[v3,4/4] tests: add usb hcds hotplugging qtest

diff --git a/tests/Makefile b/tests/Makefile
index e5e1f87..7d1729e 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -161,6 +161,7 @@  gcov-files-i386-y += hw/usb/dev-hid.c
 gcov-files-i386-y += hw/usb/dev-storage.c
 check-qtest-i386-y += tests/usb-hcd-xhci-test$(EXESUF)
 gcov-files-i386-y += hw/usb/hcd-xhci.c
+check-qtest-i386-y += tests/usb-hcd-hotplug-test$(EXESUF)
 check-qtest-x86_64-y = $(check-qtest-i386-y)
 gcov-files-i386-y += i386-softmmu/hw/timer/mc146818rtc.c
 gcov-files-x86_64-y = $(subst i386-softmmu/,x86_64-softmmu/,$(gcov-files-i386-y))
@@ -330,6 +331,7 @@  tests/usb-hcd-ohci-test$(EXESUF): tests/usb-hcd-ohci-test.o
 tests/usb-hcd-uhci-test$(EXESUF): tests/usb-hcd-uhci-test.o
 tests/usb-hcd-ehci-test$(EXESUF): tests/usb-hcd-ehci-test.o $(libqos-pc-obj-y)
 tests/usb-hcd-xhci-test$(EXESUF): tests/usb-hcd-xhci-test.o
+tests/usb-hcd-hotplug-test$(EXESUF): tests/usb-hcd-hotplug-test.o
 tests/qemu-iotests/socket_scm_helper$(EXESUF): tests/qemu-iotests/socket_scm_helper.o
 tests/test-qemu-opts$(EXESUF): tests/test-qemu-opts.o libqemuutil.a libqemustub.a
 
diff --git a/tests/usb-hcd-hotplug-test.c b/tests/usb-hcd-hotplug-test.c
new file mode 100644
index 0000000..04bea97
--- /dev/null
+++ b/tests/usb-hcd-hotplug-test.c
@@ -0,0 +1,88 @@ 
+/*
+ * QTest testcase for usb host adapters hotplug/unplug
+ *
+ * Copyright (c) 2014 HUAWEI TECHNOLOGIES CO.,LTD.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include <glib.h>
+#include <string.h>
+#include "libqtest.h"
+#include "qemu/osdep.h"
+
+
+static void usb_hcd_hotplug(const char *hcd, const char *id)
+{
+    QDict *response;
+
+    qtest_start("");
+
+    /* hotplug an usb host adapter */
+    response = qmp("{\"execute\": \"device_add\","
+                   " \"arguments\": {"
+                   "   \"driver\": \"%s\","
+                   "   \"id\": \"%s\""
+                   "}}", hcd, id);
+    g_assert(response);
+    g_assert(!qdict_haskey(response, "error"));
+    QDECREF(response);
+
+    /* hotplug an usb-tablet to the usb host adapter, bus=$id.0 */
+    response = qmp("{\"execute\": \"device_add\","
+                       " \"arguments\": {"
+                       "   \"driver\": \"usb-tablet\","
+                       "   \"bus\": \"%s.0\""
+                       "}}", id);
+    g_assert(response);
+    g_assert(!qdict_haskey(response, "error"));
+    QDECREF(response);
+
+    /* delete the usb host adapter */
+    response = qmp("{\"execute\": \"device_del\","
+                   " \"arguments\": {"
+                   "   \"id\": \"%s\""
+                   "}}", id);
+    g_assert(response);
+    g_assert(!qdict_haskey(response, "error"));
+    QDECREF(response);
+
+    qtest_end();
+}
+
+static void test_ohci_hotplug(void)
+{
+    usb_hcd_hotplug("pci-ohci", "ohci");
+}
+
+static void test_uhci_hotplug(void)
+{
+    usb_hcd_hotplug("piix3-usb-uhci", "uhci");
+}
+
+static void test_ehci_hotplug(void)
+{
+    usb_hcd_hotplug("usb-ehci", "ehci");
+}
+
+static void test_xhci_hotplug(void)
+{
+    usb_hcd_hotplug("nec-usb-xhci", "xhci");
+}
+
+int main(int argc, char **argv)
+{
+    int ret;
+
+    g_test_init(&argc, &argv, NULL);
+
+    qtest_add_func("/usb/hcd/pci/ohci-hotplug", test_ohci_hotplug);
+    qtest_add_func("/usb/hcd/pci/uhci-hotplug", test_uhci_hotplug);
+    qtest_add_func("/usb/hcd/pci/ehci-hotplug", test_ehci_hotplug);
+    qtest_add_func("/usb/hcd/pci/xhci-hotplug", test_xhci_hotplug);
+
+    ret = g_test_run();
+
+    return ret;
+}