libsensors/sensors.cpp - device/lge/hammerhead - Git at Google

 /*
  * Copyright 2013 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 <hardware/sensors.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <dirent.h>
 #include <math.h>
 #include <poll.h>
 #include <pthread.h>
 #include <stdlib.h>

 #include <linux/input.h>

 #include <utils/Atomic.h>
 #include <utils/Log.h>

 #include "sensors.h"
 #include "MPLSensor.h"
 #include "LightSensor.h"
 #include "ProximitySensor.h"

 /*****************************************************************************/
 /* The SENSORS Module */

 #ifdef ENABLE_DMP_SCREEN_AUTO_ROTATION
 #define GLOBAL_SENSORS (MPLSensor::NumSensors + 1)
 #else
 #define GLOBAL_SENSORS MPLSensor::NumSensors
 #endif

 #define LOCAL_SENSORS (2)

 #define SENSORS_LIGHT_HANDLE        (ID_L)
 #define SENSORS_PROXIMITY_HANDLE    (ID_PX)

 static struct sensor_t sSensorList[GLOBAL_SENSORS + LOCAL_SENSORS] = {
     {
         .name       = "Light Sensor",
         .vendor     = "Avago Technologies",
         .version    = 1,
         .handle     = SENSORS_LIGHT_HANDLE,
         .type       = SENSOR_TYPE_LIGHT,
         .maxRange   = 30000.0f,
         .resolution = 1.0f,
         .power      = 0.5f,
         .minDelay   = 100000,
         .reserved   = {}
     },
     {
         .name       = "Proximity Sensor",
         .vendor     = "Avago Technologies",
         .version    = 1,
         .handle     = SENSORS_PROXIMITY_HANDLE,
         .type       = SENSOR_TYPE_PROXIMITY,
         .maxRange   = 5.0f,
         .resolution = 1.0f,
         .power      = 0.5f,
         .minDelay   = 100000,
         .reserved   = {}
     },
 };
 static int sensors = (sizeof(sSensorList) / sizeof(sensor_t));

 static int open_sensors(const struct hw_module_t* module, const char* id,
                         struct hw_device_t** device);

 static int sensors__get_sensors_list(struct sensors_module_t* module,
                                      struct sensor_t const** list)
 {
     *list = sSensorList;
     return sensors;
 }

 static struct hw_module_methods_t sensors_module_methods = {
         open: open_sensors
 };

 struct sensors_module_t HAL_MODULE_INFO_SYM = {
     common: {
         tag: HARDWARE_MODULE_TAG,
         version_major: 1,
         version_minor: 0,
         id: SENSORS_HARDWARE_MODULE_ID,
         name: "LGE Sensor module",
         author: "LG Electronics Inc.",
         methods: &sensors_module_methods,
         dso: NULL,
         reserved: {0}
     },
     get_sensors_list: sensors__get_sensors_list,
 };

 struct sensors_poll_context_t {
     sensors_poll_device_1_t device; // must be first

     sensors_poll_context_t();
     ~sensors_poll_context_t();
     int activate(int handle, int enabled);
     int setDelay(int handle, int64_t ns);
     int pollEvents(sensors_event_t* data, int count);
     int batch(int handle, int flags, int64_t period_ns, int64_t timeout);

     // return true if the constructor is completed
     bool isValid() { return mInitialized; };
     int flush(int handle);

 private:
     enum {
         mpl = 0,
         compass,
         dmpOrient,
         dmpSign,
         dmpPed,
         light,
         proximity,
         numSensorDrivers,   // wake pipe goes here
         numFds,
     };

     static const size_t wake = numFds - 1;
     static const char WAKE_MESSAGE = 'W';
     struct pollfd mPollFds[numFds];
     int mWritePipeFd;
     SensorBase *mSensor[numSensorDrivers];
     CompassSensor *mCompassSensor;
     // return true if the constructor is completed
     bool mInitialized;

     int handleToDriver(int handle) const {
         switch (handle) {
             case ID_GY:
             case ID_RG:
             case ID_A:
             case ID_M:
             case ID_RM:
             case ID_PS:
             case ID_O:
             case ID_RV:
             case ID_GRV:
             case ID_LA:
             case ID_GR:
             case ID_SM:
             case ID_P:
             case ID_SC:
             case ID_GMRV:
             case ID_SO:
                 return mpl;
             case ID_L:
                 return light;
             case ID_PX:
                 return proximity;
         }
         return -EINVAL;
     }
 };

