144 lines
3.8 KiB
C++
144 lines
3.8 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/capella_cm3602.h>
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#include <cutils/log.h>
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#include "ProximitySensor.h"
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/*****************************************************************************/
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ProximitySensor::ProximitySensor()
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: SensorBase(CM_DEVICE_NAME, "proximity_sensor"),
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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_P;
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mPendingEvent.type = SENSOR_TYPE_PROXIMITY;
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memset(mPendingEvent.data, 0, sizeof(mPendingEvent.data));
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if (data_fd) {
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strcpy(input_sysfs_path, "/sys/class/input/");
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strcat(input_sysfs_path, input_name);
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strcat(input_sysfs_path, "/device/");
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input_sysfs_path_len = strlen(input_sysfs_path);
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enable(0, 1);
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}
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}
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ProximitySensor::~ProximitySensor() {
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if (mEnabled) {
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enable(0, 0);
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}
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}
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int ProximitySensor::setInitialState() {
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struct input_absinfo absinfo;
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if (!ioctl(data_fd, EVIOCGABS(EVENT_TYPE_PROXIMITY), &absinfo)) {
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// make sure to report an event immediately
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mHasPendingEvent = true;
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mPendingEvent.distance = indexToValue(absinfo.value);
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}
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return 0;
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}
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int ProximitySensor::enable(int32_t, int en) {
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int flags = en ? 1 : 0;
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if (flags != mEnabled) {
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int fd;
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strcpy(&input_sysfs_path[input_sysfs_path_len], "enable");
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fd = open(input_sysfs_path, O_RDWR);
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if (fd >= 0) {
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char buf[2];
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buf[1] = 0;
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if (flags) {
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buf[0] = '1';
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} else {
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buf[0] = '0';
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}
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write(fd, buf, sizeof(buf));
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close(fd);
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mEnabled = flags;
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setInitialState();
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return 0;
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}
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return -1;
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}
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return 0;
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}
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bool ProximitySensor::hasPendingEvents() const {
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return mHasPendingEvent;
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}
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int ProximitySensor::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_PROXIMITY) {
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mPendingEvent.distance = indexToValue(event->value);
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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("ProximitySensor: 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 ProximitySensor::indexToValue(size_t index) const
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{
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return index * PROXIMITY_THRESHOLD_CM;
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}
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