sensors.cpp - fp2-dev/platform/hardware/qcom/sensors - Gitiles

 /*
  * 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.
  */

 #define LOG_TAG "Sensors"

 #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 "AccelSensor.h"
 #include "LightSensor.h"
 #include "ProximitySensor.h"
 #include "AkmSensor.h"
 #include "GyroSensor.h"
 #include "PressureSensor.h"

 /*****************************************************************************/
 static struct sensor_t sensor_list[MAX_SENSORS];
 static char name[MAX_SENSORS][SYSFS_MAXLEN];
 static char vendor[MAX_SENSORS][SYSFS_MAXLEN];
 static int dynamic_sensor_number;

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

 static int get_node(char *buf, char *path) {
 	char * fret;
 	int len = 0;
 	FILE * fd;

 	if (NULL == buf || NULL == path)
 		return -1;

 	fd = fopen(path, "r");
 	if (NULL == fd)
 		return -1;

 	fret = fgets(buf,SYSFS_MAXLEN,fd);
 	if (NULL == fret) {
 		fclose(fd);
 		return -1;
 	}

 	len = strlen(buf);

 	if (buf[len - 1] == '\n')
 		buf[len - 1] = '\0';

 	fclose(fd);
 	return 0;
 }

 static int get_sensors_list() {
 	int number = 0;
 	int fd = -1;
 	int err = -1;
 	const char *dirname = SYSFS_CLASS;
 	char devname[PATH_MAX];
 	char *filename;
 	char *nodename;
 	DIR *dir;
 	struct dirent *de;
 	char tempname[SYSFS_MAXLEN];

 	dir = opendir(dirname);
 	if(dir == NULL) {
 		dynamic_sensor_number = 0;
 		return -1;
 	}
 	strlcpy(devname, dirname, PATH_MAX - SYSFS_MAXLEN * 2 - 2);
 	filename = devname + strlen(devname);
 	*filename++ = '/';

 	while((de = readdir(dir))) {
 		if(de->d_name[0] == '.' &&
 			(de->d_name[1] == '\0' ||
 				(de->d_name[1] == '.' && de->d_name[2] == '\0')))
 			continue;

 		strlcpy(filename, de->d_name, SYSFS_MAXLEN);
 		nodename = filename + strlen(de->d_name);
 		*nodename++ = '/';

 		strlcpy(nodename, SYSFS_NAME, SYSFS_MAXLEN);
 		err = get_node(name[number], devname);
 		if(err < 0)
 			goto error;
 		sensor_list[number].name = name[number];

 		strlcpy(nodename, SYSFS_VENDOR, SYSFS_MAXLEN);
 		err = get_node(vendor[number], devname);
 		if(err < 0)
 			goto error;
 		sensor_list[number].vendor = vendor[number];

 		strlcpy(nodename, SYSFS_VERSION, SYSFS_MAXLEN);
 		err = get_node(tempname, devname);
 		if(err < 0)
 			goto error;
 		sensor_list[number].version = atoi(tempname);

 		strlcpy(nodename, SYSFS_HANDLE, SYSFS_MAXLEN);
 		err = get_node(tempname, devname);
 		if(err < 0)
 			goto error;
 		sensor_list[number].handle = atoi(tempname);

 		strlcpy(nodename, SYSFS_TYPE, SYSFS_MAXLEN);
 		err = get_node(tempname, devname);
 		if(err < 0)
 			goto error;
 		sensor_list[number].type = atoi(tempname);

 		strlcpy(nodename, SYSFS_MAXRANGE, SYSFS_MAXLEN);
 		err = get_node(tempname, devname);
 		if(err < 0)
 			goto error;
 		sensor_list[number].maxRange = atof(tempname);

 		strlcpy(nodename, SYSFS_RESOLUTION, SYSFS_MAXLEN);
 		err = get_node(tempname, devname);
 		if(err < 0)
 			goto error;
 		sensor_list[number].resolution = atof(tempname);

