libsensors/sensors.cpp - device/samsung/tuna - Git at Google

 /*
  * Copyright (C) 2011 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.
  */

 #define LOG_NDEBUG 0
 #define LOG_TAG "Sensors"
 //#define FUNC_LOG ALOGV("%s", __PRETTY_FUNCTION__)
 #define FUNC_LOG

 #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"
 #include "PressureSensor.h"


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

 #define DELAY_OUT_TIME 0x7FFFFFFF

 #define LIGHT_SENSOR_POLLTIME    2000000000

 #define SENSORS_ROTATION_VECTOR  (1<<ID_RV)
 #define SENSORS_LINEAR_ACCEL     (1<<ID_LA)
 #define SENSORS_GRAVITY          (1<<ID_GR)
 #define SENSORS_GYROSCOPE        (1<<ID_GY)
 #define SENSORS_ACCELERATION     (1<<ID_A)
 #define SENSORS_MAGNETIC_FIELD   (1<<ID_M)
 #define SENSORS_ORIENTATION      (1<<ID_O)
 #define SENSORS_LIGHT            (1<<ID_L)
 #define SENSORS_PROXIMITY        (1<<ID_P)
 #define SENSORS_PRESSURE         (1<<ID_PR)

 #define SENSORS_ROTATION_VECTOR_HANDLE  (ID_RV)
 #define SENSORS_LINEAR_ACCEL_HANDLE     (ID_LA)
 #define SENSORS_GRAVITY_HANDLE          (ID_GR)
 #define SENSORS_GYROSCOPE_HANDLE        (ID_GY)
 #define SENSORS_ACCELERATION_HANDLE     (ID_A)
 #define SENSORS_MAGNETIC_FIELD_HANDLE   (ID_M)
 #define SENSORS_ORIENTATION_HANDLE      (ID_O)
 #define SENSORS_LIGHT_HANDLE            (ID_L)
 #define SENSORS_PROXIMITY_HANDLE        (ID_P)
 #define SENSORS_PRESSURE_HANDLE         (ID_PR)
 #define AKM_FTRACE 0
 #define AKM_DEBUG 0
 #define AKM_DATA 0

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

 /* The SENSORS Module */
 #define LOCAL_SENSORS (3)
 static struct sensor_t sSensorList[LOCAL_SENSORS + MPLSensor::numSensors] = {
       { "GP2A Light sensor",
           "Sharp",
           1, SENSORS_LIGHT_HANDLE,
           SENSOR_TYPE_LIGHT, powf(10, 125.0f/ 24.0f) * 4, 1.0f, 0.75f, 0, { } },
       { "GP2A Proximity sensor",
           "Sharp",
           1, SENSORS_PROXIMITY_HANDLE,
           SENSOR_TYPE_PROXIMITY, 5.0f, 5.0f, 0.75f, 0, { } },
       { "BMP180 Pressure sensor",
           "Bosch",
           1, SENSORS_PRESSURE_HANDLE,
           SENSOR_TYPE_PRESSURE, 1100.0f, 0.01f, 0.67f, 20000, { } },
 };
 static int numSensors = LOCAL_SENSORS;

 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 numSensors;
 }

 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: "Samsung Sensor module",
                 author: "Samsung Electronic Company",
                 methods: &sensors_module_methods,
                 dso: 0,
                 reserved: {},
         },
         get_sensors_list: sensors__get_sensors_list,
 };

 struct sensors_poll_context_t {
     struct sensors_poll_device_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);

 private:
     enum {
         mpl               = 0,  //all mpl entries must be consecutive and in this order
         mpl_accel,
         mpl_timer,
         light,
         proximity,
         pressure,
         numSensorDrivers,       // wake pipe goes here
         mpl_power,              //special handle for MPL pm interaction
         numFds,
     };

     static const size_t wake = numFds - 2;
     static const char WAKE_MESSAGE = 'W';
     struct pollfd mPollFds[numFds];
     int mWritePipeFd;
     SensorBase* mSensors[numSensorDrivers];

     int handleToDriver(int handle) const {
         switch (handle) {
             case ID_RV:
             case ID_LA:
             case ID_GR:
             case ID_GY:
             case ID_A:
             case ID_M:
             case ID_O:
                 return mpl;
             case ID_L:
                 return light;
             case ID_P:
                 return proximity;
             case ID_PR:
                 return pressure;
         }
         return -EINVAL;
     }
 };

