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/*
* Copyright (C) 2011 Samsung
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <fcntl.h>
#include <errno.h>
#include <math.h>
#include <poll.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/select.h>
#include <cutils/log.h>
#include <pthread.h>
#include "LightSensor.h"
LightSensor::LightSensor()
: SamsungSensorBase(NULL, "lightsensor-level", ABS_MISC)
{
mPendingEvent.sensor = ID_L;
mPendingEvent.type = SENSOR_TYPE_LIGHT;
}
bool LightSensor::handleEvent(input_event const *event) {
if (event->value == -1) {
return false;
}
// Convert adc value to lux assuming:
// I = 10 * log(Ev) uA
// R = 24kOhm
// Max adc value 1023 = 1.25V
// 1/4 of light reaches sensor
mPendingEvent.light = powf(10, event->value * (125.0f / 1023.0f / 24.0f)) * 4;
return true;
}
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