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 "UsbHostManagerJNI"
18 #include "utils/Log.h"
19
20 #include "jni.h"
21 #include <nativehelper/JNIPlatformHelp.h>
22 #include "android_runtime/AndroidRuntime.h"
23 #include "android_runtime/Log.h"
24
25 #include <stdio.h>
26 #include <sys/types.h>
27 #include <sys/stat.h>
28 #include <fcntl.h>
29 #include <sys/ioctl.h>
30
31 #include <usbhost/usbhost.h>
32
33 namespace android
34 {
35
36 static struct parcel_file_descriptor_offsets_t
37 {
38 jclass mClass;
39 jmethodID mConstructor;
40 } gParcelFileDescriptorOffsets;
41
42 static jmethodID method_usbDeviceAdded;
43 static jmethodID method_usbDeviceRemoved;
44
checkAndClearExceptionFromCallback(JNIEnv * env,const char * methodName)45 static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
46 if (env->ExceptionCheck()) {
47 ALOGE("An exception was thrown by callback '%s'.", methodName);
48 LOGE_EX(env);
49 env->ExceptionClear();
50 }
51 }
52
usb_device_added(const char * devAddress,void * clientData)53 static int usb_device_added(const char *devAddress, void* clientData) {
54 struct usb_device *device = usb_device_open(devAddress);
55 if (!device) {
56 ALOGE("usb_device_open failed\n");
57 return 0;
58 }
59
60 const usb_device_descriptor* deviceDesc = usb_device_get_device_descriptor(device);
61 int classID = deviceDesc->bDeviceClass;
62 int subClassID = deviceDesc->bDeviceSubClass;
63
64 // get the raw descriptors
65 int numBytes = usb_device_get_descriptors_length(device);
66 if (numBytes > 0) {
67 JNIEnv* env = AndroidRuntime::getJNIEnv();
68 jobject thiz = (jobject)clientData;
69 jstring deviceAddress = env->NewStringUTF(devAddress);
70
71 jbyteArray descriptorsArray = env->NewByteArray(numBytes);
72 const jbyte* rawDescriptors = (const jbyte*)usb_device_get_raw_descriptors(device);
73 env->SetByteArrayRegion(descriptorsArray, 0, numBytes, rawDescriptors);
74
75 env->CallBooleanMethod(thiz, method_usbDeviceAdded,
76 deviceAddress, classID, subClassID, descriptorsArray);
77
78 env->DeleteLocalRef(descriptorsArray);
79 env->DeleteLocalRef(deviceAddress);
80
81 checkAndClearExceptionFromCallback(env, __FUNCTION__);
82 } else {
83 // TODO return an error code here?
84 ALOGE("error reading descriptors\n");
85 }
86
87 usb_device_close(device);
88
89 return 0;
90 }
91
usb_device_removed(const char * devAddress,void * clientData)92 static int usb_device_removed(const char *devAddress, void* clientData) {
93 JNIEnv* env = AndroidRuntime::getJNIEnv();
94 jobject thiz = (jobject)clientData;
95
96 jstring deviceAddress = env->NewStringUTF(devAddress);
97 env->CallVoidMethod(thiz, method_usbDeviceRemoved, deviceAddress);
98 env->DeleteLocalRef(deviceAddress);
99 checkAndClearExceptionFromCallback(env, __FUNCTION__);
100 return 0;
101 }
102
android_server_UsbHostManager_monitorUsbHostBus(JNIEnv *,jobject thiz)103 static void android_server_UsbHostManager_monitorUsbHostBus(JNIEnv* /* env */, jobject thiz)
104 {
105 struct usb_host_context* context = usb_host_init();
106 if (!context) {
107 ALOGE("usb_host_init failed");
108 return;
109 }
110 // this will never return so it is safe to pass thiz directly
111 usb_host_run(context, usb_device_added, usb_device_removed, NULL, (void *)thiz);
112 }
113
android_server_UsbHostManager_openDevice(JNIEnv * env,jobject,jstring deviceAddress)114 static jobject android_server_UsbHostManager_openDevice(JNIEnv *env, jobject /* thiz */,
115 jstring deviceAddress)
116 {
117 const char *deviceAddressStr = env->GetStringUTFChars(deviceAddress, NULL);
118 struct usb_device* device = usb_device_open(deviceAddressStr);
119 env->ReleaseStringUTFChars(deviceAddress, deviceAddressStr);
120
121 if (!device)
122 return NULL;
123
124 int fd = usb_device_get_fd(device);
125 if (fd < 0) {
126 usb_device_close(device);
127 return NULL;
128 }
129 int newFD = dup(fd);
130 usb_device_close(device);
131
132 jobject fileDescriptor = jniCreateFileDescriptor(env, newFD);
133 if (fileDescriptor == NULL) {
134 close(newFD);
135 return NULL;
136 }
137 return env->NewObject(gParcelFileDescriptorOffsets.mClass,
138 gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
139 }
140
141 static const JNINativeMethod method_table[] = {
142 { "monitorUsbHostBus", "()V", (void*)android_server_UsbHostManager_monitorUsbHostBus },
143 { "nativeOpenDevice", "(Ljava/lang/String;)Landroid/os/ParcelFileDescriptor;",
144 (void*)android_server_UsbHostManager_openDevice },
145 };
146
register_android_server_UsbHostManager(JNIEnv * env)147 int register_android_server_UsbHostManager(JNIEnv *env)
148 {
149 jclass clazz = env->FindClass("com/android/server/usb/UsbHostManager");
150 if (clazz == NULL) {
151 ALOGE("Can't find com/android/server/usb/UsbHostManager");
152 return -1;
153 }
154 method_usbDeviceAdded =
155 env->GetMethodID(clazz, "usbDeviceAdded", "(Ljava/lang/String;II[B)Z");
156 if (method_usbDeviceAdded == NULL) {
157 ALOGE("Can't find beginUsbDeviceAdded");
158 return -1;
159 }
160 method_usbDeviceRemoved = env->GetMethodID(clazz, "usbDeviceRemoved",
161 "(Ljava/lang/String;)V");
162 if (method_usbDeviceRemoved == NULL) {
163 ALOGE("Can't find usbDeviceRemoved");
164 return -1;
165 }
166
167 clazz = env->FindClass("android/os/ParcelFileDescriptor");
168 LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
169 gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
170 gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>",
171 "(Ljava/io/FileDescriptor;)V");
172 LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
173 "Unable to find constructor for android.os.ParcelFileDescriptor");
174
175 return jniRegisterNativeMethods(env, "com/android/server/usb/UsbHostManager",
176 method_table, NELEM(method_table));
177 }
178
179 };
180