1 files changed, 157 insertions, 0 deletions
diff --git a/services/core/jni/com_android_server_UsbDeviceManager.cpp b/services/core/jni/com_android_server_UsbDeviceManager.cpp
new file mode 100644
index 0000000..3551733
--- /dev/null
+++ b/services/core/jni/com_android_server_UsbDeviceManager.cpp
@@ -0,0 +1,157 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "UsbDeviceManagerJNI"
+#include "utils/Log.h"
+
+#include "jni.h"
+#include "JNIHelp.h"
+#include "android_runtime/AndroidRuntime.h"
+#include "android_runtime/Log.h"
+
+#include <stdio.h>
+#include <asm/byteorder.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/usb/f_accessory.h>
+
+#define DRIVER_NAME "/dev/usb_accessory"
+
+namespace android
+{
+
+static struct parcel_file_descriptor_offsets_t
+{
+    jclass mClass;
+    jmethodID mConstructor;
+} gParcelFileDescriptorOffsets;
+
+static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
+    if (env->ExceptionCheck()) {
+        ALOGE("An exception was thrown by callback '%s'.", methodName);
+        LOGE_EX(env);
+        env->ExceptionClear();
+    }
+}
+
+static void set_accessory_string(JNIEnv *env, int fd, int cmd, jobjectArray strArray, int index)
+{
+    char buffer[256];
+
+    buffer[0] = 0;
+    int length = ioctl(fd, cmd, buffer);
+    if (buffer[0]) {
+        jstring obj = env->NewStringUTF(buffer);
+        env->SetObjectArrayElement(strArray, index, obj);
+        env->DeleteLocalRef(obj);
+    }
+}
+
+
+static jobjectArray android_server_UsbDeviceManager_getAccessoryStrings(JNIEnv *env, jobject thiz)
+{
+    int fd = open(DRIVER_NAME, O_RDWR);
+    if (fd < 0) {
+        ALOGE("could not open %s", DRIVER_NAME);
+        return NULL;
+    }
+    jclass stringClass = env->FindClass("java/lang/String");
+    jobjectArray strArray = env->NewObjectArray(6, stringClass, NULL);
+    if (!strArray) goto out;
+    set_accessory_string(env, fd, ACCESSORY_GET_STRING_MANUFACTURER, strArray, 0);
+    set_accessory_string(env, fd, ACCESSORY_GET_STRING_MODEL, strArray, 1);
+    set_accessory_string(env, fd, ACCESSORY_GET_STRING_DESCRIPTION, strArray, 2);
+    set_accessory_string(env, fd, ACCESSORY_GET_STRING_VERSION, strArray, 3);
+    set_accessory_string(env, fd, ACCESSORY_GET_STRING_URI, strArray, 4);
+    set_accessory_string(env, fd, ACCESSORY_GET_STRING_SERIAL, strArray, 5);
+
+out:
+    close(fd);
+    return strArray;
+}
+
+static jobject android_server_UsbDeviceManager_openAccessory(JNIEnv *env, jobject thiz)
+{
+    int fd = open(DRIVER_NAME, O_RDWR);
+    if (fd < 0) {
+        ALOGE("could not open %s", DRIVER_NAME);
+        return NULL;
+    }
+    jobject fileDescriptor = jniCreateFileDescriptor(env, fd);
+    if (fileDescriptor == NULL) {
+        return NULL;
+    }
+    return env->NewObject(gParcelFileDescriptorOffsets.mClass,
+        gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
+}
+
+static jboolean android_server_UsbDeviceManager_isStartRequested(JNIEnv *env, jobject thiz)
+{
+    int fd = open(DRIVER_NAME, O_RDWR);
+    if (fd < 0) {
+        ALOGE("could not open %s", DRIVER_NAME);
+        return false;
+    }
+    int result = ioctl(fd, ACCESSORY_IS_START_REQUESTED);
+    close(fd);
+    return (result == 1);
+}
+
+static jint android_server_UsbDeviceManager_getAudioMode(JNIEnv *env, jobject thiz)
+{
+    int fd = open(DRIVER_NAME, O_RDWR);
+    if (fd < 0) {
+        ALOGE("could not open %s", DRIVER_NAME);
+        return false;
+    }
+    int result = ioctl(fd, ACCESSORY_GET_AUDIO_MODE);
+    close(fd);
+    return result;
+}
+
+static JNINativeMethod method_table[] = {
+    { "nativeGetAccessoryStrings",  "()[Ljava/lang/String;",
+                                    (void*)android_server_UsbDeviceManager_getAccessoryStrings },
+    { "nativeOpenAccessory",        "()Landroid/os/ParcelFileDescriptor;",
+                                    (void*)android_server_UsbDeviceManager_openAccessory },
+    { "nativeIsStartRequested",     "()Z",
+                                    (void*)android_server_UsbDeviceManager_isStartRequested },
+    { "nativeGetAudioMode",         "()I",
+                                    (void*)android_server_UsbDeviceManager_getAudioMode },
+};
+
+int register_android_server_UsbDeviceManager(JNIEnv *env)
+{
+    jclass clazz = env->FindClass("com/android/server/usb/UsbDeviceManager");
+    if (clazz == NULL) {
+        ALOGE("Can't find com/android/server/usb/UsbDeviceManager");
+        return -1;
+    }
+
+    clazz = env->FindClass("android/os/ParcelFileDescriptor");
+    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
+    gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
+    gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>", "(Ljava/io/FileDescriptor;)V");
+    LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
+                 "Unable to find constructor for android.os.ParcelFileDescriptor");
+
+    return jniRegisterNativeMethods(env, "com/android/server/usb/UsbDeviceManager",
+            method_table, NELEM(method_table));
+}
+
+};