3 files changed, 172 insertions, 0 deletions
diff --git a/tools/testing/selftests/watchdog/.gitignore b/tools/testing/selftests/watchdog/.gitignore
new file mode 100644
index 000000000..5aac51575
--- /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 000000000..6b5598b55
--- /dev/null
+++ b/tools/testing/selftests/watchdog/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+TEST_GEN_PROGS := watchdog-test
+
+include ../lib.mk
diff --git a/tools/testing/selftests/watchdog/watchdog-test.c b/tools/testing/selftests/watchdog/watchdog-test.c
new file mode 100644
index 000000000..f1c6e025c
--- /dev/null
+++ b/tools/testing/selftests/watchdog/watchdog-test.c
@@ -0,0 +1,167 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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 <getopt.h>
+#include <sys/ioctl.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+
+#define DEFAULT_PING_RATE	1
+
+int fd;
+const char v = 'V';
+static const char sopts[] = "bdehp:t:";
+static const struct option lopts[] = {
+	{"bootstatus",          no_argument, NULL, 'b'},
+	{"disable",             no_argument, NULL, 'd'},
+	{"enable",              no_argument, NULL, 'e'},
+	{"help",                no_argument, NULL, 'h'},
+	{"pingrate",      required_argument, NULL, 'p'},
+	{"timeout",       required_argument, NULL, 't'},
+	{NULL,                  no_argument, NULL, 0x0}
+};
+
+/*
+ * 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;
+	int ret;
+
+	ret = ioctl(fd, WDIOC_KEEPALIVE, &dummy);
+	if (!ret)
+		printf(".");
+}
+
+/*
+ * 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);
+}
+
+static void usage(char *progname)
+{
+	printf("Usage: %s [options]\n", progname);
+	printf(" -b, --bootstatus    Get last boot status (Watchdog/POR)\n");
+	printf(" -d, --disable       Turn off the watchdog timer\n");
+	printf(" -e, --enable        Turn on the watchdog timer\n");
+	printf(" -h, --help          Print the help message\n");
+	printf(" -p, --pingrate=P    Set ping rate to P seconds (default %d)\n", DEFAULT_PING_RATE);
+	printf(" -t, --timeout=T     Set timeout to T seconds\n");
+	printf("\n");
+	printf("Parameters are parsed left-to-right in real-time.\n");
+	printf("Example: %s -d -t 10 -p 5 -e\n", progname);
+}
+
+int main(int argc, char *argv[])
+{
+	int flags;
+	unsigned int ping_rate = DEFAULT_PING_RATE;
+	int ret;
+	int c;
+	int oneshot = 0;
+
+	setbuf(stdout, NULL);
+
+	fd = open("/dev/watchdog", O_WRONLY);
+
+	if (fd == -1) {
+		if (errno == ENOENT)
+			printf("Watchdog device not enabled.\n");
+		else if (errno == EACCES)
+			printf("Run watchdog as root.\n");
+		else
+			printf("Watchdog device open failed %s\n",
+				strerror(errno));
+		exit(-1);
+	}
+
+	while ((c = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
+		switch (c) {
+		case 'b':
+			flags = 0;
+			oneshot = 1;
+			ret = ioctl(fd, WDIOC_GETBOOTSTATUS, &flags);
+			if (!ret)
+				printf("Last boot is caused by: %s.\n", (flags != 0) ?
+					"Watchdog" : "Power-On-Reset");
+			else
+				printf("WDIOC_GETBOOTSTATUS error '%s'\n", strerror(errno));
+			break;
+		case 'd':
+			flags = WDIOS_DISABLECARD;
+			ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
+			if (!ret)
+				printf("Watchdog card disabled.\n");
+			else
+				printf("WDIOS_DISABLECARD error '%s'\n", strerror(errno));
+			break;
+		case 'e':
+			flags = WDIOS_ENABLECARD;
+			ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
+			if (!ret)
+				printf("Watchdog card enabled.\n");
+			else
+				printf("WDIOS_ENABLECARD error '%s'\n", strerror(errno));
+			break;
+		case 'p':
+			ping_rate = strtoul(optarg, NULL, 0);
+			if (!ping_rate)
+				ping_rate = DEFAULT_PING_RATE;
+			printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
+			break;
+		case 't':
+			flags = strtoul(optarg, NULL, 0);
+			ret = ioctl(fd, WDIOC_SETTIMEOUT, &flags);
+			if (!ret)
+				printf("Watchdog timeout set to %u seconds.\n", flags);
+			else
+				printf("WDIOC_SETTIMEOUT error '%s'\n", strerror(errno));
+			break;
+		default:
+			usage(argv[0]);
+			goto end;
+		}
+	}
+
+	if (oneshot)
+		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;
+}