155 lines
4.0 KiB
C++
155 lines
4.0 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <fcntl.h>
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#include <errno.h>
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#include <math.h>
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#include <poll.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <sys/select.h>
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#include <linux/lightsensor.h>
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#include <cutils/log.h>
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#include "LightSensor.h"
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/*****************************************************************************/
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LightSensor::LightSensor()
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: SensorBase(LS_DEVICE_NAME, "lightsensor-level"),
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mEnabled(0),
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mInputReader(4),
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mHasPendingEvent(false)
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{
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mPendingEvent.version = sizeof(sensors_event_t);
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mPendingEvent.sensor = ID_L;
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mPendingEvent.type = SENSOR_TYPE_LIGHT;
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memset(mPendingEvent.data, 0, sizeof(mPendingEvent.data));
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open_device();
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int flags = 0;
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if (!ioctl(dev_fd, LIGHTSENSOR_IOCTL_GET_ENABLED, &flags)) {
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if (flags) {
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mEnabled = 1;
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setInitialState();
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}
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}
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if (!mEnabled) {
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close_device();
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}
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}
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LightSensor::~LightSensor() {
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}
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int LightSensor::setInitialState() {
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struct input_absinfo absinfo;
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if (!ioctl(data_fd, EVIOCGABS(EVENT_TYPE_LIGHT), &absinfo)) {
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mPendingEvent.light = indexToValue(absinfo.value);
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mHasPendingEvent = true;
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}
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return 0;
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}
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int LightSensor::enable(int32_t, int en) {
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int flags = en ? 1 : 0;
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int err = 0;
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if (flags != mEnabled) {
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if (!mEnabled) {
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open_device();
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}
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err = ioctl(dev_fd, LIGHTSENSOR_IOCTL_ENABLE, &flags);
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err = err<0 ? -errno : 0;
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LOGE_IF(err, "LIGHTSENSOR_IOCTL_ENABLE failed (%s)", strerror(-err));
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if (!err) {
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mEnabled = en ? 1 : 0;
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if (en) {
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setInitialState();
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}
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}
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if (!mEnabled) {
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close_device();
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}
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}
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return err;
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}
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bool LightSensor::hasPendingEvents() const {
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return mHasPendingEvent;
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}
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int LightSensor::readEvents(sensors_event_t* data, int count)
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{
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if (count < 1)
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return -EINVAL;
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if (mHasPendingEvent) {
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mHasPendingEvent = false;
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mPendingEvent.timestamp = getTimestamp();
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*data = mPendingEvent;
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return mEnabled ? 1 : 0;
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}
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ssize_t n = mInputReader.fill(data_fd);
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if (n < 0)
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return n;
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int numEventReceived = 0;
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input_event const* event;
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while (count && mInputReader.readEvent(&event)) {
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int type = event->type;
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if (type == EV_ABS) {
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if (event->code == EVENT_TYPE_LIGHT) {
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if (event->value != -1) {
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// FIXME: not sure why we're getting -1 sometimes
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mPendingEvent.light = indexToValue(event->value);
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}
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}
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} else if (type == EV_SYN) {
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mPendingEvent.timestamp = timevalToNano(event->time);
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if (mEnabled) {
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*data++ = mPendingEvent;
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count--;
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numEventReceived++;
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}
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} else {
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LOGE("LightSensor: unknown event (type=%d, code=%d)",
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type, event->code);
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}
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mInputReader.next();
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}
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return numEventReceived;
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}
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float LightSensor::indexToValue(size_t index) const
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{
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static const float luxValues[8] = {
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10.0, 160.0, 225.0, 320.0,
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640.0, 1280.0, 2600.0, 10240.0
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};
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const size_t maxIndex = sizeof(luxValues)/sizeof(*luxValues) - 1;
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if (index > maxIndex)
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index = maxIndex;
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return luxValues[index];
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}
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