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 34 namespace android 35 { 36 37 static struct parcel_file_descriptor_offsets_t 38 { 39 jclass mClass; 40 jmethodID mConstructor; 41 } gParcelFileDescriptorOffsets; 42 43 static 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 51 static 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 65 static 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 82 out: 83 close(fd); 84 return strArray; 85 } 86 87 static 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 } 101 102 static 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 } 113 114 static 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 } 125 126 static 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 }; 136 137 int 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