usb: use USBDescriptor for endpoint descriptors.

Add endpoint descriptor substruct to USBDescriptor,
use it in the descriptor generator code.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/usb/desc.c

@@ -200,21 +200,23 @@ int usb_desc_endpoint(const USBDescEndpoint *ep, uint8_t *dest, size_t len)
 {
     uint8_t bLength = ep->is_audio ? 0x09 : 0x07;
     uint8_t extralen = ep->extra ? ep->extra[0] : 0;
+    USBDescriptor *d = (void *)dest;
 
     if (len < bLength + extralen) {
         return -1;
     }
 
-    dest[0x00] = bLength;
-    dest[0x01] = USB_DT_ENDPOINT;
-    dest[0x02] = ep->bEndpointAddress;
-    dest[0x03] = ep->bmAttributes;
-    dest[0x04] = usb_lo(ep->wMaxPacketSize);
-    dest[0x05] = usb_hi(ep->wMaxPacketSize);
-    dest[0x06] = ep->bInterval;
+    d->bLength                      = bLength;
+    d->bDescriptorType              = USB_DT_ENDPOINT;
+
+    d->u.endpoint.bEndpointAddress  = ep->bEndpointAddress;
+    d->u.endpoint.bmAttributes      = ep->bmAttributes;
+    d->u.endpoint.wMaxPacketSize_lo = usb_lo(ep->wMaxPacketSize);
+    d->u.endpoint.wMaxPacketSize_hi = usb_hi(ep->wMaxPacketSize);
+    d->u.endpoint.bInterval         = ep->bInterval;
     if (ep->is_audio) {
-        dest[0x07] = ep->bRefresh;
-        dest[0x08] = ep->bSynchAddress;
+        d->u.endpoint.bRefresh      = ep->bRefresh;
+        d->u.endpoint.bSynchAddress = ep->bSynchAddress;
     }
     if (ep->extra) {
         memcpy(dest + bLength, ep->extra, extralen);

hw/usb/desc.h

@@ -54,6 +54,15 @@ typedef struct USBDescriptor {
             uint8_t           bInterfaceProtocol;
             uint8_t           iInterface;
         } interface;
+        struct {
+            uint8_t           bEndpointAddress;
+            uint8_t           bmAttributes;
+            uint8_t           wMaxPacketSize_lo;
+            uint8_t           wMaxPacketSize_hi;
+            uint8_t           bInterval;
+            uint8_t           bRefresh;        /* only audio ep */
+            uint8_t           bSynchAddress;   /* only audio ep */
+        } endpoint;
     } u;
 } QEMU_PACKED USBDescriptor;