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 "JNIHelp.h"
22 #include "android_runtime/AndroidRuntime.h"
23 #include "utils/Vector.h"
24
25 #include <usbhost/usbhost.h>
26
27 #include <stdio.h>
28 #include <asm/byteorder.h>
29 #include <sys/types.h>
30 #include <sys/stat.h>
31 #include <fcntl.h>
32 #include <sys/ioctl.h>
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 jmethodID method_usbDeviceAdded;
44 static jmethodID method_usbDeviceRemoved;
45
checkAndClearExceptionFromCallback(JNIEnv * env,const char * methodName)46 static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
47 if (env->ExceptionCheck()) {
48 ALOGE("An exception was thrown by callback '%s'.", methodName);
49 LOGE_EX(env);
50 env->ExceptionClear();
51 }
52 }
53
usb_device_added(const char * devname,void * client_data)54 static int usb_device_added(const char *devname, void* client_data) {
55 struct usb_descriptor_header* desc;
56 struct usb_descriptor_iter iter;
57
58 struct usb_device *device = usb_device_open(devname);
59 if (!device) {
60 ALOGE("usb_device_open failed\n");
61 return 0;
62 }
63
64 JNIEnv* env = AndroidRuntime::getJNIEnv();
65 jobject thiz = (jobject)client_data;
66 Vector<int> interfaceValues;
67 Vector<int> endpointValues;
68 const usb_device_descriptor* deviceDesc = usb_device_get_device_descriptor(device);
69
70 uint16_t vendorId = usb_device_get_vendor_id(device);
71 uint16_t productId = usb_device_get_product_id(device);
72 uint8_t deviceClass = deviceDesc->bDeviceClass;
73 uint8_t deviceSubClass = deviceDesc->bDeviceSubClass;
74 uint8_t protocol = deviceDesc->bDeviceProtocol;
75
76 usb_descriptor_iter_init(device, &iter);
77
78 while ((desc = usb_descriptor_iter_next(&iter)) != NULL) {
79 if (desc->bDescriptorType == USB_DT_INTERFACE) {
80 struct usb_interface_descriptor *interface = (struct usb_interface_descriptor *)desc;
81
82 // push class, subclass, protocol and number of endpoints into interfaceValues vector
83 interfaceValues.add(interface->bInterfaceNumber);
84 interfaceValues.add(interface->bInterfaceClass);
85 interfaceValues.add(interface->bInterfaceSubClass);
86 interfaceValues.add(interface->bInterfaceProtocol);
87 interfaceValues.add(interface->bNumEndpoints);
88 } else if (desc->bDescriptorType == USB_DT_ENDPOINT) {
89 struct usb_endpoint_descriptor *endpoint = (struct usb_endpoint_descriptor *)desc;
90
91 // push address, attributes, max packet size and interval into endpointValues vector
92 endpointValues.add(endpoint->bEndpointAddress);
93 endpointValues.add(endpoint->bmAttributes);
94 endpointValues.add(__le16_to_cpu(endpoint->wMaxPacketSize));
95 endpointValues.add(endpoint->bInterval);
96 }
97 }
98
99 usb_device_close(device);
100
101 // handle generic device notification
102 int length = interfaceValues.size();
103 jintArray interfaceArray = env->NewIntArray(length);
104 env->SetIntArrayRegion(interfaceArray, 0, length, interfaceValues.array());
105
106 length = endpointValues.size();
107 jintArray endpointArray = env->NewIntArray(length);
108 env->SetIntArrayRegion(endpointArray, 0, length, endpointValues.array());
109
110 jstring deviceName = env->NewStringUTF(devname);
111 env->CallVoidMethod(thiz, method_usbDeviceAdded,
112 deviceName, vendorId, productId, deviceClass,
113 deviceSubClass, protocol, interfaceArray, endpointArray);
114
115 env->DeleteLocalRef(interfaceArray);
116 env->DeleteLocalRef(endpointArray);
