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| author | atinm <atin.malaviya@gmail.com> | 2011-05-17 11:12:26 -0400 |
|---|---|---|
| committer | atinm <atin.malaviya@gmail.com> | 2011-05-17 11:12:26 -0400 |
| commit | 93a7e5951c8dfcdf609161875493ef6925f68ca7 (patch) | |
| tree | 4f6a18bc3d66a41021e627412a54bb80567264c3 /libsensors/LightSensor.cpp | |
| parent | 306e030c5772b1cd1d38a4801db2bc128021003a (diff) | |
| download | device_samsung_aries-common-93a7e5951c8dfcdf609161875493ef6925f68ca7.zip device_samsung_aries-common-93a7e5951c8dfcdf609161875493ef6925f68ca7.tar.gz device_samsung_aries-common-93a7e5951c8dfcdf609161875493ef6925f68ca7.tar.bz2 | |
moved to device/samsung/aries-common
Diffstat (limited to 'libsensors/LightSensor.cpp')
| -rw-r--r-- | libsensors/LightSensor.cpp | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/libsensors/LightSensor.cpp b/libsensors/LightSensor.cpp new file mode 100644 index 0000000..ea3e250 --- /dev/null +++ b/libsensors/LightSensor.cpp @@ -0,0 +1,180 @@ +/*
+ * 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 "LightSensor.h"
+
+/*****************************************************************************/
+
+/* The Crespo ADC sends 4 somewhat bogus events after enabling the sensor.
+ This becomes a problem if the phone is turned off in bright light
+ and turned back on in the dark.
+ To avoid this we ignore the first 4 events received after enabling the sensor.
+ */
+#define FIRST_GOOD_EVENT 5
+
+LightSensor::LightSensor()
+ : SensorBase(NULL, "light_sensor"),
+ mEnabled(0),
+ mEventsSinceEnable(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));
+
+ 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);
+ }
+}
+
+LightSensor::~LightSensor() {
+ if (mEnabled) {
+ enable(0, 0);
+ }
+}
+
+int LightSensor::setDelay(int32_t handle, int64_t ns)
+{
+ int fd;
+ strcpy(&input_sysfs_path[input_sysfs_path_len], "poll_delay");
+ fd = open(input_sysfs_path, O_RDWR);
+ if (fd >= 0) {
+ char buf[80];
+ sprintf(buf, "%lld", ns);
+ write(fd, buf, strlen(buf)+1);
+ close(fd);
+ return 0;
+ }
+ return -1;
+}
+
+int LightSensor::enable(int32_t handle, int en)
+{
+ int flags = en ? 1 : 0;
+ mEventsSinceEnable = 0;
+ mPreviousLight = -1;
+ 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];
+ int err;
+ buf[1] = 0;
+ if (flags) {
+ buf[0] = '1';
+ } else {
+ buf[0] = '0';
+ }
+ err = write(fd, buf, sizeof(buf));
+ close(fd);
+ mEnabled = flags;
+ return 0;
+ }
+ return -1;
+ }
+ 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_ABS) {
+ if (event->code == EVENT_TYPE_LIGHT) {
+ mPendingEvent.light = indexToValue(event->value);
+ if (mEventsSinceEnable < FIRST_GOOD_EVENT)
+ mEventsSinceEnable++;
+ }
+ } else if (type == EV_SYN) {
+ mPendingEvent.timestamp = timevalToNano(event->time);
+ if (mEnabled && (mPendingEvent.light != mPreviousLight) &&
+ mEventsSinceEnable >= FIRST_GOOD_EVENT) {
+ *data++ = mPendingEvent;
+ count--;
+ numEventReceived++;
+ mPreviousLight = mPendingEvent.light;
+ }
+ } else {
+ LOGE("LightSensor: unknown event (type=%d, code=%d)",
+ type, event->code);
+ }
+ mInputReader.next();
+ }
+
+ return numEventReceived;
+}
+
+float LightSensor::indexToValue(size_t index) const
+{
+ /* Driver gives a rolling average adc value. We convert it lux levels. */
+ static const struct adcToLux {
+ size_t adc_value;
+ float lux_value;
+ } adcToLux[] = {
+ { 150, 10.0 }, /* from 0 - 150 adc, we map to 10.0 lux */
+ { 800, 160.0 }, /* from 151 - 800 adc, we map to 160.0 lux */
+ { 900, 225.0 }, /* from 801 - 900 adc, we map to 225.0 lux */
+ { 1000, 320.0 }, /* from 901 - 1000 adc, we map to 320.0 lux */
+ { 1200, 640.0 }, /* from 1001 - 1200 adc, we map to 640.0 lux */
+ { 1400, 1280.0 }, /* from 1201 - 1400 adc, we map to 1280.0 lux */
+ { 1600, 2600.0 }, /* from 1401 - 1600 adc, we map to 2600.0 lux */
+ { 4095, 10240.0 }, /* from 1601 - 4095 adc, we map to 10240.0 lux */
+ };
+ size_t i;
+ for (i = 0; i < ARRAY_SIZE(adcToLux); i++) {
+ if (index < adcToLux[i].adc_value) {
+ return adcToLux[i].lux_value;
+ }
+ }
+ return adcToLux[ARRAY_SIZE(adcToLux)-1].lux_value;
+}
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