com_android_server_UsbHostManager.cpp revision 7531aa22355cf03f51def61ba67f1636bf85f408 
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_beginUsbDeviceAdded;
45static jmethodID method_addUsbConfiguration;
46static jmethodID method_addUsbInterface;
47static jmethodID method_addUsbEndpoint;
48static jmethodID method_endUsbDeviceAdded;
49static jmethodID method_usbDeviceRemoved;
50
51static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
52    if (env->ExceptionCheck()) {
53        ALOGE("An exception was thrown by callback '%s'.", methodName);
54        LOGE_EX(env);
55        env->ExceptionClear();
56    }
57}
58
59static int usb_device_added(const char *devname, void* client_data) {
60    struct usb_descriptor_header* desc;
61    struct usb_descriptor_iter iter;
62
63    struct usb_device *device = usb_device_open(devname);
64    if (!device) {
65        ALOGE("usb_device_open failed\n");
66        return 0;
67    }
68
69    JNIEnv* env = AndroidRuntime::getJNIEnv();
70    jobject thiz = (jobject)client_data;
71    Vector<int> interfaceValues;
72    Vector<int> endpointValues;
73    const usb_device_descriptor* deviceDesc = usb_device_get_device_descriptor(device);
74
75    char *manufacturer = usb_device_get_manufacturer_name(device);
76    char *product = usb_device_get_product_name(device);
77    char *serial = usb_device_get_serial(device);
78
79    jstring deviceName = env->NewStringUTF(devname);
80    jstring manufacturerName = env->NewStringUTF(manufacturer);
81    jstring productName = env->NewStringUTF(product);
82    jstring serialNumber = env->NewStringUTF(serial);
83
84    jboolean result = env->CallBooleanMethod(thiz, method_beginUsbDeviceAdded,
85            deviceName, usb_device_get_vendor_id(device), usb_device_get_product_id(device),
86            deviceDesc->bDeviceClass, deviceDesc->bDeviceSubClass, deviceDesc->bDeviceProtocol,
87            manufacturerName, productName, serialNumber);
88
89    env->DeleteLocalRef(serialNumber);
90    env->DeleteLocalRef(productName);
91    env->DeleteLocalRef(manufacturerName);
92    env->DeleteLocalRef(deviceName);
93    free(manufacturer);
94    free(product);
95    free(serial);
96
97    if (!result) goto fail;
98
99    usb_descriptor_iter_init(device, &iter);
100
101    while ((desc = usb_descriptor_iter_next(&iter)) != NULL) {
102        if (desc->bDescriptorType == USB_DT_CONFIG) {
103            struct usb_config_descriptor *config = (struct usb_config_descriptor *)desc;
104            char *name = usb_device_get_string(device, config->iConfiguration);
105            jstring configName = env->NewStringUTF(name);
106
107            env->CallVoidMethod(thiz, method_addUsbConfiguration,
108                    config->bConfigurationValue, configName, config->bmAttributes,
109                    config->bMaxPower);
110
111            env->DeleteLocalRef(configName);
112            free(name);
113        } else if (desc->bDescriptorType == USB_DT_INTERFACE) {
114            struct usb_interface_descriptor *interface = (struct usb_interface_descriptor *)desc;
115            char *name = usb_device_get_string(device, interface->iInterface);
116            jstring interfaceName = env->NewStringUTF(name);
117
118            env->CallVoidMethod(thiz, method_addUsbInterface,
119                    interface->bInterfaceNumber, interfaceName, interface->bAlternateSetting,
120                    interface->bInterfaceClass, interface->bInterfaceSubClass,
121                    interface->bInterfaceProtocol);
122
123            env->DeleteLocalRef(interfaceName);
124            free(name);
125        } else if (desc->bDescriptorType == USB_DT_ENDPOINT) {
126            struct usb_endpoint_descriptor *endpoint = (struct usb_endpoint_descriptor *)desc;
127
128            env->CallVoidMethod(thiz, method_addUsbEndpoint,
129                    endpoint->bEndpointAddress, endpoint->bmAttributes,
130                    __le16_to_cpu(endpoint->wMaxPacketSize), endpoint->bInterval);
131        }
132    }
133
134    env->CallVoidMethod(thiz, method_endUsbDeviceAdded);
135
136fail:
137    usb_device_close(device);
138    checkAndClearExceptionFromCallback(env, __FUNCTION__);
139
140    return 0;
141}
142
143static int usb_device_removed(const char *devname, void* client_data) {