 		strlcpy(nodename, SYSFS_POWER, SYSFS_MAXLEN);
 		err = get_node(tempname, devname);
 		if(err < 0)
 			goto error;
 		sensor_list[number].power = atof(tempname);

 		strlcpy(nodename, SYSFS_MINDELAY, SYSFS_MAXLEN);
 		err = get_node(tempname, devname);
 		if(err < 0)
 			goto error;
 		sensor_list[number].minDelay = atoi(tempname);

 		number++;
 	}
 	closedir(dir);
 	dynamic_sensor_number = number;
 	return number;

 error:
 	dynamic_sensor_number = 0;
 	closedir(dir);
 	ALOGE("get_sensors_list failed!");
 	return -1;
 }

 static int sensors__get_sensors_list(struct sensors_module_t* module,
 								 struct sensor_t const** list)
 {
 	if(dynamic_sensor_number > 0) {
 		*list = sensor_list;
 		return dynamic_sensor_number;
 	} else { /* If we could not find any sensor folder, load the default.*/
 		ALOGE("no list:get_sensors_list failed!");
 		return 0;
 	}
 }

 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: "Quic Sensor module",
 				author: "Quic",
 				methods: &sensors_module_methods,
 		},
 		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:
 	int light;
 	int proximity;
 	int compass;
 	int gyro;
 	int accel;
 	int pressure;
 	static const size_t wake = MAX_SENSORS;
 	static const char WAKE_MESSAGE = 'W';
 	struct pollfd mPollFds[MAX_SENSORS+1];
 	int mWritePipeFd;
 	int device_id;
 	SensorBase* mSensors[MAX_SENSORS];

 	int handleToDriver(int handle) const {
 		switch (handle) {
 			case SENSORS_ACCELERATION_HANDLE:
 				return accel;
 			case SENSORS_MAGNETIC_FIELD_HANDLE:
 			case SENSORS_ORIENTATION_HANDLE:
 				return compass;
 			case SENSORS_PROXIMITY_HANDLE:
 				return proximity;
 			case SENSORS_LIGHT_HANDLE:
 				return light;
 			case SENSORS_GYROSCOPE_HANDLE:
 				return gyro;
 			case SENSORS_PRESSURE_HANDLE:
 				return pressure;
 		}
 		return -EINVAL;
 	}
 };

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

 sensors_poll_context_t::sensors_poll_context_t()
 {
 	int number;
 	int handle;
 	light = -1;
 	proximity = -1;
 	compass = -1;
 	gyro = -1;
 	accel = -1;
 	pressure = -1;
 	device_id = 0;
 	number = get_sensors_list();

 	if(number <= 0){ /* use the static sensor list */
 		light = 0;
 		proximity = 1;
 		compass = 2;
 		gyro = 3;
 		accel = 4;
 		pressure = 5;
 		device_id = 6;

 		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;

 #if 0
 		mSensors[compass] = new AkmSensor();
 		mPollFds[compass].fd = mSensors[compass]->getFd();
 		mPollFds[compass].events = POLLIN;
 		mPollFds[compass].revents = 0;
 #endif

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

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

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

 	} else { /* use the dynamic sensor list */
 		for (handle = 0; handle < number; handle++) {
 			switch (sensor_list[handle].handle) {
 				case SENSORS_ACCELERATION_HANDLE:
 				mSensors[device_id] = new AccelSensor(name[handle]);
 				mPollFds[device_id].fd = mSensors[device_id]->getFd();
 				mPollFds[device_id].events = POLLIN;
 				mPollFds[device_id].revents = 0;
 				accel = device_id;
 				break;
 #if 0
 				case SENSORS_MAGNETIC_FIELD_HANDLE:
 				mSensors[device_id] = new AkmSensor();
 				mPollFds[device_id].fd = mSensors[device_id]->getFd();
 				mPollFds[device_id].events = POLLIN;
 				mPollFds[device_id].revents = 0;
 				compass = device_id;
 				break;
 #endif
 				case SENSORS_PROXIMITY_HANDLE:
 				mSensors[device_id] = new ProximitySensor(name[handle]);
 				mPollFds[device_id].fd = mSensors[device_id]->getFd();
 				mPollFds[device_id].events = POLLIN;
 				mPollFds[device_id].revents = 0;
 				proximity = device_id;
 				break;

