Add logic to register HID keybaord and mouse classes; fix some conditional compilation. From Leo

ChangeLog

@@ -7192,4 +7192,7 @@
 	  Sourceforge bug 25 submitted by Luciano Neri (2014-4-17).
 	* arch/arm/src/stm32/stm32_otgfshost.c:  Some fixes related to low-speed
 	  devices and interrupt endpoints from Leo (2014-4-17).
-
+	* configs/stm32f4discovery/src/stm32_usb.c:  Add support to register
+	  keyboard and mouse classes if so configured.  From Leo (2014-4-17).
+	* include/nuttx/usb/usbhost:  Fix some USB HID-related conditional
+	  compilation.  From Leo (2014-4-17).

configs/stm32f4discovery/src/stm32_usb.c

@@ -177,11 +177,30 @@ int stm32_usbhost_initialize(void)
    */
 
   uvdbg("Register class drivers\n");
+
+#ifdef CONFIG_USBHOST_MSC
   ret = usbhost_storageinit();
   if (ret != OK)
     {
       udbg("Failed to register the mass storage class\n");
     }
+#endif
+
+#ifdef CONFIG_USBHOST_HIDKBD
+  ret = usbhost_kbdinit();
+  if (ret != OK)
+    {
+      udbg("Failed to register the HID keyboard class\n");
+    }
+#endif
+
+#ifdef CONFIG_USBHOST_HIDMOUSE
+  ret = usbhost_mouse_init();
+  if (ret != OK)
+    {
+      udbg("Failed to register the HID mouse class\n");
+    }
+#endif
 
   /* Then get an instance of the USB host interface */
 

include/nuttx/usb/usbhost.h

@@ -798,6 +798,7 @@ int usbhost_registerclass(struct usbhost_registry_s *class);
 
 const struct usbhost_registry_s *usbhost_findclass(const struct usbhost_id_s *id);
 
+#ifdef CONFIG_USBHOST_MSC
 /****************************************************************************
  * Name: usbhost_storageinit
  *
@@ -816,7 +817,9 @@ const struct usbhost_registry_s *usbhost_findclass(const struct usbhost_id_s *id
  ****************************************************************************/
 
 int usbhost_storageinit(void);
+#endif
 
+#ifdef CONFIG_USBHOST_HIDKBD
 /****************************************************************************
  * Name: usbhost_kbdinit
  *
@@ -835,7 +838,9 @@ int usbhost_storageinit(void);
  ****************************************************************************/
 
 int usbhost_kbdinit(void);
+#endif
 
+#ifdef CONFIG_USBHOST_HIDMOUSE
 /****************************************************************************
  * Name: usbhost_mouse_init
  *
@@ -854,6 +859,7 @@ int usbhost_kbdinit(void);
  ****************************************************************************/
 
 int usbhost_mouse_init(void);
+#endif
 
 /****************************************************************************
  * Name: usbhost_wlaninit