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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/mac/bluetooth_utility.h"
#import <Foundation/Foundation.h>
#include <IOKit/IOKitLib.h>
#include "base/mac/foundation_util.h"
#include "base/mac/mac_util.h"
#include "base/mac/scoped_ioobject.h"
#include "base/mac/sdk_forward_declarations.h"
namespace bluetooth_utility {
BluetoothAvailability GetBluetoothAvailability() {
base::ScopedCFTypeRef<CFMutableDictionaryRef> matching_dict(
IOServiceMatching("IOBluetoothHCIController"));
if (!matching_dict)
return BLUETOOTH_AVAILABILITY_ERROR;
// IOServiceGetMatchingServices takes ownership of matching_dict.
io_iterator_t iter;
int kr = IOServiceGetMatchingServices(
kIOMasterPortDefault, matching_dict.release(), &iter);
if (kr != KERN_SUCCESS)
return BLUETOOTH_NOT_AVAILABLE;
base::mac::ScopedIOObject<io_iterator_t> scoped_iter(iter);
int bluetooth_available = false;
base::mac::ScopedIOObject<io_service_t> device;
while (device.reset(IOIteratorNext(scoped_iter.get())), device) {
bluetooth_available = true;
CFMutableDictionaryRef dict;
kr = IORegistryEntryCreateCFProperties(
device, &dict, kCFAllocatorDefault, kNilOptions);
if (kr != KERN_SUCCESS)
continue;
base::ScopedCFTypeRef<CFMutableDictionaryRef> scoped_dict(dict);
NSDictionary* objc_dict = base::mac::CFToNSCast(scoped_dict.get());
NSNumber* lmp_version =
base::mac::ObjCCast<NSNumber>([objc_dict objectForKey:@"LMPVersion"]);
if (!lmp_version)
continue;
// The LMP version is too low to support Bluetooth LE.
if ([lmp_version intValue] < 6)
continue;
// Check the supported features registry entry for Bluetooth LE
// availability. The relevant bit has a different meaning on OSX 10.6, and
// could change again in the future.
if (base::mac::IsOSSnowLeopard())
return BLUETOOTH_AVAILABLE_LE_UNKNOWN;
NSData* data = base::mac::ObjCCast<NSData>(
[objc_dict objectForKey:@"HCISupportedFeatures"]);
NSUInteger supported_features_index = 4;
NSUInteger length = [data length];
if (length < supported_features_index + 1)
continue;
// The bytes are indexed in reverse order.
NSUInteger index = length - supported_features_index - 1;
const unsigned char* bytes =
static_cast<const unsigned char*>([data bytes]);
const unsigned char byte = bytes[index];
bool le_supported = byte & kBluetoothFeatureLESupportedController;
if (le_supported)
return BLUETOOTH_AVAILABLE_WITH_LE;
}
return bluetooth_available ? BLUETOOTH_AVAILABLE_WITHOUT_LE
: BLUETOOTH_AVAILABILITY_ERROR;
}
} // namespace bluetooth_utility
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