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/*
* Copyright (C) 2015 Intel Corp
*
* 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 <stdlib.h>
#include <string.h>
#include <poll.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/select.h>
#include <cutils/log.h>
#include <cutils/properties.h>
#include "AlsSensor.h"
#define ALS_DATA_NAME "tsl2584 ambient light sensor"
#define SYSFS_ENABLE_FILE "/sys/class/i2c-adapter/i2c-6/6-0029/als_enable"
#define SYSFS_POLL_FILE "/sys/class/i2c-adapter/i2c-6/6-0029/als_delay"
/*****************************************************************************/
#define FIRST_GOOD_EVENT 1
LightSensor::LightSensor()
: SensorBase(NULL, ALS_DATA_NAME),
mEnabled(0),
mEventsSinceEnable(0),
mInputReader(4),
mHasPendingEvent(false)
{
mPendingEvent.version = sizeof(sensors_event_t);
mPendingEvent.sensor = ID_L;
mPendingEvent.type = SENSOR_TYPE_LIGHT;
memset(mPendingEvent.data, 0, sizeof(mPendingEvent.data));
}
LightSensor::~LightSensor() {
if (mEnabled) {
enable(0, 0);
}
}
int LightSensor::setDelay(int32_t /* handle */, int64_t ns)
{
int fd;
int len, ms, ret = -1;
char buf[6];
ms = ns / 1000000;
fd = open(SYSFS_POLL_FILE, O_RDWR);
if (fd) {
len = 6;
memset(buf, 0, len);
snprintf(buf, len, "%d", ms);
write(fd, buf, sizeof(buf));
close(fd);
ret = 0;
} else
ALOGE("file open failure\n");
return ret;
}
int LightSensor::enable(int32_t /* handle */, int en)
{
int flags = en ? 1 : 0;
mEventsSinceEnable = 0;
mPreviousLight = -1;
if (flags != mEnabled) {
int fd;
fd = open(SYSFS_ENABLE_FILE, O_RDWR);
if (fd >= 0) {
char buf[2];
buf[1] = 0;
if (flags) {
buf[0] = '1';
} else {
buf[0] = '0';
}
write(fd, buf, sizeof(buf));
close(fd);
mEnabled = flags;
return 0;
}
return -1;
}
if (en)
mEnabled=1;
else
mEnabled=0;
return 0;
}
int LightSensor::isActivated(int /* handle */)
{
return mEnabled;
}
#ifdef HAL_VERSION_GT_1_0
int LightSensor::batch(int /* handle */, int /* flags */, int64_t period_ns, int64_t /* timeout */)
{
int fd;
int len, ms, ret = -1;
char buf[6];
ms = period_ns / 1000000;
fd = open(SYSFS_POLL_FILE, O_RDWR);
if (fd) {
len = 6;
memset(buf, 0, len);
snprintf(buf, len, "%d", ms);
write(fd, buf, sizeof(buf));
close(fd);
ret = 0;
}
else
ALOGE("file open failure\n");
return ret;
}
#endif
bool LightSensor::hasPendingEvents() const {
return mHasPendingEvent;
}
int LightSensor::readEvents(sensors_event_t* data, int count)
{
if (count < 1)
return -EINVAL;
if (mHasPendingEvent) {
mHasPendingEvent = false;
mPendingEvent.timestamp = getTimestamp();
*data = mPendingEvent;
return mEnabled ? 1 : 0;
}
ssize_t n = mInputReader.fill(data_fd);
if (n < 0)
return n;
int numEventReceived = 0;
input_event const* event;
while (count && mInputReader.readEvent(&event)) {
int type = event->type;
if (type == EV_MSC) {
if (event->code == EVENT_TYPE_LIGHT) {
mPendingEvent.light = event->value;
if (mEventsSinceEnable < FIRST_GOOD_EVENT)
mEventsSinceEnable++;
}
} else if (type == EV_SYN) {
mPendingEvent.timestamp = timevalToNano(event->time);
if (mEnabled && (mPendingEvent.light != mPreviousLight) &&
mEventsSinceEnable >= FIRST_GOOD_EVENT) {
*data++ = mPendingEvent;
count--;
numEventReceived++;
mPreviousLight = mPendingEvent.light;
}
} else {
ALOGE("LightSensor: unknown event (type=%d, code=%d)",
type, event->code);
}
mInputReader.next();
}
return numEventReceived;
}
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