（1）添加文件 frameworks/base/services/core/jni/com_android_server_switch_SwitchusbAction.cpp com_android_server_switch_SwitchusbAction.cpp

/*
 * 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.
 */

#define LOG_TAG "LightsService"

#include "jni.h"
#include <nativehelper/JNIHelp.h>
//#include "android_runtime/AndroidRuntime.h"

#include <utils/misc.h>
#include <utils/Log.h>
#include <hardware/hardware.h>
#include <hardware/lights.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>


#define SWITCH_USB_MAGIC 'k'  //当然我们也可以定义一个相应的头文件，把ioctl的cmd放进里面，然后再include进 来
#define SWITCH_USB_OFF    _IO(SWITCH_USB_MAGIC,0x1A)    // OFF
#define SWITCH_USB_ON     _IO(SWITCH_USB_MAGIC,0x1B)    // ON


int switchusb_fd=-1;


namespace android
{



static jint SwitchUsbOpen_native(JNIEnv* /* env */, jobject /* clazz */)
{


       // int cmd=0;
        //int arg =0;
        switchusb_fd=open("/dev/switchusb",O_RDWR);
        if(switchusb_fd==-1)
        {
            printf("open switchusb fail\r\n");
            return -1;
        }
/*
       if(ioctl(fd,OPEN,&arg)<0)
        {
          printf("ioctl action fail");
           return -3;

        }
*/

        return 0;

}



static jint SwitchUsbWrite_native(JNIEnv* /* env */, jobject /* clazz */,jint value)
{
    return 0;
}

static jint SwitchUsbIoctl_native(JNIEnv* /* env */, jobject /* clazz */,jint cmd ,jint value)
{
    printf("ddy ioctl action 进来了么");
        int arg =value;

       if(cmd==0)
       {
            if(ioctl(switchusb_fd,SWITCH_USB_OFF,&arg)<0)
            {
                printf("ioctl action fail");
                return -3;

            }
       }
       else
       {
            if(ioctl(switchusb_fd,SWITCH_USB_ON,&arg)<0)
            {
                printf("ioctl action fail");
                return -3;

            }
       }
   return 0;
    
}



static const JNINativeMethod method_table[] = {
    { "nativeSwitchUsbActionOpen", "()I", (void*)SwitchUsbOpen_native },
    { "nativeSwitchUsbActionWrite", "(I)I", (void*)SwitchUsbWrite_native },
    { "nativeSwitchUsbActionIoctl", "(II)I", (void*)SwitchUsbIoctl_native },
};




int register_android_server_SwitchUsb(JNIEnv *env)
{
    return jniRegisterNativeMethods(env, "com/android/server/SwitchUsbAction",
            method_table, NELEM(method_table));
}

};

（2）修改onload.cpp

----------------- frameworks/base/services/core/jni/onload.cpp -----------------
index 5d6ab96704..3db96d7c5b 100755
@@ -72,6 +72,8 @@ int register_android_server_RtcAlarmPowerOn(JNIEnv* env);
 int register_android_server_VendorStorage(JNIEnv* env);
 int register_android_server_utils_HdpkeyLoader(JNIEnv* env);
 int register_android_server_utils_HdmiService(JNIEnv* env);
+int register_android_server_SwitchUsb(JNIEnv* env);
+
 };
 
 using namespace android;
@@ -137,5 +139,6 @@ extern "C" jint JNI_OnLoad(JavaVM* vm, void* /* reserved */)
     register_android_server_VendorStorage(env);
     register_android_server_utils_HdpkeyLoader(env);
     register_android_server_utils_HdmiService(env);
+    register_android_server_SwitchUsb(env);
     return JNI_VERSION_1_4;
 }

（3）修改Android.bp 文件，使添加的com_android_server_switch_SwitchusbAction.cpp编译进来

----------------- frameworks/base/services/core/jni/Android.bp -----------------
index 1fae787539..e98d6c446d 100755
@@ -66,6 +66,7 @@ cc_library_static {
         "com_android_server_VendorStorage.cpp",
         "com_android_server_utils_HdpkeyLoader.cpp",
         "com_android_server_utils_HdmiService.cpp",
+        "com_android_server_switch_SwitchusbAction.cpp",
         "onload.cpp",
         ":lib_networkStatsFactory_native",
     ],

（4）添加aidl 文件frameworks/base/core/java/android/os/ISwitchUsbAction.aidl

---------- frameworks/base/core/java/android/os/ISwitchUsbAction.aidl ----------
new file mode 100644
index 0000000000..16c6ec3d56
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2012 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.os;
+
+/**
+ * Direct interface to the UpdateLockService's functionality
+ *
+ * {@hide}
+ */
+interface ISwitchUsbAction {
+    int SwitchUsbActionOpen();
+    int SwitchUsbActionWrite(int value);
+    int SwitchUsbActionIoctl(int cmd, int value);
+}

（5）添加JAVA文件与JNI 接口链接上如下SwitchUsbAction.java

-- frameworks/base/services/core/java/com/android/server/SwitchUsbAction.java --
new file mode 100644
index 0000000000..85640c9572
@@ -0,0 +1,42 @@
+package com.android.server;
+ 
+import android.util.Slog;
+import android.os.ISwitchUsbAction;
+import android.content.Context;
+
+public class SwitchUsbAction extends ISwitchUsbAction.Stub{
+    private static final String TAG = "SwitchUsbAction";
+    
+    private final Context mContext;
+    public static final String SWITCH_USB_STATS_SERVICE = "switchusbaction";
+
+    public SwitchUsbAction(Context context) 
+    {
+        Slog.d(TAG,"SwitchUsbAction");
+        mContext = context;
+    }
+    
+    @Override
+    public int SwitchUsbActionOpen() throws android.os.RemoteException
+    {
+        return nativeSwitchUsbActionOpen();
+    }
+
+
+    @Override
+    public int SwitchUsbActionWrite(int value) throws android.os.RemoteException
+    {
+        return nativeSwitchUsbActionWrite(value);
+    }
+
+    @Override
+    public int SwitchUsbActionIoctl(int cmd, int value) throws android.os.RemoteException
+    {
+        return nativeSwitchUsbActionIoctl(cmd,value);
+    }
+
+
+    public static native int nativeSwitchUsbActionOpen();
+    public static native int nativeSwitchUsbActionWrite(int value);
+    public static native int nativeSwitchUsbActionIoctl(int cmd,int value);
+}

（6）最后修改下权限如下init.connectivity.rc文件：

----------------- device/rockchip/common/init.connectivity.rc -----------------
index 113e242d09..341686b96d 100644
@@ -30,6 +30,7 @@ on zygote-start
     chmod 0664 /dev/vendor_storage
     chmod 0664 /sys/touchscreen/glove
     chmod 0664 /sys/devices/platform/fe8a0000.usb2-phy/otg_mode
+    chmod 0664 /dev/switchusb
     chown bluetooth net_bt /dev/vflash
     chown bluetooth net_bt /dev/vendor_storage

@@ -46,6 +47,7 @@ on zygote-start
     chown system system /sys/touchscreen/glove
     chown system system /sys/devices/platform/fe8a0000.usb2-phy/otg_mode
     chown system system /sys/class/boe_dev/boe_amp_dev/amplifier_control
+    chown system system /dev/switchusb