327 lines
10 KiB
C++
327 lines
10 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define ALOG_TAG "Sensors"
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#include <hardware/sensors.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <dirent.h>
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#include <math.h>
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#include <poll.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <linux/input.h>
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#include <utils/Atomic.h>
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#include <utils/Log.h>
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#include "sensors.h"
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#include "LightSensor.h"
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#include "ProximitySensor.h"
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#include "AkmSensor.h"
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#include "GyroSensor.h"
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/*****************************************************************************/
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#define DELAY_OUT_TIME 0x7FFFFFFF
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#define LIGHT_SENSOR_POLLTIME 2000000000
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#define SENSORS_ACCELERATION (1<<ID_A)
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#define SENSORS_MAGNETIC_FIELD (1<<ID_M)
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#define SENSORS_ORIENTATION (1<<ID_O)
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#define SENSORS_LIGHT (1<<ID_L)
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#define SENSORS_PROXIMITY (1<<ID_P)
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#define SENSORS_GYROSCOPE (1<<ID_GY)
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#define SENSORS_ACCELERATION_HANDLE 0
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#define SENSORS_MAGNETIC_FIELD_HANDLE 1
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#define SENSORS_ORIENTATION_HANDLE 2
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#define SENSORS_LIGHT_HANDLE 3
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#define SENSORS_PROXIMITY_HANDLE 4
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#define SENSORS_GYROSCOPE_HANDLE 5
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#define AKM_FTRACE 0
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#define AKM_DEBUG 0
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#define AKM_DATA 0
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/*****************************************************************************/
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/* The SENSORS Module */
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static const struct sensor_t sSensorList[] = {
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{ "KR3DM 3-axis Accelerometer",
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"STMicroelectronics",
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1, SENSORS_ACCELERATION_HANDLE,
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SENSOR_TYPE_ACCELEROMETER, RANGE_A, CONVERT_A, 0.23f, 20000, { } },
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{ "AK8975 3-axis Magnetic field sensor",
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"Asahi Kasei Microdevices",
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1, SENSORS_MAGNETIC_FIELD_HANDLE,
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SENSOR_TYPE_MAGNETIC_FIELD, 2000.0f, CONVERT_M, 6.8f, 16667, { } },
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{ "AK8973 Orientation sensor",
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"Asahi Kasei Microdevices",
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1, SENSORS_ORIENTATION_HANDLE,
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SENSOR_TYPE_ORIENTATION, 360.0f, CONVERT_O, 7.8f, 16667, { } },
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{ "CM3663 Light sensor",
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"Capella Microsystems",
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1, SENSORS_LIGHT_HANDLE,
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SENSOR_TYPE_LIGHT, 10240.0f, 1.0f, 0.75f, 0, { } },
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{ "CM3663 Proximity sensor",
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"Capella Microsystems",
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1, SENSORS_PROXIMITY_HANDLE,
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SENSOR_TYPE_PROXIMITY, 5.0f, 5.0f, 0.75f, 0, { } },
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{ "K3G Gyroscope sensor",
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"STMicroelectronics",
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1, SENSORS_GYROSCOPE_HANDLE,
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SENSOR_TYPE_GYROSCOPE, RANGE_GYRO, CONVERT_GYRO, 6.1f, 1190, { } },
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};
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static int open_sensors(const struct hw_module_t* module, const char* id,
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struct hw_device_t** device);
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static int sensors__get_sensors_list(struct sensors_module_t* module,
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struct sensor_t const** list)
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{
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*list = sSensorList;
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return ARRAY_SIZE(sSensorList);
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}
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static struct hw_module_methods_t sensors_module_methods = {
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open: open_sensors
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};
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struct sensors_module_t HAL_MODULE_INFO_SYM = {
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common: {
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tag: HARDWARE_MODULE_TAG,
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version_major: 1,
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version_minor: 0,
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id: SENSORS_HARDWARE_MODULE_ID,
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name: "Samsung Sensor module",
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author: "Samsung Electronic Company",
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methods: &sensors_module_methods,
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},
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get_sensors_list: sensors__get_sensors_list,
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};
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struct sensors_poll_context_t {
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struct sensors_poll_device_t device; // must be first
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sensors_poll_context_t();
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~sensors_poll_context_t();
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int activate(int handle, int enabled);
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int setDelay(int handle, int64_t ns);
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int pollEvents(sensors_event_t* data, int count);
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private:
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enum {
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light = 0,
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proximity = 1,
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akm = 2,
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gyro = 3,
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numSensorDrivers,
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numFds,
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};
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static const size_t wake = numFds - 1;
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static const char WAKE_MESSAGE = 'W';
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struct pollfd mPollFds[numFds];
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int mWritePipeFd;
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SensorBase* mSensors[numSensorDrivers];
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int handleToDriver(int handle) const {
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switch (handle) {
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case ID_A:
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case ID_M:
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case ID_O:
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return akm;
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case ID_P:
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return proximity;
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case ID_L:
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return light;
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case ID_GY:
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return gyro;
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}
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return -EINVAL;
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}
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};
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/*****************************************************************************/
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sensors_poll_context_t::sensors_poll_context_t()
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{
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mSensors[light] = new LightSensor();
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mPollFds[light].fd = mSensors[light]->getFd();
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mPollFds[light].events = POLLIN;
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mPollFds[light].revents = 0;
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mSensors[proximity] = new ProximitySensor();
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mPollFds[proximity].fd = mSensors[proximity]->getFd();
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mPollFds[proximity].events = POLLIN;
