| /* |
| * 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/max9635.h> |
| |
| #include <cutils/log.h> |
| |
| #include "LightSensor.h" |
| |
| /*****************************************************************************/ |
| |
| LightSensor::LightSensor() |
| : SensorBase(LIGHTING_DEVICE_NAME, "max9635_als"), |
| mEnabled(0), |
| mInputReader(4), |
| mHasPendingEvent(false) |
| { |
| mPendingEvent.version = sizeof(sensors_event_t); |
| mPendingEvent.sensor = ID_L; |
| mPendingEvent.type = SENSOR_TYPE_LIGHT; |
| memset(mPendingEvent.data, 0, sizeof(mPendingEvent.data)); |
| } |
| |
| LightSensor::~LightSensor() { |
| } |
| |
| int LightSensor::enable(int32_t, int en) { |
| int err; |
| en = en ? 1 : 0; |
| if(mEnabled != en) { |
| if (en) { |
| open_device(); |
| } |
| err = ioctl(dev_fd, MAX9635_IOCTL_SET_ENABLE,&en); |
| err = err<0 ? -errno : 0; |
| LOGE_IF(err, "MAX9635_IOCTL_SET_ENABLE failed (%s)", strerror(-err)); |
| if (!err) { |
| mEnabled = en; |
| } |
| if (!en) { |
| close_device(); |
| } |
| } |
| return 0; |
| } |
| |
| bool LightSensor::hasPendingEvents() const { |
| return mHasPendingEvent; |
| } |
| |
| int LightSensor::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_MSC) { |
| if (event->code == EVENT_TYPE_LIGHT) { |
| mPendingEvent.light = indexToValue(event->value); |
| } |
| } else if (type == EV_SYN) { |
| mPendingEvent.timestamp = timevalToNano(event->time); |
| if (mEnabled) { |
| *data++ = mPendingEvent; |
| count--; |
| numEventReceived++; |
| } |
| } else { |
| if (type == 4 && event->code == 3) { |
| // weird, not sure why we're getting this all the time |
| } else { |
| LOGE("LightSensor: unknown event (type=%d, code=%d)", |
| type, event->code); |
| } |
| } |
| mInputReader.next(); |
| } |
| |
| return numEventReceived; |
| } |
| |
| float LightSensor::indexToValue(size_t index) const |
| { |
| return float(index); |
| } |