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

 sensors_poll_context_t::sensors_poll_context_t() {
     /* TODO: Handle external pressure sensor */
     mCompassSensor = new CompassSensor();
     MPLSensor *mplSensor = new MPLSensor(mCompassSensor);
     mInitialized = false;
     // Must clean this up early or else the destructor will make a mess.
     memset(mSensor, 0, sizeof(mSensor));

     // setup the callback object for handing mpl callbacks
     setCallbackObject(mplSensor);

     // populate the sensor list
     sensors = LOCAL_SENSORS +
        mplSensor->populateSensorList(sSensorList + LOCAL_SENSORS,
                sizeof(sSensorList[0]) * (ARRAY_SIZE(sSensorList) - LOCAL_SENSORS));

     mSensor[mpl] = mplSensor;
     mPollFds[mpl].fd = mSensor[mpl]->getFd();
     mPollFds[mpl].events = POLLIN;
     mPollFds[mpl].revents = 0;

     mSensor[compass] = mplSensor;
     mPollFds[compass].fd = mCompassSensor->getFd();
     mPollFds[compass].events = POLLIN;
     mPollFds[compass].revents = 0;

     mSensor[dmpOrient] = mplSensor;
     mPollFds[dmpOrient].fd = ((MPLSensor*) mSensor[dmpOrient])->getDmpOrientFd();
     mPollFds[dmpOrient].events = POLLPRI;
     mPollFds[dmpOrient].revents = 0;

     mSensor[dmpSign] = mplSensor;
     mPollFds[dmpSign].fd = ((MPLSensor*) mSensor[dmpSign])->getDmpSignificantMotionFd();
     mPollFds[dmpSign].events = POLLPRI;
     mPollFds[dmpSign].revents = 0;

     mSensor[dmpPed] = mplSensor;
     mPollFds[dmpPed].fd = ((MPLSensor*) mSensor[dmpPed])->getDmpPedometerFd();
     mPollFds[dmpPed].events = POLLPRI;
     mPollFds[dmpPed].revents = 0;

     mSensor[light] = new LightSensor();
     mPollFds[light].fd = mSensor[light]->getFd();
     mPollFds[light].events = POLLIN;
     mPollFds[light].revents = 0;

     mSensor[proximity] = new ProximitySensor();
     mPollFds[proximity].fd = mSensor[proximity]->getFd();
     mPollFds[proximity].events = POLLIN;
     mPollFds[proximity].revents = 0;

     if (mPollFds[light].fd < 0 || mPollFds[proximity].fd < 0) {
         delete mCompassSensor;
         return;
     }

     /* Timer based sensor initialization */
     int wakeFds[2];
     int result = pipe(wakeFds);
     ALOGE_IF(result < 0, "error creating wake pipe (%s)", strerror(errno));
     fcntl(wakeFds[0], F_SETFL, O_NONBLOCK);
     fcntl(wakeFds[1], F_SETFL, O_NONBLOCK);
     mWritePipeFd = wakeFds[1];

     mPollFds[wake].fd = wakeFds[0];
     mPollFds[wake].events = POLLIN;
     mPollFds[wake].revents = 0;
     mInitialized = true;
 }

 sensors_poll_context_t::~sensors_poll_context_t() {
     for (int i=0 ; i<numSensorDrivers ; i++) {
         delete mSensor[i];
     }
     delete mCompassSensor;
     close(mPollFds[wake].fd);
     close(mWritePipeFd);
     mInitialized = false;
 }

