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>

1 files changed, 3 insertions, 0 deletions

diff --git a/hw/usb/dev-hid.c b/hw/usb/dev-hid.c
index b48899d500..31f3cdef42 100644
--- a/hw/usb/dev-hid.c
+++ b/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);