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

 sensors_poll_context_t::sensors_poll_context_t()
 {
     FUNC_LOG;
     MPLSensor* p_mplsen = new MPLSensor();
     setCallbackObject(p_mplsen); //setup the callback object for handing mpl callbacks
     numSensors =
         LOCAL_SENSORS +
         p_mplsen->populateSensorList(sSensorList + LOCAL_SENSORS,
                                      sizeof(sSensorList[0]) * (ARRAY_SIZE(sSensorList) - LOCAL_SENSORS));

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

     mSensors[mpl_accel] = mSensors[mpl];
     mPollFds[mpl_accel].fd = ((MPLSensor*)mSensors[mpl])->getAccelFd();
     mPollFds[mpl_accel].events = POLLIN;
     mPollFds[mpl_accel].revents = 0;

     mSensors[mpl_timer] = mSensors[mpl];
     mPollFds[mpl_timer].fd = ((MPLSensor*)mSensors[mpl])->getTimerFd();
     mPollFds[mpl_timer].events = POLLIN;
     mPollFds[mpl_timer].revents = 0;

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

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

     mSensors[pressure] = new PressureSensor();
     mPollFds[pressure].fd = mSensors[pressure]->getFd();
     mPollFds[pressure].events = POLLIN;
     mPollFds[pressure].revents = 0;

     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;

     //setup MPL pm interaction handle
     mPollFds[mpl_power].fd = ((MPLSensor*)mSensors[mpl])->getPowerFd();
     mPollFds[mpl_power].events = POLLIN;
     mPollFds[mpl_power].revents = 0;
 }

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

 int sensors_poll_context_t::activate(int handle, int enabled)
 {
     FUNC_LOG;
     int index = handleToDriver(handle);
     if (index < 0) return index;
     int err =  mSensors[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)
 {
     FUNC_LOG;
     int index = handleToDriver(handle);
     if (index < 0) return index;
     return mSensors[index]->setDelay(handle, ns);
 }

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

     do {
         // see if we have some leftover from the last poll()
         for (int i=0 ; count && i<numSensorDrivers ; i++) {
             SensorBase* const sensor(mSensors[i]);
             if ((mPollFds[i].revents & POLLIN) || (sensor->hasPendingEvents())) {
                 int nb = sensor->readEvents(data, count);
                 if (nb < count) {
                     // no more data for this sensor
                     mPollFds[i].revents = 0;
                 }
                 count -= nb;
                 nbEvents += nb;
                 data += nb;

                 //special handling for the mpl, which has multiple handles
                 if(i==mpl) {
                     i+=2; //skip accel and timer
                     mPollFds[mpl_accel].revents = 0;
                     mPollFds[mpl_timer].revents = 0;
                 }
                 if(i==mpl_accel) {
                     i+=1; //skip timer
                     mPollFds[mpl_timer].revents = 0;
                 }
             }
         }

         if (count) {
             // we still have some room, so try to see if we can get
             // some events immediately or just wait if we don't have
             // anything to return
             int i;

             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) {
                 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;
             }
             if(mPollFds[mpl_power].revents & POLLIN) {
                 ((MPLSensor*)mSensors[mpl])->handlePowerEvent();
                 mPollFds[mpl_power].revents = 0;
             }
         }
         // if we have events and space, go read them
     } while (n && count);

     return nbEvents;
 }

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

 static int poll__close(struct hw_device_t *dev)
 {
     FUNC_LOG;
     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)
 {
     FUNC_LOG;
     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)
 {
     FUNC_LOG;
     sensors_poll_context_t *ctx = (sensors_poll_context_t *)dev;
     return ctx->setDelay(handle, ns);
 }

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

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

 /** 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)
 {
     FUNC_LOG;
     int status = -EINVAL;
     sensors_poll_context_t *dev = new sensors_poll_context_t();