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mPollFds[proximity].revents = 0;
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mSensors[akm] = new AkmSensor();
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mPollFds[akm].fd = mSensors[akm]->getFd();
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mPollFds[akm].events = POLLIN;
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mPollFds[akm].revents = 0;
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mSensors[gyro] = new GyroSensor();
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mPollFds[gyro].fd = mSensors[gyro]->getFd();
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mPollFds[gyro].events = POLLIN;
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mPollFds[gyro].revents = 0;
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int wakeFds[2];
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int result = pipe(wakeFds);
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ALOGE_IF(result<0, "error creating wake pipe (%s)", strerror(errno));
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fcntl(wakeFds[0], F_SETFL, O_NONBLOCK);
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fcntl(wakeFds[1], F_SETFL, O_NONBLOCK);
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mWritePipeFd = wakeFds[1];
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mPollFds[wake].fd = wakeFds[0];
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mPollFds[wake].events = POLLIN;
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mPollFds[wake].revents = 0;
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}
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sensors_poll_context_t::~sensors_poll_context_t() {
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for (int i=0 ; i<numSensorDrivers ; i++) {
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delete mSensors[i];
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}
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close(mPollFds[wake].fd);
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close(mWritePipeFd);
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}
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int sensors_poll_context_t::activate(int handle, int enabled) {
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int index = handleToDriver(handle);
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if (index < 0) return index;
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int err = mSensors[index]->enable(handle, enabled);
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if (enabled && !err) {
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const char wakeMessage(WAKE_MESSAGE);
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int result = write(mWritePipeFd, &wakeMessage, 1);
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ALOGE_IF(result<0, "error sending wake message (%s)", strerror(errno));
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}
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return err;
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}
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int sensors_poll_context_t::setDelay(int handle, int64_t ns) {
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int index = handleToDriver(handle);
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if (index < 0) return index;
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return mSensors[index]->setDelay(handle, ns);
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}
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int sensors_poll_context_t::pollEvents(sensors_event_t* data, int count)
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{
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int nbEvents = 0;
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int n = 0;
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do {
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// see if we have some leftover from the last poll()
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for (int i=0 ; count && i<numSensorDrivers ; i++) {
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SensorBase* const sensor(mSensors[i]);
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if ((mPollFds[i].revents & POLLIN) || (sensor->hasPendingEvents())) {
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int nb = sensor->readEvents(data, count);
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if (nb < count) {
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// no more data for this sensor
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mPollFds[i].revents = 0;
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}
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count -= nb;
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nbEvents += nb;
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data += nb;
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}
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}
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if (count) {
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// we still have some room, so try to see if we can get
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// some events immediately or just wait if we don't have
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// anything to return
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n = poll(mPollFds, numFds, nbEvents ? 0 : -1);
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if (n<0) {
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ALOGE("poll() failed (%s)", strerror(errno));
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return -errno;
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}
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if (mPollFds[wake].revents & POLLIN) {
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char msg;
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int result = read(mPollFds[wake].fd, &msg, 1);
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ALOGE_IF(result<0, "error reading from wake pipe (%s)", strerror(errno));
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ALOGE_IF(msg != WAKE_MESSAGE, "unknown message on wake queue (0x%02x)", int(msg));
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mPollFds[wake].revents = 0;
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}
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}
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// if we have events and space, go read them
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} while (n && count);
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return nbEvents;
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}
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/*****************************************************************************/
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static int poll__close(struct hw_device_t *dev)
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{
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sensors_poll_context_t *ctx = (sensors_poll_context_t *)dev;
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if (ctx) {
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delete ctx;
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}
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return 0;
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}
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static int poll__activate(struct sensors_poll_device_t *dev,
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int handle, int enabled) {
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sensors_poll_context_t *ctx = (sensors_poll_context_t *)dev;
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return ctx->activate(handle, enabled);
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}
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static int poll__setDelay(struct sensors_poll_device_t *dev,
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int handle, int64_t ns) {
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sensors_poll_context_t *ctx = (sensors_poll_context_t *)dev;
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return ctx->setDelay(handle, ns);
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}
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static int poll__poll(struct sensors_poll_device_t *dev,
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sensors_event_t* data, int count) {
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sensors_poll_context_t *ctx = (sensors_poll_context_t *)dev;
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return ctx->pollEvents(data, count);
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}
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/*****************************************************************************/
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/** Open a new instance of a sensor device using name */
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static int open_sensors(const struct hw_module_t* module, const char* id,
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struct hw_device_t** device)
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{
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int status = -EINVAL;
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sensors_poll_context_t *dev = new sensors_poll_context_t();
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memset(&dev->device, 0, sizeof(sensors_poll_device_t));
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dev->device.common.tag = HARDWARE_DEVICE_TAG;
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dev->device.common.version = 0;
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dev->device.common.module = const_cast<hw_module_t*>(module);
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dev->device.common.close = poll__close;
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dev->device.activate = poll__activate;
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dev->device.setDelay = poll__setDelay;
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dev->device.poll = poll__poll;
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*device = &dev->device.common;
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status = 0;
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return status;
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}
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