com_android_server_UsbHostManager.cpp revision 9158825f9c41869689d6b1786d7c7aa8bdd524ce 
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 "android_runtime/Log.h"
24#include "utils/Vector.h"
25
26#include <usbhost/usbhost.h>
27
28#include <stdio.h>
29#include <asm/byteorder.h>
30#include <sys/types.h>
31#include <sys/stat.h>
32#include <fcntl.h>
33#include <sys/ioctl.h>
34
35namespace android
36{
37
38static struct parcel_file_descriptor_offsets_t
39{
40    jclass mClass;
41    jmethodID mConstructor;
42} gParcelFileDescriptorOffsets;
43
44static jmethodID method_usbDeviceAdded;
45static jmethodID method_usbDeviceRemoved;
46
47static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
48    if (env->ExceptionCheck()) {
49        ALOGE("An exception was thrown by callback '%s'.", methodName);
50        LOGE_EX(env);
51        env->ExceptionClear();
52    }
53}
54
55static int usb_device_added(const char *devname, void* client_data) {
56    struct usb_descriptor_header* desc;
57    struct usb_descriptor_iter iter;
58
59    struct usb_device *device = usb_device_open(devname);
60    if (!device) {
61        ALOGE("usb_device_open failed\n");
62        return 0;
63    }
64
65    JNIEnv* env = AndroidRuntime::getJNIEnv();
66    jobject thiz = (jobject)client_data;
67    Vector<int> interfaceValues;
68    Vector<int> endpointValues;
69    const usb_device_descriptor* deviceDesc = usb_device_get_device_descriptor(device);
70
71    uint16_t vendorId = usb_device_get_vendor_id(device);
72    uint16_t productId = usb_device_get_product_id(device);
73    uint8_t deviceClass = deviceDesc->bDeviceClass;
74    uint8_t deviceSubClass = deviceDesc->bDeviceSubClass;
75    uint8_t protocol = deviceDesc->bDeviceProtocol;
76
77    usb_descriptor_iter_init(device, &iter);
78
79    while ((desc = usb_descriptor_iter_next(&iter)) != NULL) {
80        if (desc->bDescriptorType == USB_DT_INTERFACE) {
81            struct usb_interface_descriptor *interface = (struct usb_interface_descriptor *)desc;
82
83            // push class, subclass, protocol and number of endpoints into interfaceValues vector
84            interfaceValues.add(interface->bInterfaceNumber);
85            interfaceValues.add(interface->bInterfaceClass);
86            interfaceValues.add(interface->bInterfaceSubClass);
87            interfaceValues.add(interface->bInterfaceProtocol);
88            interfaceValues.add(interface->bNumEndpoints);
89        } else if (desc->bDescriptorType == USB_DT_ENDPOINT) {
90            struct usb_endpoint_descriptor *endpoint = (struct usb_endpoint_descriptor *)desc;
91
92            // push address, attributes, max packet size and interval into endpointValues vector
93            endpointValues.add(endpoint->bEndpointAddress);
94            endpointValues.add(endpoint->bmAttributes);
95            endpointValues.add(__le16_to_cpu(endpoint->wMaxPacketSize));
96            endpointValues.add(endpoint->bInterval);
97        }
98    }
99
100    usb_device_close(device);
101
102    // handle generic device notification
103    int length = interfaceValues.size();
104    jintArray interfaceArray = env->NewIntArray(length);
105    env->SetIntArrayRegion(interfaceArray, 0, length, interfaceValues.array());
106
107    length = endpointValues.size();
108    jintArray endpointArray = env->NewIntArray(length);
109    env->SetIntArrayRegion(endpointArray, 0, length, endpointValues.array());
110
111    jstring deviceName = env->NewStringUTF(devname);
112    env->CallVoidMethod(thiz, method_usbDeviceAdded,
113            deviceName, vendorId, productId, deviceClass,
114            deviceSubClass, protocol, interfaceArray, endpointArray);
115
116    env->DeleteLocalRef(interfaceArray);
117    env->DeleteLocalRef(endpointArray);
118    env->DeleteLocalRef(deviceName);
119    checkAndClearExceptionFromCallback(env, __FUNCTION__);
120
121    return 0;
122}
123
124static int usb_device_removed(const char *devname, void* client_data) {
125    JNIEnv* env = AndroidRuntime::getJNIEnv();
126    jobject thiz = (jobject)client_data;
127
128    jstring deviceName = env->NewStringUTF(devname);
129    env->CallVoidMethod(thiz, method_usbDeviceRemoved, deviceName);
130    env->DeleteLocalRef(deviceName);
131    checkAndClearExceptionFromCallback(env, __FUNCTION__);
132    return 0;
133}
134
135static void android_server_UsbHostManager_monitorUsbHostBus(JNIEnv *env, jobject thiz)
136{
137    struct usb_host_context* context = usb_host_init();
138    if (!context) {
139        ALOGE("usb_host_init failed");
140        return;
141    }
142    // this will never return so it is safe to pass thiz directly
143    usb_host_run(context, usb_device_added, usb_device_removed, NULL, (void *)thiz);
144}
145
146static jobject android_server_UsbHostManager_openDevice(JNIEnv *env, jobject thiz, jstring deviceName)
147{
148    const char *deviceNameStr = env->GetStringUTFChars(deviceName, NULL);
149    struct usb_device* device = usb_device_open(deviceNameStr);
150    env->ReleaseStringUTFChars(deviceName, deviceNameStr);
151
152    if (!device)
153        return NULL;
154
155    int fd = usb_device_get_fd(device);
156    if (fd < 0)
157        return NULL;
158    int newFD = dup(fd);
159    usb_device_close(device);
160
161    jobject fileDescriptor = jniCreateFileDescriptor(env, newFD);
162    if (fileDescriptor == NULL) {
163        return NULL;
164    }
165    return env->NewObject(gParcelFileDescriptorOffsets.mClass,
166        gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
167}
168
169static JNINativeMethod method_table[] = {
170    { "monitorUsbHostBus", "()V", (void*)android_server_UsbHostManager_monitorUsbHostBus },
171    { "nativeOpenDevice",  "(Ljava/lang/String;)Landroid/os/ParcelFileDescriptor;",
172                                  (void*)android_server_UsbHostManager_openDevice },
173};
174
175int register_android_server_UsbHostManager(JNIEnv *env)
176{
177    jclass clazz = env->FindClass("com/android/server/usb/UsbHostManager");
178    if (clazz == NULL) {
179        ALOGE("Can't find com/android/server/usb/UsbHostManager");
180        return -1;
181    }
182    method_usbDeviceAdded = env->GetMethodID(clazz, "usbDeviceAdded", "(Ljava/lang/String;IIIII[I[I)V");
183    if (method_usbDeviceAdded == NULL) {
184        ALOGE("Can't find usbDeviceAdded");
185        return -1;
186    }
187    method_usbDeviceRemoved = env->GetMethodID(clazz, "usbDeviceRemoved", "(Ljava/lang/String;)V");
188    if (method_usbDeviceRemoved == NULL) {
189        ALOGE("Can't find usbDeviceRemoved");
190        return -1;
191    }
192
193    clazz = env->FindClass("android/os/ParcelFileDescriptor");
194    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
195    gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
196    gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>", "(Ljava/io/FileDescriptor;)V");
197    LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
198                 "Unable to find constructor for android.os.ParcelFileDescriptor");
199
200    return jniRegisterNativeMethods(env, "com/android/server/usb/UsbHostManager",
201            method_table, NELEM(method_table));
202}
203
204};
205