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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 "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 
     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_beginUsbDeviceAdded;
     44 static jmethodID method_addUsbConfiguration;
     45 static jmethodID method_addUsbInterface;
     46 static jmethodID method_addUsbEndpoint;
     47 static jmethodID method_endUsbDeviceAdded;
     48 static jmethodID method_usbDeviceRemoved;
     49 
     50 static 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 
     58 static 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 
    133 fail:
    134     usb_device_close(device);
    135     checkAndClearExceptionFromCallback(env, __FUNCTION__);
    136 
    137     return 0;
    138 }
    139 
    140 static 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 
    151 static 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 
    162 static 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 
    187 static 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 
    193 int 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