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 <asm/byteorder.h>
27 #include <sys/types.h>
28 #include <sys/stat.h>
29 #include <fcntl.h>
30 #include <sys/ioctl.h>
31
32 #include <usbhost/usbhost.h>
33
34 #define MAX_DESCRIPTORS_LENGTH 4096
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 jmethodID method_usbDeviceAdded;
46 static jmethodID method_usbDeviceRemoved;
47
checkAndClearExceptionFromCallback(JNIEnv * env,const char * methodName)48 static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
49 if (env->ExceptionCheck()) {
50 ALOGE("An exception was thrown by callback '%s'.", methodName);
51 LOGE_EX(env);
52 env->ExceptionClear();
53 }
54 }
55
usb_device_added(const char * devAddress,void * clientData)56 static int usb_device_added(const char *devAddress, void* clientData) {
57 struct usb_device *device = usb_device_open(devAddress);
58 if (!device) {
59 ALOGE("usb_device_open failed\n");
60 return 0;
61 }
62
63 const usb_device_descriptor* deviceDesc = usb_device_get_device_descriptor(device);
64 int classID = deviceDesc->bDeviceClass;
65 int subClassID = deviceDesc->bDeviceSubClass;
66
67 // get the raw descriptors
68 int numBytes = usb_device_get_descriptors_length(device);
69 if (numBytes > 0) {
70 JNIEnv* env = AndroidRuntime::getJNIEnv();
71 jobject thiz = (jobject)clientData;
72 jstring deviceAddress = env->NewStringUTF(devAddress);
73
74 jbyteArray descriptorsArray = env->NewByteArray(numBytes);
75 const jbyte* rawDescriptors = (const jbyte*)usb_device_get_raw_descriptors(device);
76 env->SetByteArrayRegion(descriptorsArray, 0, numBytes, rawDescriptors);
77
78 env->CallBooleanMethod(thiz, method_usbDeviceAdded,
79 deviceAddress, classID, subClassID, descriptorsArray);
80
81 env->DeleteLocalRef(descriptorsArray);
82 env->DeleteLocalRef(deviceAddress);
83
84 checkAndClearExceptionFromCallback(env, __FUNCTION__);
85 } else {
86 // TODO return an error code here?
87 ALOGE("error reading descriptors\n");
88 }
89
90 usb_device_close(device);
91
92 return 0;
93 }
94
usb_device_removed(const char * devAddress,void * clientData)95 static int usb_device_removed(const char *devAddress, void* clientData) {
96 JNIEnv* env = AndroidRuntime::getJNIEnv();
97 jobject thiz = (jobject)clientData;
98
99 jstring deviceAddress = env->NewStringUTF(devAddress);
100 env->CallVoidMethod(thiz, method_usbDeviceRemoved, deviceAddress);
101 env->DeleteLocalRef(deviceAddress);
102 checkAndClearExceptionFromCallback(env, __FUNCTION__);
103 return 0;
104 }
105
android_server_UsbHostManager_monitorUsbHostBus(JNIEnv *,jobject thiz)106 static void android_server_UsbHostManager_monitorUsbHostBus(JNIEnv* /* env */, jobject thiz)
107 {
108 struct usb_host_context* context = usb_host_init();
109 if (!context) {
110 ALOGE("usb_host_init failed");
111 return;
112 }
113 // this will never return so it is safe to pass thiz directly
114 usb_host_run(context, usb_device_added, usb_device_removed, NULL, (void *)thiz);
115 }
116
android_server_UsbHostManager_openDevice(JNIEnv * env,jobject,jstring deviceAddress)117 static jobject android_server_UsbHostManager_openDevice(JNIEnv *env, jobject /* thiz */,
118 jstring deviceAddress)
119 {
120 const char *deviceAddressStr = env->GetStringUTFChars(deviceAddress, NULL);
121 struct usb_device* device = usb_device_open(deviceAddressStr);
122 env->ReleaseStringUTFChars(deviceAddress, deviceAddressStr);
123
124 if (!device)
125 return NULL;
126
127 int fd = usb_device_get_fd(device);
128 if (fd < 0) {
129 usb_device_close(device);
130 return NULL;
131 }
132 int newFD = dup(fd);
133 usb_device_close(device);
134
135 jobject fileDescriptor = jniCreateFileDescriptor(env, newFD);
136 if (fileDescriptor == NULL) {
137 close(newFD);
138 return NULL;
139 }
140 return env->NewObject(gParcelFileDescriptorOffsets.mClass,
141 gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
142 }
143
144 static const JNINativeMethod method_table[] = {
145 { "monitorUsbHostBus", "()V", (void*)android_server_UsbHostManager_monitorUsbHostBus },
146 { "nativeOpenDevice", "(Ljava/lang/String;)Landroid/os/ParcelFileDescriptor;",
147 (void*)android_server_UsbHostManager_openDevice },
148 };
149
register_android_server_UsbHostManager(JNIEnv * env)150 int register_android_server_UsbHostManager(JNIEnv *env)
151 {
152 jclass clazz = env->FindClass("com/android/server/usb/UsbHostManager");
153 if (clazz == NULL) {
154 ALOGE("Can't find com/android/server/usb/UsbHostManager");
155 return -1;
156 }
157 method_usbDeviceAdded =
158 env->GetMethodID(clazz, "usbDeviceAdded", "(Ljava/lang/String;II[B)Z");
159 if (method_usbDeviceAdded == NULL) {
160 ALOGE("Can't find beginUsbDeviceAdded");
161 return -1;
162 }
163 method_usbDeviceRemoved = env->GetMethodID(clazz, "usbDeviceRemoved",
164 "(Ljava/lang/String;)V");
165 if (method_usbDeviceRemoved == NULL) {
166 ALOGE("Can't find usbDeviceRemoved");
167 return -1;
168 }
169
170 clazz = env->FindClass("android/os/ParcelFileDescriptor");
171 LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
172 gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
173 gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>",
174 "(Ljava/io/FileDescriptor;)V");
175 LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
176 "Unable to find constructor for android.os.ParcelFileDescriptor");
177
178 return jniRegisterNativeMethods(env, "com/android/server/usb/UsbHostManager",
179 method_table, NELEM(method_table));
180 }
181
182 };
183