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authorAndrew Dodd <atd7@cornell.edu>2012-07-30 18:44:58 -0400
committerAndrew Dodd <atd7@cornell.edu>2012-08-15 23:11:21 -0400
commit2d09c07225eb44e8371563bca98217885d7cd7c7 (patch)
tree6d73980538491eb91d43a34f8040df7ec2751685 /libsensors/PressureSensor.cpp
parent90779d4af0d22c12ca3502b9e6a126d5db8d9e9a (diff)
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n7000: Add pressure sensor to libsensors
Pressure sensor driver pulled from tuna Change-Id: I4da058a1c779f4ab73bc8c03fcf1ff836ed105f6
Diffstat (limited to 'libsensors/PressureSensor.cpp')
-rw-r--r--libsensors/PressureSensor.cpp142
1 files changed, 142 insertions, 0 deletions
diff --git a/libsensors/PressureSensor.cpp b/libsensors/PressureSensor.cpp
new file mode 100644
index 0000000..5e9f86e
--- /dev/null
+++ b/libsensors/PressureSensor.cpp
@@ -0,0 +1,142 @@
+/*
+ * 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 <fcntl.h>
+#include <errno.h>
+#include <math.h>
+#include <poll.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <sys/select.h>
+
+#include <cutils/log.h>
+
+#include "PressureSensor.h"
+
+/*
+ * The BMP driver gives pascal values.
+ * It needs to be changed into hectoPascal
+ */
+#define PRESSURE_HECTO (1.0f/100.0f)
+
+/*****************************************************************************/
+
+PressureSensor::PressureSensor()
+ : SensorBase(NULL, "barometer_sensor"),
+ mEnabled(0),
+ mInputReader(4),
+ mHasPendingEvent(false)
+{
+ mPendingEvent.version = sizeof(sensors_event_t);
+ mPendingEvent.sensor = ID_PR;
+ mPendingEvent.type = SENSOR_TYPE_PRESSURE;
+ memset(mPendingEvent.data, 0, sizeof(mPendingEvent.data));
+
+ if (data_fd) {
+ strcpy(input_sysfs_path, "/sys/class/input/");
+ strcat(input_sysfs_path, input_name);
+ strcat(input_sysfs_path, "/device/");
+ input_sysfs_path_len = strlen(input_sysfs_path);
+ enable(0, 1);
+ }
+}
+
+PressureSensor::~PressureSensor() {
+ if (mEnabled) {
+ enable(0, 0);
+ }
+}
+
+int PressureSensor::setInitialState() {
+ struct input_absinfo absinfo;
+ if (!ioctl(data_fd, EVIOCGABS(EVENT_TYPE_PRESSURE), &absinfo)) {
+ // make sure to report an event immediately
+ mHasPendingEvent = true;
+ mPendingEvent.pressure = absinfo.value * PRESSURE_HECTO;
+ }
+ return 0;
+}
+
+int PressureSensor::enable(int32_t, int en) {
+ int flags = en ? 1 : 0;
+ if (flags != mEnabled) {
+ int fd;
+ strcpy(&input_sysfs_path[input_sysfs_path_len], "enable");
+ fd = open(input_sysfs_path, O_RDWR);
+ if (fd >= 0) {
+ char buf[2];
+ buf[1] = 0;
+ if (flags) {
+ buf[0] = '1';
+ } else {
+ buf[0] = '0';
+ }
+ write(fd, buf, sizeof(buf));
+ close(fd);
+ mEnabled = flags;
+ setInitialState();
+ return 0;
+ }
+ return -1;
+ }
+ return 0;
+}
+
+bool PressureSensor::hasPendingEvents() const {
+ return mHasPendingEvent;
+}
+
+int PressureSensor::readEvents(sensors_event_t* data, int count)
+{
+ if (count < 1)
+ return -EINVAL;
+
+ if (mHasPendingEvent) {
+ mHasPendingEvent = false;
+ mPendingEvent.timestamp = getTimestamp();
+ *data = mPendingEvent;
+ return mEnabled ? 1 : 0;
+ }
+
+ ssize_t n = mInputReader.fill(data_fd);
+ if (n < 0)
+ return n;
+
+ int numEventReceived = 0;
+ input_event const* event;
+
+ while (count && mInputReader.readEvent(&event)) {
+ int type = event->type;
+ if (type == EV_ABS) {
+ if (event->code == EVENT_TYPE_PRESSURE) {
+ mPendingEvent.pressure = event->value * PRESSURE_HECTO;
+ }
+ } else if (type == EV_SYN) {
+ mPendingEvent.timestamp = timevalToNano(event->time);
+ if (mEnabled) {
+ *data++ = mPendingEvent;
+ count--;
+ numEventReceived++;
+ }
+ } else {
+ LOGE("PressureSensor: unknown event (type=%d, code=%d)",
+ type, event->code);
+ }
+ mInputReader.next();
+ }
+
+ return numEventReceived;
+}