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/*-
* Copyright (c) 2004 Poul-Henning Kamp
* 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
* in this position and unchanged.
* 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 AUTHORS ``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 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>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/watchdog.h>
#include <sys/bus.h>
#include <machine/bus.h>
static struct cdev *wd_dev;
static volatile u_int wd_last_u;
static int
kern_do_pat(u_int utim)
{
int error;
if ((utim & WD_LASTVAL) != 0 && (utim & WD_INTERVAL) > 0)
return (EINVAL);
if ((utim & WD_LASTVAL) != 0) {
MPASS((wd_last_u & ~WD_INTERVAL) == 0);
utim &= ~WD_LASTVAL;
utim |= wd_last_u;
} else
wd_last_u = (utim & WD_INTERVAL);
if ((utim & WD_INTERVAL) == WD_TO_NEVER) {
utim = 0;
/* Assume all is well; watchdog signals failure. */
error = 0;
} else {
/* Assume no watchdog available; watchdog flags success */
error = EOPNOTSUPP;
}
EVENTHANDLER_INVOKE(watchdog_list, utim, &error);
return (error);
}
static int
wd_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t data,
int flags __unused, struct thread *td)
{
u_int u;
if (cmd != WDIOCPATPAT)
return (ENOIOCTL);
u = *(u_int *)data;
if (u & ~(WD_ACTIVE | WD_PASSIVE | WD_LASTVAL | WD_INTERVAL))
return (EINVAL);
if ((u & (WD_ACTIVE | WD_PASSIVE)) == (WD_ACTIVE | WD_PASSIVE))
return (EINVAL);
if ((u & (WD_ACTIVE | WD_PASSIVE)) == 0 && ((u & WD_INTERVAL) > 0 ||
(u & WD_LASTVAL) != 0))
return (EINVAL);
if (u & WD_PASSIVE)
return (ENOSYS); /* XXX Not implemented yet */
u &= ~(WD_ACTIVE | WD_PASSIVE);
return (kern_do_pat(u));
}
u_int
wdog_kern_last_timeout(void)
{
return (wd_last_u);
}
int
wdog_kern_pat(u_int utim)
{
if (utim & ~(WD_LASTVAL | WD_INTERVAL))
return (EINVAL);
return (kern_do_pat(utim));
}
static struct cdevsw wd_cdevsw = {
.d_version = D_VERSION,
.d_ioctl = wd_ioctl,
.d_name = "watchdog",
};
static int
watchdog_modevent(module_t mod __unused, int type, void *data __unused)
{
switch(type) {
case MOD_LOAD:
wd_dev = make_dev(&wd_cdevsw, 0,
UID_ROOT, GID_WHEEL, 0600, _PATH_WATCHDOG);
return 0;
case MOD_UNLOAD:
destroy_dev(wd_dev);
return 0;
case MOD_SHUTDOWN:
return 0;
default:
return EOPNOTSUPP;
}
}
DEV_MODULE(watchdog, watchdog_modevent, NULL);
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