als/sensors.cpp - platform/hardware/intel/sensors - Git at Google

 /*
  * Copyright (C) 2015 Intel Corp
  *
  * 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 <string.h>
 #include <linux/input.h>
 #include <utils/Atomic.h>
 #include <utils/Log.h>

 #include "sensors.h"
 #include "AlsSensor.h"

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

 #define DELAY_OUT_TIME          0x7FFFFFFF
 #define LIGHT_SENSOR_POLLTIME   2000000000

 #define SENSORS_LIGHT_HANDLE    (ID_L)
 #define SENSORS_TILT_HANDLE     (ID_T)
 /*****************************************************************************/

 /* The SENSORS Module */
 static struct sensor_t sSensorList[] = {
         { "TSL2584 Ambient light sensor",
           "ams, ltd.",
           1, SENSORS_LIGHT_HANDLE,
           SENSOR_TYPE_LIGHT, 65535.0f, 1.0f, 0.015f,
           0, 0, 0, SENSOR_STRING_TYPE_LIGHT, NULL,
           5000000, SENSOR_FLAG_ON_CHANGE_MODE, { } },
 };

 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 ARRAY_SIZE(sSensorList);
 }

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

 struct sensors_poll_context_t {
 #ifdef HAL_VERSION_GE_1_0
     struct sensors_poll_device_1 device; // must be first
 #else
     struct sensors_poll_device_t device; // must be first
 #endif
     sensors_poll_context_t();
     ~sensors_poll_context_t();
     int activate(int handle, int enabled);
     int setDelay(int handle, int64_t ns);
 #ifdef HAL_VERSION_GT_1_0
     int batch(int handle, int flags, int64_t period_ns, int64_t timeout);
     int flush(int handle);
 #endif
     int pollEvents(sensors_event_t* data, int count);
     bool getInitialized() { return mInitialized; };

 private:
     bool mInitialized;

     enum {
         light = 0,
         numSensorDrivers,       /* wake pipe goes here */
         flushPipe,              /* flush pipe goes here */
         numFds,
     };

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

     int handleToDriver(int handle) const {
         switch (handle) {
             case ID_L:
                 return light;
         }
         return -EINVAL;
     }
 };

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

 sensors_poll_context_t::sensors_poll_context_t()
 {
     FUNC_LOG;
     mInitialized = false;
     /* Must clean this up early or else the destructor will make a mess */
     memset(mSensors, 0, sizeof(mSensors));

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

     int wakeFds[2];
     int result = pipe(wakeFds);
     ALOGE_IF(result<0, "error creating wake pipe (%s)", strerror(errno));
     result = fcntl(wakeFds[0], F_SETFL, O_NONBLOCK);
     ALOGE_IF(result<0, "error setting wakeFds[0] access mode (%s)", strerror(errno));
     result = fcntl(wakeFds[1], F_SETFL, O_NONBLOCK);
     ALOGE_IF(result<0, "error setting wakeFds[1] access mode (%s)", strerror(errno));
     mWritePipeFd = wakeFds[1];

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

     int flushFds[2];
     result = pipe(flushFds);
     ALOGE_IF(result<0, "error creating flush pipe (%s)", strerror(errno));
     result = fcntl(flushFds[0], F_SETFL, O_NONBLOCK);
     ALOGE_IF(result<0, "error setting flushFds[0] access mode (%s)", strerror(errno));
     result = fcntl(flushFds[1], F_SETFL, O_NONBLOCK);
     ALOGE_IF(result<0, "error setting flushFds[1] access mode (%s)", strerror(errno));
     mFlushWritePipeFd = flushFds[1];

     mPollFds[flushPipe].fd = flushFds[0];
     mPollFds[flushPipe].events = POLLIN;
     mPollFds[flushPipe].revents = 0;
     mInitialized = true;
 }

 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);
     close(mPollFds[flushPipe].fd);
     close(mFlushWritePipeFd);
     mInitialized = false;
 }

 int sensors_poll_context_t::activate(int handle, int enabled)
 {
     FUNC_LOG;
     if (!mInitialized) return -EINVAL;
     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);
 }

