Experimental USB API

chrome/browser/extensions/api/usb/usb_api.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/extensions/api/usb/usb_api.h"
+
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/extensions/api/api_resource_controller.h"
+#include "chrome/browser/extensions/api/usb/usb_device_resource.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/usb/usb_service.h"
+#include "chrome/common/extensions/api/experimental.usb.h"
+
+namespace BulkTransfer = extensions::api::experimental_usb::BulkTransfer;
+namespace CloseDevice = extensions::api::experimental_usb::CloseDevice;
+namespace ControlTransfer = extensions::api::experimental_usb::ControlTransfer;
+namespace FindDevice = extensions::api::experimental_usb::FindDevice;
+namespace InterruptTransfer =
+    extensions::api::experimental_usb::InterruptTransfer;
+using extensions::api::experimental_usb::Device;
+using std::vector;
+
+namespace extensions {
+
+bool UsbFindDeviceFunction::Prepare() {
+  parameters_ = FindDevice::Params::Create(*args_);
+  EXTENSION_FUNCTION_VALIDATE(parameters_.get());
+
+  const int source_id = ExtractSrcId(2);

[miket_OOO, 2012/04/25 23:10:37]

This temporary variable is a little confusing because of the const. Can we kill
two birds with one stone and just get rid of the variable?

[Garret Kelly, 2012/04/26 20:13:44]

Done.

+  event_notifier_ = CreateEventNotifier(source_id);
+
+  return true;
+}
+
+void UsbFindDeviceFunction::Work() {
+  UsbService *const service = profile()->GetUsbService();
+  DCHECK(service) << "No UsbService associated with profile.";
+
+  UsbDevice *const device = service->FindDevice(parameters_->vendor_id,

[miket_OOO, 2012/04/25 23:10:37]

Reminder on */& whitespace.

[Garret Kelly, 2012/04/26 20:13:44]

Done.

+                                                parameters_->product_id);
+  if (!device) {
+    result_.reset(base::Value::CreateNullValue());
+    return;
+  }
+
+  UsbDeviceResource *const resource = new UsbDeviceResource(event_notifier_,
+                                                            device);
+
+  Device result;
+  result.handle = controller()->AddAPIResource(resource);
+  result.vendor_id = parameters_->vendor_id;
+  result.product_id = parameters_->product_id;
+  result_ = result.ToValue();
+}
+
+bool UsbFindDeviceFunction::Respond() {
+  return true;
+}
+
+bool UsbCloseDeviceFunction::Prepare() {
+  parameters_ = CloseDevice::Params::Create(*args_);
+  EXTENSION_FUNCTION_VALIDATE(parameters_.get());
+  return true;
+}
+
+void UsbCloseDeviceFunction::Work() {
+  controller()->RemoveAPIResource(parameters_->device.handle);
+}
+
+bool UsbCloseDeviceFunction::Respond() {
+  return true;
+}
+
+bool UsbControlTransferFunction::Prepare() {
+  parameters_ = ControlTransfer::Params::Create(*args_);
+  EXTENSION_FUNCTION_VALIDATE(parameters_.get());
+  return true;
+}
+
+void UsbControlTransferFunction::Work() {
+  UsbDeviceResource *const device = controller()->GetUsbDeviceResource(
+      parameters_->device.handle);
+  if (device) {
+    device->ControlTransfer(parameters_->transfer_info);
+  }
+}
+
+bool UsbControlTransferFunction::Respond() {
+  return true;
+}
+
+bool UsbBulkTransferFunction::Prepare() {
+  parameters_ = BulkTransfer::Params::Create(*args_);
+  EXTENSION_FUNCTION_VALIDATE(parameters_.get());
+  return true;
+}
+
+void UsbBulkTransferFunction::Work() {
+  UsbDeviceResource *const device = controller()->GetUsbDeviceResource(
+      parameters_->device.handle);
+  if (device) {
+    device->BulkTransfer(parameters_->transfer_info);
+  }
+}
+
+bool UsbBulkTransferFunction::Respond() {
+  return true;
+}
+
+bool UsbInterruptTransferFunction::Prepare() {
+  parameters_ = InterruptTransfer::Params::Create(*args_);
+  EXTENSION_FUNCTION_VALIDATE(parameters_.get());
+  return true;
+}
+
+void UsbInterruptTransferFunction::Work() {
+  UsbDeviceResource *const device = controller()->GetUsbDeviceResource(
+      parameters_->device.handle);
+  if (device) {
+    device->InterruptTransfer(parameters_->transfer_info);
+  }
+}
+
+bool UsbInterruptTransferFunction::Respond() {
+  return true;
+}
+
+}  // namespace extensions