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/*
* 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 "JNIHelp.h"
#include "android_runtime/AndroidRuntime.h"
#include "utils/Vector.h"
#include <usbhost/usbhost.h>
#include <stdio.h>
#include <asm/byteorder.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
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()) {
LOGE("An exception was thrown by callback '%s'.", methodName);
LOGE_EX(env);
env->ExceptionClear();
}
}
static int usb_device_added(const char *devname, void* client_data) {
struct usb_descriptor_header* desc;
struct usb_descriptor_iter iter;
struct usb_device *device = usb_device_open(devname);
if (!device) {
LOGE("usb_device_open failed\n");
return 0;
}
JNIEnv* env = AndroidRuntime::getJNIEnv();
jobject thiz = (jobject)client_data;
Vector<int> interfaceValues;
Vector<int> endpointValues;
const usb_device_descriptor* deviceDesc = usb_device_get_device_descriptor(device);
uint16_t vendorId = usb_device_get_vendor_id(device);
uint16_t productId = usb_device_get_product_id(device);
uint8_t deviceClass = deviceDesc->bDeviceClass;
uint8_t deviceSubClass = deviceDesc->bDeviceSubClass;
uint8_t protocol = deviceDesc->bDeviceProtocol;
usb_descriptor_iter_init(device, &iter);
while ((desc = usb_descriptor_iter_next(&iter)) != NULL) {
if (desc->bDescriptorType == USB_DT_INTERFACE) {
struct usb_interface_descriptor *interface = (struct usb_interface_descriptor *)desc;
// push class, subclass, protocol and number of endpoints into interfaceValues vector
interfaceValues.add(interface->bInterfaceNumber);
interfaceValues.add(interface->bInterfaceClass);
interfaceValues.add(interface->bInterfaceSubClass);
interfaceValues.add(interface->bInterfaceProtocol);
interfaceValues.add(interface->bNumEndpoints);
} else if (desc->bDescriptorType == USB_DT_ENDPOINT) {
struct usb_endpoint_descriptor *endpoint = (struct usb_endpoint_descriptor *)desc;
// push address, attributes, max packet size and interval into endpointValues vector
endpointValues.add(endpoint->bEndpointAddress);
endpointValues.add(endpoint->bmAttributes);
endpointValues.add(__le16_to_cpu(endpoint->wMaxPacketSize));
endpointValues.add(endpoint->bInterval);
}
}
usb_device_close(device);
// handle generic device notification
int length = interfaceValues.size();
jintArray interfaceArray = env->NewIntArray(length);
env->SetIntArrayRegion(interfaceArray, 0, length, interfaceValues.array());
length = endpointValues.size();
jintArray endpointArray = env->NewIntArray(length);
env->SetIntArrayRegion(endpointArray, 0, length, endpointValues.array());
jstring deviceName = env->NewStringUTF(devname);
env->CallVoidMethod(thiz, method_usbDeviceAdded,
deviceName, vendorId, productId, deviceClass,
deviceSubClass, protocol, interfaceArray, endpointArray);
env->DeleteLocalRef(interfaceArray);
env->DeleteLocalRef(endpointArray);
env->DeleteLocalRef(deviceName);
checkAndClearExceptionFromCallback(env, __FUNCTION__);
return 0;
}
static int usb_device_removed(const char *devname, void* client_data) {
JNIEnv* env = AndroidRuntime::getJNIEnv();
jobject thiz = (jobject)client_data;
jstring deviceName = env->NewStringUTF(devname);
env->CallVoidMethod(thiz, method_usbDeviceRemoved, deviceName);
env->DeleteLocalRef(deviceName);
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) {
LOGE("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 deviceName)
{
const char *deviceNameStr = env->GetStringUTFChars(deviceName, NULL);
struct usb_device* device = usb_device_open(deviceNameStr);
env->ReleaseStringUTFChars(deviceName, deviceNameStr);
if (!device)
return NULL;
int fd = usb_device_get_fd(device);
if (fd < 0)
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 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) {
LOGE("Can't find com/android/server/usb/UsbHostManager");
return -1;
}
method_usbDeviceAdded = env->GetMethodID(clazz, "usbDeviceAdded", "(Ljava/lang/String;IIIII[I[I)V");
if (method_usbDeviceAdded == NULL) {
LOGE("Can't find usbDeviceAdded");
return -1;
}
method_usbDeviceRemoved = env->GetMethodID(clazz, "usbDeviceRemoved", "(Ljava/lang/String;)V");
if (method_usbDeviceRemoved == NULL) {
LOGE("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));
}
};
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