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 36 namespace android 37 { 38 39 static struct parcel_file_descriptor_offsets_t 40 { 41 jclass mClass; 42 jmethodID mConstructor; 43 } gParcelFileDescriptorOffsets; 44 45 static 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 59 static 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 77 out: 78 close(fd); 79 return strArray; 80 } 81 82 static 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 97 static 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 } 109 110 static 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 } 121 122 static 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); 144 error: 145 if (fd != -1) { 146 close(fd); 147 } 148 if (function != NULL) { 149 env->ReleaseStringUTFChars(jFunction, function); 150 } 151 return NULL; 152 } 153 154 static 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 }; 166 167 int 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
