sensors/nusensors.cpp - device/moto/stingray - Git at Google

 /*
  * Copyright (C) 2008 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <hardware/sensors.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <dirent.h>
 #include <math.h>

 #include <poll.h>
 #include <pthread.h>

 #include <linux/input.h>

 #include <cutils/atomic.h>
 #include <cutils/log.h>

 #include "nusensors.h"
 #include "AccelerationSensor.h"
 #include "LightSensor.h"
 #include "AkmSensor.h"
 #include "PressureSensor.h"
 #include "GyroSensor.h"

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

 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 {
 	acceleration    = 0,
 	light           = 1,
 	akm		= 2,
 	pressure	= 3,
 	gyro		= 4,
         numSensorDrivers,
         numFds,
     };

     static const size_t wake = numFds - 1;
     static const char WAKE_MESSAGE = 'W';
     struct pollfd mPollFds[numFds];
     int mWritePipeFd;
     SensorBase* mSensors[numSensorDrivers];

     int handleToDriver(int handle) const {
         switch (handle) {
             case ID_A:
                 return acceleration;
             case ID_M:
             case ID_O:
                 return akm;
             case ID_G:
                 return gyro;
             case ID_L:
                 return light;
 	    case ID_B:
                 return pressure;
         }
         return -EINVAL;
     }
 };

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

 sensors_poll_context_t::sensors_poll_context_t()
 {
     mSensors[acceleration] = new AccelerationSensor();
     mPollFds[acceleration].fd = mSensors[acceleration]->getFd();
     mPollFds[acceleration].events = POLLIN;
     mPollFds[acceleration].revents = 0;

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

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

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

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

 sensors_poll_context_t::~sensors_poll_context_t() {
     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) {
     int index = handleToDriver(handle);
     if (index < 0) return index;
     int err =  mSensors[index]->enable(handle, enabled);
     if (!err && handle == ID_O) {
         err = static_cast<AccelerationSensor*>(
                 mSensors[acceleration])->enableOrientation(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<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;
             }
         }

         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
             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;
             }
         }
         // 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);
 }

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

 int init_nusensors(hw_module_t const* module, 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.
	*/

	#include <hardware/sensors.h>
	#include <fcntl.h>
	#include <errno.h>
	#include <dirent.h>
	#include <math.h>

	#include <poll.h>
	#include <pthread.h>

	#include <linux/input.h>

	#include <cutils/atomic.h>
	#include <cutils/log.h>

	#include "nusensors.h"
	#include "AccelerationSensor.h"
	#include "LightSensor.h"
	#include "AkmSensor.h"
	#include "PressureSensor.h"
	#include "GyroSensor.h"

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

	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 {
	acceleration = 0,
	light = 1,
	akm = 2,
	pressure = 3,
	gyro = 4,
	numSensorDrivers,
	numFds,
	};

	static const size_t wake = numFds - 1;
	static const char WAKE_MESSAGE = 'W';
	struct pollfd mPollFds[numFds];
	int mWritePipeFd;
	SensorBase* mSensors[numSensorDrivers];

	int handleToDriver(int handle) const {
	switch (handle) {
	case ID_A:
	return acceleration;
	case ID_M:
	case ID_O:
	return akm;
	case ID_G:
	return gyro;
	case ID_L:
	return light;
	case ID_B:
	return pressure;
	}
	return -EINVAL;
	}
	};

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

	sensors_poll_context_t::sensors_poll_context_t()
	{
	mSensors[acceleration] = new AccelerationSensor();
	mPollFds[acceleration].fd = mSensors[acceleration]->getFd();
	mPollFds[acceleration].events = POLLIN;
	mPollFds[acceleration].revents = 0;

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

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

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

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

	sensors_poll_context_t::~sensors_poll_context_t() {
	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) {
	int index = handleToDriver(handle);
	if (index < 0) return index;
	int err = mSensors[index]->enable(handle, enabled);
	if (!err && handle == ID_O) {
	err = static_cast<AccelerationSensor*>(
	mSensors[acceleration])->enableOrientation(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<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;
	}
	}

	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
	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;
	}
	}
	// 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);
	}

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

	int init_nusensors(hw_module_t const* module, 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;
	}