1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "UsbDeviceManagerJNI"
18#include "utils/Log.h"
19
20#include "jni.h"
21#include "JNIHelp.h"
22#include "android_runtime/AndroidRuntime.h"
23
24#include <stdio.h>
25#include <asm/byteorder.h>
26#include <sys/types.h>
27#include <sys/stat.h>
28#include <fcntl.h>
29#include <sys/ioctl.h>
30#include <linux/usb/f_accessory.h>
31
32#define DRIVER_NAME "/dev/usb_accessory"
33
34namespace android
35{
36
37static struct parcel_file_descriptor_offsets_t
38{
39    jclass mClass;
40    jmethodID mConstructor;
41} gParcelFileDescriptorOffsets;
42
43static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
44    if (env->ExceptionCheck()) {
45        ALOGE("An exception was thrown by callback '%s'.", methodName);
46        LOGE_EX(env);
47        env->ExceptionClear();
48    }
49}
50
51static void set_accessory_string(JNIEnv *env, int fd, int cmd, jobjectArray strArray, int index)
52{
53    char buffer[256];
54
55    buffer[0] = 0;
56    int length = ioctl(fd, cmd, buffer);
57    if (buffer[0]) {
58        jstring obj = env->NewStringUTF(buffer);
59        env->SetObjectArrayElement(strArray, index, obj);
60        env->DeleteLocalRef(obj);
61    }
62}
63
64
65static jobjectArray android_server_UsbDeviceManager_getAccessoryStrings(JNIEnv *env, jobject thiz)
66{
67    int fd = open(DRIVER_NAME, O_RDWR);
68    if (fd < 0) {
69        ALOGE("could not open %s", DRIVER_NAME);
70        return NULL;
71    }
72    jclass stringClass = env->FindClass("java/lang/String");
73    jobjectArray strArray = env->NewObjectArray(6, stringClass, NULL);
74    if (!strArray) goto out;
75    set_accessory_string(env, fd, ACCESSORY_GET_STRING_MANUFACTURER, strArray, 0);
76    set_accessory_string(env, fd, ACCESSORY_GET_STRING_MODEL, strArray, 1);
77    set_accessory_string(env, fd, ACCESSORY_GET_STRING_DESCRIPTION, strArray, 2);
78    set_accessory_string(env, fd, ACCESSORY_GET_STRING_VERSION, strArray, 3);
79    set_accessory_string(env, fd, ACCESSORY_GET_STRING_URI, strArray, 4);
80    set_accessory_string(env, fd, ACCESSORY_GET_STRING_SERIAL, strArray, 5);
81
82out:
83    close(fd);
84    return strArray;
85}
86
87static jobject android_server_UsbDeviceManager_openAccessory(JNIEnv *env, jobject thiz)
88{
89    int fd = open(DRIVER_NAME, O_RDWR);
90    if (fd < 0) {
91        ALOGE("could not open %s", DRIVER_NAME);
92        return NULL;
93    }
94    jobject fileDescriptor = jniCreateFileDescriptor(env, fd);
95    if (fileDescriptor == NULL) {
96        return NULL;
97    }
98    return env->NewObject(gParcelFileDescriptorOffsets.mClass,
99        gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
100}
101
102static jboolean android_server_UsbDeviceManager_isStartRequested(JNIEnv *env, jobject thiz)
103{
104    int fd = open(DRIVER_NAME, O_RDWR);
105    if (fd < 0) {
106        ALOGE("could not open %s", DRIVER_NAME);
107        return false;
108    }
109    int result = ioctl(fd, ACCESSORY_IS_START_REQUESTED);
110    close(fd);
111    return (result == 1);
112}
113
114static jint android_server_UsbDeviceManager_getAudioMode(JNIEnv *env, jobject thiz)
115{
116    int fd = open(DRIVER_NAME, O_RDWR);
117    if (fd < 0) {
118        ALOGE("could not open %s", DRIVER_NAME);
119        return false;
120    }
121    int result = ioctl(fd, ACCESSORY_GET_AUDIO_MODE);
122    close(fd);
123    return result;
124}
125
126static JNINativeMethod method_table[] = {
127    { "nativeGetAccessoryStrings",  "()[Ljava/lang/String;",
128                                    (void*)android_server_UsbDeviceManager_getAccessoryStrings },
129    { "nativeOpenAccessory",        "()Landroid/os/ParcelFileDescriptor;",
130                                    (void*)android_server_UsbDeviceManager_openAccessory },
131    { "nativeIsStartRequested",     "()Z",
132                                    (void*)android_server_UsbDeviceManager_isStartRequested },
133    { "nativeGetAudioMode",         "()I",
134                                    (void*)android_server_UsbDeviceManager_getAudioMode },
135};
136
137int register_android_server_UsbDeviceManager(JNIEnv *env)
138{
139    jclass clazz = env->FindClass("com/android/server/usb/UsbDeviceManager");
140    if (clazz == NULL) {
141        ALOGE("Can't find com/android/server/usb/UsbDeviceManager");
142        return -1;
143    }
144
145    clazz = env->FindClass("android/os/ParcelFileDescriptor");
146    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
147    gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
148    gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>", "(Ljava/io/FileDescriptor;)V");
149    LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
150                 "Unable to find constructor for android.os.ParcelFileDescriptor");
151
152    return jniRegisterNativeMethods(env, "com/android/server/usb/UsbDeviceManager",
153            method_table, NELEM(method_table));
154}
155
156};
157