extensions/browser/api/hid/hid_device_manager.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "extensions/browser/api/hid/hid_device_manager.h"
   6
   7 #include <limits>
   8 #include <vector>
   9
  10 #include "base/lazy_instance.h"
  11 #include "device/hid/hid_service.h"
  12
  13 using device::HidService;
  14 using device::HidUsageAndPage;
  15
  16 namespace extensions {
  17
  18 HidDeviceManager::HidDeviceManager(content::BrowserContext* context)
  19   : next_resource_id_(0) {}
  20
  21 HidDeviceManager::~HidDeviceManager() {}
  22
  23 // static
  24 BrowserContextKeyedAPIFactory<HidDeviceManager>*
  25 HidDeviceManager::GetFactoryInstance() {
  26   static base::LazyInstance<BrowserContextKeyedAPIFactory<HidDeviceManager> >
  27       factory = LAZY_INSTANCE_INITIALIZER;
  28   return &factory.Get();
  29 }
  30
  31 scoped_ptr<base::ListValue> HidDeviceManager::GetApiDevices(
  32     uint16_t vendor_id,
  33     uint16_t product_id) {
  34   UpdateDevices();
  35
  36   HidService* hid_service = HidService::GetInstance();
  37   DCHECK(hid_service);
  38   base::ListValue* api_devices = new base::ListValue();
  39   for (ResourceIdToDeviceIdMap::const_iterator device_iter =
  40            device_ids_.begin();
  41        device_iter != device_ids_.end();
  42        ++device_iter) {
  43     int resource_id = device_iter->first;
  44     device::HidDeviceId device_id = device_iter->second;
  45     device::HidDeviceInfo device_info;
  46
  47     if (hid_service->GetDeviceInfo(device_id, &device_info)) {
  48       if (device_info.vendor_id == vendor_id &&
  49           device_info.product_id == product_id) {
  50         core_api::hid::HidDeviceInfo api_device_info;
  51         api_device_info.device_id = resource_id;
  52         api_device_info.vendor_id = device_info.vendor_id;
  53         api_device_info.product_id = device_info.product_id;
  54         api_device_info.max_input_report_size =
  55             device_info.max_input_report_size;
  56         api_device_info.max_output_report_size =
  57             device_info.max_output_report_size;
  58         api_device_info.max_feature_report_size =
  59             device_info.max_feature_report_size;
  60
  61         for (std::vector<device::HidCollectionInfo>::const_iterator
  62                  collections_iter = device_info.collections.begin();
  63              collections_iter != device_info.collections.end();
  64              ++collections_iter) {
  65           device::HidCollectionInfo collection = *collections_iter;
  66
  67           // Don't expose sensitive data.
  68           if (collection.usage.IsProtected()) {
  69             continue;
  70           }
  71
  72           core_api::hid::HidCollectionInfo* api_collection =
  73               new core_api::hid::HidCollectionInfo();
  74           api_collection->usage_page = collection.usage.usage_page;
  75           api_collection->usage = collection.usage.usage;
  76
  77           api_collection->report_ids.resize(collection.report_ids.size());
  78           std::copy(collection.report_ids.begin(),
  79                     collection.report_ids.end(),
  80                     api_collection->report_ids.begin());
  81
  82           api_device_info.collections.push_back(
  83               make_linked_ptr(api_collection));
  84         }
  85
  86         // Expose devices with which user can communicate.
  87         if (api_device_info.collections.size() > 0)
  88           api_devices->Append(api_device_info.ToValue().release());
  89       }
  90     }
  91   }
  92
  93   return scoped_ptr<base::ListValue>(api_devices);
  94 }
  95
  96 bool HidDeviceManager::GetDeviceInfo(int resource_id,
  97                                      device::HidDeviceInfo* device_info) {
  98   UpdateDevices();
  99   HidService* hid_service = HidService::GetInstance();
 100   DCHECK(hid_service);
 101
 102   ResourceIdToDeviceIdMap::const_iterator device_iter =
 103       device_ids_.find(resource_id);
 104   if (device_iter == device_ids_.end())
 105     return false;
 106
 107   return hid_service->GetDeviceInfo(device_iter->second, device_info);
 108 }
 109
 110 void HidDeviceManager::UpdateDevices() {
 111   thread_checker_.CalledOnValidThread();
 112   HidService* hid_service = HidService::GetInstance();
 113   DCHECK(hid_service);
 114
 115   std::vector<device::HidDeviceInfo> devices;
 116   hid_service->GetDevices(&devices);
 117
 118   // Build an updated bidi mapping between resource ID and underlying device ID.
 119   DeviceIdToResourceIdMap new_resource_ids;
 120   ResourceIdToDeviceIdMap new_device_ids;
 121   for (std::vector<device::HidDeviceInfo>::const_iterator iter =
 122            devices.begin();
 123        iter != devices.end();
 124        ++iter) {
 125     const device::HidDeviceInfo& device_info = *iter;
 126     DeviceIdToResourceIdMap::iterator resource_iter =
 127         resource_ids_.find(device_info.device_id);
 128     int new_id;
 129     if (resource_iter != resource_ids_.end()) {
 130       new_id = resource_iter->second;
 131     } else {
 132       DCHECK_LT(next_resource_id_, std::numeric_limits<int>::max());
 133       new_id = next_resource_id_++;
 134     }
 135     new_resource_ids[device_info.device_id] = new_id;
 136     new_device_ids[new_id] = device_info.device_id;
 137   }
 138   device_ids_.swap(new_device_ids);
 139   resource_ids_.swap(new_resource_ids);
 140 }
 141
 142 }  // namespace extensions