1 files changed, 147 insertions, 0 deletions
diff --git a/core/java/android/hardware/UsbManager.java b/core/java/android/hardware/UsbManager.java
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+++ b/core/java/android/hardware/UsbManager.java
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+/*
+ * Copyright (C) 2010 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.
+ */
+
+
+package android.hardware;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+
+/**
+ * Class for accessing USB state information.
+ * @hide
+ */
+public class UsbManager {
+   /**
+     * Broadcast Action:  A broadcast for USB connected events.
+     *
+     * The extras bundle will name/value pairs with the name of the function
+     * and a value of either {@link #USB_FUNCTION_ENABLED} or {@link #USB_FUNCTION_DISABLED}.
+     * Possible USB function names include {@link #USB_FUNCTION_MASS_STORAGE},
+     * {@link #USB_FUNCTION_ADB}, {@link #USB_FUNCTION_RNDIS} and {@link #USB_FUNCTION_MTP}.
+     */
+    public static final String ACTION_USB_CONNECTED =
+            "android.hardware.action.USB_CONNECTED";
+
+   /**
+     * Broadcast Action:  A broadcast for USB disconnected events.
+     */
+    public static final String ACTION_USB_DISCONNECTED =
+            "android.hardware.action.USB_DISCONNECTED";
+
+   /**
+     * Broadcast Action:  A sticky broadcast for USB state change events.
+     *
+     * This is a sticky broadcast for clients that are interested in both USB connect and
+     * disconnect events.  If you are only concerned with one or the other, you can use
+     * {@link #ACTION_USB_CONNECTED} or {@link #ACTION_USB_DISCONNECTED} to avoid receiving
+     * unnecessary broadcasts.  The boolean {@link #USB_CONNECTED} extra indicates whether
+     * USB is connected or disconnected.
+     * The extras bundle will also contain name/value pairs with the name of the function
+     * and a value of either {@link #USB_FUNCTION_ENABLED} or {@link #USB_FUNCTION_DISABLED}.
+     * Possible USB function names include {@link #USB_FUNCTION_MASS_STORAGE},
+     * {@link #USB_FUNCTION_ADB}, {@link #USB_FUNCTION_RNDIS} and {@link #USB_FUNCTION_MTP}.
+     */
+    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.
+     */
+    public static final String USB_CONNECTED = "connected";
+
+    /**
+     * Name of the USB mass storage USB function.
+     * Used in extras for the {@link #ACTION_USB_CONNECTED} broadcast
+     */
+    public static final String USB_FUNCTION_MASS_STORAGE = "mass_storage";
+
+    /**
+     * Name of the adb USB function.
+     * Used in extras for the {@link #ACTION_USB_CONNECTED} broadcast
+     */
+    public static final String USB_FUNCTION_ADB = "adb";
+
+    /**
+     * Name of the RNDIS ethernet USB function.
+     * Used in extras for the {@link #ACTION_USB_CONNECTED} broadcast
+     */
+    public static final String USB_FUNCTION_RNDIS = "rndis";
+
+    /**
+     * Name of the MTP USB function.
+     * Used in extras for the {@link #ACTION_USB_CONNECTED} broadcast
+     */
+    public static final String USB_FUNCTION_MTP = "mtp";
+
+    /**
+     * Value indicating that a USB function is enabled.
+     * Used in extras for the {@link #ACTION_USB_CONNECTED} broadcast
+     */
+    public static final String USB_FUNCTION_ENABLED = "enabled";
+
+    /**
+     * Value indicating that a USB function is disabled.
+     * 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;
+        }
+    }
+}