 int sensors_poll_context_t::activate(int handle, int enabled) {
     if (!mInitialized) return -EINVAL;
     int index = handleToDriver(handle);
     if (index < 0) return index;
     int err =  mSensor[index]->enable(handle, enabled);
     if (!err) {
         const char wakeMessage(WAKE_MESSAGE);
         int result = write(mWritePipeFd, &wakeMessage, 1);
         ALOGE_IF(result < 0, "error sending wake message (%s)", strerror(errno));
     }
     return err;
 }

 int sensors_poll_context_t::setDelay(int handle, int64_t ns)
 {
     int index = handleToDriver(handle);
     if (index < 0) return index;
     return mSensor[index]->setDelay(handle, ns);
 }

 int sensors_poll_context_t::pollEvents(sensors_event_t *data, int count)
 {
     int nbEvents = 0;
     int n = 0;
     int nb, polltime = -1;

     do {
         for (int i = 0; count && i < numSensorDrivers; i++) {
             SensorBase* const sensor(mSensor[i]);
             if (mPollFds[i].revents & (POLLIN | POLLPRI)) {
                 nb = 0;
                 if (i == mpl) {
                     ((MPLSensor*) sensor)->buildMpuEvent();
                     mPollFds[i].revents = 0;
                     nb = ((MPLSensor*) sensor)->readEvents(data, count);
                     if (nb > 0) {
                         count -= nb;
                         nbEvents += nb;
                         data += nb;
                     }
                 } else if (i == compass) {
                     ((MPLSensor*) sensor)->buildCompassEvent();
                     mPollFds[i].revents = 0;
                     nb = ((MPLSensor*) sensor)->readEvents(data, count);
                     if (nb > 0) {
                         count -= nb;
                         nbEvents += nb;
                         data += nb;
                     }
                 } else if (i == dmpOrient) {
                     nb = ((MPLSensor*) sensor)->readDmpOrientEvents(data, count);
                     mPollFds[dmpOrient].revents= 0;
                     if (isDmpScreenAutoRotationEnabled() && nb > 0) {
                         count -= nb;
                         nbEvents += nb;
                         data += nb;
                     }
                 } else if (i == dmpSign) {
                     ALOGI("HAL: dmpSign interrupt");
                     nb = ((MPLSensor*) sensor)->readDmpSignificantMotionEvents(data, count);
                     mPollFds[i].revents = 0;
                     count -= nb;
                     nbEvents += nb;
                     data += nb;
                 } else if (i == dmpPed) {
                     ALOGI("HAL: dmpPed interrupt");
                     nb = ((MPLSensor*) sensor)->readDmpPedometerEvents(data, count, ID_P, SENSOR_TYPE_STEP_DETECTOR, 0);
                     mPollFds[i].revents = 0;
                     count -= nb;
                     nbEvents += nb;
                     data += nb;
                 } else {
                     // LightSensor and ProximitySensor
                     nb = sensor->readEvents(data, count);
                     if (nb < count) {
                         // no more data for this sensor
                         mPollFds[i].revents = 0;
                     }
                     count -= nb;
                     nbEvents += nb;
                     data += nb;
                 }
                 ALOGI_IF(0, "sensors_mpl:readEvents() - nb=%d, count=%d, nbEvents=%d, data->timestamp=%lld, data->data[0]=%f,",
                         nb, count, nbEvents, data->timestamp, data->data[0]);
             }
         }

