| /* |
| * Copyright (C) 2010 Motorola, Inc. |
| * 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 <linux/bmp085.h> |
| |
| #include <cutils/log.h> |
| |
| #include "PressureSensor.h" |
| |
| /*****************************************************************************/ |
| |
| PressureSensor::PressureSensor() |
| : SensorBase(BAROMETER_DEVICE_NAME, "barometer"), |
| mEnabled(0), |
| mInputReader(32) |
| { |
| mPendingEvent.version = sizeof(sensors_event_t); |
| mPendingEvent.sensor = ID_B; |
| mPendingEvent.type = SENSOR_TYPE_PRESSURE; |
| memset(mPendingEvent.data, 0x00, sizeof(mPendingEvent.data)); |
| |
| open_device(); |
| |
| // read the actual value of all sensors if they're enabled already |
| struct input_absinfo absinfo; |
| int flags = 0; |
| if (!ioctl(dev_fd, BMP085_IOCTL_GET_ENABLE, &flags)) { |
| if (flags) { |
| mEnabled = 1; |
| if (!ioctl(data_fd, EVIOCGABS(EVENT_TYPE_PRESSURE), &absinfo)) { |
| mPendingEvent.pressure = absinfo.value * CONVERT_B; |
| } |
| } |
| } |
| if (!mEnabled) { |
| close_device(); |
| } |
| } |
| |
| PressureSensor::~PressureSensor() { |
| } |
| |
| int PressureSensor::enable(int32_t, int en) |
| { |
| int flags = en ? 1 : 0; |
| int err = 0; |
| if (flags != mEnabled) { |
| if (flags) { |
| open_device(); |
| } |
| err = ioctl(dev_fd, BMP085_IOCTL_SET_ENABLE, &flags); |
| err = err<0 ? -errno : 0; |
| LOGE_IF(err, "BMP085_IOCTL_SET_ENABLE failed (%s)", strerror(-err)); |
| if (!err) { |
| mEnabled = flags; |
| } |
| if (!flags) { |
| close_device(); |
| } |
| } |
| return err; |
| } |
| |
| int PressureSensor::setDelay(int32_t handle, int64_t ns) |
| { |
| if (ns < 0) |
| return -EINVAL; |
| |
| int delay = ns / 1000000; |
| if (ioctl(dev_fd, BMP085_IOCTL_SET_DELAY, &delay)) { |
| return -errno; |
| } |
| return 0; |
| } |
| |
| int PressureSensor::readEvents(sensors_event_t* data, int count) |
| { |
| if (count < 1) |
| return -EINVAL; |
| |
| 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) { |
| processEvent(event->code, event->value); |
| } else if (type == EV_SYN) { |
| int64_t time = timevalToNano(event->time); |
| mPendingEvent.timestamp = time; |
| if (mEnabled) { |
| *data++ = mPendingEvent; |
| count--; |
| numEventReceived++; |
| } |
| } else { |
| LOGE("PressureSensor: unknown event (type=%d, code=%d)", |
| type, event->code); |
| } |
| mInputReader.next(); |
| } |
| |
| return numEventReceived; |
| } |
| |
| void PressureSensor::processEvent(int code, int value) |
| { |
| if (code == EVENT_TYPE_PRESSURE) { |
| mPendingEvent.pressure = value * CONVERT_B; |
| } |
| } |