From fd62ef4c2d6e912b0a9a5354e82560f515b0c20c Mon Sep 17 00:00:00 2001
From: Marty Fouts <mfouts@sta.samsung.com>
Date: Mon, 27 Jun 2011 22:40:40 -0700
Subject: tuna: sensors: add light, proximity, pressure sensors

NOTE:
	- light sensor ADC values need to be calibrated.

Change-Id: Iba75dc62a922bbcd0d1e273566f9089c4da450fb
Signed-off-by: Marty Fouts <mfouts@sta.samsung.com>
---
 libsensors/LightSensor.cpp | 68 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 libsensors/LightSensor.cpp

(limited to 'libsensors/LightSensor.cpp')

diff --git a/libsensors/LightSensor.cpp b/libsensors/LightSensor.cpp
new file mode 100644
index 0000000..067654f
--- /dev/null
+++ b/libsensors/LightSensor.cpp
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2011 Samsung
+ *
+ * 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 <pthread.h>
+
+#include "LightSensor.h"
+
+LightSensor::LightSensor()
+    : SamsungSensorBase(NULL, "lightsensor-level", ABS_MISC)
+{
+    mPendingEvent.sensor = ID_L;
+    mPendingEvent.type = SENSOR_TYPE_LIGHT;
+    mPreviousLight = -1;
+}
+
+bool LightSensor::handleEvent(input_event const *event) {
+    mPendingEvent.light = indexToValue(event->value);
+    if (mPendingEvent.light != mPreviousLight) {
+        mPreviousLight = mPendingEvent.light;
+        return true;
+    }
+    return false;
+}
+
+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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