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// Copyright 2014 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/hid/hid_device_manager.h"
#include <limits>
#include <vector>
#include "base/lazy_instance.h"
#include "device/hid/hid_service.h"
using device::HidService;
using device::HidUsageAndPage;
namespace extensions {
HidDeviceManager::HidDeviceManager(content::BrowserContext* context)
: next_resource_id_(0) {}
HidDeviceManager::~HidDeviceManager() {}
// static
BrowserContextKeyedAPIFactory<HidDeviceManager>*
HidDeviceManager::GetFactoryInstance() {
static base::LazyInstance<BrowserContextKeyedAPIFactory<HidDeviceManager> >
factory = LAZY_INSTANCE_INITIALIZER;
return &factory.Get();
}
scoped_ptr<base::ListValue> HidDeviceManager::GetApiDevices(
uint16_t vendor_id,
uint16_t product_id) {
UpdateDevices();
HidService* hid_service = HidService::GetInstance();
DCHECK(hid_service);
base::ListValue* api_devices = new base::ListValue();
for (ResourceIdToDeviceIdMap::const_iterator device_iter =
device_ids_.begin();
device_iter != device_ids_.end();
++device_iter) {
int resource_id = device_iter->first;
device::HidDeviceId device_id = device_iter->second;
device::HidDeviceInfo device_info;
if (hid_service->GetDeviceInfo(device_id, &device_info)) {
if (device_info.vendor_id == vendor_id &&
device_info.product_id == product_id) {
api::hid::HidDeviceInfo api_device_info;
api_device_info.device_id = resource_id;
api_device_info.vendor_id = device_info.vendor_id;
api_device_info.product_id = device_info.product_id;
api_device_info.max_input_report_size =
device_info.max_input_report_size;
api_device_info.max_output_report_size =
device_info.max_output_report_size;
api_device_info.max_feature_report_size =
device_info.max_feature_report_size;
for (std::vector<device::HidCollectionInfo>::const_iterator
collections_iter = device_info.collections.begin();
collections_iter != device_info.collections.end();
++collections_iter) {
device::HidCollectionInfo collection = *collections_iter;
// Don't expose sensitive data.
if (collection.usage.IsProtected()) {
continue;
}
api::hid::HidCollectionInfo* api_collection =
new api::hid::HidCollectionInfo();
api_collection->usage_page = collection.usage.usage_page;
api_collection->usage = collection.usage.usage;
api_collection->report_ids.resize(collection.report_ids.size());
std::copy(collection.report_ids.begin(),
collection.report_ids.end(),
api_collection->report_ids.begin());
api_device_info.collections.push_back(
make_linked_ptr(api_collection));
}
// Expose devices with which user can communicate.
if (api_device_info.collections.size() > 0)
api_devices->Append(api_device_info.ToValue().release());
}
}
}
return scoped_ptr<base::ListValue>(api_devices);
}
bool HidDeviceManager::GetDeviceInfo(int resource_id,
device::HidDeviceInfo* device_info) {
UpdateDevices();
HidService* hid_service = HidService::GetInstance();
DCHECK(hid_service);
ResourceIdToDeviceIdMap::const_iterator device_iter =
device_ids_.find(resource_id);
if (device_iter == device_ids_.end())
return false;
return hid_service->GetDeviceInfo(device_iter->second, device_info);
}
void HidDeviceManager::UpdateDevices() {
thread_checker_.CalledOnValidThread();
HidService* hid_service = HidService::GetInstance();
DCHECK(hid_service);
std::vector<device::HidDeviceInfo> devices;
hid_service->GetDevices(&devices);
// Build an updated bidi mapping between resource ID and underlying device ID.
DeviceIdToResourceIdMap new_resource_ids;
ResourceIdToDeviceIdMap new_device_ids;
for (std::vector<device::HidDeviceInfo>::const_iterator iter =
devices.begin();
iter != devices.end();
++iter) {
const device::HidDeviceInfo& device_info = *iter;
DeviceIdToResourceIdMap::iterator resource_iter =
resource_ids_.find(device_info.device_id);
int new_id;
if (resource_iter != resource_ids_.end()) {
new_id = resource_iter->second;
} else {
DCHECK_LT(next_resource_id_, std::numeric_limits<int>::max());
new_id = next_resource_id_++;
}
new_resource_ids[device_info.device_id] = new_id;
new_device_ids[new_id] = device_info.device_id;
}
device_ids_.swap(new_device_ids);
resource_ids_.swap(new_resource_ids);
}
} // namespace extensions
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