 #ifdef HAL_VERSION_GT_1_0
 int sensors_poll_context_t::batch(int handle, int flags, int64_t period_ns, int64_t timeout)
 {
     FUNC_LOG;
     int index = handleToDriver(handle);
     if (index < 0) return index;
     return mSensors[index]->batch(handle, flags, period_ns, timeout);
 }

 int sensors_poll_context_t::flush(int handle)
 {
     FUNC_LOG;
     int result;
     sensors_event_t flush_event_data;

     int index = handleToDriver(handle);
     if (index < 0) return index;

     result = mSensors[index]->isActivated(handle);
     if (!result)
         return -EINVAL;

     flush_event_data.sensor = 0;
     flush_event_data.timestamp = 0;
     flush_event_data.meta_data.sensor = handle;
     flush_event_data.meta_data.what = META_DATA_FLUSH_COMPLETE;
     flush_event_data.type = SENSOR_TYPE_META_DATA;
     flush_event_data.version = META_DATA_VERSION;

     result = write(mFlushWritePipeFd, &flush_event_data, sizeof(sensors_event_t));
     ALOGE_IF(result<0, "error sending flush event data (%s)", strerror(errno));

     return (result >= 0 ? 0 : result);
 }
 #endif

 int sensors_poll_context_t::pollEvents(sensors_event_t* data, int count)
 {
     FUNC_LOG;
     int nbEvents = 0;
     int n = 0;
     do {
         for (int i=0 ; count && i<numSensorDrivers; i++) {
             SensorBase* const sensor(mSensors[i]);
             if ((mPollFds[i].revents & POLLIN) || (sensor->hasPendingEvents())) {
                 int nb;
                 nb = sensor->readEvents(data, count);
                 if (nb < count) {
                     mPollFds[i].revents = 0;
                 }
                 count -= nb;
                 nbEvents += nb;
                 data += nb;
             }
         }

         /* flush event data */
         if (count) {
             if (mPollFds[flushPipe].revents & POLLIN) {
                 int nb = read(mPollFds[flushPipe].fd, data, count * sizeof(sensors_event_t));
                 if (nb < 0) {
                     ALOGE("error reading from flush pipe (%s)", strerror(errno));
                     return -errno;
                 }
                 nb = nb/sizeof(sensors_event_t);
                 mPollFds[flushPipe].revents = 0;
                 count -= nb;
                 nbEvents += nb;
                 data += nb;
             }
         }

         if (count) {
             ALOGV("%s: start poll syscall to kernel", __func__);
             n = poll(mPollFds, numFds, nbEvents ? 0 : -1);
             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;
             }
         }
     } 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);
 }

 #ifdef HAL_VERSION_GT_1_0
 static int poll__batch(struct sensors_poll_device_1 *dev,
                        int handle, int flags, int64_t period_ns, int64_t timeout)
 {
     FUNC_LOG;
     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)
 {
     FUNC_LOG;
     sensors_poll_context_t *ctx = (sensors_poll_context_t *)dev;
     return ctx->flush(handle);
 }
 #endif

 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();

     if (!dev->getInitialized()) {
         ALOGE("Failed to open the sensors (%s)", id);
         return status;
     }
 #ifdef HAL_VERSION_GE_1_0
     memset(&dev->device, 0, sizeof(sensors_poll_device_1));
 #else
     memset(&dev->device, 0, sizeof(sensors_poll_device_t));
 #endif

     dev->device.common.tag = HARDWARE_DEVICE_TAG;
 #ifdef ANDROID_KK
     dev->device.common.version = SENSORS_DEVICE_API_VERSION_1_1;
 #elif defined(ANDROID_JBMR2)
     dev->device.common.version = SENSORS_DEVICE_API_VERSION_1_0;
 #else
     dev->device.common.version = SENSORS_DEVICE_API_VERSION_1_3;
 #endif
     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;
 #ifdef HAL_VERSION_GT_1_0
     dev->device.batch           = poll__batch;
     dev->device.flush           = poll_flush;
 #endif
     dev->device.poll            = poll__poll;

