/*
 * 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 <stdio.h>
#include <math.h>

#include "MmaSensor.h"
#include "mma8452_kernel.h"

extern "C"
{
    #include "AccCali.h"
}

/*****************************************************************************/

MmaSensor::MmaSensor()
: SensorBase(MMA_DEVICE_NAME, "gsensor"),
      mEnabled(0),
      mInputReader(32)
{
    memset(accel_offset, 0, sizeof(accel_offset));

    mPendingEvent.version = sizeof(sensors_event_t);
    mPendingEvent.sensor = ID_A;
    mPendingEvent.type = SENSOR_TYPE_ACCELEROMETER;
    mPendingEvent.acceleration.status = SENSOR_STATUS_ACCURACY_HIGH;
    memset(mPendingEvent.data, 0, sizeof(mPendingEvent.data));

    mDelay = 200000000; // 200 ms by default

    open_device();

    readCalibration();
}

MmaSensor::~MmaSensor() {
    if (mEnabled) {
        enable(0, 0);
    }
    if (dev_fd > 0) {
        close(dev_fd);
        dev_fd = -1;
    }
}

int MmaSensor::enable(int32_t /* handle */, int en)
{
    int newState  = en ? 1 : 0;
    int err = 0;

    if ((int)mEnabled != newState) {
        if (dev_fd < 0) {
            open_device();
        }

        if (1 == newState) {
            if (0 > (err = ioctl(dev_fd, GSENSOR_IOCTL_START))) {
                LOGE("fail to perform GSENSOR_IOCTL_START, err = %d, error is '%s'", err, strerror(errno));
                goto EXIT;
            }
        }
        else {
            if (0 > (err = ioctl(dev_fd, GSENSOR_IOCTL_CLOSE))) {
                LOGE("fail to perform GSENSOR_IOCTL_CLOSE, err = %d, error is '%s'", err, strerror(errno));
                goto EXIT;
            }
        }
        mEnabled = newState;
    }

EXIT:
    return err;
}

int MmaSensor::setDelay(int32_t /* handle */, int64_t ns)
{
    if (ns < 0)
        return -EINVAL;

    mDelay = ns;
    return update_delay();
}

int MmaSensor::update_delay()
{
    int result = 0;

    if (dev_fd < 0)
        open_device();

    short delay = mDelay / 1000000;
    LOGI("MmaSensor update delay: %dms\n", delay);

    if (0 > (result = ioctl(dev_fd, GSENSOR_IOCTL_APP_SET_RATE, &delay))) {
        LOGE("fail to perform GSENSOR_IOCTL_APP_SET_RATE, result = %d, error is '%s'", result, strerror(errno));
    }
    else {
        LOGD("update gsensor delay to %d ms\n", delay);
    }
    return result;
}

int MmaSensor::isActivated(int /* handle */)
{
    return mEnabled;
}

int MmaSensor::readEvents(sensors_event_t* data, int count)
{
    if (count < 1)
        return -EINVAL;

    ssize_t n = mInputReader.fill(data_fd);
    if (n < 0)
        return n;

    int numEventReceived = 0;       /* 已经接受的 event 的数量, 待返回. */
    input_event const* event;

    while (count && mInputReader.readEvent(&event)) {
        int type = event->type;
        if (type == EV_ABS) {
            processEvent(event->code, event->value);
        } else if (type == EV_SYN) {
            mPendingEvent.timestamp = getTimestamp();
            *data++ = mPendingEvent;
            count--;
            numEventReceived++;
        } else {
            LOGE("MmaSensor: unknown event (type=%d, code=%d)",
                    type, event->code);
        }
        mInputReader.next();
    }

    return numEventReceived;
}

void MmaSensor::processEvent(int code, int value)
{
#ifndef GSENSOR_MXC6655XA_SUPPORT
    switch (code) {
        case EVENT_TYPE_ACCEL_X:
            mPendingEvent.acceleration.x = (value - accel_offset[0]) * ACCELERATION_RATIO_ANDROID_TO_HW;
            break;
        case EVENT_TYPE_ACCEL_Y:
            mPendingEvent.acceleration.y = (value - accel_offset[1]) * ACCELERATION_RATIO_ANDROID_TO_HW;
            break;
        case EVENT_TYPE_ACCEL_Z:
            mPendingEvent.acceleration.z = (value - accel_offset[2]) * ACCELERATION_RATIO_ANDROID_TO_HW;
            break;
    }
#else
   static float fAccRawData[3] = {0.0};
   float dataOut[3] = {0.0};
   int returnFlag = 0;

   switch (code) {
       case EVENT_TYPE_ACCEL_X:
           mPendingEvent.acceleration.x = (value - accel_offset[0]) * ACCELERATION_RATIO_ANDROID_TO_HW;
           fAccRawData[0]=mPendingEvent.acceleration.x / 9.80665;
           break;
       case EVENT_TYPE_ACCEL_Y:
           mPendingEvent.acceleration.y = (value - accel_offset[1]) * ACCELERATION_RATIO_ANDROID_TO_HW;
           fAccRawData[1]=mPendingEvent.acceleration.y / 9.80665;
           break;
       case EVENT_TYPE_ACCEL_Z:
           fAccRawData[2] =(value - accel_offset[2]) * ACCELERATION_RATIO_ANDROID_TO_HW / 9.80665;
           returnFlag = DynamicCali(fAccRawData, dataOut);
           if(returnFlag==2)
             LOGE("mxc4005 neet to handle aoz ");
           mPendingEvent.acceleration.z = dataOut[2] * 9.80665;
           break;
   }
#endif

}

void MmaSensor::readCalibration()
{
    if (dev_fd < 0)
        open_device();

    int result = ioctl(dev_fd, GSENSOR_IOCTL_GET_CALIBRATION, &accel_offset);
    if (result < 0)
        LOGE("fail to perform GSENSOR_IOCTL_GET_CALIBRATION, result = %d, error is '%s'", result, strerror(errno));
    else
        LOGI("gsensor calibration is %d, %d, %d\n", accel_offset[0], accel_offset[1], accel_offset[2]);
}