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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/power_monitor/iopm_power_source_sampling_event_source.h"
#include <IOKit/IOMessage.h>
#include <dispatch/queue.h>
#include "base/check.h"
#include "base/logging.h"
namespace base {
IOPMPowerSourceSamplingEventSource::IOPMPowerSourceSamplingEventSource() =
default;
IOPMPowerSourceSamplingEventSource::~IOPMPowerSourceSamplingEventSource() =
default;
bool IOPMPowerSourceSamplingEventSource::Start(SamplingEventCallback callback) {
DCHECK(!callback_);
DCHECK(callback);
callback_ = callback;
service_.reset(IOServiceGetMatchingService(
kIOMasterPortDefault, IOServiceMatching("IOPMPowerSource")));
if (!service_) {
VLOG(1) << "IOPMPowerSource service not found. This is expected on desktop "
"Macs.";
return false;
}
notify_port_.reset(IONotificationPortCreate(kIOMasterPortDefault));
if (!notify_port_.is_valid()) {
LOG(ERROR) << "Could not create a notification port";
return false;
}
IONotificationPortSetDispatchQueue(notify_port_.get(),
dispatch_get_main_queue());
kern_return_t result = IOServiceAddInterestNotification(
notify_port_.get(), service_.get(), kIOGeneralInterest, OnNotification,
this, notification_.InitializeInto());
if (result != KERN_SUCCESS) {
LOG(ERROR) << "Could not register to IOPMPowerSource notifications";
return false;
}
return true;
}
// static
void IOPMPowerSourceSamplingEventSource::OnNotification(
void* context,
io_service_t service,
natural_t message_type,
void* message_argument) {
IOPMPowerSourceSamplingEventSource* self =
static_cast<IOPMPowerSourceSamplingEventSource*>(context);
self->callback_.Run();
}
} // namespace base
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