3 files changed, 114 insertions, 0 deletions
diff --git a/tools/testing/selftests/watchdog/.gitignore b/tools/testing/selftests/watchdog/.gitignore
new file mode 100644
index 000000000000..5aac51575c7e
--- /dev/null
+++ b/tools/testing/selftests/watchdog/.gitignore
@@ -0,0 +1 @@
+watchdog-test
diff --git a/tools/testing/selftests/watchdog/Makefile b/tools/testing/selftests/watchdog/Makefile
new file mode 100644
index 000000000000..f863c664e3d1
--- /dev/null
+++ b/tools/testing/selftests/watchdog/Makefile
@@ -0,0 +1,8 @@
+TEST_PROGS := watchdog-test
+
+all: $(TEST_PROGS)
+
+include ../lib.mk
+
+clean:
+	rm -fr $(TEST_PROGS)
diff --git a/tools/testing/selftests/watchdog/watchdog-test.c b/tools/testing/selftests/watchdog/watchdog-test.c
new file mode 100644
index 000000000000..6983d05097e2
--- /dev/null
+++ b/tools/testing/selftests/watchdog/watchdog-test.c
@@ -0,0 +1,105 @@
+/*
+ * Watchdog Driver Test Program
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+
+int fd;
+const char v = 'V';
+
+/*
+ * This function simply sends an IOCTL to the driver, which in turn ticks
+ * the PC Watchdog card to reset its internal timer so it doesn't trigger
+ * a computer reset.
+ */
+static void keep_alive(void)
+{
+    int dummy;
+
+    printf(".");
+    ioctl(fd, WDIOC_KEEPALIVE, &dummy);
+}
+
+/*
+ * The main program.  Run the program with "-d" to disable the card,
+ * or "-e" to enable the card.
+ */
+
+static void term(int sig)
+{
+    int ret = write(fd, &v, 1);
+
+    close(fd);
+    if (ret < 0)
+	printf("\nStopping watchdog ticks failed (%d)...\n", errno);
+    else
+	printf("\nStopping watchdog ticks...\n");
+    exit(0);
+}
+
+int main(int argc, char *argv[])
+{
+    int flags;
+    unsigned int ping_rate = 1;
+    int ret;
+
+    setbuf(stdout, NULL);
+
+    fd = open("/dev/watchdog", O_WRONLY);
+
+    if (fd == -1) {
+	printf("Watchdog device not enabled.\n");
+	exit(-1);
+    }
+
+    if (argc > 1) {
+	if (!strncasecmp(argv[1], "-d", 2)) {
+	    flags = WDIOS_DISABLECARD;
+	    ioctl(fd, WDIOC_SETOPTIONS, &flags);
+	    printf("Watchdog card disabled.\n");
+	    goto end;
+	} else if (!strncasecmp(argv[1], "-e", 2)) {
+	    flags = WDIOS_ENABLECARD;
+	    ioctl(fd, WDIOC_SETOPTIONS, &flags);
+	    printf("Watchdog card enabled.\n");
+	    goto end;
+	} else if (!strncasecmp(argv[1], "-t", 2) && argv[2]) {
+	    flags = atoi(argv[2]);
+	    ioctl(fd, WDIOC_SETTIMEOUT, &flags);
+	    printf("Watchdog timeout set to %u seconds.\n", flags);
+	    goto end;
+	} else if (!strncasecmp(argv[1], "-p", 2) && argv[2]) {
+	    ping_rate = strtoul(argv[2], NULL, 0);
+	    printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
+	} else {
+	    printf("-d to disable, -e to enable, -t <n> to set " \
+		"the timeout,\n-p <n> to set the ping rate, and \n");
+	    printf("run by itself to tick the card.\n");
+	    goto end;
+	}
+    }
+
+    printf("Watchdog Ticking Away!\n");
+
+    signal(SIGINT, term);
+
+    while(1) {
+	keep_alive();
+	sleep(ping_rate);
+    }
+end:
+    ret = write(fd, &v, 1);
+    if (ret < 0)
+	printf("Stopping watchdog ticks failed (%d)...\n", errno);
+    close(fd);
+    return 0;
+}