manta: senors: add HAL for light and pressure sensors
This HAL supports sensors using Industrial I/O subsystem.
These sensor devices will be located in /sys/bus/iio/devices.
Light Sensor:
IIO device name: lightsensor-level
chan_type: IIO_LIGHT
channel: in_illuminance0_input
event: /dev/iio:device? (assigned dynamically)
Pressure Sensor:
IIO device name: barometer
chan_type: IIO_PRESSURE (This is not yet defined in main stream.)
channel: in_pressure0_input
event: /dev/iio:device? (assigned dynamically)
TODO: iio/events.h and iio/types.h should be moved to
external/kernel-headers/original.
Change-Id: Ifbeb2f8e7ef7ac09f5b0727a2376c652e5f9e800
Signed-off-by: Won Hyoung Lee <whlee@sta.samsung.com>
diff --git a/libsensors/sensors.cpp b/libsensors/sensors.cpp
new file mode 100644
index 0000000..d10091b
--- /dev/null
+++ b/libsensors/sensors.cpp
@@ -0,0 +1,319 @@
+/*
+ * Copyright (C) 2012 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"
+//#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 <utils/Atomic.h>
+#include <utils/Log.h>
+
+#include "sensors.h"
+
+#include "LightSensor.h"
+#include "PressureSensor.h"
+
+
+/*****************************************************************************/
+
+#define DELAY_OUT_TIME 0x7FFFFFFF
+
+#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 (2)
+static struct sensor_t sSensorList[LOCAL_SENSORS] = {
+ { "BH1721fvc Light sensor",
+ "Rohm",
+ 1, SENSORS_LIGHT_HANDLE,
+ SENSOR_TYPE_LIGHT, 65528.0f, 1.0f, 0.20f, 16000, { } },
+ { "BMP182 Pressure sensor",
+ "Bosch",
+ 1, SENSORS_PRESSURE_HANDLE,
+ SENSOR_TYPE_PRESSURE, 1100.0f, 0.01f, 0.06f, 50000, { } },
+};
+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 {
+ light = 0,
+ pressure,
+ numSensorDrivers, // wake pipe goes here
+ 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_L:
+ return light;
+ case ID_PR:
+ return pressure;
+ }
+ return -EINVAL;
+ }
+};
+
+/*****************************************************************************/
+
+sensors_poll_context_t::sensors_poll_context_t()
+{
+ FUNC_LOG;
+ numSensors = LOCAL_SENSORS;
+
+ mSensors[light] = new LightSensor();
+ mPollFds[light].fd = mSensors[light]->getFd();
+ mPollFds[light].events = POLLIN;
+ mPollFds[light].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;
+}
+
+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;
+ }
+ }
+
+ 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 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;
+}