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

     return status;
 }
	/*
	* Copyright (C) 2015 Intel Corp
	*
	* 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 <string.h>
	#include <linux/input.h>
	#include <utils/Atomic.h>
	#include <utils/Log.h>

	#include "sensors.h"
	#include "AlsSensor.h"

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

	#define DELAY_OUT_TIME 0x7FFFFFFF
	#define LIGHT_SENSOR_POLLTIME 2000000000

	#define SENSORS_LIGHT_HANDLE (ID_L)
	#define SENSORS_TILT_HANDLE (ID_T)
	/*****************************************************************************/

	/* The SENSORS Module */
	static struct sensor_t sSensorList[] = {
	{ "TSL2584 Ambient light sensor",
	"ams, ltd.",
	1, SENSORS_LIGHT_HANDLE,
	SENSOR_TYPE_LIGHT, 65535.0f, 1.0f, 0.015f,
	0, 0, 0, SENSOR_STRING_TYPE_LIGHT, NULL,
	5000000, SENSOR_FLAG_ON_CHANGE_MODE, { } },
	};

	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 ARRAY_SIZE(sSensorList);
	}

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

	struct sensors_poll_context_t {
	#ifdef HAL_VERSION_GE_1_0
	struct sensors_poll_device_1 device; // must be first
	#else
	struct sensors_poll_device_t device; // must be first
	#endif
	sensors_poll_context_t();
	~sensors_poll_context_t();
	int activate(int handle, int enabled);
	int setDelay(int handle, int64_t ns);
	#ifdef HAL_VERSION_GT_1_0
	int batch(int handle, int flags, int64_t period_ns, int64_t timeout);
	int flush(int handle);
	#endif
	int pollEvents(sensors_event_t* data, int count);
	bool getInitialized() { return mInitialized; };

	private:
	bool mInitialized;

	enum {
	light = 0,
	numSensorDrivers, /* wake pipe goes here */
	flushPipe, /* flush pipe goes here */
	numFds,
	};

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

	int handleToDriver(int handle) const {
	switch (handle) {
	case ID_L:
	return light;
	}
	return -EINVAL;
	}
	};

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

	sensors_poll_context_t::sensors_poll_context_t()
	{
	FUNC_LOG;
	mInitialized = false;
	/* Must clean this up early or else the destructor will make a mess */
	memset(mSensors, 0, sizeof(mSensors));

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

	int wakeFds[2];
	int result = pipe(wakeFds);
	ALOGE_IF(result<0, "error creating wake pipe (%s)", strerror(errno));
	result = fcntl(wakeFds[0], F_SETFL, O_NONBLOCK);
	ALOGE_IF(result<0, "error setting wakeFds[0] access mode (%s)", strerror(errno));
	result = fcntl(wakeFds[1], F_SETFL, O_NONBLOCK);
	ALOGE_IF(result<0, "error setting wakeFds[1] access mode (%s)", strerror(errno));
	mWritePipeFd = wakeFds[1];

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

	int flushFds[2];
	result = pipe(flushFds);
	ALOGE_IF(result<0, "error creating flush pipe (%s)", strerror(errno));
	result = fcntl(flushFds[0], F_SETFL, O_NONBLOCK);
	ALOGE_IF(result<0, "error setting flushFds[0] access mode (%s)", strerror(errno));
	result = fcntl(flushFds[1], F_SETFL, O_NONBLOCK);
	ALOGE_IF(result<0, "error setting flushFds[1] access mode (%s)", strerror(errno));
	mFlushWritePipeFd = flushFds[1];

	mPollFds[flushPipe].fd = flushFds[0];
	mPollFds[flushPipe].events = POLLIN;
	mPollFds[flushPipe].revents = 0;
	mInitialized = true;
	}

	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);
	close(mPollFds[flushPipe].fd);
	close(mFlushWritePipeFd);
	mInitialized = false;
	}

	int sensors_poll_context_t::activate(int handle, int enabled)
	{
	FUNC_LOG;
	if (!mInitialized) return -EINVAL;
	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);
	}

