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/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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 <linux/kxtf9.h>
#include "KionixSensor.h"
#define KIONIX_IOCTL_ENABLE_OUTPUT KXTF9_IOCTL_ENABLE_OUTPUT
#define KIONIX_IOCTL_DISABLE_OUTPUT KXTF9_IOCTL_DISABLE_OUTPUT
#define KIONIX_IOCTL_GET_ENABLE KXTF9_IOCTL_GET_ENABLE
#define KIONIX_IOCTL_UPDATE_ODR KXTF9_IOCTL_UPDATE_ODR
#define KIONIX_UNIT_CONVERSION(value) ((value) * GRAVITY_EARTH / (1024.0f))
/*****************************************************************************/
KionixSensor::KionixSensor()
: SensorBase(DIR_DEV, INPUT_NAME_ACC),
mEnabled(0),
mDelay(-1),
mInputReader(32),
mHasPendingEvent(false)
{
mPendingEvent.version = sizeof(sensors_event_t);
mPendingEvent.sensor = ID_A;
mPendingEvent.type = SENSOR_TYPE_ACCELEROMETER;
memset(mPendingEvent.data, 0, sizeof(mPendingEvent.data));
open_device();
}
KionixSensor::~KionixSensor() {
if (mEnabled) {
setEnable(0, 0);
}
close_device();
}
int KionixSensor::setInitialState() {
struct input_absinfo absinfo;
if (mEnabled) {
if (!ioctl(data_fd, EVIOCGABS(EVENT_TYPE_ACCEL_X), &absinfo)) {
mPendingEvent.acceleration.x = KIONIX_UNIT_CONVERSION(absinfo.value);
}
if (!ioctl(data_fd, EVIOCGABS(EVENT_TYPE_ACCEL_Y), &absinfo)) {
mPendingEvent.acceleration.y = KIONIX_UNIT_CONVERSION(absinfo.value);
}
if (!ioctl(data_fd, EVIOCGABS(EVENT_TYPE_ACCEL_Z), &absinfo)) {
mPendingEvent.acceleration.z = KIONIX_UNIT_CONVERSION(absinfo.value);
}
}
return 0;
}
bool KionixSensor::hasPendingEvents() const {
return mHasPendingEvent;
}
int KionixSensor::setEnable(int32_t handle, int enabled) {
int err = 0;
int opDone = 0;
/* handle check */
if (handle != ID_A) {
ALOGE("KionixSensor: Invalid handle (%d)", handle);
return -EINVAL;
}
if (mEnabled <= 0) {
if (enabled) {
err = ioctl(dev_fd, KIONIX_IOCTL_ENABLE_OUTPUT);
opDone = 1;
}
} else if (mEnabled == 1) {
if (!enabled) {
err = ioctl(dev_fd, KIONIX_IOCTL_DISABLE_OUTPUT);
opDone = 1;
}
}
if (err != 0) {
ALOGE("KionixSensor: IOCTL failed (%s)", strerror(errno));
return err;
}
if (opDone) {
ALOGD("KionixSensor: Control set %d", enabled);
setInitialState();
}
if (enabled) {
mEnabled++;
if (mEnabled > 32767) mEnabled = 32767;
} else {
mEnabled--;
if (mEnabled < 0) mEnabled = 0;
}
ALOGD("KionixSensor: mEnabled = %d", mEnabled);
return err;
}
int KionixSensor::setDelay(int32_t handle, int64_t delay_ns)
{
int err = 0;
int ms;
/* handle check */
if (handle != ID_A) {
ALOGE("KionixSensor: Invalid handle (%d)", handle);
return -EINVAL;
}
if (mDelay != delay_ns) {
ms = delay_ns / 1000000;
if (ioctl(dev_fd, KIONIX_IOCTL_UPDATE_ODR, &ms)) {
return -errno;
}
mDelay = delay_ns;
}
return err;
}
int64_t KionixSensor::getDelay(int32_t handle)
{
return (handle == ID_A) ? mDelay : 0;
}
int KionixSensor::getEnable(int32_t handle)
{
return (handle == ID_A) ? mEnabled : 0;
}
int KionixSensor::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_ABS) {
float value = event->value;
if (event->code == EVENT_TYPE_ACCEL_X) {
mPendingEvent.acceleration.x = KIONIX_UNIT_CONVERSION(value);
} else if (event->code == EVENT_TYPE_ACCEL_Y) {
mPendingEvent.acceleration.y = KIONIX_UNIT_CONVERSION(value);
} else if (event->code == EVENT_TYPE_ACCEL_Z) {
mPendingEvent.acceleration.z = KIONIX_UNIT_CONVERSION(value);
}
} else if (type == EV_SYN) {
mPendingEvent.timestamp = timevalToNano(event->time);
if (mEnabled) {
*data++ = mPendingEvent;
count--;
numEventReceived++;
}
} else {
ALOGE("KionixSensor: unknown event (type=%d, code=%d)",
type, event->code);
}
mInputReader.next();
}
return numEventReceived;
}
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