usb: add usb_find_device()

Add usb_find_device().  This function will check whenever a device with
a specific address is connected to the specified port.  Usually this
will just check state and address of the device hooked up to the port,
but in case of a hub it will ask the hub to check all hub ports for a
matching device.

This patch doesn't put the code into use yet, see the following patches
for details.

The master plan is to separate device lookup and packet processing.
Right now the usb code simply walks all devices, calls
usb_handle_packet() on each until one accepts the packet (by returning
something different that USB_RET_NODEV).  I want to have a device lookup
first, then call usb_handle_packet() once, for the device which actually
processes the packet.

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

1 files changed, 9 insertions, 0 deletions

diff --git a/hw/usb-bus.c b/hw/usb-bus.c
index b753834584..5c05ed5806 100644
--- a/hw/usb-bus.c
+++ b/hw/usb-bus.c
@@ -74,6 +74,15 @@ static int usb_device_init(USBDevice *dev)
     return 0;
 }
 
+USBDevice *usb_device_find_device(USBDevice *dev, uint8_t addr)
+{
+    USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
+    if (klass->find_device) {
+        return klass->find_device(dev, addr);
+    }
+    return NULL;
+}
+
 static void usb_device_handle_destroy(USBDevice *dev)
 {
     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);