usb: add serial bus property

This patch adds a serial property for all usb devices, which can be
used to set the serial number of a usb device (as listed by lsusb -v)
to a specific value.  Applies to emulated devices only.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

hw/usb/bus.c

@@ -13,6 +13,7 @@ static int usb_qdev_exit(DeviceState *qdev);
 
 static Property usb_props[] = {
     DEFINE_PROP_STRING("port", USBDevice, port_path),
+    DEFINE_PROP_STRING("serial", USBDevice, serial),
     DEFINE_PROP_BIT("full-path", USBDevice, flags,
                     USB_DEV_FLAG_FULL_PATH, true),
     DEFINE_PROP_END_OF_LIST()

hw/usb/desc.c

@@ -566,6 +566,12 @@ void usb_desc_create_serial(USBDevice *dev)
     char *path;
     int dst;
 
+    if (dev->serial) {
+        /* 'serial' usb bus property has priority if present */
+        usb_desc_set_string(dev, index, dev->serial);
+        return;
+    }
+
     assert(index != 0 && desc->str[index] != NULL);
     dst = snprintf(serial, sizeof(serial), "%s", desc->str[index]);
     path = qdev_get_dev_path(hcd);

hw/usb/dev-hid.c

@@ -560,6 +560,9 @@ static int usb_hid_initfn(USBDevice *dev, int kind)
 {
     USBHIDState *us = DO_UPCAST(USBHIDState, dev, dev);
 
+    if (dev->serial) {
+        usb_desc_set_string(dev, STR_SERIALNUMBER, dev->serial);
+    }
     usb_desc_init(dev);
     us->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);
     hid_init(&us->hid, kind, usb_hid_changed);

hw/usb/dev-storage.c

@@ -58,7 +58,6 @@ typedef struct {
     USBPacket *packet;
     /* usb-storage only */
     BlockConf conf;
-    char *serial;
     uint32_t removable;
 } MSDState;
 
@@ -602,7 +601,7 @@ static int usb_msd_initfn_storage(USBDevice *dev)
         return -1;
     }
 
-    blkconf_serial(&s->conf, &s->serial);
+    blkconf_serial(&s->conf, &dev->serial);
 
     /*
      * Hack alert: this pretends to be a block device, but it's really
@@ -616,16 +615,11 @@ static int usb_msd_initfn_storage(USBDevice *dev)
     bdrv_detach_dev(bs, &s->dev.qdev);
     s->conf.bs = NULL;
 
-    if (s->serial) {
-        usb_desc_set_string(dev, STR_SERIALNUMBER, s->serial);
-    } else {
-        usb_desc_create_serial(dev);
-    }
-
+    usb_desc_create_serial(dev);
     usb_desc_init(dev);
     scsi_bus_new(&s->bus, &s->dev.qdev, &usb_msd_scsi_info_storage, NULL);
     scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable,
-                                            s->conf.bootindex, s->serial);
+                                            s->conf.bootindex, dev->serial);
     if (!scsi_dev) {
         return -1;
     }
@@ -734,7 +728,6 @@ static const VMStateDescription vmstate_usb_msd = {
 
 static Property msd_properties[] = {
     DEFINE_BLOCK_PROPERTIES(MSDState, conf),
-    DEFINE_PROP_STRING("serial", MSDState, serial),
     DEFINE_PROP_BIT("removable", MSDState, removable, 0, false),
     DEFINE_PROP_END_OF_LIST(),
 };

include/hw/usb.h

@@ -205,6 +205,7 @@ struct USBDevice {
     DeviceState qdev;
     USBPort *port;
     char *port_path;
+    char *serial;
     void *opaque;
     uint32_t flags;