1 files changed, 16 insertions, 5 deletions

diff --git a/tools/usb/testusb.c b/tools/usb/testusb.c
index 82d7c590c026..b0adb2710c02 100644
--- a/tools/usb/testusb.c
+++ b/tools/usb/testusb.c
@@ -425,7 +425,7 @@ int main (int argc, char **argv)
         /* for easy use when hotplugging */
         device = getenv ("DEVICE");
 
-        while ((c = getopt (argc, argv, "D:aA:c:g:hns:t:v:")) != EOF)
+        while ((c = getopt (argc, argv, "D:aA:c:g:hlns:t:v:")) != EOF)
         switch (c) {
         case 'D':       /* device, if only one */
                 device = optarg;
@@ -468,10 +468,21 @@ int main (int argc, char **argv)
         case 'h':
         default:
 usage:
-                fprintf (stderr, "usage: %s [-n] [-D dev | -a | -A usbfs-dir]\n"
-                        "\t[-c iterations]  [-t testnum]\n"
-                        "\t[-s packetsize] [-g sglen] [-v vary]\n",
-                        argv [0]);
+                fprintf (stderr,
+                        "usage: %s [options]\n"
+                        "Options:\n"
+                        "\t-D dev               only test specific device\n"
+                        "\t-A usbfs-dir\n"
+                        "\t-a           test all recognized devices\n"
+                        "\t-l           loop forever(for stress test)\n"
+                        "\t-t testnum   only run specified case\n"
+                        "\t-n           no test running, show devices to be tested\n"
+                        "Case arguments:\n"
+                        "\t-c iterations        default 1000\n"
+                        "\t-s packetsize        default 512\n"
+                        "\t-g sglen     default 32\n"
+                        "\t-v vary              default 512\n",
+                        argv[0]);
                 return 1;
         }
         if (optind != argc)