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    int version = usb_device_get_version(device);
75    char *serial = usb_device_get_serial(device);
76
77    jstring deviceName = env->NewStringUTF(devname);
78    jstring manufacturerName = AndroidRuntime::NewStringLatin1(env, manufacturer);
79    jstring productName = AndroidRuntime::NewStringLatin1(env, product);
80    jstring serialNumber = AndroidRuntime::NewStringLatin1(env, serial);
81
82    jboolean result = env->CallBooleanMethod(thiz, method_beginUsbDeviceAdded,
83            deviceName, usb_device_get_vendor_id(device), usb_device_get_product_id(device),
84            deviceDesc->bDeviceClass, deviceDesc->bDeviceSubClass, deviceDesc->bDeviceProtocol,
85            manufacturerName, productName, version, serialNumber);
86
87    env->DeleteLocalRef(serialNumber);
88    env->DeleteLocalRef(productName);
89    env->DeleteLocalRef(manufacturerName);
90    env->DeleteLocalRef(deviceName);
91    free(manufacturer);
92    free(product);
93    free(serial);
94
95    if (!result) goto fail;
96
97    usb_descriptor_iter_init(device, &iter);
98
99    while ((desc = usb_descriptor_iter_next(&iter)) != NULL) {
100        if (desc->bDescriptorType == USB_DT_CONFIG) {
101            struct usb_config_descriptor *config = (struct usb_config_descriptor *)desc;
102            char *name = usb_device_get_string(device, config->iConfiguration);
103            jstring configName = AndroidRuntime::NewStringLatin1(env, name);
104
105            env->CallVoidMethod(thiz, method_addUsbConfiguration,
106                    config->bConfigurationValue, configName, config->bmAttributes,
107                    config->bMaxPower);
108
109            env->DeleteLocalRef(configName);
110            free(name);
111        } else if (desc->bDescriptorType == USB_DT_INTERFACE) {
112            struct usb_interface_descriptor *interface = (struct usb_interface_descriptor *)desc;
113            char *name = usb_device_get_string(device, interface->iInterface);
114            jstring interfaceName = AndroidRuntime::NewStringLatin1(env, name);
115
116            env->CallVoidMethod(thiz, method_addUsbInterface,
117                    interface->bInterfaceNumber, interfaceName, interface->bAlternateSetting,
118                    interface->bInterfaceClass, interface->bInterfaceSubClass,
119                    interface->bInterfaceProtocol);
120
121            env->DeleteLocalRef(interfaceName);
122            free(name);
123        } else if (desc->bDescriptorType == USB_DT_ENDPOINT) {
124            struct usb_endpoint_descriptor *endpoint = (struct usb_endpoint_descriptor *)desc;
125
126            env->CallVoidMethod(thiz, method_addUsbEndpoint,
127                    endpoint->bEndpointAddress, endpoint->bmAttributes,
128                    __le16_to_cpu(endpoint->wMaxPacketSize), endpoint->bInterval);
129        }
130    }
131
132    env->CallVoidMethod(thiz, method_endUsbDeviceAdded);
133
134fail:
135    usb_device_close(device);
136    checkAndClearExceptionFromCallback(env, __FUNCTION__);
137
138    return 0;
139}
140
141static int usb_device_removed(const char *devname, void* client_data) {
142    JNIEnv* env = AndroidRuntime::getJNIEnv();
143    jobject thiz = (jobject)client_data;
144
145    jstring deviceName = env->NewStringUTF(devname);
146    env->CallVoidMethod(thiz, method_usbDeviceRemoved, deviceName);
147    env->DeleteLocalRef(deviceName);
148    checkAndClearExceptionFromCallback(env, __FUNCTION__);
149    return 0;
150}
151
152static void android_server_UsbHostManager_monitorUsbHostBus(JNIEnv* /* env */, jobject thiz)
153{
154    struct usb_host_context* context = usb_host_init();
155    if (!context) {
156        ALOGE("usb_host_init failed");
157        return;