 				case SENSORS_LIGHT_HANDLE:
 				mSensors[device_id] = new LightSensor(name[handle]);
 				mPollFds[device_id].fd = mSensors[device_id]->getFd();
 				mPollFds[device_id].events = POLLIN;
 				mPollFds[device_id].revents = 0;
 				light = device_id;
 				break;

 				case SENSORS_GYROSCOPE_HANDLE:
 				mSensors[device_id] = new GyroSensor(name[handle]);
 				mPollFds[device_id].fd = mSensors[device_id]->getFd();
 				mPollFds[device_id].events = POLLIN;
 				mPollFds[device_id].revents = 0;
 				gyro = device_id;
 				break;

 				case SENSORS_PRESSURE_HANDLE:
 				mSensors[device_id] = new PressureSensor(name[handle]);
 				mPollFds[device_id].fd = mSensors[device_id]->getFd();
 				mPollFds[device_id].events = POLLIN;
 				mPollFds[device_id].revents = 0;
 				pressure = device_id;
 				break;

 				default:
 				ALOGE("No handle %d for this type sensor!",handle);
 				device_id--;
 			}
 			device_id++;
 		}
 	}
 	ALOGI("The avaliable sensor handle number is %d",device_id);
 	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[device_id].fd = wakeFds[0];
 	mPollFds[device_id].events = POLLIN;
 	mPollFds[device_id].revents = 0;
 }

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

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

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

 	do {
 		// see if we have some leftover from the last poll()
 		for (int i=0 ; count && i<device_id ; 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;
 			}
 		}

 		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
 			do {
 				n = poll(mPollFds, device_id+1, nbEvents ? 0 : -1);
 			} while (n < 0 && errno == EINTR);
 			if (n<0) {
 				ALOGE("poll() failed (%s)", strerror(errno));
 				return -errno;
 			}
 			if (mPollFds[device_id].revents & POLLIN) {
 				char msg;
 				int result = read(mPollFds[device_id].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[device_id].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)
 {
 	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;
 	return ctx->setDelay(handle, ns);
 }

 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);
 }

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

 /** 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();

 		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) 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.
	*/

	#define LOG_TAG "Sensors"

	#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 "AccelSensor.h"
	#include "LightSensor.h"
	#include "ProximitySensor.h"
	#include "AkmSensor.h"
	#include "GyroSensor.h"
	#include "PressureSensor.h"

	/*****************************************************************************/
	static struct sensor_t sensor_list[MAX_SENSORS];
	static char name[MAX_SENSORS][SYSFS_MAXLEN];
	static char vendor[MAX_SENSORS][SYSFS_MAXLEN];
	static int dynamic_sensor_number;

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

	static int get_node(char buf, char path) {
	char * fret;
	int len = 0;
	FILE * fd;

	if (NULL == buf \|\| NULL == path)
	return -1;

	fd = fopen(path, "r");
	if (NULL == fd)
	return -1;

	fret = fgets(buf,SYSFS_MAXLEN,fd);
	if (NULL == fret) {
	fclose(fd);
	return -1;
	}

	len = strlen(buf);

	if (buf[len - 1] == '\n')
	buf[len - 1] = '\0';

	fclose(fd);
	return 0;
	}

	static int get_sensors_list() {
	int number = 0;
	int fd = -1;
	int err = -1;
	const char *dirname = SYSFS_CLASS;
	char devname[PATH_MAX];
	char *filename;
	char *nodename;
	DIR *dir;
	struct dirent *de;
	char tempname[SYSFS_MAXLEN];

	dir = opendir(dirname);
	if(dir == NULL) {
	dynamic_sensor_number = 0;
	return -1;
	}
	strlcpy(devname, dirname, PATH_MAX - SYSFS_MAXLEN * 2 - 2);
	filename = devname + strlen(devname);
	*filename++ = '/';

