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); 99