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      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 
     46 static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
     47     if (env->ExceptionCheck()) {
     48         LOGE("An exception was thrown by callback '%s'.", methodName);
     49         LOGE_EX(env);
     50         env->ExceptionClear();
     51     }
     52 }
     53 
     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         LOGE("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 
    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 
    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         LOGE("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 
    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 
    174 int register_android_server_UsbHostManager(JNIEnv *env)
    175 {
    176     jclass clazz = env->FindClass("com/android/server/usb/UsbHostManager");
    177     if (clazz == NULL) {
    178         LOGE("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         LOGE("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         LOGE("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