1 files changed, 48 insertions, 0 deletions
diff --git a/core/java/android/hardware/Usb.java b/core/java/android/hardware/Usb.java
index 57271d4..ebb8296 100644
--- a/core/java/android/hardware/Usb.java
+++ b/core/java/android/hardware/Usb.java
@@ -17,6 +17,10 @@
 
 package android.hardware;
 
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+
 /**
  * Class for accessing USB state information.
  * @hide
@@ -55,6 +59,24 @@ public class Usb {
     public static final String ACTION_USB_STATE =
             "android.hardware.action.USB_STATE";
 
+   /**
+     * Broadcast Action:  A broadcast for USB camera attached event.
+     *
+     * This intent is sent when a USB device supporting PTP is attached to the host USB bus.
+     * The intent's data contains a Uri for the device in the MTP provider.
+     */
+    public static final String ACTION_USB_CAMERA_ATTACHED =
+            "android.hardware.action.USB_CAMERA_ATTACHED";
+
+   /**
+     * Broadcast Action:  A broadcast for USB camera detached event.
+     *
+     * This intent is sent when a USB device supporting PTP is detached from the host USB bus.
+     * The intent's data contains a Uri for the device in the MTP provider.
+     */
+    public static final String ACTION_USB_CAMERA_DETACHED =
+            "android.hardware.action.USB_CAMERA_DETACHED";
+
     /**
      * Boolean extra indicating whether USB is connected or disconnected.
      * Used in extras for the {@link #ACTION_USB_STATE} broadcast.
@@ -96,4 +118,30 @@ public class Usb {
      * Used in extras for the {@link #ACTION_USB_CONNECTED} broadcast
      */
     public static final String USB_FUNCTION_DISABLED = "disabled";
+
+    private static File getFunctionEnableFile(String function) {
+        return new File("/sys/class/usb_composite/" + function + "/enable");
+    }
+
+    /**
+     * Returns true if the specified USB function is supported by the kernel.
+     * Note that a USB function maybe supported but disabled.
+     */
+    public static boolean isFunctionSupported(String function) {
+        return getFunctionEnableFile(function).exists();
+    }
+
+    /**
+     * Returns true if the specified USB function is currently enabled.
+     */
+    public static boolean isFunctionEnabled(String function) {
+        try {
+            FileInputStream stream = new FileInputStream(getFunctionEnableFile(function));
+            boolean enabled = (stream.read() == '1');
+            stream.close();
+            return enabled;
+        } catch (IOException e) {
+            return false;
+        }
+    }
 }