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
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
34namespace android
35{
36
37static struct parcel_file_descriptor_offsets_t
38{
39    jclass mClass;
40    jmethodID mConstructor;
41} gParcelFileDescriptorOffsets;
42
43static jmethodID method_beginUsbDeviceAdded;
44static jmethodID method_addUsbConfiguration;
45static jmethodID method_addUsbInterface;
46static jmethodID method_addUsbEndpoint;
47static jmethodID method_endUsbDeviceAdded;
48static jmethodID method_usbDeviceRemoved;
49
50static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
51    if (env->ExceptionCheck()) {
52        ALOGE("An exception was thrown by callback '%s'.", methodName);
53        LOGE_EX(env);
54        env->ExceptionClear();
55    }
56}
57
58static int usb_device_added(const char *devname, void* client_data) {
59    struct usb_descriptor_header* desc;
60    struct usb_descriptor_iter iter;
61
62    struct usb_device *device = usb_device_open(devname);
63    if (!device) {
64        ALOGE("usb_device_open failed\n");
65        return 0;
66    }
67
68    JNIEnv* env = AndroidRuntime::getJNIEnv();
69    jobject thiz = (jobject)client_data;
70    const usb_device_descriptor* deviceDesc = usb_device_get_device_descriptor(device);
71
72    char *manufacturer = usb_device_get_manufacturer_name(device);
73    char *product = usb_device_get_product_name(device);
74    char *serial = usb_device_get_serial(device);
75
76    jstring deviceName = env->NewStringUTF(devname);
77    jstring manufacturerName = AndroidRuntime::NewStringLatin1(env, manufacturer);
78    jstring productName = AndroidRuntime::NewStringLatin1(env, product);
79    jstring serialNumber = AndroidRuntime::NewStringLatin1(env, serial);
80
81    jboolean result = env->CallBooleanMethod(thiz, method_beginUsbDeviceAdded,
82            deviceName, usb_device_get_vendor_id(device), usb_device_get_product_id(device),
83            deviceDesc->bDeviceClass, deviceDesc->bDeviceSubClass, deviceDesc->bDeviceProtocol,
84            manufacturerName, productName, serialNumber);
85
86    env->DeleteLocalRef(serialNumber);
87    env->DeleteLocalRef(productName);
88    env->DeleteLocalRef(manufacturerName);
89    env->DeleteLocalRef(deviceName);
90    free(manufacturer);
91    free(product);
92    free(serial);
93
94    if (!result) goto fail;
95
96    usb_descriptor_iter_init(device, &iter);
97
98    while ((desc = usb_descriptor_iter_next(&iter)) != NULL) {
99        if (desc->bDescriptorType == USB_DT_CONFIG) {
100            struct usb_config_descriptor *config = (struct usb_config_descriptor *)desc;
101            char *name = usb_device_get_string(device, config->iConfiguration);
102            jstring configName = AndroidRuntime::NewStringLatin1(env, name);
103
104            env->CallVoidMethod(thiz, method_addUsbConfiguration,
105                    config->bConfigurationValue, configName, config->bmAttributes,
106                    config->bMaxPower);
107
108            env->DeleteLocalRef(configName);
109            free(name);
110        } else if (desc->bDescriptorType == USB_DT_INTERFACE) {
111            struct usb_interface_descriptor *interface = (struct usb_interface_descriptor *)desc;
112            char *name = usb_device_get_string(device, interface->iInterface);
113            jstring interfaceName = AndroidRuntime::NewStringLatin1(env, name);
114
115            env->CallVoidMethod(thiz, method_addUsbInterface,
116                    interface->bInterfaceNumber, interfaceName, interface->bAlternateSetting,
117                    interface->bInterfaceClass, interface->bInterfaceSubClass,
118                    interface->bInterfaceProtocol);
119
120            env->DeleteLocalRef(interfaceName);
121            free(name);
122        } else if (desc->bDescriptorType == USB_DT_ENDPOINT) {
123            struct usb_endpoint_descriptor *endpoint = (struct usb_endpoint_descriptor *)desc;
124
125            env->CallVoidMethod(thiz, method_addUsbEndpoint,
126                    endpoint->bEndpointAddress, endpoint->bmAttributes,
127                    __le16_to_cpu(endpoint->wMaxPacketSize), endpoint->bInterval);
128        }
129    }
130
131    env->CallVoidMethod(thiz, method_endUsbDeviceAdded);
132
133fail:
134    usb_device_close(device);
135    checkAndClearExceptionFromCallback(env, __FUNCTION__);
136
137    return 0;
