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 35 namespace android 36 { 37 38 static struct parcel_file_descriptor_offsets_t 39 { 40 jclass mClass; 41 jmethodID mConstructor; 42 } gParcelFileDescriptorOffsets; 43 44 static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) { 45 if (env->ExceptionCheck()) { 46 ALOGE("An exception was thrown by callback '%s'.", methodName); 47 LOGE_EX(env); 48 env->ExceptionClear(); 49 } 50 } 51 52 static void set_accessory_string(JNIEnv *env, int fd, int cmd, jobjectArray strArray, int index) 53 { 54 char buffer[256]; 55 56 buffer[0] = 0; 57 int length = ioctl(fd, cmd, buffer); 58 if (buffer[0]) { 59 jstring obj = env->NewStringUTF(buffer); 60 env->SetObjectArrayElement(strArray, index, obj); 61 env->DeleteLocalRef(obj); 62 } 63 } 64 65 66 static jobjectArray android_server_UsbDeviceManager_getAccessoryStrings(JNIEnv *env, jobject thiz) 67 { 68 int fd = open(DRIVER_NAME, O_RDWR); 69 if (fd < 0) { 70 ALOGE("could not open %s", DRIVER_NAME); 71 return NULL; 72 } 73 jclass stringClass = env->FindClass("java/lang/String"); 74 jobjectArray strArray = env->NewObjectArray(6, stringClass, NULL); 75 if (!strArray) goto out; 76 set_accessory_string(env, fd, ACCESSORY_GET_STRING_MANUFACTURER, strArray, 0); 77 set_accessory_string(env, fd, ACCESSORY_GET_STRING_MODEL, strArray, 1); 78 set_accessory_string(env, fd, ACCESSORY_GET_STRING_DESCRIPTION, strArray, 2); 79 set_accessory_string(env, fd, ACCESSORY_GET_STRING_VERSION, strArray, 3); 80 set_accessory_string(env, fd, ACCESSORY_GET_STRING_URI, strArray, 4); 81 set_accessory_string(env, fd, ACCESSORY_GET_STRING_SERIAL, strArray, 5); 82 83 out: 84 close(fd); 85 return strArray; 86 } 87 88 static jobject android_server_UsbDeviceManager_openAccessory(JNIEnv *env, jobject thiz) 89 { 90 int fd = open(DRIVER_NAME, O_RDWR); 91 if (fd < 0) { 92 ALOGE("could not open %s", DRIVER_NAME); 93 return NULL; 94 } 95 jobject fileDescriptor = jniCreateFileDescriptor(env, fd); 96 if (fileDescriptor == NULL) { 97 return NULL; 98 } 99 return env->NewObject(gParcelFileDescriptorOffsets.mClass, 100 gParcelFileDescriptorOffsets.mConstructor, fileDescriptor); 101 } 102 103 static jboolean android_server_UsbDeviceManager_isStartRequested(JNIEnv *env, jobject thiz) 104 { 105 int fd = open(DRIVER_NAME, O_RDWR); 106 if (fd < 0) { 107 ALOGE("could not open %s", DRIVER_NAME); 108 return false; 109 } 110 int result = ioctl(fd, ACCESSORY_IS_START_REQUESTED); 111 close(fd); 112 return (result == 1); 113 } 114 115 static jint android_server_UsbDeviceManager_getAudioMode(JNIEnv *env, jobject thiz) 116 { 117 int fd = open(DRIVER_NAME, O_RDWR); 118 if (fd < 0) { 119 ALOGE("could not open %s", DRIVER_NAME); 120 return false; 121 } 122 int result = ioctl(fd, ACCESSORY_GET_AUDIO_MODE); 123 close(fd); 124 return result; 125 } 126 127 static JNINativeMethod method_table[] = { 128 { "nativeGetAccessoryStrings", "()[Ljava/lang/String;", 129 (void*)android_server_UsbDeviceManager_getAccessoryStrings }, 130 { "nativeOpenAccessory", "()Landroid/os/ParcelFileDescriptor;", 131 (void*)android_server_UsbDeviceManager_openAccessory }, 132 { "nativeIsStartRequested", "()Z", 133 (void*)android_server_UsbDeviceManager_isStartRequested }, 134 { "nativeGetAudioMode", "()I", 135 (void*)android_server_UsbDeviceManager_getAudioMode }, 136 }; 137 138 int register_android_server_UsbDeviceManager(JNIEnv *env) 139 { 140 jclass clazz = env->FindClass("com/android/server/usb/UsbDeviceManager"); 141 if (clazz == NULL) { 142 ALOGE("Can't find com/android/server/usb/UsbDeviceManager"); 143 return -1; 144 } 145 146 clazz = env->FindClass("android/os/ParcelFileDescriptor"); 147 LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor"); 148 gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz); 149 gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>", "(Ljava/io/FileDescriptor;)V"); 150 LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL, 151 "Unable to find constructor for android.os.ParcelFileDescriptor"); 152 153 return jniRegisterNativeMethods(env, "com/android/server/usb/UsbDeviceManager", 154 method_table, NELEM(method_table)); 155 } 156 157 }; 158
