watchdog.c

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    1 /*-
    2  * Copyright (c) 2004 Poul-Henning Kamp
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/conf.h>
   34 #include <sys/uio.h>
   35 #include <sys/kernel.h>
   36 #include <sys/malloc.h>
   37 #include <sys/module.h>
   38 #include <sys/watchdog.h>
   39 #include <sys/bus.h>
   40 #include <machine/bus.h>
   41 
   42 static struct cdev *wd_dev;
   43 
   44 static int
   45 wd_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t data,
   46     int flags __unused, struct thread *td)
   47 {
   48         int error;
   49         u_int u;
   50 
   51         if (cmd != WDIOCPATPAT)
   52                 return (ENOIOCTL);
   53         u = *(u_int *)data;
   54         if (u & ~(WD_ACTIVE | WD_PASSIVE | WD_INTERVAL))
   55                 return (EINVAL);
   56         if ((u & (WD_ACTIVE | WD_PASSIVE)) == (WD_ACTIVE | WD_PASSIVE))
   57                 return (EINVAL);
   58         if ((u & (WD_ACTIVE | WD_PASSIVE)) == 0 && (u & WD_INTERVAL) > 0)
   59                 return (EINVAL);
   60         if (u & WD_PASSIVE)
   61                 return (ENOSYS);        /* XXX Not implemented yet */
   62         if ((u & WD_INTERVAL) == WD_TO_NEVER) {
   63                 u = 0;
   64                 /* Assume all is well; watchdog signals failure. */
   65                 error = 0;
   66         } else {
   67                 /* Assume no watchdog available; watchdog flags success */
   68                 error = EOPNOTSUPP;
   69         }
   70         EVENTHANDLER_INVOKE(watchdog_list, u, &error);
   71         return (error);
   72 }
   73 
   74 static struct cdevsw wd_cdevsw = {
   75         .d_version =    D_VERSION,
   76         .d_ioctl =      wd_ioctl,
   77         .d_name =       "watchdog",
   78 };
   79 
   80 static int
   81 watchdog_modevent(module_t mod __unused, int type, void *data __unused)
   82 {
   83         switch(type) {
   84         case MOD_LOAD:
   85                 wd_dev = make_dev(&wd_cdevsw, 0,
   86                     UID_ROOT, GID_WHEEL, 0600, _PATH_WATCHDOG);
   87                 return 0;
   88         case MOD_UNLOAD:
   89                 destroy_dev(wd_dev);
   90                 return 0;
   91         case MOD_SHUTDOWN:
   92                 return 0;
   93         default:
   94                 return EOPNOTSUPP;
   95         }
   96 }
   97 
   98 DEV_MODULE(watchdog, watchdog_modevent, NULL);

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FreeBSD/Linux Kernel Cross Reference sys/dev/watchdog/watchdog.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/watchdog/watchdog.c