selftests: watchdog: accept multiple params on command line

Watchdog drivers are not required to retain programming information,
such as timeouts, after the watchdog device is closed.  Therefore,
the watchdog test should be able to perform multiple actions after
opening the watchdog device.

For example, to set the timeout to 10s and ping every 5s:

	watchdog-test -t 10 -p 5 -e

Also, display the periodic decimal point only if the keep-alive call
succeeds.
Signed-off-by: Timur Tabi <timur@codeaurora.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/watchdog/watchdog-test.c

@@ -24,9 +24,11 @@ const char v = 'V';
 static void keep_alive(void)
 {
     int dummy;
+    int ret;
 
-    printf(".");
-    ioctl(fd, WDIOC_KEEPALIVE, &dummy);
+    ret = ioctl(fd, WDIOC_KEEPALIVE, &dummy);
+    if (!ret)
+        printf(".");
 }
 
 /*
@@ -51,6 +53,7 @@ int main(int argc, char *argv[])
     int flags;
     unsigned int ping_rate = 1;
     int ret;
+    int i;
 
     setbuf(stdout, NULL);
 
@@ -61,31 +64,35 @@ int main(int argc, char *argv[])
 	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;
-	}
+    for (i = 1; i < argc; i++) {
+        if (!strncasecmp(argv[i], "-d", 2)) {
+            flags = WDIOS_DISABLECARD;
+            ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
+            if (!ret)
+                printf("Watchdog card disabled.\n");
+        } else if (!strncasecmp(argv[i], "-e", 2)) {
+            flags = WDIOS_ENABLECARD;
+            ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
+            if (!ret)
+                printf("Watchdog card enabled.\n");
+        } else if (!strncasecmp(argv[i], "-t", 2) && argv[2]) {
+            flags = atoi(argv[i + 1]);
+            ret = ioctl(fd, WDIOC_SETTIMEOUT, &flags);
+            if (!ret)
+                printf("Watchdog timeout set to %u seconds.\n", flags);
+            i++;
+        } else if (!strncasecmp(argv[i], "-p", 2) && argv[2]) {
+            ping_rate = strtoul(argv[i + 1], NULL, 0);
+            printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
+            i++;
+        } else {
+            printf("-d to disable, -e to enable, -t <n> to set "
+                "the timeout,\n-p <n> to set the ping rate, and ");
+            printf("run by itself to tick the card.\n");
+            printf("Parameters are parsed left-to-right in real-time.\n");
+            printf("Example: %s -d -t 10 -p 5 -e\n", argv[0]);
+            goto end;
+        }
     }
 
     printf("Watchdog Ticking Away!\n");