1 files changed, 152 insertions, 0 deletions
diff --git a/libsensors/LightSensor.cpp b/libsensors/LightSensor.cpp
new file mode 100644
index 0000000..405348f
--- /dev/null
+++ b/libsensors/LightSensor.cpp
@@ -0,0 +1,152 @@
+/*
+ * 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 <cstring>
+
+#include <cutils/log.h>
+
+#include "LightSensor.h"
+
+#define LOGTAG "LightSensor"
+
+// #define ALOG_NDEBUG 0
+
+/*****************************************************************************/
+
+LightSensor::LightSensor()
+    : SensorBase(NULL, "light_sensor"),
+    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));
+
+    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::setInitialState() {
+    struct input_absinfo absinfo;
+    if (!ioctl(data_fd, EVIOCGABS(EVENT_TYPE_LIGHT), &absinfo)) {
+        // make sure to report an event immediately
+        mHasPendingEvent = true;
+        mPendingEvent.light = absinfo.value;
+    }
+    return 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;
+    int err;
+    int fd;
+    if (flags != mEnabled) {
+        strcpy(&input_sysfs_path[input_sysfs_path_len], "enable");
+        fd = open(input_sysfs_path, O_RDWR);
+        if (fd >= 0) {
+            write(fd, en == 1 ? "1" : "0", 2);
+            close(fd);
+            mEnabled = flags;
+            setInitialState();
+            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_REL) {
+            if (event->code == EVENT_TYPE_LIGHT) {
+                mPendingEvent.light = event->value;
+            }
+        } else if (type == EV_SYN) {
+            mPendingEvent.timestamp = timevalToNano(event->time);
+            if (mEnabled) {
+                *data++ = mPendingEvent;
+                count--;
+                numEventReceived++;
+            }
+        } else {
+            ALOGE("%s: unknown event (type=%d, code=%d)", LOGTAG,
+                    type, event->code);
+        }
+        mInputReader.next();
+    }
+
+    return numEventReceived;
+}