split out device-specific recovery UI code into vendor directories

Take some device-specific details of the recovery UI (eg, what keys to
press to bring up the interface and perform actions, exact text of the
menu, etc.) and split them out into separate C functions.  Arrange to
take implementations of those functions from the appropriate vendor
directory at build time.  Provide a default implementation in case no
vendor-specific one is available.
diff --git a/default_recovery_ui.c b/default_recovery_ui.c
new file mode 100644
index 0000000..7bc5f2c
--- /dev/null
+++ b/default_recovery_ui.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <linux/input.h>
+
+#include "recovery_ui.h"
+#include "common.h"
+
+char* MENU_HEADERS[] = { "Android system recovery utility",
+                         "",
+                         NULL };
+
+char* MENU_ITEMS[] = { "reboot system now",
+                       "apply sdcard:update.zip",
+                       "wipe data/factory reset",
+                       "wipe cache partition",
+                       NULL };
+
+int device_toggle_display(char* key_pressed, int key_code) {
+  return key_code == KEY_HOME;
+}
+
+int device_reboot_now(char* key_pressed, int key_code) {
+  return 0;
+}
+
+int device_handle_key(int key_code, int visible) {
+  if (visible) {
+    switch (key_code) {
+      case KEY_DOWN:
+      case KEY_VOLUMEDOWN:
+        return HIGHLIGHT_DOWN;
+
+      case KEY_UP:
+      case KEY_VOLUMEUP:
+        return HIGHLIGHT_UP;
+
+      case KEY_ENTER:
+        return SELECT_ITEM;
+    }
+  }
+
+  return NO_ACTION;
+}
+
+void device_perform_action(int which) {
+  // none defined
+}