117 env->DeleteLocalRef(deviceName);
118 checkAndClearExceptionFromCallback(env, __FUNCTION__);
119
120 return 0;
121 }
122
usb_device_removed(const char * devname,void * client_data)123 static int usb_device_removed(const char *devname, void* client_data) {
124 JNIEnv* env = AndroidRuntime::getJNIEnv();
125 jobject thiz = (jobject)client_data;
126
127 jstring deviceName = env->NewStringUTF(devname);
128 env->CallVoidMethod(thiz, method_usbDeviceRemoved, deviceName);
129 env->DeleteLocalRef(deviceName);
130 checkAndClearExceptionFromCallback(env, __FUNCTION__);
131 return 0;
132 }
133
android_server_UsbHostManager_monitorUsbHostBus(JNIEnv * env,jobject thiz)134 static void android_server_UsbHostManager_monitorUsbHostBus(JNIEnv *env, jobject thiz)
135 {
136 struct usb_host_context* context = usb_host_init();
137 if (!context) {
138 ALOGE("usb_host_init failed");
139 return;
140 }
141 // this will never return so it is safe to pass thiz directly
142 usb_host_run(context, usb_device_added, usb_device_removed, NULL, (void *)thiz);
143 }
144
android_server_UsbHostManager_openDevice(JNIEnv * env,jobject thiz,jstring deviceName)145 static jobject android_server_UsbHostManager_openDevice(JNIEnv *env, jobject thiz, jstring deviceName)
146 {
147 const char *deviceNameStr = env->GetStringUTFChars(deviceName, NULL);
148 struct usb_device* device = usb_device_open(deviceNameStr);
149 env->ReleaseStringUTFChars(deviceName, deviceNameStr);
150
151 if (!device)
152 return NULL;
153
154 int fd = usb_device_get_fd(device);
155 if (fd < 0)
156 return NULL;
157 int newFD = dup(fd);
158 usb_device_close(device);
159
160 jobject fileDescriptor = jniCreateFileDescriptor(env, newFD);
161 if (fileDescriptor == NULL) {
162 return NULL;
163 }
164 return env->NewObject(gParcelFileDescriptorOffsets.mClass,
165 gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
166 }
167
168 static JNINativeMethod method_table[] = {
169 { "monitorUsbHostBus", "()V", (void*)android_server_UsbHostManager_monitorUsbHostBus },
170 { "nativeOpenDevice", "(Ljava/lang/String;)Landroid/os/ParcelFileDescriptor;",
171 (void*)android_server_UsbHostManager_openDevice },
172 };
173
register_android_server_UsbHostManager(JNIEnv * env)174 int register_android_server_UsbHostManager(JNIEnv *env)
175 {
176 jclass clazz = env->FindClass("com/android/server/usb/UsbHostManager");
177 if (clazz == NULL) {
178 ALOGE("Can't find com/android/server/usb/UsbHostManager");
179 return -1;
180 }
181 method_usbDeviceAdded = env->GetMethodID(clazz, "usbDeviceAdded", "(Ljava/lang/String;IIIII[I[I)V");
182 if (method_usbDeviceAdded == NULL) {
183 ALOGE("Can't find usbDeviceAdded");
184 return -1;
185 }
186 method_usbDeviceRemoved = env->GetMethodID(clazz, "usbDeviceRemoved", "(Ljava/lang/String;)V");
187 if (method_usbDeviceRemoved == NULL) {
188 ALOGE("Can't find usbDeviceRemoved");
189 return -1;
190 }
191
192 clazz = env->FindClass("android/os/ParcelFileDescriptor");
193 LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
194 gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
195 gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>", "(Ljava/io/FileDescriptor;)V");
196 LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
197 "Unable to find constructor for android.os.ParcelFileDescriptor");
198
199 return jniRegisterNativeMethods(env, "com/android/server/usb/UsbHostManager",
200 method_table, NELEM(method_table));
201 }
202
203 };
204