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- // Copyright 2016 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 "services/device/generic_sensor/platform_sensor_ambient_light_mac.h"
- #include <stdint.h>
- #include <IOKit/IOMessage.h>
- #include "base/bind.h"
- #include "base/time/time.h"
- #include "device/base/synchronization/shared_memory_seqlock_buffer.h"
- #include "services/device/generic_sensor/generic_sensor_consts.h"
- #include "services/device/generic_sensor/platform_sensor_provider_mac.h"
- #include "services/device/public/cpp/generic_sensor/sensor_traits.h"
- namespace {
- // Convert the value returned by the ambient light LMU sensor on Mac
- // hardware to a lux value.
- double LMUvalueToLux(uint64_t raw_value) {
- // Conversion formula from regression.
- // https://bugzilla.mozilla.org/show_bug.cgi?id=793728
- // Let x = raw_value, then
- // lux = -2.978303814*(10^-27)*x^4 + 2.635687683*(10^-19)*x^3 -
- // 3.459747434*(10^-12)*x^2 + 3.905829689*(10^-5)*x - 0.1932594532
- static const long double k4 = pow(10.L, -7);
- static const long double k3 = pow(10.L, -4);
- static const long double k2 = pow(10.L, -2);
- static const long double k1 = pow(10.L, 5);
- long double scaled_value = raw_value / k1;
- long double lux_value =
- (-3 * k4 * pow(scaled_value, 4)) + (2.6 * k3 * pow(scaled_value, 3)) +
- (-3.4 * k2 * pow(scaled_value, 2)) + (3.9 * scaled_value) - 0.19;
- double lux = ceil(static_cast<double>(lux_value));
- return lux > 0 ? lux : 0;
- }
- } // namespace
- namespace device {
- using mojom::SensorType;
- enum LmuFunctionIndex {
- kGetSensorReadingID = 0, // getSensorReading(int *, int *)
- };
- PlatformSensorAmbientLightMac::PlatformSensorAmbientLightMac(
- SensorReadingSharedBuffer* reading_buffer,
- PlatformSensorProvider* provider)
- : PlatformSensor(SensorType::AMBIENT_LIGHT, reading_buffer, provider),
- light_sensor_port_(nullptr),
- current_lux_(0.0) {}
- PlatformSensorAmbientLightMac::~PlatformSensorAmbientLightMac() = default;
- mojom::ReportingMode PlatformSensorAmbientLightMac::GetReportingMode() {
- return mojom::ReportingMode::ON_CHANGE;
- }
- bool PlatformSensorAmbientLightMac::CheckSensorConfiguration(
- const PlatformSensorConfiguration& configuration) {
- return configuration.frequency() > 0 &&
- configuration.frequency() <=
- SensorTraits<SensorType::AMBIENT_LIGHT>::kMaxAllowedFrequency;
- }
- PlatformSensorConfiguration
- PlatformSensorAmbientLightMac::GetDefaultConfiguration() {
- PlatformSensorConfiguration default_configuration;
- default_configuration.set_frequency(
- SensorTraits<SensorType::AMBIENT_LIGHT>::kDefaultFrequency);
- return default_configuration;
- }
- void PlatformSensorAmbientLightMac::IOServiceCallback(void* context,
- io_service_t service,
- natural_t message_type,
- void* message_argument) {
- PlatformSensorAmbientLightMac* sensor =
- static_cast<PlatformSensorAmbientLightMac*>(context);
- if (!sensor->ReadAndUpdate()) {
- sensor->NotifySensorError();
- sensor->StopSensor();
- }
- }
- bool PlatformSensorAmbientLightMac::StartSensor(
- const PlatformSensorConfiguration& configuration) {
- // Tested and verified by riju that the following call works on
- // MacBookPro9,1 : Macbook Pro 15" (Mid 2012 model)
- // MacBookPro10,1 : Macbook Pro 15" (Retina Display, Early 2013 model).
- // MacBookPro10,2 : Macbook Pro 13" (Retina Display, Early 2013 model).
- // MacBookAir5,2 : Macbook Air 13" (Mid 2012 model) (by François Beaufort).
- // MacBookAir6,2 : Macbook Air 13" (Mid 2013 model).
- // Testing plans : please download the code and follow the comments :-
- // https://gist.github.com/riju/74af8c81a665e412d122/
- // and add an entry here about the model and the status returned by the code.
- // Look up a registered IOService object whose class is AppleLMUController.
- light_sensor_service_.reset(IOServiceGetMatchingService(
- kIOMasterPortDefault, IOServiceMatching("AppleLMUController")));
- // Return early if the ambient light sensor is not present.
- if (!light_sensor_service_)
- return false;
- light_sensor_port_.reset(IONotificationPortCreate(kIOMasterPortDefault));
- if (!light_sensor_port_.is_valid())
- return false;
- IONotificationPortSetDispatchQueue(
- light_sensor_port_.get(),
- dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0));
- kern_return_t kr = IOServiceAddInterestNotification(
- light_sensor_port_.get(), light_sensor_service_, kIOGeneralInterest,
- IOServiceCallback, this, light_sensor_notification_.InitializeInto());
- if (kr != KERN_SUCCESS)
- return false;
- kr = IOServiceAddInterestNotification(
- light_sensor_port_.get(), light_sensor_service_, kIOBusyInterest,
- IOServiceCallback, this,
- light_sensor_busy_notification_.InitializeInto());
- if (kr != KERN_SUCCESS)
- return false;
- kr = IOServiceOpen(light_sensor_service_, mach_task_self(), 0,
- light_sensor_object_.InitializeInto());
- if (kr != KERN_SUCCESS)
- return false;
- bool success = ReadAndUpdate();
- if (!success)
- StopSensor();
- return success;
- }
- void PlatformSensorAmbientLightMac::StopSensor() {
- light_sensor_port_.reset();
- light_sensor_notification_.reset();
- light_sensor_busy_notification_.reset();
- light_sensor_object_.reset();
- light_sensor_service_.reset();
- current_lux_ = 0.0;
- }
- bool PlatformSensorAmbientLightMac::ReadAndUpdate() {
- uint32_t scalar_output_count = 2;
- uint64_t lux_values[2];
- kern_return_t kr = IOConnectCallMethod(
- light_sensor_object_, LmuFunctionIndex::kGetSensorReadingID, nullptr, 0,
- nullptr, 0, lux_values, &scalar_output_count, nullptr, 0);
- if (kr != KERN_SUCCESS)
- return false;
- uint64_t mean = (lux_values[0] + lux_values[1]) / 2;
- double lux = LMUvalueToLux(mean);
- if (lux == current_lux_)
- return true;
- current_lux_ = lux;
- SensorReading reading;
- reading.als.timestamp =
- (base::TimeTicks::Now() - base::TimeTicks()).InSecondsF();
- reading.als.value = current_lux_;
- UpdateSharedBufferAndNotifyClients(reading);
- return true;
- }
- } // namespace device
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