Add a generic watchdog facility which through a single device entry

in /dev controls all available watchdog implementations.

1 files changed, 89 insertions, 0 deletions

diff --git a/sys/dev/watchdog/watchdog.c b/sys/dev/watchdog/watchdog.c
new file mode 100644
index 0000000..a76e3ef
--- /dev/null
+++ b/sys/dev/watchdog/watchdog.c
@@ -0,0 +1,89 @@
+/*-
+ * 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 dev_t wd_dev;
+
+static int
+wd_ioctl(dev_t dev __unused, u_long cmd, caddr_t data,
+    int flags __unused, struct thread *td)
+{
+	int error;
+	u_int u;
+
+	if (cmd != WDIOCPATPAT)
+		return (ENOIOCTL);
+	u = *(u_int *)data;
+	if (u & ~(WD_ACTIVE | WD_PASSIVE | WD_INTERVAL))
+		return (EINVAL);
+	if ((u & (WD_ACTIVE | WD_PASSIVE)) == (WD_ACTIVE | WD_PASSIVE))
+		return (EINVAL);
+	if ((u & WD_INTERVAL) == WD_TO_NEVER)
+		u = 0;
+	error = EOPNOTSUPP;
+	EVENTHANDLER_INVOKE(watchdog_list, u, &error);
+	return (error);
+}
+
+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);