NetBSD/sys/dev/ppbus/pps_ppbus.c

/* $NetBSD: pps_ppbus.c,v 1.1 2004/01/28 17:27:06 drochner Exp $ */

/*
 * Copyright (c) 2004
 * 	Matthias Drochner.  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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pps_ppbus.c,v 1.1 2004/01/28 17:27:06 drochner Exp $");

#include "opt_ntp.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <sys/timepps.h>

#include <dev/ppbus/ppbus_base.h>
#include <dev/ppbus/ppbus_device.h>
#include <dev/ppbus/ppbus_io.h>
#include <dev/ppbus/ppbus_var.h>

struct pps_softc {
	struct ppbus_device_softc pps_dev;	
	struct device *ppbus;
	int busy;
	pps_info_t ppsinfo;
	pps_params_t ppsparam;
#ifdef PPS_SYNC
	int hardpps;
#endif
};

static int pps_probe(struct device *, struct cfdata *, void *);
static void pps_attach(struct device *, struct device *, void *);
CFATTACH_DECL(pps, sizeof(struct pps_softc), pps_probe, pps_attach, 
	NULL, NULL);
extern struct cfdriver pps_cd;

static dev_type_open(ppsopen);
static dev_type_close(ppsclose);
static dev_type_ioctl(ppsioctl);
const struct cdevsw pps_cdevsw = {
	ppsopen, ppsclose, noread, nowrite, ppsioctl,
	nostop, notty, nopoll, nommap, nokqfilter 
};

static void ppsintr(void *arg);

static int ppscap = PPS_TSFMT_TSPEC | PPS_CAPTUREASSERT | PPS_OFFSETASSERT;

static int
pps_probe(struct device *parent, struct cfdata *match, void *aux)
{
	struct ppbus_attach_args *args = aux;

	/* we need an interrupt */ 
	if (!(args->capabilities & PPBUS_HAS_INTR))
		return 0;

	return 1;
}

static void
pps_attach(struct device *parent, struct device *self, void *aux)
{
	struct pps_softc *sc = (struct pps_softc *)self;

	sc->ppbus = parent;

	printf("\n");
}

static int
ppsopen(dev_t dev, int flags, int fmt, struct proc *p)
{
	struct pps_softc *sc;
	int res;

	sc = device_lookup(&pps_cd, minor(dev));
	if (!sc)
		return (ENXIO);

	if (sc->busy)
		return (0);

	if (ppbus_request_bus(sc->ppbus, &sc->pps_dev.sc_dev,
			      PPBUS_WAIT|PPBUS_INTR, 0))
		return (EINTR);

	/* attach the interrupt handler */
	/* XXX priority should be set here */
	res = ppbus_add_handler(sc->ppbus, ppsintr, sc);
	if (res) {
		ppbus_release_bus(sc->ppbus, &sc->pps_dev.sc_dev,
				  PPBUS_WAIT, 0);
		return (res);
	}

	ppbus_set_mode(sc->ppbus, PPBUS_PS2, 0);
	ppbus_wctr(sc->ppbus, IRQENABLE | PCD | nINIT | SELECTIN);

	sc->busy = 1;
	return (0);
}

static int
ppsclose(dev_t dev, int flags, int fmt, struct proc *p)
{
	struct pps_softc *sc = device_lookup(&pps_cd, minor(dev));
	struct device *ppbus = sc->ppbus;

	sc->ppsparam.mode = 0;
	sc->busy = 0;
#ifdef PPS_SYNC
	sc->hardpps = 0;
#endif
	ppbus_wdtr(ppbus, 0);
	ppbus_wctr(ppbus, 0);

	ppbus_remove_handler(ppbus, ppsintr);
	ppbus_set_mode(ppbus, PPBUS_COMPATIBLE, 0);
	ppbus_release_bus(ppbus, &sc->pps_dev.sc_dev, PPBUS_WAIT, 0);
	return (0);
}

static void
ppsintr(void *arg)
{
	struct pps_softc *sc = arg;
	struct device *ppbus = sc->ppbus;
	struct timeval tv;

	if (!(ppbus_rstr(ppbus) & nACK))
		return;

	microtime(&tv);
	TIMEVAL_TO_TIMESPEC(&tv, &sc->ppsinfo.assert_timestamp);
	if (sc->ppsparam.mode & PPS_OFFSETASSERT) {
		timespecadd(&sc->ppsinfo.assert_timestamp,
			    &sc->ppsparam.assert_offset,
			    &sc->ppsinfo.assert_timestamp);
	}
#ifdef PPS_SYNC
	if (sc->hardpps)
		hardpps(&tv, tv.tv_usec);
#endif
	sc->ppsinfo.assert_sequence++;
	sc->ppsinfo.current_mode = sc->ppsparam.mode;
}

static int
ppsioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
	struct pps_softc *sc = device_lookup(&pps_cd, minor(dev));
	int error = 0;

	switch (cmd) {
	case PPS_IOC_CREATE:
		break;

	case PPS_IOC_DESTROY:
		break;

	case PPS_IOC_GETPARAMS: {
		pps_params_t *pp;
		pp = (pps_params_t *)data;
		*pp = sc->ppsparam;
		break;
	}

	case PPS_IOC_SETPARAMS: {
	  	pps_params_t *pp;
		pp = (pps_params_t *)data;
		if (pp->mode & ~(ppscap)) {
			error = EINVAL;
			break;
		}
		sc->ppsparam = *pp;
		break;
	}

	case PPS_IOC_GETCAP:
		*(int*)data = ppscap;
		break;

	case PPS_IOC_FETCH: {
		pps_info_t *pi;
		pi = (pps_info_t *)data;
		*pi = sc->ppsinfo;
		break;
	}

#ifdef PPS_SYNC
	case PPS_IOC_KCBIND:
		if (*(int *)data & PPS_CAPTUREASSERT)
			sc->hardpps = 1;
		else
			sc->hardpps = 0;
		break;
#endif

	default:
		error = EPASSTHROUGH;
		break;
	}
	return (error);
}