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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     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 
    134 fail:
    135     usb_device_close(device);
    136     checkAndClearExceptionFromCallback(env, __FUNCTION__);
    137 
    138     return 0;
    139 }
    140 
    141 static 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 
    152 static 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 
    163 static 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 
    189 static 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 
    195 int 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