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
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
35 namespace android
36 {
37
38 static struct parcel_file_descriptor_offsets_t
39 {
40 jclass mClass;
41 jmethodID mConstructor;
42 } gParcelFileDescriptorOffsets;
43
set_accessory_string(JNIEnv * env,int fd,int cmd,jobjectArray strArray,int index)44 static 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
android_server_UsbDeviceManager_getAccessoryStrings(JNIEnv * env,jobject)58 static 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
76 out:
77 close(fd);
78 return strArray;
79 }
80
android_server_UsbDeviceManager_openAccessory(JNIEnv * env,jobject)81 static 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
android_server_UsbDeviceManager_isStartRequested(JNIEnv *,jobject)96 static 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
android_server_UsbDeviceManager_getAudioMode(JNIEnv *,jobject)109 static 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
121 static 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
register_android_server_UsbDeviceManager(JNIEnv * env)132 int 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