         /* to see if any step counter events */
         if (((MPLSensor*) mSensor[mpl])->hasStepCountPendingEvents() == true) {
             nb = 0;
             nb = ((MPLSensor*) mSensor[mpl])->readDmpPedometerEvents(data, count, ID_SC, SENSOR_TYPE_STEP_COUNTER, 0);
             ALOGI_IF(0, "sensors_mpl:readStepCount() - nb=%d, count=%d, nbEvents=%d, data->timestamp=%lld, data->data[0]=%f,",
                     nb, count, nbEvents, data->timestamp, data->data[0]);
             if (nb > 0) {
                 count -= nb;
                 nbEvents += nb;
                 data += nb;
             }
         }
         if (count) {
             do {
                 n = poll(mPollFds, numFds, nbEvents ? 0 : polltime);
             } while (n < 0 && errno == EINTR);
             if (n < 0) {
                 ALOGE("poll() failed (%s)", strerror(errno));
                 return -errno;
             }
             if (mPollFds[wake].revents & (POLLIN | POLLPRI)) {
                 char msg;
                 int result = read(mPollFds[wake].fd, &msg, 1);
                 ALOGE_IF(result < 0, "error reading from wake pipe (%s)", strerror(errno));
                 ALOGE_IF(msg != WAKE_MESSAGE, "unknown message on wake queue (0x%02x)", int(msg));
                 mPollFds[wake].revents = 0;
             }
         }
     } while (n && count);

     return nbEvents;
 }

 int sensors_poll_context_t::batch(int handle, int flags, int64_t period_ns, int64_t timeout)
 {
     int index = handleToDriver(handle);
     if (index < 0) return index;
     return mSensor[index]->batch(handle, flags, period_ns, timeout);
 }

 int sensors_poll_context_t::flush(int handle)
 {
     int index = handleToDriver(handle);
     if (index < 0) return index;
     return mSensor[index]->flush(handle);
 }
 /******************************************************************************/

 static int poll__close(struct hw_device_t *dev)
 {
     sensors_poll_context_t *ctx = (sensors_poll_context_t *)dev;
     if (ctx) {
         delete ctx;
     }
     return 0;
 }

 static int poll__activate(struct sensors_poll_device_t *dev,
                           int handle, int enabled)
 {
     sensors_poll_context_t *ctx = (sensors_poll_context_t *)dev;
     return ctx->activate(handle, enabled);
 }

 static int poll__setDelay(struct sensors_poll_device_t *dev,
                           int handle, int64_t ns)
 {
     sensors_poll_context_t *ctx = (sensors_poll_context_t *)dev;
     int s= ctx->setDelay(handle, ns);
     return s;
 }

 static int poll__poll(struct sensors_poll_device_t *dev,
                       sensors_event_t* data, int count)
 {
     sensors_poll_context_t *ctx = (sensors_poll_context_t *)dev;
     return ctx->pollEvents(data, count);
 }

 static int poll__batch(struct sensors_poll_device_1 *dev,
                       int handle, int flags, int64_t period_ns, int64_t timeout)
 {
     sensors_poll_context_t *ctx = (sensors_poll_context_t *)dev;
     return ctx->batch(handle, flags, period_ns, timeout);
 }

 static int poll__flush(struct sensors_poll_device_1 *dev,
                       int handle)
 {
     sensors_poll_context_t *ctx = (sensors_poll_context_t *)dev;
     return ctx->flush(handle);
 }
 /******************************************************************************/

 /** Open a new instance of a sensor device using name */
 static int open_sensors(const struct hw_module_t* module, const char* id,
                         struct hw_device_t** device)
 {
     int status = -EINVAL;
     sensors_poll_context_t *dev = new sensors_poll_context_t();

     if (!dev->isValid()) {
         ALOGE("Failed to open the sensors");
         return status;
     }

     memset(&dev->device, 0, sizeof(sensors_poll_device_1));

     dev->device.common.tag = HARDWARE_DEVICE_TAG;
     dev->device.common.version  = SENSORS_DEVICE_API_VERSION_1_0;
     dev->device.common.module   = const_cast<hw_module_t*>(module);
     dev->device.common.close    = poll__close;
     dev->device.activate        = poll__activate;
     dev->device.setDelay        = poll__setDelay;
     dev->device.poll            = poll__poll;

