diff options
Diffstat (limited to 'services/jni/com_android_server_UsbService.cpp')
-rw-r--r-- | services/jni/com_android_server_UsbService.cpp | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/services/jni/com_android_server_UsbService.cpp b/services/jni/com_android_server_UsbService.cpp new file mode 100644 index 0000000..92c5008 --- /dev/null +++ b/services/jni/com_android_server_UsbService.cpp @@ -0,0 +1,141 @@ +/* + * 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 "UsbService" +#include "utils/Log.h" + +#include "jni.h" +#include "JNIHelp.h" +#include "android_runtime/AndroidRuntime.h" +#include "utils/Vector.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 file_descriptor_offsets_t +{ + jclass mClass; + jmethodID mConstructor; + jfieldID mDescriptor; +} gFileDescriptorOffsets; + +static struct parcel_file_descriptor_offsets_t +{ + jclass mClass; + jmethodID mConstructor; +} gParcelFileDescriptorOffsets; + +static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) { + if (env->ExceptionCheck()) { + LOGE("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_UsbService_getAccessoryStrings(JNIEnv *env, jobject thiz) +{ + int fd = open(DRIVER_NAME, O_RDWR); + if (fd < 0) { + LOGE("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_UsbService_openAccessory(JNIEnv *env, jobject thiz) +{ + int fd = open(DRIVER_NAME, O_RDWR); + if (fd < 0) { + LOGE("could not open %s", DRIVER_NAME); + return NULL; + } + jobject fileDescriptor = env->NewObject(gFileDescriptorOffsets.mClass, + gFileDescriptorOffsets.mConstructor); + if (fileDescriptor != NULL) { + env->SetIntField(fileDescriptor, gFileDescriptorOffsets.mDescriptor, fd); + } else { + return NULL; + } + return env->NewObject(gParcelFileDescriptorOffsets.mClass, + gParcelFileDescriptorOffsets.mConstructor, fileDescriptor); +} + +static JNINativeMethod method_table[] = { + { "nativeGetAccessoryStrings", "()[Ljava/lang/String;", + (void*)android_server_UsbService_getAccessoryStrings }, + { "nativeOpenAccessory","()Landroid/os/ParcelFileDescriptor;", + (void*)android_server_UsbService_openAccessory }, +}; + +int register_android_server_UsbService(JNIEnv *env) +{ + jclass clazz = env->FindClass("java/io/FileDescriptor"); + LOG_FATAL_IF(clazz == NULL, "Unable to find class java.io.FileDescriptor"); + gFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz); + gFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>", "()V"); + gFileDescriptorOffsets.mDescriptor = env->GetFieldID(clazz, "descriptor", "I"); + LOG_FATAL_IF(gFileDescriptorOffsets.mDescriptor == NULL, + "Unable to find descriptor field in java.io.FileDescriptor"); + + 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/UsbService", + method_table, NELEM(method_table)); +} + +}; |