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/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "UsbObserver"
#include "utils/Log.h"
#include "jni.h"
#include "JNIHelp.h"
#include "android_runtime/AndroidRuntime.h"
#include "utils/Vector.h"
#include <usbhost/usbhost.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
#include <linux/usb/ch9.h>
#else
#include <linux/usb_ch9.h>
#endif
#include <stdio.h>
namespace android
{
static jmethodID method_usbCameraAdded;
static jmethodID method_usbCameraRemoved;
Vector<int> mDeviceList;
static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
if (env->ExceptionCheck()) {
LOGE("An exception was thrown by callback '%s'.", methodName);
LOGE_EX(env);
env->ExceptionClear();
}
}
static int usb_device_added(const char *devname, void* client_data) {
// check to see if it is a camera
struct usb_descriptor_header* desc;
struct usb_descriptor_iter iter;
struct usb_device *device = usb_device_open(devname);
if (!device) {
LOGE("usb_device_open failed\n");
return 0;
}
usb_descriptor_iter_init(device, &iter);
while ((desc = usb_descriptor_iter_next(&iter)) != NULL) {
if (desc->bDescriptorType == USB_DT_INTERFACE) {
struct usb_interface_descriptor *interface = (struct usb_interface_descriptor *)desc;
if (interface->bInterfaceClass == USB_CLASS_STILL_IMAGE &&
interface->bInterfaceSubClass == 1 && // Still Image Capture
interface->bInterfaceProtocol == 1) // Picture Transfer Protocol (PIMA 15470)
{
LOGD("Found camera: \"%s\" \"%s\"\n", usb_device_get_manufacturer_name(device),
usb_device_get_product_name(device));
// interface should be followed by three endpoints
struct usb_endpoint_descriptor *ep;
struct usb_endpoint_descriptor *ep_in_desc = NULL;
struct usb_endpoint_descriptor *ep_out_desc = NULL;
struct usb_endpoint_descriptor *ep_intr_desc = NULL;
for (int i = 0; i < 3; i++) {
ep = (struct usb_endpoint_descriptor *)usb_descriptor_iter_next(&iter);
if (!ep || ep->bDescriptorType != USB_DT_ENDPOINT) {
LOGE("endpoints not found\n");
goto done;
}
if (ep->bmAttributes == USB_ENDPOINT_XFER_BULK) {
if (ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
ep_in_desc = ep;
else
ep_out_desc = ep;
} else if (ep->bmAttributes == USB_ENDPOINT_XFER_INT &&
ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK) {
ep_intr_desc = ep;
}
}
if (!ep_in_desc || !ep_out_desc || !ep_intr_desc) {
LOGE("endpoints not found\n");
goto done;
}
// if we got here, we found a camera
JNIEnv* env = AndroidRuntime::getJNIEnv();
jobject thiz = (jobject)client_data;
int id = usb_device_get_unique_id_from_name(devname);
mDeviceList.add(id);
env->CallVoidMethod(thiz, method_usbCameraAdded, id);
checkAndClearExceptionFromCallback(env, __FUNCTION__);
}
}
}
done:
usb_device_close(device);
return 0;
}
static int usb_device_removed(const char *devname, void* client_data) {
int id = usb_device_get_unique_id_from_name(devname);
// see if it is a device we know about
for (int i = 0; i < mDeviceList.size(); i++) {
if (id == mDeviceList[i]) {
mDeviceList.removeAt(i);
JNIEnv* env = AndroidRuntime::getJNIEnv();
jobject thiz = (jobject)client_data;
env->CallVoidMethod(thiz, method_usbCameraRemoved, id);
checkAndClearExceptionFromCallback(env, __FUNCTION__);
break;
}
}
return 0;
}
static void android_server_UsbObserver_monitorUsbHostBus(JNIEnv *env, jobject thiz)
{
struct usb_host_context* context = usb_host_init();
if (!context) {
LOGE("usb_host_init failed");
return;
}
// this will never return so it is safe to pass thiz directly
usb_host_run(context, usb_device_added, usb_device_removed, NULL, (void *)thiz);
}
static JNINativeMethod method_table[] = {
{ "monitorUsbHostBus", "()V", (void*)android_server_UsbObserver_monitorUsbHostBus }
};
int register_android_server_UsbObserver(JNIEnv *env)
{
jclass clazz = env->FindClass("com/android/server/UsbObserver");
if (clazz == NULL) {
LOGE("Can't find com/android/server/UsbObserver");
return -1;
}
method_usbCameraAdded = env->GetMethodID(clazz, "usbCameraAdded", "(I)V");
if (method_usbCameraAdded == NULL) {
LOGE("Can't find usbCameraAdded");
return -1;
}
method_usbCameraRemoved = env->GetMethodID(clazz, "usbCameraRemoved", "(I)V");
if (method_usbCameraRemoved == NULL) {
LOGE("Can't find usbCameraRemoved");
return -1;
}
return jniRegisterNativeMethods(env, "com/android/server/UsbObserver",
method_table, NELEM(method_table));
}
};
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