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#include "android_runtime/Log.h"
24
25#include <stdio.h>
26#include <asm/byteorder.h>
27#include <sys/types.h>
28#include <sys/stat.h>
29#include <fcntl.h>
30#include <sys/ioctl.h>
31#include <linux/usb/f_accessory.h>
32
33#define DRIVER_NAME "/dev/usb_accessory"
34
35namespace android
36{
37
38static struct parcel_file_descriptor_offsets_t
39{
40    jclass mClass;
41    jmethodID mConstructor;
42} gParcelFileDescriptorOffsets;
43
44static void set_accessory_string(JNIEnv *env, int fd, int cmd, jobjectArray strArray, int index)
45{
46    char buffer[256];
47
48    buffer[0] = 0;
49    ioctl(fd, cmd, buffer);
50    if (buffer[0]) {
51        jstring obj = env->NewStringUTF(buffer);
52        env->SetObjectArrayElement(strArray, index, obj);
53        env->DeleteLocalRef(obj);
54    }
55}
56
57
58static jobjectArray android_server_UsbDeviceManager_getAccessoryStrings(JNIEnv *env,
59                                                                        jobject /* thiz */)
60{
61    int fd = open(DRIVER_NAME, O_RDWR);
62    if (fd < 0) {
63        ALOGE("could not open %s", DRIVER_NAME);
64        return NULL;
65    }
66    jclass stringClass = env->FindClass("java/lang/String");
67    jobjectArray strArray = env->NewObjectArray(6, stringClass, NULL);
68    if (!strArray) goto out;
69    set_accessory_string(env, fd, ACCESSORY_GET_STRING_MANUFACTURER, strArray, 0);
70    set_accessory_string(env, fd, ACCESSORY_GET_STRING_MODEL, strArray, 1);
71    set_accessory_string(env, fd, ACCESSORY_GET_STRING_DESCRIPTION, strArray, 2);
72    set_accessory_string(env, fd, ACCESSORY_GET_STRING_VERSION, strArray, 3);
73    set_accessory_string(env, fd, ACCESSORY_GET_STRING_URI, strArray, 4);
74    set_accessory_string(env, fd, ACCESSORY_GET_STRING_SERIAL, strArray, 5);
75
76out:
77    close(fd);
78    return strArray;
79}
80
81static jobject android_server_UsbDeviceManager_openAccessory(JNIEnv *env, jobject /* thiz */)
82{
83    int fd = open(DRIVER_NAME, O_RDWR);
84    if (fd < 0) {
85        ALOGE("could not open %s", DRIVER_NAME);
86        return NULL;
87    }
88    jobject fileDescriptor = jniCreateFileDescriptor(env, fd);
89    if (fileDescriptor == NULL) {
90        return NULL;
91    }
92    return env->NewObject(gParcelFileDescriptorOffsets.mClass,
93        gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
94}
95
96static jboolean android_server_UsbDeviceManager_isStartRequested(JNIEnv* /* env */,
97                                                                 jobject /* thiz */)
98{
99    int fd = open(DRIVER_NAME, O_RDWR);
100    if (fd < 0) {
101        ALOGE("could not open %s", DRIVER_NAME);
102        return false;
103    }
104    int result = ioctl(fd, ACCESSORY_IS_START_REQUESTED);
105    close(fd);
106    return (result == 1);
107}
108
109static jint android_server_UsbDeviceManager_getAudioMode(JNIEnv* /* env */, jobject /* thiz */)
110{
111    int fd = open(DRIVER_NAME, O_RDWR);
112    if (fd < 0) {
113        ALOGE("could not open %s", DRIVER_NAME);
114        return false;
115    }
116    int result = ioctl(fd, ACCESSORY_GET_AUDIO_MODE);
117    close(fd);
118    return result;
119}
120
121static const JNINativeMethod method_table[] = {
122    { "nativeGetAccessoryStrings",  "()[Ljava/lang/String;",
123                                    (void*)android_server_UsbDeviceManager_getAccessoryStrings },
124    { "nativeOpenAccessory",        "()Landroid/os/ParcelFileDescriptor;",
125                                    (void*)android_server_UsbDeviceManager_openAccessory },
126    { "nativeIsStartRequested",     "()Z",
127                                    (void*)android_server_UsbDeviceManager_isStartRequested },
128    { "nativeGetAudioMode",         "()I",
129                                    (void*)android_server_UsbDeviceManager_getAudioMode },
130};
131
132int register_android_server_UsbDeviceManager(JNIEnv *env)
133{
134    jclass clazz = env->FindClass("com/android/server/usb/UsbDeviceManager");
135    if (clazz == NULL) {
136        ALOGE("Can't find com/android/server/usb/UsbDeviceManager");
137        return -1;
138    }
139
140    clazz = env->FindClass("android/os/ParcelFileDescriptor");
141    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
142    gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
143    gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>", "(Ljava/io/FileDescriptor;)V");
144    LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
145                 "Unable to find constructor for android.os.ParcelFileDescriptor");
146
147    return jniRegisterNativeMethods(env, "com/android/server/usb/UsbDeviceManager",
148            method_table, NELEM(method_table));
149}
150
151};
152