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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "Hal.h"
#include "nsITimer.h"
#include "smslib.h"
#include "nsComponentManagerUtils.h"
#include <mach/mach.h>
#include <cmath>
#import <IOKit/IOKitLib.h>
#define MEAN_GRAVITY 9.80665
#define DEFAULT_SENSOR_POLL 100
using namespace mozilla::hal;
namespace mozilla {
namespace hal_impl {
static nsITimer* sUpdateTimer = nullptr;
static bool sActiveSensors[NUM_SENSOR_TYPE];
static io_connect_t sDataPort = IO_OBJECT_NULL;
static uint64_t sLastMean = -1;
static float
LMUvalueToLux(uint64_t aValue)
{
//Conversion formula from regression. See Bug 793728.
// -3*(10^-27)*x^4 + 2.6*(10^-19)*x^3 + -3.4*(10^-12)*x^2 + 3.9*(10^-5)*x - 0.19
long double powerC4 = 1/pow((long double)10,27);
long double powerC3 = 1/pow((long double)10,19);
long double powerC2 = 1/pow((long double)10,12);
long double powerC1 = 1/pow((long double)10,5);
long double term4 = -3.0 * powerC4 * pow(aValue,4);
long double term3 = 2.6 * powerC3 * pow(aValue,3);
long double term2 = -3.4 * powerC2 * pow(aValue,2);
long double term1 = 3.9 * powerC1 * aValue;
float lux = ceil(static_cast<float>(term4 + term3 + term2 + term1 - 0.19));
return lux > 0 ? lux : 0;
}
void
UpdateHandler(nsITimer *aTimer, void *aClosure)
{
for (int i = 0; i < NUM_SENSOR_TYPE; i++) {
if (!sActiveSensors[i]) {
continue;
}
SensorType sensor = static_cast<SensorType>(i);
InfallibleTArray<float> values;
if (sensor == SENSOR_ACCELERATION) {
sms_acceleration accel;
smsGetData(&accel);
values.AppendElement(accel.x * MEAN_GRAVITY);
values.AppendElement(accel.y * MEAN_GRAVITY);
values.AppendElement(accel.z * MEAN_GRAVITY);
} else if (sensor == SENSOR_LIGHT && sDataPort != IO_OBJECT_NULL) {
kern_return_t kr;
uint32_t outputs = 2;
uint64_t lightLMU[outputs];
kr = IOConnectCallMethod(sDataPort, 0, nil, 0, nil, 0, lightLMU, &outputs, nil, 0);
if (kr == KERN_SUCCESS) {
uint64_t mean = (lightLMU[0] + lightLMU[1]) / 2;
if (mean == sLastMean) {
continue;
}
sLastMean = mean;
values.AppendElement(LMUvalueToLux(mean));
} else if (kr == kIOReturnBusy) {
continue;
}
}
hal::SensorData sdata(sensor,
PR_Now(),
values,
hal::SENSOR_ACCURACY_UNKNOWN);
hal::NotifySensorChange(sdata);
}
}
void
EnableSensorNotifications(SensorType aSensor)
{
if (aSensor == SENSOR_ACCELERATION) {
int result = smsStartup(nil, nil);
if (result != SMS_SUCCESS) {
return;
}
if (!smsLoadCalibration()) {
return;
}
} else if (aSensor == SENSOR_LIGHT) {
io_service_t serviceObject;
serviceObject = IOServiceGetMatchingService(kIOMasterPortDefault,
IOServiceMatching("AppleLMUController"));
if (!serviceObject) {
return;
}
kern_return_t kr;
kr = IOServiceOpen(serviceObject, mach_task_self(), 0, &sDataPort);
IOObjectRelease(serviceObject);
if (kr != KERN_SUCCESS) {
return;
}
} else {
NS_WARNING("EnableSensorNotifications called on an unknown sensor type");
return;
}
sActiveSensors[aSensor] = true;
if (!sUpdateTimer) {
CallCreateInstance("@mozilla.org/timer;1", &sUpdateTimer);
if (sUpdateTimer) {
sUpdateTimer->InitWithFuncCallback(UpdateHandler,
nullptr,
DEFAULT_SENSOR_POLL,
nsITimer::TYPE_REPEATING_SLACK);
}
}
}
void
DisableSensorNotifications(SensorType aSensor)
{
if (!sActiveSensors[aSensor] || (aSensor != SENSOR_ACCELERATION && aSensor != SENSOR_LIGHT)) {
return;
}
sActiveSensors[aSensor] = false;
if (aSensor == SENSOR_ACCELERATION) {
smsShutdown();
} else if (aSensor == SENSOR_LIGHT) {
IOServiceClose(sDataPort);
}
// If all sensors are disabled, cancel the update timer.
if (sUpdateTimer) {
for (int i = 0; i < NUM_SENSOR_TYPE; i++) {
if (sActiveSensors[i]) {
return;
}
}
sUpdateTimer->Cancel();
NS_RELEASE(sUpdateTimer);
}
}
} // namespace hal_impl
} // namespace mozilla
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