diff options
Diffstat (limited to 'services/jni/com_android_server_UsbObserver.cpp')
| -rw-r--r-- | services/jni/com_android_server_UsbObserver.cpp | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/services/jni/com_android_server_UsbObserver.cpp b/services/jni/com_android_server_UsbObserver.cpp new file mode 100644 index 0000000..7c478d5 --- /dev/null +++ b/services/jni/com_android_server_UsbObserver.cpp @@ -0,0 +1,174 @@ +/* + * 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)); +} + +}; |