src/device/hid/hid_service_mac.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 "device/hid/hid_service_mac.h"
   6
   7 #include <CoreFoundation/CoreFoundation.h>
   8 #include <IOKit/hid/IOHIDManager.h>
   9
  10 #include <set>
  11 #include <string>
  12 #include <vector>
  13
  14 #include "base/bind.h"
  15 #include "base/logging.h"
  16 #include "base/mac/foundation_util.h"
  17 #include "base/message_loop/message_loop.h"
  18 #include "base/message_loop/message_loop_proxy.h"
  19 #include "base/stl_util.h"
  20 #include "base/strings/string_number_conversions.h"
  21 #include "base/strings/sys_string_conversions.h"
  22 #include "base/threading/thread_restrictions.h"
  23 #include "device/hid/hid_connection_mac.h"
  24
  25 namespace device {
  26
  27 class HidServiceMac;
  28
  29 namespace {
  30
  31 typedef std::vector<IOHIDDeviceRef> HidDeviceList;
  32
  33 HidServiceMac* HidServiceFromContext(void* context) {
  34   return static_cast<HidServiceMac*>(context);
  35 }
  36
  37 // Callback for CFSetApplyFunction as used by EnumerateHidDevices.
  38 void HidEnumerationBackInserter(const void* value, void* context) {
  39   HidDeviceList* devices = static_cast<HidDeviceList*>(context);
  40   const IOHIDDeviceRef device =
  41       static_cast<IOHIDDeviceRef>(const_cast<void*>(value));
  42   devices->push_back(device);
  43 }
  44
  45 void EnumerateHidDevices(IOHIDManagerRef hid_manager,
  46                          HidDeviceList* device_list) {
  47   DCHECK(device_list->size() == 0);
  48   // Note that our ownership of each copied device is implied.
  49   base::ScopedCFTypeRef<CFSetRef> devices(IOHIDManagerCopyDevices(hid_manager));
  50   if (devices)
  51     CFSetApplyFunction(devices, HidEnumerationBackInserter, device_list);
  52 }
  53
  54 bool TryGetHidIntProperty(IOHIDDeviceRef device,
  55                           CFStringRef key,
  56                           int32_t* result) {
  57   CFNumberRef ref =
  58       base::mac::CFCast<CFNumberRef>(IOHIDDeviceGetProperty(device, key));
  59   return ref && CFNumberGetValue(ref, kCFNumberSInt32Type, result);
  60 }
  61
  62 int32_t GetHidIntProperty(IOHIDDeviceRef device, CFStringRef key) {
  63   int32_t value;
  64   if (TryGetHidIntProperty(device, key, &value))
  65     return value;
  66   return 0;
  67 }
  68
  69 bool TryGetHidStringProperty(IOHIDDeviceRef device,
  70                              CFStringRef key,
  71                              std::string* result) {
  72   CFStringRef ref =
  73       base::mac::CFCast<CFStringRef>(IOHIDDeviceGetProperty(device, key));
  74   if (!ref) {
  75     return false;
  76   }
  77   *result = base::SysCFStringRefToUTF8(ref);
  78   return true;
  79 }
  80
  81 std::string GetHidStringProperty(IOHIDDeviceRef device, CFStringRef key) {
  82   std::string value;
  83   TryGetHidStringProperty(device, key, &value);
  84   return value;
  85 }
  86
  87 void GetReportIds(IOHIDElementRef element, std::set<int>* reportIDs) {
  88   uint32_t reportID = IOHIDElementGetReportID(element);
  89   if (reportID) {
  90     reportIDs->insert(reportID);
  91   }
  92
  93   CFArrayRef children = IOHIDElementGetChildren(element);
  94   if (!children) {
  95     return;
  96   }
  97
  98   CFIndex childrenCount = CFArrayGetCount(children);
  99   for (CFIndex j = 0; j < childrenCount; ++j) {
 100     const IOHIDElementRef child = static_cast<IOHIDElementRef>(
 101         const_cast<void*>(CFArrayGetValueAtIndex(children, j)));
 102     GetReportIds(child, reportIDs);
 103   }
 104 }
 105
 106 void GetCollectionInfos(IOHIDDeviceRef device,
 107                         bool* has_report_id,
 108                         std::vector<HidCollectionInfo>* top_level_collections) {
