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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 "chrome/browser/mac/bluetooth_utility.h"
6
7#import <Foundation/Foundation.h>
8#include <IOKit/IOKitLib.h>
9
10#include "base/mac/foundation_util.h"
11#include "base/mac/mac_util.h"
12#include "base/mac/scoped_ioobject.h"
13#include "base/mac/sdk_forward_declarations.h"
14
15namespace bluetooth_utility {
16
17BluetoothAvailability GetBluetoothAvailability() {
18  base::ScopedCFTypeRef<CFMutableDictionaryRef> matching_dict(
19      IOServiceMatching("IOBluetoothHCIController"));
20  if (!matching_dict)
21    return BLUETOOTH_AVAILABILITY_ERROR;
22
23  // IOServiceGetMatchingServices takes ownership of matching_dict.
24  io_iterator_t iter;
25  int kr = IOServiceGetMatchingServices(
26      kIOMasterPortDefault, matching_dict.release(), &iter);
27  if (kr != KERN_SUCCESS)
28    return BLUETOOTH_NOT_AVAILABLE;
29  base::mac::ScopedIOObject<io_iterator_t> scoped_iter(iter);
30
31  int bluetooth_available = false;
32  base::mac::ScopedIOObject<io_service_t> device;
33  while (device.reset(IOIteratorNext(scoped_iter.get())), device) {
34    bluetooth_available = true;
35
36    CFMutableDictionaryRef dict;
37    kr = IORegistryEntryCreateCFProperties(
38        device, &dict, kCFAllocatorDefault, kNilOptions);
39    if (kr != KERN_SUCCESS)
40      continue;
41    base::ScopedCFTypeRef<CFMutableDictionaryRef> scoped_dict(dict);
42
43    NSDictionary* objc_dict = base::mac::CFToNSCast(scoped_dict.get());
44    NSNumber* lmp_version =
45        base::mac::ObjCCast<NSNumber>([objc_dict objectForKey:@"LMPVersion"]);
46    if (!lmp_version)
47      continue;
48
49    // The LMP version is too low to support Bluetooth LE.
50    if ([lmp_version intValue] < 6)
51      continue;
52
53    // Check the supported features registry entry for Bluetooth LE
54    // availability. The relevant bit has a different meaning on OSX 10.6, and
55    // could change again in the future.
56    if (base::mac::IsOSSnowLeopard())
57      return BLUETOOTH_AVAILABLE_LE_UNKNOWN;
58
59    NSData* data = base::mac::ObjCCast<NSData>(
60        [objc_dict objectForKey:@"HCISupportedFeatures"]);
61
62    NSUInteger supported_features_index = 4;
63    NSUInteger length = [data length];
64    if (length < supported_features_index + 1)
65      continue;
66
67    // The bytes are indexed in reverse order.
68    NSUInteger index = length - supported_features_index - 1;
69
70    const unsigned char* bytes =
71        static_cast<const unsigned char*>([data bytes]);
72    const unsigned char byte = bytes[index];
73    bool le_supported = byte & kBluetoothFeatureLESupportedController;
74    if (le_supported)
75      return BLUETOOTH_AVAILABLE_WITH_LE;
76  }
77
78  return bluetooth_available ? BLUETOOTH_AVAILABLE_WITHOUT_LE
79                             : BLUETOOTH_AVAILABILITY_ERROR;
80}
81
82}  // namespace bluetooth_utility
83