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

     dev->device.common.tag = HARDWARE_DEVICE_TAG;
     dev->device.common.version  = 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;

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

     return status;
 }
	/*
	* Copyright (C) 2011 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.
	*/

	#define LOG_NDEBUG 0
	#define LOG_TAG "Sensors"
	//#define FUNC_LOG ALOGV("%s", __PRETTY_FUNCTION__)
	#define FUNC_LOG

	#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"
	#include "PressureSensor.h"


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

	#define DELAY_OUT_TIME 0x7FFFFFFF

	#define LIGHT_SENSOR_POLLTIME 2000000000

	#define SENSORS_ROTATION_VECTOR (1<<ID_RV)
	#define SENSORS_LINEAR_ACCEL (1<<ID_LA)
	#define SENSORS_GRAVITY (1<<ID_GR)
	#define SENSORS_GYROSCOPE (1<<ID_GY)
	#define SENSORS_ACCELERATION (1<<ID_A)
	#define SENSORS_MAGNETIC_FIELD (1<<ID_M)
	#define SENSORS_ORIENTATION (1<<ID_O)
	#define SENSORS_LIGHT (1<<ID_L)
	#define SENSORS_PROXIMITY (1<<ID_P)
	#define SENSORS_PRESSURE (1<<ID_PR)

	#define SENSORS_ROTATION_VECTOR_HANDLE (ID_RV)
	#define SENSORS_LINEAR_ACCEL_HANDLE (ID_LA)
	#define SENSORS_GRAVITY_HANDLE (ID_GR)
	#define SENSORS_GYROSCOPE_HANDLE (ID_GY)
	#define SENSORS_ACCELERATION_HANDLE (ID_A)
	#define SENSORS_MAGNETIC_FIELD_HANDLE (ID_M)
	#define SENSORS_ORIENTATION_HANDLE (ID_O)
	#define SENSORS_LIGHT_HANDLE (ID_L)
	#define SENSORS_PROXIMITY_HANDLE (ID_P)
	#define SENSORS_PRESSURE_HANDLE (ID_PR)
	#define AKM_FTRACE 0
	#define AKM_DEBUG 0
	#define AKM_DATA 0

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

	/* The SENSORS Module */
	#define LOCAL_SENSORS (3)
	static struct sensor_t sSensorList[LOCAL_SENSORS + MPLSensor::numSensors] = {
	{ "GP2A Light sensor",
	"Sharp",
	1, SENSORS_LIGHT_HANDLE,
	SENSOR_TYPE_LIGHT, powf(10, 125.0f/ 24.0f) * 4, 1.0f, 0.75f, 0, { } },
	{ "GP2A Proximity sensor",
	"Sharp",
	1, SENSORS_PROXIMITY_HANDLE,
	SENSOR_TYPE_PROXIMITY, 5.0f, 5.0f, 0.75f, 0, { } },
	{ "BMP180 Pressure sensor",
	"Bosch",
	1, SENSORS_PRESSURE_HANDLE,
	SENSOR_TYPE_PRESSURE, 1100.0f, 0.01f, 0.67f, 20000, { } },
	};
	static int numSensors = LOCAL_SENSORS;

	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 numSensors;
	}

	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: "Samsung Sensor module",
	author: "Samsung Electronic Company",
	methods: &sensors_module_methods,
	dso: 0,
	reserved: {},
	},
	get_sensors_list: sensors__get_sensors_list,
	};

	struct sensors_poll_context_t {
	struct sensors_poll_device_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);

	private:
	enum {
	mpl = 0, //all mpl entries must be consecutive and in this order
	mpl_accel,
	mpl_timer,
	light,
	proximity,
	pressure,
	numSensorDrivers, // wake pipe goes here
	mpl_power, //special handle for MPL pm interaction
	numFds,
	};

	static const size_t wake = numFds - 2;
	static const char WAKE_MESSAGE = 'W';
	struct pollfd mPollFds[numFds];
	int mWritePipeFd;
	SensorBase* mSensors[numSensorDrivers];

	int handleToDriver(int handle) const {
	switch (handle) {
	case ID_RV:
	case ID_LA:
	case ID_GR:
	case ID_GY:
	case ID_A:
	case ID_M:
	case ID_O:
	return mpl;
	case ID_L:
	return light;
	case ID_P:
	return proximity;
	case ID_PR:
	return pressure;
	}
	return -EINVAL;
	}
	};