	while((de = readdir(dir))) {
	if(de->d_name[0] == '.' &&
	(de->d_name[1] == '\0' \|\|
	(de->d_name[1] == '.' && de->d_name[2] == '\0')))
	continue;

	strlcpy(filename, de->d_name, SYSFS_MAXLEN);
	nodename = filename + strlen(de->d_name);
	*nodename++ = '/';

	strlcpy(nodename, SYSFS_NAME, SYSFS_MAXLEN);
	err = get_node(name[number], devname);
	if(err < 0)
	goto error;
	sensor_list[number].name = name[number];

	strlcpy(nodename, SYSFS_VENDOR, SYSFS_MAXLEN);
	err = get_node(vendor[number], devname);
	if(err < 0)
	goto error;
	sensor_list[number].vendor = vendor[number];

	strlcpy(nodename, SYSFS_VERSION, SYSFS_MAXLEN);
	err = get_node(tempname, devname);
	if(err < 0)
	goto error;
	sensor_list[number].version = atoi(tempname);

	strlcpy(nodename, SYSFS_HANDLE, SYSFS_MAXLEN);
	err = get_node(tempname, devname);
	if(err < 0)
	goto error;
	sensor_list[number].handle = atoi(tempname);

	strlcpy(nodename, SYSFS_TYPE, SYSFS_MAXLEN);
	err = get_node(tempname, devname);
	if(err < 0)
	goto error;
	sensor_list[number].type = atoi(tempname);

	strlcpy(nodename, SYSFS_MAXRANGE, SYSFS_MAXLEN);
	err = get_node(tempname, devname);
	if(err < 0)
	goto error;
	sensor_list[number].maxRange = atof(tempname);

	strlcpy(nodename, SYSFS_RESOLUTION, SYSFS_MAXLEN);
	err = get_node(tempname, devname);
	if(err < 0)
	goto error;
	sensor_list[number].resolution = atof(tempname);

	strlcpy(nodename, SYSFS_POWER, SYSFS_MAXLEN);
	err = get_node(tempname, devname);
	if(err < 0)
	goto error;
	sensor_list[number].power = atof(tempname);

	strlcpy(nodename, SYSFS_MINDELAY, SYSFS_MAXLEN);
	err = get_node(tempname, devname);
	if(err < 0)
	goto error;
	sensor_list[number].minDelay = atoi(tempname);

	number++;
	}
	closedir(dir);
	dynamic_sensor_number = number;
	return number;

	error:
	dynamic_sensor_number = 0;
	closedir(dir);
	ALOGE("get_sensors_list failed!");
	return -1;
	}

	static int sensors__get_sensors_list(struct sensors_module_t* module,
	struct sensor_t const** list)
	{
	if(dynamic_sensor_number > 0) {
	*list = sensor_list;
	return dynamic_sensor_number;
	} else { /* If we could not find any sensor folder, load the default.*/
	ALOGE("no list:get_sensors_list failed!");
	return 0;
	}
	}

	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: "Quic Sensor module",
	author: "Quic",
	methods: &sensors_module_methods,
	},
	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:
	int light;
	int proximity;
	int compass;
	int gyro;
	int accel;
	int pressure;
	static const size_t wake = MAX_SENSORS;
	static const char WAKE_MESSAGE = 'W';
	struct pollfd mPollFds[MAX_SENSORS+1];
	int mWritePipeFd;
	int device_id;
	SensorBase* mSensors[MAX_SENSORS];

	int handleToDriver(int handle) const {
	switch (handle) {
	case SENSORS_ACCELERATION_HANDLE:
	return accel;
	case SENSORS_MAGNETIC_FIELD_HANDLE:
	case SENSORS_ORIENTATION_HANDLE:
	return compass;
	case SENSORS_PROXIMITY_HANDLE:
	return proximity;
	case SENSORS_LIGHT_HANDLE:
	return light;
	case SENSORS_GYROSCOPE_HANDLE:
	return gyro;
	case SENSORS_PRESSURE_HANDLE:
	return pressure;
	}
	return -EINVAL;
	}
	};