     /* Batch processing */
     dev->device.batch           = poll__batch;
     dev->device.flush           = poll__flush;

     *device = &dev->device.common;
     status = 0;

     return status;
 }
	/*
	* Copyright 2013 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 <hardware/sensors.h>
	#include <fcntl.h>
	#include <errno.h>
	#include <dirent.h>
	#include <math.h>
	#include <poll.h>
	#include <pthread.h>
	#include <stdlib.h>

	#include <linux/input.h>

	#include <utils/Atomic.h>
	#include <utils/Log.h>

	#include "sensors.h"
	#include "MPLSensor.h"
	#include "LightSensor.h"
	#include "ProximitySensor.h"

	/*****************************************************************************/
	/* The SENSORS Module */

	#ifdef ENABLE_DMP_SCREEN_AUTO_ROTATION
	#define GLOBAL_SENSORS (MPLSensor::NumSensors + 1)
	#else
	#define GLOBAL_SENSORS MPLSensor::NumSensors
	#endif

	#define LOCAL_SENSORS (2)

	#define SENSORS_LIGHT_HANDLE (ID_L)
	#define SENSORS_PROXIMITY_HANDLE (ID_PX)

	static struct sensor_t sSensorList[GLOBAL_SENSORS + LOCAL_SENSORS] = {
	{
	.name = "Light Sensor",
	.vendor = "Avago Technologies",
	.version = 1,
	.handle = SENSORS_LIGHT_HANDLE,
	.type = SENSOR_TYPE_LIGHT,
	.maxRange = 30000.0f,
	.resolution = 1.0f,
	.power = 0.5f,
	.minDelay = 100000,
	.reserved = {}
	},
	{
	.name = "Proximity Sensor",
	.vendor = "Avago Technologies",
	.version = 1,
	.handle = SENSORS_PROXIMITY_HANDLE,
	.type = SENSOR_TYPE_PROXIMITY,
	.maxRange = 5.0f,
	.resolution = 1.0f,
	.power = 0.5f,
	.minDelay = 100000,
	.reserved = {}
	},
	};
	static int sensors = (sizeof(sSensorList) / sizeof(sensor_t));

	static int open_sensors(const struct hw_module_t* module, const char* id,
	struct hw_device_t** device);

	static int sensors__get_sensors_list(struct sensors_module_t* module,
	struct sensor_t const** list)
	{
	*list = sSensorList;
	return sensors;
	}

	static struct hw_module_methods_t sensors_module_methods = {
	open: open_sensors
	};

	struct sensors_module_t HAL_MODULE_INFO_SYM = {
	common: {
	tag: HARDWARE_MODULE_TAG,
	version_major: 1,
	version_minor: 0,
	id: SENSORS_HARDWARE_MODULE_ID,
	name: "LGE Sensor module",
	author: "LG Electronics Inc.",
	methods: &sensors_module_methods,
	dso: NULL,
	reserved: {0}
	},
	get_sensors_list: sensors__get_sensors_list,
	};

	struct sensors_poll_context_t {
	sensors_poll_device_1_t device; // must be first

	sensors_poll_context_t();
	~sensors_poll_context_t();
	int activate(int handle, int enabled);
	int setDelay(int handle, int64_t ns);
	int pollEvents(sensors_event_t* data, int count);
	int batch(int handle, int flags, int64_t period_ns, int64_t timeout);

	// return true if the constructor is completed
	bool isValid() { return mInitialized; };
	int flush(int handle);

	private:
	enum {
	mpl = 0,
	compass,
	dmpOrient,
	dmpSign,
	dmpPed,
	light,
	proximity,
	numSensorDrivers, // wake pipe goes here
	numFds,
	};

	static const size_t wake = numFds - 1;
	static const char WAKE_MESSAGE = 'W';
	struct pollfd mPollFds[numFds];
	int mWritePipeFd;
	SensorBase *mSensor[numSensorDrivers];
	CompassSensor *mCompassSensor;
	// return true if the constructor is completed
	bool mInitialized;

