/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "UsbHostManagerJNI"
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#include "utils/Log.h"
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#include "jni.h"
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#include <nativehelper/JNIHelp.h>
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#include "android_runtime/AndroidRuntime.h"
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#include "android_runtime/Log.h"
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#include <stdio.h>
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#include <asm/byteorder.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <usbhost/usbhost.h>
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#define MAX_DESCRIPTORS_LENGTH 4096
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namespace android
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{
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static struct parcel_file_descriptor_offsets_t
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{
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jclass mClass;
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jmethodID mConstructor;
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} gParcelFileDescriptorOffsets;
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static jmethodID method_usbDeviceAdded;
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static jmethodID method_usbDeviceRemoved;
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static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
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if (env->ExceptionCheck()) {
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ALOGE("An exception was thrown by callback '%s'.", methodName);
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LOGE_EX(env);
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env->ExceptionClear();
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}
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}
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static int usb_device_added(const char *devAddress, void* clientData) {
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struct usb_device *device = usb_device_open(devAddress);
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if (!device) {
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ALOGE("usb_device_open failed\n");
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return 0;
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}
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const usb_device_descriptor* deviceDesc = usb_device_get_device_descriptor(device);
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int classID = deviceDesc->bDeviceClass;
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int subClassID = deviceDesc->bDeviceSubClass;
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// get the raw descriptors
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int numBytes = usb_device_get_descriptors_length(device);
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if (numBytes > 0) {
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JNIEnv* env = AndroidRuntime::getJNIEnv();
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jobject thiz = (jobject)clientData;
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jstring deviceAddress = env->NewStringUTF(devAddress);
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jbyteArray descriptorsArray = env->NewByteArray(numBytes);
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const jbyte* rawDescriptors = (const jbyte*)usb_device_get_raw_descriptors(device);
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env->SetByteArrayRegion(descriptorsArray, 0, numBytes, rawDescriptors);
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env->CallBooleanMethod(thiz, method_usbDeviceAdded,
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deviceAddress, classID, subClassID, descriptorsArray);
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env->DeleteLocalRef(descriptorsArray);
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env->DeleteLocalRef(deviceAddress);
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checkAndClearExceptionFromCallback(env, __FUNCTION__);
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} else {
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// TODO return an error code here?
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ALOGE("error reading descriptors\n");
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}
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usb_device_close(device);
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return 0;
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}
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static int usb_device_removed(const char *devAddress, void* clientData) {
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JNIEnv* env = AndroidRuntime::getJNIEnv();
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jobject thiz = (jobject)clientData;
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jstring deviceAddress = env->NewStringUTF(devAddress);
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env->CallVoidMethod(thiz, method_usbDeviceRemoved, deviceAddress);
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env->DeleteLocalRef(deviceAddress);
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checkAndClearExceptionFromCallback(env, __FUNCTION__);
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return 0;
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}
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static void android_server_UsbHostManager_monitorUsbHostBus(JNIEnv* /* env */, jobject thiz)
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{
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struct usb_host_context* context = usb_host_init();
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if (!context) {
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ALOGE("usb_host_init failed");
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return;
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}
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// this will never return so it is safe to pass thiz directly
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usb_host_run(context, usb_device_added, usb_device_removed, NULL, (void *)thiz);
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}
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static jobject android_server_UsbHostManager_openDevice(JNIEnv *env, jobject /* thiz */,
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jstring deviceAddress)
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{
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const char *deviceAddressStr = env->GetStringUTFChars(deviceAddress, NULL);
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struct usb_device* device = usb_device_open(deviceAddressStr);
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env->ReleaseStringUTFChars(deviceAddress, deviceAddressStr);
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if (!device)
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return NULL;
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int fd = usb_device_get_fd(device);
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if (fd < 0) {
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usb_device_close(device);
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return NULL;
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}
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int newFD = dup(fd);
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usb_device_close(device);
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jobject fileDescriptor = jniCreateFileDescriptor(env, newFD);
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if (fileDescriptor == NULL) {
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return NULL;
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}
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return env->NewObject(gParcelFileDescriptorOffsets.mClass,
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gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
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}
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static const JNINativeMethod method_table[] = {
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{ "monitorUsbHostBus", "()V", (void*)android_server_UsbHostManager_monitorUsbHostBus },
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{ "nativeOpenDevice", "(Ljava/lang/String;)Landroid/os/ParcelFileDescriptor;",
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(void*)android_server_UsbHostManager_openDevice },
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};
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int register_android_server_UsbHostManager(JNIEnv *env)
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{
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jclass clazz = env->FindClass("com/android/server/usb/UsbHostManager");
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if (clazz == NULL) {
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ALOGE("Can't find com/android/server/usb/UsbHostManager");
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return -1;
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}
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method_usbDeviceAdded =
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env->GetMethodID(clazz, "usbDeviceAdded", "(Ljava/lang/String;II[B)Z");
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if (method_usbDeviceAdded == NULL) {
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ALOGE("Can't find beginUsbDeviceAdded");
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return -1;
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}
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method_usbDeviceRemoved = env->GetMethodID(clazz, "usbDeviceRemoved",
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"(Ljava/lang/String;)V");
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if (method_usbDeviceRemoved == NULL) {
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ALOGE("Can't find usbDeviceRemoved");
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return -1;
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}
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clazz = env->FindClass("android/os/ParcelFileDescriptor");
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LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
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gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
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gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>",
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"(Ljava/io/FileDescriptor;)V");
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LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
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"Unable to find constructor for android.os.ParcelFileDescriptor");
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return jniRegisterNativeMethods(env, "com/android/server/usb/UsbHostManager",
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method_table, NELEM(method_table));
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}
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};
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