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

	sensors_poll_context_t::sensors_poll_context_t()
	{
	int number;
	int handle;
	light = -1;
	proximity = -1;
	compass = -1;
	gyro = -1;
	accel = -1;
	pressure = -1;
	device_id = 0;
	number = get_sensors_list();

	if(number <= 0){ /* use the static sensor list */
	light = 0;
	proximity = 1;
	compass = 2;
	gyro = 3;
	accel = 4;
	pressure = 5;
	device_id = 6;

	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;

	#if 0
	mSensors[compass] = new AkmSensor();
	mPollFds[compass].fd = mSensors[compass]->getFd();
	mPollFds[compass].events = POLLIN;
	mPollFds[compass].revents = 0;
	#endif

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

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

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

	} else { /* use the dynamic sensor list */
	for (handle = 0; handle < number; handle++) {
	switch (sensor_list[handle].handle) {
	case SENSORS_ACCELERATION_HANDLE:
	mSensors[device_id] = new AccelSensor(name[handle]);
	mPollFds[device_id].fd = mSensors[device_id]->getFd();
	mPollFds[device_id].events = POLLIN;
	mPollFds[device_id].revents = 0;
	accel = device_id;
	break;
	#if 0
	case SENSORS_MAGNETIC_FIELD_HANDLE:
	mSensors[device_id] = new AkmSensor();
	mPollFds[device_id].fd = mSensors[device_id]->getFd();
	mPollFds[device_id].events = POLLIN;
	mPollFds[device_id].revents = 0;
	compass = device_id;
	break;
	#endif
	case SENSORS_PROXIMITY_HANDLE:
	mSensors[device_id] = new ProximitySensor(name[handle]);
	mPollFds[device_id].fd = mSensors[device_id]->getFd();
	mPollFds[device_id].events = POLLIN;
	mPollFds[device_id].revents = 0;
	proximity = device_id;
	break;

	case SENSORS_LIGHT_HANDLE:
	mSensors[device_id] = new LightSensor(name[handle]);
	mPollFds[device_id].fd = mSensors[device_id]->getFd();
	mPollFds[device_id].events = POLLIN;
	mPollFds[device_id].revents = 0;
	light = device_id;
	break;

	case SENSORS_GYROSCOPE_HANDLE:
	mSensors[device_id] = new GyroSensor(name[handle]);
	mPollFds[device_id].fd = mSensors[device_id]->getFd();
	mPollFds[device_id].events = POLLIN;
	mPollFds[device_id].revents = 0;
	gyro = device_id;
	break;

	case SENSORS_PRESSURE_HANDLE:
	mSensors[device_id] = new PressureSensor(name[handle]);
	mPollFds[device_id].fd = mSensors[device_id]->getFd();
	mPollFds[device_id].events = POLLIN;
	mPollFds[device_id].revents = 0;
	pressure = device_id;
	break;

	default:
	ALOGE("No handle %d for this type sensor!",handle);
	device_id--;
	}
	device_id++;
	}
	}
	ALOGI("The avaliable sensor handle number is %d",device_id);
	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[device_id].fd = wakeFds[0];
	mPollFds[device_id].events = POLLIN;
	mPollFds[device_id].revents = 0;
	}

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

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

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

	do {
	// see if we have some leftover from the last poll()
	for (int i=0 ; count && i<device_id ; 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;
	}
	}

	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
	do {
	n = poll(mPollFds, device_id+1, nbEvents ? 0 : -1);
	} while (n < 0 && errno == EINTR);
	if (n<0) {
	ALOGE("poll() failed (%s)", strerror(errno));
	return -errno;
	}
	if (mPollFds[device_id].revents & POLLIN) {
	char msg;
	int result = read(mPollFds[device_id].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[device_id].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)
	{
	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;
	return ctx->setDelay(handle, ns);
	}

	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);
	}

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

	/** 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();

	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;
	}