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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;
mPreviousLight = -1;
}
int LightSensor::handleEnable(int en) {
mPreviousLight = -1;
return 0;
}
bool LightSensor::handleEvent(input_event const *event) {
if (event->value == -1) {
return false;
}
mPendingEvent.light = indexToValue(event->value);
if (mPendingEvent.light != mPreviousLight) {
mPreviousLight = mPendingEvent.light;
return true;
}
return false;
}
float LightSensor::indexToValue(size_t index) const {
/* Driver gives a rolling average adc value. We convert it lux levels. */
static const struct adcToLux {
size_t adc_value;
float lux_value;
} adcToLux[] = {
{ 50, 10.0 }, /* from 0 - 50 adc, we map to 10.0 lux */
{ 280, 160.0 }, /* from 51 - 280 adc, we map to 160.0 lux */
{ 320, 225.0 }, /* from 281 - 320 adc, we map to 225.0 lux */
{ 350, 320.0 }, /* from 321 - 350 adc, we map to 320.0 lux */
{ 400, 640.0 }, /* from 351 - 400 adc, we map to 640.0 lux */
{ 520, 1280.0 }, /* from 401 - 520 adc, we map to 1280.0 lux */
{ 590, 2600.0 }, /* from 521 - 590 adc, we map to 2600.0 lux */
{ 1024, 10240.0 }, /* from 591 - 1024 adc, we map to 10240.0 lux */
};
size_t i;
for (i = 0; i < ARRAY_SIZE(adcToLux); i++) {
if (index <= adcToLux[i].adc_value) {
return adcToLux[i].lux_value;
}
}
return adcToLux[ARRAY_SIZE(adcToLux)-1].lux_value;
}
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