	int handleToDriver(int handle) const {
	switch (handle) {
	case ID_GY:
	case ID_RG:
	case ID_A:
	case ID_M:
	case ID_RM:
	case ID_PS:
	case ID_O:
	case ID_RV:
	case ID_GRV:
	case ID_LA:
	case ID_GR:
	case ID_SM:
	case ID_P:
	case ID_SC:
	case ID_GMRV:
	case ID_SO:
	return mpl;
	case ID_L:
	return light;
	case ID_PX:
	return proximity;
	}
	return -EINVAL;
	}
	};

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

	sensors_poll_context_t::sensors_poll_context_t() {
	/* TODO: Handle external pressure sensor */
	mCompassSensor = new CompassSensor();
	MPLSensor *mplSensor = new MPLSensor(mCompassSensor);
	mInitialized = false;
	// Must clean this up early or else the destructor will make a mess.
	memset(mSensor, 0, sizeof(mSensor));

	// setup the callback object for handing mpl callbacks
	setCallbackObject(mplSensor);

	// populate the sensor list
	sensors = LOCAL_SENSORS +
	mplSensor->populateSensorList(sSensorList + LOCAL_SENSORS,
	sizeof(sSensorList[0]) * (ARRAY_SIZE(sSensorList) - LOCAL_SENSORS));

	mSensor[mpl] = mplSensor;
	mPollFds[mpl].fd = mSensor[mpl]->getFd();
	mPollFds[mpl].events = POLLIN;
	mPollFds[mpl].revents = 0;

	mSensor[compass] = mplSensor;
	mPollFds[compass].fd = mCompassSensor->getFd();
	mPollFds[compass].events = POLLIN;
	mPollFds[compass].revents = 0;

	mSensor[dmpOrient] = mplSensor;
	mPollFds[dmpOrient].fd = ((MPLSensor*) mSensor[dmpOrient])->getDmpOrientFd();
	mPollFds[dmpOrient].events = POLLPRI;
	mPollFds[dmpOrient].revents = 0;

	mSensor[dmpSign] = mplSensor;
	mPollFds[dmpSign].fd = ((MPLSensor*) mSensor[dmpSign])->getDmpSignificantMotionFd();
	mPollFds[dmpSign].events = POLLPRI;
	mPollFds[dmpSign].revents = 0;

	mSensor[dmpPed] = mplSensor;
	mPollFds[dmpPed].fd = ((MPLSensor*) mSensor[dmpPed])->getDmpPedometerFd();
	mPollFds[dmpPed].events = POLLPRI;
	mPollFds[dmpPed].revents = 0;

	mSensor[light] = new LightSensor();
	mPollFds[light].fd = mSensor[light]->getFd();
	mPollFds[light].events = POLLIN;
	mPollFds[light].revents = 0;

	mSensor[proximity] = new ProximitySensor();
	mPollFds[proximity].fd = mSensor[proximity]->getFd();
	mPollFds[proximity].events = POLLIN;
	mPollFds[proximity].revents = 0;

	if (mPollFds[light].fd < 0 \|\| mPollFds[proximity].fd < 0) {
	delete mCompassSensor;
	return;
	}

	/* Timer based sensor initialization */
	int wakeFds[2];
	int result = pipe(wakeFds);
	ALOGE_IF(result < 0, "error creating wake pipe (%s)", strerror(errno));
	fcntl(wakeFds[0], F_SETFL, O_NONBLOCK);
	fcntl(wakeFds[1], F_SETFL, O_NONBLOCK);
	mWritePipeFd = wakeFds[1];

	mPollFds[wake].fd = wakeFds[0];
	mPollFds[wake].events = POLLIN;
	mPollFds[wake].revents = 0;
	mInitialized = true;
	}