138}
139
140static int usb_device_removed(const char *devname, void* client_data) {
141    JNIEnv* env = AndroidRuntime::getJNIEnv();
142    jobject thiz = (jobject)client_data;
143
144    jstring deviceName = env->NewStringUTF(devname);
145    env->CallVoidMethod(thiz, method_usbDeviceRemoved, deviceName);
146    env->DeleteLocalRef(deviceName);
147    checkAndClearExceptionFromCallback(env, __FUNCTION__);
148    return 0;
149}
150
151static void android_server_UsbHostManager_monitorUsbHostBus(JNIEnv *env, jobject thiz)
152{
153    struct usb_host_context* context = usb_host_init();
154    if (!context) {
155        ALOGE("usb_host_init failed");
156        return;
157    }
158    // this will never return so it is safe to pass thiz directly
159    usb_host_run(context, usb_device_added, usb_device_removed, NULL, (void *)thiz);
160}
161
162static jobject android_server_UsbHostManager_openDevice(JNIEnv *env, jobject thiz, jstring deviceName)
163{
164    const char *deviceNameStr = env->GetStringUTFChars(deviceName, NULL);
165    struct usb_device* device = usb_device_open(deviceNameStr);
166    env->ReleaseStringUTFChars(deviceName, deviceNameStr);
167
168    if (!device)
169        return NULL;
170
171    int fd = usb_device_get_fd(device);
172    if (fd < 0) {
173        usb_device_close(device);
174        return NULL;
175    }
176    int newFD = dup(fd);
177    usb_device_close(device);
178
179    jobject fileDescriptor = jniCreateFileDescriptor(env, newFD);
180    if (fileDescriptor == NULL) {
181        return NULL;
182    }
183    return env->NewObject(gParcelFileDescriptorOffsets.mClass,
184        gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
185}
186
187static JNINativeMethod method_table[] = {
188    { "monitorUsbHostBus", "()V", (void*)android_server_UsbHostManager_monitorUsbHostBus },
189    { "nativeOpenDevice",  "(Ljava/lang/String;)Landroid/os/ParcelFileDescriptor;",
190                                  (void*)android_server_UsbHostManager_openDevice },
191};
192
193int register_android_server_UsbHostManager(JNIEnv *env)
194{
195    jclass clazz = env->FindClass("com/android/server/usb/UsbHostManager");
196    if (clazz == NULL) {
197        ALOGE("Can't find com/android/server/usb/UsbHostManager");
198        return -1;
199    }
200    method_beginUsbDeviceAdded = env->GetMethodID(clazz, "beginUsbDeviceAdded",
201            "(Ljava/lang/String;IIIIILjava/lang/String;Ljava/lang/String;Ljava/lang/String;)Z");
202    if (method_beginUsbDeviceAdded == NULL) {
203        ALOGE("Can't find beginUsbDeviceAdded");
204        return -1;
205    }
206    method_addUsbConfiguration = env->GetMethodID(clazz, "addUsbConfiguration",
207            "(ILjava/lang/String;II)V");
208    if (method_addUsbConfiguration == NULL) {
209        ALOGE("Can't find addUsbConfiguration");
210        return -1;
211    }
212    method_addUsbInterface = env->GetMethodID(clazz, "addUsbInterface",
213            "(ILjava/lang/String;IIII)V");
214    if (method_addUsbInterface == NULL) {
215        ALOGE("Can't find addUsbInterface");
216        return -1;
217    }
218    method_addUsbEndpoint = env->GetMethodID(clazz, "addUsbEndpoint", "(IIII)V");
219    if (method_addUsbEndpoint == NULL) {
220        ALOGE("Can't find addUsbEndpoint");
221        return -1;
222    }
223    method_endUsbDeviceAdded = env->GetMethodID(clazz, "endUsbDeviceAdded", "()V");
224    if (method_endUsbDeviceAdded == NULL) {
225        ALOGE("Can't find endUsbDeviceAdded");
226        return -1;
227    }
228    method_usbDeviceRemoved = env->GetMethodID(clazz, "usbDeviceRemoved",
229            "(Ljava/lang/String;)V");
230    if (method_usbDeviceRemoved == NULL) {
231        ALOGE("Can't find usbDeviceRemoved");
232        return -1;
233    }
234
235    clazz = env->FindClass("android/os/ParcelFileDescriptor");
236    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
237    gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
238    gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>",
239            "(Ljava/io/FileDescriptor;)V");
240    LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
241                 "Unable to find constructor for android.os.ParcelFileDescriptor");
242
243    return jniRegisterNativeMethods(env, "com/android/server/usb/UsbHostManager",
244            method_table, NELEM(method_table));
245}
246
247};
248