| /* |
| * 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 "UsbHostManagerJNI" |
| #include "utils/Log.h" |
| |
| #include "jni.h" |
| #include <nativehelper/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 <usbhost/usbhost.h> |
| |
| #define MAX_DESCRIPTORS_LENGTH 4096 |
| |
| namespace android |
| { |
| |
| static struct parcel_file_descriptor_offsets_t |
| { |
| jclass mClass; |
| jmethodID mConstructor; |
| } gParcelFileDescriptorOffsets; |
| |
| static jmethodID method_usbDeviceAdded; |
| static jmethodID method_usbDeviceRemoved; |
| |
| 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 int usb_device_added(const char *devAddress, void* clientData) { |
| struct usb_device *device = usb_device_open(devAddress); |
| if (!device) { |
| ALOGE("usb_device_open failed\n"); |
| return 0; |
| } |
| |
| const usb_device_descriptor* deviceDesc = usb_device_get_device_descriptor(device); |
| int classID = deviceDesc->bDeviceClass; |
| int subClassID = deviceDesc->bDeviceSubClass; |
| |
| // get the raw descriptors |
| int numBytes = usb_device_get_descriptors_length(device); |
| if (numBytes > 0) { |
| JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| jobject thiz = (jobject)clientData; |
| jstring deviceAddress = env->NewStringUTF(devAddress); |
| |
| jbyteArray descriptorsArray = env->NewByteArray(numBytes); |
| const jbyte* rawDescriptors = (const jbyte*)usb_device_get_raw_descriptors(device); |
| env->SetByteArrayRegion(descriptorsArray, 0, numBytes, rawDescriptors); |
| |
| env->CallBooleanMethod(thiz, method_usbDeviceAdded, |
| deviceAddress, classID, subClassID, descriptorsArray); |
| |
| env->DeleteLocalRef(descriptorsArray); |
| env->DeleteLocalRef(deviceAddress); |
| |
| checkAndClearExceptionFromCallback(env, __FUNCTION__); |
| } else { |
| // TODO return an error code here? |
| ALOGE("error reading descriptors\n"); |
| } |
| |
| usb_device_close(device); |
| |
| return 0; |
| } |
| |
| static int usb_device_removed(const char *devAddress, void* clientData) { |
| JNIEnv* env = AndroidRuntime::getJNIEnv(); |
| jobject thiz = (jobject)clientData; |
| |
| jstring deviceAddress = env->NewStringUTF(devAddress); |
| env->CallVoidMethod(thiz, method_usbDeviceRemoved, deviceAddress); |
| env->DeleteLocalRef(deviceAddress); |
| checkAndClearExceptionFromCallback(env, __FUNCTION__); |
| return 0; |
| } |
| |
| static void android_server_UsbHostManager_monitorUsbHostBus(JNIEnv* /* env */, jobject thiz) |
| { |
| struct usb_host_context* context = usb_host_init(); |
| if (!context) { |
| ALOGE("usb_host_init failed"); |
| return; |
| } |
| // this will never return so it is safe to pass thiz directly |
| usb_host_run(context, usb_device_added, usb_device_removed, NULL, (void *)thiz); |
| } |
| |
| static jobject android_server_UsbHostManager_openDevice(JNIEnv *env, jobject /* thiz */, |
| jstring deviceAddress) |
| { |
| const char *deviceAddressStr = env->GetStringUTFChars(deviceAddress, NULL); |
| struct usb_device* device = usb_device_open(deviceAddressStr); |
| env->ReleaseStringUTFChars(deviceAddress, deviceAddressStr); |
| |
| if (!device) |
| return NULL; |
| |
| int fd = usb_device_get_fd(device); |
| if (fd < 0) { |
| usb_device_close(device); |
| return NULL; |
| } |
| int newFD = dup(fd); |
| usb_device_close(device); |
| |
| jobject fileDescriptor = jniCreateFileDescriptor(env, newFD); |
| if (fileDescriptor == NULL) { |
| return NULL; |
| } |
| return env->NewObject(gParcelFileDescriptorOffsets.mClass, |
| gParcelFileDescriptorOffsets.mConstructor, fileDescriptor); |
| } |
| |
| static const JNINativeMethod method_table[] = { |
| { "monitorUsbHostBus", "()V", (void*)android_server_UsbHostManager_monitorUsbHostBus }, |
| { "nativeOpenDevice", "(Ljava/lang/String;)Landroid/os/ParcelFileDescriptor;", |
| (void*)android_server_UsbHostManager_openDevice }, |
| }; |
| |
| int register_android_server_UsbHostManager(JNIEnv *env) |
| { |
| jclass clazz = env->FindClass("com/android/server/usb/UsbHostManager"); |
| if (clazz == NULL) { |
| ALOGE("Can't find com/android/server/usb/UsbHostManager"); |
| return -1; |
| } |
| method_usbDeviceAdded = |
| env->GetMethodID(clazz, "usbDeviceAdded", "(Ljava/lang/String;II[B)Z"); |
| if (method_usbDeviceAdded == NULL) { |
| ALOGE("Can't find beginUsbDeviceAdded"); |
| return -1; |
| } |
| method_usbDeviceRemoved = env->GetMethodID(clazz, "usbDeviceRemoved", |
| "(Ljava/lang/String;)V"); |
| if (method_usbDeviceRemoved == NULL) { |
| ALOGE("Can't find usbDeviceRemoved"); |
| 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/UsbHostManager", |
| method_table, NELEM(method_table)); |
| } |
| |
| }; |