158    }
159    // this will never return so it is safe to pass thiz directly
160    usb_host_run(context, usb_device_added, usb_device_removed, NULL, (void *)thiz);
161}
162
163static jobject android_server_UsbHostManager_openDevice(JNIEnv *env, jobject /* thiz */,
164                                                        jstring deviceName)
165{
166    const char *deviceNameStr = env->GetStringUTFChars(deviceName, NULL);
167    struct usb_device* device = usb_device_open(deviceNameStr);
168    env->ReleaseStringUTFChars(deviceName, deviceNameStr);
169
170    if (!device)
171        return NULL;
172
173    int fd = usb_device_get_fd(device);
174    if (fd < 0) {
175        usb_device_close(device);
176        return NULL;
177    }
178    int newFD = dup(fd);
179    usb_device_close(device);
180
181    jobject fileDescriptor = jniCreateFileDescriptor(env, newFD);
182    if (fileDescriptor == NULL) {
183        return NULL;
184    }
185    return env->NewObject(gParcelFileDescriptorOffsets.mClass,
186        gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
187}
188
189static const JNINativeMethod method_table[] = {
190    { "monitorUsbHostBus", "()V", (void*)android_server_UsbHostManager_monitorUsbHostBus },
191    { "nativeOpenDevice",  "(Ljava/lang/String;)Landroid/os/ParcelFileDescriptor;",
192                                  (void*)android_server_UsbHostManager_openDevice },
193};
194
195int register_android_server_UsbHostManager(JNIEnv *env)
196{
197    jclass clazz = env->FindClass("com/android/server/usb/UsbHostManager");
198    if (clazz == NULL) {
199        ALOGE("Can't find com/android/server/usb/UsbHostManager");
200        return -1;
201    }
202    method_beginUsbDeviceAdded = env->GetMethodID(clazz, "beginUsbDeviceAdded",
203            "(Ljava/lang/String;IIIIILjava/lang/String;Ljava/lang/String;ILjava/lang/String;)Z");
204    if (method_beginUsbDeviceAdded == NULL) {
205        ALOGE("Can't find beginUsbDeviceAdded");
206        return -1;
207    }
208    method_addUsbConfiguration = env->GetMethodID(clazz, "addUsbConfiguration",
209            "(ILjava/lang/String;II)V");
210    if (method_addUsbConfiguration == NULL) {
211        ALOGE("Can't find addUsbConfiguration");
212        return -1;
213    }
214    method_addUsbInterface = env->GetMethodID(clazz, "addUsbInterface",
215            "(ILjava/lang/String;IIII)V");
216    if (method_addUsbInterface == NULL) {
217        ALOGE("Can't find addUsbInterface");
218        return -1;
219    }
220    method_addUsbEndpoint = env->GetMethodID(clazz, "addUsbEndpoint", "(IIII)V");
221    if (method_addUsbEndpoint == NULL) {
222        ALOGE("Can't find addUsbEndpoint");
223        return -1;
224    }
225    method_endUsbDeviceAdded = env->GetMethodID(clazz, "endUsbDeviceAdded", "()V");
226    if (method_endUsbDeviceAdded == NULL) {
227        ALOGE("Can't find endUsbDeviceAdded");
228        return -1;
229    }
230    method_usbDeviceRemoved = env->GetMethodID(clazz, "usbDeviceRemoved",
231            "(Ljava/lang/String;)V");
232    if (method_usbDeviceRemoved == NULL) {
233        ALOGE("Can't find usbDeviceRemoved");
234        return -1;
235    }
236
237    clazz = env->FindClass("android/os/ParcelFileDescriptor");
238    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
239    gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
240    gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>",
241            "(Ljava/io/FileDescriptor;)V");
242    LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
243                 "Unable to find constructor for android.os.ParcelFileDescriptor");
244
245    return jniRegisterNativeMethods(env, "com/android/server/usb/UsbHostManager",
246            method_table, NELEM(method_table));
247}
248
249};
250