 109   STLClearObject(top_level_collections);
 110   CFMutableDictionaryRef collections_filter =
 111       CFDictionaryCreateMutable(kCFAllocatorDefault,
 112                                 0,
 113                                 &kCFTypeDictionaryKeyCallBacks,
 114                                 &kCFTypeDictionaryValueCallBacks);
 115   const int kCollectionTypeValue = kIOHIDElementTypeCollection;
 116   CFNumberRef collection_type_id = CFNumberCreate(
 117       kCFAllocatorDefault, kCFNumberIntType, &kCollectionTypeValue);
 118   CFDictionarySetValue(
 119       collections_filter, CFSTR(kIOHIDElementTypeKey), collection_type_id);
 120   CFRelease(collection_type_id);
 121   CFArrayRef collections = IOHIDDeviceCopyMatchingElements(
 122       device, collections_filter, kIOHIDOptionsTypeNone);
 123   CFIndex collectionsCount = CFArrayGetCount(collections);
 124   *has_report_id = false;
 125   for (CFIndex i = 0; i < collectionsCount; i++) {
 126     const IOHIDElementRef collection = static_cast<IOHIDElementRef>(
 127         const_cast<void*>(CFArrayGetValueAtIndex(collections, i)));
 128     // Top-Level Collection has no parent
 129     if (IOHIDElementGetParent(collection) == 0) {
 130       HidCollectionInfo collection_info;
 131       HidUsageAndPage::Page page = static_cast<HidUsageAndPage::Page>(
 132           IOHIDElementGetUsagePage(collection));
 133       uint16_t usage = IOHIDElementGetUsage(collection);
 134       collection_info.usage = HidUsageAndPage(usage, page);
 135       // Explore children recursively and retrieve their report IDs
 136       GetReportIds(collection, &collection_info.report_ids);
 137       if (collection_info.report_ids.size() > 0) {
 138         *has_report_id = true;
 139       }
 140       top_level_collections->push_back(collection_info);
 141     }
 142   }
 143 }
 144
 145 }  // namespace
 146
 147 HidServiceMac::HidServiceMac() {
 148   DCHECK(thread_checker_.CalledOnValidThread());
 149   message_loop_ = base::MessageLoopProxy::current();
 150   DCHECK(message_loop_.get());
 151   hid_manager_.reset(IOHIDManagerCreate(NULL, 0));
 152   if (!hid_manager_) {
 153     LOG(ERROR) << "Failed to initialize HidManager";
 154     return;
 155   }
 156   DCHECK(CFGetTypeID(hid_manager_) == IOHIDManagerGetTypeID());
 157   IOHIDManagerOpen(hid_manager_, kIOHIDOptionsTypeNone);
 158   IOHIDManagerSetDeviceMatching(hid_manager_, NULL);
 159
 160   // Enumerate all the currently known devices.
 161   Enumerate();
 162
 163   // Register for plug/unplug notifications.
 164   StartWatchingDevices();
 165 }
 166
 167 HidServiceMac::~HidServiceMac() {
 168   StopWatchingDevices();
 169 }
 170
 171 void HidServiceMac::StartWatchingDevices() {
 172   DCHECK(thread_checker_.CalledOnValidThread());
 173   IOHIDManagerRegisterDeviceMatchingCallback(
 174       hid_manager_, &AddDeviceCallback, this);
 175   IOHIDManagerRegisterDeviceRemovalCallback(
 176       hid_manager_, &RemoveDeviceCallback, this);
 177   IOHIDManagerScheduleWithRunLoop(
 178       hid_manager_, CFRunLoopGetMain(), kCFRunLoopDefaultMode);
 179 }
 180
 181 void HidServiceMac::StopWatchingDevices() {
 182   DCHECK(thread_checker_.CalledOnValidThread());
 183   if (!hid_manager_)
 184     return;
 185   IOHIDManagerUnscheduleFromRunLoop(
 186       hid_manager_, CFRunLoopGetMain(), kCFRunLoopDefaultMode);
 187   IOHIDManagerClose(hid_manager_, kIOHIDOptionsTypeNone);
 188 }
 189
 190 void HidServiceMac::AddDeviceCallback(void* context,
 191                                       IOReturn result,
 192                                       void* sender,
 193                                       IOHIDDeviceRef hid_device) {
 194   DCHECK(CFRunLoopGetMain() == CFRunLoopGetCurrent());
 195   // Claim ownership of the device.
