This driver implements a draft-mogul-pps-api-02.txt PPS source.
*
* The input pin is pin#10
* The echo output pin is pin#14
*
*/
#include "opt_devfs.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/timepps.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif
#include <sys/malloc.h>
#include <dev/ppbus/ppbconf.h>
#include "pps.h"
#define PPS_NAME "lppps" /* our official name */
static struct pps_data {
int pps_unit;
struct ppb_device pps_dev;
pps_params_t ppsparam;
pps_info_t ppsinfo;
} *softc[NPPS];
static int ppscap =
PPS_CAPTUREASSERT |
PPS_HARDPPSONASSERT |
PPS_OFFSETASSERT |
PPS_ECHOASSERT |
PPS_TSFMT_TSPEC;
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_ioctl_t ppsioctl;
#define CDEV_MAJOR 89
static struct cdevsw pps_cdevsw =
{ ppsopen, ppsclose, noread, nowrite,
ppsioctl, 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.name = ppsdriver.name;
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, IRQENABLE);
return(0);
}
static int
ppsclose(dev_t dev, int flags, int fmt, struct proc *p)
{
struct pps_data *sc = softc[minor(dev)];
sc->ppsparam.mode = 0;
ppb_release_bus(&sc->pps_dev);
return(0);
}
static void
ppsintr(int unit)
{
struct pps_data *sc = softc[unit];
struct timespec tc;
struct timeval tv;
nanotime(&tc);
if (!(ppb_rstr(&sc->pps_dev) & nACK))
return;
if (sc->ppsparam.mode & PPS_ECHOASSERT)
ppb_wctr(&sc->pps_dev, IRQENABLE | AUTOFEED);
if (sc->ppsparam.mode & PPS_OFFSETASSERT) {
timespecadd(&tc, &sc->ppsparam.assert_offset);
if (tc.tv_nsec < 0) {
tc.tv_sec--;
tc.tv_nsec += 1000000000;
}
}
sc->ppsinfo.assert_timestamp = tc;
sc->ppsinfo.assert_sequence++;
if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) {
tv.tv_sec = tc.tv_sec;
tv.tv_usec = tc.tv_nsec / 1000;
hardpps(&tv, tv.tv_usec);
}
if (sc->ppsparam.mode & PPS_ECHOASSERT)
ppb_wctr(&sc->pps_dev, IRQENABLE);
}
static int
ppsioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
struct pps_data *sc = softc[minor(dev)];
return (std_pps_ioctl(cmd, data, &sc->ppsparam, &sc->ppsinfo, ppscap));
}
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)
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