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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 "UsbDeviceManagerJNI"
#include "utils/Log.h"
#include "jni.h"
#include "JNIHelp.h"
#include "android_runtime/AndroidRuntime.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 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_UsbDeviceManager_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_UsbDeviceManager_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 = jniCreateFileDescriptor(env, fd);
if (fileDescriptor == NULL) {
return NULL;
}
return env->NewObject(gParcelFileDescriptorOffsets.mClass,
gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
}
static jboolean android_server_UsbDeviceManager_isStartRequested(JNIEnv *env, jobject thiz)
{
int fd = open(DRIVER_NAME, O_RDWR);
if (fd < 0) {
LOGE("could not open %s", DRIVER_NAME);
return false;
}
int result = ioctl(fd, ACCESSORY_IS_START_REQUESTED);
close(fd);
return (result == 1);
}
static JNINativeMethod method_table[] = {
{ "nativeGetAccessoryStrings", "()[Ljava/lang/String;",
(void*)android_server_UsbDeviceManager_getAccessoryStrings },
{ "nativeOpenAccessory", "()Landroid/os/ParcelFileDescriptor;",
(void*)android_server_UsbDeviceManager_openAccessory },
{ "nativeIsStartRequested", "()Z",
(void*)android_server_UsbDeviceManager_isStartRequested },
};
int register_android_server_UsbDeviceManager(JNIEnv *env)
{
jclass clazz = env->FindClass("com/android/server/usb/UsbDeviceManager");
if (clazz == NULL) {
LOGE("Can't find com/android/server/usb/UsbDeviceManager");
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/UsbDeviceManager",
method_table, NELEM(method_table));
}
};
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