/*
* 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 "UsbRequestJNI"
#include "utils/Log.h"
#include "jni.h"
#include <nativehelper/JNIHelp.h>
#include "core_jni_helpers.h"
#include <usbhost/usbhost.h>
#include <stdio.h>
using namespace android;
static jfieldID field_context;
struct usb_request* get_request_from_object(JNIEnv* env, jobject java_request)
{
return (struct usb_request*)env->GetLongField(java_request, field_context);
}
// in android_hardware_UsbDeviceConnection.cpp
extern struct usb_device* get_device_from_object(JNIEnv* env, jobject connection);
static jboolean
android_hardware_UsbRequest_init(JNIEnv *env, jobject thiz, jobject java_device,
jint ep_address, jint ep_attributes, jint ep_max_packet_size, jint ep_interval)
{
ALOGD("init\n");
struct usb_device* device = get_device_from_object(env, java_device);
if (!device) {
ALOGE("device null in native_init");
return JNI_FALSE;
}
// construct an endpoint descriptor from the Java object fields
struct usb_endpoint_descriptor desc;
desc.bLength = USB_DT_ENDPOINT_SIZE;
desc.bDescriptorType = USB_DT_ENDPOINT;
desc.bEndpointAddress = ep_address;
desc.bmAttributes = ep_attributes;
desc.wMaxPacketSize = ep_max_packet_size;
desc.bInterval = ep_interval;
struct usb_request* request = usb_request_new(device, &desc);
if (request)
env->SetLongField(thiz, field_context, (jlong)request);
return (request != NULL);
}
static void
android_hardware_UsbRequest_close(JNIEnv *env, jobject thiz)
{
ALOGD("close\n");
struct usb_request* request = get_request_from_object(env, thiz);
if (request) {
usb_request_free(request);
env->SetLongField(thiz, field_context, 0);
}
}
static jboolean
android_hardware_UsbRequest_queue_array(JNIEnv *env, jobject thiz,
jbyteArray buffer, jint length, jboolean out)
{
struct usb_request* request = get_request_from_object(env, thiz);
if (!request) {
ALOGE("request is closed in native_queue");
return JNI_FALSE;
}
if (buffer && length) {
request->buffer = malloc(length);
if (!request->buffer)
return JNI_FALSE;
memset(request->buffer, 0, length);
if (out) {
// copy data from Java buffer to native buffer
env->GetByteArrayRegion(buffer, 0, length, (jbyte *)request->buffer);
}
} else {
request->buffer = NULL;
}
request->buffer_length = length;
// save a reference to ourselves so UsbDeviceConnection.waitRequest() can find us
request->client_data = (void *)env->NewGlobalRef(thiz);
if (usb_request_queue(request)) {
if (request->buffer) {
// free our buffer if usb_request_queue fails
free(request->buffer);
request->buffer = NULL;
}
env->DeleteGlobalRef((jobject)request->client_data);
return JNI_FALSE;
}
return JNI_TRUE;
}
static jint
android_hardware_UsbRequest_dequeue_array(JNIEnv *env, jobject thiz,
jbyteArray buffer, jint length, jboolean out)
{
struct usb_request* request = get_request_from_object(env, thiz);
if (!request) {
ALOGE("request is closed in native_dequeue");
return (jint) -1;
}
if (buffer && length && request->buffer && !out) {
// copy data from native buffer to Java buffer
env->SetByteArrayRegion(buffer, 0, length, (jbyte *)request->buffer);
}
free(request->buffer);
env->DeleteGlobalRef((jobject)request->client_data);
return (jint) request->actual_length;
}
static jboolean
android_hardware_UsbRequest_queue_direct(JNIEnv *env, jobject thiz,
jobject buffer, jint length, jboolean out)
{
struct usb_request* request = get_request_from_object(env, thiz);
if (!request) {
ALOGE("request is closed in native_queue");
return JNI_FALSE;
}
if (buffer && length) {
request->buffer = env->GetDirectBufferAddress(buffer);
if (!request->buffer)
return JNI_FALSE;
} else {
request->buffer = NULL;
}
request->buffer_length = length;
// save a reference to ourselves so UsbDeviceConnection.waitRequest() can find us
// we also need this to make sure our native buffer is not deallocated
// while IO is active
request->client_data = (void *)env->NewGlobalRef(thiz);
if (usb_request_queue(request)) {
request->buffer = NULL;
env->DeleteGlobalRef((jobject)request->client_data);
return JNI_FALSE;
}
return JNI_TRUE;
}
static jboolean
android_hardware_UsbRequest_queue(JNIEnv *env, jobject thiz, jobject buffer, jint offset,
jint length)
{
struct usb_request* request = get_request_from_object(env, thiz);
if (!request) {
ALOGE("request is closed in native_queue");
return JNI_FALSE;
}
if (buffer == NULL) {
request->buffer = NULL;
request->buffer_length = 0;
} else {
request->buffer = (void *)((char *)env->GetDirectBufferAddress(buffer) + offset);
request->buffer_length = length;
}
// Save a reference to ourselves so UsbDeviceConnection.waitRequest() can find us.
// We also need this to make sure our native buffer is not deallocated while IO is active.
request->client_data = (void *)env->NewGlobalRef(thiz);
int err = usb_request_queue(request);
if (err != 0) {
request->buffer = NULL;
env->DeleteGlobalRef((jobject)request->client_data);
return JNI_FALSE;
}
return JNI_TRUE;
}
static jint
android_hardware_UsbRequest_dequeue_direct(JNIEnv *env, jobject thiz)
{
struct usb_request* request = get_request_from_object(env, thiz);
if (!request) {
ALOGE("request is closed in native_dequeue");
return (jint) -1;
}
// all we need to do is delete our global ref
env->DeleteGlobalRef((jobject)request->client_data);
return (jint) request->actual_length;
}
static jboolean
android_hardware_UsbRequest_cancel(JNIEnv *env, jobject thiz)
{
struct usb_request* request = get_request_from_object(env, thiz);
if (!request) {
ALOGE("request is closed in native_cancel");
return JNI_FALSE;
}
return (usb_request_cancel(request) == 0);
}
static const JNINativeMethod method_table[] = {
{"native_init", "(Landroid/hardware/usb/UsbDeviceConnection;IIII)Z",
(void *)android_hardware_UsbRequest_init},
{"native_close", "()V", (void *)android_hardware_UsbRequest_close},
{"native_queue", "(Ljava/nio/ByteBuffer;II)Z",
(void *)android_hardware_UsbRequest_queue},
{"native_queue_array", "([BIZ)Z", (void *)android_hardware_UsbRequest_queue_array},
{"native_dequeue_array", "([BIZ)I", (void *)android_hardware_UsbRequest_dequeue_array},
{"native_queue_direct", "(Ljava/nio/ByteBuffer;IZ)Z",
(void *)android_hardware_UsbRequest_queue_direct},
{"native_dequeue_direct", "()I", (void *)android_hardware_UsbRequest_dequeue_direct},
{"native_cancel", "()Z", (void *)android_hardware_UsbRequest_cancel},
};
int register_android_hardware_UsbRequest(JNIEnv *env)
{
jclass clazz = env->FindClass("android/hardware/usb/UsbRequest");
if (clazz == NULL) {
ALOGE("Can't find android/hardware/usb/UsbRequest");
return -1;
}
field_context = env->GetFieldID(clazz, "mNativeContext", "J");
if (field_context == NULL) {
ALOGE("Can't find UsbRequest.mNativeContext");
return -1;
}
return RegisterMethodsOrDie(env, "android/hardware/usb/UsbRequest",
method_table, NELEM(method_table));
}