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 <nativehelper/JNIHelp.h>
22#include "android_runtime/AndroidRuntime.h"
23#include "android_runtime/Log.h"
24#include "MtpDescriptors.h"
25
26#include <stdio.h>
27#include <asm/byteorder.h>
28#include <sys/types.h>
29#include <sys/stat.h>
30#include <fcntl.h>
31#include <sys/ioctl.h>
32#include <linux/usb/f_accessory.h>
33
34#define DRIVER_NAME "/dev/usb_accessory"
35
36namespace android
37{
38
39static struct parcel_file_descriptor_offsets_t
40{
41    jclass mClass;
42    jmethodID mConstructor;
43} gParcelFileDescriptorOffsets;
44
45static void set_accessory_string(JNIEnv *env, int fd, int cmd, jobjectArray strArray, int index)
46{
47    char buffer[256];
48
49    buffer[0] = 0;
50    ioctl(fd, cmd, buffer);
51    if (buffer[0]) {
52        jstring obj = env->NewStringUTF(buffer);
53        env->SetObjectArrayElement(strArray, index, obj);
54        env->DeleteLocalRef(obj);
55    }
56}
57
58
59static jobjectArray android_server_UsbDeviceManager_getAccessoryStrings(JNIEnv *env,
60                                                                        jobject /* thiz */)
61{
62    int fd = open(DRIVER_NAME, O_RDWR);
63    if (fd < 0) {
64        ALOGE("could not open %s", DRIVER_NAME);
65        return NULL;
66    }
67    jclass stringClass = env->FindClass("java/lang/String");
68    jobjectArray strArray = env->NewObjectArray(6, stringClass, NULL);
69    if (!strArray) goto out;
70    set_accessory_string(env, fd, ACCESSORY_GET_STRING_MANUFACTURER, strArray, 0);
71    set_accessory_string(env, fd, ACCESSORY_GET_STRING_MODEL, strArray, 1);
72    set_accessory_string(env, fd, ACCESSORY_GET_STRING_DESCRIPTION, strArray, 2);
73    set_accessory_string(env, fd, ACCESSORY_GET_STRING_VERSION, strArray, 3);
74    set_accessory_string(env, fd, ACCESSORY_GET_STRING_URI, strArray, 4);
75    set_accessory_string(env, fd, ACCESSORY_GET_STRING_SERIAL, strArray, 5);
76
77out:
78    close(fd);
79    return strArray;
80}
81
82static jobject android_server_UsbDeviceManager_openAccessory(JNIEnv *env, jobject /* thiz */)
83{
84    int fd = open(DRIVER_NAME, O_RDWR);
85    if (fd < 0) {
86        ALOGE("could not open %s", DRIVER_NAME);
87        return NULL;
88    }
89    jobject fileDescriptor = jniCreateFileDescriptor(env, fd);
90    if (fileDescriptor == NULL) {
91        return NULL;
92    }
93    return env->NewObject(gParcelFileDescriptorOffsets.mClass,
94        gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
95}
96
97static jboolean android_server_UsbDeviceManager_isStartRequested(JNIEnv* /* env */,
98                                                                 jobject /* thiz */)
99{
100    int fd = open(DRIVER_NAME, O_RDWR);
101    if (fd < 0) {
102        ALOGE("could not open %s", DRIVER_NAME);
103        return false;
104    }
105    int result = ioctl(fd, ACCESSORY_IS_START_REQUESTED);
106    close(fd);
107    return (result == 1);
108}
109
110static jint android_server_UsbDeviceManager_getAudioMode(JNIEnv* /* env */, jobject /* thiz */)
111{
112    int fd = open(DRIVER_NAME, O_RDWR);
113    if (fd < 0) {
114        ALOGE("could not open %s", DRIVER_NAME);
115        return false;
116    }
117    int result = ioctl(fd, ACCESSORY_GET_AUDIO_MODE);
118    close(fd);
119    return result;
120}
121
122static jobject android_server_UsbDeviceManager_openControl(JNIEnv *env, jobject /* thiz */, jstring jFunction) {
123    const char *function = env->GetStringUTFChars(jFunction, NULL);
124    bool ptp = false;
125    int fd = -1;
126    if (!strcmp(function, "ptp")) {
127        ptp = true;
128    }
129    if (!strcmp(function, "mtp") || ptp) {
130        fd = TEMP_FAILURE_RETRY(open(ptp ? FFS_PTP_EP0 : FFS_MTP_EP0, O_RDWR));
131        if (fd < 0) {
132            ALOGE("could not open control for %s %s", function, strerror(errno));
133            goto error;
134        }
135        if (!writeDescriptors(fd, ptp)) {
136            goto error;
137        }
138    }
139
140    if (function != NULL) {
141        env->ReleaseStringUTFChars(jFunction, function);
142    }
143    return jniCreateFileDescriptor(env, fd);
144error:
145    if (fd != -1) {
146        close(fd);
147    }
148    if (function != NULL) {
149        env->ReleaseStringUTFChars(jFunction, function);
150    }
151    return NULL;
152}
153
154static const JNINativeMethod method_table[] = {
155    { "nativeGetAccessoryStrings",  "()[Ljava/lang/String;",
156                                    (void*)android_server_UsbDeviceManager_getAccessoryStrings },
157    { "nativeOpenAccessory",        "()Landroid/os/ParcelFileDescriptor;",
158                                    (void*)android_server_UsbDeviceManager_openAccessory },
159    { "nativeIsStartRequested",     "()Z",
160                                    (void*)android_server_UsbDeviceManager_isStartRequested },
161    { "nativeGetAudioMode",         "()I",
162                                    (void*)android_server_UsbDeviceManager_getAudioMode },
163    { "nativeOpenControl",          "(Ljava/lang/String;)Ljava/io/FileDescriptor;",
164                                    (void*)android_server_UsbDeviceManager_openControl },
165};
166
167int register_android_server_UsbDeviceManager(JNIEnv *env)
168{
169    jclass clazz = env->FindClass("com/android/server/usb/UsbDeviceManager");
170    if (clazz == NULL) {
171        ALOGE("Can't find com/android/server/usb/UsbDeviceManager");
172        return -1;
173    }
174
175    clazz = env->FindClass("android/os/ParcelFileDescriptor");
176    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
177    gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
178    gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>", "(Ljava/io/FileDescriptor;)V");
179    LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
180                 "Unable to find constructor for android.os.ParcelFileDescriptor");
181
182    return jniRegisterNativeMethods(env, "com/android/server/usb/UsbDeviceManager",
183            method_table, NELEM(method_table));
184}
185
186};
187