	sensors_poll_context_t::~sensors_poll_context_t() {
	for (int i=0 ; i<numSensorDrivers ; i++) {
	delete mSensor[i];
	}
	delete mCompassSensor;
	close(mPollFds[wake].fd);
	close(mWritePipeFd);
	mInitialized = false;
	}

	int sensors_poll_context_t::activate(int handle, int enabled) {
	if (!mInitialized) return -EINVAL;
	int index = handleToDriver(handle);
	if (index < 0) return index;
	int err = mSensor[index]->enable(handle, enabled);
	if (!err) {
	const char wakeMessage(WAKE_MESSAGE);
	int result = write(mWritePipeFd, &wakeMessage, 1);
	ALOGE_IF(result < 0, "error sending wake message (%s)", strerror(errno));
	}
	return err;
	}

	int sensors_poll_context_t::setDelay(int handle, int64_t ns)
	{
	int index = handleToDriver(handle);
	if (index < 0) return index;
	return mSensor[index]->setDelay(handle, ns);
	}

	int sensors_poll_context_t::pollEvents(sensors_event_t *data, int count)
	{
	int nbEvents = 0;
	int n = 0;
	int nb, polltime = -1;

	do {
	for (int i = 0; count && i < numSensorDrivers; i++) {
	SensorBase* const sensor(mSensor[i]);
	if (mPollFds[i].revents & (POLLIN \| POLLPRI)) {
	nb = 0;
	if (i == mpl) {
	((MPLSensor*) sensor)->buildMpuEvent();
	mPollFds[i].revents = 0;
	nb = ((MPLSensor*) sensor)->readEvents(data, count);
	if (nb > 0) {
	count -= nb;
	nbEvents += nb;
	data += nb;
	}
	} else if (i == compass) {
	((MPLSensor*) sensor)->buildCompassEvent();
	mPollFds[i].revents = 0;
	nb = ((MPLSensor*) sensor)->readEvents(data, count);
	if (nb > 0) {
	count -= nb;
	nbEvents += nb;
	data += nb;
	}
	} else if (i == dmpOrient) {
	nb = ((MPLSensor*) sensor)->readDmpOrientEvents(data, count);
	mPollFds[dmpOrient].revents= 0;
	if (isDmpScreenAutoRotationEnabled() && nb > 0) {
	count -= nb;
	nbEvents += nb;
	data += nb;
	}
	} else if (i == dmpSign) {
	ALOGI("HAL: dmpSign interrupt");
	nb = ((MPLSensor*) sensor)->readDmpSignificantMotionEvents(data, count);
	mPollFds[i].revents = 0;
	count -= nb;
	nbEvents += nb;
	data += nb;
	} else if (i == dmpPed) {
	ALOGI("HAL: dmpPed interrupt");
	nb = ((MPLSensor*) sensor)->readDmpPedometerEvents(data, count, ID_P, SENSOR_TYPE_STEP_DETECTOR, 0);
	mPollFds[i].revents = 0;
	count -= nb;
	nbEvents += nb;
	data += nb;
	} else {
	// LightSensor and ProximitySensor
	nb = sensor->readEvents(data, count);
	if (nb < count) {
	// no more data for this sensor
	mPollFds[i].revents = 0;
	}
	count -= nb;
	nbEvents += nb;
	data += nb;
	}
	ALOGI_IF(0, "sensors_mpl:readEvents() - nb=%d, count=%d, nbEvents=%d, data->timestamp=%lld, data->data[0]=%f,",
	nb, count, nbEvents, data->timestamp, data->data[0]);
	}
	}