	#ifdef HAL_VERSION_GT_1_0
	int sensors_poll_context_t::batch(int handle, int flags, int64_t period_ns, int64_t timeout)
	{
	FUNC_LOG;
	int index = handleToDriver(handle);
	if (index < 0) return index;
	return mSensors[index]->batch(handle, flags, period_ns, timeout);
	}

	int sensors_poll_context_t::flush(int handle)
	{
	FUNC_LOG;
	int result;
	sensors_event_t flush_event_data;

	int index = handleToDriver(handle);
	if (index < 0) return index;

	result = mSensors[index]->isActivated(handle);
	if (!result)
	return -EINVAL;

	flush_event_data.sensor = 0;
	flush_event_data.timestamp = 0;
	flush_event_data.meta_data.sensor = handle;
	flush_event_data.meta_data.what = META_DATA_FLUSH_COMPLETE;
	flush_event_data.type = SENSOR_TYPE_META_DATA;
	flush_event_data.version = META_DATA_VERSION;

	result = write(mFlushWritePipeFd, &flush_event_data, sizeof(sensors_event_t));
	ALOGE_IF(result<0, "error sending flush event data (%s)", strerror(errno));

	return (result >= 0 ? 0 : result);
	}
	#endif

	int sensors_poll_context_t::pollEvents(sensors_event_t* data, int count)
	{
	FUNC_LOG;
	int nbEvents = 0;
	int n = 0;
	do {
	for (int i=0 ; count && i<numSensorDrivers; i++) {
	SensorBase* const sensor(mSensors[i]);
	if ((mPollFds[i].revents & POLLIN) \|\| (sensor->hasPendingEvents())) {
	int nb;
	nb = sensor->readEvents(data, count);
	if (nb < count) {
	mPollFds[i].revents = 0;
	}
	count -= nb;
	nbEvents += nb;
	data += nb;
	}
	}

	/* flush event data */
	if (count) {
	if (mPollFds[flushPipe].revents & POLLIN) {
	int nb = read(mPollFds[flushPipe].fd, data, count * sizeof(sensors_event_t));
	if (nb < 0) {
	ALOGE("error reading from flush pipe (%s)", strerror(errno));
	return -errno;
	}
	nb = nb/sizeof(sensors_event_t);
	mPollFds[flushPipe].revents = 0;
	count -= nb;
	nbEvents += nb;
	data += nb;
	}
	}

	if (count) {
	ALOGV("%s: start poll syscall to kernel", __func__);
	n = poll(mPollFds, numFds, nbEvents ? 0 : -1);
	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;
	}
	}
	} 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);
	}

	#ifdef HAL_VERSION_GT_1_0
	static int poll__batch(struct sensors_poll_device_1 *dev,
	int handle, int flags, int64_t period_ns, int64_t timeout)
	{
	FUNC_LOG;
	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)
	{
	FUNC_LOG;
	sensors_poll_context_t ctx = (sensors_poll_context_t )dev;
	return ctx->flush(handle);
	}
	#endif

	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();

	if (!dev->getInitialized()) {
	ALOGE("Failed to open the sensors (%s)", id);
	return status;
	}
	#ifdef HAL_VERSION_GE_1_0
	memset(&dev->device, 0, sizeof(sensors_poll_device_1));
	#else
	memset(&dev->device, 0, sizeof(sensors_poll_device_t));
	#endif

	dev->device.common.tag = HARDWARE_DEVICE_TAG;
	#ifdef ANDROID_KK
	dev->device.common.version = SENSORS_DEVICE_API_VERSION_1_1;
	#elif defined(ANDROID_JBMR2)
	dev->device.common.version = SENSORS_DEVICE_API_VERSION_1_0;
	#else
	dev->device.common.version = SENSORS_DEVICE_API_VERSION_1_3;
	#endif
	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;
	#ifdef HAL_VERSION_GT_1_0
	dev->device.batch = poll__batch;
	dev->device.flush = poll_flush;
	#endif
	dev->device.poll = poll__poll;

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

	return status;
	}