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

	sensors_poll_context_t::sensors_poll_context_t()
	{
	FUNC_LOG;
	MPLSensor* p_mplsen = new MPLSensor();
	setCallbackObject(p_mplsen); //setup the callback object for handing mpl callbacks
	numSensors =
	LOCAL_SENSORS +
	p_mplsen->populateSensorList(sSensorList + LOCAL_SENSORS,
	sizeof(sSensorList[0]) * (ARRAY_SIZE(sSensorList) - LOCAL_SENSORS));

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

	mSensors[mpl_accel] = mSensors[mpl];
	mPollFds[mpl_accel].fd = ((MPLSensor*)mSensors[mpl])->getAccelFd();
	mPollFds[mpl_accel].events = POLLIN;
	mPollFds[mpl_accel].revents = 0;

	mSensors[mpl_timer] = mSensors[mpl];
	mPollFds[mpl_timer].fd = ((MPLSensor*)mSensors[mpl])->getTimerFd();
	mPollFds[mpl_timer].events = POLLIN;
	mPollFds[mpl_timer].revents = 0;

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

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

	mSensors[pressure] = new PressureSensor();
	mPollFds[pressure].fd = mSensors[pressure]->getFd();
	mPollFds[pressure].events = POLLIN;
	mPollFds[pressure].revents = 0;

	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;

	//setup MPL pm interaction handle
	mPollFds[mpl_power].fd = ((MPLSensor*)mSensors[mpl])->getPowerFd();
	mPollFds[mpl_power].events = POLLIN;
	mPollFds[mpl_power].revents = 0;
	}

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

	int sensors_poll_context_t::activate(int handle, int enabled)
	{
	FUNC_LOG;
	int index = handleToDriver(handle);
	if (index < 0) return index;
	int err = mSensors[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)
	{
	FUNC_LOG;
	int index = handleToDriver(handle);
	if (index < 0) return index;
	return mSensors[index]->setDelay(handle, ns);
	}

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

	do {
	// see if we have some leftover from the last poll()
	for (int i=0 ; count && i<numSensorDrivers ; i++) {
	SensorBase* const sensor(mSensors[i]);
	if ((mPollFds[i].revents & POLLIN) \|\| (sensor->hasPendingEvents())) {
	int nb = sensor->readEvents(data, count);
	if (nb < count) {
	// no more data for this sensor
	mPollFds[i].revents = 0;
	}
	count -= nb;
	nbEvents += nb;
	data += nb;

	//special handling for the mpl, which has multiple handles
	if(i==mpl) {
	i+=2; //skip accel and timer
	mPollFds[mpl_accel].revents = 0;
	mPollFds[mpl_timer].revents = 0;
	}
	if(i==mpl_accel) {
	i+=1; //skip timer
	mPollFds[mpl_timer].revents = 0;
	}
	}
	}

	if (count) {
	// we still have some room, so try to see if we can get
	// some events immediately or just wait if we don't have
	// anything to return
	int i;

	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) {
	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;
	}
	if(mPollFds[mpl_power].revents & POLLIN) {
	((MPLSensor*)mSensors[mpl])->handlePowerEvent();
	mPollFds[mpl_power].revents = 0;
	}
	}
	// if we have events and space, go read them
	} while (n && count);

	return nbEvents;
	}

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

	static int poll__close(struct hw_device_t *dev)
	{
	FUNC_LOG;
	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)
	{
	FUNC_LOG;
	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)
	{
	FUNC_LOG;
	sensors_poll_context_t ctx = (sensors_poll_context_t )dev;
	return ctx->setDelay(handle, ns);
	}

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

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

	/** 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)
	{
	FUNC_LOG;
	int status = -EINVAL;
	sensors_poll_context_t *dev = new sensors_poll_context_t();

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

	dev->device.common.tag = HARDWARE_DEVICE_TAG;
	dev->device.common.version = 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;

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

	return status;
	}