	/* to see if any step counter events */
	if (((MPLSensor*) mSensor[mpl])->hasStepCountPendingEvents() == true) {
	nb = 0;
	nb = ((MPLSensor*) mSensor[mpl])->readDmpPedometerEvents(data, count, ID_SC, SENSOR_TYPE_STEP_COUNTER, 0);
	ALOGI_IF(0, "sensors_mpl:readStepCount() - nb=%d, count=%d, nbEvents=%d, data->timestamp=%lld, data->data[0]=%f,",
	nb, count, nbEvents, data->timestamp, data->data[0]);
	if (nb > 0) {
	count -= nb;
	nbEvents += nb;
	data += nb;
	}
	}
	if (count) {
	do {
	n = poll(mPollFds, numFds, nbEvents ? 0 : polltime);
	} while (n < 0 && errno == EINTR);
	if (n < 0) {
	ALOGE("poll() failed (%s)", strerror(errno));
	return -errno;
	}
	if (mPollFds[wake].revents & (POLLIN \| POLLPRI)) {
	char msg;
	int result = read(mPollFds[wake].fd, &msg, 1);
	ALOGE_IF(result < 0, "error reading from wake pipe (%s)", strerror(errno));
	ALOGE_IF(msg != WAKE_MESSAGE, "unknown message on wake queue (0x%02x)", int(msg));
	mPollFds[wake].revents = 0;
	}
	}
	} while (n && count);

	return nbEvents;
	}

	int sensors_poll_context_t::batch(int handle, int flags, int64_t period_ns, int64_t timeout)
	{
	int index = handleToDriver(handle);
	if (index < 0) return index;
	return mSensor[index]->batch(handle, flags, period_ns, timeout);
	}

	int sensors_poll_context_t::flush(int handle)
	{
	int index = handleToDriver(handle);
	if (index < 0) return index;
	return mSensor[index]->flush(handle);
	}
	/******************************************************************************/

	static int poll__close(struct hw_device_t *dev)
	{
	sensors_poll_context_t ctx = (sensors_poll_context_t )dev;
	if (ctx) {
	delete ctx;
	}
	return 0;
	}

	static int poll__activate(struct sensors_poll_device_t *dev,
	int handle, int enabled)
	{
	sensors_poll_context_t ctx = (sensors_poll_context_t )dev;
	return ctx->activate(handle, enabled);
	}

	static int poll__setDelay(struct sensors_poll_device_t *dev,
	int handle, int64_t ns)
	{
	sensors_poll_context_t ctx = (sensors_poll_context_t )dev;
	int s= ctx->setDelay(handle, ns);
	return s;
	}

	static int poll__poll(struct sensors_poll_device_t *dev,
	sensors_event_t* data, int count)
	{
	sensors_poll_context_t ctx = (sensors_poll_context_t )dev;
	return ctx->pollEvents(data, count);
	}

	static int poll__batch(struct sensors_poll_device_1 *dev,
	int handle, int flags, int64_t period_ns, int64_t timeout)
	{
	sensors_poll_context_t ctx = (sensors_poll_context_t )dev;
	return ctx->batch(handle, flags, period_ns, timeout);
	}

	static int poll__flush(struct sensors_poll_device_1 *dev,
	int handle)
	{
	sensors_poll_context_t ctx = (sensors_poll_context_t )dev;
	return ctx->flush(handle);
	}
	/******************************************************************************/

	/** Open a new instance of a sensor device using name */
	static int open_sensors(const struct hw_module_t* module, const char* id,
	struct hw_device_t** device)
	{
	int status = -EINVAL;
	sensors_poll_context_t *dev = new sensors_poll_context_t();

	if (!dev->isValid()) {
	ALOGE("Failed to open the sensors");
	return status;
	}

	memset(&dev->device, 0, sizeof(sensors_poll_device_1));

	dev->device.common.tag = HARDWARE_DEVICE_TAG;
	dev->device.common.version = SENSORS_DEVICE_API_VERSION_1_0;
	dev->device.common.module = const_cast<hw_module_t*>(module);
	dev->device.common.close = poll__close;
	dev->device.activate = poll__activate;
	dev->device.setDelay = poll__setDelay;
	dev->device.poll = poll__poll;

	/* Batch processing */
	dev->device.batch = poll__batch;
	dev->device.flush = poll__flush;

	*device = &dev->device.common;
	status = 0;

	return status;
	}