From d2125537f5dc8b853f750b509bd1f12f616d2855 Mon Sep 17 00:00:00 2001
From: sbrissen <sbrissen@hotmail.com>
Date: Fri, 11 Oct 2013 07:51:46 -0400
Subject: opensource sensors

---
 libsensors/ProximitySensor.cpp | 144 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 libsensors/ProximitySensor.cpp

(limited to 'libsensors/ProximitySensor.cpp')

diff --git a/libsensors/ProximitySensor.cpp b/libsensors/ProximitySensor.cpp
new file mode 100644
index 0000000..2f3604c
--- /dev/null
+++ b/libsensors/ProximitySensor.cpp
@@ -0,0 +1,144 @@
+/*
+ * 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 "ProximitySensor.h"
+
+/*****************************************************************************/
+
+ProximitySensor::ProximitySensor()
+    : SensorBase(NULL, "proximity_sensor"),
+      mEnabled(0),
+      mInputReader(4),
+      mHasPendingEvent(false)
+{
+    mPendingEvent.version = sizeof(sensors_event_t);
+    mPendingEvent.sensor = ID_P;
+    mPendingEvent.type = SENSOR_TYPE_PROXIMITY;
+    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);
+    }
+}
+
+ProximitySensor::~ProximitySensor() {
+    if (mEnabled) {
+        enable(0, 0);
+    }
+}
+
+int ProximitySensor::setInitialState() {
+    struct input_absinfo absinfo;
+    if (!ioctl(data_fd, EVIOCGABS(EVENT_TYPE_PROXIMITY), &absinfo)) {
+        // make sure to report an event immediately
+        mHasPendingEvent = true;
+        mPendingEvent.distance = indexToValue(absinfo.value);
+    }
+    return 0;
+}
+
+int ProximitySensor::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 ProximitySensor::hasPendingEvents() const {
+    return mHasPendingEvent;
+}
+
+int ProximitySensor::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_PROXIMITY) {
+                if (event->value != -1) {
+                    // FIXME: not sure why we're getting -1 sometimes
+                    mPendingEvent.distance = indexToValue(event->value);
+                }
+            }
+        } else if (type == EV_SYN) {
+            mPendingEvent.timestamp = timevalToNano(event->time);
+            if (mEnabled) {
+                *data++ = mPendingEvent;
+                count--;
+                numEventReceived++;
+            }
+        } else {
+            ALOGE("ProximitySensor: unknown event (type=%d, code=%d)",
+                    type, event->code);
+        }
+        mInputReader.next();
+    }
+
+    return numEventReceived;
+}
+
+float ProximitySensor::indexToValue(size_t index) const
+{
+    return index * PROXIMITY_THRESHOLD_GP2A;
+}
-- 
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