144    JNIEnv* env = AndroidRuntime::getJNIEnv();
145    jobject thiz = (jobject)client_data;
146
147    jstring deviceName = env->NewStringUTF(devname);
148    env->CallVoidMethod(thiz, method_usbDeviceRemoved, deviceName);
149    env->DeleteLocalRef(deviceName);
150    checkAndClearExceptionFromCallback(env, __FUNCTION__);
151    return 0;
152}
153
154static void android_server_UsbHostManager_monitorUsbHostBus(JNIEnv *env, jobject thiz)
155{
156    struct usb_host_context* context = usb_host_init();
157    if (!context) {
158        ALOGE("usb_host_init failed");
159        return;
160    }
161    // this will never return so it is safe to pass thiz directly
162    usb_host_run(context, usb_device_added, usb_device_removed, NULL, (void *)thiz);
163}
164
165static jobject android_server_UsbHostManager_openDevice(JNIEnv *env, jobject thiz, jstring deviceName)
166{
167    const char *deviceNameStr = env->GetStringUTFChars(deviceName, NULL);
168    struct usb_device* device = usb_device_open(deviceNameStr);
169    env->ReleaseStringUTFChars(deviceName, deviceNameStr);
170
171    if (!device)
172        return NULL;
173
174    int fd = usb_device_get_fd(device);
175    if (fd < 0) {
176        usb_device_close(device);
177        return NULL;
178    }
179    int newFD = dup(fd);
180    usb_device_close(device);
181
182    jobject fileDescriptor = jniCreateFileDescriptor(env, newFD);
183    if (fileDescriptor == NULL) {
184        return NULL;
185    }
186    return env->NewObject(gParcelFileDescriptorOffsets.mClass,
187        gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
188}
189
190static JNINativeMethod method_table[] = {
191    { "monitorUsbHostBus", "()V", (void*)android_server_UsbHostManager_monitorUsbHostBus },
192    { "nativeOpenDevice",  "(Ljava/lang/String;)Landroid/os/ParcelFileDescriptor;",
193                                  (void*)android_server_UsbHostManager_openDevice },
194};
195
196int register_android_server_UsbHostManager(JNIEnv *env)
197{
198    jclass clazz = env->FindClass("com/android/server/usb/UsbHostManager");
199    if (clazz == NULL) {
200        ALOGE("Can't find com/android/server/usb/UsbHostManager");
201        return -1;
202    }
203    method_beginUsbDeviceAdded = env->GetMethodID(clazz, "beginUsbDeviceAdded",
204            "(Ljava/lang/String;IIIIILjava/lang/String;Ljava/lang/String;Ljava/lang/String;)Z");
205    if (method_beginUsbDeviceAdded == NULL) {
206        ALOGE("Can't find beginUsbDeviceAdded");
207        return -1;
208    }
209    method_addUsbConfiguration = env->GetMethodID(clazz, "addUsbConfiguration",
210            "(ILjava/lang/String;II)V");
211    if (method_addUsbConfiguration == NULL) {
212        ALOGE("Can't find addUsbConfiguration");
213        return -1;
214    }
215    method_addUsbInterface = env->GetMethodID(clazz, "addUsbInterface",
216            "(ILjava/lang/String;IIII)V");
217    if (method_addUsbInterface == NULL) {
218        ALOGE("Can't find addUsbInterface");
219        return -1;
220    }
221    method_addUsbEndpoint = env->GetMethodID(clazz, "addUsbEndpoint", "(IIII)V");
222    if (method_addUsbEndpoint == NULL) {
223        ALOGE("Can't find addUsbEndpoint");
224        return -1;
225    }
226    method_endUsbDeviceAdded = env->GetMethodID(clazz, "endUsbDeviceAdded", "()V");
227    if (method_endUsbDeviceAdded == NULL) {
228        ALOGE("Can't find endUsbDeviceAdded");
229        return -1;
230    }
231    method_usbDeviceRemoved = env->GetMethodID(clazz, "usbDeviceRemoved",
232            "(Ljava/lang/String;)V");
233    if (method_usbDeviceRemoved == NULL) {
234        ALOGE("Can't find usbDeviceRemoved");
235        return -1;
236    }
237
238    clazz = env->FindClass("android/os/ParcelFileDescriptor");
239    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
240    gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
241    gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>",
242            "(Ljava/io/FileDescriptor;)V");
243    LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
244                 "Unable to find constructor for android.os.ParcelFileDescriptor");
245
246    return jniRegisterNativeMethods(env, "com/android/server/usb/UsbHostManager",
247            method_table, NELEM(method_table));
248}
249
250};
251