 196   CFRetain(hid_device);
 197   HidServiceMac* service = HidServiceFromContext(context);
 198   service->message_loop_->PostTask(FROM_HERE,
 199                                    base::Bind(&HidServiceMac::PlatformAddDevice,
 200                                               base::Unretained(service),
 201                                               base::Unretained(hid_device)));
 202 }
 203
 204 void HidServiceMac::RemoveDeviceCallback(void* context,
 205                                          IOReturn result,
 206                                          void* sender,
 207                                          IOHIDDeviceRef hid_device) {
 208   DCHECK(CFRunLoopGetMain() == CFRunLoopGetCurrent());
 209   HidServiceMac* service = HidServiceFromContext(context);
 210   service->message_loop_->PostTask(
 211       FROM_HERE,
 212       base::Bind(&HidServiceMac::PlatformRemoveDevice,
 213                  base::Unretained(service),
 214                  base::Unretained(hid_device)));
 215 }
 216
 217 void HidServiceMac::Enumerate() {
 218   DCHECK(thread_checker_.CalledOnValidThread());
 219   HidDeviceList devices;
 220   EnumerateHidDevices(hid_manager_, &devices);
 221   for (HidDeviceList::const_iterator iter = devices.begin();
 222        iter != devices.end();
 223        ++iter) {
 224     IOHIDDeviceRef hid_device = *iter;
 225     PlatformAddDevice(hid_device);
 226   }
 227 }
 228
 229 void HidServiceMac::PlatformAddDevice(IOHIDDeviceRef hid_device) {
 230   // Note that our ownership of hid_device is implied if calling this method.
 231   // It is balanced in PlatformRemoveDevice.
 232   DCHECK(thread_checker_.CalledOnValidThread());
 233   HidDeviceInfo device_info;
 234   device_info.device_id = hid_device;
 235   device_info.vendor_id =
 236       GetHidIntProperty(hid_device, CFSTR(kIOHIDVendorIDKey));
 237   device_info.product_id =
 238       GetHidIntProperty(hid_device, CFSTR(kIOHIDProductIDKey));
 239   device_info.product_name =
 240       GetHidStringProperty(hid_device, CFSTR(kIOHIDProductKey));
 241   device_info.serial_number =
 242       GetHidStringProperty(hid_device, CFSTR(kIOHIDSerialNumberKey));
 243   GetCollectionInfos(hid_device,
 244                      &device_info.has_report_id,
 245                      &device_info.collections);
 246   device_info.max_input_report_size =
 247       GetHidIntProperty(hid_device, CFSTR(kIOHIDMaxInputReportSizeKey));
 248   if (device_info.has_report_id && device_info.max_input_report_size > 0) {
 249     device_info.max_input_report_size--;
 250   }
 251   device_info.max_output_report_size =
 252       GetHidIntProperty(hid_device, CFSTR(kIOHIDMaxOutputReportSizeKey));
 253   if (device_info.has_report_id && device_info.max_output_report_size > 0) {
 254     device_info.max_output_report_size--;
 255   }
 256   device_info.max_feature_report_size =
 257       GetHidIntProperty(hid_device, CFSTR(kIOHIDMaxFeatureReportSizeKey));
 258   if (device_info.has_report_id && device_info.max_feature_report_size > 0) {
 259     device_info.max_feature_report_size--;
 260   }
 261   AddDevice(device_info);
 262 }
 263
 264 void HidServiceMac::PlatformRemoveDevice(IOHIDDeviceRef hid_device) {
 265   DCHECK(thread_checker_.CalledOnValidThread());
 266   RemoveDevice(hid_device);
 267   CFRelease(hid_device);
 268 }
 269
 270 scoped_refptr<HidConnection> HidServiceMac::Connect(
 271     const HidDeviceId& device_id) {
 272   DCHECK(thread_checker_.CalledOnValidThread());
 273   HidDeviceInfo device_info;
 274   if (!GetDeviceInfo(device_id, &device_info))
 275     return NULL;
 276   return scoped_refptr<HidConnection>(new HidConnectionMac(device_info));
 277 }
 278
 279 }  // namespace device